28cd9b1fc703cb8b2a3d470dd76aa3e3.json
2.66 MB
{"ast":null,"code":"/* build: `node build.js modules=ALL exclude=gestures,accessors requirejs minifier=uglifyjs` */\n\n/*! Fabric.js Copyright 2008-2015, Printio (Juriy Zaytsev, Maxim Chernyak) */\nvar fabric = fabric || {\n version: '4.2.0'\n};\n\nif (typeof exports !== 'undefined') {\n exports.fabric = fabric;\n}\n/* _AMD_START_ */\nelse if (typeof define === 'function' && define.amd) {\n define([], function () {\n return fabric;\n });\n }\n/* _AMD_END_ */\n\n\nif (typeof document !== 'undefined' && typeof window !== 'undefined') {\n if (document instanceof (typeof HTMLDocument !== 'undefined' ? HTMLDocument : Document)) {\n fabric.document = document;\n } else {\n fabric.document = document.implementation.createHTMLDocument('');\n }\n\n fabric.window = window;\n} else {\n // assume we're running under node.js when document/window are not present\n var jsdom = require('jsdom');\n\n var virtualWindow = new jsdom.JSDOM(decodeURIComponent('%3C!DOCTYPE%20html%3E%3Chtml%3E%3Chead%3E%3C%2Fhead%3E%3Cbody%3E%3C%2Fbody%3E%3C%2Fhtml%3E'), {\n features: {\n FetchExternalResources: ['img']\n },\n resources: 'usable'\n }).window;\n fabric.document = virtualWindow.document;\n fabric.jsdomImplForWrapper = require('jsdom/lib/jsdom/living/generated/utils').implForWrapper;\n fabric.nodeCanvas = require('jsdom/lib/jsdom/utils').Canvas;\n fabric.window = virtualWindow;\n DOMParser = fabric.window.DOMParser;\n}\n/**\n * True when in environment that supports touch events\n * @type boolean\n */\n\n\nfabric.isTouchSupported = 'ontouchstart' in fabric.window || 'ontouchstart' in fabric.document || fabric.window && fabric.window.navigator && fabric.window.navigator.maxTouchPoints > 0;\n/**\n * True when in environment that's probably Node.js\n * @type boolean\n */\n\nfabric.isLikelyNode = typeof Buffer !== 'undefined' && typeof window === 'undefined';\n/* _FROM_SVG_START_ */\n\n/**\n * Attributes parsed from all SVG elements\n * @type array\n */\n\nfabric.SHARED_ATTRIBUTES = ['display', 'transform', 'fill', 'fill-opacity', 'fill-rule', 'opacity', 'stroke', 'stroke-dasharray', 'stroke-linecap', 'stroke-dashoffset', 'stroke-linejoin', 'stroke-miterlimit', 'stroke-opacity', 'stroke-width', 'id', 'paint-order', 'vector-effect', 'instantiated_by_use', 'clip-path'];\n/* _FROM_SVG_END_ */\n\n/**\n * Pixel per Inch as a default value set to 96. Can be changed for more realistic conversion.\n */\n\nfabric.DPI = 96;\nfabric.reNum = '(?:[-+]?(?:\\\\d+|\\\\d*\\\\.\\\\d+)(?:[eE][-+]?\\\\d+)?)';\nfabric.commaWsp = '(?:\\\\s+,?\\\\s*|,\\\\s*)';\nfabric.rePathCommand = /([-+]?((\\d+\\.\\d+)|((\\d+)|(\\.\\d+)))(?:[eE][-+]?\\d+)?)/ig;\nfabric.reNonWord = /[ \\n\\.,;!\\?\\-]/;\nfabric.fontPaths = {};\nfabric.iMatrix = [1, 0, 0, 1, 0, 0];\nfabric.svgNS = 'http://www.w3.org/2000/svg';\n/**\n * Pixel limit for cache canvases. 1Mpx , 4Mpx should be fine.\n * @since 1.7.14\n * @type Number\n * @default\n */\n\nfabric.perfLimitSizeTotal = 2097152;\n/**\n * Pixel limit for cache canvases width or height. IE fixes the maximum at 5000\n * @since 1.7.14\n * @type Number\n * @default\n */\n\nfabric.maxCacheSideLimit = 4096;\n/**\n * Lowest pixel limit for cache canvases, set at 256PX\n * @since 1.7.14\n * @type Number\n * @default\n */\n\nfabric.minCacheSideLimit = 256;\n/**\n * Cache Object for widths of chars in text rendering.\n */\n\nfabric.charWidthsCache = {};\n/**\n * if webgl is enabled and available, textureSize will determine the size\n * of the canvas backend\n * @since 2.0.0\n * @type Number\n * @default\n */\n\nfabric.textureSize = 2048;\n/**\n * When 'true', style information is not retained when copy/pasting text, making\n * pasted text use destination style.\n * Defaults to 'false'.\n * @type Boolean\n * @default\n */\n\nfabric.disableStyleCopyPaste = false;\n/**\n * Enable webgl for filtering picture is available\n * A filtering backend will be initialized, this will both take memory and\n * time since a default 2048x2048 canvas will be created for the gl context\n * @since 2.0.0\n * @type Boolean\n * @default\n */\n\nfabric.enableGLFiltering = true;\n/**\n * Device Pixel Ratio\n * @see https://developer.apple.com/library/safari/documentation/AudioVideo/Conceptual/HTML-canvas-guide/SettingUptheCanvas/SettingUptheCanvas.html\n */\n\nfabric.devicePixelRatio = fabric.window.devicePixelRatio || fabric.window.webkitDevicePixelRatio || fabric.window.mozDevicePixelRatio || 1;\n/**\n * Browser-specific constant to adjust CanvasRenderingContext2D.shadowBlur value,\n * which is unitless and not rendered equally across browsers.\n *\n * Values that work quite well (as of October 2017) are:\n * - Chrome: 1.5\n * - Edge: 1.75\n * - Firefox: 0.9\n * - Safari: 0.95\n *\n * @since 2.0.0\n * @type Number\n * @default 1\n */\n\nfabric.browserShadowBlurConstant = 1;\n/**\n * This object contains the result of arc to beizer conversion for faster retrieving if the same arc needs to be converted again.\n * It was an internal variable, is accessible since version 2.3.4\n */\n\nfabric.arcToSegmentsCache = {};\n/**\n * This object keeps the results of the boundsOfCurve calculation mapped by the joined arguments necessary to calculate it.\n * It does speed up calculation, if you parse and add always the same paths, but in case of heavy usage of freedrawing\n * you do not get any speed benefit and you get a big object in memory.\n * The object was a private variable before, while now is appended to the lib so that you have access to it and you\n * can eventually clear it.\n * It was an internal variable, is accessible since version 2.3.4\n */\n\nfabric.boundsOfCurveCache = {};\n/**\n * If disabled boundsOfCurveCache is not used. For apps that make heavy usage of pencil drawing probably disabling it is better\n * @default true\n */\n\nfabric.cachesBoundsOfCurve = true;\n/**\n * Skip performance testing of setupGLContext and force the use of putImageData that seems to be the one that works best on\n * Chrome + old hardware. if your users are experiencing empty images after filtering you may try to force this to true\n * this has to be set before instantiating the filtering backend ( before filtering the first image )\n * @type Boolean\n * @default false\n */\n\nfabric.forceGLPutImageData = false;\n\nfabric.initFilterBackend = function () {\n if (fabric.enableGLFiltering && fabric.isWebglSupported && fabric.isWebglSupported(fabric.textureSize)) {\n console.log('max texture size: ' + fabric.maxTextureSize);\n return new fabric.WebglFilterBackend({\n tileSize: fabric.textureSize\n });\n } else if (fabric.Canvas2dFilterBackend) {\n return new fabric.Canvas2dFilterBackend();\n }\n};\n\nif (typeof document !== 'undefined' && typeof window !== 'undefined') {\n // ensure globality even if entire library were function wrapped (as in Meteor.js packaging system)\n window.fabric = fabric;\n}\n\n(function () {\n /**\n * @private\n * @param {String} eventName\n * @param {Function} handler\n */\n function _removeEventListener(eventName, handler) {\n if (!this.__eventListeners[eventName]) {\n return;\n }\n\n var eventListener = this.__eventListeners[eventName];\n\n if (handler) {\n eventListener[eventListener.indexOf(handler)] = false;\n } else {\n fabric.util.array.fill(eventListener, false);\n }\n }\n /**\n * Observes specified event\n * @memberOf fabric.Observable\n * @alias on\n * @param {String|Object} eventName Event name (eg. 'after:render') or object with key/value pairs (eg. {'after:render': handler, 'selection:cleared': handler})\n * @param {Function} handler Function that receives a notification when an event of the specified type occurs\n * @return {Self} thisArg\n * @chainable\n */\n\n\n function on(eventName, handler) {\n if (!this.__eventListeners) {\n this.__eventListeners = {};\n } // one object with key/value pairs was passed\n\n\n if (arguments.length === 1) {\n for (var prop in eventName) {\n this.on(prop, eventName[prop]);\n }\n } else {\n if (!this.__eventListeners[eventName]) {\n this.__eventListeners[eventName] = [];\n }\n\n this.__eventListeners[eventName].push(handler);\n }\n\n return this;\n }\n /**\n * Stops event observing for a particular event handler. Calling this method\n * without arguments removes all handlers for all events\n * @memberOf fabric.Observable\n * @alias off\n * @param {String|Object} eventName Event name (eg. 'after:render') or object with key/value pairs (eg. {'after:render': handler, 'selection:cleared': handler})\n * @param {Function} handler Function to be deleted from EventListeners\n * @return {Self} thisArg\n * @chainable\n */\n\n\n function off(eventName, handler) {\n if (!this.__eventListeners) {\n return this;\n } // remove all key/value pairs (event name -> event handler)\n\n\n if (arguments.length === 0) {\n for (eventName in this.__eventListeners) {\n _removeEventListener.call(this, eventName);\n }\n } // one object with key/value pairs was passed\n else if (arguments.length === 1 && typeof arguments[0] === 'object') {\n for (var prop in eventName) {\n _removeEventListener.call(this, prop, eventName[prop]);\n }\n } else {\n _removeEventListener.call(this, eventName, handler);\n }\n\n return this;\n }\n /**\n * Fires event with an optional options object\n * @memberOf fabric.Observable\n * @param {String} eventName Event name to fire\n * @param {Object} [options] Options object\n * @return {Self} thisArg\n * @chainable\n */\n\n\n function fire(eventName, options) {\n if (!this.__eventListeners) {\n return this;\n }\n\n var listenersForEvent = this.__eventListeners[eventName];\n\n if (!listenersForEvent) {\n return this;\n }\n\n for (var i = 0, len = listenersForEvent.length; i < len; i++) {\n listenersForEvent[i] && listenersForEvent[i].call(this, options || {});\n }\n\n this.__eventListeners[eventName] = listenersForEvent.filter(function (value) {\n return value !== false;\n });\n return this;\n }\n /**\n * @namespace fabric.Observable\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-2#events}\n * @see {@link http://fabricjs.com/events|Events demo}\n */\n\n\n fabric.Observable = {\n fire: fire,\n on: on,\n off: off\n };\n})();\n/**\n * @namespace fabric.Collection\n */\n\n\nfabric.Collection = {\n _objects: [],\n\n /**\n * Adds objects to collection, Canvas or Group, then renders canvas\n * (if `renderOnAddRemove` is not `false`).\n * in case of Group no changes to bounding box are made.\n * Objects should be instances of (or inherit from) fabric.Object\n * Use of this function is highly discouraged for groups.\n * you can add a bunch of objects with the add method but then you NEED\n * to run a addWithUpdate call for the Group class or position/bbox will be wrong.\n * @param {...fabric.Object} object Zero or more fabric instances\n * @return {Self} thisArg\n * @chainable\n */\n add: function () {\n this._objects.push.apply(this._objects, arguments);\n\n if (this._onObjectAdded) {\n for (var i = 0, length = arguments.length; i < length; i++) {\n this._onObjectAdded(arguments[i]);\n }\n }\n\n this.renderOnAddRemove && this.requestRenderAll();\n return this;\n },\n\n /**\n * Inserts an object into collection at specified index, then renders canvas (if `renderOnAddRemove` is not `false`)\n * An object should be an instance of (or inherit from) fabric.Object\n * Use of this function is highly discouraged for groups.\n * you can add a bunch of objects with the insertAt method but then you NEED\n * to run a addWithUpdate call for the Group class or position/bbox will be wrong.\n * @param {Object} object Object to insert\n * @param {Number} index Index to insert object at\n * @param {Boolean} nonSplicing When `true`, no splicing (shifting) of objects occurs\n * @return {Self} thisArg\n * @chainable\n */\n insertAt: function (object, index, nonSplicing) {\n var objects = this._objects;\n\n if (nonSplicing) {\n objects[index] = object;\n } else {\n objects.splice(index, 0, object);\n }\n\n this._onObjectAdded && this._onObjectAdded(object);\n this.renderOnAddRemove && this.requestRenderAll();\n return this;\n },\n\n /**\n * Removes objects from a collection, then renders canvas (if `renderOnAddRemove` is not `false`)\n * @param {...fabric.Object} object Zero or more fabric instances\n * @return {Self} thisArg\n * @chainable\n */\n remove: function () {\n var objects = this._objects,\n index,\n somethingRemoved = false;\n\n for (var i = 0, length = arguments.length; i < length; i++) {\n index = objects.indexOf(arguments[i]); // only call onObjectRemoved if an object was actually removed\n\n if (index !== -1) {\n somethingRemoved = true;\n objects.splice(index, 1);\n this._onObjectRemoved && this._onObjectRemoved(arguments[i]);\n }\n }\n\n this.renderOnAddRemove && somethingRemoved && this.requestRenderAll();\n return this;\n },\n\n /**\n * Executes given function for each object in this group\n * @param {Function} callback\n * Callback invoked with current object as first argument,\n * index - as second and an array of all objects - as third.\n * Callback is invoked in a context of Global Object (e.g. `window`)\n * when no `context` argument is given\n *\n * @param {Object} context Context (aka thisObject)\n * @return {Self} thisArg\n * @chainable\n */\n forEachObject: function (callback, context) {\n var objects = this.getObjects();\n\n for (var i = 0, len = objects.length; i < len; i++) {\n callback.call(context, objects[i], i, objects);\n }\n\n return this;\n },\n\n /**\n * Returns an array of children objects of this instance\n * Type parameter introduced in 1.3.10\n * since 2.3.5 this method return always a COPY of the array;\n * @param {String} [type] When specified, only objects of this type are returned\n * @return {Array}\n */\n getObjects: function (type) {\n if (typeof type === 'undefined') {\n return this._objects.concat();\n }\n\n return this._objects.filter(function (o) {\n return o.type === type;\n });\n },\n\n /**\n * Returns object at specified index\n * @param {Number} index\n * @return {Self} thisArg\n */\n item: function (index) {\n return this._objects[index];\n },\n\n /**\n * Returns true if collection contains no objects\n * @return {Boolean} true if collection is empty\n */\n isEmpty: function () {\n return this._objects.length === 0;\n },\n\n /**\n * Returns a size of a collection (i.e: length of an array containing its objects)\n * @return {Number} Collection size\n */\n size: function () {\n return this._objects.length;\n },\n\n /**\n * Returns true if collection contains an object\n * @param {Object} object Object to check against\n * @return {Boolean} `true` if collection contains an object\n */\n contains: function (object) {\n return this._objects.indexOf(object) > -1;\n },\n\n /**\n * Returns number representation of a collection complexity\n * @return {Number} complexity\n */\n complexity: function () {\n return this._objects.reduce(function (memo, current) {\n memo += current.complexity ? current.complexity() : 0;\n return memo;\n }, 0);\n }\n};\n/**\n * @namespace fabric.CommonMethods\n */\n\nfabric.CommonMethods = {\n /**\n * Sets object's properties from options\n * @param {Object} [options] Options object\n */\n _setOptions: function (options) {\n for (var prop in options) {\n this.set(prop, options[prop]);\n }\n },\n\n /**\n * @private\n * @param {Object} [filler] Options object\n * @param {String} [property] property to set the Gradient to\n */\n _initGradient: function (filler, property) {\n if (filler && filler.colorStops && !(filler instanceof fabric.Gradient)) {\n this.set(property, new fabric.Gradient(filler));\n }\n },\n\n /**\n * @private\n * @param {Object} [filler] Options object\n * @param {String} [property] property to set the Pattern to\n * @param {Function} [callback] callback to invoke after pattern load\n */\n _initPattern: function (filler, property, callback) {\n if (filler && filler.source && !(filler instanceof fabric.Pattern)) {\n this.set(property, new fabric.Pattern(filler, callback));\n } else {\n callback && callback();\n }\n },\n\n /**\n * @private\n */\n _setObject: function (obj) {\n for (var prop in obj) {\n this._set(prop, obj[prop]);\n }\n },\n\n /**\n * Sets property to a given value. When changing position/dimension -related properties (left, top, scale, angle, etc.) `set` does not update position of object's borders/controls. If you need to update those, call `setCoords()`.\n * @param {String|Object} key Property name or object (if object, iterate over the object properties)\n * @param {Object|Function} value Property value (if function, the value is passed into it and its return value is used as a new one)\n * @return {fabric.Object} thisArg\n * @chainable\n */\n set: function (key, value) {\n if (typeof key === 'object') {\n this._setObject(key);\n } else {\n this._set(key, value);\n }\n\n return this;\n },\n _set: function (key, value) {\n this[key] = value;\n },\n\n /**\n * Toggles specified property from `true` to `false` or from `false` to `true`\n * @param {String} property Property to toggle\n * @return {fabric.Object} thisArg\n * @chainable\n */\n toggle: function (property) {\n var value = this.get(property);\n\n if (typeof value === 'boolean') {\n this.set(property, !value);\n }\n\n return this;\n },\n\n /**\n * Basic getter\n * @param {String} property Property name\n * @return {*} value of a property\n */\n get: function (property) {\n return this[property];\n }\n};\n\n(function (global) {\n var sqrt = Math.sqrt,\n atan2 = Math.atan2,\n pow = Math.pow,\n PiBy180 = Math.PI / 180,\n PiBy2 = Math.PI / 2;\n /**\n * @namespace fabric.util\n */\n\n fabric.util = {\n /**\n * Calculate the cos of an angle, avoiding returning floats for known results\n * @static\n * @memberOf fabric.util\n * @param {Number} angle the angle in radians or in degree\n * @return {Number}\n */\n cos: function (angle) {\n if (angle === 0) {\n return 1;\n }\n\n if (angle < 0) {\n // cos(a) = cos(-a)\n angle = -angle;\n }\n\n var angleSlice = angle / PiBy2;\n\n switch (angleSlice) {\n case 1:\n case 3:\n return 0;\n\n case 2:\n return -1;\n }\n\n return Math.cos(angle);\n },\n\n /**\n * Calculate the sin of an angle, avoiding returning floats for known results\n * @static\n * @memberOf fabric.util\n * @param {Number} angle the angle in radians or in degree\n * @return {Number}\n */\n sin: function (angle) {\n if (angle === 0) {\n return 0;\n }\n\n var angleSlice = angle / PiBy2,\n sign = 1;\n\n if (angle < 0) {\n // sin(-a) = -sin(a)\n sign = -1;\n }\n\n switch (angleSlice) {\n case 1:\n return sign;\n\n case 2:\n return 0;\n\n case 3:\n return -sign;\n }\n\n return Math.sin(angle);\n },\n\n /**\n * Removes value from an array.\n * Presence of value (and its position in an array) is determined via `Array.prototype.indexOf`\n * @static\n * @memberOf fabric.util\n * @param {Array} array\n * @param {*} value\n * @return {Array} original array\n */\n removeFromArray: function (array, value) {\n var idx = array.indexOf(value);\n\n if (idx !== -1) {\n array.splice(idx, 1);\n }\n\n return array;\n },\n\n /**\n * Returns random number between 2 specified ones.\n * @static\n * @memberOf fabric.util\n * @param {Number} min lower limit\n * @param {Number} max upper limit\n * @return {Number} random value (between min and max)\n */\n getRandomInt: function (min, max) {\n return Math.floor(Math.random() * (max - min + 1)) + min;\n },\n\n /**\n * Transforms degrees to radians.\n * @static\n * @memberOf fabric.util\n * @param {Number} degrees value in degrees\n * @return {Number} value in radians\n */\n degreesToRadians: function (degrees) {\n return degrees * PiBy180;\n },\n\n /**\n * Transforms radians to degrees.\n * @static\n * @memberOf fabric.util\n * @param {Number} radians value in radians\n * @return {Number} value in degrees\n */\n radiansToDegrees: function (radians) {\n return radians / PiBy180;\n },\n\n /**\n * Rotates `point` around `origin` with `radians`\n * @static\n * @memberOf fabric.util\n * @param {fabric.Point} point The point to rotate\n * @param {fabric.Point} origin The origin of the rotation\n * @param {Number} radians The radians of the angle for the rotation\n * @return {fabric.Point} The new rotated point\n */\n rotatePoint: function (point, origin, radians) {\n point.subtractEquals(origin);\n var v = fabric.util.rotateVector(point, radians);\n return new fabric.Point(v.x, v.y).addEquals(origin);\n },\n\n /**\n * Rotates `vector` with `radians`\n * @static\n * @memberOf fabric.util\n * @param {Object} vector The vector to rotate (x and y)\n * @param {Number} radians The radians of the angle for the rotation\n * @return {Object} The new rotated point\n */\n rotateVector: function (vector, radians) {\n var sin = fabric.util.sin(radians),\n cos = fabric.util.cos(radians),\n rx = vector.x * cos - vector.y * sin,\n ry = vector.x * sin + vector.y * cos;\n return {\n x: rx,\n y: ry\n };\n },\n\n /**\n * Apply transform t to point p\n * @static\n * @memberOf fabric.util\n * @param {fabric.Point} p The point to transform\n * @param {Array} t The transform\n * @param {Boolean} [ignoreOffset] Indicates that the offset should not be applied\n * @return {fabric.Point} The transformed point\n */\n transformPoint: function (p, t, ignoreOffset) {\n if (ignoreOffset) {\n return new fabric.Point(t[0] * p.x + t[2] * p.y, t[1] * p.x + t[3] * p.y);\n }\n\n return new fabric.Point(t[0] * p.x + t[2] * p.y + t[4], t[1] * p.x + t[3] * p.y + t[5]);\n },\n\n /**\n * Returns coordinates of points's bounding rectangle (left, top, width, height)\n * @param {Array} points 4 points array\n * @param {Array} [transform] an array of 6 numbers representing a 2x3 transform matrix\n * @return {Object} Object with left, top, width, height properties\n */\n makeBoundingBoxFromPoints: function (points, transform) {\n if (transform) {\n for (var i = 0; i < points.length; i++) {\n points[i] = fabric.util.transformPoint(points[i], transform);\n }\n }\n\n var xPoints = [points[0].x, points[1].x, points[2].x, points[3].x],\n minX = fabric.util.array.min(xPoints),\n maxX = fabric.util.array.max(xPoints),\n width = maxX - minX,\n yPoints = [points[0].y, points[1].y, points[2].y, points[3].y],\n minY = fabric.util.array.min(yPoints),\n maxY = fabric.util.array.max(yPoints),\n height = maxY - minY;\n return {\n left: minX,\n top: minY,\n width: width,\n height: height\n };\n },\n\n /**\n * Invert transformation t\n * @static\n * @memberOf fabric.util\n * @param {Array} t The transform\n * @return {Array} The inverted transform\n */\n invertTransform: function (t) {\n var a = 1 / (t[0] * t[3] - t[1] * t[2]),\n r = [a * t[3], -a * t[1], -a * t[2], a * t[0]],\n o = fabric.util.transformPoint({\n x: t[4],\n y: t[5]\n }, r, true);\n r[4] = -o.x;\n r[5] = -o.y;\n return r;\n },\n\n /**\n * A wrapper around Number#toFixed, which contrary to native method returns number, not string.\n * @static\n * @memberOf fabric.util\n * @param {Number|String} number number to operate on\n * @param {Number} fractionDigits number of fraction digits to \"leave\"\n * @return {Number}\n */\n toFixed: function (number, fractionDigits) {\n return parseFloat(Number(number).toFixed(fractionDigits));\n },\n\n /**\n * Converts from attribute value to pixel value if applicable.\n * Returns converted pixels or original value not converted.\n * @param {Number|String} value number to operate on\n * @param {Number} fontSize\n * @return {Number|String}\n */\n parseUnit: function (value, fontSize) {\n var unit = /\\D{0,2}$/.exec(value),\n number = parseFloat(value);\n\n if (!fontSize) {\n fontSize = fabric.Text.DEFAULT_SVG_FONT_SIZE;\n }\n\n switch (unit[0]) {\n case 'mm':\n return number * fabric.DPI / 25.4;\n\n case 'cm':\n return number * fabric.DPI / 2.54;\n\n case 'in':\n return number * fabric.DPI;\n\n case 'pt':\n return number * fabric.DPI / 72;\n // or * 4 / 3\n\n case 'pc':\n return number * fabric.DPI / 72 * 12;\n // or * 16\n\n case 'em':\n return number * fontSize;\n\n default:\n return number;\n }\n },\n\n /**\n * Function which always returns `false`.\n * @static\n * @memberOf fabric.util\n * @return {Boolean}\n */\n falseFunction: function () {\n return false;\n },\n\n /**\n * Returns klass \"Class\" object of given namespace\n * @memberOf fabric.util\n * @param {String} type Type of object (eg. 'circle')\n * @param {String} namespace Namespace to get klass \"Class\" object from\n * @return {Object} klass \"Class\"\n */\n getKlass: function (type, namespace) {\n // capitalize first letter only\n type = fabric.util.string.camelize(type.charAt(0).toUpperCase() + type.slice(1));\n return fabric.util.resolveNamespace(namespace)[type];\n },\n\n /**\n * Returns array of attributes for given svg that fabric parses\n * @memberOf fabric.util\n * @param {String} type Type of svg element (eg. 'circle')\n * @return {Array} string names of supported attributes\n */\n getSvgAttributes: function (type) {\n var attributes = ['instantiated_by_use', 'style', 'id', 'class'];\n\n switch (type) {\n case 'linearGradient':\n attributes = attributes.concat(['x1', 'y1', 'x2', 'y2', 'gradientUnits', 'gradientTransform']);\n break;\n\n case 'radialGradient':\n attributes = attributes.concat(['gradientUnits', 'gradientTransform', 'cx', 'cy', 'r', 'fx', 'fy', 'fr']);\n break;\n\n case 'stop':\n attributes = attributes.concat(['offset', 'stop-color', 'stop-opacity']);\n break;\n }\n\n return attributes;\n },\n\n /**\n * Returns object of given namespace\n * @memberOf fabric.util\n * @param {String} namespace Namespace string e.g. 'fabric.Image.filter' or 'fabric'\n * @return {Object} Object for given namespace (default fabric)\n */\n resolveNamespace: function (namespace) {\n if (!namespace) {\n return fabric;\n }\n\n var parts = namespace.split('.'),\n len = parts.length,\n i,\n obj = global || fabric.window;\n\n for (i = 0; i < len; ++i) {\n obj = obj[parts[i]];\n }\n\n return obj;\n },\n\n /**\n * Loads image element from given url and passes it to a callback\n * @memberOf fabric.util\n * @param {String} url URL representing an image\n * @param {Function} callback Callback; invoked with loaded image\n * @param {*} [context] Context to invoke callback in\n * @param {Object} [crossOrigin] crossOrigin value to set image element to\n */\n loadImage: function (url, callback, context, crossOrigin) {\n if (!url) {\n callback && callback.call(context, url);\n return;\n }\n\n var img = fabric.util.createImage();\n /** @ignore */\n\n var onLoadCallback = function () {\n callback && callback.call(context, img, false);\n img = img.onload = img.onerror = null;\n };\n\n img.onload = onLoadCallback;\n /** @ignore */\n\n img.onerror = function () {\n fabric.log('Error loading ' + img.src);\n callback && callback.call(context, null, true);\n img = img.onload = img.onerror = null;\n }; // data-urls appear to be buggy with crossOrigin\n // https://github.com/kangax/fabric.js/commit/d0abb90f1cd5c5ef9d2a94d3fb21a22330da3e0a#commitcomment-4513767\n // see https://code.google.com/p/chromium/issues/detail?id=315152\n // https://bugzilla.mozilla.org/show_bug.cgi?id=935069\n // crossOrigin null is the same as not set.\n\n\n if (url.indexOf('data') !== 0 && crossOrigin !== undefined && crossOrigin !== null) {\n img.crossOrigin = crossOrigin;\n } // IE10 / IE11-Fix: SVG contents from data: URI\n // will only be available if the IMG is present\n // in the DOM (and visible)\n\n\n if (url.substring(0, 14) === 'data:image/svg') {\n img.onload = null;\n fabric.util.loadImageInDom(img, onLoadCallback);\n }\n\n img.src = url;\n },\n\n /**\n * Attaches SVG image with data: URL to the dom\n * @memberOf fabric.util\n * @param {Object} img Image object with data:image/svg src\n * @param {Function} callback Callback; invoked with loaded image\n * @return {Object} DOM element (div containing the SVG image)\n */\n loadImageInDom: function (img, onLoadCallback) {\n var div = fabric.document.createElement('div');\n div.style.width = div.style.height = '1px';\n div.style.left = div.style.top = '-100%';\n div.style.position = 'absolute';\n div.appendChild(img);\n fabric.document.querySelector('body').appendChild(div);\n /**\n * Wrap in function to:\n * 1. Call existing callback\n * 2. Cleanup DOM\n */\n\n img.onload = function () {\n onLoadCallback();\n div.parentNode.removeChild(div);\n div = null;\n };\n },\n\n /**\n * Creates corresponding fabric instances from their object representations\n * @static\n * @memberOf fabric.util\n * @param {Array} objects Objects to enliven\n * @param {Function} callback Callback to invoke when all objects are created\n * @param {String} namespace Namespace to get klass \"Class\" object from\n * @param {Function} reviver Method for further parsing of object elements,\n * called after each fabric object created.\n */\n enlivenObjects: function (objects, callback, namespace, reviver) {\n objects = objects || [];\n var enlivenedObjects = [],\n numLoadedObjects = 0,\n numTotalObjects = objects.length;\n\n function onLoaded() {\n if (++numLoadedObjects === numTotalObjects) {\n callback && callback(enlivenedObjects.filter(function (obj) {\n // filter out undefined objects (objects that gave error)\n return obj;\n }));\n }\n }\n\n if (!numTotalObjects) {\n callback && callback(enlivenedObjects);\n return;\n }\n\n objects.forEach(function (o, index) {\n // if sparse array\n if (!o || !o.type) {\n onLoaded();\n return;\n }\n\n var klass = fabric.util.getKlass(o.type, namespace);\n klass.fromObject(o, function (obj, error) {\n error || (enlivenedObjects[index] = obj);\n reviver && reviver(o, obj, error);\n onLoaded();\n });\n });\n },\n\n /**\n * Create and wait for loading of patterns\n * @static\n * @memberOf fabric.util\n * @param {Array} patterns Objects to enliven\n * @param {Function} callback Callback to invoke when all objects are created\n * called after each fabric object created.\n */\n enlivenPatterns: function (patterns, callback) {\n patterns = patterns || [];\n\n function onLoaded() {\n if (++numLoadedPatterns === numPatterns) {\n callback && callback(enlivenedPatterns);\n }\n }\n\n var enlivenedPatterns = [],\n numLoadedPatterns = 0,\n numPatterns = patterns.length;\n\n if (!numPatterns) {\n callback && callback(enlivenedPatterns);\n return;\n }\n\n patterns.forEach(function (p, index) {\n if (p && p.source) {\n new fabric.Pattern(p, function (pattern) {\n enlivenedPatterns[index] = pattern;\n onLoaded();\n });\n } else {\n enlivenedPatterns[index] = p;\n onLoaded();\n }\n });\n },\n\n /**\n * Groups SVG elements (usually those retrieved from SVG document)\n * @static\n * @memberOf fabric.util\n * @param {Array} elements SVG elements to group\n * @param {Object} [options] Options object\n * @param {String} path Value to set sourcePath to\n * @return {fabric.Object|fabric.Group}\n */\n groupSVGElements: function (elements, options, path) {\n var object;\n\n if (elements && elements.length === 1) {\n return elements[0];\n }\n\n if (options) {\n if (options.width && options.height) {\n options.centerPoint = {\n x: options.width / 2,\n y: options.height / 2\n };\n } else {\n delete options.width;\n delete options.height;\n }\n }\n\n object = new fabric.Group(elements, options);\n\n if (typeof path !== 'undefined') {\n object.sourcePath = path;\n }\n\n return object;\n },\n\n /**\n * Populates an object with properties of another object\n * @static\n * @memberOf fabric.util\n * @param {Object} source Source object\n * @param {Object} destination Destination object\n * @return {Array} properties Properties names to include\n */\n populateWithProperties: function (source, destination, properties) {\n if (properties && Object.prototype.toString.call(properties) === '[object Array]') {\n for (var i = 0, len = properties.length; i < len; i++) {\n if (properties[i] in source) {\n destination[properties[i]] = source[properties[i]];\n }\n }\n }\n },\n\n /**\n * Draws a dashed line between two points\n *\n * This method is used to draw dashed line around selection area.\n * See <a href=\"http://stackoverflow.com/questions/4576724/dotted-stroke-in-canvas\">dotted stroke in canvas</a>\n *\n * @param {CanvasRenderingContext2D} ctx context\n * @param {Number} x start x coordinate\n * @param {Number} y start y coordinate\n * @param {Number} x2 end x coordinate\n * @param {Number} y2 end y coordinate\n * @param {Array} da dash array pattern\n */\n drawDashedLine: function (ctx, x, y, x2, y2, da) {\n var dx = x2 - x,\n dy = y2 - y,\n len = sqrt(dx * dx + dy * dy),\n rot = atan2(dy, dx),\n dc = da.length,\n di = 0,\n draw = true;\n ctx.save();\n ctx.translate(x, y);\n ctx.moveTo(0, 0);\n ctx.rotate(rot);\n x = 0;\n\n while (len > x) {\n x += da[di++ % dc];\n\n if (x > len) {\n x = len;\n }\n\n ctx[draw ? 'lineTo' : 'moveTo'](x, 0);\n draw = !draw;\n }\n\n ctx.restore();\n },\n\n /**\n * Creates canvas element\n * @static\n * @memberOf fabric.util\n * @return {CanvasElement} initialized canvas element\n */\n createCanvasElement: function () {\n return fabric.document.createElement('canvas');\n },\n\n /**\n * Creates a canvas element that is a copy of another and is also painted\n * @param {CanvasElement} canvas to copy size and content of\n * @static\n * @memberOf fabric.util\n * @return {CanvasElement} initialized canvas element\n */\n copyCanvasElement: function (canvas) {\n var newCanvas = fabric.util.createCanvasElement();\n newCanvas.width = canvas.width;\n newCanvas.height = canvas.height;\n newCanvas.getContext('2d').drawImage(canvas, 0, 0);\n return newCanvas;\n },\n\n /**\n * since 2.6.0 moved from canvas instance to utility.\n * @param {CanvasElement} canvasEl to copy size and content of\n * @param {String} format 'jpeg' or 'png', in some browsers 'webp' is ok too\n * @param {Number} quality <= 1 and > 0\n * @static\n * @memberOf fabric.util\n * @return {String} data url\n */\n toDataURL: function (canvasEl, format, quality) {\n return canvasEl.toDataURL('image/' + format, quality);\n },\n\n /**\n * Creates image element (works on client and node)\n * @static\n * @memberOf fabric.util\n * @return {HTMLImageElement} HTML image element\n */\n createImage: function () {\n return fabric.document.createElement('img');\n },\n\n /**\n * Multiply matrix A by matrix B to nest transformations\n * @static\n * @memberOf fabric.util\n * @param {Array} a First transformMatrix\n * @param {Array} b Second transformMatrix\n * @param {Boolean} is2x2 flag to multiply matrices as 2x2 matrices\n * @return {Array} The product of the two transform matrices\n */\n multiplyTransformMatrices: function (a, b, is2x2) {\n // Matrix multiply a * b\n return [a[0] * b[0] + a[2] * b[1], a[1] * b[0] + a[3] * b[1], a[0] * b[2] + a[2] * b[3], a[1] * b[2] + a[3] * b[3], is2x2 ? 0 : a[0] * b[4] + a[2] * b[5] + a[4], is2x2 ? 0 : a[1] * b[4] + a[3] * b[5] + a[5]];\n },\n\n /**\n * Decomposes standard 2x3 matrix into transform components\n * @static\n * @memberOf fabric.util\n * @param {Array} a transformMatrix\n * @return {Object} Components of transform\n */\n qrDecompose: function (a) {\n var angle = atan2(a[1], a[0]),\n denom = pow(a[0], 2) + pow(a[1], 2),\n scaleX = sqrt(denom),\n scaleY = (a[0] * a[3] - a[2] * a[1]) / scaleX,\n skewX = atan2(a[0] * a[2] + a[1] * a[3], denom);\n return {\n angle: angle / PiBy180,\n scaleX: scaleX,\n scaleY: scaleY,\n skewX: skewX / PiBy180,\n skewY: 0,\n translateX: a[4],\n translateY: a[5]\n };\n },\n\n /**\n * Returns a transform matrix starting from an object of the same kind of\n * the one returned from qrDecompose, useful also if you want to calculate some\n * transformations from an object that is not enlived yet\n * @static\n * @memberOf fabric.util\n * @param {Object} options\n * @param {Number} [options.angle] angle in degrees\n * @return {Number[]} transform matrix\n */\n calcRotateMatrix: function (options) {\n if (!options.angle) {\n return fabric.iMatrix.concat();\n }\n\n var theta = fabric.util.degreesToRadians(options.angle),\n cos = fabric.util.cos(theta),\n sin = fabric.util.sin(theta);\n return [cos, sin, -sin, cos, 0, 0];\n },\n\n /**\n * Returns a transform matrix starting from an object of the same kind of\n * the one returned from qrDecompose, useful also if you want to calculate some\n * transformations from an object that is not enlived yet.\n * is called DimensionsTransformMatrix because those properties are the one that influence\n * the size of the resulting box of the object.\n * @static\n * @memberOf fabric.util\n * @param {Object} options\n * @param {Number} [options.scaleX]\n * @param {Number} [options.scaleY]\n * @param {Boolean} [options.flipX]\n * @param {Boolean} [options.flipY]\n * @param {Number} [options.skewX]\n * @param {Number} [options.skewX]\n * @return {Number[]} transform matrix\n */\n calcDimensionsMatrix: function (options) {\n var scaleX = typeof options.scaleX === 'undefined' ? 1 : options.scaleX,\n scaleY = typeof options.scaleY === 'undefined' ? 1 : options.scaleY,\n scaleMatrix = [options.flipX ? -scaleX : scaleX, 0, 0, options.flipY ? -scaleY : scaleY, 0, 0],\n multiply = fabric.util.multiplyTransformMatrices,\n degreesToRadians = fabric.util.degreesToRadians;\n\n if (options.skewX) {\n scaleMatrix = multiply(scaleMatrix, [1, 0, Math.tan(degreesToRadians(options.skewX)), 1], true);\n }\n\n if (options.skewY) {\n scaleMatrix = multiply(scaleMatrix, [1, Math.tan(degreesToRadians(options.skewY)), 0, 1], true);\n }\n\n return scaleMatrix;\n },\n\n /**\n * Returns a transform matrix starting from an object of the same kind of\n * the one returned from qrDecompose, useful also if you want to calculate some\n * transformations from an object that is not enlived yet\n * @static\n * @memberOf fabric.util\n * @param {Object} options\n * @param {Number} [options.angle]\n * @param {Number} [options.scaleX]\n * @param {Number} [options.scaleY]\n * @param {Boolean} [options.flipX]\n * @param {Boolean} [options.flipY]\n * @param {Number} [options.skewX]\n * @param {Number} [options.skewX]\n * @param {Number} [options.translateX]\n * @param {Number} [options.translateY]\n * @return {Number[]} transform matrix\n */\n composeMatrix: function (options) {\n var matrix = [1, 0, 0, 1, options.translateX || 0, options.translateY || 0],\n multiply = fabric.util.multiplyTransformMatrices;\n\n if (options.angle) {\n matrix = multiply(matrix, fabric.util.calcRotateMatrix(options));\n }\n\n if (options.scaleX !== 1 || options.scaleY !== 1 || options.skewX || options.skewY || options.flipX || options.flipY) {\n matrix = multiply(matrix, fabric.util.calcDimensionsMatrix(options));\n }\n\n return matrix;\n },\n\n /**\n * reset an object transform state to neutral. Top and left are not accounted for\n * @static\n * @memberOf fabric.util\n * @param {fabric.Object} target object to transform\n */\n resetObjectTransform: function (target) {\n target.scaleX = 1;\n target.scaleY = 1;\n target.skewX = 0;\n target.skewY = 0;\n target.flipX = false;\n target.flipY = false;\n target.rotate(0);\n },\n\n /**\n * Extract Object transform values\n * @static\n * @memberOf fabric.util\n * @param {fabric.Object} target object to read from\n * @return {Object} Components of transform\n */\n saveObjectTransform: function (target) {\n return {\n scaleX: target.scaleX,\n scaleY: target.scaleY,\n skewX: target.skewX,\n skewY: target.skewY,\n angle: target.angle,\n left: target.left,\n flipX: target.flipX,\n flipY: target.flipY,\n top: target.top\n };\n },\n\n /**\n * Returns true if context has transparent pixel\n * at specified location (taking tolerance into account)\n * @param {CanvasRenderingContext2D} ctx context\n * @param {Number} x x coordinate\n * @param {Number} y y coordinate\n * @param {Number} tolerance Tolerance\n */\n isTransparent: function (ctx, x, y, tolerance) {\n // If tolerance is > 0 adjust start coords to take into account.\n // If moves off Canvas fix to 0\n if (tolerance > 0) {\n if (x > tolerance) {\n x -= tolerance;\n } else {\n x = 0;\n }\n\n if (y > tolerance) {\n y -= tolerance;\n } else {\n y = 0;\n }\n }\n\n var _isTransparent = true,\n i,\n temp,\n imageData = ctx.getImageData(x, y, tolerance * 2 || 1, tolerance * 2 || 1),\n l = imageData.data.length; // Split image data - for tolerance > 1, pixelDataSize = 4;\n\n for (i = 3; i < l; i += 4) {\n temp = imageData.data[i];\n _isTransparent = temp <= 0;\n\n if (_isTransparent === false) {\n break; // Stop if colour found\n }\n }\n\n imageData = null;\n return _isTransparent;\n },\n\n /**\n * Parse preserveAspectRatio attribute from element\n * @param {string} attribute to be parsed\n * @return {Object} an object containing align and meetOrSlice attribute\n */\n parsePreserveAspectRatioAttribute: function (attribute) {\n var meetOrSlice = 'meet',\n alignX = 'Mid',\n alignY = 'Mid',\n aspectRatioAttrs = attribute.split(' '),\n align;\n\n if (aspectRatioAttrs && aspectRatioAttrs.length) {\n meetOrSlice = aspectRatioAttrs.pop();\n\n if (meetOrSlice !== 'meet' && meetOrSlice !== 'slice') {\n align = meetOrSlice;\n meetOrSlice = 'meet';\n } else if (aspectRatioAttrs.length) {\n align = aspectRatioAttrs.pop();\n }\n } //divide align in alignX and alignY\n\n\n alignX = align !== 'none' ? align.slice(1, 4) : 'none';\n alignY = align !== 'none' ? align.slice(5, 8) : 'none';\n return {\n meetOrSlice: meetOrSlice,\n alignX: alignX,\n alignY: alignY\n };\n },\n\n /**\n * Clear char widths cache for the given font family or all the cache if no\n * fontFamily is specified.\n * Use it if you know you are loading fonts in a lazy way and you are not waiting\n * for custom fonts to load properly when adding text objects to the canvas.\n * If a text object is added when its own font is not loaded yet, you will get wrong\n * measurement and so wrong bounding boxes.\n * After the font cache is cleared, either change the textObject text content or call\n * initDimensions() to trigger a recalculation\n * @memberOf fabric.util\n * @param {String} [fontFamily] font family to clear\n */\n clearFabricFontCache: function (fontFamily) {\n fontFamily = (fontFamily || '').toLowerCase();\n\n if (!fontFamily) {\n fabric.charWidthsCache = {};\n } else if (fabric.charWidthsCache[fontFamily]) {\n delete fabric.charWidthsCache[fontFamily];\n }\n },\n\n /**\n * Given current aspect ratio, determines the max width and height that can\n * respect the total allowed area for the cache.\n * @memberOf fabric.util\n * @param {Number} ar aspect ratio\n * @param {Number} maximumArea Maximum area you want to achieve\n * @return {Object.x} Limited dimensions by X\n * @return {Object.y} Limited dimensions by Y\n */\n limitDimsByArea: function (ar, maximumArea) {\n var roughWidth = Math.sqrt(maximumArea * ar),\n perfLimitSizeY = Math.floor(maximumArea / roughWidth);\n return {\n x: Math.floor(roughWidth),\n y: perfLimitSizeY\n };\n },\n capValue: function (min, value, max) {\n return Math.max(min, Math.min(value, max));\n },\n\n /**\n * Finds the scale for the object source to fit inside the object destination,\n * keeping aspect ratio intact.\n * respect the total allowed area for the cache.\n * @memberOf fabric.util\n * @param {Object | fabric.Object} source\n * @param {Number} source.height natural unscaled height of the object\n * @param {Number} source.width natural unscaled width of the object\n * @param {Object | fabric.Object} destination\n * @param {Number} destination.height natural unscaled height of the object\n * @param {Number} destination.width natural unscaled width of the object\n * @return {Number} scale factor to apply to source to fit into destination\n */\n findScaleToFit: function (source, destination) {\n return Math.min(destination.width / source.width, destination.height / source.height);\n },\n\n /**\n * Finds the scale for the object source to cover entirely the object destination,\n * keeping aspect ratio intact.\n * respect the total allowed area for the cache.\n * @memberOf fabric.util\n * @param {Object | fabric.Object} source\n * @param {Number} source.height natural unscaled height of the object\n * @param {Number} source.width natural unscaled width of the object\n * @param {Object | fabric.Object} destination\n * @param {Number} destination.height natural unscaled height of the object\n * @param {Number} destination.width natural unscaled width of the object\n * @return {Number} scale factor to apply to source to cover destination\n */\n findScaleToCover: function (source, destination) {\n return Math.max(destination.width / source.width, destination.height / source.height);\n },\n\n /**\n * given an array of 6 number returns something like `\"matrix(...numbers)\"`\n * @memberOf fabric.util\n * @param {Array} trasnform an array with 6 numbers\n * @return {String} transform matrix for svg\n * @return {Object.y} Limited dimensions by Y\n */\n matrixToSVG: function (transform) {\n return 'matrix(' + transform.map(function (value) {\n return fabric.util.toFixed(value, fabric.Object.NUM_FRACTION_DIGITS);\n }).join(' ') + ')';\n },\n\n /**\n * given a width and height, return the size of the bounding box\n * that can contains the box with width/height with applied transform\n * described in options.\n * Use to calculate the boxes around objects for controls.\n * @memberOf fabric.util\n * @param {Number} width\n * @param {Number} height\n * @param {Object} options\n * @param {Number} options.scaleX\n * @param {Number} options.scaleY\n * @param {Number} options.skewX\n * @param {Number} options.skewY\n * @return {Object.x} width of containing\n * @return {Object.y} height of containing\n */\n sizeAfterTransform: function (width, height, options) {\n var dimX = width / 2,\n dimY = height / 2,\n points = [{\n x: -dimX,\n y: -dimY\n }, {\n x: dimX,\n y: -dimY\n }, {\n x: -dimX,\n y: dimY\n }, {\n x: dimX,\n y: dimY\n }],\n transformMatrix = fabric.util.calcDimensionsMatrix(options),\n bbox = fabric.util.makeBoundingBoxFromPoints(points, transformMatrix);\n return {\n x: bbox.width,\n y: bbox.height\n };\n }\n };\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function () {\n var _join = Array.prototype.join,\n commandLengths = {\n m: 2,\n l: 2,\n h: 1,\n v: 1,\n c: 6,\n s: 4,\n q: 4,\n t: 2,\n a: 7\n },\n repeatedCommands = {\n m: 'l',\n M: 'L'\n };\n\n function segmentToBezier(th2, th3, cosTh, sinTh, rx, ry, cx1, cy1, mT, fromX, fromY) {\n var costh2 = fabric.util.cos(th2),\n sinth2 = fabric.util.sin(th2),\n costh3 = fabric.util.cos(th3),\n sinth3 = fabric.util.sin(th3),\n toX = cosTh * rx * costh3 - sinTh * ry * sinth3 + cx1,\n toY = sinTh * rx * costh3 + cosTh * ry * sinth3 + cy1,\n cp1X = fromX + mT * (-cosTh * rx * sinth2 - sinTh * ry * costh2),\n cp1Y = fromY + mT * (-sinTh * rx * sinth2 + cosTh * ry * costh2),\n cp2X = toX + mT * (cosTh * rx * sinth3 + sinTh * ry * costh3),\n cp2Y = toY + mT * (sinTh * rx * sinth3 - cosTh * ry * costh3);\n return ['C', cp1X, cp1Y, cp2X, cp2Y, toX, toY];\n }\n /* Adapted from http://dxr.mozilla.org/mozilla-central/source/content/svg/content/src/nsSVGPathDataParser.cpp\n * by Andrea Bogazzi code is under MPL. if you don't have a copy of the license you can take it here\n * http://mozilla.org/MPL/2.0/\n */\n\n\n function arcToSegments(toX, toY, rx, ry, large, sweep, rotateX) {\n var PI = Math.PI,\n th = rotateX * PI / 180,\n sinTh = fabric.util.sin(th),\n cosTh = fabric.util.cos(th),\n fromX = 0,\n fromY = 0;\n rx = Math.abs(rx);\n ry = Math.abs(ry);\n var px = -cosTh * toX * 0.5 - sinTh * toY * 0.5,\n py = -cosTh * toY * 0.5 + sinTh * toX * 0.5,\n rx2 = rx * rx,\n ry2 = ry * ry,\n py2 = py * py,\n px2 = px * px,\n pl = rx2 * ry2 - rx2 * py2 - ry2 * px2,\n root = 0;\n\n if (pl < 0) {\n var s = Math.sqrt(1 - pl / (rx2 * ry2));\n rx *= s;\n ry *= s;\n } else {\n root = (large === sweep ? -1.0 : 1.0) * Math.sqrt(pl / (rx2 * py2 + ry2 * px2));\n }\n\n var cx = root * rx * py / ry,\n cy = -root * ry * px / rx,\n cx1 = cosTh * cx - sinTh * cy + toX * 0.5,\n cy1 = sinTh * cx + cosTh * cy + toY * 0.5,\n mTheta = calcVectorAngle(1, 0, (px - cx) / rx, (py - cy) / ry),\n dtheta = calcVectorAngle((px - cx) / rx, (py - cy) / ry, (-px - cx) / rx, (-py - cy) / ry);\n\n if (sweep === 0 && dtheta > 0) {\n dtheta -= 2 * PI;\n } else if (sweep === 1 && dtheta < 0) {\n dtheta += 2 * PI;\n } // Convert into cubic bezier segments <= 90deg\n\n\n var segments = Math.ceil(Math.abs(dtheta / PI * 2)),\n result = [],\n mDelta = dtheta / segments,\n mT = 8 / 3 * Math.sin(mDelta / 4) * Math.sin(mDelta / 4) / Math.sin(mDelta / 2),\n th3 = mTheta + mDelta;\n\n for (var i = 0; i < segments; i++) {\n result[i] = segmentToBezier(mTheta, th3, cosTh, sinTh, rx, ry, cx1, cy1, mT, fromX, fromY);\n fromX = result[i][5];\n fromY = result[i][6];\n mTheta = th3;\n th3 += mDelta;\n }\n\n return result;\n }\n /*\n * Private\n */\n\n\n function calcVectorAngle(ux, uy, vx, vy) {\n var ta = Math.atan2(uy, ux),\n tb = Math.atan2(vy, vx);\n\n if (tb >= ta) {\n return tb - ta;\n } else {\n return 2 * Math.PI - (ta - tb);\n }\n }\n /**\n * Calculate bounding box of a beziercurve\n * @param {Number} x0 starting point\n * @param {Number} y0\n * @param {Number} x1 first control point\n * @param {Number} y1\n * @param {Number} x2 secondo control point\n * @param {Number} y2\n * @param {Number} x3 end of beizer\n * @param {Number} y3\n */\n // taken from http://jsbin.com/ivomiq/56/edit no credits available for that.\n // TODO: can we normalize this with the starting points set at 0 and then translated the bbox?\n\n\n function getBoundsOfCurve(x0, y0, x1, y1, x2, y2, x3, y3) {\n var argsString;\n\n if (fabric.cachesBoundsOfCurve) {\n argsString = _join.call(arguments);\n\n if (fabric.boundsOfCurveCache[argsString]) {\n return fabric.boundsOfCurveCache[argsString];\n }\n }\n\n var sqrt = Math.sqrt,\n min = Math.min,\n max = Math.max,\n abs = Math.abs,\n tvalues = [],\n bounds = [[], []],\n a,\n b,\n c,\n t,\n t1,\n t2,\n b2ac,\n sqrtb2ac;\n b = 6 * x0 - 12 * x1 + 6 * x2;\n a = -3 * x0 + 9 * x1 - 9 * x2 + 3 * x3;\n c = 3 * x1 - 3 * x0;\n\n for (var i = 0; i < 2; ++i) {\n if (i > 0) {\n b = 6 * y0 - 12 * y1 + 6 * y2;\n a = -3 * y0 + 9 * y1 - 9 * y2 + 3 * y3;\n c = 3 * y1 - 3 * y0;\n }\n\n if (abs(a) < 1e-12) {\n if (abs(b) < 1e-12) {\n continue;\n }\n\n t = -c / b;\n\n if (0 < t && t < 1) {\n tvalues.push(t);\n }\n\n continue;\n }\n\n b2ac = b * b - 4 * c * a;\n\n if (b2ac < 0) {\n continue;\n }\n\n sqrtb2ac = sqrt(b2ac);\n t1 = (-b + sqrtb2ac) / (2 * a);\n\n if (0 < t1 && t1 < 1) {\n tvalues.push(t1);\n }\n\n t2 = (-b - sqrtb2ac) / (2 * a);\n\n if (0 < t2 && t2 < 1) {\n tvalues.push(t2);\n }\n }\n\n var x,\n y,\n j = tvalues.length,\n jlen = j,\n mt;\n\n while (j--) {\n t = tvalues[j];\n mt = 1 - t;\n x = mt * mt * mt * x0 + 3 * mt * mt * t * x1 + 3 * mt * t * t * x2 + t * t * t * x3;\n bounds[0][j] = x;\n y = mt * mt * mt * y0 + 3 * mt * mt * t * y1 + 3 * mt * t * t * y2 + t * t * t * y3;\n bounds[1][j] = y;\n }\n\n bounds[0][jlen] = x0;\n bounds[1][jlen] = y0;\n bounds[0][jlen + 1] = x3;\n bounds[1][jlen + 1] = y3;\n var result = [{\n x: min.apply(null, bounds[0]),\n y: min.apply(null, bounds[1])\n }, {\n x: max.apply(null, bounds[0]),\n y: max.apply(null, bounds[1])\n }];\n\n if (fabric.cachesBoundsOfCurve) {\n fabric.boundsOfCurveCache[argsString] = result;\n }\n\n return result;\n }\n /**\n * Converts arc to a bunch of beizer curves\n * @param {Number} fx starting point x\n * @param {Number} fy starting point y\n * @param {Array} coords Arc command\n */\n\n\n function fromArcToBeizers(fx, fy, coords) {\n var rx = coords[1],\n ry = coords[2],\n rot = coords[3],\n large = coords[4],\n sweep = coords[5],\n tx = coords[6],\n ty = coords[7],\n segsNorm = arcToSegments(tx - fx, ty - fy, rx, ry, large, sweep, rot);\n\n for (var i = 0, len = segsNorm.length; i < len; i++) {\n segsNorm[i][1] += fx;\n segsNorm[i][2] += fy;\n segsNorm[i][3] += fx;\n segsNorm[i][4] += fy;\n segsNorm[i][5] += fx;\n segsNorm[i][6] += fy;\n }\n\n return segsNorm;\n }\n\n ;\n\n function makePathSimpler(path) {\n // x and y represent the last point of the path. the previous command point.\n // we add them to each relative command to make it an absolute comment.\n // we also swap the v V h H with L, because are easier to transform.\n var x = 0,\n y = 0,\n len = path.length,\n // x1 and y1 represent the last point of the subpath. the subpath is started with\n // m or M command. When a z or Z command is drawn, x and y need to be resetted to\n // the last x1 and y1.\n x1 = 0,\n y1 = 0,\n current,\n i,\n converted,\n // previous will host the letter of the previous command, to handle S and T.\n // controlX and controlY will host the previous reflected control point\n destinationPath = [],\n previous,\n controlX,\n controlY;\n\n for (i = 0; i < len; ++i) {\n converted = false;\n current = path[i].slice(0);\n\n switch (current[0]) {\n // first letter\n case 'l':\n // lineto, relative\n current[0] = 'L';\n current[1] += x;\n current[2] += y;\n // falls through\n\n case 'L':\n x = current[1];\n y = current[2];\n break;\n\n case 'h':\n // horizontal lineto, relative\n current[1] += x;\n // falls through\n\n case 'H':\n current[0] = 'L';\n current[2] = y;\n x = current[1];\n break;\n\n case 'v':\n // vertical lineto, relative\n current[1] += y;\n // falls through\n\n case 'V':\n current[0] = 'L';\n y = current[1];\n current[1] = x;\n current[2] = y;\n break;\n\n case 'm':\n // moveTo, relative\n current[0] = 'M';\n current[1] += x;\n current[2] += y;\n // falls through\n\n case 'M':\n x = current[1];\n y = current[2];\n x1 = current[1];\n y1 = current[2];\n break;\n\n case 'c':\n // bezierCurveTo, relative\n current[0] = 'C';\n current[1] += x;\n current[2] += y;\n current[3] += x;\n current[4] += y;\n current[5] += x;\n current[6] += y;\n // falls through\n\n case 'C':\n controlX = current[3];\n controlY = current[4];\n x = current[5];\n y = current[6];\n break;\n\n case 's':\n // shorthand cubic bezierCurveTo, relative\n current[0] = 'S';\n current[1] += x;\n current[2] += y;\n current[3] += x;\n current[4] += y;\n // falls through\n\n case 'S':\n // would be sScC but since we are swapping sSc for C, we check just that.\n if (previous === 'C') {\n // calculate reflection of previous control points\n controlX = 2 * x - controlX;\n controlY = 2 * y - controlY;\n } else {\n // If there is no previous command or if the previous command was not a C, c, S, or s,\n // the control point is coincident with the current point\n controlX = x;\n controlY = y;\n }\n\n x = current[3];\n y = current[4];\n current[0] = 'C';\n current[5] = current[3];\n current[6] = current[4];\n current[3] = current[1];\n current[4] = current[2];\n current[1] = controlX;\n current[2] = controlY; // current[3] and current[4] are NOW the second control point.\n // we keep it for the next reflection.\n\n controlX = current[3];\n controlY = current[4];\n break;\n\n case 'q':\n // quadraticCurveTo, relative\n current[0] = 'Q';\n current[1] += x;\n current[2] += y;\n current[3] += x;\n current[4] += y;\n // falls through\n\n case 'Q':\n controlX = current[1];\n controlY = current[2];\n x = current[3];\n y = current[4];\n break;\n\n case 't':\n // shorthand quadraticCurveTo, relative\n current[0] = 'T';\n current[1] += x;\n current[2] += y;\n // falls through\n\n case 'T':\n if (previous === 'Q') {\n // calculate reflection of previous control point\n controlX = 2 * x - controlX;\n controlY = 2 * y - controlY;\n } else {\n // If there is no previous command or if the previous command was not a Q, q, T or t,\n // assume the control point is coincident with the current point\n controlX = x;\n controlY = y;\n }\n\n current[0] = 'Q';\n x = current[1];\n y = current[2];\n current[1] = controlX;\n current[2] = controlY;\n current[3] = x;\n current[4] = y;\n break;\n\n case 'a':\n current[0] = 'A';\n current[6] += x;\n current[7] += y;\n // falls through\n\n case 'A':\n converted = true;\n destinationPath = destinationPath.concat(fromArcToBeizers(x, y, current));\n x = current[6];\n y = current[7];\n break;\n\n case 'z':\n case 'Z':\n x = x1;\n y = y1;\n break;\n\n default:\n }\n\n if (!converted) {\n destinationPath.push(current);\n }\n\n previous = current[0];\n }\n\n return destinationPath;\n }\n\n ;\n /**\n * Calc length from point x1,y1 to x2,y2\n * @param {Number} x1 starting point x\n * @param {Number} y1 starting point y\n * @param {Number} x2 starting point x\n * @param {Number} y2 starting point y\n * @return {Number} length of segment\n */\n\n function calcLineLength(x1, y1, x2, y2) {\n return Math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));\n } // functions for the Cubic beizer\n // taken from: https://github.com/konvajs/konva/blob/7.0.5/src/shapes/Path.ts#L350\n\n\n function CB1(t) {\n return t * t * t;\n }\n\n function CB2(t) {\n return 3 * t * t * (1 - t);\n }\n\n function CB3(t) {\n return 3 * t * (1 - t) * (1 - t);\n }\n\n function CB4(t) {\n return (1 - t) * (1 - t) * (1 - t);\n }\n\n function getPointOnCubicBezierIterator(p1x, p1y, p2x, p2y, p3x, p3y, p4x, p4y) {\n return function (pct) {\n var c1 = CB1(pct),\n c2 = CB2(pct),\n c3 = CB3(pct),\n c4 = CB4(pct);\n return {\n x: p4x * c1 + p3x * c2 + p2x * c3 + p1x * c4,\n y: p4y * c1 + p3y * c2 + p2y * c3 + p1y * c4\n };\n };\n }\n\n function QB1(t) {\n return t * t;\n }\n\n function QB2(t) {\n return 2 * t * (1 - t);\n }\n\n function QB3(t) {\n return (1 - t) * (1 - t);\n }\n\n function getPointOnQuadraticBezierIterator(p1x, p1y, p2x, p2y, p3x, p3y) {\n return function (pct) {\n var c1 = QB1(pct),\n c2 = QB2(pct),\n c3 = QB3(pct);\n return {\n x: p3x * c1 + p2x * c2 + p1x * c3,\n y: p3y * c1 + p2y * c2 + p1y * c3\n };\n };\n }\n\n function pathIterator(iterator, x1, y1) {\n var tempP = {\n x: x1,\n y: y1\n },\n p,\n tmpLen = 0,\n perc;\n\n for (perc = 0.01; perc <= 1; perc += 0.01) {\n p = iterator(perc);\n tmpLen += calcLineLength(tempP.x, tempP.y, p.x, p.y);\n tempP = p;\n }\n\n return tmpLen;\n } //measures the length of a pre-simplified path\n\n\n function getPathSegmentsInfo(path) {\n var totalLength = 0,\n len = path.length,\n current,\n //x2 and y2 are the coords of segment start\n //x1 and y1 are the coords of the current point\n x1 = 0,\n y1 = 0,\n x2 = 0,\n y2 = 0,\n info = [],\n iterator,\n tempInfo;\n\n for (var i = 0; i < len; i++) {\n current = path[i];\n tempInfo = {\n x: x1,\n y: y1,\n command: current[0]\n };\n\n switch (current[0]) {\n //first letter\n case 'M':\n tempInfo.length = 0;\n x2 = x1 = current[1];\n y2 = y1 = current[2];\n break;\n\n case 'L':\n tempInfo.length = calcLineLength(x1, y1, current[1], current[2]);\n x1 = current[1];\n y1 = current[2];\n break;\n\n case 'C':\n iterator = getPointOnCubicBezierIterator(x1, y1, current[1], current[2], current[3], current[4], current[5], current[6]);\n tempInfo.length = pathIterator(iterator, x1, y1);\n x1 = current[5];\n y1 = current[6];\n break;\n\n case 'Q':\n iterator = getPointOnQuadraticBezierIterator(x1, y1, current[1], current[2], current[3], current[4]);\n tempInfo.length = pathIterator(iterator, x1, y1);\n x1 = current[3];\n y1 = current[4];\n break;\n\n case 'Z':\n case 'z':\n // we add those in order to ease calculations later\n tempInfo.destX = x2;\n tempInfo.destY = y2;\n tempInfo.length = calcLineLength(x1, y1, x2, y2);\n x1 = x2;\n y1 = y2;\n break;\n }\n\n totalLength += tempInfo.length;\n info.push(tempInfo);\n }\n\n info.push({\n length: totalLength,\n x: x1,\n y: y1\n });\n return info;\n }\n\n function getPointOnPath(path, perc, infos) {\n if (!infos) {\n infos = getPathSegmentsInfo(path);\n }\n\n var distance = infos[infos.length - 1] * perc,\n i = 0;\n\n while (distance - infos[i] > 0 && i < infos.length) {\n distance -= infos[i];\n i++;\n }\n\n var segInfo = infos[i],\n segPercent = distance / segInfo.length,\n command = segInfo.length,\n segment = path[i];\n\n switch (command) {\n case 'Z':\n case 'z':\n return new fabric.Point(segInfo.x, segInfo.y).lerp(new fabric.Point(segInfo.destX, segInfo.destY), segPercent);\n break;\n\n case 'L':\n return new fabric.Point(segInfo.x, segInfo.y).lerp(new fabric.Point(segment[1], segment[2]), segPercent);\n break;\n\n case 'C':\n return getPointOnCubicBezierIterator(segInfo.x, segInfo.y, segment[1], segment[2], segment[3], segment[4], segment[5], segment[6])(segPercent);\n break;\n\n case 'Q':\n return getPointOnQuadraticBezierIterator(segInfo.x, segInfo.y, segment[1], segment[2], segment[3], segment[4])(segPercent);\n break;\n }\n }\n\n function parsePath(pathString) {\n var result = [],\n coords = [],\n currentPath,\n parsed,\n re = fabric.rePathCommand,\n rNumber = '[-+]?(?:\\\\d*\\\\.\\\\d+|\\\\d+\\\\.?)(?:[eE][-+]?\\\\d+)?\\\\s*',\n rNumberCommaWsp = '(' + rNumber + ')' + fabric.commaWsp,\n rFlagCommaWsp = '([01])' + fabric.commaWsp + '?',\n rArcSeq = rNumberCommaWsp + '?' + rNumberCommaWsp + '?' + rNumberCommaWsp + rFlagCommaWsp + rFlagCommaWsp + rNumberCommaWsp + '?(' + rNumber + ')',\n regArcArgumentSequence = new RegExp(rArcSeq, 'g'),\n match,\n coordsStr,\n // one of commands (m,M,l,L,q,Q,c,C,etc.) followed by non-command characters (i.e. command values)\n path;\n\n if (!pathString || !pathString.match) {\n return result;\n }\n\n path = pathString.match(/[mzlhvcsqta][^mzlhvcsqta]*/gi);\n\n for (var i = 0, coordsParsed, len = path.length; i < len; i++) {\n currentPath = path[i];\n coordsStr = currentPath.slice(1).trim();\n coords.length = 0;\n var command = currentPath.charAt(0);\n coordsParsed = [command];\n\n if (command.toLowerCase() === 'a') {\n // arcs have special flags that apparently don't require spaces so handle special\n for (var args; args = regArcArgumentSequence.exec(coordsStr);) {\n for (var j = 1; j < args.length; j++) {\n coords.push(args[j]);\n }\n }\n } else {\n while (match = re.exec(coordsStr)) {\n coords.push(match[0]);\n }\n }\n\n for (var j = 0, jlen = coords.length; j < jlen; j++) {\n parsed = parseFloat(coords[j]);\n\n if (!isNaN(parsed)) {\n coordsParsed.push(parsed);\n }\n }\n\n var commandLength = commandLengths[command.toLowerCase()],\n repeatedCommand = repeatedCommands[command] || command;\n\n if (coordsParsed.length - 1 > commandLength) {\n for (var k = 1, klen = coordsParsed.length; k < klen; k += commandLength) {\n result.push([command].concat(coordsParsed.slice(k, k + commandLength)));\n command = repeatedCommand;\n }\n } else {\n result.push(coordsParsed);\n }\n }\n\n return result;\n }\n\n ;\n /**\n * Calculate bounding box of a elliptic-arc\n * @deprecated\n * @param {Number} fx start point of arc\n * @param {Number} fy\n * @param {Number} rx horizontal radius\n * @param {Number} ry vertical radius\n * @param {Number} rot angle of horizontal axis\n * @param {Number} large 1 or 0, whatever the arc is the big or the small on the 2 points\n * @param {Number} sweep 1 or 0, 1 clockwise or counterclockwise direction\n * @param {Number} tx end point of arc\n * @param {Number} ty\n */\n\n function getBoundsOfArc(fx, fy, rx, ry, rot, large, sweep, tx, ty) {\n var fromX = 0,\n fromY = 0,\n bound,\n bounds = [],\n segs = arcToSegments(tx - fx, ty - fy, rx, ry, large, sweep, rot);\n\n for (var i = 0, len = segs.length; i < len; i++) {\n bound = getBoundsOfCurve(fromX, fromY, segs[i][1], segs[i][2], segs[i][3], segs[i][4], segs[i][5], segs[i][6]);\n bounds.push({\n x: bound[0].x + fx,\n y: bound[0].y + fy\n });\n bounds.push({\n x: bound[1].x + fx,\n y: bound[1].y + fy\n });\n fromX = segs[i][5];\n fromY = segs[i][6];\n }\n\n return bounds;\n }\n\n ;\n /**\n * Draws arc\n * @param {CanvasRenderingContext2D} ctx\n * @param {Number} fx\n * @param {Number} fy\n * @param {Array} coords coords of the arc, without the front 'A/a'\n */\n\n function drawArc(ctx, fx, fy, coords) {\n coords = coords.slice(0).unshift('X'); // command A or a does not matter\n\n var beizers = fromArcToBeizers(fx, fy, coords);\n beizers.forEach(function (beizer) {\n ctx.bezierCurveTo.apply(ctx, beizer.slice(1));\n });\n }\n\n ;\n fabric.util.parsePath = parsePath;\n fabric.util.makePathSimpler = makePathSimpler;\n fabric.util.getPathSegmentsInfo = getPathSegmentsInfo;\n fabric.util.fromArcToBeizers = fromArcToBeizers;\n fabric.util.getBoundsOfCurve = getBoundsOfCurve;\n fabric.util.getPointOnPath = getPointOnPath; // kept because we do not want to make breaking changes.\n // but useless and deprecated.\n\n fabric.util.getBoundsOfArc = getBoundsOfArc;\n fabric.util.drawArc = drawArc;\n})();\n\n(function () {\n var slice = Array.prototype.slice;\n /**\n * Invokes method on all items in a given array\n * @memberOf fabric.util.array\n * @param {Array} array Array to iterate over\n * @param {String} method Name of a method to invoke\n * @return {Array}\n */\n\n function invoke(array, method) {\n var args = slice.call(arguments, 2),\n result = [];\n\n for (var i = 0, len = array.length; i < len; i++) {\n result[i] = args.length ? array[i][method].apply(array[i], args) : array[i][method].call(array[i]);\n }\n\n return result;\n }\n /**\n * Finds maximum value in array (not necessarily \"first\" one)\n * @memberOf fabric.util.array\n * @param {Array} array Array to iterate over\n * @param {String} byProperty\n * @return {*}\n */\n\n\n function max(array, byProperty) {\n return find(array, byProperty, function (value1, value2) {\n return value1 >= value2;\n });\n }\n /**\n * Finds minimum value in array (not necessarily \"first\" one)\n * @memberOf fabric.util.array\n * @param {Array} array Array to iterate over\n * @param {String} byProperty\n * @return {*}\n */\n\n\n function min(array, byProperty) {\n return find(array, byProperty, function (value1, value2) {\n return value1 < value2;\n });\n }\n /**\n * @private\n */\n\n\n function fill(array, value) {\n var k = array.length;\n\n while (k--) {\n array[k] = value;\n }\n\n return array;\n }\n /**\n * @private\n */\n\n\n function find(array, byProperty, condition) {\n if (!array || array.length === 0) {\n return;\n }\n\n var i = array.length - 1,\n result = byProperty ? array[i][byProperty] : array[i];\n\n if (byProperty) {\n while (i--) {\n if (condition(array[i][byProperty], result)) {\n result = array[i][byProperty];\n }\n }\n } else {\n while (i--) {\n if (condition(array[i], result)) {\n result = array[i];\n }\n }\n }\n\n return result;\n }\n /**\n * @namespace fabric.util.array\n */\n\n\n fabric.util.array = {\n fill: fill,\n invoke: invoke,\n min: min,\n max: max\n };\n})();\n\n(function () {\n /**\n * Copies all enumerable properties of one js object to another\n * this does not and cannot compete with generic utils.\n * Does not clone or extend fabric.Object subclasses.\n * This is mostly for internal use and has extra handling for fabricJS objects\n * it skips the canvas and group properties in deep cloning.\n * @memberOf fabric.util.object\n * @param {Object} destination Where to copy to\n * @param {Object} source Where to copy from\n * @return {Object}\n */\n function extend(destination, source, deep) {\n // JScript DontEnum bug is not taken care of\n // the deep clone is for internal use, is not meant to avoid\n // javascript traps or cloning html element or self referenced objects.\n if (deep) {\n if (!fabric.isLikelyNode && source instanceof Element) {\n // avoid cloning deep images, canvases,\n destination = source;\n } else if (source instanceof Array) {\n destination = [];\n\n for (var i = 0, len = source.length; i < len; i++) {\n destination[i] = extend({}, source[i], deep);\n }\n } else if (source && typeof source === 'object') {\n for (var property in source) {\n if (property === 'canvas' || property === 'group') {\n // we do not want to clone this props at all.\n // we want to keep the keys in the copy\n destination[property] = null;\n } else if (source.hasOwnProperty(property)) {\n destination[property] = extend({}, source[property], deep);\n }\n }\n } else {\n // this sounds odd for an extend but is ok for recursive use\n destination = source;\n }\n } else {\n for (var property in source) {\n destination[property] = source[property];\n }\n }\n\n return destination;\n }\n /**\n * Creates an empty object and copies all enumerable properties of another object to it\n * @memberOf fabric.util.object\n * TODO: this function return an empty object if you try to clone null\n * @param {Object} object Object to clone\n * @return {Object}\n */\n\n\n function clone(object, deep) {\n return extend({}, object, deep);\n }\n /** @namespace fabric.util.object */\n\n\n fabric.util.object = {\n extend: extend,\n clone: clone\n };\n fabric.util.object.extend(fabric.util, fabric.Observable);\n})();\n\n(function () {\n /**\n * Camelizes a string\n * @memberOf fabric.util.string\n * @param {String} string String to camelize\n * @return {String} Camelized version of a string\n */\n function camelize(string) {\n return string.replace(/-+(.)?/g, function (match, character) {\n return character ? character.toUpperCase() : '';\n });\n }\n /**\n * Capitalizes a string\n * @memberOf fabric.util.string\n * @param {String} string String to capitalize\n * @param {Boolean} [firstLetterOnly] If true only first letter is capitalized\n * and other letters stay untouched, if false first letter is capitalized\n * and other letters are converted to lowercase.\n * @return {String} Capitalized version of a string\n */\n\n\n function capitalize(string, firstLetterOnly) {\n return string.charAt(0).toUpperCase() + (firstLetterOnly ? string.slice(1) : string.slice(1).toLowerCase());\n }\n /**\n * Escapes XML in a string\n * @memberOf fabric.util.string\n * @param {String} string String to escape\n * @return {String} Escaped version of a string\n */\n\n\n function escapeXml(string) {\n return string.replace(/&/g, '&').replace(/\"/g, '"').replace(/'/g, ''').replace(/</g, '<').replace(/>/g, '>');\n }\n /**\n * Divide a string in the user perceived single units\n * @memberOf fabric.util.string\n * @param {String} textstring String to escape\n * @return {Array} array containing the graphemes\n */\n\n\n function graphemeSplit(textstring) {\n var i = 0,\n chr,\n graphemes = [];\n\n for (i = 0, chr; i < textstring.length; i++) {\n if ((chr = getWholeChar(textstring, i)) === false) {\n continue;\n }\n\n graphemes.push(chr);\n }\n\n return graphemes;\n } // taken from mdn in the charAt doc page.\n\n\n function getWholeChar(str, i) {\n var code = str.charCodeAt(i);\n\n if (isNaN(code)) {\n return ''; // Position not found\n }\n\n if (code < 0xD800 || code > 0xDFFF) {\n return str.charAt(i);\n } // High surrogate (could change last hex to 0xDB7F to treat high private\n // surrogates as single characters)\n\n\n if (0xD800 <= code && code <= 0xDBFF) {\n if (str.length <= i + 1) {\n throw 'High surrogate without following low surrogate';\n }\n\n var next = str.charCodeAt(i + 1);\n\n if (0xDC00 > next || next > 0xDFFF) {\n throw 'High surrogate without following low surrogate';\n }\n\n return str.charAt(i) + str.charAt(i + 1);\n } // Low surrogate (0xDC00 <= code && code <= 0xDFFF)\n\n\n if (i === 0) {\n throw 'Low surrogate without preceding high surrogate';\n }\n\n var prev = str.charCodeAt(i - 1); // (could change last hex to 0xDB7F to treat high private\n // surrogates as single characters)\n\n if (0xD800 > prev || prev > 0xDBFF) {\n throw 'Low surrogate without preceding high surrogate';\n } // We can pass over low surrogates now as the second component\n // in a pair which we have already processed\n\n\n return false;\n }\n /**\n * String utilities\n * @namespace fabric.util.string\n */\n\n\n fabric.util.string = {\n camelize: camelize,\n capitalize: capitalize,\n escapeXml: escapeXml,\n graphemeSplit: graphemeSplit\n };\n})();\n\n(function () {\n var slice = Array.prototype.slice,\n emptyFunction = function () {},\n IS_DONTENUM_BUGGY = function () {\n for (var p in {\n toString: 1\n }) {\n if (p === 'toString') {\n return false;\n }\n }\n\n return true;\n }(),\n\n /** @ignore */\n addMethods = function (klass, source, parent) {\n for (var property in source) {\n if (property in klass.prototype && typeof klass.prototype[property] === 'function' && (source[property] + '').indexOf('callSuper') > -1) {\n klass.prototype[property] = function (property) {\n return function () {\n var superclass = this.constructor.superclass;\n this.constructor.superclass = parent;\n var returnValue = source[property].apply(this, arguments);\n this.constructor.superclass = superclass;\n\n if (property !== 'initialize') {\n return returnValue;\n }\n };\n }(property);\n } else {\n klass.prototype[property] = source[property];\n }\n\n if (IS_DONTENUM_BUGGY) {\n if (source.toString !== Object.prototype.toString) {\n klass.prototype.toString = source.toString;\n }\n\n if (source.valueOf !== Object.prototype.valueOf) {\n klass.prototype.valueOf = source.valueOf;\n }\n }\n }\n };\n\n function Subclass() {}\n\n function callSuper(methodName) {\n var parentMethod = null,\n _this = this; // climb prototype chain to find method not equal to callee's method\n\n\n while (_this.constructor.superclass) {\n var superClassMethod = _this.constructor.superclass.prototype[methodName];\n\n if (_this[methodName] !== superClassMethod) {\n parentMethod = superClassMethod;\n break;\n } // eslint-disable-next-line\n\n\n _this = _this.constructor.superclass.prototype;\n }\n\n if (!parentMethod) {\n return console.log('tried to callSuper ' + methodName + ', method not found in prototype chain', this);\n }\n\n return arguments.length > 1 ? parentMethod.apply(this, slice.call(arguments, 1)) : parentMethod.call(this);\n }\n /**\n * Helper for creation of \"classes\".\n * @memberOf fabric.util\n * @param {Function} [parent] optional \"Class\" to inherit from\n * @param {Object} [properties] Properties shared by all instances of this class\n * (be careful modifying objects defined here as this would affect all instances)\n */\n\n\n function createClass() {\n var parent = null,\n properties = slice.call(arguments, 0);\n\n if (typeof properties[0] === 'function') {\n parent = properties.shift();\n }\n\n function klass() {\n this.initialize.apply(this, arguments);\n }\n\n klass.superclass = parent;\n klass.subclasses = [];\n\n if (parent) {\n Subclass.prototype = parent.prototype;\n klass.prototype = new Subclass();\n parent.subclasses.push(klass);\n }\n\n for (var i = 0, length = properties.length; i < length; i++) {\n addMethods(klass, properties[i], parent);\n }\n\n if (!klass.prototype.initialize) {\n klass.prototype.initialize = emptyFunction;\n }\n\n klass.prototype.constructor = klass;\n klass.prototype.callSuper = callSuper;\n return klass;\n }\n\n fabric.util.createClass = createClass;\n})();\n\n(function () {\n // since ie11 can use addEventListener but they do not support options, i need to check\n var couldUseAttachEvent = !!fabric.document.createElement('div').attachEvent,\n touchEvents = ['touchstart', 'touchmove', 'touchend'];\n /**\n * Adds an event listener to an element\n * @function\n * @memberOf fabric.util\n * @param {HTMLElement} element\n * @param {String} eventName\n * @param {Function} handler\n */\n\n fabric.util.addListener = function (element, eventName, handler, options) {\n element && element.addEventListener(eventName, handler, couldUseAttachEvent ? false : options);\n };\n /**\n * Removes an event listener from an element\n * @function\n * @memberOf fabric.util\n * @param {HTMLElement} element\n * @param {String} eventName\n * @param {Function} handler\n */\n\n\n fabric.util.removeListener = function (element, eventName, handler, options) {\n element && element.removeEventListener(eventName, handler, couldUseAttachEvent ? false : options);\n };\n\n function getTouchInfo(event) {\n var touchProp = event.changedTouches;\n\n if (touchProp && touchProp[0]) {\n return touchProp[0];\n }\n\n return event;\n }\n\n fabric.util.getPointer = function (event) {\n var element = event.target,\n scroll = fabric.util.getScrollLeftTop(element),\n _evt = getTouchInfo(event);\n\n return {\n x: _evt.clientX + scroll.left,\n y: _evt.clientY + scroll.top\n };\n };\n\n fabric.util.isTouchEvent = function (event) {\n return touchEvents.indexOf(event.type) > -1 || event.pointerType === 'touch';\n };\n})();\n\n(function () {\n /**\n * Cross-browser wrapper for setting element's style\n * @memberOf fabric.util\n * @param {HTMLElement} element\n * @param {Object} styles\n * @return {HTMLElement} Element that was passed as a first argument\n */\n function setStyle(element, styles) {\n var elementStyle = element.style;\n\n if (!elementStyle) {\n return element;\n }\n\n if (typeof styles === 'string') {\n element.style.cssText += ';' + styles;\n return styles.indexOf('opacity') > -1 ? setOpacity(element, styles.match(/opacity:\\s*(\\d?\\.?\\d*)/)[1]) : element;\n }\n\n for (var property in styles) {\n if (property === 'opacity') {\n setOpacity(element, styles[property]);\n } else {\n var normalizedProperty = property === 'float' || property === 'cssFloat' ? typeof elementStyle.styleFloat === 'undefined' ? 'cssFloat' : 'styleFloat' : property;\n elementStyle[normalizedProperty] = styles[property];\n }\n }\n\n return element;\n }\n\n var parseEl = fabric.document.createElement('div'),\n supportsOpacity = typeof parseEl.style.opacity === 'string',\n supportsFilters = typeof parseEl.style.filter === 'string',\n reOpacity = /alpha\\s*\\(\\s*opacity\\s*=\\s*([^\\)]+)\\)/,\n\n /** @ignore */\n setOpacity = function (element) {\n return element;\n };\n\n if (supportsOpacity) {\n /** @ignore */\n setOpacity = function (element, value) {\n element.style.opacity = value;\n return element;\n };\n } else if (supportsFilters) {\n /** @ignore */\n setOpacity = function (element, value) {\n var es = element.style;\n\n if (element.currentStyle && !element.currentStyle.hasLayout) {\n es.zoom = 1;\n }\n\n if (reOpacity.test(es.filter)) {\n value = value >= 0.9999 ? '' : 'alpha(opacity=' + value * 100 + ')';\n es.filter = es.filter.replace(reOpacity, value);\n } else {\n es.filter += ' alpha(opacity=' + value * 100 + ')';\n }\n\n return element;\n };\n }\n\n fabric.util.setStyle = setStyle;\n})();\n\n(function () {\n var _slice = Array.prototype.slice;\n /**\n * Takes id and returns an element with that id (if one exists in a document)\n * @memberOf fabric.util\n * @param {String|HTMLElement} id\n * @return {HTMLElement|null}\n */\n\n function getById(id) {\n return typeof id === 'string' ? fabric.document.getElementById(id) : id;\n }\n\n var sliceCanConvertNodelists,\n\n /**\n * Converts an array-like object (e.g. arguments or NodeList) to an array\n * @memberOf fabric.util\n * @param {Object} arrayLike\n * @return {Array}\n */\n toArray = function (arrayLike) {\n return _slice.call(arrayLike, 0);\n };\n\n try {\n sliceCanConvertNodelists = toArray(fabric.document.childNodes) instanceof Array;\n } catch (err) {}\n\n if (!sliceCanConvertNodelists) {\n toArray = function (arrayLike) {\n var arr = new Array(arrayLike.length),\n i = arrayLike.length;\n\n while (i--) {\n arr[i] = arrayLike[i];\n }\n\n return arr;\n };\n }\n /**\n * Creates specified element with specified attributes\n * @memberOf fabric.util\n * @param {String} tagName Type of an element to create\n * @param {Object} [attributes] Attributes to set on an element\n * @return {HTMLElement} Newly created element\n */\n\n\n function makeElement(tagName, attributes) {\n var el = fabric.document.createElement(tagName);\n\n for (var prop in attributes) {\n if (prop === 'class') {\n el.className = attributes[prop];\n } else if (prop === 'for') {\n el.htmlFor = attributes[prop];\n } else {\n el.setAttribute(prop, attributes[prop]);\n }\n }\n\n return el;\n }\n /**\n * Adds class to an element\n * @memberOf fabric.util\n * @param {HTMLElement} element Element to add class to\n * @param {String} className Class to add to an element\n */\n\n\n function addClass(element, className) {\n if (element && (' ' + element.className + ' ').indexOf(' ' + className + ' ') === -1) {\n element.className += (element.className ? ' ' : '') + className;\n }\n }\n /**\n * Wraps element with another element\n * @memberOf fabric.util\n * @param {HTMLElement} element Element to wrap\n * @param {HTMLElement|String} wrapper Element to wrap with\n * @param {Object} [attributes] Attributes to set on a wrapper\n * @return {HTMLElement} wrapper\n */\n\n\n function wrapElement(element, wrapper, attributes) {\n if (typeof wrapper === 'string') {\n wrapper = makeElement(wrapper, attributes);\n }\n\n if (element.parentNode) {\n element.parentNode.replaceChild(wrapper, element);\n }\n\n wrapper.appendChild(element);\n return wrapper;\n }\n /**\n * Returns element scroll offsets\n * @memberOf fabric.util\n * @param {HTMLElement} element Element to operate on\n * @return {Object} Object with left/top values\n */\n\n\n function getScrollLeftTop(element) {\n var left = 0,\n top = 0,\n docElement = fabric.document.documentElement,\n body = fabric.document.body || {\n scrollLeft: 0,\n scrollTop: 0\n }; // While loop checks (and then sets element to) .parentNode OR .host\n // to account for ShadowDOM. We still want to traverse up out of ShadowDOM,\n // but the .parentNode of a root ShadowDOM node will always be null, instead\n // it should be accessed through .host. See http://stackoverflow.com/a/24765528/4383938\n\n while (element && (element.parentNode || element.host)) {\n // Set element to element parent, or 'host' in case of ShadowDOM\n element = element.parentNode || element.host;\n\n if (element === fabric.document) {\n left = body.scrollLeft || docElement.scrollLeft || 0;\n top = body.scrollTop || docElement.scrollTop || 0;\n } else {\n left += element.scrollLeft || 0;\n top += element.scrollTop || 0;\n }\n\n if (element.nodeType === 1 && element.style.position === 'fixed') {\n break;\n }\n }\n\n return {\n left: left,\n top: top\n };\n }\n /**\n * Returns offset for a given element\n * @function\n * @memberOf fabric.util\n * @param {HTMLElement} element Element to get offset for\n * @return {Object} Object with \"left\" and \"top\" properties\n */\n\n\n function getElementOffset(element) {\n var docElem,\n doc = element && element.ownerDocument,\n box = {\n left: 0,\n top: 0\n },\n offset = {\n left: 0,\n top: 0\n },\n scrollLeftTop,\n offsetAttributes = {\n borderLeftWidth: 'left',\n borderTopWidth: 'top',\n paddingLeft: 'left',\n paddingTop: 'top'\n };\n\n if (!doc) {\n return offset;\n }\n\n for (var attr in offsetAttributes) {\n offset[offsetAttributes[attr]] += parseInt(getElementStyle(element, attr), 10) || 0;\n }\n\n docElem = doc.documentElement;\n\n if (typeof element.getBoundingClientRect !== 'undefined') {\n box = element.getBoundingClientRect();\n }\n\n scrollLeftTop = getScrollLeftTop(element);\n return {\n left: box.left + scrollLeftTop.left - (docElem.clientLeft || 0) + offset.left,\n top: box.top + scrollLeftTop.top - (docElem.clientTop || 0) + offset.top\n };\n }\n /**\n * Returns style attribute value of a given element\n * @memberOf fabric.util\n * @param {HTMLElement} element Element to get style attribute for\n * @param {String} attr Style attribute to get for element\n * @return {String} Style attribute value of the given element.\n */\n\n\n var getElementStyle;\n\n if (fabric.document.defaultView && fabric.document.defaultView.getComputedStyle) {\n getElementStyle = function (element, attr) {\n var style = fabric.document.defaultView.getComputedStyle(element, null);\n return style ? style[attr] : undefined;\n };\n } else {\n getElementStyle = function (element, attr) {\n var value = element.style[attr];\n\n if (!value && element.currentStyle) {\n value = element.currentStyle[attr];\n }\n\n return value;\n };\n }\n\n (function () {\n var style = fabric.document.documentElement.style,\n selectProp = 'userSelect' in style ? 'userSelect' : 'MozUserSelect' in style ? 'MozUserSelect' : 'WebkitUserSelect' in style ? 'WebkitUserSelect' : 'KhtmlUserSelect' in style ? 'KhtmlUserSelect' : '';\n /**\n * Makes element unselectable\n * @memberOf fabric.util\n * @param {HTMLElement} element Element to make unselectable\n * @return {HTMLElement} Element that was passed in\n */\n\n function makeElementUnselectable(element) {\n if (typeof element.onselectstart !== 'undefined') {\n element.onselectstart = fabric.util.falseFunction;\n }\n\n if (selectProp) {\n element.style[selectProp] = 'none';\n } else if (typeof element.unselectable === 'string') {\n element.unselectable = 'on';\n }\n\n return element;\n }\n /**\n * Makes element selectable\n * @memberOf fabric.util\n * @param {HTMLElement} element Element to make selectable\n * @return {HTMLElement} Element that was passed in\n */\n\n\n function makeElementSelectable(element) {\n if (typeof element.onselectstart !== 'undefined') {\n element.onselectstart = null;\n }\n\n if (selectProp) {\n element.style[selectProp] = '';\n } else if (typeof element.unselectable === 'string') {\n element.unselectable = '';\n }\n\n return element;\n }\n\n fabric.util.makeElementUnselectable = makeElementUnselectable;\n fabric.util.makeElementSelectable = makeElementSelectable;\n })();\n\n function getNodeCanvas(element) {\n var impl = fabric.jsdomImplForWrapper(element);\n return impl._canvas || impl._image;\n }\n\n ;\n\n function cleanUpJsdomNode(element) {\n if (!fabric.isLikelyNode) {\n return;\n }\n\n var impl = fabric.jsdomImplForWrapper(element);\n\n if (impl) {\n impl._image = null;\n impl._canvas = null; // unsure if necessary\n\n impl._currentSrc = null;\n impl._attributes = null;\n impl._classList = null;\n }\n }\n\n function setImageSmoothing(ctx, value) {\n ctx.imageSmoothingEnabled = ctx.imageSmoothingEnabled || ctx.webkitImageSmoothingEnabled || ctx.mozImageSmoothingEnabled || ctx.msImageSmoothingEnabled || ctx.oImageSmoothingEnabled;\n ctx.imageSmoothingEnabled = value;\n }\n /**\n * setImageSmoothing sets the context imageSmoothingEnabled property.\n * Used by canvas and by ImageObject.\n * @memberOf fabric.util\n * @since 4.0.0\n * @param {HTMLRenderingContext2D} ctx to set on\n * @param {Boolean} value true or false\n */\n\n\n fabric.util.setImageSmoothing = setImageSmoothing;\n fabric.util.getById = getById;\n fabric.util.toArray = toArray;\n fabric.util.addClass = addClass;\n fabric.util.makeElement = makeElement;\n fabric.util.wrapElement = wrapElement;\n fabric.util.getScrollLeftTop = getScrollLeftTop;\n fabric.util.getElementOffset = getElementOffset;\n fabric.util.getNodeCanvas = getNodeCanvas;\n fabric.util.cleanUpJsdomNode = cleanUpJsdomNode;\n})();\n\n(function () {\n function addParamToUrl(url, param) {\n return url + (/\\?/.test(url) ? '&' : '?') + param;\n }\n\n function emptyFn() {}\n /**\n * Cross-browser abstraction for sending XMLHttpRequest\n * @memberOf fabric.util\n * @param {String} url URL to send XMLHttpRequest to\n * @param {Object} [options] Options object\n * @param {String} [options.method=\"GET\"]\n * @param {String} [options.parameters] parameters to append to url in GET or in body\n * @param {String} [options.body] body to send with POST or PUT request\n * @param {Function} options.onComplete Callback to invoke when request is completed\n * @return {XMLHttpRequest} request\n */\n\n\n function request(url, options) {\n options || (options = {});\n\n var method = options.method ? options.method.toUpperCase() : 'GET',\n onComplete = options.onComplete || function () {},\n xhr = new fabric.window.XMLHttpRequest(),\n body = options.body || options.parameters;\n /** @ignore */\n\n\n xhr.onreadystatechange = function () {\n if (xhr.readyState === 4) {\n onComplete(xhr);\n xhr.onreadystatechange = emptyFn;\n }\n };\n\n if (method === 'GET') {\n body = null;\n\n if (typeof options.parameters === 'string') {\n url = addParamToUrl(url, options.parameters);\n }\n }\n\n xhr.open(method, url, true);\n\n if (method === 'POST' || method === 'PUT') {\n xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');\n }\n\n xhr.send(body);\n return xhr;\n }\n\n fabric.util.request = request;\n})();\n/**\n * Wrapper around `console.log` (when available)\n * @param {*} [values] Values to log\n */\n\n\nfabric.log = console.log;\n/**\n * Wrapper around `console.warn` (when available)\n * @param {*} [values] Values to log as a warning\n */\n\nfabric.warn = console.warn;\n\n(function () {\n function noop() {\n return false;\n }\n\n function defaultEasing(t, b, c, d) {\n return -c * Math.cos(t / d * (Math.PI / 2)) + c + b;\n }\n /**\n * Changes value from one to another within certain period of time, invoking callbacks as value is being changed.\n * @memberOf fabric.util\n * @param {Object} [options] Animation options\n * @param {Function} [options.onChange] Callback; invoked on every value change\n * @param {Function} [options.onComplete] Callback; invoked when value change is completed\n * @param {Number} [options.startValue=0] Starting value\n * @param {Number} [options.endValue=100] Ending value\n * @param {Number} [options.byValue=100] Value to modify the property by\n * @param {Function} [options.easing] Easing function\n * @param {Number} [options.duration=500] Duration of change (in ms)\n * @param {Function} [options.abort] Additional function with logic. If returns true, onComplete is called.\n */\n\n\n function animate(options) {\n requestAnimFrame(function (timestamp) {\n options || (options = {});\n var start = timestamp || +new Date(),\n duration = options.duration || 500,\n finish = start + duration,\n time,\n onChange = options.onChange || noop,\n abort = options.abort || noop,\n onComplete = options.onComplete || noop,\n easing = options.easing || defaultEasing,\n startValue = 'startValue' in options ? options.startValue : 0,\n endValue = 'endValue' in options ? options.endValue : 100,\n byValue = options.byValue || endValue - startValue;\n options.onStart && options.onStart();\n\n (function tick(ticktime) {\n // TODO: move abort call after calculation\n // and pass (current,valuePerc, timePerc) as arguments\n time = ticktime || +new Date();\n var currentTime = time > finish ? duration : time - start,\n timePerc = currentTime / duration,\n current = easing(currentTime, startValue, byValue, duration),\n valuePerc = Math.abs((current - startValue) / byValue);\n\n if (abort()) {\n onComplete(endValue, 1, 1);\n return;\n }\n\n if (time > finish) {\n onChange(endValue, 1, 1);\n onComplete(endValue, 1, 1);\n return;\n } else {\n onChange(current, valuePerc, timePerc);\n requestAnimFrame(tick);\n }\n })(start);\n });\n }\n\n var _requestAnimFrame = fabric.window.requestAnimationFrame || fabric.window.webkitRequestAnimationFrame || fabric.window.mozRequestAnimationFrame || fabric.window.oRequestAnimationFrame || fabric.window.msRequestAnimationFrame || function (callback) {\n return fabric.window.setTimeout(callback, 1000 / 60);\n };\n\n var _cancelAnimFrame = fabric.window.cancelAnimationFrame || fabric.window.clearTimeout;\n /**\n * requestAnimationFrame polyfill based on http://paulirish.com/2011/requestanimationframe-for-smart-animating/\n * In order to get a precise start time, `requestAnimFrame` should be called as an entry into the method\n * @memberOf fabric.util\n * @param {Function} callback Callback to invoke\n * @param {DOMElement} element optional Element to associate with animation\n */\n\n\n function requestAnimFrame() {\n return _requestAnimFrame.apply(fabric.window, arguments);\n }\n\n function cancelAnimFrame() {\n return _cancelAnimFrame.apply(fabric.window, arguments);\n }\n\n fabric.util.animate = animate;\n fabric.util.requestAnimFrame = requestAnimFrame;\n fabric.util.cancelAnimFrame = cancelAnimFrame;\n})();\n\n(function () {\n // Calculate an in-between color. Returns a \"rgba()\" string.\n // Credit: Edwin Martin <edwin@bitstorm.org>\n // http://www.bitstorm.org/jquery/color-animation/jquery.animate-colors.js\n function calculateColor(begin, end, pos) {\n var color = 'rgba(' + parseInt(begin[0] + pos * (end[0] - begin[0]), 10) + ',' + parseInt(begin[1] + pos * (end[1] - begin[1]), 10) + ',' + parseInt(begin[2] + pos * (end[2] - begin[2]), 10);\n color += ',' + (begin && end ? parseFloat(begin[3] + pos * (end[3] - begin[3])) : 1);\n color += ')';\n return color;\n }\n /**\n * Changes the color from one to another within certain period of time, invoking callbacks as value is being changed.\n * @memberOf fabric.util\n * @param {String} fromColor The starting color in hex or rgb(a) format.\n * @param {String} toColor The starting color in hex or rgb(a) format.\n * @param {Number} [duration] Duration of change (in ms).\n * @param {Object} [options] Animation options\n * @param {Function} [options.onChange] Callback; invoked on every value change\n * @param {Function} [options.onComplete] Callback; invoked when value change is completed\n * @param {Function} [options.colorEasing] Easing function. Note that this function only take two arguments (currentTime, duration). Thus the regular animation easing functions cannot be used.\n * @param {Function} [options.abort] Additional function with logic. If returns true, onComplete is called.\n */\n\n\n function animateColor(fromColor, toColor, duration, options) {\n var startColor = new fabric.Color(fromColor).getSource(),\n endColor = new fabric.Color(toColor).getSource(),\n originalOnComplete = options.onComplete,\n originalOnChange = options.onChange;\n options = options || {};\n fabric.util.animate(fabric.util.object.extend(options, {\n duration: duration || 500,\n startValue: startColor,\n endValue: endColor,\n byValue: endColor,\n easing: function (currentTime, startValue, byValue, duration) {\n var posValue = options.colorEasing ? options.colorEasing(currentTime, duration) : 1 - Math.cos(currentTime / duration * (Math.PI / 2));\n return calculateColor(startValue, byValue, posValue);\n },\n // has to take in account for color restoring;\n onComplete: function (current, valuePerc, timePerc) {\n if (originalOnComplete) {\n return originalOnComplete(calculateColor(endColor, endColor, 0), valuePerc, timePerc);\n }\n },\n onChange: function (current, valuePerc, timePerc) {\n if (originalOnChange) {\n if (Array.isArray(current)) {\n return originalOnChange(calculateColor(current, current, 0), valuePerc, timePerc);\n }\n\n originalOnChange(current, valuePerc, timePerc);\n }\n }\n }));\n }\n\n fabric.util.animateColor = animateColor;\n})();\n\n(function () {\n function normalize(a, c, p, s) {\n if (a < Math.abs(c)) {\n a = c;\n s = p / 4;\n } else {\n //handle the 0/0 case:\n if (c === 0 && a === 0) {\n s = p / (2 * Math.PI) * Math.asin(1);\n } else {\n s = p / (2 * Math.PI) * Math.asin(c / a);\n }\n }\n\n return {\n a: a,\n c: c,\n p: p,\n s: s\n };\n }\n\n function elastic(opts, t, d) {\n return opts.a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t * d - opts.s) * (2 * Math.PI) / opts.p);\n }\n /**\n * Cubic easing out\n * @memberOf fabric.util.ease\n */\n\n\n function easeOutCubic(t, b, c, d) {\n return c * ((t = t / d - 1) * t * t + 1) + b;\n }\n /**\n * Cubic easing in and out\n * @memberOf fabric.util.ease\n */\n\n\n function easeInOutCubic(t, b, c, d) {\n t /= d / 2;\n\n if (t < 1) {\n return c / 2 * t * t * t + b;\n }\n\n return c / 2 * ((t -= 2) * t * t + 2) + b;\n }\n /**\n * Quartic easing in\n * @memberOf fabric.util.ease\n */\n\n\n function easeInQuart(t, b, c, d) {\n return c * (t /= d) * t * t * t + b;\n }\n /**\n * Quartic easing out\n * @memberOf fabric.util.ease\n */\n\n\n function easeOutQuart(t, b, c, d) {\n return -c * ((t = t / d - 1) * t * t * t - 1) + b;\n }\n /**\n * Quartic easing in and out\n * @memberOf fabric.util.ease\n */\n\n\n function easeInOutQuart(t, b, c, d) {\n t /= d / 2;\n\n if (t < 1) {\n return c / 2 * t * t * t * t + b;\n }\n\n return -c / 2 * ((t -= 2) * t * t * t - 2) + b;\n }\n /**\n * Quintic easing in\n * @memberOf fabric.util.ease\n */\n\n\n function easeInQuint(t, b, c, d) {\n return c * (t /= d) * t * t * t * t + b;\n }\n /**\n * Quintic easing out\n * @memberOf fabric.util.ease\n */\n\n\n function easeOutQuint(t, b, c, d) {\n return c * ((t = t / d - 1) * t * t * t * t + 1) + b;\n }\n /**\n * Quintic easing in and out\n * @memberOf fabric.util.ease\n */\n\n\n function easeInOutQuint(t, b, c, d) {\n t /= d / 2;\n\n if (t < 1) {\n return c / 2 * t * t * t * t * t + b;\n }\n\n return c / 2 * ((t -= 2) * t * t * t * t + 2) + b;\n }\n /**\n * Sinusoidal easing in\n * @memberOf fabric.util.ease\n */\n\n\n function easeInSine(t, b, c, d) {\n return -c * Math.cos(t / d * (Math.PI / 2)) + c + b;\n }\n /**\n * Sinusoidal easing out\n * @memberOf fabric.util.ease\n */\n\n\n function easeOutSine(t, b, c, d) {\n return c * Math.sin(t / d * (Math.PI / 2)) + b;\n }\n /**\n * Sinusoidal easing in and out\n * @memberOf fabric.util.ease\n */\n\n\n function easeInOutSine(t, b, c, d) {\n return -c / 2 * (Math.cos(Math.PI * t / d) - 1) + b;\n }\n /**\n * Exponential easing in\n * @memberOf fabric.util.ease\n */\n\n\n function easeInExpo(t, b, c, d) {\n return t === 0 ? b : c * Math.pow(2, 10 * (t / d - 1)) + b;\n }\n /**\n * Exponential easing out\n * @memberOf fabric.util.ease\n */\n\n\n function easeOutExpo(t, b, c, d) {\n return t === d ? b + c : c * (-Math.pow(2, -10 * t / d) + 1) + b;\n }\n /**\n * Exponential easing in and out\n * @memberOf fabric.util.ease\n */\n\n\n function easeInOutExpo(t, b, c, d) {\n if (t === 0) {\n return b;\n }\n\n if (t === d) {\n return b + c;\n }\n\n t /= d / 2;\n\n if (t < 1) {\n return c / 2 * Math.pow(2, 10 * (t - 1)) + b;\n }\n\n return c / 2 * (-Math.pow(2, -10 * --t) + 2) + b;\n }\n /**\n * Circular easing in\n * @memberOf fabric.util.ease\n */\n\n\n function easeInCirc(t, b, c, d) {\n return -c * (Math.sqrt(1 - (t /= d) * t) - 1) + b;\n }\n /**\n * Circular easing out\n * @memberOf fabric.util.ease\n */\n\n\n function easeOutCirc(t, b, c, d) {\n return c * Math.sqrt(1 - (t = t / d - 1) * t) + b;\n }\n /**\n * Circular easing in and out\n * @memberOf fabric.util.ease\n */\n\n\n function easeInOutCirc(t, b, c, d) {\n t /= d / 2;\n\n if (t < 1) {\n return -c / 2 * (Math.sqrt(1 - t * t) - 1) + b;\n }\n\n return c / 2 * (Math.sqrt(1 - (t -= 2) * t) + 1) + b;\n }\n /**\n * Elastic easing in\n * @memberOf fabric.util.ease\n */\n\n\n function easeInElastic(t, b, c, d) {\n var s = 1.70158,\n p = 0,\n a = c;\n\n if (t === 0) {\n return b;\n }\n\n t /= d;\n\n if (t === 1) {\n return b + c;\n }\n\n if (!p) {\n p = d * 0.3;\n }\n\n var opts = normalize(a, c, p, s);\n return -elastic(opts, t, d) + b;\n }\n /**\n * Elastic easing out\n * @memberOf fabric.util.ease\n */\n\n\n function easeOutElastic(t, b, c, d) {\n var s = 1.70158,\n p = 0,\n a = c;\n\n if (t === 0) {\n return b;\n }\n\n t /= d;\n\n if (t === 1) {\n return b + c;\n }\n\n if (!p) {\n p = d * 0.3;\n }\n\n var opts = normalize(a, c, p, s);\n return opts.a * Math.pow(2, -10 * t) * Math.sin((t * d - opts.s) * (2 * Math.PI) / opts.p) + opts.c + b;\n }\n /**\n * Elastic easing in and out\n * @memberOf fabric.util.ease\n */\n\n\n function easeInOutElastic(t, b, c, d) {\n var s = 1.70158,\n p = 0,\n a = c;\n\n if (t === 0) {\n return b;\n }\n\n t /= d / 2;\n\n if (t === 2) {\n return b + c;\n }\n\n if (!p) {\n p = d * (0.3 * 1.5);\n }\n\n var opts = normalize(a, c, p, s);\n\n if (t < 1) {\n return -0.5 * elastic(opts, t, d) + b;\n }\n\n return opts.a * Math.pow(2, -10 * (t -= 1)) * Math.sin((t * d - opts.s) * (2 * Math.PI) / opts.p) * 0.5 + opts.c + b;\n }\n /**\n * Backwards easing in\n * @memberOf fabric.util.ease\n */\n\n\n function easeInBack(t, b, c, d, s) {\n if (s === undefined) {\n s = 1.70158;\n }\n\n return c * (t /= d) * t * ((s + 1) * t - s) + b;\n }\n /**\n * Backwards easing out\n * @memberOf fabric.util.ease\n */\n\n\n function easeOutBack(t, b, c, d, s) {\n if (s === undefined) {\n s = 1.70158;\n }\n\n return c * ((t = t / d - 1) * t * ((s + 1) * t + s) + 1) + b;\n }\n /**\n * Backwards easing in and out\n * @memberOf fabric.util.ease\n */\n\n\n function easeInOutBack(t, b, c, d, s) {\n if (s === undefined) {\n s = 1.70158;\n }\n\n t /= d / 2;\n\n if (t < 1) {\n return c / 2 * (t * t * (((s *= 1.525) + 1) * t - s)) + b;\n }\n\n return c / 2 * ((t -= 2) * t * (((s *= 1.525) + 1) * t + s) + 2) + b;\n }\n /**\n * Bouncing easing in\n * @memberOf fabric.util.ease\n */\n\n\n function easeInBounce(t, b, c, d) {\n return c - easeOutBounce(d - t, 0, c, d) + b;\n }\n /**\n * Bouncing easing out\n * @memberOf fabric.util.ease\n */\n\n\n function easeOutBounce(t, b, c, d) {\n if ((t /= d) < 1 / 2.75) {\n return c * (7.5625 * t * t) + b;\n } else if (t < 2 / 2.75) {\n return c * (7.5625 * (t -= 1.5 / 2.75) * t + 0.75) + b;\n } else if (t < 2.5 / 2.75) {\n return c * (7.5625 * (t -= 2.25 / 2.75) * t + 0.9375) + b;\n } else {\n return c * (7.5625 * (t -= 2.625 / 2.75) * t + 0.984375) + b;\n }\n }\n /**\n * Bouncing easing in and out\n * @memberOf fabric.util.ease\n */\n\n\n function easeInOutBounce(t, b, c, d) {\n if (t < d / 2) {\n return easeInBounce(t * 2, 0, c, d) * 0.5 + b;\n }\n\n return easeOutBounce(t * 2 - d, 0, c, d) * 0.5 + c * 0.5 + b;\n }\n /**\n * Easing functions\n * See <a href=\"http://gizma.com/easing/\">Easing Equations by Robert Penner</a>\n * @namespace fabric.util.ease\n */\n\n\n fabric.util.ease = {\n /**\n * Quadratic easing in\n * @memberOf fabric.util.ease\n */\n easeInQuad: function (t, b, c, d) {\n return c * (t /= d) * t + b;\n },\n\n /**\n * Quadratic easing out\n * @memberOf fabric.util.ease\n */\n easeOutQuad: function (t, b, c, d) {\n return -c * (t /= d) * (t - 2) + b;\n },\n\n /**\n * Quadratic easing in and out\n * @memberOf fabric.util.ease\n */\n easeInOutQuad: function (t, b, c, d) {\n t /= d / 2;\n\n if (t < 1) {\n return c / 2 * t * t + b;\n }\n\n return -c / 2 * (--t * (t - 2) - 1) + b;\n },\n\n /**\n * Cubic easing in\n * @memberOf fabric.util.ease\n */\n easeInCubic: function (t, b, c, d) {\n return c * (t /= d) * t * t + b;\n },\n easeOutCubic: easeOutCubic,\n easeInOutCubic: easeInOutCubic,\n easeInQuart: easeInQuart,\n easeOutQuart: easeOutQuart,\n easeInOutQuart: easeInOutQuart,\n easeInQuint: easeInQuint,\n easeOutQuint: easeOutQuint,\n easeInOutQuint: easeInOutQuint,\n easeInSine: easeInSine,\n easeOutSine: easeOutSine,\n easeInOutSine: easeInOutSine,\n easeInExpo: easeInExpo,\n easeOutExpo: easeOutExpo,\n easeInOutExpo: easeInOutExpo,\n easeInCirc: easeInCirc,\n easeOutCirc: easeOutCirc,\n easeInOutCirc: easeInOutCirc,\n easeInElastic: easeInElastic,\n easeOutElastic: easeOutElastic,\n easeInOutElastic: easeInOutElastic,\n easeInBack: easeInBack,\n easeOutBack: easeOutBack,\n easeInOutBack: easeInOutBack,\n easeInBounce: easeInBounce,\n easeOutBounce: easeOutBounce,\n easeInOutBounce: easeInOutBounce\n };\n})();\n\n(function (global) {\n 'use strict';\n /**\n * @name fabric\n * @namespace\n */\n\n var fabric = global.fabric || (global.fabric = {}),\n extend = fabric.util.object.extend,\n clone = fabric.util.object.clone,\n toFixed = fabric.util.toFixed,\n parseUnit = fabric.util.parseUnit,\n multiplyTransformMatrices = fabric.util.multiplyTransformMatrices,\n svgValidTagNames = ['path', 'circle', 'polygon', 'polyline', 'ellipse', 'rect', 'line', 'image', 'text'],\n svgViewBoxElements = ['symbol', 'image', 'marker', 'pattern', 'view', 'svg'],\n svgInvalidAncestors = ['pattern', 'defs', 'symbol', 'metadata', 'clipPath', 'mask', 'desc'],\n svgValidParents = ['symbol', 'g', 'a', 'svg', 'clipPath', 'defs'],\n attributesMap = {\n cx: 'left',\n x: 'left',\n r: 'radius',\n cy: 'top',\n y: 'top',\n display: 'visible',\n visibility: 'visible',\n transform: 'transformMatrix',\n 'fill-opacity': 'fillOpacity',\n 'fill-rule': 'fillRule',\n 'font-family': 'fontFamily',\n 'font-size': 'fontSize',\n 'font-style': 'fontStyle',\n 'font-weight': 'fontWeight',\n 'letter-spacing': 'charSpacing',\n 'paint-order': 'paintFirst',\n 'stroke-dasharray': 'strokeDashArray',\n 'stroke-dashoffset': 'strokeDashOffset',\n 'stroke-linecap': 'strokeLineCap',\n 'stroke-linejoin': 'strokeLineJoin',\n 'stroke-miterlimit': 'strokeMiterLimit',\n 'stroke-opacity': 'strokeOpacity',\n 'stroke-width': 'strokeWidth',\n 'text-decoration': 'textDecoration',\n 'text-anchor': 'textAnchor',\n opacity: 'opacity',\n 'clip-path': 'clipPath',\n 'clip-rule': 'clipRule',\n 'vector-effect': 'strokeUniform',\n 'image-rendering': 'imageSmoothing'\n },\n colorAttributes = {\n stroke: 'strokeOpacity',\n fill: 'fillOpacity'\n },\n fSize = 'font-size',\n cPath = 'clip-path';\n fabric.svgValidTagNamesRegEx = getSvgRegex(svgValidTagNames);\n fabric.svgViewBoxElementsRegEx = getSvgRegex(svgViewBoxElements);\n fabric.svgInvalidAncestorsRegEx = getSvgRegex(svgInvalidAncestors);\n fabric.svgValidParentsRegEx = getSvgRegex(svgValidParents);\n fabric.cssRules = {};\n fabric.gradientDefs = {};\n fabric.clipPaths = {};\n\n function normalizeAttr(attr) {\n // transform attribute names\n if (attr in attributesMap) {\n return attributesMap[attr];\n }\n\n return attr;\n }\n\n function normalizeValue(attr, value, parentAttributes, fontSize) {\n var isArray = Object.prototype.toString.call(value) === '[object Array]',\n parsed;\n\n if ((attr === 'fill' || attr === 'stroke') && value === 'none') {\n value = '';\n } else if (attr === 'strokeUniform') {\n return value === 'non-scaling-stroke';\n } else if (attr === 'strokeDashArray') {\n if (value === 'none') {\n value = null;\n } else {\n value = value.replace(/,/g, ' ').split(/\\s+/).map(parseFloat);\n }\n } else if (attr === 'transformMatrix') {\n if (parentAttributes && parentAttributes.transformMatrix) {\n value = multiplyTransformMatrices(parentAttributes.transformMatrix, fabric.parseTransformAttribute(value));\n } else {\n value = fabric.parseTransformAttribute(value);\n }\n } else if (attr === 'visible') {\n value = value !== 'none' && value !== 'hidden'; // display=none on parent element always takes precedence over child element\n\n if (parentAttributes && parentAttributes.visible === false) {\n value = false;\n }\n } else if (attr === 'opacity') {\n value = parseFloat(value);\n\n if (parentAttributes && typeof parentAttributes.opacity !== 'undefined') {\n value *= parentAttributes.opacity;\n }\n } else if (attr === 'textAnchor'\n /* text-anchor */\n ) {\n value = value === 'start' ? 'left' : value === 'end' ? 'right' : 'center';\n } else if (attr === 'charSpacing') {\n // parseUnit returns px and we convert it to em\n parsed = parseUnit(value, fontSize) / fontSize * 1000;\n } else if (attr === 'paintFirst') {\n var fillIndex = value.indexOf('fill');\n var strokeIndex = value.indexOf('stroke');\n var value = 'fill';\n\n if (fillIndex > -1 && strokeIndex > -1 && strokeIndex < fillIndex) {\n value = 'stroke';\n } else if (fillIndex === -1 && strokeIndex > -1) {\n value = 'stroke';\n }\n } else if (attr === 'href' || attr === 'xlink:href' || attr === 'font') {\n return value;\n } else if (attr === 'imageSmoothing') {\n return value === 'optimizeQuality' ? true : false;\n } else {\n parsed = isArray ? value.map(parseUnit) : parseUnit(value, fontSize);\n }\n\n return !isArray && isNaN(parsed) ? value : parsed;\n }\n /**\n * @private\n */\n\n\n function getSvgRegex(arr) {\n return new RegExp('^(' + arr.join('|') + ')\\\\b', 'i');\n }\n /**\n * @private\n * @param {Object} attributes Array of attributes to parse\n */\n\n\n function _setStrokeFillOpacity(attributes) {\n for (var attr in colorAttributes) {\n if (typeof attributes[colorAttributes[attr]] === 'undefined' || attributes[attr] === '') {\n continue;\n }\n\n if (typeof attributes[attr] === 'undefined') {\n if (!fabric.Object.prototype[attr]) {\n continue;\n }\n\n attributes[attr] = fabric.Object.prototype[attr];\n }\n\n if (attributes[attr].indexOf('url(') === 0) {\n continue;\n }\n\n var color = new fabric.Color(attributes[attr]);\n attributes[attr] = color.setAlpha(toFixed(color.getAlpha() * attributes[colorAttributes[attr]], 2)).toRgba();\n }\n\n return attributes;\n }\n /**\n * @private\n */\n\n\n function _getMultipleNodes(doc, nodeNames) {\n var nodeName,\n nodeArray = [],\n nodeList,\n i,\n len;\n\n for (i = 0, len = nodeNames.length; i < len; i++) {\n nodeName = nodeNames[i];\n nodeList = doc.getElementsByTagName(nodeName);\n nodeArray = nodeArray.concat(Array.prototype.slice.call(nodeList));\n }\n\n return nodeArray;\n }\n /**\n * Parses \"transform\" attribute, returning an array of values\n * @static\n * @function\n * @memberOf fabric\n * @param {String} attributeValue String containing attribute value\n * @return {Array} Array of 6 elements representing transformation matrix\n */\n\n\n fabric.parseTransformAttribute = function () {\n function rotateMatrix(matrix, args) {\n var cos = fabric.util.cos(args[0]),\n sin = fabric.util.sin(args[0]),\n x = 0,\n y = 0;\n\n if (args.length === 3) {\n x = args[1];\n y = args[2];\n }\n\n matrix[0] = cos;\n matrix[1] = sin;\n matrix[2] = -sin;\n matrix[3] = cos;\n matrix[4] = x - (cos * x - sin * y);\n matrix[5] = y - (sin * x + cos * y);\n }\n\n function scaleMatrix(matrix, args) {\n var multiplierX = args[0],\n multiplierY = args.length === 2 ? args[1] : args[0];\n matrix[0] = multiplierX;\n matrix[3] = multiplierY;\n }\n\n function skewMatrix(matrix, args, pos) {\n matrix[pos] = Math.tan(fabric.util.degreesToRadians(args[0]));\n }\n\n function translateMatrix(matrix, args) {\n matrix[4] = args[0];\n\n if (args.length === 2) {\n matrix[5] = args[1];\n }\n } // identity matrix\n\n\n var iMatrix = fabric.iMatrix,\n // == begin transform regexp\n number = fabric.reNum,\n commaWsp = fabric.commaWsp,\n skewX = '(?:(skewX)\\\\s*\\\\(\\\\s*(' + number + ')\\\\s*\\\\))',\n skewY = '(?:(skewY)\\\\s*\\\\(\\\\s*(' + number + ')\\\\s*\\\\))',\n rotate = '(?:(rotate)\\\\s*\\\\(\\\\s*(' + number + ')(?:' + commaWsp + '(' + number + ')' + commaWsp + '(' + number + '))?\\\\s*\\\\))',\n scale = '(?:(scale)\\\\s*\\\\(\\\\s*(' + number + ')(?:' + commaWsp + '(' + number + '))?\\\\s*\\\\))',\n translate = '(?:(translate)\\\\s*\\\\(\\\\s*(' + number + ')(?:' + commaWsp + '(' + number + '))?\\\\s*\\\\))',\n matrix = '(?:(matrix)\\\\s*\\\\(\\\\s*' + '(' + number + ')' + commaWsp + '(' + number + ')' + commaWsp + '(' + number + ')' + commaWsp + '(' + number + ')' + commaWsp + '(' + number + ')' + commaWsp + '(' + number + ')' + '\\\\s*\\\\))',\n transform = '(?:' + matrix + '|' + translate + '|' + scale + '|' + rotate + '|' + skewX + '|' + skewY + ')',\n transforms = '(?:' + transform + '(?:' + commaWsp + '*' + transform + ')*' + ')',\n transformList = '^\\\\s*(?:' + transforms + '?)\\\\s*$',\n // http://www.w3.org/TR/SVG/coords.html#TransformAttribute\n reTransformList = new RegExp(transformList),\n // == end transform regexp\n reTransform = new RegExp(transform, 'g');\n return function (attributeValue) {\n // start with identity matrix\n var matrix = iMatrix.concat(),\n matrices = []; // return if no argument was given or\n // an argument does not match transform attribute regexp\n\n if (!attributeValue || attributeValue && !reTransformList.test(attributeValue)) {\n return matrix;\n }\n\n attributeValue.replace(reTransform, function (match) {\n var m = new RegExp(transform).exec(match).filter(function (match) {\n // match !== '' && match != null\n return !!match;\n }),\n operation = m[1],\n args = m.slice(2).map(parseFloat);\n\n switch (operation) {\n case 'translate':\n translateMatrix(matrix, args);\n break;\n\n case 'rotate':\n args[0] = fabric.util.degreesToRadians(args[0]);\n rotateMatrix(matrix, args);\n break;\n\n case 'scale':\n scaleMatrix(matrix, args);\n break;\n\n case 'skewX':\n skewMatrix(matrix, args, 2);\n break;\n\n case 'skewY':\n skewMatrix(matrix, args, 1);\n break;\n\n case 'matrix':\n matrix = args;\n break;\n } // snapshot current matrix into matrices array\n\n\n matrices.push(matrix.concat()); // reset\n\n matrix = iMatrix.concat();\n });\n var combinedMatrix = matrices[0];\n\n while (matrices.length > 1) {\n matrices.shift();\n combinedMatrix = fabric.util.multiplyTransformMatrices(combinedMatrix, matrices[0]);\n }\n\n return combinedMatrix;\n };\n }();\n /**\n * @private\n */\n\n\n function parseStyleString(style, oStyle) {\n var attr, value;\n style.replace(/;\\s*$/, '').split(';').forEach(function (chunk) {\n var pair = chunk.split(':');\n attr = pair[0].trim().toLowerCase();\n value = pair[1].trim();\n oStyle[attr] = value;\n });\n }\n /**\n * @private\n */\n\n\n function parseStyleObject(style, oStyle) {\n var attr, value;\n\n for (var prop in style) {\n if (typeof style[prop] === 'undefined') {\n continue;\n }\n\n attr = prop.toLowerCase();\n value = style[prop];\n oStyle[attr] = value;\n }\n }\n /**\n * @private\n */\n\n\n function getGlobalStylesForElement(element, svgUid) {\n var styles = {};\n\n for (var rule in fabric.cssRules[svgUid]) {\n if (elementMatchesRule(element, rule.split(' '))) {\n for (var property in fabric.cssRules[svgUid][rule]) {\n styles[property] = fabric.cssRules[svgUid][rule][property];\n }\n }\n }\n\n return styles;\n }\n /**\n * @private\n */\n\n\n function elementMatchesRule(element, selectors) {\n var firstMatching,\n parentMatching = true; //start from rightmost selector.\n\n firstMatching = selectorMatches(element, selectors.pop());\n\n if (firstMatching && selectors.length) {\n parentMatching = doesSomeParentMatch(element, selectors);\n }\n\n return firstMatching && parentMatching && selectors.length === 0;\n }\n\n function doesSomeParentMatch(element, selectors) {\n var selector,\n parentMatching = true;\n\n while (element.parentNode && element.parentNode.nodeType === 1 && selectors.length) {\n if (parentMatching) {\n selector = selectors.pop();\n }\n\n element = element.parentNode;\n parentMatching = selectorMatches(element, selector);\n }\n\n return selectors.length === 0;\n }\n /**\n * @private\n */\n\n\n function selectorMatches(element, selector) {\n var nodeName = element.nodeName,\n classNames = element.getAttribute('class'),\n id = element.getAttribute('id'),\n matcher,\n i; // i check if a selector matches slicing away part from it.\n // if i get empty string i should match\n\n matcher = new RegExp('^' + nodeName, 'i');\n selector = selector.replace(matcher, '');\n\n if (id && selector.length) {\n matcher = new RegExp('#' + id + '(?![a-zA-Z\\\\-]+)', 'i');\n selector = selector.replace(matcher, '');\n }\n\n if (classNames && selector.length) {\n classNames = classNames.split(' ');\n\n for (i = classNames.length; i--;) {\n matcher = new RegExp('\\\\.' + classNames[i] + '(?![a-zA-Z\\\\-]+)', 'i');\n selector = selector.replace(matcher, '');\n }\n }\n\n return selector.length === 0;\n }\n /**\n * @private\n * to support IE8 missing getElementById on SVGdocument and on node xmlDOM\n */\n\n\n function elementById(doc, id) {\n var el;\n doc.getElementById && (el = doc.getElementById(id));\n\n if (el) {\n return el;\n }\n\n var node,\n i,\n len,\n nodelist = doc.getElementsByTagName('*');\n\n for (i = 0, len = nodelist.length; i < len; i++) {\n node = nodelist[i];\n\n if (id === node.getAttribute('id')) {\n return node;\n }\n }\n }\n /**\n * @private\n */\n\n\n function parseUseDirectives(doc) {\n var nodelist = _getMultipleNodes(doc, ['use', 'svg:use']),\n i = 0;\n\n while (nodelist.length && i < nodelist.length) {\n var el = nodelist[i],\n xlink = (el.getAttribute('xlink:href') || el.getAttribute('href')).substr(1),\n x = el.getAttribute('x') || 0,\n y = el.getAttribute('y') || 0,\n el2 = elementById(doc, xlink).cloneNode(true),\n currentTrans = (el2.getAttribute('transform') || '') + ' translate(' + x + ', ' + y + ')',\n parentNode,\n oldLength = nodelist.length,\n attr,\n j,\n attrs,\n len,\n namespace = fabric.svgNS;\n applyViewboxTransform(el2);\n\n if (/^svg$/i.test(el2.nodeName)) {\n var el3 = el2.ownerDocument.createElementNS(namespace, 'g');\n\n for (j = 0, attrs = el2.attributes, len = attrs.length; j < len; j++) {\n attr = attrs.item(j);\n el3.setAttributeNS(namespace, attr.nodeName, attr.nodeValue);\n } // el2.firstChild != null\n\n\n while (el2.firstChild) {\n el3.appendChild(el2.firstChild);\n }\n\n el2 = el3;\n }\n\n for (j = 0, attrs = el.attributes, len = attrs.length; j < len; j++) {\n attr = attrs.item(j);\n\n if (attr.nodeName === 'x' || attr.nodeName === 'y' || attr.nodeName === 'xlink:href' || attr.nodeName === 'href') {\n continue;\n }\n\n if (attr.nodeName === 'transform') {\n currentTrans = attr.nodeValue + ' ' + currentTrans;\n } else {\n el2.setAttribute(attr.nodeName, attr.nodeValue);\n }\n }\n\n el2.setAttribute('transform', currentTrans);\n el2.setAttribute('instantiated_by_use', '1');\n el2.removeAttribute('id');\n parentNode = el.parentNode;\n parentNode.replaceChild(el2, el); // some browsers do not shorten nodelist after replaceChild (IE8)\n\n if (nodelist.length === oldLength) {\n i++;\n }\n }\n } // http://www.w3.org/TR/SVG/coords.html#ViewBoxAttribute\n // matches, e.g.: +14.56e-12, etc.\n\n\n var reViewBoxAttrValue = new RegExp('^' + '\\\\s*(' + fabric.reNum + '+)\\\\s*,?' + '\\\\s*(' + fabric.reNum + '+)\\\\s*,?' + '\\\\s*(' + fabric.reNum + '+)\\\\s*,?' + '\\\\s*(' + fabric.reNum + '+)\\\\s*' + '$');\n /**\n * Add a <g> element that envelop all child elements and makes the viewbox transformMatrix descend on all elements\n */\n\n function applyViewboxTransform(element) {\n if (!fabric.svgViewBoxElementsRegEx.test(element.nodeName)) {\n return;\n }\n\n var viewBoxAttr = element.getAttribute('viewBox'),\n scaleX = 1,\n scaleY = 1,\n minX = 0,\n minY = 0,\n viewBoxWidth,\n viewBoxHeight,\n matrix,\n el,\n widthAttr = element.getAttribute('width'),\n heightAttr = element.getAttribute('height'),\n x = element.getAttribute('x') || 0,\n y = element.getAttribute('y') || 0,\n preserveAspectRatio = element.getAttribute('preserveAspectRatio') || '',\n missingViewBox = !viewBoxAttr || !(viewBoxAttr = viewBoxAttr.match(reViewBoxAttrValue)),\n missingDimAttr = !widthAttr || !heightAttr || widthAttr === '100%' || heightAttr === '100%',\n toBeParsed = missingViewBox && missingDimAttr,\n parsedDim = {},\n translateMatrix = '',\n widthDiff = 0,\n heightDiff = 0;\n parsedDim.width = 0;\n parsedDim.height = 0;\n parsedDim.toBeParsed = toBeParsed;\n\n if (missingViewBox) {\n if ((x || y) && element.parentNode.nodeName !== '#document') {\n translateMatrix = ' translate(' + parseUnit(x) + ' ' + parseUnit(y) + ') ';\n matrix = (element.getAttribute('transform') || '') + translateMatrix;\n element.setAttribute('transform', matrix);\n element.removeAttribute('x');\n element.removeAttribute('y');\n }\n }\n\n if (toBeParsed) {\n return parsedDim;\n }\n\n if (missingViewBox) {\n parsedDim.width = parseUnit(widthAttr);\n parsedDim.height = parseUnit(heightAttr); // set a transform for elements that have x y and are inner(only) SVGs\n\n return parsedDim;\n }\n\n minX = -parseFloat(viewBoxAttr[1]);\n minY = -parseFloat(viewBoxAttr[2]);\n viewBoxWidth = parseFloat(viewBoxAttr[3]);\n viewBoxHeight = parseFloat(viewBoxAttr[4]);\n parsedDim.minX = minX;\n parsedDim.minY = minY;\n parsedDim.viewBoxWidth = viewBoxWidth;\n parsedDim.viewBoxHeight = viewBoxHeight;\n\n if (!missingDimAttr) {\n parsedDim.width = parseUnit(widthAttr);\n parsedDim.height = parseUnit(heightAttr);\n scaleX = parsedDim.width / viewBoxWidth;\n scaleY = parsedDim.height / viewBoxHeight;\n } else {\n parsedDim.width = viewBoxWidth;\n parsedDim.height = viewBoxHeight;\n } // default is to preserve aspect ratio\n\n\n preserveAspectRatio = fabric.util.parsePreserveAspectRatioAttribute(preserveAspectRatio);\n\n if (preserveAspectRatio.alignX !== 'none') {\n //translate all container for the effect of Mid, Min, Max\n if (preserveAspectRatio.meetOrSlice === 'meet') {\n scaleY = scaleX = scaleX > scaleY ? scaleY : scaleX; // calculate additional translation to move the viewbox\n }\n\n if (preserveAspectRatio.meetOrSlice === 'slice') {\n scaleY = scaleX = scaleX > scaleY ? scaleX : scaleY; // calculate additional translation to move the viewbox\n }\n\n widthDiff = parsedDim.width - viewBoxWidth * scaleX;\n heightDiff = parsedDim.height - viewBoxHeight * scaleX;\n\n if (preserveAspectRatio.alignX === 'Mid') {\n widthDiff /= 2;\n }\n\n if (preserveAspectRatio.alignY === 'Mid') {\n heightDiff /= 2;\n }\n\n if (preserveAspectRatio.alignX === 'Min') {\n widthDiff = 0;\n }\n\n if (preserveAspectRatio.alignY === 'Min') {\n heightDiff = 0;\n }\n }\n\n if (scaleX === 1 && scaleY === 1 && minX === 0 && minY === 0 && x === 0 && y === 0) {\n return parsedDim;\n }\n\n if ((x || y) && element.parentNode.nodeName !== '#document') {\n translateMatrix = ' translate(' + parseUnit(x) + ' ' + parseUnit(y) + ') ';\n }\n\n matrix = translateMatrix + ' matrix(' + scaleX + ' 0' + ' 0 ' + scaleY + ' ' + (minX * scaleX + widthDiff) + ' ' + (minY * scaleY + heightDiff) + ') '; // seems unused.\n // parsedDim.viewboxTransform = fabric.parseTransformAttribute(matrix);\n\n if (element.nodeName === 'svg') {\n el = element.ownerDocument.createElementNS(fabric.svgNS, 'g'); // element.firstChild != null\n\n while (element.firstChild) {\n el.appendChild(element.firstChild);\n }\n\n element.appendChild(el);\n } else {\n el = element;\n el.removeAttribute('x');\n el.removeAttribute('y');\n matrix = el.getAttribute('transform') + matrix;\n }\n\n el.setAttribute('transform', matrix);\n return parsedDim;\n }\n\n function hasAncestorWithNodeName(element, nodeName) {\n while (element && (element = element.parentNode)) {\n if (element.nodeName && nodeName.test(element.nodeName.replace('svg:', '')) && !element.getAttribute('instantiated_by_use')) {\n return true;\n }\n }\n\n return false;\n }\n /**\n * Parses an SVG document, converts it to an array of corresponding fabric.* instances and passes them to a callback\n * @static\n * @function\n * @memberOf fabric\n * @param {SVGDocument} doc SVG document to parse\n * @param {Function} callback Callback to call when parsing is finished;\n * It's being passed an array of elements (parsed from a document).\n * @param {Function} [reviver] Method for further parsing of SVG elements, called after each fabric object created.\n * @param {Object} [parsingOptions] options for parsing document\n * @param {String} [parsingOptions.crossOrigin] crossOrigin settings\n */\n\n\n fabric.parseSVGDocument = function (doc, callback, reviver, parsingOptions) {\n if (!doc) {\n return;\n }\n\n parseUseDirectives(doc);\n var svgUid = fabric.Object.__uid++,\n i,\n len,\n options = applyViewboxTransform(doc),\n descendants = fabric.util.toArray(doc.getElementsByTagName('*'));\n options.crossOrigin = parsingOptions && parsingOptions.crossOrigin;\n options.svgUid = svgUid;\n\n if (descendants.length === 0 && fabric.isLikelyNode) {\n // we're likely in node, where \"o3-xml\" library fails to gEBTN(\"*\")\n // https://github.com/ajaxorg/node-o3-xml/issues/21\n descendants = doc.selectNodes('//*[name(.)!=\"svg\"]');\n var arr = [];\n\n for (i = 0, len = descendants.length; i < len; i++) {\n arr[i] = descendants[i];\n }\n\n descendants = arr;\n }\n\n var elements = descendants.filter(function (el) {\n applyViewboxTransform(el);\n return fabric.svgValidTagNamesRegEx.test(el.nodeName.replace('svg:', '')) && !hasAncestorWithNodeName(el, fabric.svgInvalidAncestorsRegEx); // http://www.w3.org/TR/SVG/struct.html#DefsElement\n });\n\n if (!elements || elements && !elements.length) {\n callback && callback([], {});\n return;\n }\n\n var clipPaths = {};\n descendants.filter(function (el) {\n return el.nodeName.replace('svg:', '') === 'clipPath';\n }).forEach(function (el) {\n var id = el.getAttribute('id');\n clipPaths[id] = fabric.util.toArray(el.getElementsByTagName('*')).filter(function (el) {\n return fabric.svgValidTagNamesRegEx.test(el.nodeName.replace('svg:', ''));\n });\n });\n fabric.gradientDefs[svgUid] = fabric.getGradientDefs(doc);\n fabric.cssRules[svgUid] = fabric.getCSSRules(doc);\n fabric.clipPaths[svgUid] = clipPaths; // Precedence of rules: style > class > attribute\n\n fabric.parseElements(elements, function (instances, elements) {\n if (callback) {\n callback(instances, options, elements, descendants);\n delete fabric.gradientDefs[svgUid];\n delete fabric.cssRules[svgUid];\n delete fabric.clipPaths[svgUid];\n }\n }, clone(options), reviver, parsingOptions);\n };\n\n function recursivelyParseGradientsXlink(doc, gradient) {\n var gradientsAttrs = ['gradientTransform', 'x1', 'x2', 'y1', 'y2', 'gradientUnits', 'cx', 'cy', 'r', 'fx', 'fy'],\n xlinkAttr = 'xlink:href',\n xLink = gradient.getAttribute(xlinkAttr).substr(1),\n referencedGradient = elementById(doc, xLink);\n\n if (referencedGradient && referencedGradient.getAttribute(xlinkAttr)) {\n recursivelyParseGradientsXlink(doc, referencedGradient);\n }\n\n gradientsAttrs.forEach(function (attr) {\n if (referencedGradient && !gradient.hasAttribute(attr) && referencedGradient.hasAttribute(attr)) {\n gradient.setAttribute(attr, referencedGradient.getAttribute(attr));\n }\n });\n\n if (!gradient.children.length) {\n var referenceClone = referencedGradient.cloneNode(true);\n\n while (referenceClone.firstChild) {\n gradient.appendChild(referenceClone.firstChild);\n }\n }\n\n gradient.removeAttribute(xlinkAttr);\n }\n\n var reFontDeclaration = new RegExp('(normal|italic)?\\\\s*(normal|small-caps)?\\\\s*' + '(normal|bold|bolder|lighter|100|200|300|400|500|600|700|800|900)?\\\\s*(' + fabric.reNum + '(?:px|cm|mm|em|pt|pc|in)*)(?:\\\\/(normal|' + fabric.reNum + '))?\\\\s+(.*)');\n extend(fabric, {\n /**\n * Parses a short font declaration, building adding its properties to a style object\n * @static\n * @function\n * @memberOf fabric\n * @param {String} value font declaration\n * @param {Object} oStyle definition\n */\n parseFontDeclaration: function (value, oStyle) {\n var match = value.match(reFontDeclaration);\n\n if (!match) {\n return;\n }\n\n var fontStyle = match[1],\n // font variant is not used\n // fontVariant = match[2],\n fontWeight = match[3],\n fontSize = match[4],\n lineHeight = match[5],\n fontFamily = match[6];\n\n if (fontStyle) {\n oStyle.fontStyle = fontStyle;\n }\n\n if (fontWeight) {\n oStyle.fontWeight = isNaN(parseFloat(fontWeight)) ? fontWeight : parseFloat(fontWeight);\n }\n\n if (fontSize) {\n oStyle.fontSize = parseUnit(fontSize);\n }\n\n if (fontFamily) {\n oStyle.fontFamily = fontFamily;\n }\n\n if (lineHeight) {\n oStyle.lineHeight = lineHeight === 'normal' ? 1 : lineHeight;\n }\n },\n\n /**\n * Parses an SVG document, returning all of the gradient declarations found in it\n * @static\n * @function\n * @memberOf fabric\n * @param {SVGDocument} doc SVG document to parse\n * @return {Object} Gradient definitions; key corresponds to element id, value -- to gradient definition element\n */\n getGradientDefs: function (doc) {\n var tagArray = ['linearGradient', 'radialGradient', 'svg:linearGradient', 'svg:radialGradient'],\n elList = _getMultipleNodes(doc, tagArray),\n el,\n j = 0,\n gradientDefs = {};\n\n j = elList.length;\n\n while (j--) {\n el = elList[j];\n\n if (el.getAttribute('xlink:href')) {\n recursivelyParseGradientsXlink(doc, el);\n }\n\n gradientDefs[el.getAttribute('id')] = el;\n }\n\n return gradientDefs;\n },\n\n /**\n * Returns an object of attributes' name/value, given element and an array of attribute names;\n * Parses parent \"g\" nodes recursively upwards.\n * @static\n * @memberOf fabric\n * @param {DOMElement} element Element to parse\n * @param {Array} attributes Array of attributes to parse\n * @return {Object} object containing parsed attributes' names/values\n */\n parseAttributes: function (element, attributes, svgUid) {\n if (!element) {\n return;\n }\n\n var value,\n parentAttributes = {},\n fontSize,\n parentFontSize;\n\n if (typeof svgUid === 'undefined') {\n svgUid = element.getAttribute('svgUid');\n } // if there's a parent container (`g` or `a` or `symbol` node), parse its attributes recursively upwards\n\n\n if (element.parentNode && fabric.svgValidParentsRegEx.test(element.parentNode.nodeName)) {\n parentAttributes = fabric.parseAttributes(element.parentNode, attributes, svgUid);\n }\n\n var ownAttributes = attributes.reduce(function (memo, attr) {\n value = element.getAttribute(attr);\n\n if (value) {\n // eslint-disable-line\n memo[attr] = value;\n }\n\n return memo;\n }, {}); // add values parsed from style, which take precedence over attributes\n // (see: http://www.w3.org/TR/SVG/styling.html#UsingPresentationAttributes)\n\n var cssAttrs = extend(getGlobalStylesForElement(element, svgUid), fabric.parseStyleAttribute(element));\n ownAttributes = extend(ownAttributes, cssAttrs);\n\n if (cssAttrs[cPath]) {\n element.setAttribute(cPath, cssAttrs[cPath]);\n }\n\n fontSize = parentFontSize = parentAttributes.fontSize || fabric.Text.DEFAULT_SVG_FONT_SIZE;\n\n if (ownAttributes[fSize]) {\n // looks like the minimum should be 9px when dealing with ems. this is what looks like in browsers.\n ownAttributes[fSize] = fontSize = parseUnit(ownAttributes[fSize], parentFontSize);\n }\n\n var normalizedAttr,\n normalizedValue,\n normalizedStyle = {};\n\n for (var attr in ownAttributes) {\n normalizedAttr = normalizeAttr(attr);\n normalizedValue = normalizeValue(normalizedAttr, ownAttributes[attr], parentAttributes, fontSize);\n normalizedStyle[normalizedAttr] = normalizedValue;\n }\n\n if (normalizedStyle && normalizedStyle.font) {\n fabric.parseFontDeclaration(normalizedStyle.font, normalizedStyle);\n }\n\n var mergedAttrs = extend(parentAttributes, normalizedStyle);\n return fabric.svgValidParentsRegEx.test(element.nodeName) ? mergedAttrs : _setStrokeFillOpacity(mergedAttrs);\n },\n\n /**\n * Transforms an array of svg elements to corresponding fabric.* instances\n * @static\n * @memberOf fabric\n * @param {Array} elements Array of elements to parse\n * @param {Function} callback Being passed an array of fabric instances (transformed from SVG elements)\n * @param {Object} [options] Options object\n * @param {Function} [reviver] Method for further parsing of SVG elements, called after each fabric object created.\n */\n parseElements: function (elements, callback, options, reviver, parsingOptions) {\n new fabric.ElementsParser(elements, callback, options, reviver, parsingOptions).parse();\n },\n\n /**\n * Parses \"style\" attribute, retuning an object with values\n * @static\n * @memberOf fabric\n * @param {SVGElement} element Element to parse\n * @return {Object} Objects with values parsed from style attribute of an element\n */\n parseStyleAttribute: function (element) {\n var oStyle = {},\n style = element.getAttribute('style');\n\n if (!style) {\n return oStyle;\n }\n\n if (typeof style === 'string') {\n parseStyleString(style, oStyle);\n } else {\n parseStyleObject(style, oStyle);\n }\n\n return oStyle;\n },\n\n /**\n * Parses \"points\" attribute, returning an array of values\n * @static\n * @memberOf fabric\n * @param {String} points points attribute string\n * @return {Array} array of points\n */\n parsePointsAttribute: function (points) {\n // points attribute is required and must not be empty\n if (!points) {\n return null;\n } // replace commas with whitespace and remove bookending whitespace\n\n\n points = points.replace(/,/g, ' ').trim();\n points = points.split(/\\s+/);\n var parsedPoints = [],\n i,\n len;\n\n for (i = 0, len = points.length; i < len; i += 2) {\n parsedPoints.push({\n x: parseFloat(points[i]),\n y: parseFloat(points[i + 1])\n });\n } // odd number of points is an error\n // if (parsedPoints.length % 2 !== 0) {\n // return null;\n // }\n\n\n return parsedPoints;\n },\n\n /**\n * Returns CSS rules for a given SVG document\n * @static\n * @function\n * @memberOf fabric\n * @param {SVGDocument} doc SVG document to parse\n * @return {Object} CSS rules of this document\n */\n getCSSRules: function (doc) {\n var styles = doc.getElementsByTagName('style'),\n i,\n len,\n allRules = {},\n rules; // very crude parsing of style contents\n\n for (i = 0, len = styles.length; i < len; i++) {\n // <style/> could produce `undefined`, covering this case with ''\n var styleContents = styles[i].textContent || ''; // remove comments\n\n styleContents = styleContents.replace(/\\/\\*[\\s\\S]*?\\*\\//g, '');\n\n if (styleContents.trim() === '') {\n continue;\n }\n\n rules = styleContents.match(/[^{]*\\{[\\s\\S]*?\\}/g);\n rules = rules.map(function (rule) {\n return rule.trim();\n }); // eslint-disable-next-line no-loop-func\n\n rules.forEach(function (rule) {\n var match = rule.match(/([\\s\\S]*?)\\s*\\{([^}]*)\\}/),\n ruleObj = {},\n declaration = match[2].trim(),\n propertyValuePairs = declaration.replace(/;$/, '').split(/\\s*;\\s*/);\n\n for (i = 0, len = propertyValuePairs.length; i < len; i++) {\n var pair = propertyValuePairs[i].split(/\\s*:\\s*/),\n property = pair[0],\n value = pair[1];\n ruleObj[property] = value;\n }\n\n rule = match[1];\n rule.split(',').forEach(function (_rule) {\n _rule = _rule.replace(/^svg/i, '').trim();\n\n if (_rule === '') {\n return;\n }\n\n if (allRules[_rule]) {\n fabric.util.object.extend(allRules[_rule], ruleObj);\n } else {\n allRules[_rule] = fabric.util.object.clone(ruleObj);\n }\n });\n });\n }\n\n return allRules;\n },\n\n /**\n * Takes url corresponding to an SVG document, and parses it into a set of fabric objects.\n * Note that SVG is fetched via XMLHttpRequest, so it needs to conform to SOP (Same Origin Policy)\n * @memberOf fabric\n * @param {String} url\n * @param {Function} callback\n * @param {Function} [reviver] Method for further parsing of SVG elements, called after each fabric object created.\n * @param {Object} [options] Object containing options for parsing\n * @param {String} [options.crossOrigin] crossOrigin crossOrigin setting to use for external resources\n */\n loadSVGFromURL: function (url, callback, reviver, options) {\n url = url.replace(/^\\n\\s*/, '').trim();\n new fabric.util.request(url, {\n method: 'get',\n onComplete: onComplete\n });\n\n function onComplete(r) {\n var xml = r.responseXML;\n\n if (!xml || !xml.documentElement) {\n callback && callback(null);\n return false;\n }\n\n fabric.parseSVGDocument(xml.documentElement, function (results, _options, elements, allElements) {\n callback && callback(results, _options, elements, allElements);\n }, reviver, options);\n }\n },\n\n /**\n * Takes string corresponding to an SVG document, and parses it into a set of fabric objects\n * @memberOf fabric\n * @param {String} string\n * @param {Function} callback\n * @param {Function} [reviver] Method for further parsing of SVG elements, called after each fabric object created.\n * @param {Object} [options] Object containing options for parsing\n * @param {String} [options.crossOrigin] crossOrigin crossOrigin setting to use for external resources\n */\n loadSVGFromString: function (string, callback, reviver, options) {\n var parser = new fabric.window.DOMParser(),\n doc = parser.parseFromString(string.trim(), 'text/xml');\n fabric.parseSVGDocument(doc.documentElement, function (results, _options, elements, allElements) {\n callback(results, _options, elements, allElements);\n }, reviver, options);\n }\n });\n})(typeof exports !== 'undefined' ? exports : this);\n\nfabric.ElementsParser = function (elements, callback, options, reviver, parsingOptions, doc) {\n this.elements = elements;\n this.callback = callback;\n this.options = options;\n this.reviver = reviver;\n this.svgUid = options && options.svgUid || 0;\n this.parsingOptions = parsingOptions;\n this.regexUrl = /^url\\(['\"]?#([^'\"]+)['\"]?\\)/g;\n this.doc = doc;\n};\n\n(function (proto) {\n proto.parse = function () {\n this.instances = new Array(this.elements.length);\n this.numElements = this.elements.length;\n this.createObjects();\n };\n\n proto.createObjects = function () {\n var _this = this;\n\n this.elements.forEach(function (element, i) {\n element.setAttribute('svgUid', _this.svgUid);\n\n _this.createObject(element, i);\n });\n };\n\n proto.findTag = function (el) {\n return fabric[fabric.util.string.capitalize(el.tagName.replace('svg:', ''))];\n };\n\n proto.createObject = function (el, index) {\n var klass = this.findTag(el);\n\n if (klass && klass.fromElement) {\n try {\n klass.fromElement(el, this.createCallback(index, el), this.options);\n } catch (err) {\n fabric.log(err);\n }\n } else {\n this.checkIfDone();\n }\n };\n\n proto.createCallback = function (index, el) {\n var _this = this;\n\n return function (obj) {\n var _options;\n\n _this.resolveGradient(obj, el, 'fill');\n\n _this.resolveGradient(obj, el, 'stroke');\n\n if (obj instanceof fabric.Image && obj._originalElement) {\n _options = obj.parsePreserveAspectRatioAttribute(el);\n }\n\n obj._removeTransformMatrix(_options);\n\n _this.resolveClipPath(obj, el);\n\n _this.reviver && _this.reviver(el, obj);\n _this.instances[index] = obj;\n\n _this.checkIfDone();\n };\n };\n\n proto.extractPropertyDefinition = function (obj, property, storage) {\n var value = obj[property],\n regex = this.regexUrl;\n\n if (!regex.test(value)) {\n return;\n }\n\n regex.lastIndex = 0;\n var id = regex.exec(value)[1];\n regex.lastIndex = 0;\n return fabric[storage][this.svgUid][id];\n };\n\n proto.resolveGradient = function (obj, el, property) {\n var gradientDef = this.extractPropertyDefinition(obj, property, 'gradientDefs');\n\n if (gradientDef) {\n var opacityAttr = el.getAttribute(property + '-opacity');\n var gradient = fabric.Gradient.fromElement(gradientDef, obj, opacityAttr, this.options);\n obj.set(property, gradient);\n }\n };\n\n proto.createClipPathCallback = function (obj, container) {\n return function (_newObj) {\n _newObj._removeTransformMatrix();\n\n _newObj.fillRule = _newObj.clipRule;\n container.push(_newObj);\n };\n };\n\n proto.resolveClipPath = function (obj, usingElement) {\n var clipPath = this.extractPropertyDefinition(obj, 'clipPath', 'clipPaths'),\n element,\n klass,\n objTransformInv,\n container,\n gTransform,\n options;\n\n if (clipPath) {\n container = [];\n objTransformInv = fabric.util.invertTransform(obj.calcTransformMatrix()); // move the clipPath tag as sibling to the real element that is using it\n\n var clipPathTag = clipPath[0].parentNode;\n var clipPathOwner = usingElement;\n\n while (clipPathOwner.parentNode && clipPathOwner.getAttribute('clip-path') !== obj.clipPath) {\n clipPathOwner = clipPathOwner.parentNode;\n }\n\n clipPathOwner.parentNode.appendChild(clipPathTag);\n\n for (var i = 0; i < clipPath.length; i++) {\n element = clipPath[i];\n klass = this.findTag(element);\n klass.fromElement(element, this.createClipPathCallback(obj, container), this.options);\n }\n\n if (container.length === 1) {\n clipPath = container[0];\n } else {\n clipPath = new fabric.Group(container);\n }\n\n gTransform = fabric.util.multiplyTransformMatrices(objTransformInv, clipPath.calcTransformMatrix());\n\n if (clipPath.clipPath) {\n this.resolveClipPath(clipPath, clipPathOwner);\n }\n\n var options = fabric.util.qrDecompose(gTransform);\n clipPath.flipX = false;\n clipPath.flipY = false;\n clipPath.set('scaleX', options.scaleX);\n clipPath.set('scaleY', options.scaleY);\n clipPath.angle = options.angle;\n clipPath.skewX = options.skewX;\n clipPath.skewY = 0;\n clipPath.setPositionByOrigin({\n x: options.translateX,\n y: options.translateY\n }, 'center', 'center');\n obj.clipPath = clipPath;\n } else {\n // if clip-path does not resolve to any element, delete the property.\n delete obj.clipPath;\n }\n };\n\n proto.checkIfDone = function () {\n if (--this.numElements === 0) {\n this.instances = this.instances.filter(function (el) {\n // eslint-disable-next-line no-eq-null, eqeqeq\n return el != null;\n });\n this.callback(this.instances, this.elements);\n }\n };\n})(fabric.ElementsParser.prototype);\n\n(function (global) {\n 'use strict';\n /* Adaptation of work of Kevin Lindsey (kevin@kevlindev.com) */\n\n var fabric = global.fabric || (global.fabric = {});\n\n if (fabric.Point) {\n fabric.warn('fabric.Point is already defined');\n return;\n }\n\n fabric.Point = Point;\n /**\n * Point class\n * @class fabric.Point\n * @memberOf fabric\n * @constructor\n * @param {Number} x\n * @param {Number} y\n * @return {fabric.Point} thisArg\n */\n\n function Point(x, y) {\n this.x = x;\n this.y = y;\n }\n\n Point.prototype =\n /** @lends fabric.Point.prototype */\n {\n type: 'point',\n constructor: Point,\n\n /**\n * Adds another point to this one and returns another one\n * @param {fabric.Point} that\n * @return {fabric.Point} new Point instance with added values\n */\n add: function (that) {\n return new Point(this.x + that.x, this.y + that.y);\n },\n\n /**\n * Adds another point to this one\n * @param {fabric.Point} that\n * @return {fabric.Point} thisArg\n * @chainable\n */\n addEquals: function (that) {\n this.x += that.x;\n this.y += that.y;\n return this;\n },\n\n /**\n * Adds value to this point and returns a new one\n * @param {Number} scalar\n * @return {fabric.Point} new Point with added value\n */\n scalarAdd: function (scalar) {\n return new Point(this.x + scalar, this.y + scalar);\n },\n\n /**\n * Adds value to this point\n * @param {Number} scalar\n * @return {fabric.Point} thisArg\n * @chainable\n */\n scalarAddEquals: function (scalar) {\n this.x += scalar;\n this.y += scalar;\n return this;\n },\n\n /**\n * Subtracts another point from this point and returns a new one\n * @param {fabric.Point} that\n * @return {fabric.Point} new Point object with subtracted values\n */\n subtract: function (that) {\n return new Point(this.x - that.x, this.y - that.y);\n },\n\n /**\n * Subtracts another point from this point\n * @param {fabric.Point} that\n * @return {fabric.Point} thisArg\n * @chainable\n */\n subtractEquals: function (that) {\n this.x -= that.x;\n this.y -= that.y;\n return this;\n },\n\n /**\n * Subtracts value from this point and returns a new one\n * @param {Number} scalar\n * @return {fabric.Point}\n */\n scalarSubtract: function (scalar) {\n return new Point(this.x - scalar, this.y - scalar);\n },\n\n /**\n * Subtracts value from this point\n * @param {Number} scalar\n * @return {fabric.Point} thisArg\n * @chainable\n */\n scalarSubtractEquals: function (scalar) {\n this.x -= scalar;\n this.y -= scalar;\n return this;\n },\n\n /**\n * Multiplies this point by a value and returns a new one\n * TODO: rename in scalarMultiply in 2.0\n * @param {Number} scalar\n * @return {fabric.Point}\n */\n multiply: function (scalar) {\n return new Point(this.x * scalar, this.y * scalar);\n },\n\n /**\n * Multiplies this point by a value\n * TODO: rename in scalarMultiplyEquals in 2.0\n * @param {Number} scalar\n * @return {fabric.Point} thisArg\n * @chainable\n */\n multiplyEquals: function (scalar) {\n this.x *= scalar;\n this.y *= scalar;\n return this;\n },\n\n /**\n * Divides this point by a value and returns a new one\n * TODO: rename in scalarDivide in 2.0\n * @param {Number} scalar\n * @return {fabric.Point}\n */\n divide: function (scalar) {\n return new Point(this.x / scalar, this.y / scalar);\n },\n\n /**\n * Divides this point by a value\n * TODO: rename in scalarDivideEquals in 2.0\n * @param {Number} scalar\n * @return {fabric.Point} thisArg\n * @chainable\n */\n divideEquals: function (scalar) {\n this.x /= scalar;\n this.y /= scalar;\n return this;\n },\n\n /**\n * Returns true if this point is equal to another one\n * @param {fabric.Point} that\n * @return {Boolean}\n */\n eq: function (that) {\n return this.x === that.x && this.y === that.y;\n },\n\n /**\n * Returns true if this point is less than another one\n * @param {fabric.Point} that\n * @return {Boolean}\n */\n lt: function (that) {\n return this.x < that.x && this.y < that.y;\n },\n\n /**\n * Returns true if this point is less than or equal to another one\n * @param {fabric.Point} that\n * @return {Boolean}\n */\n lte: function (that) {\n return this.x <= that.x && this.y <= that.y;\n },\n\n /**\n * Returns true if this point is greater another one\n * @param {fabric.Point} that\n * @return {Boolean}\n */\n gt: function (that) {\n return this.x > that.x && this.y > that.y;\n },\n\n /**\n * Returns true if this point is greater than or equal to another one\n * @param {fabric.Point} that\n * @return {Boolean}\n */\n gte: function (that) {\n return this.x >= that.x && this.y >= that.y;\n },\n\n /**\n * Returns new point which is the result of linear interpolation with this one and another one\n * @param {fabric.Point} that\n * @param {Number} t , position of interpolation, between 0 and 1 default 0.5\n * @return {fabric.Point}\n */\n lerp: function (that, t) {\n if (typeof t === 'undefined') {\n t = 0.5;\n }\n\n t = Math.max(Math.min(1, t), 0);\n return new Point(this.x + (that.x - this.x) * t, this.y + (that.y - this.y) * t);\n },\n\n /**\n * Returns distance from this point and another one\n * @param {fabric.Point} that\n * @return {Number}\n */\n distanceFrom: function (that) {\n var dx = this.x - that.x,\n dy = this.y - that.y;\n return Math.sqrt(dx * dx + dy * dy);\n },\n\n /**\n * Returns the point between this point and another one\n * @param {fabric.Point} that\n * @return {fabric.Point}\n */\n midPointFrom: function (that) {\n return this.lerp(that);\n },\n\n /**\n * Returns a new point which is the min of this and another one\n * @param {fabric.Point} that\n * @return {fabric.Point}\n */\n min: function (that) {\n return new Point(Math.min(this.x, that.x), Math.min(this.y, that.y));\n },\n\n /**\n * Returns a new point which is the max of this and another one\n * @param {fabric.Point} that\n * @return {fabric.Point}\n */\n max: function (that) {\n return new Point(Math.max(this.x, that.x), Math.max(this.y, that.y));\n },\n\n /**\n * Returns string representation of this point\n * @return {String}\n */\n toString: function () {\n return this.x + ',' + this.y;\n },\n\n /**\n * Sets x/y of this point\n * @param {Number} x\n * @param {Number} y\n * @chainable\n */\n setXY: function (x, y) {\n this.x = x;\n this.y = y;\n return this;\n },\n\n /**\n * Sets x of this point\n * @param {Number} x\n * @chainable\n */\n setX: function (x) {\n this.x = x;\n return this;\n },\n\n /**\n * Sets y of this point\n * @param {Number} y\n * @chainable\n */\n setY: function (y) {\n this.y = y;\n return this;\n },\n\n /**\n * Sets x/y of this point from another point\n * @param {fabric.Point} that\n * @chainable\n */\n setFromPoint: function (that) {\n this.x = that.x;\n this.y = that.y;\n return this;\n },\n\n /**\n * Swaps x/y of this point and another point\n * @param {fabric.Point} that\n */\n swap: function (that) {\n var x = this.x,\n y = this.y;\n this.x = that.x;\n this.y = that.y;\n that.x = x;\n that.y = y;\n },\n\n /**\n * return a cloned instance of the point\n * @return {fabric.Point}\n */\n clone: function () {\n return new Point(this.x, this.y);\n }\n };\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n /* Adaptation of work of Kevin Lindsey (kevin@kevlindev.com) */\n\n var fabric = global.fabric || (global.fabric = {});\n\n if (fabric.Intersection) {\n fabric.warn('fabric.Intersection is already defined');\n return;\n }\n /**\n * Intersection class\n * @class fabric.Intersection\n * @memberOf fabric\n * @constructor\n */\n\n\n function Intersection(status) {\n this.status = status;\n this.points = [];\n }\n\n fabric.Intersection = Intersection;\n fabric.Intersection.prototype =\n /** @lends fabric.Intersection.prototype */\n {\n constructor: Intersection,\n\n /**\n * Appends a point to intersection\n * @param {fabric.Point} point\n * @return {fabric.Intersection} thisArg\n * @chainable\n */\n appendPoint: function (point) {\n this.points.push(point);\n return this;\n },\n\n /**\n * Appends points to intersection\n * @param {Array} points\n * @return {fabric.Intersection} thisArg\n * @chainable\n */\n appendPoints: function (points) {\n this.points = this.points.concat(points);\n return this;\n }\n };\n /**\n * Checks if one line intersects another\n * TODO: rename in intersectSegmentSegment\n * @static\n * @param {fabric.Point} a1\n * @param {fabric.Point} a2\n * @param {fabric.Point} b1\n * @param {fabric.Point} b2\n * @return {fabric.Intersection}\n */\n\n fabric.Intersection.intersectLineLine = function (a1, a2, b1, b2) {\n var result,\n uaT = (b2.x - b1.x) * (a1.y - b1.y) - (b2.y - b1.y) * (a1.x - b1.x),\n ubT = (a2.x - a1.x) * (a1.y - b1.y) - (a2.y - a1.y) * (a1.x - b1.x),\n uB = (b2.y - b1.y) * (a2.x - a1.x) - (b2.x - b1.x) * (a2.y - a1.y);\n\n if (uB !== 0) {\n var ua = uaT / uB,\n ub = ubT / uB;\n\n if (0 <= ua && ua <= 1 && 0 <= ub && ub <= 1) {\n result = new Intersection('Intersection');\n result.appendPoint(new fabric.Point(a1.x + ua * (a2.x - a1.x), a1.y + ua * (a2.y - a1.y)));\n } else {\n result = new Intersection();\n }\n } else {\n if (uaT === 0 || ubT === 0) {\n result = new Intersection('Coincident');\n } else {\n result = new Intersection('Parallel');\n }\n }\n\n return result;\n };\n /**\n * Checks if line intersects polygon\n * TODO: rename in intersectSegmentPolygon\n * fix detection of coincident\n * @static\n * @param {fabric.Point} a1\n * @param {fabric.Point} a2\n * @param {Array} points\n * @return {fabric.Intersection}\n */\n\n\n fabric.Intersection.intersectLinePolygon = function (a1, a2, points) {\n var result = new Intersection(),\n length = points.length,\n b1,\n b2,\n inter,\n i;\n\n for (i = 0; i < length; i++) {\n b1 = points[i];\n b2 = points[(i + 1) % length];\n inter = Intersection.intersectLineLine(a1, a2, b1, b2);\n result.appendPoints(inter.points);\n }\n\n if (result.points.length > 0) {\n result.status = 'Intersection';\n }\n\n return result;\n };\n /**\n * Checks if polygon intersects another polygon\n * @static\n * @param {Array} points1\n * @param {Array} points2\n * @return {fabric.Intersection}\n */\n\n\n fabric.Intersection.intersectPolygonPolygon = function (points1, points2) {\n var result = new Intersection(),\n length = points1.length,\n i;\n\n for (i = 0; i < length; i++) {\n var a1 = points1[i],\n a2 = points1[(i + 1) % length],\n inter = Intersection.intersectLinePolygon(a1, a2, points2);\n result.appendPoints(inter.points);\n }\n\n if (result.points.length > 0) {\n result.status = 'Intersection';\n }\n\n return result;\n };\n /**\n * Checks if polygon intersects rectangle\n * @static\n * @param {Array} points\n * @param {fabric.Point} r1\n * @param {fabric.Point} r2\n * @return {fabric.Intersection}\n */\n\n\n fabric.Intersection.intersectPolygonRectangle = function (points, r1, r2) {\n var min = r1.min(r2),\n max = r1.max(r2),\n topRight = new fabric.Point(max.x, min.y),\n bottomLeft = new fabric.Point(min.x, max.y),\n inter1 = Intersection.intersectLinePolygon(min, topRight, points),\n inter2 = Intersection.intersectLinePolygon(topRight, max, points),\n inter3 = Intersection.intersectLinePolygon(max, bottomLeft, points),\n inter4 = Intersection.intersectLinePolygon(bottomLeft, min, points),\n result = new Intersection();\n result.appendPoints(inter1.points);\n result.appendPoints(inter2.points);\n result.appendPoints(inter3.points);\n result.appendPoints(inter4.points);\n\n if (result.points.length > 0) {\n result.status = 'Intersection';\n }\n\n return result;\n };\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {});\n\n if (fabric.Color) {\n fabric.warn('fabric.Color is already defined.');\n return;\n }\n /**\n * Color class\n * The purpose of {@link fabric.Color} is to abstract and encapsulate common color operations;\n * {@link fabric.Color} is a constructor and creates instances of {@link fabric.Color} objects.\n *\n * @class fabric.Color\n * @param {String} color optional in hex or rgb(a) or hsl format or from known color list\n * @return {fabric.Color} thisArg\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-2/#colors}\n */\n\n\n function Color(color) {\n if (!color) {\n this.setSource([0, 0, 0, 1]);\n } else {\n this._tryParsingColor(color);\n }\n }\n\n fabric.Color = Color;\n fabric.Color.prototype =\n /** @lends fabric.Color.prototype */\n {\n /**\n * @private\n * @param {String|Array} color Color value to parse\n */\n _tryParsingColor: function (color) {\n var source;\n\n if (color in Color.colorNameMap) {\n color = Color.colorNameMap[color];\n }\n\n if (color === 'transparent') {\n source = [255, 255, 255, 0];\n }\n\n if (!source) {\n source = Color.sourceFromHex(color);\n }\n\n if (!source) {\n source = Color.sourceFromRgb(color);\n }\n\n if (!source) {\n source = Color.sourceFromHsl(color);\n }\n\n if (!source) {\n //if color is not recognize let's make black as canvas does\n source = [0, 0, 0, 1];\n }\n\n if (source) {\n this.setSource(source);\n }\n },\n\n /**\n * Adapted from <a href=\"https://rawgithub.com/mjijackson/mjijackson.github.com/master/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript.html\">https://github.com/mjijackson</a>\n * @private\n * @param {Number} r Red color value\n * @param {Number} g Green color value\n * @param {Number} b Blue color value\n * @return {Array} Hsl color\n */\n _rgbToHsl: function (r, g, b) {\n r /= 255;\n g /= 255;\n b /= 255;\n var h,\n s,\n l,\n max = fabric.util.array.max([r, g, b]),\n min = fabric.util.array.min([r, g, b]);\n l = (max + min) / 2;\n\n if (max === min) {\n h = s = 0; // achromatic\n } else {\n var d = max - min;\n s = l > 0.5 ? d / (2 - max - min) : d / (max + min);\n\n switch (max) {\n case r:\n h = (g - b) / d + (g < b ? 6 : 0);\n break;\n\n case g:\n h = (b - r) / d + 2;\n break;\n\n case b:\n h = (r - g) / d + 4;\n break;\n }\n\n h /= 6;\n }\n\n return [Math.round(h * 360), Math.round(s * 100), Math.round(l * 100)];\n },\n\n /**\n * Returns source of this color (where source is an array representation; ex: [200, 200, 100, 1])\n * @return {Array}\n */\n getSource: function () {\n return this._source;\n },\n\n /**\n * Sets source of this color (where source is an array representation; ex: [200, 200, 100, 1])\n * @param {Array} source\n */\n setSource: function (source) {\n this._source = source;\n },\n\n /**\n * Returns color representation in RGB format\n * @return {String} ex: rgb(0-255,0-255,0-255)\n */\n toRgb: function () {\n var source = this.getSource();\n return 'rgb(' + source[0] + ',' + source[1] + ',' + source[2] + ')';\n },\n\n /**\n * Returns color representation in RGBA format\n * @return {String} ex: rgba(0-255,0-255,0-255,0-1)\n */\n toRgba: function () {\n var source = this.getSource();\n return 'rgba(' + source[0] + ',' + source[1] + ',' + source[2] + ',' + source[3] + ')';\n },\n\n /**\n * Returns color representation in HSL format\n * @return {String} ex: hsl(0-360,0%-100%,0%-100%)\n */\n toHsl: function () {\n var source = this.getSource(),\n hsl = this._rgbToHsl(source[0], source[1], source[2]);\n\n return 'hsl(' + hsl[0] + ',' + hsl[1] + '%,' + hsl[2] + '%)';\n },\n\n /**\n * Returns color representation in HSLA format\n * @return {String} ex: hsla(0-360,0%-100%,0%-100%,0-1)\n */\n toHsla: function () {\n var source = this.getSource(),\n hsl = this._rgbToHsl(source[0], source[1], source[2]);\n\n return 'hsla(' + hsl[0] + ',' + hsl[1] + '%,' + hsl[2] + '%,' + source[3] + ')';\n },\n\n /**\n * Returns color representation in HEX format\n * @return {String} ex: FF5555\n */\n toHex: function () {\n var source = this.getSource(),\n r,\n g,\n b;\n r = source[0].toString(16);\n r = r.length === 1 ? '0' + r : r;\n g = source[1].toString(16);\n g = g.length === 1 ? '0' + g : g;\n b = source[2].toString(16);\n b = b.length === 1 ? '0' + b : b;\n return r.toUpperCase() + g.toUpperCase() + b.toUpperCase();\n },\n\n /**\n * Returns color representation in HEXA format\n * @return {String} ex: FF5555CC\n */\n toHexa: function () {\n var source = this.getSource(),\n a;\n a = Math.round(source[3] * 255);\n a = a.toString(16);\n a = a.length === 1 ? '0' + a : a;\n return this.toHex() + a.toUpperCase();\n },\n\n /**\n * Gets value of alpha channel for this color\n * @return {Number} 0-1\n */\n getAlpha: function () {\n return this.getSource()[3];\n },\n\n /**\n * Sets value of alpha channel for this color\n * @param {Number} alpha Alpha value 0-1\n * @return {fabric.Color} thisArg\n */\n setAlpha: function (alpha) {\n var source = this.getSource();\n source[3] = alpha;\n this.setSource(source);\n return this;\n },\n\n /**\n * Transforms color to its grayscale representation\n * @return {fabric.Color} thisArg\n */\n toGrayscale: function () {\n var source = this.getSource(),\n average = parseInt((source[0] * 0.3 + source[1] * 0.59 + source[2] * 0.11).toFixed(0), 10),\n currentAlpha = source[3];\n this.setSource([average, average, average, currentAlpha]);\n return this;\n },\n\n /**\n * Transforms color to its black and white representation\n * @param {Number} threshold\n * @return {fabric.Color} thisArg\n */\n toBlackWhite: function (threshold) {\n var source = this.getSource(),\n average = (source[0] * 0.3 + source[1] * 0.59 + source[2] * 0.11).toFixed(0),\n currentAlpha = source[3];\n threshold = threshold || 127;\n average = Number(average) < Number(threshold) ? 0 : 255;\n this.setSource([average, average, average, currentAlpha]);\n return this;\n },\n\n /**\n * Overlays color with another color\n * @param {String|fabric.Color} otherColor\n * @return {fabric.Color} thisArg\n */\n overlayWith: function (otherColor) {\n if (!(otherColor instanceof Color)) {\n otherColor = new Color(otherColor);\n }\n\n var result = [],\n alpha = this.getAlpha(),\n otherAlpha = 0.5,\n source = this.getSource(),\n otherSource = otherColor.getSource(),\n i;\n\n for (i = 0; i < 3; i++) {\n result.push(Math.round(source[i] * (1 - otherAlpha) + otherSource[i] * otherAlpha));\n }\n\n result[3] = alpha;\n this.setSource(result);\n return this;\n }\n };\n /**\n * Regex matching color in RGB or RGBA formats (ex: rgb(0, 0, 0), rgba(255, 100, 10, 0.5), rgba( 255 , 100 , 10 , 0.5 ), rgb(1,1,1), rgba(100%, 60%, 10%, 0.5))\n * @static\n * @field\n * @memberOf fabric.Color\n */\n // eslint-disable-next-line max-len\n\n fabric.Color.reRGBa = /^rgba?\\(\\s*(\\d{1,3}(?:\\.\\d+)?\\%?)\\s*,\\s*(\\d{1,3}(?:\\.\\d+)?\\%?)\\s*,\\s*(\\d{1,3}(?:\\.\\d+)?\\%?)\\s*(?:\\s*,\\s*((?:\\d*\\.?\\d+)?)\\s*)?\\)$/i;\n /**\n * Regex matching color in HSL or HSLA formats (ex: hsl(200, 80%, 10%), hsla(300, 50%, 80%, 0.5), hsla( 300 , 50% , 80% , 0.5 ))\n * @static\n * @field\n * @memberOf fabric.Color\n */\n\n fabric.Color.reHSLa = /^hsla?\\(\\s*(\\d{1,3})\\s*,\\s*(\\d{1,3}\\%)\\s*,\\s*(\\d{1,3}\\%)\\s*(?:\\s*,\\s*(\\d+(?:\\.\\d+)?)\\s*)?\\)$/i;\n /**\n * Regex matching color in HEX format (ex: #FF5544CC, #FF5555, 010155, aff)\n * @static\n * @field\n * @memberOf fabric.Color\n */\n\n fabric.Color.reHex = /^#?([0-9a-f]{8}|[0-9a-f]{6}|[0-9a-f]{4}|[0-9a-f]{3})$/i;\n /**\n * Map of the 148 color names with HEX code\n * @static\n * @field\n * @memberOf fabric.Color\n * @see: https://www.w3.org/TR/css3-color/#svg-color\n */\n\n fabric.Color.colorNameMap = {\n aliceblue: '#F0F8FF',\n antiquewhite: '#FAEBD7',\n aqua: '#00FFFF',\n aquamarine: '#7FFFD4',\n azure: '#F0FFFF',\n beige: '#F5F5DC',\n bisque: '#FFE4C4',\n black: '#000000',\n blanchedalmond: '#FFEBCD',\n blue: '#0000FF',\n blueviolet: '#8A2BE2',\n brown: '#A52A2A',\n burlywood: '#DEB887',\n cadetblue: '#5F9EA0',\n chartreuse: '#7FFF00',\n chocolate: '#D2691E',\n coral: '#FF7F50',\n cornflowerblue: '#6495ED',\n cornsilk: '#FFF8DC',\n crimson: '#DC143C',\n cyan: '#00FFFF',\n darkblue: '#00008B',\n darkcyan: '#008B8B',\n darkgoldenrod: '#B8860B',\n darkgray: '#A9A9A9',\n darkgrey: '#A9A9A9',\n darkgreen: '#006400',\n darkkhaki: '#BDB76B',\n darkmagenta: '#8B008B',\n darkolivegreen: '#556B2F',\n darkorange: '#FF8C00',\n darkorchid: '#9932CC',\n darkred: '#8B0000',\n darksalmon: '#E9967A',\n darkseagreen: '#8FBC8F',\n darkslateblue: '#483D8B',\n darkslategray: '#2F4F4F',\n darkslategrey: '#2F4F4F',\n darkturquoise: '#00CED1',\n darkviolet: '#9400D3',\n deeppink: '#FF1493',\n deepskyblue: '#00BFFF',\n dimgray: '#696969',\n dimgrey: '#696969',\n dodgerblue: '#1E90FF',\n firebrick: '#B22222',\n floralwhite: '#FFFAF0',\n forestgreen: '#228B22',\n fuchsia: '#FF00FF',\n gainsboro: '#DCDCDC',\n ghostwhite: '#F8F8FF',\n gold: '#FFD700',\n goldenrod: '#DAA520',\n gray: '#808080',\n grey: '#808080',\n green: '#008000',\n greenyellow: '#ADFF2F',\n honeydew: '#F0FFF0',\n hotpink: '#FF69B4',\n indianred: '#CD5C5C',\n indigo: '#4B0082',\n ivory: '#FFFFF0',\n khaki: '#F0E68C',\n lavender: '#E6E6FA',\n lavenderblush: '#FFF0F5',\n lawngreen: '#7CFC00',\n lemonchiffon: '#FFFACD',\n lightblue: '#ADD8E6',\n lightcoral: '#F08080',\n lightcyan: '#E0FFFF',\n lightgoldenrodyellow: '#FAFAD2',\n lightgray: '#D3D3D3',\n lightgrey: '#D3D3D3',\n lightgreen: '#90EE90',\n lightpink: '#FFB6C1',\n lightsalmon: '#FFA07A',\n lightseagreen: '#20B2AA',\n lightskyblue: '#87CEFA',\n lightslategray: '#778899',\n lightslategrey: '#778899',\n lightsteelblue: '#B0C4DE',\n lightyellow: '#FFFFE0',\n lime: '#00FF00',\n limegreen: '#32CD32',\n linen: '#FAF0E6',\n magenta: '#FF00FF',\n maroon: '#800000',\n mediumaquamarine: '#66CDAA',\n mediumblue: '#0000CD',\n mediumorchid: '#BA55D3',\n mediumpurple: '#9370DB',\n mediumseagreen: '#3CB371',\n mediumslateblue: '#7B68EE',\n mediumspringgreen: '#00FA9A',\n mediumturquoise: '#48D1CC',\n mediumvioletred: '#C71585',\n midnightblue: '#191970',\n mintcream: '#F5FFFA',\n mistyrose: '#FFE4E1',\n moccasin: '#FFE4B5',\n navajowhite: '#FFDEAD',\n navy: '#000080',\n oldlace: '#FDF5E6',\n olive: '#808000',\n olivedrab: '#6B8E23',\n orange: '#FFA500',\n orangered: '#FF4500',\n orchid: '#DA70D6',\n palegoldenrod: '#EEE8AA',\n palegreen: '#98FB98',\n paleturquoise: '#AFEEEE',\n palevioletred: '#DB7093',\n papayawhip: '#FFEFD5',\n peachpuff: '#FFDAB9',\n peru: '#CD853F',\n pink: '#FFC0CB',\n plum: '#DDA0DD',\n powderblue: '#B0E0E6',\n purple: '#800080',\n rebeccapurple: '#663399',\n red: '#FF0000',\n rosybrown: '#BC8F8F',\n royalblue: '#4169E1',\n saddlebrown: '#8B4513',\n salmon: '#FA8072',\n sandybrown: '#F4A460',\n seagreen: '#2E8B57',\n seashell: '#FFF5EE',\n sienna: '#A0522D',\n silver: '#C0C0C0',\n skyblue: '#87CEEB',\n slateblue: '#6A5ACD',\n slategray: '#708090',\n slategrey: '#708090',\n snow: '#FFFAFA',\n springgreen: '#00FF7F',\n steelblue: '#4682B4',\n tan: '#D2B48C',\n teal: '#008080',\n thistle: '#D8BFD8',\n tomato: '#FF6347',\n turquoise: '#40E0D0',\n violet: '#EE82EE',\n wheat: '#F5DEB3',\n white: '#FFFFFF',\n whitesmoke: '#F5F5F5',\n yellow: '#FFFF00',\n yellowgreen: '#9ACD32'\n };\n /**\n * @private\n * @param {Number} p\n * @param {Number} q\n * @param {Number} t\n * @return {Number}\n */\n\n function hue2rgb(p, q, t) {\n if (t < 0) {\n t += 1;\n }\n\n if (t > 1) {\n t -= 1;\n }\n\n if (t < 1 / 6) {\n return p + (q - p) * 6 * t;\n }\n\n if (t < 1 / 2) {\n return q;\n }\n\n if (t < 2 / 3) {\n return p + (q - p) * (2 / 3 - t) * 6;\n }\n\n return p;\n }\n /**\n * Returns new color object, when given a color in RGB format\n * @memberOf fabric.Color\n * @param {String} color Color value ex: rgb(0-255,0-255,0-255)\n * @return {fabric.Color}\n */\n\n\n fabric.Color.fromRgb = function (color) {\n return Color.fromSource(Color.sourceFromRgb(color));\n };\n /**\n * Returns array representation (ex: [100, 100, 200, 1]) of a color that's in RGB or RGBA format\n * @memberOf fabric.Color\n * @param {String} color Color value ex: rgb(0-255,0-255,0-255), rgb(0%-100%,0%-100%,0%-100%)\n * @return {Array} source\n */\n\n\n fabric.Color.sourceFromRgb = function (color) {\n var match = color.match(Color.reRGBa);\n\n if (match) {\n var r = parseInt(match[1], 10) / (/%$/.test(match[1]) ? 100 : 1) * (/%$/.test(match[1]) ? 255 : 1),\n g = parseInt(match[2], 10) / (/%$/.test(match[2]) ? 100 : 1) * (/%$/.test(match[2]) ? 255 : 1),\n b = parseInt(match[3], 10) / (/%$/.test(match[3]) ? 100 : 1) * (/%$/.test(match[3]) ? 255 : 1);\n return [parseInt(r, 10), parseInt(g, 10), parseInt(b, 10), match[4] ? parseFloat(match[4]) : 1];\n }\n };\n /**\n * Returns new color object, when given a color in RGBA format\n * @static\n * @function\n * @memberOf fabric.Color\n * @param {String} color\n * @return {fabric.Color}\n */\n\n\n fabric.Color.fromRgba = Color.fromRgb;\n /**\n * Returns new color object, when given a color in HSL format\n * @param {String} color Color value ex: hsl(0-260,0%-100%,0%-100%)\n * @memberOf fabric.Color\n * @return {fabric.Color}\n */\n\n fabric.Color.fromHsl = function (color) {\n return Color.fromSource(Color.sourceFromHsl(color));\n };\n /**\n * Returns array representation (ex: [100, 100, 200, 1]) of a color that's in HSL or HSLA format.\n * Adapted from <a href=\"https://rawgithub.com/mjijackson/mjijackson.github.com/master/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript.html\">https://github.com/mjijackson</a>\n * @memberOf fabric.Color\n * @param {String} color Color value ex: hsl(0-360,0%-100%,0%-100%) or hsla(0-360,0%-100%,0%-100%, 0-1)\n * @return {Array} source\n * @see http://http://www.w3.org/TR/css3-color/#hsl-color\n */\n\n\n fabric.Color.sourceFromHsl = function (color) {\n var match = color.match(Color.reHSLa);\n\n if (!match) {\n return;\n }\n\n var h = (parseFloat(match[1]) % 360 + 360) % 360 / 360,\n s = parseFloat(match[2]) / (/%$/.test(match[2]) ? 100 : 1),\n l = parseFloat(match[3]) / (/%$/.test(match[3]) ? 100 : 1),\n r,\n g,\n b;\n\n if (s === 0) {\n r = g = b = l;\n } else {\n var q = l <= 0.5 ? l * (s + 1) : l + s - l * s,\n p = l * 2 - q;\n r = hue2rgb(p, q, h + 1 / 3);\n g = hue2rgb(p, q, h);\n b = hue2rgb(p, q, h - 1 / 3);\n }\n\n return [Math.round(r * 255), Math.round(g * 255), Math.round(b * 255), match[4] ? parseFloat(match[4]) : 1];\n };\n /**\n * Returns new color object, when given a color in HSLA format\n * @static\n * @function\n * @memberOf fabric.Color\n * @param {String} color\n * @return {fabric.Color}\n */\n\n\n fabric.Color.fromHsla = Color.fromHsl;\n /**\n * Returns new color object, when given a color in HEX format\n * @static\n * @memberOf fabric.Color\n * @param {String} color Color value ex: FF5555\n * @return {fabric.Color}\n */\n\n fabric.Color.fromHex = function (color) {\n return Color.fromSource(Color.sourceFromHex(color));\n };\n /**\n * Returns array representation (ex: [100, 100, 200, 1]) of a color that's in HEX format\n * @static\n * @memberOf fabric.Color\n * @param {String} color ex: FF5555 or FF5544CC (RGBa)\n * @return {Array} source\n */\n\n\n fabric.Color.sourceFromHex = function (color) {\n if (color.match(Color.reHex)) {\n var value = color.slice(color.indexOf('#') + 1),\n isShortNotation = value.length === 3 || value.length === 4,\n isRGBa = value.length === 8 || value.length === 4,\n r = isShortNotation ? value.charAt(0) + value.charAt(0) : value.substring(0, 2),\n g = isShortNotation ? value.charAt(1) + value.charAt(1) : value.substring(2, 4),\n b = isShortNotation ? value.charAt(2) + value.charAt(2) : value.substring(4, 6),\n a = isRGBa ? isShortNotation ? value.charAt(3) + value.charAt(3) : value.substring(6, 8) : 'FF';\n return [parseInt(r, 16), parseInt(g, 16), parseInt(b, 16), parseFloat((parseInt(a, 16) / 255).toFixed(2))];\n }\n };\n /**\n * Returns new color object, when given color in array representation (ex: [200, 100, 100, 0.5])\n * @static\n * @memberOf fabric.Color\n * @param {Array} source\n * @return {fabric.Color}\n */\n\n\n fabric.Color.fromSource = function (source) {\n var oColor = new Color();\n oColor.setSource(source);\n return oColor;\n };\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n scaleMap = ['e', 'se', 's', 'sw', 'w', 'nw', 'n', 'ne', 'e'],\n skewMap = ['ns', 'nesw', 'ew', 'nwse'],\n controls = {},\n LEFT = 'left',\n TOP = 'top',\n RIGHT = 'right',\n BOTTOM = 'bottom',\n CENTER = 'center',\n opposite = {\n top: BOTTOM,\n bottom: TOP,\n left: RIGHT,\n right: LEFT,\n center: CENTER\n },\n radiansToDegrees = fabric.util.radiansToDegrees,\n sign = Math.sign || function (x) {\n return (x > 0) - (x < 0) || +x;\n };\n /**\n * Combine control position and object angle to find the control direction compared\n * to the object center.\n * @param {fabric.Object} fabricObject the fabric object for which we are rendering controls\n * @param {fabric.Control} control the control class\n * @return {Number} 0 - 7 a quadrant number\n */\n\n\n function findCornerQuadrant(fabricObject, control) {\n var cornerAngle = fabricObject.angle + radiansToDegrees(Math.atan2(control.y, control.x)) + 360;\n return Math.round(cornerAngle % 360 / 45);\n }\n\n function fireEvent(eventName, options) {\n var target = options.transform.target,\n canvas = target.canvas,\n canvasOptions = fabric.util.object.clone(options);\n canvasOptions.target = target;\n canvas && canvas.fire('object:' + eventName, canvasOptions);\n target.fire(eventName, options);\n }\n /**\n * Inspect event and fabricObject properties to understand if the scaling action\n * @param {Event} eventData from the user action\n * @param {fabric.Object} fabricObject the fabric object about to scale\n * @return {Boolean} true if scale is proportional\n */\n\n\n function scaleIsProportional(eventData, fabricObject) {\n var canvas = fabricObject.canvas,\n uniScaleKey = canvas.uniScaleKey,\n uniformIsToggled = eventData[uniScaleKey];\n return canvas.uniformScaling && !uniformIsToggled || !canvas.uniformScaling && uniformIsToggled;\n }\n /**\n * Checks if transform is centered\n * @param {Object} transform transform data\n * @return {Boolean} true if transform is centered\n */\n\n\n function isTransformCentered(transform) {\n return transform.originX === CENTER && transform.originY === CENTER;\n }\n /**\n * Inspect fabricObject to understand if the current scaling action is allowed\n * @param {fabric.Object} fabricObject the fabric object about to scale\n * @param {String} by 'x' or 'y' or ''\n * @param {Boolean} scaleProportionally true if we are trying to scale proportionally\n * @return {Boolean} true if scaling is not allowed at current conditions\n */\n\n\n function scalingIsForbidden(fabricObject, by, scaleProportionally) {\n var lockX = fabricObject.lockScalingX,\n lockY = fabricObject.lockScalingY;\n\n if (lockX && lockY) {\n return true;\n }\n\n if (!by && (lockX || lockY) && scaleProportionally) {\n return true;\n }\n\n if (lockX && by === 'x') {\n return true;\n }\n\n if (lockY && by === 'y') {\n return true;\n }\n\n return false;\n }\n /**\n * return the correct cursor style for the scale action\n * @param {Event} eventData the javascript event that is causing the scale\n * @param {fabric.Control} control the control that is interested in the action\n * @param {fabric.Object} fabricObject the fabric object that is interested in the action\n * @return {String} a valid css string for the cursor\n */\n\n\n function scaleCursorStyleHandler(eventData, control, fabricObject) {\n var notAllowed = 'not-allowed',\n scaleProportionally = scaleIsProportional(eventData, fabricObject),\n by = '';\n\n if (control.x !== 0 && control.y === 0) {\n by = 'x';\n } else if (control.x === 0 && control.y !== 0) {\n by = 'y';\n }\n\n if (scalingIsForbidden(fabricObject, by, scaleProportionally)) {\n return notAllowed;\n }\n\n var n = findCornerQuadrant(fabricObject, control);\n return scaleMap[n] + '-resize';\n }\n /**\n * return the correct cursor style for the skew action\n * @param {Event} eventData the javascript event that is causing the scale\n * @param {fabric.Control} control the control that is interested in the action\n * @param {fabric.Object} fabricObject the fabric object that is interested in the action\n * @return {String} a valid css string for the cursor\n */\n\n\n function skewCursorStyleHandler(eventData, control, fabricObject) {\n var notAllowed = 'not-allowed';\n\n if (control.x !== 0 && fabricObject.lockSkewingY) {\n return notAllowed;\n }\n\n if (control.y !== 0 && fabricObject.lockSkewingX) {\n return notAllowed;\n }\n\n var n = findCornerQuadrant(fabricObject, control) % 4;\n return skewMap[n] + '-resize';\n }\n /**\n * Combine skew and scale style handlers to cover fabric standard use case\n * @param {Event} eventData the javascript event that is causing the scale\n * @param {fabric.Control} control the control that is interested in the action\n * @param {fabric.Object} fabricObject the fabric object that is interested in the action\n * @return {String} a valid css string for the cursor\n */\n\n\n function scaleSkewCursorStyleHandler(eventData, control, fabricObject) {\n if (eventData[fabricObject.canvas.altActionKey]) {\n return controls.skewCursorStyleHandler(eventData, control, fabricObject);\n }\n\n return controls.scaleCursorStyleHandler(eventData, control, fabricObject);\n }\n /**\n * Inspect event, control and fabricObject to return the correct action name\n * @param {Event} eventData the javascript event that is causing the scale\n * @param {fabric.Control} control the control that is interested in the action\n * @param {fabric.Object} fabricObject the fabric object that is interested in the action\n * @return {String} an action name\n */\n\n\n function scaleOrSkewActionName(eventData, control, fabricObject) {\n var isAlternative = eventData[fabricObject.canvas.altActionKey];\n\n if (control.x === 0) {\n // then is scaleY or skewX\n return isAlternative ? 'skewX' : 'scaleY';\n }\n\n if (control.y === 0) {\n // then is scaleY or skewX\n return isAlternative ? 'skewY' : 'scaleX';\n }\n }\n /**\n * Find the correct style for the control that is used for rotation.\n * this function is very simple and it just take care of not-allowed or standard cursor\n * @param {Event} eventData the javascript event that is causing the scale\n * @param {fabric.Control} control the control that is interested in the action\n * @param {fabric.Object} fabricObject the fabric object that is interested in the action\n * @return {String} a valid css string for the cursor\n */\n\n\n function rotationStyleHandler(eventData, control, fabricObject) {\n if (fabricObject.lockRotation) {\n return 'not-allowed';\n }\n\n return control.cursorStyle;\n }\n\n function commonEventInfo(eventData, transform, x, y) {\n return {\n e: eventData,\n transform: transform,\n pointer: {\n x: x,\n y: y\n }\n };\n }\n /**\n * Wrap an action handler with saving/restoring object position on the transform.\n * this is the code that permits to objects to keep their position while transforming.\n * @param {Function} actionHandler the function to wrap\n * @return {Function} a function with an action handler signature\n */\n\n\n function wrapWithFixedAnchor(actionHandler) {\n return function (eventData, transform, x, y) {\n var target = transform.target,\n centerPoint = target.getCenterPoint(),\n constraint = target.translateToOriginPoint(centerPoint, transform.originX, transform.originY),\n actionPerformed = actionHandler(eventData, transform, x, y);\n target.setPositionByOrigin(constraint, transform.originX, transform.originY);\n return actionPerformed;\n };\n }\n /**\n * Transforms a point described by x and y in a distance from the top left corner of the object\n * bounding box.\n * @param {Object} transform\n * @param {String} originX\n * @param {String} originY\n * @param {number} x\n * @param {number} y\n * @return {Fabric.Point} the normalized point\n */\n\n\n function getLocalPoint(transform, originX, originY, x, y) {\n var target = transform.target,\n control = target.controls[transform.corner],\n zoom = target.canvas.getZoom(),\n padding = target.padding / zoom,\n localPoint = target.toLocalPoint(new fabric.Point(x, y), originX, originY);\n\n if (localPoint.x >= padding) {\n localPoint.x -= padding;\n }\n\n if (localPoint.x <= -padding) {\n localPoint.x += padding;\n }\n\n if (localPoint.y >= padding) {\n localPoint.y -= padding;\n }\n\n if (localPoint.y <= padding) {\n localPoint.y += padding;\n }\n\n localPoint.x -= control.offsetX;\n localPoint.y -= control.offsetY;\n return localPoint;\n }\n /**\n * Detect if the fabric object is flipped on one side.\n * @param {fabric.Object} target\n * @return {Boolean} true if one flip, but not two.\n */\n\n\n function targetHasOneFlip(target) {\n return target.flipX && !target.flipY || !target.flipX && target.flipY;\n }\n /**\n * Utility function to compensate the scale factor when skew is applied on both axes\n * @private\n */\n\n\n function compensateScaleForSkew(target, oppositeSkew, scaleToCompensate, axis, reference) {\n if (target[oppositeSkew] !== 0) {\n var newDim = target._getTransformedDimensions()[axis];\n\n var newValue = reference / newDim * target[scaleToCompensate];\n target.set(scaleToCompensate, newValue);\n }\n }\n /**\n * Action handler for skewing on the X axis\n * @private\n */\n\n\n function skewObjectX(eventData, transform, x, y) {\n var target = transform.target,\n // find how big the object would be, if there was no skewX. takes in account scaling\n dimNoSkew = target._getTransformedDimensions(0, target.skewY),\n localPoint = getLocalPoint(transform, transform.originX, transform.originY, x, y),\n // the mouse is in the center of the object, and we want it to stay there.\n // so the object will grow twice as much as the mouse.\n // this makes the skew growth to localPoint * 2 - dimNoSkew.\n totalSkewSize = Math.abs(localPoint.x * 2) - dimNoSkew.x,\n currentSkew = target.skewX,\n newSkew;\n\n if (totalSkewSize < 2) {\n // let's make it easy to go back to position 0.\n newSkew = 0;\n } else {\n newSkew = radiansToDegrees(Math.atan2(totalSkewSize / target.scaleX, dimNoSkew.y / target.scaleY)); // now we have to find the sign of the skew.\n // it mostly depend on the origin of transformation.\n\n if (transform.originX === LEFT && transform.originY === BOTTOM) {\n newSkew = -newSkew;\n }\n\n if (transform.originX === RIGHT && transform.originY === TOP) {\n newSkew = -newSkew;\n }\n\n if (targetHasOneFlip(target)) {\n newSkew = -newSkew;\n }\n }\n\n var hasSkewed = currentSkew !== newSkew;\n\n if (hasSkewed) {\n var dimBeforeSkewing = target._getTransformedDimensions().y;\n\n target.set('skewX', newSkew);\n compensateScaleForSkew(target, 'skewY', 'scaleY', 'y', dimBeforeSkewing);\n fireEvent('skewing', commonEventInfo(eventData, transform, x, y));\n }\n\n return hasSkewed;\n }\n /**\n * Action handler for skewing on the Y axis\n * @private\n */\n\n\n function skewObjectY(eventData, transform, x, y) {\n var target = transform.target,\n // find how big the object would be, if there was no skewX. takes in account scaling\n dimNoSkew = target._getTransformedDimensions(target.skewX, 0),\n localPoint = getLocalPoint(transform, transform.originX, transform.originY, x, y),\n // the mouse is in the center of the object, and we want it to stay there.\n // so the object will grow twice as much as the mouse.\n // this makes the skew growth to localPoint * 2 - dimNoSkew.\n totalSkewSize = Math.abs(localPoint.y * 2) - dimNoSkew.y,\n currentSkew = target.skewY,\n newSkew;\n\n if (totalSkewSize < 2) {\n // let's make it easy to go back to position 0.\n newSkew = 0;\n } else {\n newSkew = radiansToDegrees(Math.atan2(totalSkewSize / target.scaleY, dimNoSkew.x / target.scaleX)); // now we have to find the sign of the skew.\n // it mostly depend on the origin of transformation.\n\n if (transform.originX === LEFT && transform.originY === BOTTOM) {\n newSkew = -newSkew;\n }\n\n if (transform.originX === RIGHT && transform.originY === TOP) {\n newSkew = -newSkew;\n }\n\n if (targetHasOneFlip(target)) {\n newSkew = -newSkew;\n }\n }\n\n var hasSkewed = currentSkew !== newSkew;\n\n if (hasSkewed) {\n var dimBeforeSkewing = target._getTransformedDimensions().x;\n\n target.set('skewY', newSkew);\n compensateScaleForSkew(target, 'skewX', 'scaleX', 'x', dimBeforeSkewing);\n fireEvent('skewing', commonEventInfo(eventData, transform, x, y));\n }\n\n return hasSkewed;\n }\n /**\n * Wrapped Action handler for skewing on the Y axis, takes care of the\n * skew direction and determine the correct transform origin for the anchor point\n * @param {Event} eventData javascript event that is doing the transform\n * @param {Object} transform javascript object containing a series of information around the current transform\n * @param {number} x current mouse x position, canvas normalized\n * @param {number} y current mouse y position, canvas normalized\n * @return {Boolean} true if some change happened\n */\n\n\n function skewHandlerX(eventData, transform, x, y) {\n // step1 figure out and change transform origin.\n // if skewX > 0 and originY bottom we anchor on right\n // if skewX > 0 and originY top we anchor on left\n // if skewX < 0 and originY bottom we anchor on left\n // if skewX < 0 and originY top we anchor on right\n // if skewX is 0, we look for mouse position to understand where are we going.\n var target = transform.target,\n currentSkew = target.skewX,\n originX,\n originY = transform.originY;\n\n if (target.lockSkewingX) {\n return false;\n }\n\n if (currentSkew === 0) {\n var localPointFromCenter = getLocalPoint(transform, CENTER, CENTER, x, y);\n\n if (localPointFromCenter.x > 0) {\n // we are pulling right, anchor left;\n originX = LEFT;\n } else {\n // we are pulling right, anchor right\n originX = RIGHT;\n }\n } else {\n if (currentSkew > 0) {\n originX = originY === TOP ? LEFT : RIGHT;\n }\n\n if (currentSkew < 0) {\n originX = originY === TOP ? RIGHT : LEFT;\n } // is the object flipped on one side only? swap the origin.\n\n\n if (targetHasOneFlip(target)) {\n originX = originX === LEFT ? RIGHT : LEFT;\n }\n } // once we have the origin, we find the anchor point\n\n\n transform.originX = originX;\n var finalHandler = wrapWithFixedAnchor(skewObjectX);\n return finalHandler(eventData, transform, x, y);\n }\n /**\n * Wrapped Action handler for skewing on the Y axis, takes care of the\n * skew direction and determine the correct transform origin for the anchor point\n * @param {Event} eventData javascript event that is doing the transform\n * @param {Object} transform javascript object containing a series of information around the current transform\n * @param {number} x current mouse x position, canvas normalized\n * @param {number} y current mouse y position, canvas normalized\n * @return {Boolean} true if some change happened\n */\n\n\n function skewHandlerY(eventData, transform, x, y) {\n // step1 figure out and change transform origin.\n // if skewY > 0 and originX left we anchor on top\n // if skewY > 0 and originX right we anchor on bottom\n // if skewY < 0 and originX left we anchor on bottom\n // if skewY < 0 and originX right we anchor on top\n // if skewY is 0, we look for mouse position to understand where are we going.\n var target = transform.target,\n currentSkew = target.skewY,\n originY,\n originX = transform.originX;\n\n if (target.lockSkewingY) {\n return false;\n }\n\n if (currentSkew === 0) {\n var localPointFromCenter = getLocalPoint(transform, CENTER, CENTER, x, y);\n\n if (localPointFromCenter.y > 0) {\n // we are pulling down, anchor up;\n originY = TOP;\n } else {\n // we are pulling up, anchor down\n originY = BOTTOM;\n }\n } else {\n if (currentSkew > 0) {\n originY = originX === LEFT ? TOP : BOTTOM;\n }\n\n if (currentSkew < 0) {\n originY = originX === LEFT ? BOTTOM : TOP;\n } // is the object flipped on one side only? swap the origin.\n\n\n if (targetHasOneFlip(target)) {\n originY = originY === TOP ? BOTTOM : TOP;\n }\n } // once we have the origin, we find the anchor point\n\n\n transform.originY = originY;\n var finalHandler = wrapWithFixedAnchor(skewObjectY);\n return finalHandler(eventData, transform, x, y);\n }\n /**\n * Action handler for rotation and snapping, without anchor point.\n * Needs to be wrapped with `wrapWithFixedAnchor` to be effective\n * @param {Event} eventData javascript event that is doing the transform\n * @param {Object} transform javascript object containing a series of information around the current transform\n * @param {number} x current mouse x position, canvas normalized\n * @param {number} y current mouse y position, canvas normalized\n * @return {Boolean} true if some change happened\n * @private\n */\n\n\n function rotationWithSnapping(eventData, transform, x, y) {\n var t = transform,\n target = t.target,\n pivotPoint = target.translateToOriginPoint(target.getCenterPoint(), t.originX, t.originY);\n\n if (target.lockRotation) {\n return false;\n }\n\n var lastAngle = Math.atan2(t.ey - pivotPoint.y, t.ex - pivotPoint.x),\n curAngle = Math.atan2(y - pivotPoint.y, x - pivotPoint.x),\n angle = radiansToDegrees(curAngle - lastAngle + t.theta),\n hasRotated = true;\n\n if (target.snapAngle > 0) {\n var snapAngle = target.snapAngle,\n snapThreshold = target.snapThreshold || snapAngle,\n rightAngleLocked = Math.ceil(angle / snapAngle) * snapAngle,\n leftAngleLocked = Math.floor(angle / snapAngle) * snapAngle;\n\n if (Math.abs(angle - leftAngleLocked) < snapThreshold) {\n angle = leftAngleLocked;\n } else if (Math.abs(angle - rightAngleLocked) < snapThreshold) {\n angle = rightAngleLocked;\n }\n } // normalize angle to positive value\n\n\n if (angle < 0) {\n angle = 360 + angle;\n }\n\n angle %= 360;\n hasRotated = target.angle !== angle;\n target.angle = angle;\n\n if (hasRotated) {\n fireEvent('rotating', commonEventInfo(eventData, transform, x, y));\n }\n\n return hasRotated;\n }\n /**\n * Basic scaling logic, reused with different constrain for scaling X,Y, freely or equally.\n * Needs to be wrapped with `wrapWithFixedAnchor` to be effective\n * @param {Event} eventData javascript event that is doing the transform\n * @param {Object} transform javascript object containing a series of information around the current transform\n * @param {number} x current mouse x position, canvas normalized\n * @param {number} y current mouse y position, canvas normalized\n * @param {Object} options additional information for scaling\n * @param {String} options.by 'x', 'y', 'equally' or '' to indicate type of scaling\n * @return {Boolean} true if some change happened\n * @private\n */\n\n\n function scaleObject(eventData, transform, x, y, options) {\n options = options || {};\n var target = transform.target,\n lockScalingX = target.lockScalingX,\n lockScalingY = target.lockScalingY,\n by = options.by,\n newPoint,\n scaleX,\n scaleY,\n dim,\n scaleProportionally = scaleIsProportional(eventData, target),\n forbidScaling = scalingIsForbidden(target, by, scaleProportionally),\n signX,\n signY,\n gestureScale = transform.gestureScale;\n\n if (forbidScaling) {\n return false;\n }\n\n if (gestureScale) {\n scaleX = transform.scaleX * gestureScale;\n scaleY = transform.scaleY * gestureScale;\n } else {\n newPoint = getLocalPoint(transform, transform.originX, transform.originY, x, y); // use of sign: We use sign to detect change of direction of an action. sign usually change when\n // we cross the origin point with the mouse. So a scale flip for example. There is an issue when scaling\n // by center and scaling using one middle control ( default: mr, mt, ml, mb), the mouse movement can easily\n // cross many time the origin point and flip the object. so we need a way to filter out the noise.\n // This ternary here should be ok to filter out X scaling when we want Y only and vice versa.\n\n signX = by !== 'y' ? sign(newPoint.x) : 1;\n signY = by !== 'x' ? sign(newPoint.y) : 1;\n\n if (!transform.signX) {\n transform.signX = signX;\n }\n\n if (!transform.signY) {\n transform.signY = signY;\n }\n\n if (target.lockScalingFlip && (transform.signX !== signX || transform.signY !== signY)) {\n return false;\n }\n\n dim = target._getTransformedDimensions(); // missing detection of flip and logic to switch the origin\n\n if (scaleProportionally && !by) {\n // uniform scaling\n var distance = Math.abs(newPoint.x) + Math.abs(newPoint.y),\n original = transform.original,\n originalDistance = Math.abs(dim.x * original.scaleX / target.scaleX) + Math.abs(dim.y * original.scaleY / target.scaleY),\n scale = distance / originalDistance,\n hasScaled;\n scaleX = original.scaleX * scale;\n scaleY = original.scaleY * scale;\n } else {\n scaleX = Math.abs(newPoint.x * target.scaleX / dim.x);\n scaleY = Math.abs(newPoint.y * target.scaleY / dim.y);\n } // if we are scaling by center, we need to double the scale\n\n\n if (isTransformCentered(transform)) {\n scaleX *= 2;\n scaleY *= 2;\n }\n\n if (transform.signX !== signX && by !== 'y') {\n transform.originX = opposite[transform.originX];\n scaleX *= -1;\n transform.signX = signX;\n }\n\n if (transform.signY !== signY && by !== 'x') {\n transform.originY = opposite[transform.originY];\n scaleY *= -1;\n transform.signY = signY;\n }\n } // minScale is taken are in the setter.\n\n\n var oldScaleX = target.scaleX,\n oldScaleY = target.scaleY;\n\n if (!by) {\n !lockScalingX && target.set('scaleX', scaleX);\n !lockScalingY && target.set('scaleY', scaleY);\n } else {\n // forbidden cases already handled on top here.\n by === 'x' && target.set('scaleX', scaleX);\n by === 'y' && target.set('scaleY', scaleY);\n }\n\n hasScaled = oldScaleX !== target.scaleX || oldScaleY !== target.scaleY;\n\n if (hasScaled) {\n fireEvent('scaling', commonEventInfo(eventData, transform, x, y));\n }\n\n return hasScaled;\n }\n /**\n * Generic scaling logic, to scale from corners either equally or freely.\n * Needs to be wrapped with `wrapWithFixedAnchor` to be effective\n * @param {Event} eventData javascript event that is doing the transform\n * @param {Object} transform javascript object containing a series of information around the current transform\n * @param {number} x current mouse x position, canvas normalized\n * @param {number} y current mouse y position, canvas normalized\n * @return {Boolean} true if some change happened\n */\n\n\n function scaleObjectFromCorner(eventData, transform, x, y) {\n return scaleObject(eventData, transform, x, y);\n }\n /**\n * Scaling logic for the X axis.\n * Needs to be wrapped with `wrapWithFixedAnchor` to be effective\n * @param {Event} eventData javascript event that is doing the transform\n * @param {Object} transform javascript object containing a series of information around the current transform\n * @param {number} x current mouse x position, canvas normalized\n * @param {number} y current mouse y position, canvas normalized\n * @return {Boolean} true if some change happened\n */\n\n\n function scaleObjectX(eventData, transform, x, y) {\n return scaleObject(eventData, transform, x, y, {\n by: 'x'\n });\n }\n /**\n * Scaling logic for the Y axis.\n * Needs to be wrapped with `wrapWithFixedAnchor` to be effective\n * @param {Event} eventData javascript event that is doing the transform\n * @param {Object} transform javascript object containing a series of information around the current transform\n * @param {number} x current mouse x position, canvas normalized\n * @param {number} y current mouse y position, canvas normalized\n * @return {Boolean} true if some change happened\n */\n\n\n function scaleObjectY(eventData, transform, x, y) {\n return scaleObject(eventData, transform, x, y, {\n by: 'y'\n });\n }\n /**\n * Composed action handler to either scale Y or skew X\n * Needs to be wrapped with `wrapWithFixedAnchor` to be effective\n * @param {Event} eventData javascript event that is doing the transform\n * @param {Object} transform javascript object containing a series of information around the current transform\n * @param {number} x current mouse x position, canvas normalized\n * @param {number} y current mouse y position, canvas normalized\n * @return {Boolean} true if some change happened\n */\n\n\n function scalingYOrSkewingX(eventData, transform, x, y) {\n // ok some safety needed here.\n if (eventData[transform.target.canvas.altActionKey]) {\n return controls.skewHandlerX(eventData, transform, x, y);\n }\n\n return controls.scalingY(eventData, transform, x, y);\n }\n /**\n * Composed action handler to either scale X or skew Y\n * Needs to be wrapped with `wrapWithFixedAnchor` to be effective\n * @param {Event} eventData javascript event that is doing the transform\n * @param {Object} transform javascript object containing a series of information around the current transform\n * @param {number} x current mouse x position, canvas normalized\n * @param {number} y current mouse y position, canvas normalized\n * @return {Boolean} true if some change happened\n */\n\n\n function scalingXOrSkewingY(eventData, transform, x, y) {\n // ok some safety needed here.\n if (eventData[transform.target.canvas.altActionKey]) {\n return controls.skewHandlerY(eventData, transform, x, y);\n }\n\n return controls.scalingX(eventData, transform, x, y);\n }\n /**\n * Action handler to change textbox width\n * Needs to be wrapped with `wrapWithFixedAnchor` to be effective\n * @param {Event} eventData javascript event that is doing the transform\n * @param {Object} transform javascript object containing a series of information around the current transform\n * @param {number} x current mouse x position, canvas normalized\n * @param {number} y current mouse y position, canvas normalized\n * @return {Boolean} true if some change happened\n */\n\n\n function changeWidth(eventData, transform, x, y) {\n var target = transform.target,\n localPoint = getLocalPoint(transform, transform.originX, transform.originY, x, y),\n strokePadding = target.strokeWidth / (target.strokeUniform ? target.scaleX : 1),\n multiplier = isTransformCentered(transform) ? 2 : 1,\n oldWidth = target.width,\n hasResized,\n newWidth = Math.abs(localPoint.x * multiplier / target.scaleX) - strokePadding;\n target.set('width', Math.max(newWidth, 0));\n hasResized = oldWidth !== newWidth;\n\n if (hasResized) {\n fireEvent('resizing', commonEventInfo(eventData, transform, x, y));\n }\n\n return hasResized;\n }\n /**\n * Action handler\n * @private\n * @param {Event} eventData javascript event that is doing the transform\n * @param {Object} transform javascript object containing a series of information around the current transform\n * @param {number} x current mouse x position, canvas normalized\n * @param {number} y current mouse y position, canvas normalized\n * @return {Boolean} true if the translation occurred\n */\n\n\n function dragHandler(eventData, transform, x, y) {\n var target = transform.target,\n newLeft = x - transform.offsetX,\n newTop = y - transform.offsetY,\n moveX = !target.get('lockMovementX') && target.left !== newLeft,\n moveY = !target.get('lockMovementY') && target.top !== newTop;\n moveX && target.set('left', newLeft);\n moveY && target.set('top', newTop);\n\n if (moveX || moveY) {\n fireEvent('moving', commonEventInfo(eventData, transform, x, y));\n }\n\n return moveX || moveY;\n }\n\n controls.scaleCursorStyleHandler = scaleCursorStyleHandler;\n controls.skewCursorStyleHandler = skewCursorStyleHandler;\n controls.scaleSkewCursorStyleHandler = scaleSkewCursorStyleHandler;\n controls.rotationWithSnapping = wrapWithFixedAnchor(rotationWithSnapping);\n controls.scalingEqually = wrapWithFixedAnchor(scaleObjectFromCorner);\n controls.scalingX = wrapWithFixedAnchor(scaleObjectX);\n controls.scalingY = wrapWithFixedAnchor(scaleObjectY);\n controls.scalingYOrSkewingX = scalingYOrSkewingX;\n controls.scalingXOrSkewingY = scalingXOrSkewingY;\n controls.changeWidth = wrapWithFixedAnchor(changeWidth);\n controls.skewHandlerX = skewHandlerX;\n controls.skewHandlerY = skewHandlerY;\n controls.dragHandler = dragHandler;\n controls.scaleOrSkewActionName = scaleOrSkewActionName;\n controls.rotationStyleHandler = rotationStyleHandler;\n controls.fireEvent = fireEvent;\n controls.wrapWithFixedAnchor = wrapWithFixedAnchor;\n controls.getLocalPoint = getLocalPoint;\n fabric.controlsUtils = controls;\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n degreesToRadians = fabric.util.degreesToRadians,\n controls = fabric.controlsUtils;\n /**\n * Render a round control, as per fabric features.\n * This function is written to respect object properties like transparentCorners, cornerSize\n * cornerColor, cornerStrokeColor\n * plus the addition of offsetY and offsetX.\n * @param {CanvasRenderingContext2D} ctx context to render on\n * @param {Number} left x coordinate where the control center should be\n * @param {Number} top y coordinate where the control center should be\n * @param {Object} styleOverride override for fabric.Object controls style\n * @param {fabric.Object} fabricObject the fabric object for which we are rendering controls\n */\n\n function renderCircleControl(ctx, left, top, styleOverride, fabricObject) {\n styleOverride = styleOverride || {};\n var size = styleOverride.cornerSize || fabricObject.cornerSize,\n transparentCorners = typeof styleOverride.transparentCorners !== 'undefined' ? styleOverride.transparentCorners : this.transparentCorners,\n methodName = transparentCorners ? 'stroke' : 'fill',\n stroke = !transparentCorners && (styleOverride.cornerStrokeColor || fabricObject.cornerStrokeColor);\n ctx.save();\n ctx.fillStyle = styleOverride.cornerColor || fabricObject.cornerColor;\n ctx.strokeStyle = styleOverride.cornerStrokeColor || fabricObject.cornerStrokeColor; // this is still wrong\n\n ctx.lineWidth = 1;\n ctx.beginPath();\n ctx.arc(left, top, size / 2, 0, 2 * Math.PI, false);\n ctx[methodName]();\n\n if (stroke) {\n ctx.stroke();\n }\n\n ctx.restore();\n }\n /**\n * Render a square control, as per fabric features.\n * This function is written to respect object properties like transparentCorners, cornerSize\n * cornerColor, cornerStrokeColor\n * plus the addition of offsetY and offsetX.\n * @param {CanvasRenderingContext2D} ctx context to render on\n * @param {Number} left x coordinate where the control center should be\n * @param {Number} top y coordinate where the control center should be\n * @param {Object} styleOverride override for fabric.Object controls style\n * @param {fabric.Object} fabricObject the fabric object for which we are rendering controls\n */\n\n\n function renderSquareControl(ctx, left, top, styleOverride, fabricObject) {\n styleOverride = styleOverride || {};\n var size = styleOverride.cornerSize || fabricObject.cornerSize,\n transparentCorners = typeof styleOverride.transparentCorners !== 'undefined' ? styleOverride.transparentCorners : fabricObject.transparentCorners,\n methodName = transparentCorners ? 'stroke' : 'fill',\n stroke = !transparentCorners && (styleOverride.cornerStrokeColor || fabricObject.cornerStrokeColor),\n sizeBy2 = size / 2;\n ctx.save();\n ctx.fillStyle = styleOverride.cornerColor || fabricObject.cornerColor;\n ctx.strokeStyle = styleOverride.strokeCornerColor || fabricObject.strokeCornerColor; // this is still wrong\n\n ctx.lineWidth = 1;\n ctx.translate(left, top);\n ctx.rotate(degreesToRadians(fabricObject.angle)); // this does not work, and fixed with ( && ) does not make sense.\n // to have real transparent corners we need the controls on upperCanvas\n // transparentCorners || ctx.clearRect(-sizeBy2, -sizeBy2, size, size);\n\n ctx[methodName + 'Rect'](-sizeBy2, -sizeBy2, size, size);\n\n if (stroke) {\n ctx.strokeRect(-sizeBy2, -sizeBy2, size, size);\n }\n\n ctx.restore();\n }\n\n controls.renderCircleControl = renderCircleControl;\n controls.renderSquareControl = renderSquareControl;\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {});\n\n function Control(options) {\n for (var i in options) {\n this[i] = options[i];\n }\n }\n\n fabric.Control = Control;\n fabric.Control.prototype =\n /** @lends fabric.Control.prototype */\n {\n /**\n * keep track of control visibility.\n * mainly for backward compatibility.\n * if you do not want to see a control, you can remove it\n * from the controlset.\n * @type {Boolean}\n * @default true\n */\n visible: true,\n\n /**\n * Name of the action that the controll will likely execute.\n * This is optional. FabricJS uses to identify what the user is doing for some\n * extra optimizations. If you are writing a custom control and you want to know\n * somewhere else in the code what is going on, you can use this string here.\n * you can also provide a custom getActionName if your control run multiple actions\n * depending on some external state.\n * default to scale since is the most common, used on 4 corners by default\n * @type {String}\n * @default 'scale'\n */\n actionName: 'scale',\n\n /**\n * Drawing angle of the control.\n * NOT used for now, but name marked as needed for internal logic\n * example: to reuse the same drawing function for different rotated controls\n * @type {Number}\n * @default 0\n */\n angle: 0,\n\n /**\n * Relative position of the control. X\n * 0,0 is the center of the Object, while -0.5 (left) or 0.5 (right) are the extremities\n * of the bounding box.\n * @type {Number}\n * @default 0\n */\n x: 0,\n\n /**\n * Relative position of the control. Y\n * 0,0 is the center of the Object, while -0.5 (top) or 0.5 (bottom) are the extremities\n * of the bounding box.\n * @type {Number}\n * @default 0\n */\n y: 0,\n\n /**\n * Horizontal offset of the control from the defined position. In pixels\n * Positive offset moves the control to the right, negative to the left.\n * It used when you want to have position of control that does not scale with\n * the bounding box. Example: rotation control is placed at x:0, y: 0.5 on\n * the boundindbox, with an offset of 30 pixels vertivally. Those 30 pixels will\n * stay 30 pixels no matter how the object is big. Another example is having 2\n * controls in the corner, that stay in the same position when the object scale.\n * of the bounding box.\n * @type {Number}\n * @default 0\n */\n offsetX: 0,\n\n /**\n * Vertical offset of the control from the defined position. In pixels\n * Positive offset moves the control to the bottom, negative to the top.\n * @type {Number}\n * @default 0\n */\n offsetY: 0,\n\n /**\n * Css cursor style to display when the control is hovered.\n * if the method `cursorStyleHandler` is provided, this property is ignored.\n * @type {String}\n * @default 'crosshair'\n */\n cursorStyle: 'crosshair',\n\n /**\n * If controls has an offsetY or offsetX, draw a line that connects\n * the control to the bounding box\n * @type {Boolean}\n * @default false\n */\n withConnection: false,\n\n /**\n * The control actionHandler, provide one to handle action ( control being moved )\n * @param {Event} eventData the native mouse event\n * @param {Object} transformData properties of the current transform\n * @param {fabric.Object} object on which the control is displayed\n * @return {Function}\n */\n actionHandler: function ()\n /* eventData, transformData, fabricObject */\n {},\n\n /**\n * The control handler for mouse down, provide one to handle mouse down on control\n * @param {Event} eventData the native mouse event\n * @param {Object} transformData properties of the current transform\n * @param {fabric.Object} object on which the control is displayed\n * @return {Function}\n */\n mouseDownHandler: function ()\n /* eventData, transformData, fabricObject */\n {},\n\n /**\n * The control mouseUpHandler, provide one to handle an effect on mouse up.\n * @param {Event} eventData the native mouse event\n * @param {Object} transformData properties of the current transform\n * @param {fabric.Object} object on which the control is displayed\n * @return {Function}\n */\n mouseUpHandler: function ()\n /* eventData, transformData, fabricObject */\n {},\n\n /**\n * Returns control actionHandler\n * @param {Event} eventData the native mouse event\n * @param {Object} transformData properties of the current transform\n * @param {fabric.Object} object on which the control is displayed\n * @return {Function}\n */\n getActionHandler: function ()\n /* eventData, transformData, fabricObject */\n {\n return this.actionHandler;\n },\n\n /**\n * Returns control mouseDown handler\n * @param {Event} eventData the native mouse event\n * @param {Object} transformData properties of the current transform\n * @param {fabric.Object} object on which the control is displayed\n * @return {Function}\n */\n getMouseDownHandler: function ()\n /* eventData, fabricObject, control */\n {\n return this.mouseDownHandler;\n },\n\n /**\n * Returns control mouseUp handler\n * @param {Event} eventData the native mouse event\n * @param {Object} transformData properties of the current transform\n * @param {fabric.Object} object on which the control is displayed\n * @return {Function}\n */\n getMouseUpHandler: function ()\n /* eventData, fabricObject, control */\n {\n return this.mouseUpHandler;\n },\n\n /**\n * Returns control cursorStyle for css using cursorStyle. If you need a more elaborate\n * function you can pass one in the constructor\n * the cursorStyle property\n * @param {Event} eventData the native mouse event\n * @param {fabric.Control} control the current control ( likely this)\n * @param {fabric.Object} object on which the control is displayed\n * @return {String}\n */\n cursorStyleHandler: function (eventData, control\n /* fabricObject */\n ) {\n return control.cursorStyle;\n },\n\n /**\n * Returns the action name. The basic implementation just return the actionName property.\n * @param {Event} eventData the native mouse event\n * @param {fabric.Control} control the current control ( likely this)\n * @param {fabric.Object} object on which the control is displayed\n * @return {String}\n */\n getActionName: function (eventData, control\n /* fabricObject */\n ) {\n return control.actionName;\n },\n\n /**\n * Returns controls visibility\n * @param {fabric.Object} object on which the control is displayed\n * @param {String} controlKey key where the control is memorized on the\n * @return {Boolean}\n */\n getVisibility: function (fabricObject, controlKey) {\n var objectVisibility = fabricObject._controlsVisibility;\n\n if (objectVisibility && typeof objectVisibility[controlKey] !== 'undefined') {\n return objectVisibility[controlKey];\n }\n\n return this.visible;\n },\n\n /**\n * Sets controls visibility\n * @param {Boolean} visibility for the object\n * @return {Void}\n */\n setVisibility: function (visibility\n /* name, fabricObject */\n ) {\n this.visible = visibility;\n },\n positionHandler: function (dim, finalMatrix\n /*, fabricObject, currentControl */\n ) {\n var point = fabric.util.transformPoint({\n x: this.x * dim.x + this.offsetX,\n y: this.y * dim.y + this.offsetY\n }, finalMatrix);\n return point;\n },\n\n /**\n * Render function for the control.\n * When this function runs the context is unscaled. unrotate. Just retina scaled.\n * all the functions will have to translate to the point left,top before starting Drawing\n * if they want to draw a control where the position is detected.\n * left and top are the result of the positionHandler function\n * @param {RenderingContext2D} ctx the context where the control will be drawn\n * @param {Number} left position of the canvas where we are about to render the control.\n * @param {Number} top position of the canvas where we are about to render the control.\n * @param {Object} styleOverride\n * @param {fabric.Object} fabricObject the object where the control is about to be rendered\n */\n render: function (ctx, left, top, styleOverride, fabricObject) {\n styleOverride = styleOverride || {};\n\n switch (styleOverride.cornerStyle || fabricObject.cornerStyle) {\n case 'circle':\n fabric.controlsUtils.renderCircleControl.call(this, ctx, left, top, styleOverride, fabricObject);\n break;\n\n default:\n fabric.controlsUtils.renderSquareControl.call(this, ctx, left, top, styleOverride, fabricObject);\n }\n }\n };\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function () {\n /* _FROM_SVG_START_ */\n function getColorStop(el, multiplier) {\n var style = el.getAttribute('style'),\n offset = el.getAttribute('offset') || 0,\n color,\n colorAlpha,\n opacity,\n i; // convert percents to absolute values\n\n offset = parseFloat(offset) / (/%$/.test(offset) ? 100 : 1);\n offset = offset < 0 ? 0 : offset > 1 ? 1 : offset;\n\n if (style) {\n var keyValuePairs = style.split(/\\s*;\\s*/);\n\n if (keyValuePairs[keyValuePairs.length - 1] === '') {\n keyValuePairs.pop();\n }\n\n for (i = keyValuePairs.length; i--;) {\n var split = keyValuePairs[i].split(/\\s*:\\s*/),\n key = split[0].trim(),\n value = split[1].trim();\n\n if (key === 'stop-color') {\n color = value;\n } else if (key === 'stop-opacity') {\n opacity = value;\n }\n }\n }\n\n if (!color) {\n color = el.getAttribute('stop-color') || 'rgb(0,0,0)';\n }\n\n if (!opacity) {\n opacity = el.getAttribute('stop-opacity');\n }\n\n color = new fabric.Color(color);\n colorAlpha = color.getAlpha();\n opacity = isNaN(parseFloat(opacity)) ? 1 : parseFloat(opacity);\n opacity *= colorAlpha * multiplier;\n return {\n offset: offset,\n color: color.toRgb(),\n opacity: opacity\n };\n }\n\n function getLinearCoords(el) {\n return {\n x1: el.getAttribute('x1') || 0,\n y1: el.getAttribute('y1') || 0,\n x2: el.getAttribute('x2') || '100%',\n y2: el.getAttribute('y2') || 0\n };\n }\n\n function getRadialCoords(el) {\n return {\n x1: el.getAttribute('fx') || el.getAttribute('cx') || '50%',\n y1: el.getAttribute('fy') || el.getAttribute('cy') || '50%',\n r1: 0,\n x2: el.getAttribute('cx') || '50%',\n y2: el.getAttribute('cy') || '50%',\n r2: el.getAttribute('r') || '50%'\n };\n }\n /* _FROM_SVG_END_ */\n\n\n var clone = fabric.util.object.clone;\n /**\n * Gradient class\n * @class fabric.Gradient\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-2#gradients}\n * @see {@link fabric.Gradient#initialize} for constructor definition\n */\n\n fabric.Gradient = fabric.util.createClass(\n /** @lends fabric.Gradient.prototype */\n {\n /**\n * Horizontal offset for aligning gradients coming from SVG when outside pathgroups\n * @type Number\n * @default 0\n */\n offsetX: 0,\n\n /**\n * Vertical offset for aligning gradients coming from SVG when outside pathgroups\n * @type Number\n * @default 0\n */\n offsetY: 0,\n\n /**\n * A transform matrix to apply to the gradient before painting.\n * Imported from svg gradients, is not applied with the current transform in the center.\n * Before this transform is applied, the origin point is at the top left corner of the object\n * plus the addition of offsetY and offsetX.\n * @type Number[]\n * @default null\n */\n gradientTransform: null,\n\n /**\n * coordinates units for coords.\n * If `pixels`, the number of coords are in the same unit of width / height.\n * If set as `percentage` the coords are still a number, but 1 means 100% of width\n * for the X and 100% of the height for the y. It can be bigger than 1 and negative.\n * allowed values pixels or percentage.\n * @type String\n * @default 'pixels'\n */\n gradientUnits: 'pixels',\n\n /**\n * Gradient type linear or radial\n * @type String\n * @default 'pixels'\n */\n type: 'linear',\n\n /**\n * Constructor\n * @param {Object} options Options object with type, coords, gradientUnits and colorStops\n * @param {Object} [options.type] gradient type linear or radial\n * @param {Object} [options.gradientUnits] gradient units\n * @param {Object} [options.offsetX] SVG import compatibility\n * @param {Object} [options.offsetY] SVG import compatibility\n * @param {Object[]} options.colorStops contains the colorstops.\n * @param {Object} options.coords contains the coords of the gradient\n * @param {Number} [options.coords.x1] X coordiante of the first point for linear or of the focal point for radial\n * @param {Number} [options.coords.y1] Y coordiante of the first point for linear or of the focal point for radial\n * @param {Number} [options.coords.x2] X coordiante of the second point for linear or of the center point for radial\n * @param {Number} [options.coords.y2] Y coordiante of the second point for linear or of the center point for radial\n * @param {Number} [options.coords.r1] only for radial gradient, radius of the inner circle\n * @param {Number} [options.coords.r2] only for radial gradient, radius of the external circle\n * @return {fabric.Gradient} thisArg\n */\n initialize: function (options) {\n options || (options = {});\n options.coords || (options.coords = {});\n\n var coords,\n _this = this; // sets everything, then coords and colorstops get sets again\n\n\n Object.keys(options).forEach(function (option) {\n _this[option] = options[option];\n });\n\n if (this.id) {\n this.id += '_' + fabric.Object.__uid++;\n } else {\n this.id = fabric.Object.__uid++;\n }\n\n coords = {\n x1: options.coords.x1 || 0,\n y1: options.coords.y1 || 0,\n x2: options.coords.x2 || 0,\n y2: options.coords.y2 || 0\n };\n\n if (this.type === 'radial') {\n coords.r1 = options.coords.r1 || 0;\n coords.r2 = options.coords.r2 || 0;\n }\n\n this.coords = coords;\n this.colorStops = options.colorStops.slice();\n },\n\n /**\n * Adds another colorStop\n * @param {Object} colorStop Object with offset and color\n * @return {fabric.Gradient} thisArg\n */\n addColorStop: function (colorStops) {\n for (var position in colorStops) {\n var color = new fabric.Color(colorStops[position]);\n this.colorStops.push({\n offset: parseFloat(position),\n color: color.toRgb(),\n opacity: color.getAlpha()\n });\n }\n\n return this;\n },\n\n /**\n * Returns object representation of a gradient\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object}\n */\n toObject: function (propertiesToInclude) {\n var object = {\n type: this.type,\n coords: this.coords,\n colorStops: this.colorStops,\n offsetX: this.offsetX,\n offsetY: this.offsetY,\n gradientUnits: this.gradientUnits,\n gradientTransform: this.gradientTransform ? this.gradientTransform.concat() : this.gradientTransform\n };\n fabric.util.populateWithProperties(this, object, propertiesToInclude);\n return object;\n },\n\n /* _TO_SVG_START_ */\n\n /**\n * Returns SVG representation of an gradient\n * @param {Object} object Object to create a gradient for\n * @return {String} SVG representation of an gradient (linear/radial)\n */\n toSVG: function (object, options) {\n var coords = clone(this.coords, true),\n i,\n len,\n options = options || {},\n markup,\n commonAttributes,\n colorStops = clone(this.colorStops, true),\n needsSwap = coords.r1 > coords.r2,\n transform = this.gradientTransform ? this.gradientTransform.concat() : fabric.iMatrix.concat(),\n offsetX = -this.offsetX,\n offsetY = -this.offsetY,\n withViewport = !!options.additionalTransform,\n gradientUnits = this.gradientUnits === 'pixels' ? 'userSpaceOnUse' : 'objectBoundingBox'; // colorStops must be sorted ascending\n\n colorStops.sort(function (a, b) {\n return a.offset - b.offset;\n });\n\n if (gradientUnits === 'objectBoundingBox') {\n offsetX /= object.width;\n offsetY /= object.height;\n } else {\n offsetX += object.width / 2;\n offsetY += object.height / 2;\n }\n\n if (object.type === 'path') {\n offsetX -= object.pathOffset.x;\n offsetY -= object.pathOffset.y;\n }\n\n transform[4] -= offsetX;\n transform[5] -= offsetY;\n commonAttributes = 'id=\"SVGID_' + this.id + '\" gradientUnits=\"' + gradientUnits + '\"';\n commonAttributes += ' gradientTransform=\"' + (withViewport ? options.additionalTransform + ' ' : '') + fabric.util.matrixToSVG(transform) + '\" ';\n\n if (this.type === 'linear') {\n markup = ['<linearGradient ', commonAttributes, ' x1=\"', coords.x1, '\" y1=\"', coords.y1, '\" x2=\"', coords.x2, '\" y2=\"', coords.y2, '\">\\n'];\n } else if (this.type === 'radial') {\n // svg radial gradient has just 1 radius. the biggest.\n markup = ['<radialGradient ', commonAttributes, ' cx=\"', needsSwap ? coords.x1 : coords.x2, '\" cy=\"', needsSwap ? coords.y1 : coords.y2, '\" r=\"', needsSwap ? coords.r1 : coords.r2, '\" fx=\"', needsSwap ? coords.x2 : coords.x1, '\" fy=\"', needsSwap ? coords.y2 : coords.y1, '\">\\n'];\n }\n\n if (this.type === 'radial') {\n if (needsSwap) {\n // svg goes from internal to external radius. if radius are inverted, swap color stops.\n colorStops = colorStops.concat();\n colorStops.reverse();\n\n for (i = 0, len = colorStops.length; i < len; i++) {\n colorStops[i].offset = 1 - colorStops[i].offset;\n }\n }\n\n var minRadius = Math.min(coords.r1, coords.r2);\n\n if (minRadius > 0) {\n // i have to shift all colorStops and add new one in 0.\n var maxRadius = Math.max(coords.r1, coords.r2),\n percentageShift = minRadius / maxRadius;\n\n for (i = 0, len = colorStops.length; i < len; i++) {\n colorStops[i].offset += percentageShift * (1 - colorStops[i].offset);\n }\n }\n }\n\n for (i = 0, len = colorStops.length; i < len; i++) {\n var colorStop = colorStops[i];\n markup.push('<stop ', 'offset=\"', colorStop.offset * 100 + '%', '\" style=\"stop-color:', colorStop.color, typeof colorStop.opacity !== 'undefined' ? ';stop-opacity: ' + colorStop.opacity : ';', '\"/>\\n');\n }\n\n markup.push(this.type === 'linear' ? '</linearGradient>\\n' : '</radialGradient>\\n');\n return markup.join('');\n },\n\n /* _TO_SVG_END_ */\n\n /**\n * Returns an instance of CanvasGradient\n * @param {CanvasRenderingContext2D} ctx Context to render on\n * @return {CanvasGradient}\n */\n toLive: function (ctx) {\n var gradient,\n coords = fabric.util.object.clone(this.coords),\n i,\n len;\n\n if (!this.type) {\n return;\n }\n\n if (this.type === 'linear') {\n gradient = ctx.createLinearGradient(coords.x1, coords.y1, coords.x2, coords.y2);\n } else if (this.type === 'radial') {\n gradient = ctx.createRadialGradient(coords.x1, coords.y1, coords.r1, coords.x2, coords.y2, coords.r2);\n }\n\n for (i = 0, len = this.colorStops.length; i < len; i++) {\n var color = this.colorStops[i].color,\n opacity = this.colorStops[i].opacity,\n offset = this.colorStops[i].offset;\n\n if (typeof opacity !== 'undefined') {\n color = new fabric.Color(color).setAlpha(opacity).toRgba();\n }\n\n gradient.addColorStop(offset, color);\n }\n\n return gradient;\n }\n });\n fabric.util.object.extend(fabric.Gradient, {\n /* _FROM_SVG_START_ */\n\n /**\n * Returns {@link fabric.Gradient} instance from an SVG element\n * @static\n * @memberOf fabric.Gradient\n * @param {SVGGradientElement} el SVG gradient element\n * @param {fabric.Object} instance\n * @param {String} opacityAttr A fill-opacity or stroke-opacity attribute to multiply to each stop's opacity.\n * @param {Object} svgOptions an object containing the size of the SVG in order to parse correctly graidents\n * that uses gradientUnits as 'userSpaceOnUse' and percentages.\n * @param {Object.number} viewBoxWidth width part of the viewBox attribute on svg\n * @param {Object.number} viewBoxHeight height part of the viewBox attribute on svg\n * @param {Object.number} width width part of the svg tag if viewBox is not specified\n * @param {Object.number} height height part of the svg tag if viewBox is not specified\n * @return {fabric.Gradient} Gradient instance\n * @see http://www.w3.org/TR/SVG/pservers.html#LinearGradientElement\n * @see http://www.w3.org/TR/SVG/pservers.html#RadialGradientElement\n */\n fromElement: function (el, instance, opacityAttr, svgOptions) {\n /**\n * @example:\n *\n * <linearGradient id=\"linearGrad1\">\n * <stop offset=\"0%\" stop-color=\"white\"/>\n * <stop offset=\"100%\" stop-color=\"black\"/>\n * </linearGradient>\n *\n * OR\n *\n * <linearGradient id=\"linearGrad2\">\n * <stop offset=\"0\" style=\"stop-color:rgb(255,255,255)\"/>\n * <stop offset=\"1\" style=\"stop-color:rgb(0,0,0)\"/>\n * </linearGradient>\n *\n * OR\n *\n * <radialGradient id=\"radialGrad1\">\n * <stop offset=\"0%\" stop-color=\"white\" stop-opacity=\"1\" />\n * <stop offset=\"50%\" stop-color=\"black\" stop-opacity=\"0.5\" />\n * <stop offset=\"100%\" stop-color=\"white\" stop-opacity=\"1\" />\n * </radialGradient>\n *\n * OR\n *\n * <radialGradient id=\"radialGrad2\">\n * <stop offset=\"0\" stop-color=\"rgb(255,255,255)\" />\n * <stop offset=\"0.5\" stop-color=\"rgb(0,0,0)\" />\n * <stop offset=\"1\" stop-color=\"rgb(255,255,255)\" />\n * </radialGradient>\n *\n */\n var multiplier = parseFloat(opacityAttr) / (/%$/.test(opacityAttr) ? 100 : 1);\n multiplier = multiplier < 0 ? 0 : multiplier > 1 ? 1 : multiplier;\n\n if (isNaN(multiplier)) {\n multiplier = 1;\n }\n\n var colorStopEls = el.getElementsByTagName('stop'),\n type,\n gradientUnits = el.getAttribute('gradientUnits') === 'userSpaceOnUse' ? 'pixels' : 'percentage',\n gradientTransform = el.getAttribute('gradientTransform') || '',\n colorStops = [],\n coords,\n i,\n offsetX = 0,\n offsetY = 0,\n transformMatrix;\n\n if (el.nodeName === 'linearGradient' || el.nodeName === 'LINEARGRADIENT') {\n type = 'linear';\n coords = getLinearCoords(el);\n } else {\n type = 'radial';\n coords = getRadialCoords(el);\n }\n\n for (i = colorStopEls.length; i--;) {\n colorStops.push(getColorStop(colorStopEls[i], multiplier));\n }\n\n transformMatrix = fabric.parseTransformAttribute(gradientTransform);\n\n __convertPercentUnitsToValues(instance, coords, svgOptions, gradientUnits);\n\n if (gradientUnits === 'pixels') {\n offsetX = -instance.left;\n offsetY = -instance.top;\n }\n\n var gradient = new fabric.Gradient({\n id: el.getAttribute('id'),\n type: type,\n coords: coords,\n colorStops: colorStops,\n gradientUnits: gradientUnits,\n gradientTransform: transformMatrix,\n offsetX: offsetX,\n offsetY: offsetY\n });\n return gradient;\n }\n /* _FROM_SVG_END_ */\n\n });\n /**\n * @private\n */\n\n function __convertPercentUnitsToValues(instance, options, svgOptions, gradientUnits) {\n var propValue, finalValue;\n Object.keys(options).forEach(function (prop) {\n propValue = options[prop];\n\n if (propValue === 'Infinity') {\n finalValue = 1;\n } else if (propValue === '-Infinity') {\n finalValue = 0;\n } else {\n finalValue = parseFloat(options[prop], 10);\n\n if (typeof propValue === 'string' && /^(\\d+\\.\\d+)%|(\\d+)%$/.test(propValue)) {\n finalValue *= 0.01;\n\n if (gradientUnits === 'pixels') {\n // then we need to fix those percentages here in svg parsing\n if (prop === 'x1' || prop === 'x2' || prop === 'r2') {\n finalValue *= svgOptions.viewBoxWidth || svgOptions.width;\n }\n\n if (prop === 'y1' || prop === 'y2') {\n finalValue *= svgOptions.viewBoxHeight || svgOptions.height;\n }\n }\n }\n }\n\n options[prop] = finalValue;\n });\n }\n})();\n\n(function () {\n 'use strict';\n\n var toFixed = fabric.util.toFixed;\n /**\n * Pattern class\n * @class fabric.Pattern\n * @see {@link http://fabricjs.com/patterns|Pattern demo}\n * @see {@link http://fabricjs.com/dynamic-patterns|DynamicPattern demo}\n * @see {@link fabric.Pattern#initialize} for constructor definition\n */\n\n fabric.Pattern = fabric.util.createClass(\n /** @lends fabric.Pattern.prototype */\n {\n /**\n * Repeat property of a pattern (one of repeat, repeat-x, repeat-y or no-repeat)\n * @type String\n * @default\n */\n repeat: 'repeat',\n\n /**\n * Pattern horizontal offset from object's left/top corner\n * @type Number\n * @default\n */\n offsetX: 0,\n\n /**\n * Pattern vertical offset from object's left/top corner\n * @type Number\n * @default\n */\n offsetY: 0,\n\n /**\n * crossOrigin value (one of \"\", \"anonymous\", \"use-credentials\")\n * @see https://developer.mozilla.org/en-US/docs/HTML/CORS_settings_attributes\n * @type String\n * @default\n */\n crossOrigin: '',\n\n /**\n * transform matrix to change the pattern, imported from svgs.\n * @type Array\n * @default\n */\n patternTransform: null,\n\n /**\n * Constructor\n * @param {Object} [options] Options object\n * @param {Function} [callback] function to invoke after callback init.\n * @return {fabric.Pattern} thisArg\n */\n initialize: function (options, callback) {\n options || (options = {});\n this.id = fabric.Object.__uid++;\n this.setOptions(options);\n\n if (!options.source || options.source && typeof options.source !== 'string') {\n callback && callback(this);\n return;\n } else {\n // img src string\n var _this = this;\n\n this.source = fabric.util.createImage();\n fabric.util.loadImage(options.source, function (img, isError) {\n _this.source = img;\n callback && callback(_this, isError);\n }, null, this.crossOrigin);\n }\n },\n\n /**\n * Returns object representation of a pattern\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} Object representation of a pattern instance\n */\n toObject: function (propertiesToInclude) {\n var NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS,\n source,\n object; // <img> element\n\n if (typeof this.source.src === 'string') {\n source = this.source.src;\n } // <canvas> element\n else if (typeof this.source === 'object' && this.source.toDataURL) {\n source = this.source.toDataURL();\n }\n\n object = {\n type: 'pattern',\n source: source,\n repeat: this.repeat,\n crossOrigin: this.crossOrigin,\n offsetX: toFixed(this.offsetX, NUM_FRACTION_DIGITS),\n offsetY: toFixed(this.offsetY, NUM_FRACTION_DIGITS),\n patternTransform: this.patternTransform ? this.patternTransform.concat() : null\n };\n fabric.util.populateWithProperties(this, object, propertiesToInclude);\n return object;\n },\n\n /* _TO_SVG_START_ */\n\n /**\n * Returns SVG representation of a pattern\n * @param {fabric.Object} object\n * @return {String} SVG representation of a pattern\n */\n toSVG: function (object) {\n var patternSource = typeof this.source === 'function' ? this.source() : this.source,\n patternWidth = patternSource.width / object.width,\n patternHeight = patternSource.height / object.height,\n patternOffsetX = this.offsetX / object.width,\n patternOffsetY = this.offsetY / object.height,\n patternImgSrc = '';\n\n if (this.repeat === 'repeat-x' || this.repeat === 'no-repeat') {\n patternHeight = 1;\n\n if (patternOffsetY) {\n patternHeight += Math.abs(patternOffsetY);\n }\n }\n\n if (this.repeat === 'repeat-y' || this.repeat === 'no-repeat') {\n patternWidth = 1;\n\n if (patternOffsetX) {\n patternWidth += Math.abs(patternOffsetX);\n }\n }\n\n if (patternSource.src) {\n patternImgSrc = patternSource.src;\n } else if (patternSource.toDataURL) {\n patternImgSrc = patternSource.toDataURL();\n }\n\n return '<pattern id=\"SVGID_' + this.id + '\" x=\"' + patternOffsetX + '\" y=\"' + patternOffsetY + '\" width=\"' + patternWidth + '\" height=\"' + patternHeight + '\">\\n' + '<image x=\"0\" y=\"0\"' + ' width=\"' + patternSource.width + '\" height=\"' + patternSource.height + '\" xlink:href=\"' + patternImgSrc + '\"></image>\\n' + '</pattern>\\n';\n },\n\n /* _TO_SVG_END_ */\n setOptions: function (options) {\n for (var prop in options) {\n this[prop] = options[prop];\n }\n },\n\n /**\n * Returns an instance of CanvasPattern\n * @param {CanvasRenderingContext2D} ctx Context to create pattern\n * @return {CanvasPattern}\n */\n toLive: function (ctx) {\n var source = this.source; // if the image failed to load, return, and allow rest to continue loading\n\n if (!source) {\n return '';\n } // if an image\n\n\n if (typeof source.src !== 'undefined') {\n if (!source.complete) {\n return '';\n }\n\n if (source.naturalWidth === 0 || source.naturalHeight === 0) {\n return '';\n }\n }\n\n return ctx.createPattern(source, this.repeat);\n }\n });\n})();\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n toFixed = fabric.util.toFixed;\n\n if (fabric.Shadow) {\n fabric.warn('fabric.Shadow is already defined.');\n return;\n }\n /**\n * Shadow class\n * @class fabric.Shadow\n * @see {@link http://fabricjs.com/shadows|Shadow demo}\n * @see {@link fabric.Shadow#initialize} for constructor definition\n */\n\n\n fabric.Shadow = fabric.util.createClass(\n /** @lends fabric.Shadow.prototype */\n {\n /**\n * Shadow color\n * @type String\n * @default\n */\n color: 'rgb(0,0,0)',\n\n /**\n * Shadow blur\n * @type Number\n */\n blur: 0,\n\n /**\n * Shadow horizontal offset\n * @type Number\n * @default\n */\n offsetX: 0,\n\n /**\n * Shadow vertical offset\n * @type Number\n * @default\n */\n offsetY: 0,\n\n /**\n * Whether the shadow should affect stroke operations\n * @type Boolean\n * @default\n */\n affectStroke: false,\n\n /**\n * Indicates whether toObject should include default values\n * @type Boolean\n * @default\n */\n includeDefaultValues: true,\n\n /**\n * When `false`, the shadow will scale with the object.\n * When `true`, the shadow's offsetX, offsetY, and blur will not be affected by the object's scale.\n * default to false\n * @type Boolean\n * @default\n */\n nonScaling: false,\n\n /**\n * Constructor\n * @param {Object|String} [options] Options object with any of color, blur, offsetX, offsetY properties or string (e.g. \"rgba(0,0,0,0.2) 2px 2px 10px\")\n * @return {fabric.Shadow} thisArg\n */\n initialize: function (options) {\n if (typeof options === 'string') {\n options = this._parseShadow(options);\n }\n\n for (var prop in options) {\n this[prop] = options[prop];\n }\n\n this.id = fabric.Object.__uid++;\n },\n\n /**\n * @private\n * @param {String} shadow Shadow value to parse\n * @return {Object} Shadow object with color, offsetX, offsetY and blur\n */\n _parseShadow: function (shadow) {\n var shadowStr = shadow.trim(),\n offsetsAndBlur = fabric.Shadow.reOffsetsAndBlur.exec(shadowStr) || [],\n color = shadowStr.replace(fabric.Shadow.reOffsetsAndBlur, '') || 'rgb(0,0,0)';\n return {\n color: color.trim(),\n offsetX: parseInt(offsetsAndBlur[1], 10) || 0,\n offsetY: parseInt(offsetsAndBlur[2], 10) || 0,\n blur: parseInt(offsetsAndBlur[3], 10) || 0\n };\n },\n\n /**\n * Returns a string representation of an instance\n * @see http://www.w3.org/TR/css-text-decor-3/#text-shadow\n * @return {String} Returns CSS3 text-shadow declaration\n */\n toString: function () {\n return [this.offsetX, this.offsetY, this.blur, this.color].join('px ');\n },\n\n /* _TO_SVG_START_ */\n\n /**\n * Returns SVG representation of a shadow\n * @param {fabric.Object} object\n * @return {String} SVG representation of a shadow\n */\n toSVG: function (object) {\n var fBoxX = 40,\n fBoxY = 40,\n NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS,\n offset = fabric.util.rotateVector({\n x: this.offsetX,\n y: this.offsetY\n }, fabric.util.degreesToRadians(-object.angle)),\n BLUR_BOX = 20,\n color = new fabric.Color(this.color);\n\n if (object.width && object.height) {\n //http://www.w3.org/TR/SVG/filters.html#FilterEffectsRegion\n // we add some extra space to filter box to contain the blur ( 20 )\n fBoxX = toFixed((Math.abs(offset.x) + this.blur) / object.width, NUM_FRACTION_DIGITS) * 100 + BLUR_BOX;\n fBoxY = toFixed((Math.abs(offset.y) + this.blur) / object.height, NUM_FRACTION_DIGITS) * 100 + BLUR_BOX;\n }\n\n if (object.flipX) {\n offset.x *= -1;\n }\n\n if (object.flipY) {\n offset.y *= -1;\n }\n\n return '<filter id=\"SVGID_' + this.id + '\" y=\"-' + fBoxY + '%\" height=\"' + (100 + 2 * fBoxY) + '%\" ' + 'x=\"-' + fBoxX + '%\" width=\"' + (100 + 2 * fBoxX) + '%\" ' + '>\\n' + '\\t<feGaussianBlur in=\"SourceAlpha\" stdDeviation=\"' + toFixed(this.blur ? this.blur / 2 : 0, NUM_FRACTION_DIGITS) + '\"></feGaussianBlur>\\n' + '\\t<feOffset dx=\"' + toFixed(offset.x, NUM_FRACTION_DIGITS) + '\" dy=\"' + toFixed(offset.y, NUM_FRACTION_DIGITS) + '\" result=\"oBlur\" ></feOffset>\\n' + '\\t<feFlood flood-color=\"' + color.toRgb() + '\" flood-opacity=\"' + color.getAlpha() + '\"/>\\n' + '\\t<feComposite in2=\"oBlur\" operator=\"in\" />\\n' + '\\t<feMerge>\\n' + '\\t\\t<feMergeNode></feMergeNode>\\n' + '\\t\\t<feMergeNode in=\"SourceGraphic\"></feMergeNode>\\n' + '\\t</feMerge>\\n' + '</filter>\\n';\n },\n\n /* _TO_SVG_END_ */\n\n /**\n * Returns object representation of a shadow\n * @return {Object} Object representation of a shadow instance\n */\n toObject: function () {\n if (this.includeDefaultValues) {\n return {\n color: this.color,\n blur: this.blur,\n offsetX: this.offsetX,\n offsetY: this.offsetY,\n affectStroke: this.affectStroke,\n nonScaling: this.nonScaling\n };\n }\n\n var obj = {},\n proto = fabric.Shadow.prototype;\n ['color', 'blur', 'offsetX', 'offsetY', 'affectStroke', 'nonScaling'].forEach(function (prop) {\n if (this[prop] !== proto[prop]) {\n obj[prop] = this[prop];\n }\n }, this);\n return obj;\n }\n });\n /**\n * Regex matching shadow offsetX, offsetY and blur (ex: \"2px 2px 10px rgba(0,0,0,0.2)\", \"rgb(0,255,0) 2px 2px\")\n * @static\n * @field\n * @memberOf fabric.Shadow\n */\n // eslint-disable-next-line max-len\n\n fabric.Shadow.reOffsetsAndBlur = /(?:\\s|^)(-?\\d+(?:px)?(?:\\s?|$))?(-?\\d+(?:px)?(?:\\s?|$))?(\\d+(?:px)?)?(?:\\s?|$)(?:$|\\s)/;\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function () {\n 'use strict';\n\n if (fabric.StaticCanvas) {\n fabric.warn('fabric.StaticCanvas is already defined.');\n return;\n } // aliases for faster resolution\n\n\n var extend = fabric.util.object.extend,\n getElementOffset = fabric.util.getElementOffset,\n removeFromArray = fabric.util.removeFromArray,\n toFixed = fabric.util.toFixed,\n transformPoint = fabric.util.transformPoint,\n invertTransform = fabric.util.invertTransform,\n getNodeCanvas = fabric.util.getNodeCanvas,\n createCanvasElement = fabric.util.createCanvasElement,\n CANVAS_INIT_ERROR = new Error('Could not initialize `canvas` element');\n /**\n * Static canvas class\n * @class fabric.StaticCanvas\n * @mixes fabric.Collection\n * @mixes fabric.Observable\n * @see {@link http://fabricjs.com/static_canvas|StaticCanvas demo}\n * @see {@link fabric.StaticCanvas#initialize} for constructor definition\n * @fires before:render\n * @fires after:render\n * @fires canvas:cleared\n * @fires object:added\n * @fires object:removed\n */\n\n fabric.StaticCanvas = fabric.util.createClass(fabric.CommonMethods,\n /** @lends fabric.StaticCanvas.prototype */\n {\n /**\n * Constructor\n * @param {HTMLElement | String} el <canvas> element to initialize instance on\n * @param {Object} [options] Options object\n * @return {Object} thisArg\n */\n initialize: function (el, options) {\n options || (options = {});\n this.renderAndResetBound = this.renderAndReset.bind(this);\n this.requestRenderAllBound = this.requestRenderAll.bind(this);\n\n this._initStatic(el, options);\n },\n\n /**\n * Background color of canvas instance.\n * Should be set via {@link fabric.StaticCanvas#setBackgroundColor}.\n * @type {(String|fabric.Pattern)}\n * @default\n */\n backgroundColor: '',\n\n /**\n * Background image of canvas instance.\n * since 2.4.0 image caching is active, please when putting an image as background, add to the\n * canvas property a reference to the canvas it is on. Otherwise the image cannot detect the zoom\n * vale. As an alternative you can disable image objectCaching\n * @type fabric.Image\n * @default\n */\n backgroundImage: null,\n\n /**\n * Overlay color of canvas instance.\n * Should be set via {@link fabric.StaticCanvas#setOverlayColor}\n * @since 1.3.9\n * @type {(String|fabric.Pattern)}\n * @default\n */\n overlayColor: '',\n\n /**\n * Overlay image of canvas instance.\n * since 2.4.0 image caching is active, please when putting an image as overlay, add to the\n * canvas property a reference to the canvas it is on. Otherwise the image cannot detect the zoom\n * vale. As an alternative you can disable image objectCaching\n * @type fabric.Image\n * @default\n */\n overlayImage: null,\n\n /**\n * Indicates whether toObject/toDatalessObject should include default values\n * if set to false, takes precedence over the object value.\n * @type Boolean\n * @default\n */\n includeDefaultValues: true,\n\n /**\n * Indicates whether objects' state should be saved\n * @type Boolean\n * @default\n */\n stateful: false,\n\n /**\n * Indicates whether {@link fabric.Collection.add}, {@link fabric.Collection.insertAt} and {@link fabric.Collection.remove},\n * {@link fabric.StaticCanvas.moveTo}, {@link fabric.StaticCanvas.clear} and many more, should also re-render canvas.\n * Disabling this option will not give a performance boost when adding/removing a lot of objects to/from canvas at once\n * since the renders are quequed and executed one per frame.\n * Disabling is suggested anyway and managing the renders of the app manually is not a big effort ( canvas.requestRenderAll() )\n * Left default to true to do not break documentation and old app, fiddles.\n * @type Boolean\n * @default\n */\n renderOnAddRemove: true,\n\n /**\n * Indicates whether object controls (borders/controls) are rendered above overlay image\n * @type Boolean\n * @default\n */\n controlsAboveOverlay: false,\n\n /**\n * Indicates whether the browser can be scrolled when using a touchscreen and dragging on the canvas\n * @type Boolean\n * @default\n */\n allowTouchScrolling: false,\n\n /**\n * Indicates whether this canvas will use image smoothing, this is on by default in browsers\n * @type Boolean\n * @default\n */\n imageSmoothingEnabled: true,\n\n /**\n * The transformation (in the format of Canvas transform) which focuses the viewport\n * @type Array\n * @default\n */\n viewportTransform: fabric.iMatrix.concat(),\n\n /**\n * if set to false background image is not affected by viewport transform\n * @since 1.6.3\n * @type Boolean\n * @default\n */\n backgroundVpt: true,\n\n /**\n * if set to false overlya image is not affected by viewport transform\n * @since 1.6.3\n * @type Boolean\n * @default\n */\n overlayVpt: true,\n\n /**\n * When true, canvas is scaled by devicePixelRatio for better rendering on retina screens\n * @type Boolean\n * @default\n */\n enableRetinaScaling: true,\n\n /**\n * Describe canvas element extension over design\n * properties are tl,tr,bl,br.\n * if canvas is not zoomed/panned those points are the four corner of canvas\n * if canvas is viewportTransformed you those points indicate the extension\n * of canvas element in plain untrasformed coordinates\n * The coordinates get updated with @method calcViewportBoundaries.\n * @memberOf fabric.StaticCanvas.prototype\n */\n vptCoords: {},\n\n /**\n * Based on vptCoords and object.aCoords, skip rendering of objects that\n * are not included in current viewport.\n * May greatly help in applications with crowded canvas and use of zoom/pan\n * If One of the corner of the bounding box of the object is on the canvas\n * the objects get rendered.\n * @memberOf fabric.StaticCanvas.prototype\n * @type Boolean\n * @default\n */\n skipOffscreen: true,\n\n /**\n * a fabricObject that, without stroke define a clipping area with their shape. filled in black\n * the clipPath object gets used when the canvas has rendered, and the context is placed in the\n * top left corner of the canvas.\n * clipPath will clip away controls, if you do not want this to happen use controlsAboveOverlay = true\n * @type fabric.Object\n */\n clipPath: undefined,\n\n /**\n * @private\n * @param {HTMLElement | String} el <canvas> element to initialize instance on\n * @param {Object} [options] Options object\n */\n _initStatic: function (el, options) {\n var cb = this.requestRenderAllBound;\n this._objects = [];\n\n this._createLowerCanvas(el);\n\n this._initOptions(options); // only initialize retina scaling once\n\n\n if (!this.interactive) {\n this._initRetinaScaling();\n }\n\n if (options.overlayImage) {\n this.setOverlayImage(options.overlayImage, cb);\n }\n\n if (options.backgroundImage) {\n this.setBackgroundImage(options.backgroundImage, cb);\n }\n\n if (options.backgroundColor) {\n this.setBackgroundColor(options.backgroundColor, cb);\n }\n\n if (options.overlayColor) {\n this.setOverlayColor(options.overlayColor, cb);\n }\n\n this.calcOffset();\n },\n\n /**\n * @private\n */\n _isRetinaScaling: function () {\n return fabric.devicePixelRatio !== 1 && this.enableRetinaScaling;\n },\n\n /**\n * @private\n * @return {Number} retinaScaling if applied, otherwise 1;\n */\n getRetinaScaling: function () {\n return this._isRetinaScaling() ? fabric.devicePixelRatio : 1;\n },\n\n /**\n * @private\n */\n _initRetinaScaling: function () {\n if (!this._isRetinaScaling()) {\n return;\n }\n\n var scaleRatio = fabric.devicePixelRatio;\n\n this.__initRetinaScaling(scaleRatio, this.lowerCanvasEl, this.contextContainer);\n\n if (this.upperCanvasEl) {\n this.__initRetinaScaling(scaleRatio, this.upperCanvasEl, this.contextTop);\n }\n },\n __initRetinaScaling: function (scaleRatio, canvas, context) {\n canvas.setAttribute('width', this.width * scaleRatio);\n canvas.setAttribute('height', this.height * scaleRatio);\n context.scale(scaleRatio, scaleRatio);\n },\n\n /**\n * Calculates canvas element offset relative to the document\n * This method is also attached as \"resize\" event handler of window\n * @return {fabric.Canvas} instance\n * @chainable\n */\n calcOffset: function () {\n this._offset = getElementOffset(this.lowerCanvasEl);\n return this;\n },\n\n /**\n * Sets {@link fabric.StaticCanvas#overlayImage|overlay image} for this canvas\n * @param {(fabric.Image|String)} image fabric.Image instance or URL of an image to set overlay to\n * @param {Function} callback callback to invoke when image is loaded and set as an overlay\n * @param {Object} [options] Optional options to set for the {@link fabric.Image|overlay image}.\n * @return {fabric.Canvas} thisArg\n * @chainable\n * @see {@link http://jsfiddle.net/fabricjs/MnzHT/|jsFiddle demo}\n * @example <caption>Normal overlayImage with left/top = 0</caption>\n * canvas.setOverlayImage('http://fabricjs.com/assets/jail_cell_bars.png', canvas.renderAll.bind(canvas), {\n * // Needed to position overlayImage at 0/0\n * originX: 'left',\n * originY: 'top'\n * });\n * @example <caption>overlayImage with different properties</caption>\n * canvas.setOverlayImage('http://fabricjs.com/assets/jail_cell_bars.png', canvas.renderAll.bind(canvas), {\n * opacity: 0.5,\n * angle: 45,\n * left: 400,\n * top: 400,\n * originX: 'left',\n * originY: 'top'\n * });\n * @example <caption>Stretched overlayImage #1 - width/height correspond to canvas width/height</caption>\n * fabric.Image.fromURL('http://fabricjs.com/assets/jail_cell_bars.png', function(img, isError) {\n * img.set({width: canvas.width, height: canvas.height, originX: 'left', originY: 'top'});\n * canvas.setOverlayImage(img, canvas.renderAll.bind(canvas));\n * });\n * @example <caption>Stretched overlayImage #2 - width/height correspond to canvas width/height</caption>\n * canvas.setOverlayImage('http://fabricjs.com/assets/jail_cell_bars.png', canvas.renderAll.bind(canvas), {\n * width: canvas.width,\n * height: canvas.height,\n * // Needed to position overlayImage at 0/0\n * originX: 'left',\n * originY: 'top'\n * });\n * @example <caption>overlayImage loaded from cross-origin</caption>\n * canvas.setOverlayImage('http://fabricjs.com/assets/jail_cell_bars.png', canvas.renderAll.bind(canvas), {\n * opacity: 0.5,\n * angle: 45,\n * left: 400,\n * top: 400,\n * originX: 'left',\n * originY: 'top',\n * crossOrigin: 'anonymous'\n * });\n */\n setOverlayImage: function (image, callback, options) {\n return this.__setBgOverlayImage('overlayImage', image, callback, options);\n },\n\n /**\n * Sets {@link fabric.StaticCanvas#backgroundImage|background image} for this canvas\n * @param {(fabric.Image|String)} image fabric.Image instance or URL of an image to set background to\n * @param {Function} callback Callback to invoke when image is loaded and set as background\n * @param {Object} [options] Optional options to set for the {@link fabric.Image|background image}.\n * @return {fabric.Canvas} thisArg\n * @chainable\n * @see {@link http://jsfiddle.net/djnr8o7a/28/|jsFiddle demo}\n * @example <caption>Normal backgroundImage with left/top = 0</caption>\n * canvas.setBackgroundImage('http://fabricjs.com/assets/honey_im_subtle.png', canvas.renderAll.bind(canvas), {\n * // Needed to position backgroundImage at 0/0\n * originX: 'left',\n * originY: 'top'\n * });\n * @example <caption>backgroundImage with different properties</caption>\n * canvas.setBackgroundImage('http://fabricjs.com/assets/honey_im_subtle.png', canvas.renderAll.bind(canvas), {\n * opacity: 0.5,\n * angle: 45,\n * left: 400,\n * top: 400,\n * originX: 'left',\n * originY: 'top'\n * });\n * @example <caption>Stretched backgroundImage #1 - width/height correspond to canvas width/height</caption>\n * fabric.Image.fromURL('http://fabricjs.com/assets/honey_im_subtle.png', function(img, isError) {\n * img.set({width: canvas.width, height: canvas.height, originX: 'left', originY: 'top'});\n * canvas.setBackgroundImage(img, canvas.renderAll.bind(canvas));\n * });\n * @example <caption>Stretched backgroundImage #2 - width/height correspond to canvas width/height</caption>\n * canvas.setBackgroundImage('http://fabricjs.com/assets/honey_im_subtle.png', canvas.renderAll.bind(canvas), {\n * width: canvas.width,\n * height: canvas.height,\n * // Needed to position backgroundImage at 0/0\n * originX: 'left',\n * originY: 'top'\n * });\n * @example <caption>backgroundImage loaded from cross-origin</caption>\n * canvas.setBackgroundImage('http://fabricjs.com/assets/honey_im_subtle.png', canvas.renderAll.bind(canvas), {\n * opacity: 0.5,\n * angle: 45,\n * left: 400,\n * top: 400,\n * originX: 'left',\n * originY: 'top',\n * crossOrigin: 'anonymous'\n * });\n */\n // TODO: fix stretched examples\n setBackgroundImage: function (image, callback, options) {\n return this.__setBgOverlayImage('backgroundImage', image, callback, options);\n },\n\n /**\n * Sets {@link fabric.StaticCanvas#overlayColor|foreground color} for this canvas\n * @param {(String|fabric.Pattern)} overlayColor Color or pattern to set foreground color to\n * @param {Function} callback Callback to invoke when foreground color is set\n * @return {fabric.Canvas} thisArg\n * @chainable\n * @see {@link http://jsfiddle.net/fabricjs/pB55h/|jsFiddle demo}\n * @example <caption>Normal overlayColor - color value</caption>\n * canvas.setOverlayColor('rgba(255, 73, 64, 0.6)', canvas.renderAll.bind(canvas));\n * @example <caption>fabric.Pattern used as overlayColor</caption>\n * canvas.setOverlayColor({\n * source: 'http://fabricjs.com/assets/escheresque_ste.png'\n * }, canvas.renderAll.bind(canvas));\n * @example <caption>fabric.Pattern used as overlayColor with repeat and offset</caption>\n * canvas.setOverlayColor({\n * source: 'http://fabricjs.com/assets/escheresque_ste.png',\n * repeat: 'repeat',\n * offsetX: 200,\n * offsetY: 100\n * }, canvas.renderAll.bind(canvas));\n */\n setOverlayColor: function (overlayColor, callback) {\n return this.__setBgOverlayColor('overlayColor', overlayColor, callback);\n },\n\n /**\n * Sets {@link fabric.StaticCanvas#backgroundColor|background color} for this canvas\n * @param {(String|fabric.Pattern)} backgroundColor Color or pattern to set background color to\n * @param {Function} callback Callback to invoke when background color is set\n * @return {fabric.Canvas} thisArg\n * @chainable\n * @see {@link http://jsfiddle.net/fabricjs/hXzvk/|jsFiddle demo}\n * @example <caption>Normal backgroundColor - color value</caption>\n * canvas.setBackgroundColor('rgba(255, 73, 64, 0.6)', canvas.renderAll.bind(canvas));\n * @example <caption>fabric.Pattern used as backgroundColor</caption>\n * canvas.setBackgroundColor({\n * source: 'http://fabricjs.com/assets/escheresque_ste.png'\n * }, canvas.renderAll.bind(canvas));\n * @example <caption>fabric.Pattern used as backgroundColor with repeat and offset</caption>\n * canvas.setBackgroundColor({\n * source: 'http://fabricjs.com/assets/escheresque_ste.png',\n * repeat: 'repeat',\n * offsetX: 200,\n * offsetY: 100\n * }, canvas.renderAll.bind(canvas));\n */\n setBackgroundColor: function (backgroundColor, callback) {\n return this.__setBgOverlayColor('backgroundColor', backgroundColor, callback);\n },\n\n /**\n * @private\n * @param {String} property Property to set ({@link fabric.StaticCanvas#backgroundImage|backgroundImage}\n * or {@link fabric.StaticCanvas#overlayImage|overlayImage})\n * @param {(fabric.Image|String|null)} image fabric.Image instance, URL of an image or null to set background or overlay to\n * @param {Function} callback Callback to invoke when image is loaded and set as background or overlay. The first argument is the created image, the second argument is a flag indicating whether an error occured or not.\n * @param {Object} [options] Optional options to set for the {@link fabric.Image|image}.\n */\n __setBgOverlayImage: function (property, image, callback, options) {\n if (typeof image === 'string') {\n fabric.util.loadImage(image, function (img, isError) {\n if (img) {\n var instance = new fabric.Image(img, options);\n this[property] = instance;\n instance.canvas = this;\n }\n\n callback && callback(img, isError);\n }, this, options && options.crossOrigin);\n } else {\n options && image.setOptions(options);\n this[property] = image;\n image && (image.canvas = this);\n callback && callback(image, false);\n }\n\n return this;\n },\n\n /**\n * @private\n * @param {String} property Property to set ({@link fabric.StaticCanvas#backgroundColor|backgroundColor}\n * or {@link fabric.StaticCanvas#overlayColor|overlayColor})\n * @param {(Object|String|null)} color Object with pattern information, color value or null\n * @param {Function} [callback] Callback is invoked when color is set\n */\n __setBgOverlayColor: function (property, color, callback) {\n this[property] = color;\n\n this._initGradient(color, property);\n\n this._initPattern(color, property, callback);\n\n return this;\n },\n\n /**\n * @private\n */\n _createCanvasElement: function () {\n var element = createCanvasElement();\n\n if (!element) {\n throw CANVAS_INIT_ERROR;\n }\n\n if (!element.style) {\n element.style = {};\n }\n\n if (typeof element.getContext === 'undefined') {\n throw CANVAS_INIT_ERROR;\n }\n\n return element;\n },\n\n /**\n * @private\n * @param {Object} [options] Options object\n */\n _initOptions: function (options) {\n var lowerCanvasEl = this.lowerCanvasEl;\n\n this._setOptions(options);\n\n this.width = this.width || parseInt(lowerCanvasEl.width, 10) || 0;\n this.height = this.height || parseInt(lowerCanvasEl.height, 10) || 0;\n\n if (!this.lowerCanvasEl.style) {\n return;\n }\n\n lowerCanvasEl.width = this.width;\n lowerCanvasEl.height = this.height;\n lowerCanvasEl.style.width = this.width + 'px';\n lowerCanvasEl.style.height = this.height + 'px';\n this.viewportTransform = this.viewportTransform.slice();\n },\n\n /**\n * Creates a bottom canvas\n * @private\n * @param {HTMLElement} [canvasEl]\n */\n _createLowerCanvas: function (canvasEl) {\n // canvasEl === 'HTMLCanvasElement' does not work on jsdom/node\n if (canvasEl && canvasEl.getContext) {\n this.lowerCanvasEl = canvasEl;\n } else {\n this.lowerCanvasEl = fabric.util.getById(canvasEl) || this._createCanvasElement();\n }\n\n fabric.util.addClass(this.lowerCanvasEl, 'lower-canvas');\n\n if (this.interactive) {\n this._applyCanvasStyle(this.lowerCanvasEl);\n }\n\n this.contextContainer = this.lowerCanvasEl.getContext('2d');\n },\n\n /**\n * Returns canvas width (in px)\n * @return {Number}\n */\n getWidth: function () {\n return this.width;\n },\n\n /**\n * Returns canvas height (in px)\n * @return {Number}\n */\n getHeight: function () {\n return this.height;\n },\n\n /**\n * Sets width of this canvas instance\n * @param {Number|String} value Value to set width to\n * @param {Object} [options] Options object\n * @param {Boolean} [options.backstoreOnly=false] Set the given dimensions only as canvas backstore dimensions\n * @param {Boolean} [options.cssOnly=false] Set the given dimensions only as css dimensions\n * @return {fabric.Canvas} instance\n * @chainable true\n */\n setWidth: function (value, options) {\n return this.setDimensions({\n width: value\n }, options);\n },\n\n /**\n * Sets height of this canvas instance\n * @param {Number|String} value Value to set height to\n * @param {Object} [options] Options object\n * @param {Boolean} [options.backstoreOnly=false] Set the given dimensions only as canvas backstore dimensions\n * @param {Boolean} [options.cssOnly=false] Set the given dimensions only as css dimensions\n * @return {fabric.Canvas} instance\n * @chainable true\n */\n setHeight: function (value, options) {\n return this.setDimensions({\n height: value\n }, options);\n },\n\n /**\n * Sets dimensions (width, height) of this canvas instance. when options.cssOnly flag active you should also supply the unit of measure (px/%/em)\n * @param {Object} dimensions Object with width/height properties\n * @param {Number|String} [dimensions.width] Width of canvas element\n * @param {Number|String} [dimensions.height] Height of canvas element\n * @param {Object} [options] Options object\n * @param {Boolean} [options.backstoreOnly=false] Set the given dimensions only as canvas backstore dimensions\n * @param {Boolean} [options.cssOnly=false] Set the given dimensions only as css dimensions\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n setDimensions: function (dimensions, options) {\n var cssValue;\n options = options || {};\n\n for (var prop in dimensions) {\n cssValue = dimensions[prop];\n\n if (!options.cssOnly) {\n this._setBackstoreDimension(prop, dimensions[prop]);\n\n cssValue += 'px';\n this.hasLostContext = true;\n }\n\n if (!options.backstoreOnly) {\n this._setCssDimension(prop, cssValue);\n }\n }\n\n if (this._isCurrentlyDrawing) {\n this.freeDrawingBrush && this.freeDrawingBrush._setBrushStyles();\n }\n\n this._initRetinaScaling();\n\n this.calcOffset();\n\n if (!options.cssOnly) {\n this.requestRenderAll();\n }\n\n return this;\n },\n\n /**\n * Helper for setting width/height\n * @private\n * @param {String} prop property (width|height)\n * @param {Number} value value to set property to\n * @return {fabric.Canvas} instance\n * @chainable true\n */\n _setBackstoreDimension: function (prop, value) {\n this.lowerCanvasEl[prop] = value;\n\n if (this.upperCanvasEl) {\n this.upperCanvasEl[prop] = value;\n }\n\n if (this.cacheCanvasEl) {\n this.cacheCanvasEl[prop] = value;\n }\n\n this[prop] = value;\n return this;\n },\n\n /**\n * Helper for setting css width/height\n * @private\n * @param {String} prop property (width|height)\n * @param {String} value value to set property to\n * @return {fabric.Canvas} instance\n * @chainable true\n */\n _setCssDimension: function (prop, value) {\n this.lowerCanvasEl.style[prop] = value;\n\n if (this.upperCanvasEl) {\n this.upperCanvasEl.style[prop] = value;\n }\n\n if (this.wrapperEl) {\n this.wrapperEl.style[prop] = value;\n }\n\n return this;\n },\n\n /**\n * Returns canvas zoom level\n * @return {Number}\n */\n getZoom: function () {\n return this.viewportTransform[0];\n },\n\n /**\n * Sets viewport transform of this canvas instance\n * @param {Array} vpt the transform in the form of context.transform\n * @return {fabric.Canvas} instance\n * @chainable true\n */\n setViewportTransform: function (vpt) {\n var activeObject = this._activeObject,\n object,\n i,\n len;\n this.viewportTransform = vpt;\n\n for (i = 0, len = this._objects.length; i < len; i++) {\n object = this._objects[i];\n object.group || object.setCoords(true);\n }\n\n if (activeObject) {\n activeObject.setCoords();\n }\n\n this.calcViewportBoundaries();\n this.renderOnAddRemove && this.requestRenderAll();\n return this;\n },\n\n /**\n * Sets zoom level of this canvas instance, zoom centered around point\n * @param {fabric.Point} point to zoom with respect to\n * @param {Number} value to set zoom to, less than 1 zooms out\n * @return {fabric.Canvas} instance\n * @chainable true\n */\n zoomToPoint: function (point, value) {\n // TODO: just change the scale, preserve other transformations\n var before = point,\n vpt = this.viewportTransform.slice(0);\n point = transformPoint(point, invertTransform(this.viewportTransform));\n vpt[0] = value;\n vpt[3] = value;\n var after = transformPoint(point, vpt);\n vpt[4] += before.x - after.x;\n vpt[5] += before.y - after.y;\n return this.setViewportTransform(vpt);\n },\n\n /**\n * Sets zoom level of this canvas instance\n * @param {Number} value to set zoom to, less than 1 zooms out\n * @return {fabric.Canvas} instance\n * @chainable true\n */\n setZoom: function (value) {\n this.zoomToPoint(new fabric.Point(0, 0), value);\n return this;\n },\n\n /**\n * Pan viewport so as to place point at top left corner of canvas\n * @param {fabric.Point} point to move to\n * @return {fabric.Canvas} instance\n * @chainable true\n */\n absolutePan: function (point) {\n var vpt = this.viewportTransform.slice(0);\n vpt[4] = -point.x;\n vpt[5] = -point.y;\n return this.setViewportTransform(vpt);\n },\n\n /**\n * Pans viewpoint relatively\n * @param {fabric.Point} point (position vector) to move by\n * @return {fabric.Canvas} instance\n * @chainable true\n */\n relativePan: function (point) {\n return this.absolutePan(new fabric.Point(-point.x - this.viewportTransform[4], -point.y - this.viewportTransform[5]));\n },\n\n /**\n * Returns <canvas> element corresponding to this instance\n * @return {HTMLCanvasElement}\n */\n getElement: function () {\n return this.lowerCanvasEl;\n },\n\n /**\n * @private\n * @param {fabric.Object} obj Object that was added\n */\n _onObjectAdded: function (obj) {\n this.stateful && obj.setupState();\n\n obj._set('canvas', this);\n\n obj.setCoords();\n this.fire('object:added', {\n target: obj\n });\n obj.fire('added');\n },\n\n /**\n * @private\n * @param {fabric.Object} obj Object that was removed\n */\n _onObjectRemoved: function (obj) {\n this.fire('object:removed', {\n target: obj\n });\n obj.fire('removed');\n delete obj.canvas;\n },\n\n /**\n * Clears specified context of canvas element\n * @param {CanvasRenderingContext2D} ctx Context to clear\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n clearContext: function (ctx) {\n ctx.clearRect(0, 0, this.width, this.height);\n return this;\n },\n\n /**\n * Returns context of canvas where objects are drawn\n * @return {CanvasRenderingContext2D}\n */\n getContext: function () {\n return this.contextContainer;\n },\n\n /**\n * Clears all contexts (background, main, top) of an instance\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n clear: function () {\n this._objects.length = 0;\n this.backgroundImage = null;\n this.overlayImage = null;\n this.backgroundColor = '';\n this.overlayColor = '';\n\n if (this._hasITextHandlers) {\n this.off('mouse:up', this._mouseUpITextHandler);\n this._iTextInstances = null;\n this._hasITextHandlers = false;\n }\n\n this.clearContext(this.contextContainer);\n this.fire('canvas:cleared');\n this.renderOnAddRemove && this.requestRenderAll();\n return this;\n },\n\n /**\n * Renders the canvas\n * @return {fabric.Canvas} instance\n * @chainable\n */\n renderAll: function () {\n var canvasToDrawOn = this.contextContainer;\n this.renderCanvas(canvasToDrawOn, this._objects);\n return this;\n },\n\n /**\n * Function created to be instance bound at initialization\n * used in requestAnimationFrame rendering\n * Let the fabricJS call it. If you call it manually you could have more\n * animationFrame stacking on to of each other\n * for an imperative rendering, use canvas.renderAll\n * @private\n * @return {fabric.Canvas} instance\n * @chainable\n */\n renderAndReset: function () {\n this.isRendering = 0;\n this.renderAll();\n },\n\n /**\n * Append a renderAll request to next animation frame.\n * unless one is already in progress, in that case nothing is done\n * a boolean flag will avoid appending more.\n * @return {fabric.Canvas} instance\n * @chainable\n */\n requestRenderAll: function () {\n if (!this.isRendering) {\n this.isRendering = fabric.util.requestAnimFrame(this.renderAndResetBound);\n }\n\n return this;\n },\n\n /**\n * Calculate the position of the 4 corner of canvas with current viewportTransform.\n * helps to determinate when an object is in the current rendering viewport using\n * object absolute coordinates ( aCoords )\n * @return {Object} points.tl\n * @chainable\n */\n calcViewportBoundaries: function () {\n var points = {},\n width = this.width,\n height = this.height,\n iVpt = invertTransform(this.viewportTransform);\n points.tl = transformPoint({\n x: 0,\n y: 0\n }, iVpt);\n points.br = transformPoint({\n x: width,\n y: height\n }, iVpt);\n points.tr = new fabric.Point(points.br.x, points.tl.y);\n points.bl = new fabric.Point(points.tl.x, points.br.y);\n this.vptCoords = points;\n return points;\n },\n cancelRequestedRender: function () {\n if (this.isRendering) {\n fabric.util.cancelAnimFrame(this.isRendering);\n this.isRendering = 0;\n }\n },\n\n /**\n * Renders background, objects, overlay and controls.\n * @param {CanvasRenderingContext2D} ctx\n * @param {Array} objects to render\n * @return {fabric.Canvas} instance\n * @chainable\n */\n renderCanvas: function (ctx, objects) {\n var v = this.viewportTransform,\n path = this.clipPath;\n this.cancelRequestedRender();\n this.calcViewportBoundaries();\n this.clearContext(ctx);\n fabric.util.setImageSmoothing(ctx, this.imageSmoothingEnabled);\n this.fire('before:render', {\n ctx: ctx\n });\n\n this._renderBackground(ctx);\n\n ctx.save(); //apply viewport transform once for all rendering process\n\n ctx.transform(v[0], v[1], v[2], v[3], v[4], v[5]);\n\n this._renderObjects(ctx, objects);\n\n ctx.restore();\n\n if (!this.controlsAboveOverlay && this.interactive) {\n this.drawControls(ctx);\n }\n\n if (path) {\n path.canvas = this; // needed to setup a couple of variables\n\n path.shouldCache();\n path._transformDone = true;\n path.renderCache({\n forClipping: true\n });\n this.drawClipPathOnCanvas(ctx);\n }\n\n this._renderOverlay(ctx);\n\n if (this.controlsAboveOverlay && this.interactive) {\n this.drawControls(ctx);\n }\n\n this.fire('after:render', {\n ctx: ctx\n });\n },\n\n /**\n * Paint the cached clipPath on the lowerCanvasEl\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n drawClipPathOnCanvas: function (ctx) {\n var v = this.viewportTransform,\n path = this.clipPath;\n ctx.save();\n ctx.transform(v[0], v[1], v[2], v[3], v[4], v[5]); // DEBUG: uncomment this line, comment the following\n // ctx.globalAlpha = 0.4;\n\n ctx.globalCompositeOperation = 'destination-in';\n path.transform(ctx);\n ctx.scale(1 / path.zoomX, 1 / path.zoomY);\n ctx.drawImage(path._cacheCanvas, -path.cacheTranslationX, -path.cacheTranslationY);\n ctx.restore();\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n * @param {Array} objects to render\n */\n _renderObjects: function (ctx, objects) {\n var i, len;\n\n for (i = 0, len = objects.length; i < len; ++i) {\n objects[i] && objects[i].render(ctx);\n }\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n * @param {string} property 'background' or 'overlay'\n */\n _renderBackgroundOrOverlay: function (ctx, property) {\n var fill = this[property + 'Color'],\n object = this[property + 'Image'],\n v = this.viewportTransform,\n needsVpt = this[property + 'Vpt'];\n\n if (!fill && !object) {\n return;\n }\n\n if (fill) {\n ctx.save();\n ctx.beginPath();\n ctx.moveTo(0, 0);\n ctx.lineTo(this.width, 0);\n ctx.lineTo(this.width, this.height);\n ctx.lineTo(0, this.height);\n ctx.closePath();\n ctx.fillStyle = fill.toLive ? fill.toLive(ctx, this) : fill;\n\n if (needsVpt) {\n ctx.transform(v[0], v[1], v[2], v[3], v[4], v[5]);\n }\n\n ctx.transform(1, 0, 0, 1, fill.offsetX || 0, fill.offsetY || 0);\n var m = fill.gradientTransform || fill.patternTransform;\n m && ctx.transform(m[0], m[1], m[2], m[3], m[4], m[5]);\n ctx.fill();\n ctx.restore();\n }\n\n if (object) {\n ctx.save();\n\n if (needsVpt) {\n ctx.transform(v[0], v[1], v[2], v[3], v[4], v[5]);\n }\n\n object.render(ctx);\n ctx.restore();\n }\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderBackground: function (ctx) {\n this._renderBackgroundOrOverlay(ctx, 'background');\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderOverlay: function (ctx) {\n this._renderBackgroundOrOverlay(ctx, 'overlay');\n },\n\n /**\n * Returns coordinates of a center of canvas.\n * Returned value is an object with top and left properties\n * @return {Object} object with \"top\" and \"left\" number values\n */\n getCenter: function () {\n return {\n top: this.height / 2,\n left: this.width / 2\n };\n },\n\n /**\n * Centers object horizontally in the canvas\n * @param {fabric.Object} object Object to center horizontally\n * @return {fabric.Canvas} thisArg\n */\n centerObjectH: function (object) {\n return this._centerObject(object, new fabric.Point(this.getCenter().left, object.getCenterPoint().y));\n },\n\n /**\n * Centers object vertically in the canvas\n * @param {fabric.Object} object Object to center vertically\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n centerObjectV: function (object) {\n return this._centerObject(object, new fabric.Point(object.getCenterPoint().x, this.getCenter().top));\n },\n\n /**\n * Centers object vertically and horizontally in the canvas\n * @param {fabric.Object} object Object to center vertically and horizontally\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n centerObject: function (object) {\n var center = this.getCenter();\n return this._centerObject(object, new fabric.Point(center.left, center.top));\n },\n\n /**\n * Centers object vertically and horizontally in the viewport\n * @param {fabric.Object} object Object to center vertically and horizontally\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n viewportCenterObject: function (object) {\n var vpCenter = this.getVpCenter();\n return this._centerObject(object, vpCenter);\n },\n\n /**\n * Centers object horizontally in the viewport, object.top is unchanged\n * @param {fabric.Object} object Object to center vertically and horizontally\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n viewportCenterObjectH: function (object) {\n var vpCenter = this.getVpCenter();\n\n this._centerObject(object, new fabric.Point(vpCenter.x, object.getCenterPoint().y));\n\n return this;\n },\n\n /**\n * Centers object Vertically in the viewport, object.top is unchanged\n * @param {fabric.Object} object Object to center vertically and horizontally\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n viewportCenterObjectV: function (object) {\n var vpCenter = this.getVpCenter();\n return this._centerObject(object, new fabric.Point(object.getCenterPoint().x, vpCenter.y));\n },\n\n /**\n * Calculate the point in canvas that correspond to the center of actual viewport.\n * @return {fabric.Point} vpCenter, viewport center\n * @chainable\n */\n getVpCenter: function () {\n var center = this.getCenter(),\n iVpt = invertTransform(this.viewportTransform);\n return transformPoint({\n x: center.left,\n y: center.top\n }, iVpt);\n },\n\n /**\n * @private\n * @param {fabric.Object} object Object to center\n * @param {fabric.Point} center Center point\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n _centerObject: function (object, center) {\n object.setPositionByOrigin(center, 'center', 'center');\n object.setCoords();\n this.renderOnAddRemove && this.requestRenderAll();\n return this;\n },\n\n /**\n * Returs dataless JSON representation of canvas\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {String} json string\n */\n toDatalessJSON: function (propertiesToInclude) {\n return this.toDatalessObject(propertiesToInclude);\n },\n\n /**\n * Returns object representation of canvas\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} object representation of an instance\n */\n toObject: function (propertiesToInclude) {\n return this._toObjectMethod('toObject', propertiesToInclude);\n },\n\n /**\n * Returns dataless object representation of canvas\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} object representation of an instance\n */\n toDatalessObject: function (propertiesToInclude) {\n return this._toObjectMethod('toDatalessObject', propertiesToInclude);\n },\n\n /**\n * @private\n */\n _toObjectMethod: function (methodName, propertiesToInclude) {\n var clipPath = this.clipPath,\n data = {\n version: fabric.version,\n objects: this._toObjects(methodName, propertiesToInclude)\n };\n\n if (clipPath) {\n data.clipPath = this._toObject(this.clipPath, methodName, propertiesToInclude);\n }\n\n extend(data, this.__serializeBgOverlay(methodName, propertiesToInclude));\n fabric.util.populateWithProperties(this, data, propertiesToInclude);\n return data;\n },\n\n /**\n * @private\n */\n _toObjects: function (methodName, propertiesToInclude) {\n return this._objects.filter(function (object) {\n return !object.excludeFromExport;\n }).map(function (instance) {\n return this._toObject(instance, methodName, propertiesToInclude);\n }, this);\n },\n\n /**\n * @private\n */\n _toObject: function (instance, methodName, propertiesToInclude) {\n var originalValue;\n\n if (!this.includeDefaultValues) {\n originalValue = instance.includeDefaultValues;\n instance.includeDefaultValues = false;\n }\n\n var object = instance[methodName](propertiesToInclude);\n\n if (!this.includeDefaultValues) {\n instance.includeDefaultValues = originalValue;\n }\n\n return object;\n },\n\n /**\n * @private\n */\n __serializeBgOverlay: function (methodName, propertiesToInclude) {\n var data = {},\n bgImage = this.backgroundImage,\n overlay = this.overlayImage;\n\n if (this.backgroundColor) {\n data.background = this.backgroundColor.toObject ? this.backgroundColor.toObject(propertiesToInclude) : this.backgroundColor;\n }\n\n if (this.overlayColor) {\n data.overlay = this.overlayColor.toObject ? this.overlayColor.toObject(propertiesToInclude) : this.overlayColor;\n }\n\n if (bgImage && !bgImage.excludeFromExport) {\n data.backgroundImage = this._toObject(bgImage, methodName, propertiesToInclude);\n }\n\n if (overlay && !overlay.excludeFromExport) {\n data.overlayImage = this._toObject(overlay, methodName, propertiesToInclude);\n }\n\n return data;\n },\n\n /* _TO_SVG_START_ */\n\n /**\n * When true, getSvgTransform() will apply the StaticCanvas.viewportTransform to the SVG transformation. When true,\n * a zoomed canvas will then produce zoomed SVG output.\n * @type Boolean\n * @default\n */\n svgViewportTransformation: true,\n\n /**\n * Returns SVG representation of canvas\n * @function\n * @param {Object} [options] Options object for SVG output\n * @param {Boolean} [options.suppressPreamble=false] If true xml tag is not included\n * @param {Object} [options.viewBox] SVG viewbox object\n * @param {Number} [options.viewBox.x] x-cooridnate of viewbox\n * @param {Number} [options.viewBox.y] y-coordinate of viewbox\n * @param {Number} [options.viewBox.width] Width of viewbox\n * @param {Number} [options.viewBox.height] Height of viewbox\n * @param {String} [options.encoding=UTF-8] Encoding of SVG output\n * @param {String} [options.width] desired width of svg with or without units\n * @param {String} [options.height] desired height of svg with or without units\n * @param {Function} [reviver] Method for further parsing of svg elements, called after each fabric object converted into svg representation.\n * @return {String} SVG string\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-3#serialization}\n * @see {@link http://jsfiddle.net/fabricjs/jQ3ZZ/|jsFiddle demo}\n * @example <caption>Normal SVG output</caption>\n * var svg = canvas.toSVG();\n * @example <caption>SVG output without preamble (without <?xml ../>)</caption>\n * var svg = canvas.toSVG({suppressPreamble: true});\n * @example <caption>SVG output with viewBox attribute</caption>\n * var svg = canvas.toSVG({\n * viewBox: {\n * x: 100,\n * y: 100,\n * width: 200,\n * height: 300\n * }\n * });\n * @example <caption>SVG output with different encoding (default: UTF-8)</caption>\n * var svg = canvas.toSVG({encoding: 'ISO-8859-1'});\n * @example <caption>Modify SVG output with reviver function</caption>\n * var svg = canvas.toSVG(null, function(svg) {\n * return svg.replace('stroke-dasharray: ; stroke-linecap: butt; stroke-linejoin: miter; stroke-miterlimit: 10; ', '');\n * });\n */\n toSVG: function (options, reviver) {\n options || (options = {});\n options.reviver = reviver;\n var markup = [];\n\n this._setSVGPreamble(markup, options);\n\n this._setSVGHeader(markup, options);\n\n if (this.clipPath) {\n markup.push('<g clip-path=\"url(#' + this.clipPath.clipPathId + ')\" >\\n');\n }\n\n this._setSVGBgOverlayColor(markup, 'background');\n\n this._setSVGBgOverlayImage(markup, 'backgroundImage', reviver);\n\n this._setSVGObjects(markup, reviver);\n\n if (this.clipPath) {\n markup.push('</g>\\n');\n }\n\n this._setSVGBgOverlayColor(markup, 'overlay');\n\n this._setSVGBgOverlayImage(markup, 'overlayImage', reviver);\n\n markup.push('</svg>');\n return markup.join('');\n },\n\n /**\n * @private\n */\n _setSVGPreamble: function (markup, options) {\n if (options.suppressPreamble) {\n return;\n }\n\n markup.push('<?xml version=\"1.0\" encoding=\"', options.encoding || 'UTF-8', '\" standalone=\"no\" ?>\\n', '<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\" ', '\"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\\n');\n },\n\n /**\n * @private\n */\n _setSVGHeader: function (markup, options) {\n var width = options.width || this.width,\n height = options.height || this.height,\n vpt,\n viewBox = 'viewBox=\"0 0 ' + this.width + ' ' + this.height + '\" ',\n NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS;\n\n if (options.viewBox) {\n viewBox = 'viewBox=\"' + options.viewBox.x + ' ' + options.viewBox.y + ' ' + options.viewBox.width + ' ' + options.viewBox.height + '\" ';\n } else {\n if (this.svgViewportTransformation) {\n vpt = this.viewportTransform;\n viewBox = 'viewBox=\"' + toFixed(-vpt[4] / vpt[0], NUM_FRACTION_DIGITS) + ' ' + toFixed(-vpt[5] / vpt[3], NUM_FRACTION_DIGITS) + ' ' + toFixed(this.width / vpt[0], NUM_FRACTION_DIGITS) + ' ' + toFixed(this.height / vpt[3], NUM_FRACTION_DIGITS) + '\" ';\n }\n }\n\n markup.push('<svg ', 'xmlns=\"http://www.w3.org/2000/svg\" ', 'xmlns:xlink=\"http://www.w3.org/1999/xlink\" ', 'version=\"1.1\" ', 'width=\"', width, '\" ', 'height=\"', height, '\" ', viewBox, 'xml:space=\"preserve\">\\n', '<desc>Created with Fabric.js ', fabric.version, '</desc>\\n', '<defs>\\n', this.createSVGFontFacesMarkup(), this.createSVGRefElementsMarkup(), this.createSVGClipPathMarkup(options), '</defs>\\n');\n },\n createSVGClipPathMarkup: function (options) {\n var clipPath = this.clipPath;\n\n if (clipPath) {\n clipPath.clipPathId = 'CLIPPATH_' + fabric.Object.__uid++;\n return '<clipPath id=\"' + clipPath.clipPathId + '\" >\\n' + this.clipPath.toClipPathSVG(options.reviver) + '</clipPath>\\n';\n }\n\n return '';\n },\n\n /**\n * Creates markup containing SVG referenced elements like patterns, gradients etc.\n * @return {String}\n */\n createSVGRefElementsMarkup: function () {\n var _this = this,\n markup = ['background', 'overlay'].map(function (prop) {\n var fill = _this[prop + 'Color'];\n\n if (fill && fill.toLive) {\n var shouldTransform = _this[prop + 'Vpt'],\n vpt = _this.viewportTransform,\n object = {\n width: _this.width / (shouldTransform ? vpt[0] : 1),\n height: _this.height / (shouldTransform ? vpt[3] : 1)\n };\n return fill.toSVG(object, {\n additionalTransform: shouldTransform ? fabric.util.matrixToSVG(vpt) : ''\n });\n }\n });\n\n return markup.join('');\n },\n\n /**\n * Creates markup containing SVG font faces,\n * font URLs for font faces must be collected by developers\n * and are not extracted from the DOM by fabricjs\n * @param {Array} objects Array of fabric objects\n * @return {String}\n */\n createSVGFontFacesMarkup: function () {\n var markup = '',\n fontList = {},\n obj,\n fontFamily,\n style,\n row,\n rowIndex,\n _char,\n charIndex,\n i,\n len,\n fontPaths = fabric.fontPaths,\n objects = [];\n\n this._objects.forEach(function add(object) {\n objects.push(object);\n\n if (object._objects) {\n object._objects.forEach(add);\n }\n });\n\n for (i = 0, len = objects.length; i < len; i++) {\n obj = objects[i];\n fontFamily = obj.fontFamily;\n\n if (obj.type.indexOf('text') === -1 || fontList[fontFamily] || !fontPaths[fontFamily]) {\n continue;\n }\n\n fontList[fontFamily] = true;\n\n if (!obj.styles) {\n continue;\n }\n\n style = obj.styles;\n\n for (rowIndex in style) {\n row = style[rowIndex];\n\n for (charIndex in row) {\n _char = row[charIndex];\n fontFamily = _char.fontFamily;\n\n if (!fontList[fontFamily] && fontPaths[fontFamily]) {\n fontList[fontFamily] = true;\n }\n }\n }\n }\n\n for (var j in fontList) {\n markup += ['\\t\\t@font-face {\\n', '\\t\\t\\tfont-family: \\'', j, '\\';\\n', '\\t\\t\\tsrc: url(\\'', fontPaths[j], '\\');\\n', '\\t\\t}\\n'].join('');\n }\n\n if (markup) {\n markup = ['\\t<style type=\"text/css\">', '<![CDATA[\\n', markup, ']]>', '</style>\\n'].join('');\n }\n\n return markup;\n },\n\n /**\n * @private\n */\n _setSVGObjects: function (markup, reviver) {\n var instance,\n i,\n len,\n objects = this._objects;\n\n for (i = 0, len = objects.length; i < len; i++) {\n instance = objects[i];\n\n if (instance.excludeFromExport) {\n continue;\n }\n\n this._setSVGObject(markup, instance, reviver);\n }\n },\n\n /**\n * @private\n */\n _setSVGObject: function (markup, instance, reviver) {\n markup.push(instance.toSVG(reviver));\n },\n\n /**\n * @private\n */\n _setSVGBgOverlayImage: function (markup, property, reviver) {\n if (this[property] && !this[property].excludeFromExport && this[property].toSVG) {\n markup.push(this[property].toSVG(reviver));\n }\n },\n\n /**\n * @private\n */\n _setSVGBgOverlayColor: function (markup, property) {\n var filler = this[property + 'Color'],\n vpt = this.viewportTransform,\n finalWidth = this.width,\n finalHeight = this.height;\n\n if (!filler) {\n return;\n }\n\n if (filler.toLive) {\n var repeat = filler.repeat,\n iVpt = fabric.util.invertTransform(vpt),\n shouldInvert = this[property + 'Vpt'],\n additionalTransform = shouldInvert ? fabric.util.matrixToSVG(iVpt) : '';\n markup.push('<rect transform=\"' + additionalTransform + ' translate(', finalWidth / 2, ',', finalHeight / 2, ')\"', ' x=\"', filler.offsetX - finalWidth / 2, '\" y=\"', filler.offsetY - finalHeight / 2, '\" ', 'width=\"', repeat === 'repeat-y' || repeat === 'no-repeat' ? filler.source.width : finalWidth, '\" height=\"', repeat === 'repeat-x' || repeat === 'no-repeat' ? filler.source.height : finalHeight, '\" fill=\"url(#SVGID_' + filler.id + ')\"', '></rect>\\n');\n } else {\n markup.push('<rect x=\"0\" y=\"0\" width=\"100%\" height=\"100%\" ', 'fill=\"', filler, '\"', '></rect>\\n');\n }\n },\n\n /* _TO_SVG_END_ */\n\n /**\n * Moves an object or the objects of a multiple selection\n * to the bottom of the stack of drawn objects\n * @param {fabric.Object} object Object to send to back\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n sendToBack: function (object) {\n if (!object) {\n return this;\n }\n\n var activeSelection = this._activeObject,\n i,\n obj,\n objs;\n\n if (object === activeSelection && object.type === 'activeSelection') {\n objs = activeSelection._objects;\n\n for (i = objs.length; i--;) {\n obj = objs[i];\n removeFromArray(this._objects, obj);\n\n this._objects.unshift(obj);\n }\n } else {\n removeFromArray(this._objects, object);\n\n this._objects.unshift(object);\n }\n\n this.renderOnAddRemove && this.requestRenderAll();\n return this;\n },\n\n /**\n * Moves an object or the objects of a multiple selection\n * to the top of the stack of drawn objects\n * @param {fabric.Object} object Object to send\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n bringToFront: function (object) {\n if (!object) {\n return this;\n }\n\n var activeSelection = this._activeObject,\n i,\n obj,\n objs;\n\n if (object === activeSelection && object.type === 'activeSelection') {\n objs = activeSelection._objects;\n\n for (i = 0; i < objs.length; i++) {\n obj = objs[i];\n removeFromArray(this._objects, obj);\n\n this._objects.push(obj);\n }\n } else {\n removeFromArray(this._objects, object);\n\n this._objects.push(object);\n }\n\n this.renderOnAddRemove && this.requestRenderAll();\n return this;\n },\n\n /**\n * Moves an object or a selection down in stack of drawn objects\n * An optional paramter, intersecting allowes to move the object in behind\n * the first intersecting object. Where intersection is calculated with\n * bounding box. If no intersection is found, there will not be change in the\n * stack.\n * @param {fabric.Object} object Object to send\n * @param {Boolean} [intersecting] If `true`, send object behind next lower intersecting object\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n sendBackwards: function (object, intersecting) {\n if (!object) {\n return this;\n }\n\n var activeSelection = this._activeObject,\n i,\n obj,\n idx,\n newIdx,\n objs,\n objsMoved = 0;\n\n if (object === activeSelection && object.type === 'activeSelection') {\n objs = activeSelection._objects;\n\n for (i = 0; i < objs.length; i++) {\n obj = objs[i];\n idx = this._objects.indexOf(obj);\n\n if (idx > 0 + objsMoved) {\n newIdx = idx - 1;\n removeFromArray(this._objects, obj);\n\n this._objects.splice(newIdx, 0, obj);\n }\n\n objsMoved++;\n }\n } else {\n idx = this._objects.indexOf(object);\n\n if (idx !== 0) {\n // if object is not on the bottom of stack\n newIdx = this._findNewLowerIndex(object, idx, intersecting);\n removeFromArray(this._objects, object);\n\n this._objects.splice(newIdx, 0, object);\n }\n }\n\n this.renderOnAddRemove && this.requestRenderAll();\n return this;\n },\n\n /**\n * @private\n */\n _findNewLowerIndex: function (object, idx, intersecting) {\n var newIdx, i;\n\n if (intersecting) {\n newIdx = idx; // traverse down the stack looking for the nearest intersecting object\n\n for (i = idx - 1; i >= 0; --i) {\n var isIntersecting = object.intersectsWithObject(this._objects[i]) || object.isContainedWithinObject(this._objects[i]) || this._objects[i].isContainedWithinObject(object);\n\n if (isIntersecting) {\n newIdx = i;\n break;\n }\n }\n } else {\n newIdx = idx - 1;\n }\n\n return newIdx;\n },\n\n /**\n * Moves an object or a selection up in stack of drawn objects\n * An optional paramter, intersecting allowes to move the object in front\n * of the first intersecting object. Where intersection is calculated with\n * bounding box. If no intersection is found, there will not be change in the\n * stack.\n * @param {fabric.Object} object Object to send\n * @param {Boolean} [intersecting] If `true`, send object in front of next upper intersecting object\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n bringForward: function (object, intersecting) {\n if (!object) {\n return this;\n }\n\n var activeSelection = this._activeObject,\n i,\n obj,\n idx,\n newIdx,\n objs,\n objsMoved = 0;\n\n if (object === activeSelection && object.type === 'activeSelection') {\n objs = activeSelection._objects;\n\n for (i = objs.length; i--;) {\n obj = objs[i];\n idx = this._objects.indexOf(obj);\n\n if (idx < this._objects.length - 1 - objsMoved) {\n newIdx = idx + 1;\n removeFromArray(this._objects, obj);\n\n this._objects.splice(newIdx, 0, obj);\n }\n\n objsMoved++;\n }\n } else {\n idx = this._objects.indexOf(object);\n\n if (idx !== this._objects.length - 1) {\n // if object is not on top of stack (last item in an array)\n newIdx = this._findNewUpperIndex(object, idx, intersecting);\n removeFromArray(this._objects, object);\n\n this._objects.splice(newIdx, 0, object);\n }\n }\n\n this.renderOnAddRemove && this.requestRenderAll();\n return this;\n },\n\n /**\n * @private\n */\n _findNewUpperIndex: function (object, idx, intersecting) {\n var newIdx, i, len;\n\n if (intersecting) {\n newIdx = idx; // traverse up the stack looking for the nearest intersecting object\n\n for (i = idx + 1, len = this._objects.length; i < len; ++i) {\n var isIntersecting = object.intersectsWithObject(this._objects[i]) || object.isContainedWithinObject(this._objects[i]) || this._objects[i].isContainedWithinObject(object);\n\n if (isIntersecting) {\n newIdx = i;\n break;\n }\n }\n } else {\n newIdx = idx + 1;\n }\n\n return newIdx;\n },\n\n /**\n * Moves an object to specified level in stack of drawn objects\n * @param {fabric.Object} object Object to send\n * @param {Number} index Position to move to\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n moveTo: function (object, index) {\n removeFromArray(this._objects, object);\n\n this._objects.splice(index, 0, object);\n\n return this.renderOnAddRemove && this.requestRenderAll();\n },\n\n /**\n * Clears a canvas element and dispose objects\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n dispose: function () {\n // cancel eventually ongoing renders\n if (this.isRendering) {\n fabric.util.cancelAnimFrame(this.isRendering);\n this.isRendering = 0;\n }\n\n this.forEachObject(function (object) {\n object.dispose && object.dispose();\n });\n this._objects = [];\n\n if (this.backgroundImage && this.backgroundImage.dispose) {\n this.backgroundImage.dispose();\n }\n\n this.backgroundImage = null;\n\n if (this.overlayImage && this.overlayImage.dispose) {\n this.overlayImage.dispose();\n }\n\n this.overlayImage = null;\n this._iTextInstances = null;\n this.contextContainer = null;\n fabric.util.cleanUpJsdomNode(this.lowerCanvasEl);\n this.lowerCanvasEl = undefined;\n return this;\n },\n\n /**\n * Returns a string representation of an instance\n * @return {String} string representation of an instance\n */\n toString: function () {\n return '#<fabric.Canvas (' + this.complexity() + '): ' + '{ objects: ' + this._objects.length + ' }>';\n }\n });\n extend(fabric.StaticCanvas.prototype, fabric.Observable);\n extend(fabric.StaticCanvas.prototype, fabric.Collection);\n extend(fabric.StaticCanvas.prototype, fabric.DataURLExporter);\n extend(fabric.StaticCanvas,\n /** @lends fabric.StaticCanvas */\n {\n /**\n * @static\n * @type String\n * @default\n */\n EMPTY_JSON: '{\"objects\": [], \"background\": \"white\"}',\n\n /**\n * Provides a way to check support of some of the canvas methods\n * (either those of HTMLCanvasElement itself, or rendering context)\n *\n * @param {String} methodName Method to check support for;\n * Could be one of \"setLineDash\"\n * @return {Boolean | null} `true` if method is supported (or at least exists),\n * `null` if canvas element or context can not be initialized\n */\n supports: function (methodName) {\n var el = createCanvasElement();\n\n if (!el || !el.getContext) {\n return null;\n }\n\n var ctx = el.getContext('2d');\n\n if (!ctx) {\n return null;\n }\n\n switch (methodName) {\n case 'setLineDash':\n return typeof ctx.setLineDash !== 'undefined';\n\n default:\n return null;\n }\n }\n });\n /**\n * Returns JSON representation of canvas\n * @function\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {String} JSON string\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-3#serialization}\n * @see {@link http://jsfiddle.net/fabricjs/pec86/|jsFiddle demo}\n * @example <caption>JSON without additional properties</caption>\n * var json = canvas.toJSON();\n * @example <caption>JSON with additional properties included</caption>\n * var json = canvas.toJSON(['lockMovementX', 'lockMovementY', 'lockRotation', 'lockScalingX', 'lockScalingY']);\n * @example <caption>JSON without default values</caption>\n * canvas.includeDefaultValues = false;\n * var json = canvas.toJSON();\n */\n\n fabric.StaticCanvas.prototype.toJSON = fabric.StaticCanvas.prototype.toObject;\n\n if (fabric.isLikelyNode) {\n fabric.StaticCanvas.prototype.createPNGStream = function () {\n var impl = getNodeCanvas(this.lowerCanvasEl);\n return impl && impl.createPNGStream();\n };\n\n fabric.StaticCanvas.prototype.createJPEGStream = function (opts) {\n var impl = getNodeCanvas(this.lowerCanvasEl);\n return impl && impl.createJPEGStream(opts);\n };\n }\n})();\n/**\n * BaseBrush class\n * @class fabric.BaseBrush\n * @see {@link http://fabricjs.com/freedrawing|Freedrawing demo}\n */\n\n\nfabric.BaseBrush = fabric.util.createClass(\n/** @lends fabric.BaseBrush.prototype */\n{\n /**\n * Color of a brush\n * @type String\n * @default\n */\n color: 'rgb(0, 0, 0)',\n\n /**\n * Width of a brush, has to be a Number, no string literals\n * @type Number\n * @default\n */\n width: 1,\n\n /**\n * Shadow object representing shadow of this shape.\n * <b>Backwards incompatibility note:</b> This property replaces \"shadowColor\" (String), \"shadowOffsetX\" (Number),\n * \"shadowOffsetY\" (Number) and \"shadowBlur\" (Number) since v1.2.12\n * @type fabric.Shadow\n * @default\n */\n shadow: null,\n\n /**\n * Line endings style of a brush (one of \"butt\", \"round\", \"square\")\n * @type String\n * @default\n */\n strokeLineCap: 'round',\n\n /**\n * Corner style of a brush (one of \"bevel\", \"round\", \"miter\")\n * @type String\n * @default\n */\n strokeLineJoin: 'round',\n\n /**\n * Maximum miter length (used for strokeLineJoin = \"miter\") of a brush's\n * @type Number\n * @default\n */\n strokeMiterLimit: 10,\n\n /**\n * Stroke Dash Array.\n * @type Array\n * @default\n */\n strokeDashArray: null,\n\n /**\n * Sets brush styles\n * @private\n */\n _setBrushStyles: function () {\n var ctx = this.canvas.contextTop;\n ctx.strokeStyle = this.color;\n ctx.lineWidth = this.width;\n ctx.lineCap = this.strokeLineCap;\n ctx.miterLimit = this.strokeMiterLimit;\n ctx.lineJoin = this.strokeLineJoin;\n\n if (fabric.StaticCanvas.supports('setLineDash')) {\n ctx.setLineDash(this.strokeDashArray || []);\n }\n },\n\n /**\n * Sets the transformation on given context\n * @param {RenderingContext2d} ctx context to render on\n * @private\n */\n _saveAndTransform: function (ctx) {\n var v = this.canvas.viewportTransform;\n ctx.save();\n ctx.transform(v[0], v[1], v[2], v[3], v[4], v[5]);\n },\n\n /**\n * Sets brush shadow styles\n * @private\n */\n _setShadow: function () {\n if (!this.shadow) {\n return;\n }\n\n var canvas = this.canvas,\n shadow = this.shadow,\n ctx = canvas.contextTop,\n zoom = canvas.getZoom();\n\n if (canvas && canvas._isRetinaScaling()) {\n zoom *= fabric.devicePixelRatio;\n }\n\n ctx.shadowColor = shadow.color;\n ctx.shadowBlur = shadow.blur * zoom;\n ctx.shadowOffsetX = shadow.offsetX * zoom;\n ctx.shadowOffsetY = shadow.offsetY * zoom;\n },\n needsFullRender: function () {\n var color = new fabric.Color(this.color);\n return color.getAlpha() < 1 || !!this.shadow;\n },\n\n /**\n * Removes brush shadow styles\n * @private\n */\n _resetShadow: function () {\n var ctx = this.canvas.contextTop;\n ctx.shadowColor = '';\n ctx.shadowBlur = ctx.shadowOffsetX = ctx.shadowOffsetY = 0;\n }\n});\n\n(function () {\n /**\n * PencilBrush class\n * @class fabric.PencilBrush\n * @extends fabric.BaseBrush\n */\n fabric.PencilBrush = fabric.util.createClass(fabric.BaseBrush,\n /** @lends fabric.PencilBrush.prototype */\n {\n /**\n * Discard points that are less than `decimate` pixel distant from each other\n * @type Number\n * @default 0.4\n */\n decimate: 0.4,\n\n /**\n * Constructor\n * @param {fabric.Canvas} canvas\n * @return {fabric.PencilBrush} Instance of a pencil brush\n */\n initialize: function (canvas) {\n this.canvas = canvas;\n this._points = [];\n },\n\n /**\n * Invoked inside on mouse down and mouse move\n * @param {Object} pointer\n */\n _drawSegment: function (ctx, p1, p2) {\n var midPoint = p1.midPointFrom(p2);\n ctx.quadraticCurveTo(p1.x, p1.y, midPoint.x, midPoint.y);\n return midPoint;\n },\n\n /**\n * Inovoked on mouse down\n * @param {Object} pointer\n */\n onMouseDown: function (pointer, options) {\n if (!this.canvas._isMainEvent(options.e)) {\n return;\n }\n\n this._prepareForDrawing(pointer); // capture coordinates immediately\n // this allows to draw dots (when movement never occurs)\n\n\n this._captureDrawingPath(pointer);\n\n this._render();\n },\n\n /**\n * Inovoked on mouse move\n * @param {Object} pointer\n */\n onMouseMove: function (pointer, options) {\n if (!this.canvas._isMainEvent(options.e)) {\n return;\n }\n\n if (this._captureDrawingPath(pointer) && this._points.length > 1) {\n if (this.needsFullRender()) {\n // redraw curve\n // clear top canvas\n this.canvas.clearContext(this.canvas.contextTop);\n\n this._render();\n } else {\n var points = this._points,\n length = points.length,\n ctx = this.canvas.contextTop; // draw the curve update\n\n this._saveAndTransform(ctx);\n\n if (this.oldEnd) {\n ctx.beginPath();\n ctx.moveTo(this.oldEnd.x, this.oldEnd.y);\n }\n\n this.oldEnd = this._drawSegment(ctx, points[length - 2], points[length - 1], true);\n ctx.stroke();\n ctx.restore();\n }\n }\n },\n\n /**\n * Invoked on mouse up\n */\n onMouseUp: function (options) {\n if (!this.canvas._isMainEvent(options.e)) {\n return true;\n }\n\n this.oldEnd = undefined;\n\n this._finalizeAndAddPath();\n\n return false;\n },\n\n /**\n * @private\n * @param {Object} pointer Actual mouse position related to the canvas.\n */\n _prepareForDrawing: function (pointer) {\n var p = new fabric.Point(pointer.x, pointer.y);\n\n this._reset();\n\n this._addPoint(p);\n\n this.canvas.contextTop.moveTo(p.x, p.y);\n },\n\n /**\n * @private\n * @param {fabric.Point} point Point to be added to points array\n */\n _addPoint: function (point) {\n if (this._points.length > 1 && point.eq(this._points[this._points.length - 1])) {\n return false;\n }\n\n this._points.push(point);\n\n return true;\n },\n\n /**\n * Clear points array and set contextTop canvas style.\n * @private\n */\n _reset: function () {\n this._points = [];\n\n this._setBrushStyles();\n\n this._setShadow();\n },\n\n /**\n * @private\n * @param {Object} pointer Actual mouse position related to the canvas.\n */\n _captureDrawingPath: function (pointer) {\n var pointerPoint = new fabric.Point(pointer.x, pointer.y);\n return this._addPoint(pointerPoint);\n },\n\n /**\n * Draw a smooth path on the topCanvas using quadraticCurveTo\n * @private\n */\n _render: function () {\n var ctx = this.canvas.contextTop,\n i,\n len,\n p1 = this._points[0],\n p2 = this._points[1];\n\n this._saveAndTransform(ctx);\n\n ctx.beginPath(); //if we only have 2 points in the path and they are the same\n //it means that the user only clicked the canvas without moving the mouse\n //then we should be drawing a dot. A path isn't drawn between two identical dots\n //that's why we set them apart a bit\n\n if (this._points.length === 2 && p1.x === p2.x && p1.y === p2.y) {\n var width = this.width / 1000;\n p1 = new fabric.Point(p1.x, p1.y);\n p2 = new fabric.Point(p2.x, p2.y);\n p1.x -= width;\n p2.x += width;\n }\n\n ctx.moveTo(p1.x, p1.y);\n\n for (i = 1, len = this._points.length; i < len; i++) {\n // we pick the point between pi + 1 & pi + 2 as the\n // end point and p1 as our control point.\n this._drawSegment(ctx, p1, p2);\n\n p1 = this._points[i];\n p2 = this._points[i + 1];\n } // Draw last line as a straight line while\n // we wait for the next point to be able to calculate\n // the bezier control point\n\n\n ctx.lineTo(p1.x, p1.y);\n ctx.stroke();\n ctx.restore();\n },\n\n /**\n * Converts points to SVG path\n * @param {Array} points Array of points\n * @return {String} SVG path\n */\n convertPointsToSVGPath: function (points) {\n var path = [],\n i,\n width = this.width / 1000,\n p1 = new fabric.Point(points[0].x, points[0].y),\n p2 = new fabric.Point(points[1].x, points[1].y),\n len = points.length,\n multSignX = 1,\n multSignY = 0,\n manyPoints = len > 2;\n\n if (manyPoints) {\n multSignX = points[2].x < p2.x ? -1 : points[2].x === p2.x ? 0 : 1;\n multSignY = points[2].y < p2.y ? -1 : points[2].y === p2.y ? 0 : 1;\n }\n\n path.push('M ', p1.x - multSignX * width, ' ', p1.y - multSignY * width, ' ');\n\n for (i = 1; i < len; i++) {\n if (!p1.eq(p2)) {\n var midPoint = p1.midPointFrom(p2); // p1 is our bezier control point\n // midpoint is our endpoint\n // start point is p(i-1) value.\n\n path.push('Q ', p1.x, ' ', p1.y, ' ', midPoint.x, ' ', midPoint.y, ' ');\n }\n\n p1 = points[i];\n\n if (i + 1 < points.length) {\n p2 = points[i + 1];\n }\n }\n\n if (manyPoints) {\n multSignX = p1.x > points[i - 2].x ? 1 : p1.x === points[i - 2].x ? 0 : -1;\n multSignY = p1.y > points[i - 2].y ? 1 : p1.y === points[i - 2].y ? 0 : -1;\n }\n\n path.push('L ', p1.x + multSignX * width, ' ', p1.y + multSignY * width);\n return path;\n },\n\n /**\n * Creates fabric.Path object to add on canvas\n * @param {String} pathData Path data\n * @return {fabric.Path} Path to add on canvas\n */\n createPath: function (pathData) {\n var path = new fabric.Path(pathData, {\n fill: null,\n stroke: this.color,\n strokeWidth: this.width,\n strokeLineCap: this.strokeLineCap,\n strokeMiterLimit: this.strokeMiterLimit,\n strokeLineJoin: this.strokeLineJoin,\n strokeDashArray: this.strokeDashArray\n });\n\n if (this.shadow) {\n this.shadow.affectStroke = true;\n path.shadow = new fabric.Shadow(this.shadow);\n }\n\n return path;\n },\n\n /**\n * Decimate poins array with the decimate value\n */\n decimatePoints: function (points, distance) {\n if (points.length <= 2) {\n return points;\n }\n\n var zoom = this.canvas.getZoom(),\n adjustedDistance = Math.pow(distance / zoom, 2),\n i,\n l = points.length - 1,\n lastPoint = points[0],\n newPoints = [lastPoint],\n cDistance;\n\n for (i = 1; i < l; i++) {\n cDistance = Math.pow(lastPoint.x - points[i].x, 2) + Math.pow(lastPoint.y - points[i].y, 2);\n\n if (cDistance >= adjustedDistance) {\n lastPoint = points[i];\n newPoints.push(lastPoint);\n }\n }\n\n if (newPoints.length === 1) {\n newPoints.push(new fabric.Point(newPoints[0].x, newPoints[0].y));\n }\n\n return newPoints;\n },\n\n /**\n * On mouseup after drawing the path on contextTop canvas\n * we use the points captured to create an new fabric path object\n * and add it to the fabric canvas.\n */\n _finalizeAndAddPath: function () {\n var ctx = this.canvas.contextTop;\n ctx.closePath();\n\n if (this.decimate) {\n this._points = this.decimatePoints(this._points, this.decimate);\n }\n\n var pathData = this.convertPointsToSVGPath(this._points).join('');\n\n if (pathData === 'M 0 0 Q 0 0 0 0 L 0 0') {\n // do not create 0 width/height paths, as they are\n // rendered inconsistently across browsers\n // Firefox 4, for example, renders a dot,\n // whereas Chrome 10 renders nothing\n this.canvas.requestRenderAll();\n return;\n }\n\n var path = this.createPath(pathData);\n this.canvas.clearContext(this.canvas.contextTop);\n this.canvas.fire('before:path:created', {\n path: path\n });\n this.canvas.add(path);\n this.canvas.requestRenderAll();\n path.setCoords();\n\n this._resetShadow(); // fire event 'path' created\n\n\n this.canvas.fire('path:created', {\n path: path\n });\n }\n });\n})();\n/**\n * CircleBrush class\n * @class fabric.CircleBrush\n */\n\n\nfabric.CircleBrush = fabric.util.createClass(fabric.BaseBrush,\n/** @lends fabric.CircleBrush.prototype */\n{\n /**\n * Width of a brush\n * @type Number\n * @default\n */\n width: 10,\n\n /**\n * Constructor\n * @param {fabric.Canvas} canvas\n * @return {fabric.CircleBrush} Instance of a circle brush\n */\n initialize: function (canvas) {\n this.canvas = canvas;\n this.points = [];\n },\n\n /**\n * Invoked inside on mouse down and mouse move\n * @param {Object} pointer\n */\n drawDot: function (pointer) {\n var point = this.addPoint(pointer),\n ctx = this.canvas.contextTop;\n\n this._saveAndTransform(ctx);\n\n this.dot(ctx, point);\n ctx.restore();\n },\n dot: function (ctx, point) {\n ctx.fillStyle = point.fill;\n ctx.beginPath();\n ctx.arc(point.x, point.y, point.radius, 0, Math.PI * 2, false);\n ctx.closePath();\n ctx.fill();\n },\n\n /**\n * Invoked on mouse down\n */\n onMouseDown: function (pointer) {\n this.points.length = 0;\n this.canvas.clearContext(this.canvas.contextTop);\n\n this._setShadow();\n\n this.drawDot(pointer);\n },\n\n /**\n * Render the full state of the brush\n * @private\n */\n _render: function () {\n var ctx = this.canvas.contextTop,\n i,\n len,\n points = this.points;\n\n this._saveAndTransform(ctx);\n\n for (i = 0, len = points.length; i < len; i++) {\n this.dot(ctx, points[i]);\n }\n\n ctx.restore();\n },\n\n /**\n * Invoked on mouse move\n * @param {Object} pointer\n */\n onMouseMove: function (pointer) {\n if (this.needsFullRender()) {\n this.canvas.clearContext(this.canvas.contextTop);\n this.addPoint(pointer);\n\n this._render();\n } else {\n this.drawDot(pointer);\n }\n },\n\n /**\n * Invoked on mouse up\n */\n onMouseUp: function () {\n var originalRenderOnAddRemove = this.canvas.renderOnAddRemove,\n i,\n len;\n this.canvas.renderOnAddRemove = false;\n var circles = [];\n\n for (i = 0, len = this.points.length; i < len; i++) {\n var point = this.points[i],\n circle = new fabric.Circle({\n radius: point.radius,\n left: point.x,\n top: point.y,\n originX: 'center',\n originY: 'center',\n fill: point.fill\n });\n this.shadow && (circle.shadow = new fabric.Shadow(this.shadow));\n circles.push(circle);\n }\n\n var group = new fabric.Group(circles);\n group.canvas = this.canvas;\n this.canvas.fire('before:path:created', {\n path: group\n });\n this.canvas.add(group);\n this.canvas.fire('path:created', {\n path: group\n });\n this.canvas.clearContext(this.canvas.contextTop);\n\n this._resetShadow();\n\n this.canvas.renderOnAddRemove = originalRenderOnAddRemove;\n this.canvas.requestRenderAll();\n },\n\n /**\n * @param {Object} pointer\n * @return {fabric.Point} Just added pointer point\n */\n addPoint: function (pointer) {\n var pointerPoint = new fabric.Point(pointer.x, pointer.y),\n circleRadius = fabric.util.getRandomInt(Math.max(0, this.width - 20), this.width + 20) / 2,\n circleColor = new fabric.Color(this.color).setAlpha(fabric.util.getRandomInt(0, 100) / 100).toRgba();\n pointerPoint.radius = circleRadius;\n pointerPoint.fill = circleColor;\n this.points.push(pointerPoint);\n return pointerPoint;\n }\n});\n/**\n * SprayBrush class\n * @class fabric.SprayBrush\n */\n\nfabric.SprayBrush = fabric.util.createClass(fabric.BaseBrush,\n/** @lends fabric.SprayBrush.prototype */\n{\n /**\n * Width of a spray\n * @type Number\n * @default\n */\n width: 10,\n\n /**\n * Density of a spray (number of dots per chunk)\n * @type Number\n * @default\n */\n density: 20,\n\n /**\n * Width of spray dots\n * @type Number\n * @default\n */\n dotWidth: 1,\n\n /**\n * Width variance of spray dots\n * @type Number\n * @default\n */\n dotWidthVariance: 1,\n\n /**\n * Whether opacity of a dot should be random\n * @type Boolean\n * @default\n */\n randomOpacity: false,\n\n /**\n * Whether overlapping dots (rectangles) should be removed (for performance reasons)\n * @type Boolean\n * @default\n */\n optimizeOverlapping: true,\n\n /**\n * Constructor\n * @param {fabric.Canvas} canvas\n * @return {fabric.SprayBrush} Instance of a spray brush\n */\n initialize: function (canvas) {\n this.canvas = canvas;\n this.sprayChunks = [];\n },\n\n /**\n * Invoked on mouse down\n * @param {Object} pointer\n */\n onMouseDown: function (pointer) {\n this.sprayChunks.length = 0;\n this.canvas.clearContext(this.canvas.contextTop);\n\n this._setShadow();\n\n this.addSprayChunk(pointer);\n this.render(this.sprayChunkPoints);\n },\n\n /**\n * Invoked on mouse move\n * @param {Object} pointer\n */\n onMouseMove: function (pointer) {\n this.addSprayChunk(pointer);\n this.render(this.sprayChunkPoints);\n },\n\n /**\n * Invoked on mouse up\n */\n onMouseUp: function () {\n var originalRenderOnAddRemove = this.canvas.renderOnAddRemove;\n this.canvas.renderOnAddRemove = false;\n var rects = [];\n\n for (var i = 0, ilen = this.sprayChunks.length; i < ilen; i++) {\n var sprayChunk = this.sprayChunks[i];\n\n for (var j = 0, jlen = sprayChunk.length; j < jlen; j++) {\n var rect = new fabric.Rect({\n width: sprayChunk[j].width,\n height: sprayChunk[j].width,\n left: sprayChunk[j].x + 1,\n top: sprayChunk[j].y + 1,\n originX: 'center',\n originY: 'center',\n fill: this.color\n });\n rects.push(rect);\n }\n }\n\n if (this.optimizeOverlapping) {\n rects = this._getOptimizedRects(rects);\n }\n\n var group = new fabric.Group(rects);\n this.shadow && group.set('shadow', new fabric.Shadow(this.shadow));\n this.canvas.fire('before:path:created', {\n path: group\n });\n this.canvas.add(group);\n this.canvas.fire('path:created', {\n path: group\n });\n this.canvas.clearContext(this.canvas.contextTop);\n\n this._resetShadow();\n\n this.canvas.renderOnAddRemove = originalRenderOnAddRemove;\n this.canvas.requestRenderAll();\n },\n\n /**\n * @private\n * @param {Array} rects\n */\n _getOptimizedRects: function (rects) {\n // avoid creating duplicate rects at the same coordinates\n var uniqueRects = {},\n key,\n i,\n len;\n\n for (i = 0, len = rects.length; i < len; i++) {\n key = rects[i].left + '' + rects[i].top;\n\n if (!uniqueRects[key]) {\n uniqueRects[key] = rects[i];\n }\n }\n\n var uniqueRectsArray = [];\n\n for (key in uniqueRects) {\n uniqueRectsArray.push(uniqueRects[key]);\n }\n\n return uniqueRectsArray;\n },\n\n /**\n * Render new chunk of spray brush\n */\n render: function (sprayChunk) {\n var ctx = this.canvas.contextTop,\n i,\n len;\n ctx.fillStyle = this.color;\n\n this._saveAndTransform(ctx);\n\n for (i = 0, len = sprayChunk.length; i < len; i++) {\n var point = sprayChunk[i];\n\n if (typeof point.opacity !== 'undefined') {\n ctx.globalAlpha = point.opacity;\n }\n\n ctx.fillRect(point.x, point.y, point.width, point.width);\n }\n\n ctx.restore();\n },\n\n /**\n * Render all spray chunks\n */\n _render: function () {\n var ctx = this.canvas.contextTop,\n i,\n ilen;\n ctx.fillStyle = this.color;\n\n this._saveAndTransform(ctx);\n\n for (i = 0, ilen = this.sprayChunks.length; i < ilen; i++) {\n this.render(this.sprayChunks[i]);\n }\n\n ctx.restore();\n },\n\n /**\n * @param {Object} pointer\n */\n addSprayChunk: function (pointer) {\n this.sprayChunkPoints = [];\n var x,\n y,\n width,\n radius = this.width / 2,\n i;\n\n for (i = 0; i < this.density; i++) {\n x = fabric.util.getRandomInt(pointer.x - radius, pointer.x + radius);\n y = fabric.util.getRandomInt(pointer.y - radius, pointer.y + radius);\n\n if (this.dotWidthVariance) {\n width = fabric.util.getRandomInt( // bottom clamp width to 1\n Math.max(1, this.dotWidth - this.dotWidthVariance), this.dotWidth + this.dotWidthVariance);\n } else {\n width = this.dotWidth;\n }\n\n var point = new fabric.Point(x, y);\n point.width = width;\n\n if (this.randomOpacity) {\n point.opacity = fabric.util.getRandomInt(0, 100) / 100;\n }\n\n this.sprayChunkPoints.push(point);\n }\n\n this.sprayChunks.push(this.sprayChunkPoints);\n }\n});\n/**\n * PatternBrush class\n * @class fabric.PatternBrush\n * @extends fabric.BaseBrush\n */\n\nfabric.PatternBrush = fabric.util.createClass(fabric.PencilBrush,\n/** @lends fabric.PatternBrush.prototype */\n{\n getPatternSrc: function () {\n var dotWidth = 20,\n dotDistance = 5,\n patternCanvas = fabric.util.createCanvasElement(),\n patternCtx = patternCanvas.getContext('2d');\n patternCanvas.width = patternCanvas.height = dotWidth + dotDistance;\n patternCtx.fillStyle = this.color;\n patternCtx.beginPath();\n patternCtx.arc(dotWidth / 2, dotWidth / 2, dotWidth / 2, 0, Math.PI * 2, false);\n patternCtx.closePath();\n patternCtx.fill();\n return patternCanvas;\n },\n getPatternSrcFunction: function () {\n return String(this.getPatternSrc).replace('this.color', '\"' + this.color + '\"');\n },\n\n /**\n * Creates \"pattern\" instance property\n */\n getPattern: function () {\n return this.canvas.contextTop.createPattern(this.source || this.getPatternSrc(), 'repeat');\n },\n\n /**\n * Sets brush styles\n */\n _setBrushStyles: function () {\n this.callSuper('_setBrushStyles');\n this.canvas.contextTop.strokeStyle = this.getPattern();\n },\n\n /**\n * Creates path\n */\n createPath: function (pathData) {\n var path = this.callSuper('createPath', pathData),\n topLeft = path._getLeftTopCoords().scalarAdd(path.strokeWidth / 2);\n\n path.stroke = new fabric.Pattern({\n source: this.source || this.getPatternSrcFunction(),\n offsetX: -topLeft.x,\n offsetY: -topLeft.y\n });\n return path;\n }\n});\n\n(function () {\n var getPointer = fabric.util.getPointer,\n degreesToRadians = fabric.util.degreesToRadians,\n abs = Math.abs,\n supportLineDash = fabric.StaticCanvas.supports('setLineDash'),\n isTouchEvent = fabric.util.isTouchEvent,\n STROKE_OFFSET = 0.5;\n /**\n * Canvas class\n * @class fabric.Canvas\n * @extends fabric.StaticCanvas\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-1#canvas}\n * @see {@link fabric.Canvas#initialize} for constructor definition\n *\n * @fires object:modified at the end of a transform or any change when statefull is true\n * @fires object:rotating while an object is being rotated from the control\n * @fires object:scaling while an object is being scaled by controls\n * @fires object:moving while an object is being dragged\n * @fires object:skewing while an object is being skewed from the controls\n *\n * @fires before:transform before a transform is is started\n * @fires before:selection:cleared\n * @fires selection:cleared\n * @fires selection:updated\n * @fires selection:created\n *\n * @fires path:created after a drawing operation ends and the path is added\n * @fires mouse:down\n * @fires mouse:move\n * @fires mouse:up\n * @fires mouse:down:before on mouse down, before the inner fabric logic runs\n * @fires mouse:move:before on mouse move, before the inner fabric logic runs\n * @fires mouse:up:before on mouse up, before the inner fabric logic runs\n * @fires mouse:over\n * @fires mouse:out\n * @fires mouse:dblclick whenever a native dbl click event fires on the canvas.\n *\n * @fires dragover\n * @fires dragenter\n * @fires dragleave\n * @fires drop\n * @fires after:render at the end of the render process, receives the context in the callback\n * @fires before:render at start the render process, receives the context in the callback\n *\n * the following events are deprecated:\n * @fires object:rotated at the end of a rotation transform\n * @fires object:scaled at the end of a scale transform\n * @fires object:moved at the end of translation transform\n * @fires object:skewed at the end of a skew transform\n */\n\n fabric.Canvas = fabric.util.createClass(fabric.StaticCanvas,\n /** @lends fabric.Canvas.prototype */\n {\n /**\n * Constructor\n * @param {HTMLElement | String} el <canvas> element to initialize instance on\n * @param {Object} [options] Options object\n * @return {Object} thisArg\n */\n initialize: function (el, options) {\n options || (options = {});\n this.renderAndResetBound = this.renderAndReset.bind(this);\n this.requestRenderAllBound = this.requestRenderAll.bind(this);\n\n this._initStatic(el, options);\n\n this._initInteractive();\n\n this._createCacheCanvas();\n },\n\n /**\n * When true, objects can be transformed by one side (unproportionally)\n * when dragged on the corners that normally would not do that.\n * @type Boolean\n * @default\n * @since fabric 4.0 // changed name and default value\n */\n uniformScaling: true,\n\n /**\n * Indicates which key switches uniform scaling.\n * values: 'altKey', 'shiftKey', 'ctrlKey'.\n * If `null` or 'none' or any other string that is not a modifier key\n * feature is disabled.\n * totally wrong named. this sounds like `uniform scaling`\n * if Canvas.uniformScaling is true, pressing this will set it to false\n * and viceversa.\n * @since 1.6.2\n * @type String\n * @default\n */\n uniScaleKey: 'shiftKey',\n\n /**\n * When true, objects use center point as the origin of scale transformation.\n * <b>Backwards incompatibility note:</b> This property replaces \"centerTransform\" (Boolean).\n * @since 1.3.4\n * @type Boolean\n * @default\n */\n centeredScaling: false,\n\n /**\n * When true, objects use center point as the origin of rotate transformation.\n * <b>Backwards incompatibility note:</b> This property replaces \"centerTransform\" (Boolean).\n * @since 1.3.4\n * @type Boolean\n * @default\n */\n centeredRotation: false,\n\n /**\n * Indicates which key enable centered Transform\n * values: 'altKey', 'shiftKey', 'ctrlKey'.\n * If `null` or 'none' or any other string that is not a modifier key\n * feature is disabled feature disabled.\n * @since 1.6.2\n * @type String\n * @default\n */\n centeredKey: 'altKey',\n\n /**\n * Indicates which key enable alternate action on corner\n * values: 'altKey', 'shiftKey', 'ctrlKey'.\n * If `null` or 'none' or any other string that is not a modifier key\n * feature is disabled feature disabled.\n * @since 1.6.2\n * @type String\n * @default\n */\n altActionKey: 'shiftKey',\n\n /**\n * Indicates that canvas is interactive. This property should not be changed.\n * @type Boolean\n * @default\n */\n interactive: true,\n\n /**\n * Indicates whether group selection should be enabled\n * @type Boolean\n * @default\n */\n selection: true,\n\n /**\n * Indicates which key or keys enable multiple click selection\n * Pass value as a string or array of strings\n * values: 'altKey', 'shiftKey', 'ctrlKey'.\n * If `null` or empty or containing any other string that is not a modifier key\n * feature is disabled.\n * @since 1.6.2\n * @type String|Array\n * @default\n */\n selectionKey: 'shiftKey',\n\n /**\n * Indicates which key enable alternative selection\n * in case of target overlapping with active object\n * values: 'altKey', 'shiftKey', 'ctrlKey'.\n * For a series of reason that come from the general expectations on how\n * things should work, this feature works only for preserveObjectStacking true.\n * If `null` or 'none' or any other string that is not a modifier key\n * feature is disabled.\n * @since 1.6.5\n * @type null|String\n * @default\n */\n altSelectionKey: null,\n\n /**\n * Color of selection\n * @type String\n * @default\n */\n selectionColor: 'rgba(100, 100, 255, 0.3)',\n // blue\n\n /**\n * Default dash array pattern\n * If not empty the selection border is dashed\n * @type Array\n */\n selectionDashArray: [],\n\n /**\n * Color of the border of selection (usually slightly darker than color of selection itself)\n * @type String\n * @default\n */\n selectionBorderColor: 'rgba(255, 255, 255, 0.3)',\n\n /**\n * Width of a line used in object/group selection\n * @type Number\n * @default\n */\n selectionLineWidth: 1,\n\n /**\n * Select only shapes that are fully contained in the dragged selection rectangle.\n * @type Boolean\n * @default\n */\n selectionFullyContained: false,\n\n /**\n * Default cursor value used when hovering over an object on canvas\n * @type String\n * @default\n */\n hoverCursor: 'move',\n\n /**\n * Default cursor value used when moving an object on canvas\n * @type String\n * @default\n */\n moveCursor: 'move',\n\n /**\n * Default cursor value used for the entire canvas\n * @type String\n * @default\n */\n defaultCursor: 'default',\n\n /**\n * Cursor value used during free drawing\n * @type String\n * @default\n */\n freeDrawingCursor: 'crosshair',\n\n /**\n * Cursor value used for rotation point\n * @type String\n * @default\n */\n rotationCursor: 'crosshair',\n\n /**\n * Cursor value used for disabled elements ( corners with disabled action )\n * @type String\n * @since 2.0.0\n * @default\n */\n notAllowedCursor: 'not-allowed',\n\n /**\n * Default element class that's given to wrapper (div) element of canvas\n * @type String\n * @default\n */\n containerClass: 'canvas-container',\n\n /**\n * When true, object detection happens on per-pixel basis rather than on per-bounding-box\n * @type Boolean\n * @default\n */\n perPixelTargetFind: false,\n\n /**\n * Number of pixels around target pixel to tolerate (consider active) during object detection\n * @type Number\n * @default\n */\n targetFindTolerance: 0,\n\n /**\n * When true, target detection is skipped. Target detection will return always undefined.\n * click selection won't work anymore, events will fire with no targets.\n * if something is selected before setting it to true, it will be deselected at the first click.\n * area selection will still work. check the `selection` property too.\n * if you deactivate both, you should look into staticCanvas.\n * @type Boolean\n * @default\n */\n skipTargetFind: false,\n\n /**\n * When true, mouse events on canvas (mousedown/mousemove/mouseup) result in free drawing.\n * After mousedown, mousemove creates a shape,\n * and then mouseup finalizes it and adds an instance of `fabric.Path` onto canvas.\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-4#free_drawing}\n * @type Boolean\n * @default\n */\n isDrawingMode: false,\n\n /**\n * Indicates whether objects should remain in current stack position when selected.\n * When false objects are brought to top and rendered as part of the selection group\n * @type Boolean\n * @default\n */\n preserveObjectStacking: false,\n\n /**\n * Indicates the angle that an object will lock to while rotating.\n * @type Number\n * @since 1.6.7\n * @default\n */\n snapAngle: 0,\n\n /**\n * Indicates the distance from the snapAngle the rotation will lock to the snapAngle.\n * When `null`, the snapThreshold will default to the snapAngle.\n * @type null|Number\n * @since 1.6.7\n * @default\n */\n snapThreshold: null,\n\n /**\n * Indicates if the right click on canvas can output the context menu or not\n * @type Boolean\n * @since 1.6.5\n * @default\n */\n stopContextMenu: false,\n\n /**\n * Indicates if the canvas can fire right click events\n * @type Boolean\n * @since 1.6.5\n * @default\n */\n fireRightClick: false,\n\n /**\n * Indicates if the canvas can fire middle click events\n * @type Boolean\n * @since 1.7.8\n * @default\n */\n fireMiddleClick: false,\n\n /**\n * Keep track of the subTargets for Mouse Events\n * @type fabric.Object[]\n */\n targets: [],\n\n /**\n * Keep track of the hovered target\n * @type fabric.Object\n * @private\n */\n _hoveredTarget: null,\n\n /**\n * hold the list of nested targets hovered\n * @type fabric.Object[]\n * @private\n */\n _hoveredTargets: [],\n\n /**\n * @private\n */\n _initInteractive: function () {\n this._currentTransform = null;\n this._groupSelector = null;\n\n this._initWrapperElement();\n\n this._createUpperCanvas();\n\n this._initEventListeners();\n\n this._initRetinaScaling();\n\n this.freeDrawingBrush = fabric.PencilBrush && new fabric.PencilBrush(this);\n this.calcOffset();\n },\n\n /**\n * Divides objects in two groups, one to render immediately\n * and one to render as activeGroup.\n * @return {Array} objects to render immediately and pushes the other in the activeGroup.\n */\n _chooseObjectsToRender: function () {\n var activeObjects = this.getActiveObjects(),\n object,\n objsToRender,\n activeGroupObjects;\n\n if (activeObjects.length > 0 && !this.preserveObjectStacking) {\n objsToRender = [];\n activeGroupObjects = [];\n\n for (var i = 0, length = this._objects.length; i < length; i++) {\n object = this._objects[i];\n\n if (activeObjects.indexOf(object) === -1) {\n objsToRender.push(object);\n } else {\n activeGroupObjects.push(object);\n }\n }\n\n if (activeObjects.length > 1) {\n this._activeObject._objects = activeGroupObjects;\n }\n\n objsToRender.push.apply(objsToRender, activeGroupObjects);\n } else {\n objsToRender = this._objects;\n }\n\n return objsToRender;\n },\n\n /**\n * Renders both the top canvas and the secondary container canvas.\n * @return {fabric.Canvas} instance\n * @chainable\n */\n renderAll: function () {\n if (this.contextTopDirty && !this._groupSelector && !this.isDrawingMode) {\n this.clearContext(this.contextTop);\n this.contextTopDirty = false;\n }\n\n if (this.hasLostContext) {\n this.renderTopLayer(this.contextTop);\n }\n\n var canvasToDrawOn = this.contextContainer;\n this.renderCanvas(canvasToDrawOn, this._chooseObjectsToRender());\n return this;\n },\n renderTopLayer: function (ctx) {\n ctx.save();\n\n if (this.isDrawingMode && this._isCurrentlyDrawing) {\n this.freeDrawingBrush && this.freeDrawingBrush._render();\n this.contextTopDirty = true;\n } // we render the top context - last object\n\n\n if (this.selection && this._groupSelector) {\n this._drawSelection(ctx);\n\n this.contextTopDirty = true;\n }\n\n ctx.restore();\n },\n\n /**\n * Method to render only the top canvas.\n * Also used to render the group selection box.\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n renderTop: function () {\n var ctx = this.contextTop;\n this.clearContext(ctx);\n this.renderTopLayer(ctx);\n this.fire('after:render');\n return this;\n },\n\n /**\n * @private\n */\n _normalizePointer: function (object, pointer) {\n var m = object.calcTransformMatrix(),\n invertedM = fabric.util.invertTransform(m),\n vptPointer = this.restorePointerVpt(pointer);\n return fabric.util.transformPoint(vptPointer, invertedM);\n },\n\n /**\n * Returns true if object is transparent at a certain location\n * @param {fabric.Object} target Object to check\n * @param {Number} x Left coordinate\n * @param {Number} y Top coordinate\n * @return {Boolean}\n */\n isTargetTransparent: function (target, x, y) {\n // in case the target is the activeObject, we cannot execute this optimization\n // because we need to draw controls too.\n if (target.shouldCache() && target._cacheCanvas && target !== this._activeObject) {\n var normalizedPointer = this._normalizePointer(target, {\n x: x,\n y: y\n }),\n targetRelativeX = Math.max(target.cacheTranslationX + normalizedPointer.x * target.zoomX, 0),\n targetRelativeY = Math.max(target.cacheTranslationY + normalizedPointer.y * target.zoomY, 0);\n\n var isTransparent = fabric.util.isTransparent(target._cacheContext, Math.round(targetRelativeX), Math.round(targetRelativeY), this.targetFindTolerance);\n return isTransparent;\n }\n\n var ctx = this.contextCache,\n originalColor = target.selectionBackgroundColor,\n v = this.viewportTransform;\n target.selectionBackgroundColor = '';\n this.clearContext(ctx);\n ctx.save();\n ctx.transform(v[0], v[1], v[2], v[3], v[4], v[5]);\n target.render(ctx);\n ctx.restore();\n target === this._activeObject && target._renderControls(ctx, {\n hasBorders: false,\n transparentCorners: false\n }, {\n hasBorders: false\n });\n target.selectionBackgroundColor = originalColor;\n var isTransparent = fabric.util.isTransparent(ctx, x, y, this.targetFindTolerance);\n return isTransparent;\n },\n\n /**\n * takes an event and determins if selection key has been pressed\n * @private\n * @param {Event} e Event object\n */\n _isSelectionKeyPressed: function (e) {\n var selectionKeyPressed = false;\n\n if (Object.prototype.toString.call(this.selectionKey) === '[object Array]') {\n selectionKeyPressed = !!this.selectionKey.find(function (key) {\n return e[key] === true;\n });\n } else {\n selectionKeyPressed = e[this.selectionKey];\n }\n\n return selectionKeyPressed;\n },\n\n /**\n * @private\n * @param {Event} e Event object\n * @param {fabric.Object} target\n */\n _shouldClearSelection: function (e, target) {\n var activeObjects = this.getActiveObjects(),\n activeObject = this._activeObject;\n return !target || target && activeObject && activeObjects.length > 1 && activeObjects.indexOf(target) === -1 && activeObject !== target && !this._isSelectionKeyPressed(e) || target && !target.evented || target && !target.selectable && activeObject && activeObject !== target;\n },\n\n /**\n * centeredScaling from object can't override centeredScaling from canvas.\n * this should be fixed, since object setting should take precedence over canvas.\n * also this should be something that will be migrated in the control properties.\n * as ability to define the origin of the transformation that the control provide.\n * @private\n * @param {fabric.Object} target\n * @param {String} action\n * @param {Boolean} altKey\n */\n _shouldCenterTransform: function (target, action, altKey) {\n if (!target) {\n return;\n }\n\n var centerTransform;\n\n if (action === 'scale' || action === 'scaleX' || action === 'scaleY' || action === 'resizing') {\n centerTransform = this.centeredScaling || target.centeredScaling;\n } else if (action === 'rotate') {\n centerTransform = this.centeredRotation || target.centeredRotation;\n }\n\n return centerTransform ? !altKey : altKey;\n },\n\n /**\n * should disappear before release 4.0\n * @private\n */\n _getOriginFromCorner: function (target, corner) {\n var origin = {\n x: target.originX,\n y: target.originY\n };\n\n if (corner === 'ml' || corner === 'tl' || corner === 'bl') {\n origin.x = 'right';\n } else if (corner === 'mr' || corner === 'tr' || corner === 'br') {\n origin.x = 'left';\n }\n\n if (corner === 'tl' || corner === 'mt' || corner === 'tr') {\n origin.y = 'bottom';\n } else if (corner === 'bl' || corner === 'mb' || corner === 'br') {\n origin.y = 'top';\n } else if (corner === 'mtr') {\n origin.x = 'center';\n origin.y = 'center';\n }\n\n return origin;\n },\n\n /**\n * @private\n * @param {Boolean} alreadySelected true if target is already selected\n * @param {String} corner a string representing the corner ml, mr, tl ...\n * @param {Event} e Event object\n * @param {fabric.Object} [target] inserted back to help overriding. Unused\n */\n _getActionFromCorner: function (alreadySelected, corner, e, target) {\n if (!corner || !alreadySelected) {\n return 'drag';\n }\n\n var control = target.controls[corner];\n return control.getActionName(e, control, target);\n },\n\n /**\n * @private\n * @param {Event} e Event object\n * @param {fabric.Object} target\n */\n _setupCurrentTransform: function (e, target, alreadySelected) {\n if (!target) {\n return;\n }\n\n var pointer = this.getPointer(e),\n corner = target.__corner,\n actionHandler = alreadySelected && corner ? target.controls[corner].getActionHandler() : fabric.controlsUtils.dragHandler,\n action = this._getActionFromCorner(alreadySelected, corner, e, target),\n origin = this._getOriginFromCorner(target, corner),\n altKey = e[this.centeredKey],\n transform = {\n target: target,\n action: action,\n actionHandler: actionHandler,\n corner: corner,\n scaleX: target.scaleX,\n scaleY: target.scaleY,\n skewX: target.skewX,\n skewY: target.skewY,\n // used by transation\n offsetX: pointer.x - target.left,\n offsetY: pointer.y - target.top,\n originX: origin.x,\n originY: origin.y,\n ex: pointer.x,\n ey: pointer.y,\n lastX: pointer.x,\n lastY: pointer.y,\n // unsure they are useful anymore.\n // left: target.left,\n // top: target.top,\n theta: degreesToRadians(target.angle),\n // end of unsure\n width: target.width * target.scaleX,\n shiftKey: e.shiftKey,\n altKey: altKey,\n original: fabric.util.saveObjectTransform(target)\n };\n\n if (this._shouldCenterTransform(target, action, altKey)) {\n transform.originX = 'center';\n transform.originY = 'center';\n }\n\n transform.original.originX = origin.x;\n transform.original.originY = origin.y;\n this._currentTransform = transform;\n\n this._beforeTransform(e);\n },\n\n /**\n * Set the cursor type of the canvas element\n * @param {String} value Cursor type of the canvas element.\n * @see http://www.w3.org/TR/css3-ui/#cursor\n */\n setCursor: function (value) {\n this.upperCanvasEl.style.cursor = value;\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx to draw the selection on\n */\n _drawSelection: function (ctx) {\n var groupSelector = this._groupSelector,\n left = groupSelector.left,\n top = groupSelector.top,\n aleft = abs(left),\n atop = abs(top);\n\n if (this.selectionColor) {\n ctx.fillStyle = this.selectionColor;\n ctx.fillRect(groupSelector.ex - (left > 0 ? 0 : -left), groupSelector.ey - (top > 0 ? 0 : -top), aleft, atop);\n }\n\n if (!this.selectionLineWidth || !this.selectionBorderColor) {\n return;\n }\n\n ctx.lineWidth = this.selectionLineWidth;\n ctx.strokeStyle = this.selectionBorderColor; // selection border\n\n if (this.selectionDashArray.length > 1 && !supportLineDash) {\n var px = groupSelector.ex + STROKE_OFFSET - (left > 0 ? 0 : aleft),\n py = groupSelector.ey + STROKE_OFFSET - (top > 0 ? 0 : atop);\n ctx.beginPath();\n fabric.util.drawDashedLine(ctx, px, py, px + aleft, py, this.selectionDashArray);\n fabric.util.drawDashedLine(ctx, px, py + atop - 1, px + aleft, py + atop - 1, this.selectionDashArray);\n fabric.util.drawDashedLine(ctx, px, py, px, py + atop, this.selectionDashArray);\n fabric.util.drawDashedLine(ctx, px + aleft - 1, py, px + aleft - 1, py + atop, this.selectionDashArray);\n ctx.closePath();\n ctx.stroke();\n } else {\n fabric.Object.prototype._setLineDash.call(this, ctx, this.selectionDashArray);\n\n ctx.strokeRect(groupSelector.ex + STROKE_OFFSET - (left > 0 ? 0 : aleft), groupSelector.ey + STROKE_OFFSET - (top > 0 ? 0 : atop), aleft, atop);\n }\n },\n\n /**\n * Method that determines what object we are clicking on\n * the skipGroup parameter is for internal use, is needed for shift+click action\n * 11/09/2018 TODO: would be cool if findTarget could discern between being a full target\n * or the outside part of the corner.\n * @param {Event} e mouse event\n * @param {Boolean} skipGroup when true, activeGroup is skipped and only objects are traversed through\n * @return {fabric.Object} the target found\n */\n findTarget: function (e, skipGroup) {\n if (this.skipTargetFind) {\n return;\n }\n\n var ignoreZoom = true,\n pointer = this.getPointer(e, ignoreZoom),\n activeObject = this._activeObject,\n aObjects = this.getActiveObjects(),\n activeTarget,\n activeTargetSubs,\n isTouch = isTouchEvent(e); // first check current group (if one exists)\n // active group does not check sub targets like normal groups.\n // if active group just exits.\n\n this.targets = [];\n\n if (aObjects.length > 1 && !skipGroup && activeObject === this._searchPossibleTargets([activeObject], pointer)) {\n return activeObject;\n } // if we hit the corner of an activeObject, let's return that.\n\n\n if (aObjects.length === 1 && activeObject._findTargetCorner(pointer, isTouch)) {\n return activeObject;\n }\n\n if (aObjects.length === 1 && activeObject === this._searchPossibleTargets([activeObject], pointer)) {\n if (!this.preserveObjectStacking) {\n return activeObject;\n } else {\n activeTarget = activeObject;\n activeTargetSubs = this.targets;\n this.targets = [];\n }\n }\n\n var target = this._searchPossibleTargets(this._objects, pointer);\n\n if (e[this.altSelectionKey] && target && activeTarget && target !== activeTarget) {\n target = activeTarget;\n this.targets = activeTargetSubs;\n }\n\n return target;\n },\n\n /**\n * Checks point is inside the object.\n * @param {Object} [pointer] x,y object of point coordinates we want to check.\n * @param {fabric.Object} obj Object to test against\n * @param {Object} [globalPointer] x,y object of point coordinates relative to canvas used to search per pixel target.\n * @return {Boolean} true if point is contained within an area of given object\n * @private\n */\n _checkTarget: function (pointer, obj, globalPointer) {\n if (obj && obj.visible && obj.evented && ( // http://www.geog.ubc.ca/courses/klink/gis.notes/ncgia/u32.html\n // http://idav.ucdavis.edu/~okreylos/TAship/Spring2000/PointInPolygon.html\n obj.containsPoint(pointer) || !!obj._findTargetCorner(pointer))) {\n if ((this.perPixelTargetFind || obj.perPixelTargetFind) && !obj.isEditing) {\n var isTransparent = this.isTargetTransparent(obj, globalPointer.x, globalPointer.y);\n\n if (!isTransparent) {\n return true;\n }\n } else {\n return true;\n }\n }\n },\n\n /**\n * Function used to search inside objects an object that contains pointer in bounding box or that contains pointerOnCanvas when painted\n * @param {Array} [objects] objects array to look into\n * @param {Object} [pointer] x,y object of point coordinates we want to check.\n * @return {fabric.Object} object that contains pointer\n * @private\n */\n _searchPossibleTargets: function (objects, pointer) {\n // Cache all targets where their bounding box contains point.\n var target,\n i = objects.length,\n subTarget; // Do not check for currently grouped objects, since we check the parent group itself.\n // until we call this function specifically to search inside the activeGroup\n\n while (i--) {\n var objToCheck = objects[i];\n var pointerToUse = objToCheck.group ? this._normalizePointer(objToCheck.group, pointer) : pointer;\n\n if (this._checkTarget(pointerToUse, objToCheck, pointer)) {\n target = objects[i];\n\n if (target.subTargetCheck && target instanceof fabric.Group) {\n subTarget = this._searchPossibleTargets(target._objects, pointer);\n subTarget && this.targets.push(subTarget);\n }\n\n break;\n }\n }\n\n return target;\n },\n\n /**\n * Returns pointer coordinates without the effect of the viewport\n * @param {Object} pointer with \"x\" and \"y\" number values\n * @return {Object} object with \"x\" and \"y\" number values\n */\n restorePointerVpt: function (pointer) {\n return fabric.util.transformPoint(pointer, fabric.util.invertTransform(this.viewportTransform));\n },\n\n /**\n * Returns pointer coordinates relative to canvas.\n * Can return coordinates with or without viewportTransform.\n * ignoreZoom false gives back coordinates that represent\n * the point clicked on canvas element.\n * ignoreZoom true gives back coordinates after being processed\n * by the viewportTransform ( sort of coordinates of what is displayed\n * on the canvas where you are clicking.\n * ignoreZoom true = HTMLElement coordinates relative to top,left\n * ignoreZoom false, default = fabric space coordinates, the same used for shape position\n * To interact with your shapes top and left you want to use ignoreZoom true\n * most of the time, while ignoreZoom false will give you coordinates\n * compatible with the object.oCoords system.\n * of the time.\n * @param {Event} e\n * @param {Boolean} ignoreZoom\n * @return {Object} object with \"x\" and \"y\" number values\n */\n getPointer: function (e, ignoreZoom) {\n // return cached values if we are in the event processing chain\n if (this._absolutePointer && !ignoreZoom) {\n return this._absolutePointer;\n }\n\n if (this._pointer && ignoreZoom) {\n return this._pointer;\n }\n\n var pointer = getPointer(e),\n upperCanvasEl = this.upperCanvasEl,\n bounds = upperCanvasEl.getBoundingClientRect(),\n boundsWidth = bounds.width || 0,\n boundsHeight = bounds.height || 0,\n cssScale;\n\n if (!boundsWidth || !boundsHeight) {\n if ('top' in bounds && 'bottom' in bounds) {\n boundsHeight = Math.abs(bounds.top - bounds.bottom);\n }\n\n if ('right' in bounds && 'left' in bounds) {\n boundsWidth = Math.abs(bounds.right - bounds.left);\n }\n }\n\n this.calcOffset();\n pointer.x = pointer.x - this._offset.left;\n pointer.y = pointer.y - this._offset.top;\n\n if (!ignoreZoom) {\n pointer = this.restorePointerVpt(pointer);\n }\n\n var retinaScaling = this.getRetinaScaling();\n\n if (retinaScaling !== 1) {\n pointer.x /= retinaScaling;\n pointer.y /= retinaScaling;\n }\n\n if (boundsWidth === 0 || boundsHeight === 0) {\n // If bounds are not available (i.e. not visible), do not apply scale.\n cssScale = {\n width: 1,\n height: 1\n };\n } else {\n cssScale = {\n width: upperCanvasEl.width / boundsWidth,\n height: upperCanvasEl.height / boundsHeight\n };\n }\n\n return {\n x: pointer.x * cssScale.width,\n y: pointer.y * cssScale.height\n };\n },\n\n /**\n * @private\n * @throws {CANVAS_INIT_ERROR} If canvas can not be initialized\n */\n _createUpperCanvas: function () {\n var lowerCanvasClass = this.lowerCanvasEl.className.replace(/\\s*lower-canvas\\s*/, ''),\n lowerCanvasEl = this.lowerCanvasEl,\n upperCanvasEl = this.upperCanvasEl; // there is no need to create a new upperCanvas element if we have already one.\n\n if (upperCanvasEl) {\n upperCanvasEl.className = '';\n } else {\n upperCanvasEl = this._createCanvasElement();\n this.upperCanvasEl = upperCanvasEl;\n }\n\n fabric.util.addClass(upperCanvasEl, 'upper-canvas ' + lowerCanvasClass);\n this.wrapperEl.appendChild(upperCanvasEl);\n\n this._copyCanvasStyle(lowerCanvasEl, upperCanvasEl);\n\n this._applyCanvasStyle(upperCanvasEl);\n\n this.contextTop = upperCanvasEl.getContext('2d');\n },\n\n /**\n * @private\n */\n _createCacheCanvas: function () {\n this.cacheCanvasEl = this._createCanvasElement();\n this.cacheCanvasEl.setAttribute('width', this.width);\n this.cacheCanvasEl.setAttribute('height', this.height);\n this.contextCache = this.cacheCanvasEl.getContext('2d');\n },\n\n /**\n * @private\n */\n _initWrapperElement: function () {\n this.wrapperEl = fabric.util.wrapElement(this.lowerCanvasEl, 'div', {\n 'class': this.containerClass\n });\n fabric.util.setStyle(this.wrapperEl, {\n width: this.width + 'px',\n height: this.height + 'px',\n position: 'relative'\n });\n fabric.util.makeElementUnselectable(this.wrapperEl);\n },\n\n /**\n * @private\n * @param {HTMLElement} element canvas element to apply styles on\n */\n _applyCanvasStyle: function (element) {\n var width = this.width || element.width,\n height = this.height || element.height;\n fabric.util.setStyle(element, {\n position: 'absolute',\n width: width + 'px',\n height: height + 'px',\n left: 0,\n top: 0,\n 'touch-action': this.allowTouchScrolling ? 'manipulation' : 'none',\n '-ms-touch-action': this.allowTouchScrolling ? 'manipulation' : 'none'\n });\n element.width = width;\n element.height = height;\n fabric.util.makeElementUnselectable(element);\n },\n\n /**\n * Copy the entire inline style from one element (fromEl) to another (toEl)\n * @private\n * @param {Element} fromEl Element style is copied from\n * @param {Element} toEl Element copied style is applied to\n */\n _copyCanvasStyle: function (fromEl, toEl) {\n toEl.style.cssText = fromEl.style.cssText;\n },\n\n /**\n * Returns context of canvas where object selection is drawn\n * @return {CanvasRenderingContext2D}\n */\n getSelectionContext: function () {\n return this.contextTop;\n },\n\n /**\n * Returns <canvas> element on which object selection is drawn\n * @return {HTMLCanvasElement}\n */\n getSelectionElement: function () {\n return this.upperCanvasEl;\n },\n\n /**\n * Returns currently active object\n * @return {fabric.Object} active object\n */\n getActiveObject: function () {\n return this._activeObject;\n },\n\n /**\n * Returns an array with the current selected objects\n * @return {fabric.Object} active object\n */\n getActiveObjects: function () {\n var active = this._activeObject;\n\n if (active) {\n if (active.type === 'activeSelection' && active._objects) {\n return active._objects.slice(0);\n } else {\n return [active];\n }\n }\n\n return [];\n },\n\n /**\n * @private\n * @param {fabric.Object} obj Object that was removed\n */\n _onObjectRemoved: function (obj) {\n // removing active object should fire \"selection:cleared\" events\n if (obj === this._activeObject) {\n this.fire('before:selection:cleared', {\n target: obj\n });\n\n this._discardActiveObject();\n\n this.fire('selection:cleared', {\n target: obj\n });\n obj.fire('deselected');\n }\n\n if (obj === this._hoveredTarget) {\n this._hoveredTarget = null;\n this._hoveredTargets = [];\n }\n\n this.callSuper('_onObjectRemoved', obj);\n },\n\n /**\n * @private\n * Compares the old activeObject with the current one and fires correct events\n * @param {fabric.Object} obj old activeObject\n */\n _fireSelectionEvents: function (oldObjects, e) {\n var somethingChanged = false,\n objects = this.getActiveObjects(),\n added = [],\n removed = [],\n opt = {\n e: e\n };\n oldObjects.forEach(function (oldObject) {\n if (objects.indexOf(oldObject) === -1) {\n somethingChanged = true;\n oldObject.fire('deselected', opt);\n removed.push(oldObject);\n }\n });\n objects.forEach(function (object) {\n if (oldObjects.indexOf(object) === -1) {\n somethingChanged = true;\n object.fire('selected', opt);\n added.push(object);\n }\n });\n\n if (oldObjects.length > 0 && objects.length > 0) {\n opt.selected = added;\n opt.deselected = removed; // added for backward compatibility\n\n opt.updated = added[0] || removed[0];\n opt.target = this._activeObject;\n somethingChanged && this.fire('selection:updated', opt);\n } else if (objects.length > 0) {\n opt.selected = added; // added for backward compatibility\n\n opt.target = this._activeObject;\n this.fire('selection:created', opt);\n } else if (oldObjects.length > 0) {\n opt.deselected = removed;\n this.fire('selection:cleared', opt);\n }\n },\n\n /**\n * Sets given object as the only active object on canvas\n * @param {fabric.Object} object Object to set as an active one\n * @param {Event} [e] Event (passed along when firing \"object:selected\")\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n setActiveObject: function (object, e) {\n var currentActives = this.getActiveObjects();\n\n this._setActiveObject(object, e);\n\n this._fireSelectionEvents(currentActives, e);\n\n return this;\n },\n\n /**\n * @private\n * @param {Object} object to set as active\n * @param {Event} [e] Event (passed along when firing \"object:selected\")\n * @return {Boolean} true if the selection happened\n */\n _setActiveObject: function (object, e) {\n if (this._activeObject === object) {\n return false;\n }\n\n if (!this._discardActiveObject(e, object)) {\n return false;\n }\n\n if (object.onSelect({\n e: e\n })) {\n return false;\n }\n\n this._activeObject = object;\n return true;\n },\n\n /**\n * @private\n */\n _discardActiveObject: function (e, object) {\n var obj = this._activeObject;\n\n if (obj) {\n // onDeselect return TRUE to cancel selection;\n if (obj.onDeselect({\n e: e,\n object: object\n })) {\n return false;\n }\n\n this._activeObject = null;\n }\n\n return true;\n },\n\n /**\n * Discards currently active object and fire events. If the function is called by fabric\n * as a consequence of a mouse event, the event is passed as a parameter and\n * sent to the fire function for the custom events. When used as a method the\n * e param does not have any application.\n * @param {event} e\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n discardActiveObject: function (e) {\n var currentActives = this.getActiveObjects(),\n activeObject = this.getActiveObject();\n\n if (currentActives.length) {\n this.fire('before:selection:cleared', {\n target: activeObject,\n e: e\n });\n }\n\n this._discardActiveObject(e);\n\n this._fireSelectionEvents(currentActives, e);\n\n return this;\n },\n\n /**\n * Clears a canvas element and removes all event listeners\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n dispose: function () {\n var wrapper = this.wrapperEl;\n this.removeListeners();\n wrapper.removeChild(this.upperCanvasEl);\n wrapper.removeChild(this.lowerCanvasEl);\n this.contextCache = null;\n this.contextTop = null;\n ['upperCanvasEl', 'cacheCanvasEl'].forEach(function (element) {\n fabric.util.cleanUpJsdomNode(this[element]);\n this[element] = undefined;\n }.bind(this));\n\n if (wrapper.parentNode) {\n wrapper.parentNode.replaceChild(this.lowerCanvasEl, this.wrapperEl);\n }\n\n delete this.wrapperEl;\n fabric.StaticCanvas.prototype.dispose.call(this);\n return this;\n },\n\n /**\n * Clears all contexts (background, main, top) of an instance\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n clear: function () {\n // this.discardActiveGroup();\n this.discardActiveObject();\n this.clearContext(this.contextTop);\n return this.callSuper('clear');\n },\n\n /**\n * Draws objects' controls (borders/controls)\n * @param {CanvasRenderingContext2D} ctx Context to render controls on\n */\n drawControls: function (ctx) {\n var activeObject = this._activeObject;\n\n if (activeObject) {\n activeObject._renderControls(ctx);\n }\n },\n\n /**\n * @private\n */\n _toObject: function (instance, methodName, propertiesToInclude) {\n //If the object is part of the current selection group, it should\n //be transformed appropriately\n //i.e. it should be serialised as it would appear if the selection group\n //were to be destroyed.\n var originalProperties = this._realizeGroupTransformOnObject(instance),\n object = this.callSuper('_toObject', instance, methodName, propertiesToInclude); //Undo the damage we did by changing all of its properties\n\n\n this._unwindGroupTransformOnObject(instance, originalProperties);\n\n return object;\n },\n\n /**\n * Realises an object's group transformation on it\n * @private\n * @param {fabric.Object} [instance] the object to transform (gets mutated)\n * @returns the original values of instance which were changed\n */\n _realizeGroupTransformOnObject: function (instance) {\n if (instance.group && instance.group.type === 'activeSelection' && this._activeObject === instance.group) {\n var layoutProps = ['angle', 'flipX', 'flipY', 'left', 'scaleX', 'scaleY', 'skewX', 'skewY', 'top']; //Copy all the positionally relevant properties across now\n\n var originalValues = {};\n layoutProps.forEach(function (prop) {\n originalValues[prop] = instance[prop];\n });\n\n this._activeObject.realizeTransform(instance);\n\n return originalValues;\n } else {\n return null;\n }\n },\n\n /**\n * Restores the changed properties of instance\n * @private\n * @param {fabric.Object} [instance] the object to un-transform (gets mutated)\n * @param {Object} [originalValues] the original values of instance, as returned by _realizeGroupTransformOnObject\n */\n _unwindGroupTransformOnObject: function (instance, originalValues) {\n if (originalValues) {\n instance.set(originalValues);\n }\n },\n\n /**\n * @private\n */\n _setSVGObject: function (markup, instance, reviver) {\n //If the object is in a selection group, simulate what would happen to that\n //object when the group is deselected\n var originalProperties = this._realizeGroupTransformOnObject(instance);\n\n this.callSuper('_setSVGObject', markup, instance, reviver);\n\n this._unwindGroupTransformOnObject(instance, originalProperties);\n },\n setViewportTransform: function (vpt) {\n if (this.renderOnAddRemove && this._activeObject && this._activeObject.isEditing) {\n this._activeObject.clearContextTop();\n }\n\n fabric.StaticCanvas.prototype.setViewportTransform.call(this, vpt);\n }\n }); // copying static properties manually to work around Opera's bug,\n // where \"prototype\" property is enumerable and overrides existing prototype\n\n for (var prop in fabric.StaticCanvas) {\n if (prop !== 'prototype') {\n fabric.Canvas[prop] = fabric.StaticCanvas[prop];\n }\n }\n})();\n\n(function () {\n var addListener = fabric.util.addListener,\n removeListener = fabric.util.removeListener,\n RIGHT_CLICK = 3,\n MIDDLE_CLICK = 2,\n LEFT_CLICK = 1,\n addEventOptions = {\n passive: false\n };\n\n function checkClick(e, value) {\n return e.button && e.button === value - 1;\n }\n\n fabric.util.object.extend(fabric.Canvas.prototype,\n /** @lends fabric.Canvas.prototype */\n {\n /**\n * Contains the id of the touch event that owns the fabric transform\n * @type Number\n * @private\n */\n mainTouchId: null,\n\n /**\n * Adds mouse listeners to canvas\n * @private\n */\n _initEventListeners: function () {\n // in case we initialized the class twice. This should not happen normally\n // but in some kind of applications where the canvas element may be changed\n // this is a workaround to having double listeners.\n this.removeListeners();\n\n this._bindEvents();\n\n this.addOrRemove(addListener, 'add');\n },\n\n /**\n * return an event prefix pointer or mouse.\n * @private\n */\n _getEventPrefix: function () {\n return this.enablePointerEvents ? 'pointer' : 'mouse';\n },\n addOrRemove: function (functor, eventjsFunctor) {\n var canvasElement = this.upperCanvasEl,\n eventTypePrefix = this._getEventPrefix();\n\n functor(fabric.window, 'resize', this._onResize);\n functor(canvasElement, eventTypePrefix + 'down', this._onMouseDown);\n functor(canvasElement, eventTypePrefix + 'move', this._onMouseMove, addEventOptions);\n functor(canvasElement, eventTypePrefix + 'out', this._onMouseOut);\n functor(canvasElement, eventTypePrefix + 'enter', this._onMouseEnter);\n functor(canvasElement, 'wheel', this._onMouseWheel);\n functor(canvasElement, 'contextmenu', this._onContextMenu);\n functor(canvasElement, 'dblclick', this._onDoubleClick);\n functor(canvasElement, 'dragover', this._onDragOver);\n functor(canvasElement, 'dragenter', this._onDragEnter);\n functor(canvasElement, 'dragleave', this._onDragLeave);\n functor(canvasElement, 'drop', this._onDrop);\n\n if (!this.enablePointerEvents) {\n functor(canvasElement, 'touchstart', this._onTouchStart, addEventOptions);\n }\n\n if (typeof eventjs !== 'undefined' && eventjsFunctor in eventjs) {\n eventjs[eventjsFunctor](canvasElement, 'gesture', this._onGesture);\n eventjs[eventjsFunctor](canvasElement, 'drag', this._onDrag);\n eventjs[eventjsFunctor](canvasElement, 'orientation', this._onOrientationChange);\n eventjs[eventjsFunctor](canvasElement, 'shake', this._onShake);\n eventjs[eventjsFunctor](canvasElement, 'longpress', this._onLongPress);\n }\n },\n\n /**\n * Removes all event listeners\n */\n removeListeners: function () {\n this.addOrRemove(removeListener, 'remove'); // if you dispose on a mouseDown, before mouse up, you need to clean document to...\n\n var eventTypePrefix = this._getEventPrefix();\n\n removeListener(fabric.document, eventTypePrefix + 'up', this._onMouseUp);\n removeListener(fabric.document, 'touchend', this._onTouchEnd, addEventOptions);\n removeListener(fabric.document, eventTypePrefix + 'move', this._onMouseMove, addEventOptions);\n removeListener(fabric.document, 'touchmove', this._onMouseMove, addEventOptions);\n },\n\n /**\n * @private\n */\n _bindEvents: function () {\n if (this.eventsBound) {\n // for any reason we pass here twice we do not want to bind events twice.\n return;\n }\n\n this._onMouseDown = this._onMouseDown.bind(this);\n this._onTouchStart = this._onTouchStart.bind(this);\n this._onMouseMove = this._onMouseMove.bind(this);\n this._onMouseUp = this._onMouseUp.bind(this);\n this._onTouchEnd = this._onTouchEnd.bind(this);\n this._onResize = this._onResize.bind(this);\n this._onGesture = this._onGesture.bind(this);\n this._onDrag = this._onDrag.bind(this);\n this._onShake = this._onShake.bind(this);\n this._onLongPress = this._onLongPress.bind(this);\n this._onOrientationChange = this._onOrientationChange.bind(this);\n this._onMouseWheel = this._onMouseWheel.bind(this);\n this._onMouseOut = this._onMouseOut.bind(this);\n this._onMouseEnter = this._onMouseEnter.bind(this);\n this._onContextMenu = this._onContextMenu.bind(this);\n this._onDoubleClick = this._onDoubleClick.bind(this);\n this._onDragOver = this._onDragOver.bind(this);\n this._onDragEnter = this._simpleEventHandler.bind(this, 'dragenter');\n this._onDragLeave = this._simpleEventHandler.bind(this, 'dragleave');\n this._onDrop = this._simpleEventHandler.bind(this, 'drop');\n this.eventsBound = true;\n },\n\n /**\n * @private\n * @param {Event} [e] Event object fired on Event.js gesture\n * @param {Event} [self] Inner Event object\n */\n _onGesture: function (e, self) {\n this.__onTransformGesture && this.__onTransformGesture(e, self);\n },\n\n /**\n * @private\n * @param {Event} [e] Event object fired on Event.js drag\n * @param {Event} [self] Inner Event object\n */\n _onDrag: function (e, self) {\n this.__onDrag && this.__onDrag(e, self);\n },\n\n /**\n * @private\n * @param {Event} [e] Event object fired on wheel event\n */\n _onMouseWheel: function (e) {\n this.__onMouseWheel(e);\n },\n\n /**\n * @private\n * @param {Event} e Event object fired on mousedown\n */\n _onMouseOut: function (e) {\n var target = this._hoveredTarget;\n this.fire('mouse:out', {\n target: target,\n e: e\n });\n this._hoveredTarget = null;\n target && target.fire('mouseout', {\n e: e\n });\n\n var _this = this;\n\n this._hoveredTargets.forEach(function (_target) {\n _this.fire('mouse:out', {\n target: target,\n e: e\n });\n\n _target && target.fire('mouseout', {\n e: e\n });\n });\n\n this._hoveredTargets = [];\n\n if (this._iTextInstances) {\n this._iTextInstances.forEach(function (obj) {\n if (obj.isEditing) {\n obj.hiddenTextarea.focus();\n }\n });\n }\n },\n\n /**\n * @private\n * @param {Event} e Event object fired on mouseenter\n */\n _onMouseEnter: function (e) {\n // This find target and consequent 'mouse:over' is used to\n // clear old instances on hovered target.\n // calling findTarget has the side effect of killing target.__corner.\n // as a short term fix we are not firing this if we are currently transforming.\n // as a long term fix we need to separate the action of finding a target with the\n // side effects we added to it.\n if (!this._currentTransform && !this.findTarget(e)) {\n this.fire('mouse:over', {\n target: null,\n e: e\n });\n this._hoveredTarget = null;\n this._hoveredTargets = [];\n }\n },\n\n /**\n * @private\n * @param {Event} [e] Event object fired on Event.js orientation change\n * @param {Event} [self] Inner Event object\n */\n _onOrientationChange: function (e, self) {\n this.__onOrientationChange && this.__onOrientationChange(e, self);\n },\n\n /**\n * @private\n * @param {Event} [e] Event object fired on Event.js shake\n * @param {Event} [self] Inner Event object\n */\n _onShake: function (e, self) {\n this.__onShake && this.__onShake(e, self);\n },\n\n /**\n * @private\n * @param {Event} [e] Event object fired on Event.js shake\n * @param {Event} [self] Inner Event object\n */\n _onLongPress: function (e, self) {\n this.__onLongPress && this.__onLongPress(e, self);\n },\n\n /**\n * prevent default to allow drop event to be fired\n * @private\n * @param {Event} [e] Event object fired on Event.js shake\n */\n _onDragOver: function (e) {\n e.preventDefault();\n\n var target = this._simpleEventHandler('dragover', e);\n\n this._fireEnterLeaveEvents(target, e);\n },\n\n /**\n * @private\n * @param {Event} e Event object fired on mousedown\n */\n _onContextMenu: function (e) {\n if (this.stopContextMenu) {\n e.stopPropagation();\n e.preventDefault();\n }\n\n return false;\n },\n\n /**\n * @private\n * @param {Event} e Event object fired on mousedown\n */\n _onDoubleClick: function (e) {\n this._cacheTransformEventData(e);\n\n this._handleEvent(e, 'dblclick');\n\n this._resetTransformEventData(e);\n },\n\n /**\n * Return a the id of an event.\n * returns either the pointerId or the identifier or 0 for the mouse event\n * @private\n * @param {Event} evt Event object\n */\n getPointerId: function (evt) {\n var changedTouches = evt.changedTouches;\n\n if (changedTouches) {\n return changedTouches[0] && changedTouches[0].identifier;\n }\n\n if (this.enablePointerEvents) {\n return evt.pointerId;\n }\n\n return -1;\n },\n\n /**\n * Determines if an event has the id of the event that is considered main\n * @private\n * @param {evt} event Event object\n */\n _isMainEvent: function (evt) {\n if (evt.isPrimary === true) {\n return true;\n }\n\n if (evt.isPrimary === false) {\n return false;\n }\n\n if (evt.type === 'touchend' && evt.touches.length === 0) {\n return true;\n }\n\n if (evt.changedTouches) {\n return evt.changedTouches[0].identifier === this.mainTouchId;\n }\n\n return true;\n },\n\n /**\n * @private\n * @param {Event} e Event object fired on mousedown\n */\n _onTouchStart: function (e) {\n e.preventDefault();\n\n if (this.mainTouchId === null) {\n this.mainTouchId = this.getPointerId(e);\n }\n\n this.__onMouseDown(e);\n\n this._resetTransformEventData();\n\n var canvasElement = this.upperCanvasEl,\n eventTypePrefix = this._getEventPrefix();\n\n addListener(fabric.document, 'touchend', this._onTouchEnd, addEventOptions);\n addListener(fabric.document, 'touchmove', this._onMouseMove, addEventOptions); // Unbind mousedown to prevent double triggers from touch devices\n\n removeListener(canvasElement, eventTypePrefix + 'down', this._onMouseDown);\n },\n\n /**\n * @private\n * @param {Event} e Event object fired on mousedown\n */\n _onMouseDown: function (e) {\n this.__onMouseDown(e);\n\n this._resetTransformEventData();\n\n var canvasElement = this.upperCanvasEl,\n eventTypePrefix = this._getEventPrefix();\n\n removeListener(canvasElement, eventTypePrefix + 'move', this._onMouseMove, addEventOptions);\n addListener(fabric.document, eventTypePrefix + 'up', this._onMouseUp);\n addListener(fabric.document, eventTypePrefix + 'move', this._onMouseMove, addEventOptions);\n },\n\n /**\n * @private\n * @param {Event} e Event object fired on mousedown\n */\n _onTouchEnd: function (e) {\n if (e.touches.length > 0) {\n // if there are still touches stop here\n return;\n }\n\n this.__onMouseUp(e);\n\n this._resetTransformEventData();\n\n this.mainTouchId = null;\n\n var eventTypePrefix = this._getEventPrefix();\n\n removeListener(fabric.document, 'touchend', this._onTouchEnd, addEventOptions);\n removeListener(fabric.document, 'touchmove', this._onMouseMove, addEventOptions);\n\n var _this = this;\n\n if (this._willAddMouseDown) {\n clearTimeout(this._willAddMouseDown);\n }\n\n this._willAddMouseDown = setTimeout(function () {\n // Wait 400ms before rebinding mousedown to prevent double triggers\n // from touch devices\n addListener(_this.upperCanvasEl, eventTypePrefix + 'down', _this._onMouseDown);\n _this._willAddMouseDown = 0;\n }, 400);\n },\n\n /**\n * @private\n * @param {Event} e Event object fired on mouseup\n */\n _onMouseUp: function (e) {\n this.__onMouseUp(e);\n\n this._resetTransformEventData();\n\n var canvasElement = this.upperCanvasEl,\n eventTypePrefix = this._getEventPrefix();\n\n if (this._isMainEvent(e)) {\n removeListener(fabric.document, eventTypePrefix + 'up', this._onMouseUp);\n removeListener(fabric.document, eventTypePrefix + 'move', this._onMouseMove, addEventOptions);\n addListener(canvasElement, eventTypePrefix + 'move', this._onMouseMove, addEventOptions);\n }\n },\n\n /**\n * @private\n * @param {Event} e Event object fired on mousemove\n */\n _onMouseMove: function (e) {\n !this.allowTouchScrolling && e.preventDefault && e.preventDefault();\n\n this.__onMouseMove(e);\n },\n\n /**\n * @private\n */\n _onResize: function () {\n this.calcOffset();\n },\n\n /**\n * Decides whether the canvas should be redrawn in mouseup and mousedown events.\n * @private\n * @param {Object} target\n */\n _shouldRender: function (target) {\n var activeObject = this._activeObject;\n\n if (!!activeObject !== !!target || activeObject && target && activeObject !== target) {\n // this covers: switch of target, from target to no target, selection of target\n // multiSelection with key and mouse\n return true;\n } else if (activeObject && activeObject.isEditing) {\n // if we mouse up/down over a editing textbox a cursor change,\n // there is no need to re render\n return false;\n }\n\n return false;\n },\n\n /**\n * Method that defines the actions when mouse is released on canvas.\n * The method resets the currentTransform parameters, store the image corner\n * position in the image object and render the canvas on top.\n * @private\n * @param {Event} e Event object fired on mouseup\n */\n __onMouseUp: function (e) {\n var target,\n transform = this._currentTransform,\n groupSelector = this._groupSelector,\n shouldRender = false,\n isClick = !groupSelector || groupSelector.left === 0 && groupSelector.top === 0;\n\n this._cacheTransformEventData(e);\n\n target = this._target;\n\n this._handleEvent(e, 'up:before'); // if right/middle click just fire events and return\n // target undefined will make the _handleEvent search the target\n\n\n if (checkClick(e, RIGHT_CLICK)) {\n if (this.fireRightClick) {\n this._handleEvent(e, 'up', RIGHT_CLICK, isClick);\n }\n\n return;\n }\n\n if (checkClick(e, MIDDLE_CLICK)) {\n if (this.fireMiddleClick) {\n this._handleEvent(e, 'up', MIDDLE_CLICK, isClick);\n }\n\n this._resetTransformEventData();\n\n return;\n }\n\n if (this.isDrawingMode && this._isCurrentlyDrawing) {\n this._onMouseUpInDrawingMode(e);\n\n return;\n }\n\n if (!this._isMainEvent(e)) {\n return;\n }\n\n if (transform) {\n this._finalizeCurrentTransform(e);\n\n shouldRender = transform.actionPerformed;\n }\n\n if (!isClick) {\n var targetWasActive = target === this._activeObject;\n\n this._maybeGroupObjects(e);\n\n if (!shouldRender) {\n shouldRender = this._shouldRender(target) || !targetWasActive && target === this._activeObject;\n }\n }\n\n if (target) {\n var corner = target._findTargetCorner(this.getPointer(e, true), fabric.util.isTouchEvent(e));\n\n var control = target.controls[corner],\n mouseUpHandler = control && control.getMouseUpHandler(e, target, control);\n\n if (mouseUpHandler) {\n mouseUpHandler(e, target, control);\n }\n\n target.isMoving = false;\n }\n\n this._setCursorFromEvent(e, target);\n\n this._handleEvent(e, 'up', LEFT_CLICK, isClick);\n\n this._groupSelector = null;\n this._currentTransform = null; // reset the target information about which corner is selected\n\n target && (target.__corner = 0);\n\n if (shouldRender) {\n this.requestRenderAll();\n } else if (!isClick) {\n this.renderTop();\n }\n },\n\n /**\n * @private\n * Handle event firing for target and subtargets\n * @param {Event} e event from mouse\n * @param {String} eventType event to fire (up, down or move)\n * @return {Fabric.Object} target return the the target found, for internal reasons.\n */\n _simpleEventHandler: function (eventType, e) {\n var target = this.findTarget(e),\n targets = this.targets,\n options = {\n e: e,\n target: target,\n subTargets: targets\n };\n this.fire(eventType, options);\n target && target.fire(eventType, options);\n\n if (!targets) {\n return target;\n }\n\n for (var i = 0; i < targets.length; i++) {\n targets[i].fire(eventType, options);\n }\n\n return target;\n },\n\n /**\n * @private\n * Handle event firing for target and subtargets\n * @param {Event} e event from mouse\n * @param {String} eventType event to fire (up, down or move)\n * @param {fabric.Object} targetObj receiving event\n * @param {Number} [button] button used in the event 1 = left, 2 = middle, 3 = right\n * @param {Boolean} isClick for left button only, indicates that the mouse up happened without move.\n */\n _handleEvent: function (e, eventType, button, isClick) {\n var target = this._target,\n targets = this.targets || [],\n options = {\n e: e,\n target: target,\n subTargets: targets,\n button: button || LEFT_CLICK,\n isClick: isClick || false,\n pointer: this._pointer,\n absolutePointer: this._absolutePointer,\n transform: this._currentTransform\n };\n\n if (eventType === 'up') {\n options.currentTarget = this.findTarget(e);\n options.currentSubTargets = this.targets;\n }\n\n this.fire('mouse:' + eventType, options);\n target && target.fire('mouse' + eventType, options);\n\n for (var i = 0; i < targets.length; i++) {\n targets[i].fire('mouse' + eventType, options);\n }\n },\n\n /**\n * @private\n * @param {Event} e send the mouse event that generate the finalize down, so it can be used in the event\n */\n _finalizeCurrentTransform: function (e) {\n var transform = this._currentTransform,\n target = transform.target,\n eventName,\n options = {\n e: e,\n target: target,\n transform: transform,\n action: transform.action\n };\n\n if (target._scaling) {\n target._scaling = false;\n }\n\n target.setCoords();\n\n if (transform.actionPerformed || this.stateful && target.hasStateChanged()) {\n if (transform.actionPerformed) {\n // this is not friendly to the new control api.\n // is deprecated.\n eventName = this._addEventOptions(options, transform);\n\n this._fire(eventName, options);\n }\n\n this._fire('modified', options);\n }\n },\n\n /**\n * Mutate option object in order to add by property and give back the event name.\n * @private\n * @deprecated since 4.2.0\n * @param {Object} options to mutate\n * @param {Object} transform to inspect action from\n */\n _addEventOptions: function (options, transform) {\n // we can probably add more details at low cost\n // scale change, rotation changes, translation changes\n var eventName, by;\n\n switch (transform.action) {\n case 'scaleX':\n eventName = 'scaled';\n by = 'x';\n break;\n\n case 'scaleY':\n eventName = 'scaled';\n by = 'y';\n break;\n\n case 'skewX':\n eventName = 'skewed';\n by = 'x';\n break;\n\n case 'skewY':\n eventName = 'skewed';\n by = 'y';\n break;\n\n case 'scale':\n eventName = 'scaled';\n by = 'equally';\n break;\n\n case 'rotate':\n eventName = 'rotated';\n break;\n\n case 'drag':\n eventName = 'moved';\n break;\n }\n\n options.by = by;\n return eventName;\n },\n\n /**\n * @private\n * @param {Event} e Event object fired on mousedown\n */\n _onMouseDownInDrawingMode: function (e) {\n this._isCurrentlyDrawing = true;\n\n if (this.getActiveObject()) {\n this.discardActiveObject(e).requestRenderAll();\n }\n\n var pointer = this.getPointer(e);\n this.freeDrawingBrush.onMouseDown(pointer, {\n e: e,\n pointer: pointer\n });\n\n this._handleEvent(e, 'down');\n },\n\n /**\n * @private\n * @param {Event} e Event object fired on mousemove\n */\n _onMouseMoveInDrawingMode: function (e) {\n if (this._isCurrentlyDrawing) {\n var pointer = this.getPointer(e);\n this.freeDrawingBrush.onMouseMove(pointer, {\n e: e,\n pointer: pointer\n });\n }\n\n this.setCursor(this.freeDrawingCursor);\n\n this._handleEvent(e, 'move');\n },\n\n /**\n * @private\n * @param {Event} e Event object fired on mouseup\n */\n _onMouseUpInDrawingMode: function (e) {\n var pointer = this.getPointer(e);\n this._isCurrentlyDrawing = this.freeDrawingBrush.onMouseUp({\n e: e,\n pointer: pointer\n });\n\n this._handleEvent(e, 'up');\n },\n\n /**\n * Method that defines the actions when mouse is clicked on canvas.\n * The method inits the currentTransform parameters and renders all the\n * canvas so the current image can be placed on the top canvas and the rest\n * in on the container one.\n * @private\n * @param {Event} e Event object fired on mousedown\n */\n __onMouseDown: function (e) {\n this._cacheTransformEventData(e);\n\n this._handleEvent(e, 'down:before');\n\n var target = this._target; // if right click just fire events\n\n if (checkClick(e, RIGHT_CLICK)) {\n if (this.fireRightClick) {\n this._handleEvent(e, 'down', RIGHT_CLICK);\n }\n\n return;\n }\n\n if (checkClick(e, MIDDLE_CLICK)) {\n if (this.fireMiddleClick) {\n this._handleEvent(e, 'down', MIDDLE_CLICK);\n }\n\n return;\n }\n\n if (this.isDrawingMode) {\n this._onMouseDownInDrawingMode(e);\n\n return;\n }\n\n if (!this._isMainEvent(e)) {\n return;\n } // ignore if some object is being transformed at this moment\n\n\n if (this._currentTransform) {\n return;\n }\n\n var pointer = this._pointer; // save pointer for check in __onMouseUp event\n\n this._previousPointer = pointer;\n\n var shouldRender = this._shouldRender(target),\n shouldGroup = this._shouldGroup(e, target);\n\n if (this._shouldClearSelection(e, target)) {\n this.discardActiveObject(e);\n } else if (shouldGroup) {\n this._handleGrouping(e, target);\n\n target = this._activeObject;\n }\n\n if (this.selection && (!target || !target.selectable && !target.isEditing && target !== this._activeObject)) {\n this._groupSelector = {\n ex: pointer.x,\n ey: pointer.y,\n top: 0,\n left: 0\n };\n }\n\n if (target) {\n var alreadySelected = target === this._activeObject;\n\n if (target.selectable) {\n this.setActiveObject(target, e);\n }\n\n var corner = target._findTargetCorner(this.getPointer(e, true), fabric.util.isTouchEvent(e));\n\n target.__corner = corner;\n\n if (target === this._activeObject && (corner || !shouldGroup)) {\n var control = target.controls[corner],\n mouseDownHandler = control && control.getMouseDownHandler(e, target, control);\n\n if (mouseDownHandler) {\n mouseDownHandler(e, target, control);\n }\n\n this._setupCurrentTransform(e, target, alreadySelected);\n }\n }\n\n this._handleEvent(e, 'down'); // we must renderAll so that we update the visuals\n\n\n (shouldRender || shouldGroup) && this.requestRenderAll();\n },\n\n /**\n * reset cache form common information needed during event processing\n * @private\n */\n _resetTransformEventData: function () {\n this._target = null;\n this._pointer = null;\n this._absolutePointer = null;\n },\n\n /**\n * Cache common information needed during event processing\n * @private\n * @param {Event} e Event object fired on event\n */\n _cacheTransformEventData: function (e) {\n // reset in order to avoid stale caching\n this._resetTransformEventData();\n\n this._pointer = this.getPointer(e, true);\n this._absolutePointer = this.restorePointerVpt(this._pointer);\n this._target = this._currentTransform ? this._currentTransform.target : this.findTarget(e) || null;\n },\n\n /**\n * @private\n */\n _beforeTransform: function (e) {\n var t = this._currentTransform;\n this.stateful && t.target.saveState();\n this.fire('before:transform', {\n e: e,\n transform: t\n });\n },\n\n /**\n * Method that defines the actions when mouse is hovering the canvas.\n * The currentTransform parameter will define whether the user is rotating/scaling/translating\n * an image or neither of them (only hovering). A group selection is also possible and would cancel\n * all any other type of action.\n * In case of an image transformation only the top canvas will be rendered.\n * @private\n * @param {Event} e Event object fired on mousemove\n */\n __onMouseMove: function (e) {\n this._handleEvent(e, 'move:before');\n\n this._cacheTransformEventData(e);\n\n var target, pointer;\n\n if (this.isDrawingMode) {\n this._onMouseMoveInDrawingMode(e);\n\n return;\n }\n\n if (!this._isMainEvent(e)) {\n return;\n }\n\n var groupSelector = this._groupSelector; // We initially clicked in an empty area, so we draw a box for multiple selection\n\n if (groupSelector) {\n pointer = this._pointer;\n groupSelector.left = pointer.x - groupSelector.ex;\n groupSelector.top = pointer.y - groupSelector.ey;\n this.renderTop();\n } else if (!this._currentTransform) {\n target = this.findTarget(e) || null;\n\n this._setCursorFromEvent(e, target);\n\n this._fireOverOutEvents(target, e);\n } else {\n this._transformObject(e);\n }\n\n this._handleEvent(e, 'move');\n\n this._resetTransformEventData();\n },\n\n /**\n * Manage the mouseout, mouseover events for the fabric object on the canvas\n * @param {Fabric.Object} target the target where the target from the mousemove event\n * @param {Event} e Event object fired on mousemove\n * @private\n */\n _fireOverOutEvents: function (target, e) {\n var _hoveredTarget = this._hoveredTarget,\n _hoveredTargets = this._hoveredTargets,\n targets = this.targets,\n length = Math.max(_hoveredTargets.length, targets.length);\n this.fireSyntheticInOutEvents(target, e, {\n oldTarget: _hoveredTarget,\n evtOut: 'mouseout',\n canvasEvtOut: 'mouse:out',\n evtIn: 'mouseover',\n canvasEvtIn: 'mouse:over'\n });\n\n for (var i = 0; i < length; i++) {\n this.fireSyntheticInOutEvents(targets[i], e, {\n oldTarget: _hoveredTargets[i],\n evtOut: 'mouseout',\n evtIn: 'mouseover'\n });\n }\n\n this._hoveredTarget = target;\n this._hoveredTargets = this.targets.concat();\n },\n\n /**\n * Manage the dragEnter, dragLeave events for the fabric objects on the canvas\n * @param {Fabric.Object} target the target where the target from the onDrag event\n * @param {Event} e Event object fired on ondrag\n * @private\n */\n _fireEnterLeaveEvents: function (target, e) {\n var _draggedoverTarget = this._draggedoverTarget,\n _hoveredTargets = this._hoveredTargets,\n targets = this.targets,\n length = Math.max(_hoveredTargets.length, targets.length);\n this.fireSyntheticInOutEvents(target, e, {\n oldTarget: _draggedoverTarget,\n evtOut: 'dragleave',\n evtIn: 'dragenter'\n });\n\n for (var i = 0; i < length; i++) {\n this.fireSyntheticInOutEvents(targets[i], e, {\n oldTarget: _hoveredTargets[i],\n evtOut: 'dragleave',\n evtIn: 'dragenter'\n });\n }\n\n this._draggedoverTarget = target;\n },\n\n /**\n * Manage the synthetic in/out events for the fabric objects on the canvas\n * @param {Fabric.Object} target the target where the target from the supported events\n * @param {Event} e Event object fired\n * @param {Object} config configuration for the function to work\n * @param {String} config.targetName property on the canvas where the old target is stored\n * @param {String} [config.canvasEvtOut] name of the event to fire at canvas level for out\n * @param {String} config.evtOut name of the event to fire for out\n * @param {String} [config.canvasEvtIn] name of the event to fire at canvas level for in\n * @param {String} config.evtIn name of the event to fire for in\n * @private\n */\n fireSyntheticInOutEvents: function (target, e, config) {\n var inOpt,\n outOpt,\n oldTarget = config.oldTarget,\n outFires,\n inFires,\n targetChanged = oldTarget !== target,\n canvasEvtIn = config.canvasEvtIn,\n canvasEvtOut = config.canvasEvtOut;\n\n if (targetChanged) {\n inOpt = {\n e: e,\n target: target,\n previousTarget: oldTarget\n };\n outOpt = {\n e: e,\n target: oldTarget,\n nextTarget: target\n };\n }\n\n inFires = target && targetChanged;\n outFires = oldTarget && targetChanged;\n\n if (outFires) {\n canvasEvtOut && this.fire(canvasEvtOut, outOpt);\n oldTarget.fire(config.evtOut, outOpt);\n }\n\n if (inFires) {\n canvasEvtIn && this.fire(canvasEvtIn, inOpt);\n target.fire(config.evtIn, inOpt);\n }\n },\n\n /**\n * Method that defines actions when an Event Mouse Wheel\n * @param {Event} e Event object fired on mouseup\n */\n __onMouseWheel: function (e) {\n this._cacheTransformEventData(e);\n\n this._handleEvent(e, 'wheel');\n\n this._resetTransformEventData();\n },\n\n /**\n * @private\n * @param {Event} e Event fired on mousemove\n */\n _transformObject: function (e) {\n var pointer = this.getPointer(e),\n transform = this._currentTransform;\n transform.reset = false;\n transform.target.isMoving = true;\n transform.shiftKey = e.shiftKey;\n transform.altKey = e[this.centeredKey];\n\n this._performTransformAction(e, transform, pointer);\n\n transform.actionPerformed && this.requestRenderAll();\n },\n\n /**\n * @private\n */\n _performTransformAction: function (e, transform, pointer) {\n var x = pointer.x,\n y = pointer.y,\n action = transform.action,\n actionPerformed = false,\n actionHandler = transform.actionHandler; // this object could be created from the function in the control handlers\n\n if (actionHandler) {\n actionPerformed = actionHandler(e, transform, x, y);\n }\n\n if (action === 'drag' && actionPerformed) {\n this.setCursor(transform.target.moveCursor || this.moveCursor);\n }\n\n transform.actionPerformed = transform.actionPerformed || actionPerformed;\n },\n\n /**\n * @private\n */\n _fire: fabric.controlsUtils.fireEvent,\n\n /**\n * Sets the cursor depending on where the canvas is being hovered.\n * Note: very buggy in Opera\n * @param {Event} e Event object\n * @param {Object} target Object that the mouse is hovering, if so.\n */\n _setCursorFromEvent: function (e, target) {\n if (!target) {\n this.setCursor(this.defaultCursor);\n return false;\n }\n\n var hoverCursor = target.hoverCursor || this.hoverCursor,\n activeSelection = this._activeObject && this._activeObject.type === 'activeSelection' ? this._activeObject : null,\n // only show proper corner when group selection is not active\n corner = (!activeSelection || !activeSelection.contains(target)) && // here we call findTargetCorner always with undefined for the touch parameter.\n // we assume that if you are using a cursor you do not need to interact with\n // the bigger touch area.\n target._findTargetCorner(this.getPointer(e, true));\n\n if (!corner) {\n if (target.subTargetCheck) {\n // hoverCursor should come from top-most subTarget,\n // so we walk the array backwards\n this.targets.concat().reverse().map(function (_target) {\n hoverCursor = _target.hoverCursor || hoverCursor;\n });\n }\n\n this.setCursor(hoverCursor);\n } else {\n this.setCursor(this.getCornerCursor(corner, target, e));\n }\n },\n\n /**\n * @private\n */\n getCornerCursor: function (corner, target, e) {\n var control = target.controls[corner];\n return control.cursorStyleHandler(e, control, target);\n }\n });\n})();\n\n(function () {\n var min = Math.min,\n max = Math.max;\n fabric.util.object.extend(fabric.Canvas.prototype,\n /** @lends fabric.Canvas.prototype */\n {\n /**\n * @private\n * @param {Event} e Event object\n * @param {fabric.Object} target\n * @return {Boolean}\n */\n _shouldGroup: function (e, target) {\n var activeObject = this._activeObject;\n return activeObject && this._isSelectionKeyPressed(e) && target && target.selectable && this.selection && (activeObject !== target || activeObject.type === 'activeSelection') && !target.onSelect({\n e: e\n });\n },\n\n /**\n * @private\n * @param {Event} e Event object\n * @param {fabric.Object} target\n */\n _handleGrouping: function (e, target) {\n var activeObject = this._activeObject; // avoid multi select when shift click on a corner\n\n if (activeObject.__corner) {\n return;\n }\n\n if (target === activeObject) {\n // if it's a group, find target again, using activeGroup objects\n target = this.findTarget(e, true); // if even object is not found or we are on activeObjectCorner, bail out\n\n if (!target || !target.selectable) {\n return;\n }\n }\n\n if (activeObject && activeObject.type === 'activeSelection') {\n this._updateActiveSelection(target, e);\n } else {\n this._createActiveSelection(target, e);\n }\n },\n\n /**\n * @private\n */\n _updateActiveSelection: function (target, e) {\n var activeSelection = this._activeObject,\n currentActiveObjects = activeSelection._objects.slice(0);\n\n if (activeSelection.contains(target)) {\n activeSelection.removeWithUpdate(target);\n this._hoveredTarget = target;\n this._hoveredTargets = this.targets.concat();\n\n if (activeSelection.size() === 1) {\n // activate last remaining object\n this._setActiveObject(activeSelection.item(0), e);\n }\n } else {\n activeSelection.addWithUpdate(target);\n this._hoveredTarget = activeSelection;\n this._hoveredTargets = this.targets.concat();\n }\n\n this._fireSelectionEvents(currentActiveObjects, e);\n },\n\n /**\n * @private\n */\n _createActiveSelection: function (target, e) {\n var currentActives = this.getActiveObjects(),\n group = this._createGroup(target);\n\n this._hoveredTarget = group; // ISSUE 4115: should we consider subTargets here?\n // this._hoveredTargets = [];\n // this._hoveredTargets = this.targets.concat();\n\n this._setActiveObject(group, e);\n\n this._fireSelectionEvents(currentActives, e);\n },\n\n /**\n * @private\n * @param {Object} target\n */\n _createGroup: function (target) {\n var objects = this._objects,\n isActiveLower = objects.indexOf(this._activeObject) < objects.indexOf(target),\n groupObjects = isActiveLower ? [this._activeObject, target] : [target, this._activeObject];\n this._activeObject.isEditing && this._activeObject.exitEditing();\n return new fabric.ActiveSelection(groupObjects, {\n canvas: this\n });\n },\n\n /**\n * @private\n * @param {Event} e mouse event\n */\n _groupSelectedObjects: function (e) {\n var group = this._collectObjects(e),\n aGroup; // do not create group for 1 element only\n\n\n if (group.length === 1) {\n this.setActiveObject(group[0], e);\n } else if (group.length > 1) {\n aGroup = new fabric.ActiveSelection(group.reverse(), {\n canvas: this\n });\n this.setActiveObject(aGroup, e);\n }\n },\n\n /**\n * @private\n */\n _collectObjects: function (e) {\n var group = [],\n currentObject,\n x1 = this._groupSelector.ex,\n y1 = this._groupSelector.ey,\n x2 = x1 + this._groupSelector.left,\n y2 = y1 + this._groupSelector.top,\n selectionX1Y1 = new fabric.Point(min(x1, x2), min(y1, y2)),\n selectionX2Y2 = new fabric.Point(max(x1, x2), max(y1, y2)),\n allowIntersect = !this.selectionFullyContained,\n isClick = x1 === x2 && y1 === y2; // we iterate reverse order to collect top first in case of click.\n\n for (var i = this._objects.length; i--;) {\n currentObject = this._objects[i];\n\n if (!currentObject || !currentObject.selectable || !currentObject.visible) {\n continue;\n }\n\n if (allowIntersect && currentObject.intersectsWithRect(selectionX1Y1, selectionX2Y2) || currentObject.isContainedWithinRect(selectionX1Y1, selectionX2Y2) || allowIntersect && currentObject.containsPoint(selectionX1Y1) || allowIntersect && currentObject.containsPoint(selectionX2Y2)) {\n group.push(currentObject); // only add one object if it's a click\n\n if (isClick) {\n break;\n }\n }\n }\n\n if (group.length > 1) {\n group = group.filter(function (object) {\n return !object.onSelect({\n e: e\n });\n });\n }\n\n return group;\n },\n\n /**\n * @private\n */\n _maybeGroupObjects: function (e) {\n if (this.selection && this._groupSelector) {\n this._groupSelectedObjects(e);\n }\n\n this.setCursor(this.defaultCursor); // clear selection and current transformation\n\n this._groupSelector = null;\n }\n });\n})();\n\n(function () {\n fabric.util.object.extend(fabric.StaticCanvas.prototype,\n /** @lends fabric.StaticCanvas.prototype */\n {\n /**\n * Exports canvas element to a dataurl image. Note that when multiplier is used, cropping is scaled appropriately\n * @param {Object} [options] Options object\n * @param {String} [options.format=png] The format of the output image. Either \"jpeg\" or \"png\"\n * @param {Number} [options.quality=1] Quality level (0..1). Only used for jpeg.\n * @param {Number} [options.multiplier=1] Multiplier to scale by, to have consistent\n * @param {Number} [options.left] Cropping left offset. Introduced in v1.2.14\n * @param {Number} [options.top] Cropping top offset. Introduced in v1.2.14\n * @param {Number} [options.width] Cropping width. Introduced in v1.2.14\n * @param {Number} [options.height] Cropping height. Introduced in v1.2.14\n * @param {Boolean} [options.enableRetinaScaling] Enable retina scaling for clone image. Introduce in 2.0.0\n * @return {String} Returns a data: URL containing a representation of the object in the format specified by options.format\n * @see {@link http://jsfiddle.net/fabricjs/NfZVb/|jsFiddle demo}\n * @example <caption>Generate jpeg dataURL with lower quality</caption>\n * var dataURL = canvas.toDataURL({\n * format: 'jpeg',\n * quality: 0.8\n * });\n * @example <caption>Generate cropped png dataURL (clipping of canvas)</caption>\n * var dataURL = canvas.toDataURL({\n * format: 'png',\n * left: 100,\n * top: 100,\n * width: 200,\n * height: 200\n * });\n * @example <caption>Generate double scaled png dataURL</caption>\n * var dataURL = canvas.toDataURL({\n * format: 'png',\n * multiplier: 2\n * });\n */\n toDataURL: function (options) {\n options || (options = {});\n var format = options.format || 'png',\n quality = options.quality || 1,\n multiplier = (options.multiplier || 1) * (options.enableRetinaScaling ? this.getRetinaScaling() : 1),\n canvasEl = this.toCanvasElement(multiplier, options);\n return fabric.util.toDataURL(canvasEl, format, quality);\n },\n\n /**\n * Create a new HTMLCanvas element painted with the current canvas content.\n * No need to resize the actual one or repaint it.\n * Will transfer object ownership to a new canvas, paint it, and set everything back.\n * This is an intermediary step used to get to a dataUrl but also it is useful to\n * create quick image copies of a canvas without passing for the dataUrl string\n * @param {Number} [multiplier] a zoom factor.\n * @param {Object} [cropping] Cropping informations\n * @param {Number} [cropping.left] Cropping left offset.\n * @param {Number} [cropping.top] Cropping top offset.\n * @param {Number} [cropping.width] Cropping width.\n * @param {Number} [cropping.height] Cropping height.\n */\n toCanvasElement: function (multiplier, cropping) {\n multiplier = multiplier || 1;\n cropping = cropping || {};\n var scaledWidth = (cropping.width || this.width) * multiplier,\n scaledHeight = (cropping.height || this.height) * multiplier,\n zoom = this.getZoom(),\n originalWidth = this.width,\n originalHeight = this.height,\n newZoom = zoom * multiplier,\n vp = this.viewportTransform,\n translateX = (vp[4] - (cropping.left || 0)) * multiplier,\n translateY = (vp[5] - (cropping.top || 0)) * multiplier,\n originalInteractive = this.interactive,\n newVp = [newZoom, 0, 0, newZoom, translateX, translateY],\n originalRetina = this.enableRetinaScaling,\n canvasEl = fabric.util.createCanvasElement(),\n originalContextTop = this.contextTop;\n canvasEl.width = scaledWidth;\n canvasEl.height = scaledHeight;\n this.contextTop = null;\n this.enableRetinaScaling = false;\n this.interactive = false;\n this.viewportTransform = newVp;\n this.width = scaledWidth;\n this.height = scaledHeight;\n this.calcViewportBoundaries();\n this.renderCanvas(canvasEl.getContext('2d'), this._objects);\n this.viewportTransform = vp;\n this.width = originalWidth;\n this.height = originalHeight;\n this.calcViewportBoundaries();\n this.interactive = originalInteractive;\n this.enableRetinaScaling = originalRetina;\n this.contextTop = originalContextTop;\n return canvasEl;\n }\n });\n})();\n\nfabric.util.object.extend(fabric.StaticCanvas.prototype,\n/** @lends fabric.StaticCanvas.prototype */\n{\n /**\n * Populates canvas with data from the specified JSON.\n * JSON format must conform to the one of {@link fabric.Canvas#toJSON}\n * @param {String|Object} json JSON string or object\n * @param {Function} callback Callback, invoked when json is parsed\n * and corresponding objects (e.g: {@link fabric.Image})\n * are initialized\n * @param {Function} [reviver] Method for further parsing of JSON elements, called after each fabric object created.\n * @return {fabric.Canvas} instance\n * @chainable\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-3#deserialization}\n * @see {@link http://jsfiddle.net/fabricjs/fmgXt/|jsFiddle demo}\n * @example <caption>loadFromJSON</caption>\n * canvas.loadFromJSON(json, canvas.renderAll.bind(canvas));\n * @example <caption>loadFromJSON with reviver</caption>\n * canvas.loadFromJSON(json, canvas.renderAll.bind(canvas), function(o, object) {\n * // `o` = json object\n * // `object` = fabric.Object instance\n * // ... do some stuff ...\n * });\n */\n loadFromJSON: function (json, callback, reviver) {\n if (!json) {\n return;\n } // serialize if it wasn't already\n\n\n var serialized = typeof json === 'string' ? JSON.parse(json) : fabric.util.object.clone(json);\n\n var _this = this,\n clipPath = serialized.clipPath,\n renderOnAddRemove = this.renderOnAddRemove;\n\n this.renderOnAddRemove = false;\n delete serialized.clipPath;\n\n this._enlivenObjects(serialized.objects, function (enlivenedObjects) {\n _this.clear();\n\n _this._setBgOverlay(serialized, function () {\n if (clipPath) {\n _this._enlivenObjects([clipPath], function (enlivenedCanvasClip) {\n _this.clipPath = enlivenedCanvasClip[0];\n\n _this.__setupCanvas.call(_this, serialized, enlivenedObjects, renderOnAddRemove, callback);\n });\n } else {\n _this.__setupCanvas.call(_this, serialized, enlivenedObjects, renderOnAddRemove, callback);\n }\n });\n }, reviver);\n\n return this;\n },\n\n /**\n * @private\n * @param {Object} serialized Object with background and overlay information\n * @param {Array} restored canvas objects\n * @param {Function} cached renderOnAddRemove callback\n * @param {Function} callback Invoked after all background and overlay images/patterns loaded\n */\n __setupCanvas: function (serialized, enlivenedObjects, renderOnAddRemove, callback) {\n var _this = this;\n\n enlivenedObjects.forEach(function (obj, index) {\n // we splice the array just in case some custom classes restored from JSON\n // will add more object to canvas at canvas init.\n _this.insertAt(obj, index);\n });\n this.renderOnAddRemove = renderOnAddRemove; // remove parts i cannot set as options\n\n delete serialized.objects;\n delete serialized.backgroundImage;\n delete serialized.overlayImage;\n delete serialized.background;\n delete serialized.overlay; // this._initOptions does too many things to just\n // call it. Normally loading an Object from JSON\n // create the Object instance. Here the Canvas is\n // already an instance and we are just loading things over it\n\n this._setOptions(serialized);\n\n this.renderAll();\n callback && callback();\n },\n\n /**\n * @private\n * @param {Object} serialized Object with background and overlay information\n * @param {Function} callback Invoked after all background and overlay images/patterns loaded\n */\n _setBgOverlay: function (serialized, callback) {\n var loaded = {\n backgroundColor: false,\n overlayColor: false,\n backgroundImage: false,\n overlayImage: false\n };\n\n if (!serialized.backgroundImage && !serialized.overlayImage && !serialized.background && !serialized.overlay) {\n callback && callback();\n return;\n }\n\n var cbIfLoaded = function () {\n if (loaded.backgroundImage && loaded.overlayImage && loaded.backgroundColor && loaded.overlayColor) {\n callback && callback();\n }\n };\n\n this.__setBgOverlay('backgroundImage', serialized.backgroundImage, loaded, cbIfLoaded);\n\n this.__setBgOverlay('overlayImage', serialized.overlayImage, loaded, cbIfLoaded);\n\n this.__setBgOverlay('backgroundColor', serialized.background, loaded, cbIfLoaded);\n\n this.__setBgOverlay('overlayColor', serialized.overlay, loaded, cbIfLoaded);\n },\n\n /**\n * @private\n * @param {String} property Property to set (backgroundImage, overlayImage, backgroundColor, overlayColor)\n * @param {(Object|String)} value Value to set\n * @param {Object} loaded Set loaded property to true if property is set\n * @param {Object} callback Callback function to invoke after property is set\n */\n __setBgOverlay: function (property, value, loaded, callback) {\n var _this = this;\n\n if (!value) {\n loaded[property] = true;\n callback && callback();\n return;\n }\n\n if (property === 'backgroundImage' || property === 'overlayImage') {\n fabric.util.enlivenObjects([value], function (enlivedObject) {\n _this[property] = enlivedObject[0];\n loaded[property] = true;\n callback && callback();\n });\n } else {\n this['set' + fabric.util.string.capitalize(property, true)](value, function () {\n loaded[property] = true;\n callback && callback();\n });\n }\n },\n\n /**\n * @private\n * @param {Array} objects\n * @param {Function} callback\n * @param {Function} [reviver]\n */\n _enlivenObjects: function (objects, callback, reviver) {\n if (!objects || objects.length === 0) {\n callback && callback([]);\n return;\n }\n\n fabric.util.enlivenObjects(objects, function (enlivenedObjects) {\n callback && callback(enlivenedObjects);\n }, null, reviver);\n },\n\n /**\n * @private\n * @param {String} format\n * @param {Function} callback\n */\n _toDataURL: function (format, callback) {\n this.clone(function (clone) {\n callback(clone.toDataURL(format));\n });\n },\n\n /**\n * @private\n * @param {String} format\n * @param {Number} multiplier\n * @param {Function} callback\n */\n _toDataURLWithMultiplier: function (format, multiplier, callback) {\n this.clone(function (clone) {\n callback(clone.toDataURLWithMultiplier(format, multiplier));\n });\n },\n\n /**\n * Clones canvas instance\n * @param {Object} [callback] Receives cloned instance as a first argument\n * @param {Array} [properties] Array of properties to include in the cloned canvas and children\n */\n clone: function (callback, properties) {\n var data = JSON.stringify(this.toJSON(properties));\n this.cloneWithoutData(function (clone) {\n clone.loadFromJSON(data, function () {\n callback && callback(clone);\n });\n });\n },\n\n /**\n * Clones canvas instance without cloning existing data.\n * This essentially copies canvas dimensions, clipping properties, etc.\n * but leaves data empty (so that you can populate it with your own)\n * @param {Object} [callback] Receives cloned instance as a first argument\n */\n cloneWithoutData: function (callback) {\n var el = fabric.util.createCanvasElement();\n el.width = this.width;\n el.height = this.height;\n var clone = new fabric.Canvas(el);\n\n if (this.backgroundImage) {\n clone.setBackgroundImage(this.backgroundImage.src, function () {\n clone.renderAll();\n callback && callback(clone);\n });\n clone.backgroundImageOpacity = this.backgroundImageOpacity;\n clone.backgroundImageStretch = this.backgroundImageStretch;\n } else {\n callback && callback(clone);\n }\n }\n});\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n extend = fabric.util.object.extend,\n clone = fabric.util.object.clone,\n toFixed = fabric.util.toFixed,\n capitalize = fabric.util.string.capitalize,\n degreesToRadians = fabric.util.degreesToRadians,\n supportsLineDash = fabric.StaticCanvas.supports('setLineDash'),\n objectCaching = !fabric.isLikelyNode,\n ALIASING_LIMIT = 2;\n\n if (fabric.Object) {\n return;\n }\n /**\n * Root object class from which all 2d shape classes inherit from\n * @class fabric.Object\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-1#objects}\n * @see {@link fabric.Object#initialize} for constructor definition\n *\n * @fires added\n * @fires removed\n *\n * @fires selected\n * @fires deselected\n * @fires modified\n * @fires modified\n * @fires moved\n * @fires scaled\n * @fires rotated\n * @fires skewed\n *\n * @fires rotating\n * @fires scaling\n * @fires moving\n * @fires skewing\n *\n * @fires mousedown\n * @fires mouseup\n * @fires mouseover\n * @fires mouseout\n * @fires mousewheel\n * @fires mousedblclick\n *\n * @fires dragover\n * @fires dragenter\n * @fires dragleave\n * @fires drop\n */\n\n\n fabric.Object = fabric.util.createClass(fabric.CommonMethods,\n /** @lends fabric.Object.prototype */\n {\n /**\n * Type of an object (rect, circle, path, etc.).\n * Note that this property is meant to be read-only and not meant to be modified.\n * If you modify, certain parts of Fabric (such as JSON loading) won't work correctly.\n * @type String\n * @default\n */\n type: 'object',\n\n /**\n * Horizontal origin of transformation of an object (one of \"left\", \"right\", \"center\")\n * See http://jsfiddle.net/1ow02gea/244/ on how originX/originY affect objects in groups\n * @type String\n * @default\n */\n originX: 'left',\n\n /**\n * Vertical origin of transformation of an object (one of \"top\", \"bottom\", \"center\")\n * See http://jsfiddle.net/1ow02gea/244/ on how originX/originY affect objects in groups\n * @type String\n * @default\n */\n originY: 'top',\n\n /**\n * Top position of an object. Note that by default it's relative to object top. You can change this by setting originY={top/center/bottom}\n * @type Number\n * @default\n */\n top: 0,\n\n /**\n * Left position of an object. Note that by default it's relative to object left. You can change this by setting originX={left/center/right}\n * @type Number\n * @default\n */\n left: 0,\n\n /**\n * Object width\n * @type Number\n * @default\n */\n width: 0,\n\n /**\n * Object height\n * @type Number\n * @default\n */\n height: 0,\n\n /**\n * Object scale factor (horizontal)\n * @type Number\n * @default\n */\n scaleX: 1,\n\n /**\n * Object scale factor (vertical)\n * @type Number\n * @default\n */\n scaleY: 1,\n\n /**\n * When true, an object is rendered as flipped horizontally\n * @type Boolean\n * @default\n */\n flipX: false,\n\n /**\n * When true, an object is rendered as flipped vertically\n * @type Boolean\n * @default\n */\n flipY: false,\n\n /**\n * Opacity of an object\n * @type Number\n * @default\n */\n opacity: 1,\n\n /**\n * Angle of rotation of an object (in degrees)\n * @type Number\n * @default\n */\n angle: 0,\n\n /**\n * Angle of skew on x axes of an object (in degrees)\n * @type Number\n * @default\n */\n skewX: 0,\n\n /**\n * Angle of skew on y axes of an object (in degrees)\n * @type Number\n * @default\n */\n skewY: 0,\n\n /**\n * Size of object's controlling corners (in pixels)\n * @type Number\n * @default\n */\n cornerSize: 13,\n\n /**\n * Size of object's controlling corners when touch interaction is detected\n * @type Number\n * @default\n */\n touchCornerSize: 24,\n\n /**\n * When true, object's controlling corners are rendered as transparent inside (i.e. stroke instead of fill)\n * @type Boolean\n * @default\n */\n transparentCorners: true,\n\n /**\n * Default cursor value used when hovering over this object on canvas\n * @type String\n * @default\n */\n hoverCursor: null,\n\n /**\n * Default cursor value used when moving this object on canvas\n * @type String\n * @default\n */\n moveCursor: null,\n\n /**\n * Padding between object and its controlling borders (in pixels)\n * @type Number\n * @default\n */\n padding: 0,\n\n /**\n * Color of controlling borders of an object (when it's active)\n * @type String\n * @default\n */\n borderColor: 'rgb(178,204,255)',\n\n /**\n * Array specifying dash pattern of an object's borders (hasBorder must be true)\n * @since 1.6.2\n * @type Array\n */\n borderDashArray: null,\n\n /**\n * Color of controlling corners of an object (when it's active)\n * @type String\n * @default\n */\n cornerColor: 'rgb(178,204,255)',\n\n /**\n * Color of controlling corners of an object (when it's active and transparentCorners false)\n * @since 1.6.2\n * @type String\n * @default\n */\n cornerStrokeColor: null,\n\n /**\n * Specify style of control, 'rect' or 'circle'\n * @since 1.6.2\n * @type String\n */\n cornerStyle: 'rect',\n\n /**\n * Array specifying dash pattern of an object's control (hasBorder must be true)\n * @since 1.6.2\n * @type Array\n */\n cornerDashArray: null,\n\n /**\n * When true, this object will use center point as the origin of transformation\n * when being scaled via the controls.\n * <b>Backwards incompatibility note:</b> This property replaces \"centerTransform\" (Boolean).\n * @since 1.3.4\n * @type Boolean\n * @default\n */\n centeredScaling: false,\n\n /**\n * When true, this object will use center point as the origin of transformation\n * when being rotated via the controls.\n * <b>Backwards incompatibility note:</b> This property replaces \"centerTransform\" (Boolean).\n * @since 1.3.4\n * @type Boolean\n * @default\n */\n centeredRotation: true,\n\n /**\n * Color of object's fill\n * takes css colors https://www.w3.org/TR/css-color-3/\n * @type String\n * @default\n */\n fill: 'rgb(0,0,0)',\n\n /**\n * Fill rule used to fill an object\n * accepted values are nonzero, evenodd\n * <b>Backwards incompatibility note:</b> This property was used for setting globalCompositeOperation until v1.4.12 (use `fabric.Object#globalCompositeOperation` instead)\n * @type String\n * @default\n */\n fillRule: 'nonzero',\n\n /**\n * Composite rule used for canvas globalCompositeOperation\n * @type String\n * @default\n */\n globalCompositeOperation: 'source-over',\n\n /**\n * Background color of an object.\n * takes css colors https://www.w3.org/TR/css-color-3/\n * @type String\n * @default\n */\n backgroundColor: '',\n\n /**\n * Selection Background color of an object. colored layer behind the object when it is active.\n * does not mix good with globalCompositeOperation methods.\n * @type String\n * @default\n */\n selectionBackgroundColor: '',\n\n /**\n * When defined, an object is rendered via stroke and this property specifies its color\n * takes css colors https://www.w3.org/TR/css-color-3/\n * @type String\n * @default\n */\n stroke: null,\n\n /**\n * Width of a stroke used to render this object\n * @type Number\n * @default\n */\n strokeWidth: 1,\n\n /**\n * Array specifying dash pattern of an object's stroke (stroke must be defined)\n * @type Array\n */\n strokeDashArray: null,\n\n /**\n * Line offset of an object's stroke\n * @type Number\n * @default\n */\n strokeDashOffset: 0,\n\n /**\n * Line endings style of an object's stroke (one of \"butt\", \"round\", \"square\")\n * @type String\n * @default\n */\n strokeLineCap: 'butt',\n\n /**\n * Corner style of an object's stroke (one of \"bevil\", \"round\", \"miter\")\n * @type String\n * @default\n */\n strokeLineJoin: 'miter',\n\n /**\n * Maximum miter length (used for strokeLineJoin = \"miter\") of an object's stroke\n * @type Number\n * @default\n */\n strokeMiterLimit: 4,\n\n /**\n * Shadow object representing shadow of this shape\n * @type fabric.Shadow\n * @default\n */\n shadow: null,\n\n /**\n * Opacity of object's controlling borders when object is active and moving\n * @type Number\n * @default\n */\n borderOpacityWhenMoving: 0.4,\n\n /**\n * Scale factor of object's controlling borders\n * bigger number will make a thicker border\n * border is 1, so this is basically a border tickness\n * since there is no way to change the border itself.\n * @type Number\n * @default\n */\n borderScaleFactor: 1,\n\n /**\n * Minimum allowed scale value of an object\n * @type Number\n * @default\n */\n minScaleLimit: 0,\n\n /**\n * When set to `false`, an object can not be selected for modification (using either point-click-based or group-based selection).\n * But events still fire on it.\n * @type Boolean\n * @default\n */\n selectable: true,\n\n /**\n * When set to `false`, an object can not be a target of events. All events propagate through it. Introduced in v1.3.4\n * @type Boolean\n * @default\n */\n evented: true,\n\n /**\n * When set to `false`, an object is not rendered on canvas\n * @type Boolean\n * @default\n */\n visible: true,\n\n /**\n * When set to `false`, object's controls are not displayed and can not be used to manipulate object\n * @type Boolean\n * @default\n */\n hasControls: true,\n\n /**\n * When set to `false`, object's controlling borders are not rendered\n * @type Boolean\n * @default\n */\n hasBorders: true,\n\n /**\n * When set to `true`, objects are \"found\" on canvas on per-pixel basis rather than according to bounding box\n * @type Boolean\n * @default\n */\n perPixelTargetFind: false,\n\n /**\n * When `false`, default object's values are not included in its serialization\n * @type Boolean\n * @default\n */\n includeDefaultValues: true,\n\n /**\n * When `true`, object horizontal movement is locked\n * @type Boolean\n * @default\n */\n lockMovementX: false,\n\n /**\n * When `true`, object vertical movement is locked\n * @type Boolean\n * @default\n */\n lockMovementY: false,\n\n /**\n * When `true`, object rotation is locked\n * @type Boolean\n * @default\n */\n lockRotation: false,\n\n /**\n * When `true`, object horizontal scaling is locked\n * @type Boolean\n * @default\n */\n lockScalingX: false,\n\n /**\n * When `true`, object vertical scaling is locked\n * @type Boolean\n * @default\n */\n lockScalingY: false,\n\n /**\n * When `true`, object horizontal skewing is locked\n * @type Boolean\n * @default\n */\n lockSkewingX: false,\n\n /**\n * When `true`, object vertical skewing is locked\n * @type Boolean\n * @default\n */\n lockSkewingY: false,\n\n /**\n * When `true`, object cannot be flipped by scaling into negative values\n * @type Boolean\n * @default\n */\n lockScalingFlip: false,\n\n /**\n * When `true`, object is not exported in OBJECT/JSON\n * @since 1.6.3\n * @type Boolean\n * @default\n */\n excludeFromExport: false,\n\n /**\n * When `true`, object is cached on an additional canvas.\n * When `false`, object is not cached unless necessary ( clipPath )\n * default to true\n * @since 1.7.0\n * @type Boolean\n * @default true\n */\n objectCaching: objectCaching,\n\n /**\n * When `true`, object properties are checked for cache invalidation. In some particular\n * situation you may want this to be disabled ( spray brush, very big, groups)\n * or if your application does not allow you to modify properties for groups child you want\n * to disable it for groups.\n * default to false\n * since 1.7.0\n * @type Boolean\n * @default false\n */\n statefullCache: false,\n\n /**\n * When `true`, cache does not get updated during scaling. The picture will get blocky if scaled\n * too much and will be redrawn with correct details at the end of scaling.\n * this setting is performance and application dependant.\n * default to true\n * since 1.7.0\n * @type Boolean\n * @default true\n */\n noScaleCache: true,\n\n /**\n * When `false`, the stoke width will scale with the object.\n * When `true`, the stroke will always match the exact pixel size entered for stroke width.\n * default to false\n * @since 2.6.0\n * @type Boolean\n * @default false\n * @type Boolean\n * @default false\n */\n strokeUniform: false,\n\n /**\n * When set to `true`, object's cache will be rerendered next render call.\n * since 1.7.0\n * @type Boolean\n * @default true\n */\n dirty: true,\n\n /**\n * keeps the value of the last hovered corner during mouse move.\n * 0 is no corner, or 'mt', 'ml', 'mtr' etc..\n * It should be private, but there is no harm in using it as\n * a read-only property.\n * @type number|string|any\n * @default 0\n */\n __corner: 0,\n\n /**\n * Determines if the fill or the stroke is drawn first (one of \"fill\" or \"stroke\")\n * @type String\n * @default\n */\n paintFirst: 'fill',\n\n /**\n * List of properties to consider when checking if state\n * of an object is changed (fabric.Object#hasStateChanged)\n * as well as for history (undo/redo) purposes\n * @type Array\n */\n stateProperties: ('top left width height scaleX scaleY flipX flipY originX originY transformMatrix ' + 'stroke strokeWidth strokeDashArray strokeLineCap strokeDashOffset strokeLineJoin strokeMiterLimit ' + 'angle opacity fill globalCompositeOperation shadow visible backgroundColor ' + 'skewX skewY fillRule paintFirst clipPath strokeUniform').split(' '),\n\n /**\n * List of properties to consider when checking if cache needs refresh\n * Those properties are checked by statefullCache ON ( or lazy mode if we want ) or from single\n * calls to Object.set(key, value). If the key is in this list, the object is marked as dirty\n * and refreshed at the next render\n * @type Array\n */\n cacheProperties: ('fill stroke strokeWidth strokeDashArray width height paintFirst strokeUniform' + ' strokeLineCap strokeDashOffset strokeLineJoin strokeMiterLimit backgroundColor clipPath').split(' '),\n\n /**\n * List of properties to consider for animating colors.\n * @type Array\n */\n colorProperties: 'fill stroke backgroundColor'.split(' '),\n\n /**\n * a fabricObject that, without stroke define a clipping area with their shape. filled in black\n * the clipPath object gets used when the object has rendered, and the context is placed in the center\n * of the object cacheCanvas.\n * If you want 0,0 of a clipPath to align with an object center, use clipPath.originX/Y to 'center'\n * @type fabric.Object\n */\n clipPath: undefined,\n\n /**\n * Meaningful ONLY when the object is used as clipPath.\n * if true, the clipPath will make the object clip to the outside of the clipPath\n * since 2.4.0\n * @type boolean\n * @default false\n */\n inverted: false,\n\n /**\n * Meaningful ONLY when the object is used as clipPath.\n * if true, the clipPath will have its top and left relative to canvas, and will\n * not be influenced by the object transform. This will make the clipPath relative\n * to the canvas, but clipping just a particular object.\n * WARNING this is beta, this feature may change or be renamed.\n * since 2.4.0\n * @type boolean\n * @default false\n */\n absolutePositioned: false,\n\n /**\n * Constructor\n * @param {Object} [options] Options object\n */\n initialize: function (options) {\n if (options) {\n this.setOptions(options);\n }\n },\n\n /**\n * Create a the canvas used to keep the cached copy of the object\n * @private\n */\n _createCacheCanvas: function () {\n this._cacheProperties = {};\n this._cacheCanvas = fabric.util.createCanvasElement();\n this._cacheContext = this._cacheCanvas.getContext('2d');\n\n this._updateCacheCanvas(); // if canvas gets created, is empty, so dirty.\n\n\n this.dirty = true;\n },\n\n /**\n * Limit the cache dimensions so that X * Y do not cross fabric.perfLimitSizeTotal\n * and each side do not cross fabric.cacheSideLimit\n * those numbers are configurable so that you can get as much detail as you want\n * making bargain with performances.\n * @param {Object} dims\n * @param {Object} dims.width width of canvas\n * @param {Object} dims.height height of canvas\n * @param {Object} dims.zoomX zoomX zoom value to unscale the canvas before drawing cache\n * @param {Object} dims.zoomY zoomY zoom value to unscale the canvas before drawing cache\n * @return {Object}.width width of canvas\n * @return {Object}.height height of canvas\n * @return {Object}.zoomX zoomX zoom value to unscale the canvas before drawing cache\n * @return {Object}.zoomY zoomY zoom value to unscale the canvas before drawing cache\n */\n _limitCacheSize: function (dims) {\n var perfLimitSizeTotal = fabric.perfLimitSizeTotal,\n width = dims.width,\n height = dims.height,\n max = fabric.maxCacheSideLimit,\n min = fabric.minCacheSideLimit;\n\n if (width <= max && height <= max && width * height <= perfLimitSizeTotal) {\n if (width < min) {\n dims.width = min;\n }\n\n if (height < min) {\n dims.height = min;\n }\n\n return dims;\n }\n\n var ar = width / height,\n limitedDims = fabric.util.limitDimsByArea(ar, perfLimitSizeTotal),\n capValue = fabric.util.capValue,\n x = capValue(min, limitedDims.x, max),\n y = capValue(min, limitedDims.y, max);\n\n if (width > x) {\n dims.zoomX /= width / x;\n dims.width = x;\n dims.capped = true;\n }\n\n if (height > y) {\n dims.zoomY /= height / y;\n dims.height = y;\n dims.capped = true;\n }\n\n return dims;\n },\n\n /**\n * Return the dimension and the zoom level needed to create a cache canvas\n * big enough to host the object to be cached.\n * @private\n * @return {Object}.x width of object to be cached\n * @return {Object}.y height of object to be cached\n * @return {Object}.width width of canvas\n * @return {Object}.height height of canvas\n * @return {Object}.zoomX zoomX zoom value to unscale the canvas before drawing cache\n * @return {Object}.zoomY zoomY zoom value to unscale the canvas before drawing cache\n */\n _getCacheCanvasDimensions: function () {\n var objectScale = this.getTotalObjectScaling(),\n // caculate dimensions without skewing\n dim = this._getTransformedDimensions(0, 0),\n neededX = dim.x * objectScale.scaleX / this.scaleX,\n neededY = dim.y * objectScale.scaleY / this.scaleY;\n\n return {\n // for sure this ALIASING_LIMIT is slightly creating problem\n // in situation in which the cache canvas gets an upper limit\n // also objectScale contains already scaleX and scaleY\n width: neededX + ALIASING_LIMIT,\n height: neededY + ALIASING_LIMIT,\n zoomX: objectScale.scaleX,\n zoomY: objectScale.scaleY,\n x: neededX,\n y: neededY\n };\n },\n\n /**\n * Update width and height of the canvas for cache\n * returns true or false if canvas needed resize.\n * @private\n * @return {Boolean} true if the canvas has been resized\n */\n _updateCacheCanvas: function () {\n var targetCanvas = this.canvas;\n\n if (this.noScaleCache && targetCanvas && targetCanvas._currentTransform) {\n var target = targetCanvas._currentTransform.target,\n action = targetCanvas._currentTransform.action;\n\n if (this === target && action.slice && action.slice(0, 5) === 'scale') {\n return false;\n }\n }\n\n var canvas = this._cacheCanvas,\n dims = this._limitCacheSize(this._getCacheCanvasDimensions()),\n minCacheSize = fabric.minCacheSideLimit,\n width = dims.width,\n height = dims.height,\n drawingWidth,\n drawingHeight,\n zoomX = dims.zoomX,\n zoomY = dims.zoomY,\n dimensionsChanged = width !== this.cacheWidth || height !== this.cacheHeight,\n zoomChanged = this.zoomX !== zoomX || this.zoomY !== zoomY,\n shouldRedraw = dimensionsChanged || zoomChanged,\n additionalWidth = 0,\n additionalHeight = 0,\n shouldResizeCanvas = false;\n\n if (dimensionsChanged) {\n var canvasWidth = this._cacheCanvas.width,\n canvasHeight = this._cacheCanvas.height,\n sizeGrowing = width > canvasWidth || height > canvasHeight,\n sizeShrinking = (width < canvasWidth * 0.9 || height < canvasHeight * 0.9) && canvasWidth > minCacheSize && canvasHeight > minCacheSize;\n shouldResizeCanvas = sizeGrowing || sizeShrinking;\n\n if (sizeGrowing && !dims.capped && (width > minCacheSize || height > minCacheSize)) {\n additionalWidth = width * 0.1;\n additionalHeight = height * 0.1;\n }\n }\n\n if (shouldRedraw) {\n if (shouldResizeCanvas) {\n canvas.width = Math.ceil(width + additionalWidth);\n canvas.height = Math.ceil(height + additionalHeight);\n } else {\n this._cacheContext.setTransform(1, 0, 0, 1, 0, 0);\n\n this._cacheContext.clearRect(0, 0, canvas.width, canvas.height);\n }\n\n drawingWidth = dims.x / 2;\n drawingHeight = dims.y / 2;\n this.cacheTranslationX = Math.round(canvas.width / 2 - drawingWidth) + drawingWidth;\n this.cacheTranslationY = Math.round(canvas.height / 2 - drawingHeight) + drawingHeight;\n this.cacheWidth = width;\n this.cacheHeight = height;\n\n this._cacheContext.translate(this.cacheTranslationX, this.cacheTranslationY);\n\n this._cacheContext.scale(zoomX, zoomY);\n\n this.zoomX = zoomX;\n this.zoomY = zoomY;\n return true;\n }\n\n return false;\n },\n\n /**\n * Sets object's properties from options\n * @param {Object} [options] Options object\n */\n setOptions: function (options) {\n this._setOptions(options);\n\n this._initGradient(options.fill, 'fill');\n\n this._initGradient(options.stroke, 'stroke');\n\n this._initPattern(options.fill, 'fill');\n\n this._initPattern(options.stroke, 'stroke');\n },\n\n /**\n * Transforms context when rendering an object\n * @param {CanvasRenderingContext2D} ctx Context\n */\n transform: function (ctx) {\n var needFullTransform = this.group && !this.group._transformDone || this.group && this.canvas && ctx === this.canvas.contextTop;\n var m = this.calcTransformMatrix(!needFullTransform);\n ctx.transform(m[0], m[1], m[2], m[3], m[4], m[5]);\n },\n\n /**\n * Returns an object representation of an instance\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} Object representation of an instance\n */\n toObject: function (propertiesToInclude) {\n var NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS,\n object = {\n type: this.type,\n version: fabric.version,\n originX: this.originX,\n originY: this.originY,\n left: toFixed(this.left, NUM_FRACTION_DIGITS),\n top: toFixed(this.top, NUM_FRACTION_DIGITS),\n width: toFixed(this.width, NUM_FRACTION_DIGITS),\n height: toFixed(this.height, NUM_FRACTION_DIGITS),\n fill: this.fill && this.fill.toObject ? this.fill.toObject() : this.fill,\n stroke: this.stroke && this.stroke.toObject ? this.stroke.toObject() : this.stroke,\n strokeWidth: toFixed(this.strokeWidth, NUM_FRACTION_DIGITS),\n strokeDashArray: this.strokeDashArray ? this.strokeDashArray.concat() : this.strokeDashArray,\n strokeLineCap: this.strokeLineCap,\n strokeDashOffset: this.strokeDashOffset,\n strokeLineJoin: this.strokeLineJoin,\n // strokeUniform: this.strokeUniform,\n strokeMiterLimit: toFixed(this.strokeMiterLimit, NUM_FRACTION_DIGITS),\n scaleX: toFixed(this.scaleX, NUM_FRACTION_DIGITS),\n scaleY: toFixed(this.scaleY, NUM_FRACTION_DIGITS),\n angle: toFixed(this.angle, NUM_FRACTION_DIGITS),\n flipX: this.flipX,\n flipY: this.flipY,\n opacity: toFixed(this.opacity, NUM_FRACTION_DIGITS),\n shadow: this.shadow && this.shadow.toObject ? this.shadow.toObject() : this.shadow,\n visible: this.visible,\n backgroundColor: this.backgroundColor,\n fillRule: this.fillRule,\n paintFirst: this.paintFirst,\n globalCompositeOperation: this.globalCompositeOperation,\n skewX: toFixed(this.skewX, NUM_FRACTION_DIGITS),\n skewY: toFixed(this.skewY, NUM_FRACTION_DIGITS)\n };\n\n if (this.clipPath) {\n object.clipPath = this.clipPath.toObject(propertiesToInclude);\n object.clipPath.inverted = this.clipPath.inverted;\n object.clipPath.absolutePositioned = this.clipPath.absolutePositioned;\n }\n\n fabric.util.populateWithProperties(this, object, propertiesToInclude);\n\n if (!this.includeDefaultValues) {\n object = this._removeDefaultValues(object);\n }\n\n return object;\n },\n\n /**\n * Returns (dataless) object representation of an instance\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} Object representation of an instance\n */\n toDatalessObject: function (propertiesToInclude) {\n // will be overwritten by subclasses\n return this.toObject(propertiesToInclude);\n },\n\n /**\n * @private\n * @param {Object} object\n */\n _removeDefaultValues: function (object) {\n var prototype = fabric.util.getKlass(object.type).prototype,\n stateProperties = prototype.stateProperties;\n stateProperties.forEach(function (prop) {\n if (prop === 'left' || prop === 'top') {\n return;\n }\n\n if (object[prop] === prototype[prop]) {\n delete object[prop];\n }\n\n var isArray = Object.prototype.toString.call(object[prop]) === '[object Array]' && Object.prototype.toString.call(prototype[prop]) === '[object Array]'; // basically a check for [] === []\n\n if (isArray && object[prop].length === 0 && prototype[prop].length === 0) {\n delete object[prop];\n }\n });\n return object;\n },\n\n /**\n * Returns a string representation of an instance\n * @return {String}\n */\n toString: function () {\n return '#<fabric.' + capitalize(this.type) + '>';\n },\n\n /**\n * Return the object scale factor counting also the group scaling\n * @return {Object} object with scaleX and scaleY properties\n */\n getObjectScaling: function () {\n var options = fabric.util.qrDecompose(this.calcTransformMatrix());\n return {\n scaleX: Math.abs(options.scaleX),\n scaleY: Math.abs(options.scaleY)\n };\n },\n\n /**\n * Return the object scale factor counting also the group scaling, zoom and retina\n * @return {Object} object with scaleX and scaleY properties\n */\n getTotalObjectScaling: function () {\n var scale = this.getObjectScaling(),\n scaleX = scale.scaleX,\n scaleY = scale.scaleY;\n\n if (this.canvas) {\n var zoom = this.canvas.getZoom();\n var retina = this.canvas.getRetinaScaling();\n scaleX *= zoom * retina;\n scaleY *= zoom * retina;\n }\n\n return {\n scaleX: scaleX,\n scaleY: scaleY\n };\n },\n\n /**\n * Return the object opacity counting also the group property\n * @return {Number}\n */\n getObjectOpacity: function () {\n var opacity = this.opacity;\n\n if (this.group) {\n opacity *= this.group.getObjectOpacity();\n }\n\n return opacity;\n },\n\n /**\n * @private\n * @param {String} key\n * @param {*} value\n * @return {fabric.Object} thisArg\n */\n _set: function (key, value) {\n var shouldConstrainValue = key === 'scaleX' || key === 'scaleY',\n isChanged = this[key] !== value,\n groupNeedsUpdate = false;\n\n if (shouldConstrainValue) {\n value = this._constrainScale(value);\n }\n\n if (key === 'scaleX' && value < 0) {\n this.flipX = !this.flipX;\n value *= -1;\n } else if (key === 'scaleY' && value < 0) {\n this.flipY = !this.flipY;\n value *= -1;\n } else if (key === 'shadow' && value && !(value instanceof fabric.Shadow)) {\n value = new fabric.Shadow(value);\n } else if (key === 'dirty' && this.group) {\n this.group.set('dirty', value);\n }\n\n this[key] = value;\n\n if (isChanged) {\n groupNeedsUpdate = this.group && this.group.isOnACache();\n\n if (this.cacheProperties.indexOf(key) > -1) {\n this.dirty = true;\n groupNeedsUpdate && this.group.set('dirty', true);\n } else if (groupNeedsUpdate && this.stateProperties.indexOf(key) > -1) {\n this.group.set('dirty', true);\n }\n }\n\n return this;\n },\n\n /**\n * This callback function is called by the parent group of an object every\n * time a non-delegated property changes on the group. It is passed the key\n * and value as parameters. Not adding in this function's signature to avoid\n * Travis build error about unused variables.\n */\n setOnGroup: function () {// implemented by sub-classes, as needed.\n },\n\n /**\n * Retrieves viewportTransform from Object's canvas if possible\n * @method getViewportTransform\n * @memberOf fabric.Object.prototype\n * @return {Array}\n */\n getViewportTransform: function () {\n if (this.canvas && this.canvas.viewportTransform) {\n return this.canvas.viewportTransform;\n }\n\n return fabric.iMatrix.concat();\n },\n\n /*\n * @private\n * return if the object would be visible in rendering\n * @memberOf fabric.Object.prototype\n * @return {Boolean}\n */\n isNotVisible: function () {\n return this.opacity === 0 || !this.width && !this.height && this.strokeWidth === 0 || !this.visible;\n },\n\n /**\n * Renders an object on a specified context\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n render: function (ctx) {\n // do not render if width/height are zeros or object is not visible\n if (this.isNotVisible()) {\n return;\n }\n\n if (this.canvas && this.canvas.skipOffscreen && !this.group && !this.isOnScreen()) {\n return;\n }\n\n ctx.save();\n\n this._setupCompositeOperation(ctx);\n\n this.drawSelectionBackground(ctx);\n this.transform(ctx);\n\n this._setOpacity(ctx);\n\n this._setShadow(ctx, this);\n\n if (this.shouldCache()) {\n this.renderCache();\n this.drawCacheOnCanvas(ctx);\n } else {\n this._removeCacheCanvas();\n\n this.dirty = false;\n this.drawObject(ctx);\n\n if (this.objectCaching && this.statefullCache) {\n this.saveState({\n propertySet: 'cacheProperties'\n });\n }\n }\n\n ctx.restore();\n },\n renderCache: function (options) {\n options = options || {};\n\n if (!this._cacheCanvas) {\n this._createCacheCanvas();\n }\n\n if (this.isCacheDirty()) {\n this.statefullCache && this.saveState({\n propertySet: 'cacheProperties'\n });\n this.drawObject(this._cacheContext, options.forClipping);\n this.dirty = false;\n }\n },\n\n /**\n * Remove cacheCanvas and its dimensions from the objects\n */\n _removeCacheCanvas: function () {\n this._cacheCanvas = null;\n this.cacheWidth = 0;\n this.cacheHeight = 0;\n },\n\n /**\n * return true if the object will draw a stroke\n * Does not consider text styles. This is just a shortcut used at rendering time\n * We want it to be an aproximation and be fast.\n * wrote to avoid extra caching, it has to return true when stroke happens,\n * can guess when it will not happen at 100% chance, does not matter if it misses\n * some use case where the stroke is invisible.\n * @since 3.0.0\n * @returns Boolean\n */\n hasStroke: function () {\n return this.stroke && this.stroke !== 'transparent' && this.strokeWidth !== 0;\n },\n\n /**\n * return true if the object will draw a fill\n * Does not consider text styles. This is just a shortcut used at rendering time\n * We want it to be an aproximation and be fast.\n * wrote to avoid extra caching, it has to return true when fill happens,\n * can guess when it will not happen at 100% chance, does not matter if it misses\n * some use case where the fill is invisible.\n * @since 3.0.0\n * @returns Boolean\n */\n hasFill: function () {\n return this.fill && this.fill !== 'transparent';\n },\n\n /**\n * When set to `true`, force the object to have its own cache, even if it is inside a group\n * it may be needed when your object behave in a particular way on the cache and always needs\n * its own isolated canvas to render correctly.\n * Created to be overridden\n * since 1.7.12\n * @returns Boolean\n */\n needsItsOwnCache: function () {\n if (this.paintFirst === 'stroke' && this.hasFill() && this.hasStroke() && typeof this.shadow === 'object') {\n return true;\n }\n\n if (this.clipPath) {\n return true;\n }\n\n return false;\n },\n\n /**\n * Decide if the object should cache or not. Create its own cache level\n * objectCaching is a global flag, wins over everything\n * needsItsOwnCache should be used when the object drawing method requires\n * a cache step. None of the fabric classes requires it.\n * Generally you do not cache objects in groups because the group outside is cached.\n * Read as: cache if is needed, or if the feature is enabled but we are not already caching.\n * @return {Boolean}\n */\n shouldCache: function () {\n this.ownCaching = this.needsItsOwnCache() || this.objectCaching && (!this.group || !this.group.isOnACache());\n return this.ownCaching;\n },\n\n /**\n * Check if this object or a child object will cast a shadow\n * used by Group.shouldCache to know if child has a shadow recursively\n * @return {Boolean}\n */\n willDrawShadow: function () {\n return !!this.shadow && (this.shadow.offsetX !== 0 || this.shadow.offsetY !== 0);\n },\n\n /**\n * Execute the drawing operation for an object clipPath\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n drawClipPathOnCache: function (ctx) {\n var path = this.clipPath;\n ctx.save(); // DEBUG: uncomment this line, comment the following\n // ctx.globalAlpha = 0.4\n\n if (path.inverted) {\n ctx.globalCompositeOperation = 'destination-out';\n } else {\n ctx.globalCompositeOperation = 'destination-in';\n } //ctx.scale(1 / 2, 1 / 2);\n\n\n if (path.absolutePositioned) {\n var m = fabric.util.invertTransform(this.calcTransformMatrix());\n ctx.transform(m[0], m[1], m[2], m[3], m[4], m[5]);\n }\n\n path.transform(ctx);\n ctx.scale(1 / path.zoomX, 1 / path.zoomY);\n ctx.drawImage(path._cacheCanvas, -path.cacheTranslationX, -path.cacheTranslationY);\n ctx.restore();\n },\n\n /**\n * Execute the drawing operation for an object on a specified context\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n drawObject: function (ctx, forClipping) {\n var originalFill = this.fill,\n originalStroke = this.stroke;\n\n if (forClipping) {\n this.fill = 'black';\n this.stroke = '';\n\n this._setClippingProperties(ctx);\n } else {\n this._renderBackground(ctx);\n\n this._setStrokeStyles(ctx, this);\n\n this._setFillStyles(ctx, this);\n }\n\n this._render(ctx);\n\n this._drawClipPath(ctx);\n\n this.fill = originalFill;\n this.stroke = originalStroke;\n },\n _drawClipPath: function (ctx) {\n var path = this.clipPath;\n\n if (!path) {\n return;\n } // needed to setup a couple of variables\n // path canvas gets overridden with this one.\n // TODO find a better solution?\n\n\n path.canvas = this.canvas;\n path.shouldCache();\n path._transformDone = true;\n path.renderCache({\n forClipping: true\n });\n this.drawClipPathOnCache(ctx);\n },\n\n /**\n * Paint the cached copy of the object on the target context.\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n drawCacheOnCanvas: function (ctx) {\n ctx.scale(1 / this.zoomX, 1 / this.zoomY);\n ctx.drawImage(this._cacheCanvas, -this.cacheTranslationX, -this.cacheTranslationY);\n },\n\n /**\n * Check if cache is dirty\n * @param {Boolean} skipCanvas skip canvas checks because this object is painted\n * on parent canvas.\n */\n isCacheDirty: function (skipCanvas) {\n if (this.isNotVisible()) {\n return false;\n }\n\n if (this._cacheCanvas && !skipCanvas && this._updateCacheCanvas()) {\n // in this case the context is already cleared.\n return true;\n } else {\n if (this.dirty || this.clipPath && this.clipPath.absolutePositioned || this.statefullCache && this.hasStateChanged('cacheProperties')) {\n if (this._cacheCanvas && !skipCanvas) {\n var width = this.cacheWidth / this.zoomX;\n var height = this.cacheHeight / this.zoomY;\n\n this._cacheContext.clearRect(-width / 2, -height / 2, width, height);\n }\n\n return true;\n }\n }\n\n return false;\n },\n\n /**\n * Draws a background for the object big as its untransformed dimensions\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderBackground: function (ctx) {\n if (!this.backgroundColor) {\n return;\n }\n\n var dim = this._getNonTransformedDimensions();\n\n ctx.fillStyle = this.backgroundColor;\n ctx.fillRect(-dim.x / 2, -dim.y / 2, dim.x, dim.y); // if there is background color no other shadows\n // should be casted\n\n this._removeShadow(ctx);\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _setOpacity: function (ctx) {\n if (this.group && !this.group._transformDone) {\n ctx.globalAlpha = this.getObjectOpacity();\n } else {\n ctx.globalAlpha *= this.opacity;\n }\n },\n _setStrokeStyles: function (ctx, decl) {\n if (decl.stroke) {\n ctx.lineWidth = decl.strokeWidth;\n ctx.lineCap = decl.strokeLineCap;\n ctx.lineDashOffset = decl.strokeDashOffset;\n ctx.lineJoin = decl.strokeLineJoin;\n ctx.miterLimit = decl.strokeMiterLimit;\n ctx.strokeStyle = decl.stroke.toLive ? decl.stroke.toLive(ctx, this) : decl.stroke;\n }\n },\n _setFillStyles: function (ctx, decl) {\n if (decl.fill) {\n ctx.fillStyle = decl.fill.toLive ? decl.fill.toLive(ctx, this) : decl.fill;\n }\n },\n _setClippingProperties: function (ctx) {\n ctx.globalAlpha = 1;\n ctx.strokeStyle = 'transparent';\n ctx.fillStyle = '#000000';\n },\n\n /**\n * @private\n * Sets line dash\n * @param {CanvasRenderingContext2D} ctx Context to set the dash line on\n * @param {Array} dashArray array representing dashes\n * @param {Function} alternative function to call if browser does not support lineDash\n */\n _setLineDash: function (ctx, dashArray, alternative) {\n if (!dashArray || dashArray.length === 0) {\n return;\n } // Spec requires the concatenation of two copies the dash list when the number of elements is odd\n\n\n if (1 & dashArray.length) {\n dashArray.push.apply(dashArray, dashArray);\n }\n\n if (supportsLineDash) {\n ctx.setLineDash(dashArray);\n } else {\n alternative && alternative(ctx);\n }\n },\n\n /**\n * Renders controls and borders for the object\n * @param {CanvasRenderingContext2D} ctx Context to render on\n * @param {Object} [styleOverride] properties to override the object style\n */\n _renderControls: function (ctx, styleOverride) {\n var vpt = this.getViewportTransform(),\n matrix = this.calcTransformMatrix(),\n options,\n drawBorders,\n drawControls;\n styleOverride = styleOverride || {};\n drawBorders = typeof styleOverride.hasBorders !== 'undefined' ? styleOverride.hasBorders : this.hasBorders;\n drawControls = typeof styleOverride.hasControls !== 'undefined' ? styleOverride.hasControls : this.hasControls;\n matrix = fabric.util.multiplyTransformMatrices(vpt, matrix);\n options = fabric.util.qrDecompose(matrix);\n ctx.save();\n ctx.translate(options.translateX, options.translateY);\n ctx.lineWidth = 1 * this.borderScaleFactor;\n\n if (!this.group) {\n ctx.globalAlpha = this.isMoving ? this.borderOpacityWhenMoving : 1;\n }\n\n if (styleOverride.forActiveSelection) {\n ctx.rotate(degreesToRadians(options.angle));\n drawBorders && this.drawBordersInGroup(ctx, options, styleOverride);\n } else {\n ctx.rotate(degreesToRadians(this.angle));\n drawBorders && this.drawBorders(ctx, styleOverride);\n }\n\n drawControls && this.drawControls(ctx, styleOverride);\n ctx.restore();\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _setShadow: function (ctx) {\n if (!this.shadow) {\n return;\n }\n\n var shadow = this.shadow,\n canvas = this.canvas,\n scaling,\n multX = canvas && canvas.viewportTransform[0] || 1,\n multY = canvas && canvas.viewportTransform[3] || 1;\n\n if (shadow.nonScaling) {\n scaling = {\n scaleX: 1,\n scaleY: 1\n };\n } else {\n scaling = this.getObjectScaling();\n }\n\n if (canvas && canvas._isRetinaScaling()) {\n multX *= fabric.devicePixelRatio;\n multY *= fabric.devicePixelRatio;\n }\n\n ctx.shadowColor = shadow.color;\n ctx.shadowBlur = shadow.blur * fabric.browserShadowBlurConstant * (multX + multY) * (scaling.scaleX + scaling.scaleY) / 4;\n ctx.shadowOffsetX = shadow.offsetX * multX * scaling.scaleX;\n ctx.shadowOffsetY = shadow.offsetY * multY * scaling.scaleY;\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _removeShadow: function (ctx) {\n if (!this.shadow) {\n return;\n }\n\n ctx.shadowColor = '';\n ctx.shadowBlur = ctx.shadowOffsetX = ctx.shadowOffsetY = 0;\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n * @param {Object} filler fabric.Pattern or fabric.Gradient\n * @return {Object} offset.offsetX offset for text rendering\n * @return {Object} offset.offsetY offset for text rendering\n */\n _applyPatternGradientTransform: function (ctx, filler) {\n if (!filler || !filler.toLive) {\n return {\n offsetX: 0,\n offsetY: 0\n };\n }\n\n var t = filler.gradientTransform || filler.patternTransform;\n var offsetX = -this.width / 2 + filler.offsetX || 0,\n offsetY = -this.height / 2 + filler.offsetY || 0;\n\n if (filler.gradientUnits === 'percentage') {\n ctx.transform(this.width, 0, 0, this.height, offsetX, offsetY);\n } else {\n ctx.transform(1, 0, 0, 1, offsetX, offsetY);\n }\n\n if (t) {\n ctx.transform(t[0], t[1], t[2], t[3], t[4], t[5]);\n }\n\n return {\n offsetX: offsetX,\n offsetY: offsetY\n };\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderPaintInOrder: function (ctx) {\n if (this.paintFirst === 'stroke') {\n this._renderStroke(ctx);\n\n this._renderFill(ctx);\n } else {\n this._renderFill(ctx);\n\n this._renderStroke(ctx);\n }\n },\n\n /**\n * @private\n * function that actually render something on the context.\n * empty here to allow Obects to work on tests to benchmark fabric functionalites\n * not related to rendering\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _render: function ()\n /* ctx */\n {},\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderFill: function (ctx) {\n if (!this.fill) {\n return;\n }\n\n ctx.save();\n\n this._applyPatternGradientTransform(ctx, this.fill);\n\n if (this.fillRule === 'evenodd') {\n ctx.fill('evenodd');\n } else {\n ctx.fill();\n }\n\n ctx.restore();\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderStroke: function (ctx) {\n if (!this.stroke || this.strokeWidth === 0) {\n return;\n }\n\n if (this.shadow && !this.shadow.affectStroke) {\n this._removeShadow(ctx);\n }\n\n ctx.save();\n\n if (this.strokeUniform && this.group) {\n var scaling = this.getObjectScaling();\n ctx.scale(1 / scaling.scaleX, 1 / scaling.scaleY);\n } else if (this.strokeUniform) {\n ctx.scale(1 / this.scaleX, 1 / this.scaleY);\n }\n\n this._setLineDash(ctx, this.strokeDashArray, this._renderDashedStroke);\n\n if (this.stroke.toLive && this.stroke.gradientUnits === 'percentage') {\n // need to transform gradient in a pattern.\n // this is a slow process. If you are hitting this codepath, and the object\n // is not using caching, you should consider switching it on.\n // we need a canvas as big as the current object caching canvas.\n this._applyPatternForTransformedGradient(ctx, this.stroke);\n } else {\n this._applyPatternGradientTransform(ctx, this.stroke);\n }\n\n ctx.stroke();\n ctx.restore();\n },\n\n /**\n * This function try to patch the missing gradientTransform on canvas gradients.\n * transforming a context to transform the gradient, is going to transform the stroke too.\n * we want to transform the gradient but not the stroke operation, so we create\n * a transformed gradient on a pattern and then we use the pattern instead of the gradient.\n * this method has drwabacks: is slow, is in low resolution, needs a patch for when the size\n * is limited.\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n * @param {fabric.Gradient} filler a fabric gradient instance\n */\n _applyPatternForTransformedGradient: function (ctx, filler) {\n var dims = this._limitCacheSize(this._getCacheCanvasDimensions()),\n pCanvas = fabric.util.createCanvasElement(),\n pCtx,\n retinaScaling = this.canvas.getRetinaScaling(),\n width = dims.x / this.scaleX / retinaScaling,\n height = dims.y / this.scaleY / retinaScaling;\n\n pCanvas.width = width;\n pCanvas.height = height;\n pCtx = pCanvas.getContext('2d');\n pCtx.beginPath();\n pCtx.moveTo(0, 0);\n pCtx.lineTo(width, 0);\n pCtx.lineTo(width, height);\n pCtx.lineTo(0, height);\n pCtx.closePath();\n pCtx.translate(width / 2, height / 2);\n pCtx.scale(dims.zoomX / this.scaleX / retinaScaling, dims.zoomY / this.scaleY / retinaScaling);\n\n this._applyPatternGradientTransform(pCtx, filler);\n\n pCtx.fillStyle = filler.toLive(ctx);\n pCtx.fill();\n ctx.translate(-this.width / 2 - this.strokeWidth / 2, -this.height / 2 - this.strokeWidth / 2);\n ctx.scale(retinaScaling * this.scaleX / dims.zoomX, retinaScaling * this.scaleY / dims.zoomY);\n ctx.strokeStyle = pCtx.createPattern(pCanvas, 'no-repeat');\n },\n\n /**\n * This function is an helper for svg import. it returns the center of the object in the svg\n * untransformed coordinates\n * @private\n * @return {Object} center point from element coordinates\n */\n _findCenterFromElement: function () {\n return {\n x: this.left + this.width / 2,\n y: this.top + this.height / 2\n };\n },\n\n /**\n * This function is an helper for svg import. it decompose the transformMatrix\n * and assign properties to object.\n * untransformed coordinates\n * @private\n * @chainable\n */\n _assignTransformMatrixProps: function () {\n if (this.transformMatrix) {\n var options = fabric.util.qrDecompose(this.transformMatrix);\n this.flipX = false;\n this.flipY = false;\n this.set('scaleX', options.scaleX);\n this.set('scaleY', options.scaleY);\n this.angle = options.angle;\n this.skewX = options.skewX;\n this.skewY = 0;\n }\n },\n\n /**\n * This function is an helper for svg import. it removes the transform matrix\n * and set to object properties that fabricjs can handle\n * @private\n * @param {Object} preserveAspectRatioOptions\n * @return {thisArg}\n */\n _removeTransformMatrix: function (preserveAspectRatioOptions) {\n var center = this._findCenterFromElement();\n\n if (this.transformMatrix) {\n this._assignTransformMatrixProps();\n\n center = fabric.util.transformPoint(center, this.transformMatrix);\n }\n\n this.transformMatrix = null;\n\n if (preserveAspectRatioOptions) {\n this.scaleX *= preserveAspectRatioOptions.scaleX;\n this.scaleY *= preserveAspectRatioOptions.scaleY;\n this.cropX = preserveAspectRatioOptions.cropX;\n this.cropY = preserveAspectRatioOptions.cropY;\n center.x += preserveAspectRatioOptions.offsetLeft;\n center.y += preserveAspectRatioOptions.offsetTop;\n this.width = preserveAspectRatioOptions.width;\n this.height = preserveAspectRatioOptions.height;\n }\n\n this.setPositionByOrigin(center, 'center', 'center');\n },\n\n /**\n * Clones an instance, using a callback method will work for every object.\n * @param {Function} callback Callback is invoked with a clone as a first argument\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n */\n clone: function (callback, propertiesToInclude) {\n var objectForm = this.toObject(propertiesToInclude);\n\n if (this.constructor.fromObject) {\n this.constructor.fromObject(objectForm, callback);\n } else {\n fabric.Object._fromObject('Object', objectForm, callback);\n }\n },\n\n /**\n * Creates an instance of fabric.Image out of an object\n * could make use of both toDataUrl or toCanvasElement.\n * @param {Function} callback callback, invoked with an instance as a first argument\n * @param {Object} [options] for clone as image, passed to toDataURL\n * @param {String} [options.format=png] The format of the output image. Either \"jpeg\" or \"png\"\n * @param {Number} [options.quality=1] Quality level (0..1). Only used for jpeg.\n * @param {Number} [options.multiplier=1] Multiplier to scale by\n * @param {Number} [options.left] Cropping left offset. Introduced in v1.2.14\n * @param {Number} [options.top] Cropping top offset. Introduced in v1.2.14\n * @param {Number} [options.width] Cropping width. Introduced in v1.2.14\n * @param {Number} [options.height] Cropping height. Introduced in v1.2.14\n * @param {Boolean} [options.enableRetinaScaling] Enable retina scaling for clone image. Introduce in 1.6.4\n * @param {Boolean} [options.withoutTransform] Remove current object transform ( no scale , no angle, no flip, no skew ). Introduced in 2.3.4\n * @param {Boolean} [options.withoutShadow] Remove current object shadow. Introduced in 2.4.2\n * @return {fabric.Object} thisArg\n */\n cloneAsImage: function (callback, options) {\n var canvasEl = this.toCanvasElement(options);\n\n if (callback) {\n callback(new fabric.Image(canvasEl));\n }\n\n return this;\n },\n\n /**\n * Converts an object into a HTMLCanvas element\n * @param {Object} options Options object\n * @param {Number} [options.multiplier=1] Multiplier to scale by\n * @param {Number} [options.left] Cropping left offset. Introduced in v1.2.14\n * @param {Number} [options.top] Cropping top offset. Introduced in v1.2.14\n * @param {Number} [options.width] Cropping width. Introduced in v1.2.14\n * @param {Number} [options.height] Cropping height. Introduced in v1.2.14\n * @param {Boolean} [options.enableRetinaScaling] Enable retina scaling for clone image. Introduce in 1.6.4\n * @param {Boolean} [options.withoutTransform] Remove current object transform ( no scale , no angle, no flip, no skew ). Introduced in 2.3.4\n * @param {Boolean} [options.withoutShadow] Remove current object shadow. Introduced in 2.4.2\n * @return {HTMLCanvasElement} Returns DOM element <canvas> with the fabric.Object\n */\n toCanvasElement: function (options) {\n options || (options = {});\n var utils = fabric.util,\n origParams = utils.saveObjectTransform(this),\n originalGroup = this.group,\n originalShadow = this.shadow,\n abs = Math.abs,\n multiplier = (options.multiplier || 1) * (options.enableRetinaScaling ? fabric.devicePixelRatio : 1);\n delete this.group;\n\n if (options.withoutTransform) {\n utils.resetObjectTransform(this);\n }\n\n if (options.withoutShadow) {\n this.shadow = null;\n }\n\n var el = fabric.util.createCanvasElement(),\n // skip canvas zoom and calculate with setCoords now.\n boundingRect = this.getBoundingRect(true, true),\n shadow = this.shadow,\n scaling,\n shadowOffset = {\n x: 0,\n y: 0\n },\n shadowBlur,\n width,\n height;\n\n if (shadow) {\n shadowBlur = shadow.blur;\n\n if (shadow.nonScaling) {\n scaling = {\n scaleX: 1,\n scaleY: 1\n };\n } else {\n scaling = this.getObjectScaling();\n } // consider non scaling shadow.\n\n\n shadowOffset.x = 2 * Math.round(abs(shadow.offsetX) + shadowBlur) * abs(scaling.scaleX);\n shadowOffset.y = 2 * Math.round(abs(shadow.offsetY) + shadowBlur) * abs(scaling.scaleY);\n }\n\n width = boundingRect.width + shadowOffset.x;\n height = boundingRect.height + shadowOffset.y; // if the current width/height is not an integer\n // we need to make it so.\n\n el.width = Math.ceil(width);\n el.height = Math.ceil(height);\n var canvas = new fabric.StaticCanvas(el, {\n enableRetinaScaling: false,\n renderOnAddRemove: false,\n skipOffscreen: false\n });\n\n if (options.format === 'jpeg') {\n canvas.backgroundColor = '#fff';\n }\n\n this.setPositionByOrigin(new fabric.Point(canvas.width / 2, canvas.height / 2), 'center', 'center');\n var originalCanvas = this.canvas;\n canvas.add(this);\n var canvasEl = canvas.toCanvasElement(multiplier || 1, options);\n this.shadow = originalShadow;\n this.set('canvas', originalCanvas);\n\n if (originalGroup) {\n this.group = originalGroup;\n }\n\n this.set(origParams).setCoords(); // canvas.dispose will call image.dispose that will nullify the elements\n // since this canvas is a simple element for the process, we remove references\n // to objects in this way in order to avoid object trashing.\n\n canvas._objects = [];\n canvas.dispose();\n canvas = null;\n return canvasEl;\n },\n\n /**\n * Converts an object into a data-url-like string\n * @param {Object} options Options object\n * @param {String} [options.format=png] The format of the output image. Either \"jpeg\" or \"png\"\n * @param {Number} [options.quality=1] Quality level (0..1). Only used for jpeg.\n * @param {Number} [options.multiplier=1] Multiplier to scale by\n * @param {Number} [options.left] Cropping left offset. Introduced in v1.2.14\n * @param {Number} [options.top] Cropping top offset. Introduced in v1.2.14\n * @param {Number} [options.width] Cropping width. Introduced in v1.2.14\n * @param {Number} [options.height] Cropping height. Introduced in v1.2.14\n * @param {Boolean} [options.enableRetinaScaling] Enable retina scaling for clone image. Introduce in 1.6.4\n * @param {Boolean} [options.withoutTransform] Remove current object transform ( no scale , no angle, no flip, no skew ). Introduced in 2.3.4\n * @param {Boolean} [options.withoutShadow] Remove current object shadow. Introduced in 2.4.2\n * @return {String} Returns a data: URL containing a representation of the object in the format specified by options.format\n */\n toDataURL: function (options) {\n options || (options = {});\n return fabric.util.toDataURL(this.toCanvasElement(options), options.format || 'png', options.quality || 1);\n },\n\n /**\n * Returns true if specified type is identical to the type of an instance\n * @param {String} type Type to check against\n * @return {Boolean}\n */\n isType: function (type) {\n return this.type === type;\n },\n\n /**\n * Returns complexity of an instance\n * @return {Number} complexity of this instance (is 1 unless subclassed)\n */\n complexity: function () {\n return 1;\n },\n\n /**\n * Returns a JSON representation of an instance\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} JSON\n */\n toJSON: function (propertiesToInclude) {\n // delegate, not alias\n return this.toObject(propertiesToInclude);\n },\n\n /**\n * Sets \"angle\" of an instance with centered rotation\n * @param {Number} angle Angle value (in degrees)\n * @return {fabric.Object} thisArg\n * @chainable\n */\n rotate: function (angle) {\n var shouldCenterOrigin = (this.originX !== 'center' || this.originY !== 'center') && this.centeredRotation;\n\n if (shouldCenterOrigin) {\n this._setOriginToCenter();\n }\n\n this.set('angle', angle);\n\n if (shouldCenterOrigin) {\n this._resetOrigin();\n }\n\n return this;\n },\n\n /**\n * Centers object horizontally on canvas to which it was added last.\n * You might need to call `setCoords` on an object after centering, to update controls area.\n * @return {fabric.Object} thisArg\n * @chainable\n */\n centerH: function () {\n this.canvas && this.canvas.centerObjectH(this);\n return this;\n },\n\n /**\n * Centers object horizontally on current viewport of canvas to which it was added last.\n * You might need to call `setCoords` on an object after centering, to update controls area.\n * @return {fabric.Object} thisArg\n * @chainable\n */\n viewportCenterH: function () {\n this.canvas && this.canvas.viewportCenterObjectH(this);\n return this;\n },\n\n /**\n * Centers object vertically on canvas to which it was added last.\n * You might need to call `setCoords` on an object after centering, to update controls area.\n * @return {fabric.Object} thisArg\n * @chainable\n */\n centerV: function () {\n this.canvas && this.canvas.centerObjectV(this);\n return this;\n },\n\n /**\n * Centers object vertically on current viewport of canvas to which it was added last.\n * You might need to call `setCoords` on an object after centering, to update controls area.\n * @return {fabric.Object} thisArg\n * @chainable\n */\n viewportCenterV: function () {\n this.canvas && this.canvas.viewportCenterObjectV(this);\n return this;\n },\n\n /**\n * Centers object vertically and horizontally on canvas to which is was added last\n * You might need to call `setCoords` on an object after centering, to update controls area.\n * @return {fabric.Object} thisArg\n * @chainable\n */\n center: function () {\n this.canvas && this.canvas.centerObject(this);\n return this;\n },\n\n /**\n * Centers object on current viewport of canvas to which it was added last.\n * You might need to call `setCoords` on an object after centering, to update controls area.\n * @return {fabric.Object} thisArg\n * @chainable\n */\n viewportCenter: function () {\n this.canvas && this.canvas.viewportCenterObject(this);\n return this;\n },\n\n /**\n * Returns coordinates of a pointer relative to an object\n * @param {Event} e Event to operate upon\n * @param {Object} [pointer] Pointer to operate upon (instead of event)\n * @return {Object} Coordinates of a pointer (x, y)\n */\n getLocalPointer: function (e, pointer) {\n pointer = pointer || this.canvas.getPointer(e);\n\n var pClicked = new fabric.Point(pointer.x, pointer.y),\n objectLeftTop = this._getLeftTopCoords();\n\n if (this.angle) {\n pClicked = fabric.util.rotatePoint(pClicked, objectLeftTop, degreesToRadians(-this.angle));\n }\n\n return {\n x: pClicked.x - objectLeftTop.x,\n y: pClicked.y - objectLeftTop.y\n };\n },\n\n /**\n * Sets canvas globalCompositeOperation for specific object\n * custom composition operation for the particular object can be specified using globalCompositeOperation property\n * @param {CanvasRenderingContext2D} ctx Rendering canvas context\n */\n _setupCompositeOperation: function (ctx) {\n if (this.globalCompositeOperation) {\n ctx.globalCompositeOperation = this.globalCompositeOperation;\n }\n }\n });\n fabric.util.createAccessors && fabric.util.createAccessors(fabric.Object);\n extend(fabric.Object.prototype, fabric.Observable);\n /**\n * Defines the number of fraction digits to use when serializing object values.\n * You can use it to increase/decrease precision of such values like left, top, scaleX, scaleY, etc.\n * @static\n * @memberOf fabric.Object\n * @constant\n * @type Number\n */\n\n fabric.Object.NUM_FRACTION_DIGITS = 2;\n\n fabric.Object._fromObject = function (className, object, callback, extraParam) {\n var klass = fabric[className];\n object = clone(object, true);\n fabric.util.enlivenPatterns([object.fill, object.stroke], function (patterns) {\n if (typeof patterns[0] !== 'undefined') {\n object.fill = patterns[0];\n }\n\n if (typeof patterns[1] !== 'undefined') {\n object.stroke = patterns[1];\n }\n\n fabric.util.enlivenObjects([object.clipPath], function (enlivedProps) {\n object.clipPath = enlivedProps[0];\n var instance = extraParam ? new klass(object[extraParam], object) : new klass(object);\n callback && callback(instance);\n });\n });\n };\n /**\n * Unique id used internally when creating SVG elements\n * @static\n * @memberOf fabric.Object\n * @type Number\n */\n\n\n fabric.Object.__uid = 0;\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function () {\n var degreesToRadians = fabric.util.degreesToRadians,\n originXOffset = {\n left: -0.5,\n center: 0,\n right: 0.5\n },\n originYOffset = {\n top: -0.5,\n center: 0,\n bottom: 0.5\n };\n fabric.util.object.extend(fabric.Object.prototype,\n /** @lends fabric.Object.prototype */\n {\n /**\n * Translates the coordinates from a set of origin to another (based on the object's dimensions)\n * @param {fabric.Point} point The point which corresponds to the originX and originY params\n * @param {String} fromOriginX Horizontal origin: 'left', 'center' or 'right'\n * @param {String} fromOriginY Vertical origin: 'top', 'center' or 'bottom'\n * @param {String} toOriginX Horizontal origin: 'left', 'center' or 'right'\n * @param {String} toOriginY Vertical origin: 'top', 'center' or 'bottom'\n * @return {fabric.Point}\n */\n translateToGivenOrigin: function (point, fromOriginX, fromOriginY, toOriginX, toOriginY) {\n var x = point.x,\n y = point.y,\n offsetX,\n offsetY,\n dim;\n\n if (typeof fromOriginX === 'string') {\n fromOriginX = originXOffset[fromOriginX];\n } else {\n fromOriginX -= 0.5;\n }\n\n if (typeof toOriginX === 'string') {\n toOriginX = originXOffset[toOriginX];\n } else {\n toOriginX -= 0.5;\n }\n\n offsetX = toOriginX - fromOriginX;\n\n if (typeof fromOriginY === 'string') {\n fromOriginY = originYOffset[fromOriginY];\n } else {\n fromOriginY -= 0.5;\n }\n\n if (typeof toOriginY === 'string') {\n toOriginY = originYOffset[toOriginY];\n } else {\n toOriginY -= 0.5;\n }\n\n offsetY = toOriginY - fromOriginY;\n\n if (offsetX || offsetY) {\n dim = this._getTransformedDimensions();\n x = point.x + offsetX * dim.x;\n y = point.y + offsetY * dim.y;\n }\n\n return new fabric.Point(x, y);\n },\n\n /**\n * Translates the coordinates from origin to center coordinates (based on the object's dimensions)\n * @param {fabric.Point} point The point which corresponds to the originX and originY params\n * @param {String} originX Horizontal origin: 'left', 'center' or 'right'\n * @param {String} originY Vertical origin: 'top', 'center' or 'bottom'\n * @return {fabric.Point}\n */\n translateToCenterPoint: function (point, originX, originY) {\n var p = this.translateToGivenOrigin(point, originX, originY, 'center', 'center');\n\n if (this.angle) {\n return fabric.util.rotatePoint(p, point, degreesToRadians(this.angle));\n }\n\n return p;\n },\n\n /**\n * Translates the coordinates from center to origin coordinates (based on the object's dimensions)\n * @param {fabric.Point} center The point which corresponds to center of the object\n * @param {String} originX Horizontal origin: 'left', 'center' or 'right'\n * @param {String} originY Vertical origin: 'top', 'center' or 'bottom'\n * @return {fabric.Point}\n */\n translateToOriginPoint: function (center, originX, originY) {\n var p = this.translateToGivenOrigin(center, 'center', 'center', originX, originY);\n\n if (this.angle) {\n return fabric.util.rotatePoint(p, center, degreesToRadians(this.angle));\n }\n\n return p;\n },\n\n /**\n * Returns the real center coordinates of the object\n * @return {fabric.Point}\n */\n getCenterPoint: function () {\n var leftTop = new fabric.Point(this.left, this.top);\n return this.translateToCenterPoint(leftTop, this.originX, this.originY);\n },\n\n /**\n * Returns the coordinates of the object based on center coordinates\n * @param {fabric.Point} point The point which corresponds to the originX and originY params\n * @return {fabric.Point}\n */\n // getOriginPoint: function(center) {\n // return this.translateToOriginPoint(center, this.originX, this.originY);\n // },\n\n /**\n * Returns the coordinates of the object as if it has a different origin\n * @param {String} originX Horizontal origin: 'left', 'center' or 'right'\n * @param {String} originY Vertical origin: 'top', 'center' or 'bottom'\n * @return {fabric.Point}\n */\n getPointByOrigin: function (originX, originY) {\n var center = this.getCenterPoint();\n return this.translateToOriginPoint(center, originX, originY);\n },\n\n /**\n * Returns the point in local coordinates\n * @param {fabric.Point} point The point relative to the global coordinate system\n * @param {String} originX Horizontal origin: 'left', 'center' or 'right'\n * @param {String} originY Vertical origin: 'top', 'center' or 'bottom'\n * @return {fabric.Point}\n */\n toLocalPoint: function (point, originX, originY) {\n var center = this.getCenterPoint(),\n p,\n p2;\n\n if (typeof originX !== 'undefined' && typeof originY !== 'undefined') {\n p = this.translateToGivenOrigin(center, 'center', 'center', originX, originY);\n } else {\n p = new fabric.Point(this.left, this.top);\n }\n\n p2 = new fabric.Point(point.x, point.y);\n\n if (this.angle) {\n p2 = fabric.util.rotatePoint(p2, center, -degreesToRadians(this.angle));\n }\n\n return p2.subtractEquals(p);\n },\n\n /**\n * Returns the point in global coordinates\n * @param {fabric.Point} The point relative to the local coordinate system\n * @return {fabric.Point}\n */\n // toGlobalPoint: function(point) {\n // return fabric.util.rotatePoint(point, this.getCenterPoint(), degreesToRadians(this.angle)).addEquals(new fabric.Point(this.left, this.top));\n // },\n\n /**\n * Sets the position of the object taking into consideration the object's origin\n * @param {fabric.Point} pos The new position of the object\n * @param {String} originX Horizontal origin: 'left', 'center' or 'right'\n * @param {String} originY Vertical origin: 'top', 'center' or 'bottom'\n * @return {void}\n */\n setPositionByOrigin: function (pos, originX, originY) {\n var center = this.translateToCenterPoint(pos, originX, originY),\n position = this.translateToOriginPoint(center, this.originX, this.originY);\n this.set('left', position.x);\n this.set('top', position.y);\n },\n\n /**\n * @param {String} to One of 'left', 'center', 'right'\n */\n adjustPosition: function (to) {\n var angle = degreesToRadians(this.angle),\n hypotFull = this.getScaledWidth(),\n xFull = fabric.util.cos(angle) * hypotFull,\n yFull = fabric.util.sin(angle) * hypotFull,\n offsetFrom,\n offsetTo; //TODO: this function does not consider mixed situation like top, center.\n\n if (typeof this.originX === 'string') {\n offsetFrom = originXOffset[this.originX];\n } else {\n offsetFrom = this.originX - 0.5;\n }\n\n if (typeof to === 'string') {\n offsetTo = originXOffset[to];\n } else {\n offsetTo = to - 0.5;\n }\n\n this.left += xFull * (offsetTo - offsetFrom);\n this.top += yFull * (offsetTo - offsetFrom);\n this.setCoords();\n this.originX = to;\n },\n\n /**\n * Sets the origin/position of the object to it's center point\n * @private\n * @return {void}\n */\n _setOriginToCenter: function () {\n this._originalOriginX = this.originX;\n this._originalOriginY = this.originY;\n var center = this.getCenterPoint();\n this.originX = 'center';\n this.originY = 'center';\n this.left = center.x;\n this.top = center.y;\n },\n\n /**\n * Resets the origin/position of the object to it's original origin\n * @private\n * @return {void}\n */\n _resetOrigin: function () {\n var originPoint = this.translateToOriginPoint(this.getCenterPoint(), this._originalOriginX, this._originalOriginY);\n this.originX = this._originalOriginX;\n this.originY = this._originalOriginY;\n this.left = originPoint.x;\n this.top = originPoint.y;\n this._originalOriginX = null;\n this._originalOriginY = null;\n },\n\n /**\n * @private\n */\n _getLeftTopCoords: function () {\n return this.translateToOriginPoint(this.getCenterPoint(), 'left', 'top');\n }\n });\n})();\n\n(function () {\n function arrayFromCoords(coords) {\n return [new fabric.Point(coords.tl.x, coords.tl.y), new fabric.Point(coords.tr.x, coords.tr.y), new fabric.Point(coords.br.x, coords.br.y), new fabric.Point(coords.bl.x, coords.bl.y)];\n }\n\n var util = fabric.util,\n degreesToRadians = util.degreesToRadians,\n multiplyMatrices = util.multiplyTransformMatrices,\n transformPoint = util.transformPoint;\n util.object.extend(fabric.Object.prototype,\n /** @lends fabric.Object.prototype */\n {\n /**\n * Describe object's corner position in canvas element coordinates.\n * properties are depending on control keys and padding the main controls.\n * each property is an object with x, y and corner.\n * The `corner` property contains in a similar manner the 4 points of the\n * interactive area of the corner.\n * The coordinates depends from the controls positionHandler and are used\n * to draw and locate controls\n * @memberOf fabric.Object.prototype\n */\n oCoords: null,\n\n /**\n * Describe object's corner position in canvas object absolute coordinates\n * properties are tl,tr,bl,br and describe the four main corner.\n * each property is an object with x, y, instance of Fabric.Point.\n * The coordinates depends from this properties: width, height, scaleX, scaleY\n * skewX, skewY, angle, strokeWidth, top, left.\n * Those coordinates are useful to understand where an object is. They get updated\n * with oCoords but they do not need to be updated when zoom or panning change.\n * The coordinates get updated with @method setCoords.\n * You can calculate them without updating with @method calcACoords();\n * @memberOf fabric.Object.prototype\n */\n aCoords: null,\n\n /**\n * Describe object's corner position in canvas element coordinates.\n * includes padding. Used of object detection.\n * set and refreshed with setCoords and calcCoords.\n * @memberOf fabric.Object.prototype\n */\n lineCoords: null,\n\n /**\n * storage for object transform matrix\n */\n ownMatrixCache: null,\n\n /**\n * storage for object full transform matrix\n */\n matrixCache: null,\n\n /**\n * custom controls interface\n * controls are added by default_controls.js\n */\n controls: {},\n\n /**\n * return correct set of coordinates for intersection\n * this will return either aCoords or lineCoords.\n * @param {Boolean} absolute will return aCoords if true or lineCoords\n * @return {Object} {tl, tr, br, bl} points\n */\n _getCoords: function (absolute, calculate) {\n if (calculate) {\n return absolute ? this.calcACoords() : this.calcLineCoords();\n }\n\n if (!this.aCoords || !this.lineCoords) {\n this.setCoords(true);\n }\n\n return absolute ? this.aCoords : this.lineCoords;\n },\n\n /**\n * return correct set of coordinates for intersection\n * this will return either aCoords or lineCoords.\n * The coords are returned in an array.\n * @return {Array} [tl, tr, br, bl] of points\n */\n getCoords: function (absolute, calculate) {\n return arrayFromCoords(this._getCoords(absolute, calculate));\n },\n\n /**\n * Checks if object intersects with an area formed by 2 points\n * @param {Object} pointTL top-left point of area\n * @param {Object} pointBR bottom-right point of area\n * @param {Boolean} [absolute] use coordinates without viewportTransform\n * @param {Boolean} [calculate] use coordinates of current position instead of .oCoords\n * @return {Boolean} true if object intersects with an area formed by 2 points\n */\n intersectsWithRect: function (pointTL, pointBR, absolute, calculate) {\n var coords = this.getCoords(absolute, calculate),\n intersection = fabric.Intersection.intersectPolygonRectangle(coords, pointTL, pointBR);\n return intersection.status === 'Intersection';\n },\n\n /**\n * Checks if object intersects with another object\n * @param {Object} other Object to test\n * @param {Boolean} [absolute] use coordinates without viewportTransform\n * @param {Boolean} [calculate] use coordinates of current position instead of .oCoords\n * @return {Boolean} true if object intersects with another object\n */\n intersectsWithObject: function (other, absolute, calculate) {\n var intersection = fabric.Intersection.intersectPolygonPolygon(this.getCoords(absolute, calculate), other.getCoords(absolute, calculate));\n return intersection.status === 'Intersection' || other.isContainedWithinObject(this, absolute, calculate) || this.isContainedWithinObject(other, absolute, calculate);\n },\n\n /**\n * Checks if object is fully contained within area of another object\n * @param {Object} other Object to test\n * @param {Boolean} [absolute] use coordinates without viewportTransform\n * @param {Boolean} [calculate] use coordinates of current position instead of .oCoords\n * @return {Boolean} true if object is fully contained within area of another object\n */\n isContainedWithinObject: function (other, absolute, calculate) {\n var points = this.getCoords(absolute, calculate),\n otherCoords = absolute ? other.aCoords : other.lineCoords,\n i = 0,\n lines = other._getImageLines(otherCoords);\n\n for (; i < 4; i++) {\n if (!other.containsPoint(points[i], lines)) {\n return false;\n }\n }\n\n return true;\n },\n\n /**\n * Checks if object is fully contained within area formed by 2 points\n * @param {Object} pointTL top-left point of area\n * @param {Object} pointBR bottom-right point of area\n * @param {Boolean} [absolute] use coordinates without viewportTransform\n * @param {Boolean} [calculate] use coordinates of current position instead of .oCoords\n * @return {Boolean} true if object is fully contained within area formed by 2 points\n */\n isContainedWithinRect: function (pointTL, pointBR, absolute, calculate) {\n var boundingRect = this.getBoundingRect(absolute, calculate);\n return boundingRect.left >= pointTL.x && boundingRect.left + boundingRect.width <= pointBR.x && boundingRect.top >= pointTL.y && boundingRect.top + boundingRect.height <= pointBR.y;\n },\n\n /**\n * Checks if point is inside the object\n * @param {fabric.Point} point Point to check against\n * @param {Object} [lines] object returned from @method _getImageLines\n * @param {Boolean} [absolute] use coordinates without viewportTransform\n * @param {Boolean} [calculate] use coordinates of current position instead of .oCoords\n * @return {Boolean} true if point is inside the object\n */\n containsPoint: function (point, lines, absolute, calculate) {\n var coords = this._getCoords(absolute, calculate),\n lines = lines || this._getImageLines(coords),\n xPoints = this._findCrossPoints(point, lines); // if xPoints is odd then point is inside the object\n\n\n return xPoints !== 0 && xPoints % 2 === 1;\n },\n\n /**\n * Checks if object is contained within the canvas with current viewportTransform\n * the check is done stopping at first point that appears on screen\n * @param {Boolean} [calculate] use coordinates of current position instead of .aCoords\n * @return {Boolean} true if object is fully or partially contained within canvas\n */\n isOnScreen: function (calculate) {\n if (!this.canvas) {\n return false;\n }\n\n var pointTL = this.canvas.vptCoords.tl,\n pointBR = this.canvas.vptCoords.br;\n var points = this.getCoords(true, calculate); // if some point is on screen, the object is on screen.\n\n if (points.some(function (point) {\n return point.x <= pointBR.x && point.x >= pointTL.x && point.y <= pointBR.y && point.y >= pointTL.y;\n })) {\n return true;\n } // no points on screen, check intersection with absolute coordinates\n\n\n if (this.intersectsWithRect(pointTL, pointBR, true, calculate)) {\n return true;\n }\n\n return this._containsCenterOfCanvas(pointTL, pointBR, calculate);\n },\n\n /**\n * Checks if the object contains the midpoint between canvas extremities\n * Does not make sense outside the context of isOnScreen and isPartiallyOnScreen\n * @private\n * @param {Fabric.Point} pointTL Top Left point\n * @param {Fabric.Point} pointBR Top Right point\n * @param {Boolean} calculate use coordinates of current position instead of .oCoords\n * @return {Boolean} true if the object contains the point\n */\n _containsCenterOfCanvas: function (pointTL, pointBR, calculate) {\n // worst case scenario the object is so big that contains the screen\n var centerPoint = {\n x: (pointTL.x + pointBR.x) / 2,\n y: (pointTL.y + pointBR.y) / 2\n };\n\n if (this.containsPoint(centerPoint, null, true, calculate)) {\n return true;\n }\n\n return false;\n },\n\n /**\n * Checks if object is partially contained within the canvas with current viewportTransform\n * @param {Boolean} [calculate] use coordinates of current position instead of .oCoords\n * @return {Boolean} true if object is partially contained within canvas\n */\n isPartiallyOnScreen: function (calculate) {\n if (!this.canvas) {\n return false;\n }\n\n var pointTL = this.canvas.vptCoords.tl,\n pointBR = this.canvas.vptCoords.br;\n\n if (this.intersectsWithRect(pointTL, pointBR, true, calculate)) {\n return true;\n }\n\n var allPointsAreOutside = this.getCoords(true, calculate).every(function (point) {\n return (point.x >= pointBR.x || point.x <= pointTL.x) && (point.y >= pointBR.y || point.y <= pointTL.y);\n });\n return allPointsAreOutside && this._containsCenterOfCanvas(pointTL, pointBR, calculate);\n },\n\n /**\n * Method that returns an object with the object edges in it, given the coordinates of the corners\n * @private\n * @param {Object} oCoords Coordinates of the object corners\n */\n _getImageLines: function (oCoords) {\n var lines = {\n topline: {\n o: oCoords.tl,\n d: oCoords.tr\n },\n rightline: {\n o: oCoords.tr,\n d: oCoords.br\n },\n bottomline: {\n o: oCoords.br,\n d: oCoords.bl\n },\n leftline: {\n o: oCoords.bl,\n d: oCoords.tl\n }\n }; // // debugging\n // if (this.canvas.contextTop) {\n // this.canvas.contextTop.fillRect(lines.bottomline.d.x, lines.bottomline.d.y, 2, 2);\n // this.canvas.contextTop.fillRect(lines.bottomline.o.x, lines.bottomline.o.y, 2, 2);\n //\n // this.canvas.contextTop.fillRect(lines.leftline.d.x, lines.leftline.d.y, 2, 2);\n // this.canvas.contextTop.fillRect(lines.leftline.o.x, lines.leftline.o.y, 2, 2);\n //\n // this.canvas.contextTop.fillRect(lines.topline.d.x, lines.topline.d.y, 2, 2);\n // this.canvas.contextTop.fillRect(lines.topline.o.x, lines.topline.o.y, 2, 2);\n //\n // this.canvas.contextTop.fillRect(lines.rightline.d.x, lines.rightline.d.y, 2, 2);\n // this.canvas.contextTop.fillRect(lines.rightline.o.x, lines.rightline.o.y, 2, 2);\n // }\n\n return lines;\n },\n\n /**\n * Helper method to determine how many cross points are between the 4 object edges\n * and the horizontal line determined by a point on canvas\n * @private\n * @param {fabric.Point} point Point to check\n * @param {Object} lines Coordinates of the object being evaluated\n */\n // remove yi, not used but left code here just in case.\n _findCrossPoints: function (point, lines) {\n var b1,\n b2,\n a1,\n a2,\n xi,\n // yi,\n xcount = 0,\n iLine;\n\n for (var lineKey in lines) {\n iLine = lines[lineKey]; // optimisation 1: line below point. no cross\n\n if (iLine.o.y < point.y && iLine.d.y < point.y) {\n continue;\n } // optimisation 2: line above point. no cross\n\n\n if (iLine.o.y >= point.y && iLine.d.y >= point.y) {\n continue;\n } // optimisation 3: vertical line case\n\n\n if (iLine.o.x === iLine.d.x && iLine.o.x >= point.x) {\n xi = iLine.o.x; // yi = point.y;\n } // calculate the intersection point\n else {\n b1 = 0;\n b2 = (iLine.d.y - iLine.o.y) / (iLine.d.x - iLine.o.x);\n a1 = point.y - b1 * point.x;\n a2 = iLine.o.y - b2 * iLine.o.x;\n xi = -(a1 - a2) / (b1 - b2); // yi = a1 + b1 * xi;\n } // dont count xi < point.x cases\n\n\n if (xi >= point.x) {\n xcount += 1;\n } // optimisation 4: specific for square images\n\n\n if (xcount === 2) {\n break;\n }\n }\n\n return xcount;\n },\n\n /**\n * Returns coordinates of object's bounding rectangle (left, top, width, height)\n * the box is intended as aligned to axis of canvas.\n * @param {Boolean} [absolute] use coordinates without viewportTransform\n * @param {Boolean} [calculate] use coordinates of current position instead of .oCoords / .aCoords\n * @return {Object} Object with left, top, width, height properties\n */\n getBoundingRect: function (absolute, calculate) {\n var coords = this.getCoords(absolute, calculate);\n return util.makeBoundingBoxFromPoints(coords);\n },\n\n /**\n * Returns width of an object's bounding box counting transformations\n * before 2.0 it was named getWidth();\n * @return {Number} width value\n */\n getScaledWidth: function () {\n return this._getTransformedDimensions().x;\n },\n\n /**\n * Returns height of an object bounding box counting transformations\n * before 2.0 it was named getHeight();\n * @return {Number} height value\n */\n getScaledHeight: function () {\n return this._getTransformedDimensions().y;\n },\n\n /**\n * Makes sure the scale is valid and modifies it if necessary\n * @private\n * @param {Number} value\n * @return {Number}\n */\n _constrainScale: function (value) {\n if (Math.abs(value) < this.minScaleLimit) {\n if (value < 0) {\n return -this.minScaleLimit;\n } else {\n return this.minScaleLimit;\n }\n } else if (value === 0) {\n return 0.0001;\n }\n\n return value;\n },\n\n /**\n * Scales an object (equally by x and y)\n * @param {Number} value Scale factor\n * @return {fabric.Object} thisArg\n * @chainable\n */\n scale: function (value) {\n this._set('scaleX', value);\n\n this._set('scaleY', value);\n\n return this.setCoords();\n },\n\n /**\n * Scales an object to a given width, with respect to bounding box (scaling by x/y equally)\n * @param {Number} value New width value\n * @param {Boolean} absolute ignore viewport\n * @return {fabric.Object} thisArg\n * @chainable\n */\n scaleToWidth: function (value, absolute) {\n // adjust to bounding rect factor so that rotated shapes would fit as well\n var boundingRectFactor = this.getBoundingRect(absolute).width / this.getScaledWidth();\n return this.scale(value / this.width / boundingRectFactor);\n },\n\n /**\n * Scales an object to a given height, with respect to bounding box (scaling by x/y equally)\n * @param {Number} value New height value\n * @param {Boolean} absolute ignore viewport\n * @return {fabric.Object} thisArg\n * @chainable\n */\n scaleToHeight: function (value, absolute) {\n // adjust to bounding rect factor so that rotated shapes would fit as well\n var boundingRectFactor = this.getBoundingRect(absolute).height / this.getScaledHeight();\n return this.scale(value / this.height / boundingRectFactor);\n },\n\n /**\n * Calculates and returns the .coords of an object.\n * unused by the library, only for the end dev.\n * @return {Object} Object with tl, tr, br, bl ....\n * @chainable\n * @deprecated\n */\n calcCoords: function (absolute) {\n // this is a compatibility function to avoid removing calcCoords now.\n if (absolute) {\n return this.calcACoords();\n }\n\n return this.calcOCoords();\n },\n calcLineCoords: function () {\n var vpt = this.getViewportTransform(),\n padding = this.padding,\n angle = degreesToRadians(this.angle),\n cos = util.cos(angle),\n sin = util.sin(angle),\n cosP = cos * padding,\n sinP = sin * padding,\n cosPSinP = cosP + sinP,\n cosPMinusSinP = cosP - sinP,\n aCoords = this.calcACoords();\n var lineCoords = {\n tl: transformPoint(aCoords.tl, vpt),\n tr: transformPoint(aCoords.tr, vpt),\n bl: transformPoint(aCoords.bl, vpt),\n br: transformPoint(aCoords.br, vpt)\n };\n\n if (padding) {\n lineCoords.tl.x -= cosPMinusSinP;\n lineCoords.tl.y -= cosPSinP;\n lineCoords.tr.x += cosPSinP;\n lineCoords.tr.y -= cosPMinusSinP;\n lineCoords.bl.x -= cosPSinP;\n lineCoords.bl.y += cosPMinusSinP;\n lineCoords.br.x += cosPMinusSinP;\n lineCoords.br.y += cosPSinP;\n }\n\n return lineCoords;\n },\n calcOCoords: function () {\n var rotateMatrix = this._calcRotateMatrix(),\n translateMatrix = this._calcTranslateMatrix(),\n vpt = this.getViewportTransform(),\n startMatrix = multiplyMatrices(vpt, translateMatrix),\n finalMatrix = multiplyMatrices(startMatrix, rotateMatrix),\n finalMatrix = multiplyMatrices(finalMatrix, [1 / vpt[0], 0, 0, 1 / vpt[3], 0, 0]),\n dim = this._calculateCurrentDimensions(),\n coords = {};\n\n this.forEachControl(function (control, key, fabricObject) {\n coords[key] = control.positionHandler(dim, finalMatrix, fabricObject);\n }); // debug code\n // var canvas = this.canvas;\n // setTimeout(function() {\n // canvas.contextTop.clearRect(0, 0, 700, 700);\n // canvas.contextTop.fillStyle = 'green';\n // Object.keys(coords).forEach(function(key) {\n // var control = coords[key];\n // canvas.contextTop.fillRect(control.x, control.y, 3, 3);\n // });\n // }, 50);\n\n return coords;\n },\n calcACoords: function () {\n var rotateMatrix = this._calcRotateMatrix(),\n translateMatrix = this._calcTranslateMatrix(),\n finalMatrix = multiplyMatrices(translateMatrix, rotateMatrix),\n dim = this._getTransformedDimensions(),\n w = dim.x / 2,\n h = dim.y / 2;\n\n return {\n // corners\n tl: transformPoint({\n x: -w,\n y: -h\n }, finalMatrix),\n tr: transformPoint({\n x: w,\n y: -h\n }, finalMatrix),\n bl: transformPoint({\n x: -w,\n y: h\n }, finalMatrix),\n br: transformPoint({\n x: w,\n y: h\n }, finalMatrix)\n };\n },\n\n /**\n * Sets corner position coordinates based on current angle, width and height.\n * oCoords are used to find the corners\n * aCoords are used to quickly find an object on the canvas\n * lineCoords are used to quickly find object during pointer events.\n * See {@link https://github.com/kangax/fabric.js/wiki/When-to-call-setCoords|When-to-call-setCoords}\n * @param {Boolean} [skipCorners] skip calculation of oCoords.\n * @return {fabric.Object} thisArg\n * @chainable\n */\n setCoords: function (skipCorners) {\n this.aCoords = this.calcACoords(); // in case we are in a group, for how the inner group target check works,\n // lineCoords are exactly aCoords. Since the vpt gets absorbed by the normalized pointer.\n\n this.lineCoords = this.group ? this.aCoords : this.calcLineCoords();\n\n if (skipCorners) {\n return this;\n } // set coordinates of the draggable boxes in the corners used to scale/rotate the image\n\n\n this.oCoords = this.calcOCoords();\n this._setCornerCoords && this._setCornerCoords();\n return this;\n },\n\n /**\n * calculate rotation matrix of an object\n * @return {Array} rotation matrix for the object\n */\n _calcRotateMatrix: function () {\n return util.calcRotateMatrix(this);\n },\n\n /**\n * calculate the translation matrix for an object transform\n * @return {Array} rotation matrix for the object\n */\n _calcTranslateMatrix: function () {\n var center = this.getCenterPoint();\n return [1, 0, 0, 1, center.x, center.y];\n },\n transformMatrixKey: function (skipGroup) {\n var sep = '_',\n prefix = '';\n\n if (!skipGroup && this.group) {\n prefix = this.group.transformMatrixKey(skipGroup) + sep;\n }\n\n ;\n return prefix + this.top + sep + this.left + sep + this.scaleX + sep + this.scaleY + sep + this.skewX + sep + this.skewY + sep + this.angle + sep + this.originX + sep + this.originY + sep + this.width + sep + this.height + sep + this.strokeWidth + this.flipX + this.flipY;\n },\n\n /**\n * calculate transform matrix that represents the current transformations from the\n * object's properties.\n * @param {Boolean} [skipGroup] return transform matrix for object not counting parent transformations\n * There are some situation in which this is useful to avoid the fake rotation.\n * @return {Array} transform matrix for the object\n */\n calcTransformMatrix: function (skipGroup) {\n var matrix = this.calcOwnMatrix();\n\n if (skipGroup || !this.group) {\n return matrix;\n }\n\n var key = this.transformMatrixKey(skipGroup),\n cache = this.matrixCache || (this.matrixCache = {});\n\n if (cache.key === key) {\n return cache.value;\n }\n\n if (this.group) {\n matrix = multiplyMatrices(this.group.calcTransformMatrix(false), matrix);\n }\n\n cache.key = key;\n cache.value = matrix;\n return matrix;\n },\n\n /**\n * calculate transform matrix that represents the current transformations from the\n * object's properties, this matrix does not include the group transformation\n * @return {Array} transform matrix for the object\n */\n calcOwnMatrix: function () {\n var key = this.transformMatrixKey(true),\n cache = this.ownMatrixCache || (this.ownMatrixCache = {});\n\n if (cache.key === key) {\n return cache.value;\n }\n\n var tMatrix = this._calcTranslateMatrix(),\n options = {\n angle: this.angle,\n translateX: tMatrix[4],\n translateY: tMatrix[5],\n scaleX: this.scaleX,\n scaleY: this.scaleY,\n skewX: this.skewX,\n skewY: this.skewY,\n flipX: this.flipX,\n flipY: this.flipY\n };\n\n cache.key = key;\n cache.value = util.composeMatrix(options);\n return cache.value;\n },\n\n /*\n * Calculate object dimensions from its properties\n * @private\n * @deprecated since 3.4.0, please use fabric.util._calcDimensionsTransformMatrix\n * not including or including flipX, flipY to emulate the flipping boolean\n * @return {Object} .x width dimension\n * @return {Object} .y height dimension\n */\n _calcDimensionsTransformMatrix: function (skewX, skewY, flipping) {\n return util.calcDimensionsMatrix({\n skewX: skewX,\n skewY: skewY,\n scaleX: this.scaleX * (flipping && this.flipX ? -1 : 1),\n scaleY: this.scaleY * (flipping && this.flipY ? -1 : 1)\n });\n },\n\n /*\n * Calculate object dimensions from its properties\n * @private\n * @return {Object} .x width dimension\n * @return {Object} .y height dimension\n */\n _getNonTransformedDimensions: function () {\n var strokeWidth = this.strokeWidth,\n w = this.width + strokeWidth,\n h = this.height + strokeWidth;\n return {\n x: w,\n y: h\n };\n },\n\n /*\n * Calculate object bounding box dimensions from its properties scale, skew.\n * @param {Number} skewX, a value to override current skewX\n * @param {Number} skewY, a value to override current skewY\n * @private\n * @return {Object} .x width dimension\n * @return {Object} .y height dimension\n */\n _getTransformedDimensions: function (skewX, skewY) {\n if (typeof skewX === 'undefined') {\n skewX = this.skewX;\n }\n\n if (typeof skewY === 'undefined') {\n skewY = this.skewY;\n }\n\n var dimensions = this._getNonTransformedDimensions(),\n dimX,\n dimY,\n noSkew = skewX === 0 && skewY === 0;\n\n if (this.strokeUniform) {\n dimX = this.width;\n dimY = this.height;\n } else {\n dimX = dimensions.x;\n dimY = dimensions.y;\n }\n\n if (noSkew) {\n return this._finalizeDimensions(dimX * this.scaleX, dimY * this.scaleY);\n }\n\n var bbox = util.sizeAfterTransform(dimX, dimY, {\n scaleX: this.scaleX,\n scaleY: this.scaleY,\n skewX: skewX,\n skewY: skewY\n });\n return this._finalizeDimensions(bbox.x, bbox.y);\n },\n\n /*\n * Calculate object bounding box dimensions from its properties scale, skew.\n * @param Number width width of the bbox\n * @param Number height height of the bbox\n * @private\n * @return {Object} .x finalized width dimension\n * @return {Object} .y finalized height dimension\n */\n _finalizeDimensions: function (width, height) {\n return this.strokeUniform ? {\n x: width + this.strokeWidth,\n y: height + this.strokeWidth\n } : {\n x: width,\n y: height\n };\n },\n\n /*\n * Calculate object dimensions for controls box, including padding and canvas zoom.\n * and active selection\n * private\n */\n _calculateCurrentDimensions: function () {\n var vpt = this.getViewportTransform(),\n dim = this._getTransformedDimensions(),\n p = transformPoint(dim, vpt, true);\n\n return p.scalarAdd(2 * this.padding);\n }\n });\n})();\n\nfabric.util.object.extend(fabric.Object.prototype,\n/** @lends fabric.Object.prototype */\n{\n /**\n * Moves an object to the bottom of the stack of drawn objects\n * @return {fabric.Object} thisArg\n * @chainable\n */\n sendToBack: function () {\n if (this.group) {\n fabric.StaticCanvas.prototype.sendToBack.call(this.group, this);\n } else if (this.canvas) {\n this.canvas.sendToBack(this);\n }\n\n return this;\n },\n\n /**\n * Moves an object to the top of the stack of drawn objects\n * @return {fabric.Object} thisArg\n * @chainable\n */\n bringToFront: function () {\n if (this.group) {\n fabric.StaticCanvas.prototype.bringToFront.call(this.group, this);\n } else if (this.canvas) {\n this.canvas.bringToFront(this);\n }\n\n return this;\n },\n\n /**\n * Moves an object down in stack of drawn objects\n * @param {Boolean} [intersecting] If `true`, send object behind next lower intersecting object\n * @return {fabric.Object} thisArg\n * @chainable\n */\n sendBackwards: function (intersecting) {\n if (this.group) {\n fabric.StaticCanvas.prototype.sendBackwards.call(this.group, this, intersecting);\n } else if (this.canvas) {\n this.canvas.sendBackwards(this, intersecting);\n }\n\n return this;\n },\n\n /**\n * Moves an object up in stack of drawn objects\n * @param {Boolean} [intersecting] If `true`, send object in front of next upper intersecting object\n * @return {fabric.Object} thisArg\n * @chainable\n */\n bringForward: function (intersecting) {\n if (this.group) {\n fabric.StaticCanvas.prototype.bringForward.call(this.group, this, intersecting);\n } else if (this.canvas) {\n this.canvas.bringForward(this, intersecting);\n }\n\n return this;\n },\n\n /**\n * Moves an object to specified level in stack of drawn objects\n * @param {Number} index New position of object\n * @return {fabric.Object} thisArg\n * @chainable\n */\n moveTo: function (index) {\n if (this.group && this.group.type !== 'activeSelection') {\n fabric.StaticCanvas.prototype.moveTo.call(this.group, this, index);\n } else if (this.canvas) {\n this.canvas.moveTo(this, index);\n }\n\n return this;\n }\n});\n/* _TO_SVG_START_ */\n\n(function () {\n function getSvgColorString(prop, value) {\n if (!value) {\n return prop + ': none; ';\n } else if (value.toLive) {\n return prop + ': url(#SVGID_' + value.id + '); ';\n } else {\n var color = new fabric.Color(value),\n str = prop + ': ' + color.toRgb() + '; ',\n opacity = color.getAlpha();\n\n if (opacity !== 1) {\n //change the color in rgb + opacity\n str += prop + '-opacity: ' + opacity.toString() + '; ';\n }\n\n return str;\n }\n }\n\n var toFixed = fabric.util.toFixed;\n fabric.util.object.extend(fabric.Object.prototype,\n /** @lends fabric.Object.prototype */\n {\n /**\n * Returns styles-string for svg-export\n * @param {Boolean} skipShadow a boolean to skip shadow filter output\n * @return {String}\n */\n getSvgStyles: function (skipShadow) {\n var fillRule = this.fillRule ? this.fillRule : 'nonzero',\n strokeWidth = this.strokeWidth ? this.strokeWidth : '0',\n strokeDashArray = this.strokeDashArray ? this.strokeDashArray.join(' ') : 'none',\n strokeDashOffset = this.strokeDashOffset ? this.strokeDashOffset : '0',\n strokeLineCap = this.strokeLineCap ? this.strokeLineCap : 'butt',\n strokeLineJoin = this.strokeLineJoin ? this.strokeLineJoin : 'miter',\n strokeMiterLimit = this.strokeMiterLimit ? this.strokeMiterLimit : '4',\n opacity = typeof this.opacity !== 'undefined' ? this.opacity : '1',\n visibility = this.visible ? '' : ' visibility: hidden;',\n filter = skipShadow ? '' : this.getSvgFilter(),\n fill = getSvgColorString('fill', this.fill),\n stroke = getSvgColorString('stroke', this.stroke);\n return [stroke, 'stroke-width: ', strokeWidth, '; ', 'stroke-dasharray: ', strokeDashArray, '; ', 'stroke-linecap: ', strokeLineCap, '; ', 'stroke-dashoffset: ', strokeDashOffset, '; ', 'stroke-linejoin: ', strokeLineJoin, '; ', 'stroke-miterlimit: ', strokeMiterLimit, '; ', fill, 'fill-rule: ', fillRule, '; ', 'opacity: ', opacity, ';', filter, visibility].join('');\n },\n\n /**\n * Returns styles-string for svg-export\n * @param {Object} style the object from which to retrieve style properties\n * @param {Boolean} useWhiteSpace a boolean to include an additional attribute in the style.\n * @return {String}\n */\n getSvgSpanStyles: function (style, useWhiteSpace) {\n var term = '; ';\n var fontFamily = style.fontFamily ? 'font-family: ' + (style.fontFamily.indexOf('\\'') === -1 && style.fontFamily.indexOf('\"') === -1 ? '\\'' + style.fontFamily + '\\'' : style.fontFamily) + term : '';\n var strokeWidth = style.strokeWidth ? 'stroke-width: ' + style.strokeWidth + term : '',\n fontFamily = fontFamily,\n fontSize = style.fontSize ? 'font-size: ' + style.fontSize + 'px' + term : '',\n fontStyle = style.fontStyle ? 'font-style: ' + style.fontStyle + term : '',\n fontWeight = style.fontWeight ? 'font-weight: ' + style.fontWeight + term : '',\n fill = style.fill ? getSvgColorString('fill', style.fill) : '',\n stroke = style.stroke ? getSvgColorString('stroke', style.stroke) : '',\n textDecoration = this.getSvgTextDecoration(style),\n deltaY = style.deltaY ? 'baseline-shift: ' + -style.deltaY + '; ' : '';\n\n if (textDecoration) {\n textDecoration = 'text-decoration: ' + textDecoration + term;\n }\n\n return [stroke, strokeWidth, fontFamily, fontSize, fontStyle, fontWeight, textDecoration, fill, deltaY, useWhiteSpace ? 'white-space: pre; ' : ''].join('');\n },\n\n /**\n * Returns text-decoration property for svg-export\n * @param {Object} style the object from which to retrieve style properties\n * @return {String}\n */\n getSvgTextDecoration: function (style) {\n return ['overline', 'underline', 'line-through'].filter(function (decoration) {\n return style[decoration.replace('-', '')];\n }).join(' ');\n },\n\n /**\n * Returns filter for svg shadow\n * @return {String}\n */\n getSvgFilter: function () {\n return this.shadow ? 'filter: url(#SVGID_' + this.shadow.id + ');' : '';\n },\n\n /**\n * Returns id attribute for svg output\n * @return {String}\n */\n getSvgCommons: function () {\n return [this.id ? 'id=\"' + this.id + '\" ' : '', this.clipPath ? 'clip-path=\"url(#' + this.clipPath.clipPathId + ')\" ' : ''].join('');\n },\n\n /**\n * Returns transform-string for svg-export\n * @param {Boolean} use the full transform or the single object one.\n * @return {String}\n */\n getSvgTransform: function (full, additionalTransform) {\n var transform = full ? this.calcTransformMatrix() : this.calcOwnMatrix(),\n svgTransform = 'transform=\"' + fabric.util.matrixToSVG(transform);\n return svgTransform + (additionalTransform || '') + '\" ';\n },\n _setSVGBg: function (textBgRects) {\n if (this.backgroundColor) {\n var NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS;\n textBgRects.push('\\t\\t<rect ', this._getFillAttributes(this.backgroundColor), ' x=\"', toFixed(-this.width / 2, NUM_FRACTION_DIGITS), '\" y=\"', toFixed(-this.height / 2, NUM_FRACTION_DIGITS), '\" width=\"', toFixed(this.width, NUM_FRACTION_DIGITS), '\" height=\"', toFixed(this.height, NUM_FRACTION_DIGITS), '\"></rect>\\n');\n }\n },\n\n /**\n * Returns svg representation of an instance\n * @param {Function} [reviver] Method for further parsing of svg representation.\n * @return {String} svg representation of an instance\n */\n toSVG: function (reviver) {\n return this._createBaseSVGMarkup(this._toSVG(reviver), {\n reviver: reviver\n });\n },\n\n /**\n * Returns svg clipPath representation of an instance\n * @param {Function} [reviver] Method for further parsing of svg representation.\n * @return {String} svg representation of an instance\n */\n toClipPathSVG: function (reviver) {\n return '\\t' + this._createBaseClipPathSVGMarkup(this._toSVG(reviver), {\n reviver: reviver\n });\n },\n\n /**\n * @private\n */\n _createBaseClipPathSVGMarkup: function (objectMarkup, options) {\n options = options || {};\n var reviver = options.reviver,\n additionalTransform = options.additionalTransform || '',\n commonPieces = [this.getSvgTransform(true, additionalTransform), this.getSvgCommons()].join(''),\n // insert commons in the markup, style and svgCommons\n index = objectMarkup.indexOf('COMMON_PARTS');\n objectMarkup[index] = commonPieces;\n return reviver ? reviver(objectMarkup.join('')) : objectMarkup.join('');\n },\n\n /**\n * @private\n */\n _createBaseSVGMarkup: function (objectMarkup, options) {\n options = options || {};\n var noStyle = options.noStyle,\n reviver = options.reviver,\n styleInfo = noStyle ? '' : 'style=\"' + this.getSvgStyles() + '\" ',\n shadowInfo = options.withShadow ? 'style=\"' + this.getSvgFilter() + '\" ' : '',\n clipPath = this.clipPath,\n vectorEffect = this.strokeUniform ? 'vector-effect=\"non-scaling-stroke\" ' : '',\n absoluteClipPath = clipPath && clipPath.absolutePositioned,\n stroke = this.stroke,\n fill = this.fill,\n shadow = this.shadow,\n commonPieces,\n markup = [],\n clipPathMarkup,\n // insert commons in the markup, style and svgCommons\n index = objectMarkup.indexOf('COMMON_PARTS'),\n additionalTransform = options.additionalTransform;\n\n if (clipPath) {\n clipPath.clipPathId = 'CLIPPATH_' + fabric.Object.__uid++;\n clipPathMarkup = '<clipPath id=\"' + clipPath.clipPathId + '\" >\\n' + clipPath.toClipPathSVG(reviver) + '</clipPath>\\n';\n }\n\n if (absoluteClipPath) {\n markup.push('<g ', shadowInfo, this.getSvgCommons(), ' >\\n');\n }\n\n markup.push('<g ', this.getSvgTransform(false), !absoluteClipPath ? shadowInfo + this.getSvgCommons() : '', ' >\\n');\n commonPieces = [styleInfo, vectorEffect, noStyle ? '' : this.addPaintOrder(), ' ', additionalTransform ? 'transform=\"' + additionalTransform + '\" ' : ''].join('');\n objectMarkup[index] = commonPieces;\n\n if (fill && fill.toLive) {\n markup.push(fill.toSVG(this));\n }\n\n if (stroke && stroke.toLive) {\n markup.push(stroke.toSVG(this));\n }\n\n if (shadow) {\n markup.push(shadow.toSVG(this));\n }\n\n if (clipPath) {\n markup.push(clipPathMarkup);\n }\n\n markup.push(objectMarkup.join(''));\n markup.push('</g>\\n');\n absoluteClipPath && markup.push('</g>\\n');\n return reviver ? reviver(markup.join('')) : markup.join('');\n },\n addPaintOrder: function () {\n return this.paintFirst !== 'fill' ? ' paint-order=\"' + this.paintFirst + '\" ' : '';\n }\n });\n})();\n/* _TO_SVG_END_ */\n\n\n(function () {\n var extend = fabric.util.object.extend,\n originalSet = 'stateProperties';\n /*\n Depends on `stateProperties`\n */\n\n function saveProps(origin, destination, props) {\n var tmpObj = {},\n deep = true;\n props.forEach(function (prop) {\n tmpObj[prop] = origin[prop];\n });\n extend(origin[destination], tmpObj, deep);\n }\n\n function _isEqual(origValue, currentValue, firstPass) {\n if (origValue === currentValue) {\n // if the objects are identical, return\n return true;\n } else if (Array.isArray(origValue)) {\n if (!Array.isArray(currentValue) || origValue.length !== currentValue.length) {\n return false;\n }\n\n for (var i = 0, len = origValue.length; i < len; i++) {\n if (!_isEqual(origValue[i], currentValue[i])) {\n return false;\n }\n }\n\n return true;\n } else if (origValue && typeof origValue === 'object') {\n var keys = Object.keys(origValue),\n key;\n\n if (!currentValue || typeof currentValue !== 'object' || !firstPass && keys.length !== Object.keys(currentValue).length) {\n return false;\n }\n\n for (var i = 0, len = keys.length; i < len; i++) {\n key = keys[i]; // since clipPath is in the statefull cache list and the clipPath objects\n // would be iterated as an object, this would lead to possible infinite recursion\n // we do not want to compare those.\n\n if (key === 'canvas' || key === 'group') {\n continue;\n }\n\n if (!_isEqual(origValue[key], currentValue[key])) {\n return false;\n }\n }\n\n return true;\n }\n }\n\n fabric.util.object.extend(fabric.Object.prototype,\n /** @lends fabric.Object.prototype */\n {\n /**\n * Returns true if object state (one of its state properties) was changed\n * @param {String} [propertySet] optional name for the set of property we want to save\n * @return {Boolean} true if instance' state has changed since `{@link fabric.Object#saveState}` was called\n */\n hasStateChanged: function (propertySet) {\n propertySet = propertySet || originalSet;\n var dashedPropertySet = '_' + propertySet;\n\n if (Object.keys(this[dashedPropertySet]).length < this[propertySet].length) {\n return true;\n }\n\n return !_isEqual(this[dashedPropertySet], this, true);\n },\n\n /**\n * Saves state of an object\n * @param {Object} [options] Object with additional `stateProperties` array to include when saving state\n * @return {fabric.Object} thisArg\n */\n saveState: function (options) {\n var propertySet = options && options.propertySet || originalSet,\n destination = '_' + propertySet;\n\n if (!this[destination]) {\n return this.setupState(options);\n }\n\n saveProps(this, destination, this[propertySet]);\n\n if (options && options.stateProperties) {\n saveProps(this, destination, options.stateProperties);\n }\n\n return this;\n },\n\n /**\n * Setups state of an object\n * @param {Object} [options] Object with additional `stateProperties` array to include when saving state\n * @return {fabric.Object} thisArg\n */\n setupState: function (options) {\n options = options || {};\n var propertySet = options.propertySet || originalSet;\n options.propertySet = propertySet;\n this['_' + propertySet] = {};\n this.saveState(options);\n return this;\n }\n });\n})();\n\n(function () {\n var degreesToRadians = fabric.util.degreesToRadians;\n fabric.util.object.extend(fabric.Object.prototype,\n /** @lends fabric.Object.prototype */\n {\n /**\n * Determines which corner has been clicked\n * @private\n * @param {Object} pointer The pointer indicating the mouse position\n * @return {String|Boolean} corner code (tl, tr, bl, br, etc.), or false if nothing is found\n */\n _findTargetCorner: function (pointer, forTouch) {\n // objects in group, anykind, are not self modificable,\n // must not return an hovered corner.\n if (!this.hasControls || this.group || !this.canvas || this.canvas._activeObject !== this) {\n return false;\n }\n\n var ex = pointer.x,\n ey = pointer.y,\n xPoints,\n lines,\n keys = Object.keys(this.oCoords),\n j = keys.length - 1,\n i;\n this.__corner = 0; // cycle in reverse order so we pick first the one on top\n\n for (; j >= 0; j--) {\n i = keys[j];\n\n if (!this.isControlVisible(i)) {\n continue;\n }\n\n lines = this._getImageLines(forTouch ? this.oCoords[i].touchCorner : this.oCoords[i].corner); // debugging\n // this.canvas.contextTop.fillRect(lines.bottomline.d.x, lines.bottomline.d.y, 2, 2);\n // this.canvas.contextTop.fillRect(lines.bottomline.o.x, lines.bottomline.o.y, 2, 2);\n //\n // this.canvas.contextTop.fillRect(lines.leftline.d.x, lines.leftline.d.y, 2, 2);\n // this.canvas.contextTop.fillRect(lines.leftline.o.x, lines.leftline.o.y, 2, 2);\n //\n // this.canvas.contextTop.fillRect(lines.topline.d.x, lines.topline.d.y, 2, 2);\n // this.canvas.contextTop.fillRect(lines.topline.o.x, lines.topline.o.y, 2, 2);\n //\n // this.canvas.contextTop.fillRect(lines.rightline.d.x, lines.rightline.d.y, 2, 2);\n // this.canvas.contextTop.fillRect(lines.rightline.o.x, lines.rightline.o.y, 2, 2);\n\n xPoints = this._findCrossPoints({\n x: ex,\n y: ey\n }, lines);\n\n if (xPoints !== 0 && xPoints % 2 === 1) {\n this.__corner = i;\n return i;\n }\n }\n\n return false;\n },\n\n /**\n * Calls a function for each control. The function gets called,\n * with the control, the object that is calling the iterator and the control's key\n * @param {Function} fn function to iterate over the controls over\n */\n forEachControl: function (fn) {\n for (var i in this.controls) {\n fn(this.controls[i], i, this);\n }\n\n ;\n },\n\n /**\n * Sets the coordinates of the draggable boxes in the corners of\n * the image used to scale/rotate it.\n * note: if we would switch to ROUND corner area, all of this would disappear.\n * everything would resolve to a single point and a pythagorean theorem for the distance\n * @private\n */\n _setCornerCoords: function () {\n var coords = this.oCoords,\n newTheta = degreesToRadians(45 - this.angle),\n cosTheta = fabric.util.cos(newTheta),\n sinTheta = fabric.util.sin(newTheta),\n\n /* Math.sqrt(2 * Math.pow(this.cornerSize, 2)) / 2, */\n\n /* 0.707106 stands for sqrt(2)/2 */\n cornerHypotenuse = this.cornerSize * 0.707106,\n touchHypotenuse = this.touchCornerSize * 0.707106,\n cosHalfOffset = cornerHypotenuse * cosTheta,\n sinHalfOffset = cornerHypotenuse * sinTheta,\n touchCosHalfOffset = touchHypotenuse * cosTheta,\n touchSinHalfOffset = touchHypotenuse * sinTheta,\n x,\n y;\n\n for (var control in coords) {\n x = coords[control].x;\n y = coords[control].y;\n coords[control].corner = {\n tl: {\n x: x - sinHalfOffset,\n y: y - cosHalfOffset\n },\n tr: {\n x: x + cosHalfOffset,\n y: y - sinHalfOffset\n },\n bl: {\n x: x - cosHalfOffset,\n y: y + sinHalfOffset\n },\n br: {\n x: x + sinHalfOffset,\n y: y + cosHalfOffset\n }\n };\n coords[control].touchCorner = {\n tl: {\n x: x - touchSinHalfOffset,\n y: y - touchCosHalfOffset\n },\n tr: {\n x: x + touchCosHalfOffset,\n y: y - touchSinHalfOffset\n },\n bl: {\n x: x - touchCosHalfOffset,\n y: y + touchSinHalfOffset\n },\n br: {\n x: x + touchSinHalfOffset,\n y: y + touchCosHalfOffset\n }\n };\n }\n },\n\n /**\n * Draws a colored layer behind the object, inside its selection borders.\n * Requires public options: padding, selectionBackgroundColor\n * this function is called when the context is transformed\n * has checks to be skipped when the object is on a staticCanvas\n * @param {CanvasRenderingContext2D} ctx Context to draw on\n * @return {fabric.Object} thisArg\n * @chainable\n */\n drawSelectionBackground: function (ctx) {\n if (!this.selectionBackgroundColor || this.canvas && !this.canvas.interactive || this.canvas && this.canvas._activeObject !== this) {\n return this;\n }\n\n ctx.save();\n\n var center = this.getCenterPoint(),\n wh = this._calculateCurrentDimensions(),\n vpt = this.canvas.viewportTransform;\n\n ctx.translate(center.x, center.y);\n ctx.scale(1 / vpt[0], 1 / vpt[3]);\n ctx.rotate(degreesToRadians(this.angle));\n ctx.fillStyle = this.selectionBackgroundColor;\n ctx.fillRect(-wh.x / 2, -wh.y / 2, wh.x, wh.y);\n ctx.restore();\n return this;\n },\n\n /**\n * Draws borders of an object's bounding box.\n * Requires public properties: width, height\n * Requires public options: padding, borderColor\n * @param {CanvasRenderingContext2D} ctx Context to draw on\n * @param {Object} styleOverride object to override the object style\n * @return {fabric.Object} thisArg\n * @chainable\n */\n drawBorders: function (ctx, styleOverride) {\n styleOverride = styleOverride || {};\n\n var wh = this._calculateCurrentDimensions(),\n strokeWidth = this.borderScaleFactor,\n width = wh.x + strokeWidth,\n height = wh.y + strokeWidth,\n hasControls = typeof styleOverride.hasControls !== 'undefined' ? styleOverride.hasControls : this.hasControls,\n shouldStroke = false;\n\n ctx.save();\n ctx.strokeStyle = styleOverride.borderColor || this.borderColor;\n\n this._setLineDash(ctx, styleOverride.borderDashArray || this.borderDashArray, null);\n\n ctx.strokeRect(-width / 2, -height / 2, width, height);\n\n if (hasControls) {\n ctx.beginPath();\n this.forEachControl(function (control, key, fabricObject) {\n // in this moment, the ctx is centered on the object.\n // width and height of the above function are the size of the bbox.\n if (control.withConnection && control.getVisibility(fabricObject, key)) {\n // reset movement for each control\n shouldStroke = true;\n ctx.moveTo(control.x * width, control.y * height);\n ctx.lineTo(control.x * width + control.offsetX, control.y * height + control.offsetY);\n }\n });\n\n if (shouldStroke) {\n ctx.stroke();\n }\n }\n\n ctx.restore();\n return this;\n },\n\n /**\n * Draws borders of an object's bounding box when it is inside a group.\n * Requires public properties: width, height\n * Requires public options: padding, borderColor\n * @param {CanvasRenderingContext2D} ctx Context to draw on\n * @param {object} options object representing current object parameters\n * @param {Object} styleOverride object to override the object style\n * @return {fabric.Object} thisArg\n * @chainable\n */\n drawBordersInGroup: function (ctx, options, styleOverride) {\n styleOverride = styleOverride || {};\n var bbox = fabric.util.sizeAfterTransform(this.width, this.height, options),\n strokeWidth = this.strokeWidth,\n strokeUniform = this.strokeUniform,\n borderScaleFactor = this.borderScaleFactor,\n width = bbox.x + strokeWidth * (strokeUniform ? this.canvas.getZoom() : options.scaleX) + borderScaleFactor,\n height = bbox.y + strokeWidth * (strokeUniform ? this.canvas.getZoom() : options.scaleY) + borderScaleFactor;\n ctx.save();\n\n this._setLineDash(ctx, styleOverride.borderDashArray || this.borderDashArray, null);\n\n ctx.strokeStyle = styleOverride.borderColor || this.borderColor;\n ctx.strokeRect(-width / 2, -height / 2, width, height);\n ctx.restore();\n return this;\n },\n\n /**\n * Draws corners of an object's bounding box.\n * Requires public properties: width, height\n * Requires public options: cornerSize, padding\n * @param {CanvasRenderingContext2D} ctx Context to draw on\n * @param {Object} styleOverride object to override the object style\n * @return {fabric.Object} thisArg\n * @chainable\n */\n drawControls: function (ctx, styleOverride) {\n styleOverride = styleOverride || {};\n ctx.save();\n ctx.setTransform(this.canvas.getRetinaScaling(), 0, 0, this.canvas.getRetinaScaling(), 0, 0);\n ctx.strokeStyle = ctx.fillStyle = styleOverride.cornerColor || this.cornerColor;\n\n if (!this.transparentCorners) {\n ctx.strokeStyle = styleOverride.cornerStrokeColor || this.cornerStrokeColor;\n }\n\n this._setLineDash(ctx, styleOverride.cornerDashArray || this.cornerDashArray, null);\n\n this.setCoords();\n this.forEachControl(function (control, key, fabricObject) {\n if (control.getVisibility(fabricObject, key)) {\n control.render(ctx, fabricObject.oCoords[key].x, fabricObject.oCoords[key].y, styleOverride, fabricObject);\n }\n });\n ctx.restore();\n return this;\n },\n\n /**\n * Returns true if the specified control is visible, false otherwise.\n * @param {String} controlKey The key of the control. Possible values are 'tl', 'tr', 'br', 'bl', 'ml', 'mt', 'mr', 'mb', 'mtr'.\n * @returns {Boolean} true if the specified control is visible, false otherwise\n */\n isControlVisible: function (controlKey) {\n return this.controls[controlKey] && this.controls[controlKey].getVisibility(this, controlKey);\n },\n\n /**\n * Sets the visibility of the specified control.\n * @param {String} controlKey The key of the control. Possible values are 'tl', 'tr', 'br', 'bl', 'ml', 'mt', 'mr', 'mb', 'mtr'.\n * @param {Boolean} visible true to set the specified control visible, false otherwise\n * @return {fabric.Object} thisArg\n * @chainable\n */\n setControlVisible: function (controlKey, visible) {\n if (!this._controlsVisibility) {\n this._controlsVisibility = {};\n }\n\n this._controlsVisibility[controlKey] = visible;\n return this;\n },\n\n /**\n * Sets the visibility state of object controls.\n * @param {Object} [options] Options object\n * @param {Boolean} [options.bl] true to enable the bottom-left control, false to disable it\n * @param {Boolean} [options.br] true to enable the bottom-right control, false to disable it\n * @param {Boolean} [options.mb] true to enable the middle-bottom control, false to disable it\n * @param {Boolean} [options.ml] true to enable the middle-left control, false to disable it\n * @param {Boolean} [options.mr] true to enable the middle-right control, false to disable it\n * @param {Boolean} [options.mt] true to enable the middle-top control, false to disable it\n * @param {Boolean} [options.tl] true to enable the top-left control, false to disable it\n * @param {Boolean} [options.tr] true to enable the top-right control, false to disable it\n * @param {Boolean} [options.mtr] true to enable the middle-top-rotate control, false to disable it\n * @return {fabric.Object} thisArg\n * @chainable\n */\n setControlsVisibility: function (options) {\n options || (options = {});\n\n for (var p in options) {\n this.setControlVisible(p, options[p]);\n }\n\n return this;\n },\n\n /**\n * This callback function is called every time _discardActiveObject or _setActiveObject\n * try to to deselect this object. If the function returns true, the process is cancelled\n * @param {Object} [options] options sent from the upper functions\n * @param {Event} [options.e] event if the process is generated by an event\n */\n onDeselect: function () {// implemented by sub-classes, as needed.\n },\n\n /**\n * This callback function is called every time _discardActiveObject or _setActiveObject\n * try to to select this object. If the function returns true, the process is cancelled\n * @param {Object} [options] options sent from the upper functions\n * @param {Event} [options.e] event if the process is generated by an event\n */\n onSelect: function () {// implemented by sub-classes, as needed.\n }\n });\n})();\n\nfabric.util.object.extend(fabric.StaticCanvas.prototype,\n/** @lends fabric.StaticCanvas.prototype */\n{\n /**\n * Animation duration (in ms) for fx* methods\n * @type Number\n * @default\n */\n FX_DURATION: 500,\n\n /**\n * Centers object horizontally with animation.\n * @param {fabric.Object} object Object to center\n * @param {Object} [callbacks] Callbacks object with optional \"onComplete\" and/or \"onChange\" properties\n * @param {Function} [callbacks.onComplete] Invoked on completion\n * @param {Function} [callbacks.onChange] Invoked on every step of animation\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n fxCenterObjectH: function (object, callbacks) {\n callbacks = callbacks || {};\n\n var empty = function () {},\n onComplete = callbacks.onComplete || empty,\n onChange = callbacks.onChange || empty,\n _this = this;\n\n fabric.util.animate({\n startValue: object.left,\n endValue: this.getCenter().left,\n duration: this.FX_DURATION,\n onChange: function (value) {\n object.set('left', value);\n\n _this.requestRenderAll();\n\n onChange();\n },\n onComplete: function () {\n object.setCoords();\n onComplete();\n }\n });\n return this;\n },\n\n /**\n * Centers object vertically with animation.\n * @param {fabric.Object} object Object to center\n * @param {Object} [callbacks] Callbacks object with optional \"onComplete\" and/or \"onChange\" properties\n * @param {Function} [callbacks.onComplete] Invoked on completion\n * @param {Function} [callbacks.onChange] Invoked on every step of animation\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n fxCenterObjectV: function (object, callbacks) {\n callbacks = callbacks || {};\n\n var empty = function () {},\n onComplete = callbacks.onComplete || empty,\n onChange = callbacks.onChange || empty,\n _this = this;\n\n fabric.util.animate({\n startValue: object.top,\n endValue: this.getCenter().top,\n duration: this.FX_DURATION,\n onChange: function (value) {\n object.set('top', value);\n\n _this.requestRenderAll();\n\n onChange();\n },\n onComplete: function () {\n object.setCoords();\n onComplete();\n }\n });\n return this;\n },\n\n /**\n * Same as `fabric.Canvas#remove` but animated\n * @param {fabric.Object} object Object to remove\n * @param {Object} [callbacks] Callbacks object with optional \"onComplete\" and/or \"onChange\" properties\n * @param {Function} [callbacks.onComplete] Invoked on completion\n * @param {Function} [callbacks.onChange] Invoked on every step of animation\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n fxRemove: function (object, callbacks) {\n callbacks = callbacks || {};\n\n var empty = function () {},\n onComplete = callbacks.onComplete || empty,\n onChange = callbacks.onChange || empty,\n _this = this;\n\n fabric.util.animate({\n startValue: object.opacity,\n endValue: 0,\n duration: this.FX_DURATION,\n onChange: function (value) {\n object.set('opacity', value);\n\n _this.requestRenderAll();\n\n onChange();\n },\n onComplete: function () {\n _this.remove(object);\n\n onComplete();\n }\n });\n return this;\n }\n});\nfabric.util.object.extend(fabric.Object.prototype,\n/** @lends fabric.Object.prototype */\n{\n /**\n * Animates object's properties\n * @param {String|Object} property Property to animate (if string) or properties to animate (if object)\n * @param {Number|Object} value Value to animate property to (if string was given first) or options object\n * @return {fabric.Object} thisArg\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-2#animation}\n * @chainable\n *\n * As object — multiple properties\n *\n * object.animate({ left: ..., top: ... });\n * object.animate({ left: ..., top: ... }, { duration: ... });\n *\n * As string — one property\n *\n * object.animate('left', ...);\n * object.animate('left', { duration: ... });\n *\n */\n animate: function () {\n if (arguments[0] && typeof arguments[0] === 'object') {\n var propsToAnimate = [],\n prop,\n skipCallbacks;\n\n for (prop in arguments[0]) {\n propsToAnimate.push(prop);\n }\n\n for (var i = 0, len = propsToAnimate.length; i < len; i++) {\n prop = propsToAnimate[i];\n skipCallbacks = i !== len - 1;\n\n this._animate(prop, arguments[0][prop], arguments[1], skipCallbacks);\n }\n } else {\n this._animate.apply(this, arguments);\n }\n\n return this;\n },\n\n /**\n * @private\n * @param {String} property Property to animate\n * @param {String} to Value to animate to\n * @param {Object} [options] Options object\n * @param {Boolean} [skipCallbacks] When true, callbacks like onchange and oncomplete are not invoked\n */\n _animate: function (property, to, options, skipCallbacks) {\n var _this = this,\n propPair;\n\n to = to.toString();\n\n if (!options) {\n options = {};\n } else {\n options = fabric.util.object.clone(options);\n }\n\n if (~property.indexOf('.')) {\n propPair = property.split('.');\n }\n\n var propIsColor = _this.colorProperties.indexOf(property) > -1 || propPair && _this.colorProperties.indexOf(propPair[1]) > -1;\n var currentValue = propPair ? this.get(propPair[0])[propPair[1]] : this.get(property);\n\n if (!('from' in options)) {\n options.from = currentValue;\n }\n\n if (!propIsColor) {\n if (~to.indexOf('=')) {\n to = currentValue + parseFloat(to.replace('=', ''));\n } else {\n to = parseFloat(to);\n }\n }\n\n var _options = {\n startValue: options.from,\n endValue: to,\n byValue: options.by,\n easing: options.easing,\n duration: options.duration,\n abort: options.abort && function () {\n return options.abort.call(_this);\n },\n onChange: function (value, valueProgress, timeProgress) {\n if (propPair) {\n _this[propPair[0]][propPair[1]] = value;\n } else {\n _this.set(property, value);\n }\n\n if (skipCallbacks) {\n return;\n }\n\n options.onChange && options.onChange(value, valueProgress, timeProgress);\n },\n onComplete: function (value, valueProgress, timeProgress) {\n if (skipCallbacks) {\n return;\n }\n\n _this.setCoords();\n\n options.onComplete && options.onComplete(value, valueProgress, timeProgress);\n }\n };\n\n if (propIsColor) {\n fabric.util.animateColor(_options.startValue, _options.endValue, _options.duration, _options);\n } else {\n fabric.util.animate(_options);\n }\n }\n});\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n extend = fabric.util.object.extend,\n clone = fabric.util.object.clone,\n coordProps = {\n x1: 1,\n x2: 1,\n y1: 1,\n y2: 1\n },\n supportsLineDash = fabric.StaticCanvas.supports('setLineDash');\n\n if (fabric.Line) {\n fabric.warn('fabric.Line is already defined');\n return;\n }\n /**\n * Line class\n * @class fabric.Line\n * @extends fabric.Object\n * @see {@link fabric.Line#initialize} for constructor definition\n */\n\n\n fabric.Line = fabric.util.createClass(fabric.Object,\n /** @lends fabric.Line.prototype */\n {\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'line',\n\n /**\n * x value or first line edge\n * @type Number\n * @default\n */\n x1: 0,\n\n /**\n * y value or first line edge\n * @type Number\n * @default\n */\n y1: 0,\n\n /**\n * x value or second line edge\n * @type Number\n * @default\n */\n x2: 0,\n\n /**\n * y value or second line edge\n * @type Number\n * @default\n */\n y2: 0,\n cacheProperties: fabric.Object.prototype.cacheProperties.concat('x1', 'x2', 'y1', 'y2'),\n\n /**\n * Constructor\n * @param {Array} [points] Array of points\n * @param {Object} [options] Options object\n * @return {fabric.Line} thisArg\n */\n initialize: function (points, options) {\n if (!points) {\n points = [0, 0, 0, 0];\n }\n\n this.callSuper('initialize', options);\n this.set('x1', points[0]);\n this.set('y1', points[1]);\n this.set('x2', points[2]);\n this.set('y2', points[3]);\n\n this._setWidthHeight(options);\n },\n\n /**\n * @private\n * @param {Object} [options] Options\n */\n _setWidthHeight: function (options) {\n options || (options = {});\n this.width = Math.abs(this.x2 - this.x1);\n this.height = Math.abs(this.y2 - this.y1);\n this.left = 'left' in options ? options.left : this._getLeftToOriginX();\n this.top = 'top' in options ? options.top : this._getTopToOriginY();\n },\n\n /**\n * @private\n * @param {String} key\n * @param {*} value\n */\n _set: function (key, value) {\n this.callSuper('_set', key, value);\n\n if (typeof coordProps[key] !== 'undefined') {\n this._setWidthHeight();\n }\n\n return this;\n },\n\n /**\n * @private\n * @return {Number} leftToOriginX Distance from left edge of canvas to originX of Line.\n */\n _getLeftToOriginX: makeEdgeToOriginGetter({\n // property names\n origin: 'originX',\n axis1: 'x1',\n axis2: 'x2',\n dimension: 'width'\n }, {\n // possible values of origin\n nearest: 'left',\n center: 'center',\n farthest: 'right'\n }),\n\n /**\n * @private\n * @return {Number} topToOriginY Distance from top edge of canvas to originY of Line.\n */\n _getTopToOriginY: makeEdgeToOriginGetter({\n // property names\n origin: 'originY',\n axis1: 'y1',\n axis2: 'y2',\n dimension: 'height'\n }, {\n // possible values of origin\n nearest: 'top',\n center: 'center',\n farthest: 'bottom'\n }),\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _render: function (ctx) {\n ctx.beginPath();\n\n if (!this.strokeDashArray || this.strokeDashArray && supportsLineDash) {\n // move from center (of virtual box) to its left/top corner\n // we can't assume x1, y1 is top left and x2, y2 is bottom right\n var p = this.calcLinePoints();\n ctx.moveTo(p.x1, p.y1);\n ctx.lineTo(p.x2, p.y2);\n }\n\n ctx.lineWidth = this.strokeWidth; // TODO: test this\n // make sure setting \"fill\" changes color of a line\n // (by copying fillStyle to strokeStyle, since line is stroked, not filled)\n\n var origStrokeStyle = ctx.strokeStyle;\n ctx.strokeStyle = this.stroke || ctx.fillStyle;\n this.stroke && this._renderStroke(ctx);\n ctx.strokeStyle = origStrokeStyle;\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderDashedStroke: function (ctx) {\n var p = this.calcLinePoints();\n ctx.beginPath();\n fabric.util.drawDashedLine(ctx, p.x1, p.y1, p.x2, p.y2, this.strokeDashArray);\n ctx.closePath();\n },\n\n /**\n * This function is an helper for svg import. it returns the center of the object in the svg\n * untransformed coordinates\n * @private\n * @return {Object} center point from element coordinates\n */\n _findCenterFromElement: function () {\n return {\n x: (this.x1 + this.x2) / 2,\n y: (this.y1 + this.y2) / 2\n };\n },\n\n /**\n * Returns object representation of an instance\n * @methd toObject\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} object representation of an instance\n */\n toObject: function (propertiesToInclude) {\n return extend(this.callSuper('toObject', propertiesToInclude), this.calcLinePoints());\n },\n\n /*\n * Calculate object dimensions from its properties\n * @private\n */\n _getNonTransformedDimensions: function () {\n var dim = this.callSuper('_getNonTransformedDimensions');\n\n if (this.strokeLineCap === 'butt') {\n if (this.width === 0) {\n dim.y -= this.strokeWidth;\n }\n\n if (this.height === 0) {\n dim.x -= this.strokeWidth;\n }\n }\n\n return dim;\n },\n\n /**\n * Recalculates line points given width and height\n * @private\n */\n calcLinePoints: function () {\n var xMult = this.x1 <= this.x2 ? -1 : 1,\n yMult = this.y1 <= this.y2 ? -1 : 1,\n x1 = xMult * this.width * 0.5,\n y1 = yMult * this.height * 0.5,\n x2 = xMult * this.width * -0.5,\n y2 = yMult * this.height * -0.5;\n return {\n x1: x1,\n x2: x2,\n y1: y1,\n y2: y2\n };\n },\n\n /* _TO_SVG_START_ */\n\n /**\n * Returns svg representation of an instance\n * @return {Array} an array of strings with the specific svg representation\n * of the instance\n */\n _toSVG: function () {\n var p = this.calcLinePoints();\n return ['<line ', 'COMMON_PARTS', 'x1=\"', p.x1, '\" y1=\"', p.y1, '\" x2=\"', p.x2, '\" y2=\"', p.y2, '\" />\\n'];\n }\n /* _TO_SVG_END_ */\n\n });\n /* _FROM_SVG_START_ */\n\n /**\n * List of attribute names to account for when parsing SVG element (used by {@link fabric.Line.fromElement})\n * @static\n * @memberOf fabric.Line\n * @see http://www.w3.org/TR/SVG/shapes.html#LineElement\n */\n\n fabric.Line.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat('x1 y1 x2 y2'.split(' '));\n /**\n * Returns fabric.Line instance from an SVG element\n * @static\n * @memberOf fabric.Line\n * @param {SVGElement} element Element to parse\n * @param {Object} [options] Options object\n * @param {Function} [callback] callback function invoked after parsing\n */\n\n fabric.Line.fromElement = function (element, callback, options) {\n options = options || {};\n var parsedAttributes = fabric.parseAttributes(element, fabric.Line.ATTRIBUTE_NAMES),\n points = [parsedAttributes.x1 || 0, parsedAttributes.y1 || 0, parsedAttributes.x2 || 0, parsedAttributes.y2 || 0];\n callback(new fabric.Line(points, extend(parsedAttributes, options)));\n };\n /* _FROM_SVG_END_ */\n\n /**\n * Returns fabric.Line instance from an object representation\n * @static\n * @memberOf fabric.Line\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] invoked with new instance as first argument\n */\n\n\n fabric.Line.fromObject = function (object, callback) {\n function _callback(instance) {\n delete instance.points;\n callback && callback(instance);\n }\n\n ;\n var options = clone(object, true);\n options.points = [object.x1, object.y1, object.x2, object.y2];\n\n fabric.Object._fromObject('Line', options, _callback, 'points');\n };\n /**\n * Produces a function that calculates distance from canvas edge to Line origin.\n */\n\n\n function makeEdgeToOriginGetter(propertyNames, originValues) {\n var origin = propertyNames.origin,\n axis1 = propertyNames.axis1,\n axis2 = propertyNames.axis2,\n dimension = propertyNames.dimension,\n nearest = originValues.nearest,\n center = originValues.center,\n farthest = originValues.farthest;\n return function () {\n switch (this.get(origin)) {\n case nearest:\n return Math.min(this.get(axis1), this.get(axis2));\n\n case center:\n return Math.min(this.get(axis1), this.get(axis2)) + 0.5 * this.get(dimension);\n\n case farthest:\n return Math.max(this.get(axis1), this.get(axis2));\n }\n };\n }\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n pi = Math.PI;\n\n if (fabric.Circle) {\n fabric.warn('fabric.Circle is already defined.');\n return;\n }\n /**\n * Circle class\n * @class fabric.Circle\n * @extends fabric.Object\n * @see {@link fabric.Circle#initialize} for constructor definition\n */\n\n\n fabric.Circle = fabric.util.createClass(fabric.Object,\n /** @lends fabric.Circle.prototype */\n {\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'circle',\n\n /**\n * Radius of this circle\n * @type Number\n * @default\n */\n radius: 0,\n\n /**\n * Start angle of the circle, moving clockwise\n * deprectated type, this should be in degree, this was an oversight.\n * probably will change to degrees in next major version\n * @type Number\n * @default 0\n */\n startAngle: 0,\n\n /**\n * End angle of the circle\n * deprectated type, this should be in degree, this was an oversight.\n * probably will change to degrees in next major version\n * @type Number\n * @default 2Pi\n */\n endAngle: pi * 2,\n cacheProperties: fabric.Object.prototype.cacheProperties.concat('radius', 'startAngle', 'endAngle'),\n\n /**\n * @private\n * @param {String} key\n * @param {*} value\n * @return {fabric.Circle} thisArg\n */\n _set: function (key, value) {\n this.callSuper('_set', key, value);\n\n if (key === 'radius') {\n this.setRadius(value);\n }\n\n return this;\n },\n\n /**\n * Returns object representation of an instance\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} object representation of an instance\n */\n toObject: function (propertiesToInclude) {\n return this.callSuper('toObject', ['radius', 'startAngle', 'endAngle'].concat(propertiesToInclude));\n },\n\n /* _TO_SVG_START_ */\n\n /**\n * Returns svg representation of an instance\n * @return {Array} an array of strings with the specific svg representation\n * of the instance\n */\n _toSVG: function () {\n var svgString,\n x = 0,\n y = 0,\n angle = (this.endAngle - this.startAngle) % (2 * pi);\n\n if (angle === 0) {\n svgString = ['<circle ', 'COMMON_PARTS', 'cx=\"' + x + '\" cy=\"' + y + '\" ', 'r=\"', this.radius, '\" />\\n'];\n } else {\n var startX = fabric.util.cos(this.startAngle) * this.radius,\n startY = fabric.util.sin(this.startAngle) * this.radius,\n endX = fabric.util.cos(this.endAngle) * this.radius,\n endY = fabric.util.sin(this.endAngle) * this.radius,\n largeFlag = angle > pi ? '1' : '0';\n svgString = ['<path d=\"M ' + startX + ' ' + startY, ' A ' + this.radius + ' ' + this.radius, ' 0 ', +largeFlag + ' 1', ' ' + endX + ' ' + endY, '\" ', 'COMMON_PARTS', ' />\\n'];\n }\n\n return svgString;\n },\n\n /* _TO_SVG_END_ */\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx context to render on\n */\n _render: function (ctx) {\n ctx.beginPath();\n ctx.arc(0, 0, this.radius, this.startAngle, this.endAngle, false);\n\n this._renderPaintInOrder(ctx);\n },\n\n /**\n * Returns horizontal radius of an object (according to how an object is scaled)\n * @return {Number}\n */\n getRadiusX: function () {\n return this.get('radius') * this.get('scaleX');\n },\n\n /**\n * Returns vertical radius of an object (according to how an object is scaled)\n * @return {Number}\n */\n getRadiusY: function () {\n return this.get('radius') * this.get('scaleY');\n },\n\n /**\n * Sets radius of an object (and updates width accordingly)\n * @return {fabric.Circle} thisArg\n */\n setRadius: function (value) {\n this.radius = value;\n return this.set('width', value * 2).set('height', value * 2);\n }\n });\n /* _FROM_SVG_START_ */\n\n /**\n * List of attribute names to account for when parsing SVG element (used by {@link fabric.Circle.fromElement})\n * @static\n * @memberOf fabric.Circle\n * @see: http://www.w3.org/TR/SVG/shapes.html#CircleElement\n */\n\n fabric.Circle.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat('cx cy r'.split(' '));\n /**\n * Returns {@link fabric.Circle} instance from an SVG element\n * @static\n * @memberOf fabric.Circle\n * @param {SVGElement} element Element to parse\n * @param {Function} [callback] Options callback invoked after parsing is finished\n * @param {Object} [options] Options object\n * @throws {Error} If value of `r` attribute is missing or invalid\n */\n\n fabric.Circle.fromElement = function (element, callback) {\n var parsedAttributes = fabric.parseAttributes(element, fabric.Circle.ATTRIBUTE_NAMES);\n\n if (!isValidRadius(parsedAttributes)) {\n throw new Error('value of `r` attribute is required and can not be negative');\n }\n\n parsedAttributes.left = (parsedAttributes.left || 0) - parsedAttributes.radius;\n parsedAttributes.top = (parsedAttributes.top || 0) - parsedAttributes.radius;\n callback(new fabric.Circle(parsedAttributes));\n };\n /**\n * @private\n */\n\n\n function isValidRadius(attributes) {\n return 'radius' in attributes && attributes.radius >= 0;\n }\n /* _FROM_SVG_END_ */\n\n /**\n * Returns {@link fabric.Circle} instance from an object representation\n * @static\n * @memberOf fabric.Circle\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] invoked with new instance as first argument\n * @return {Object} Instance of fabric.Circle\n */\n\n\n fabric.Circle.fromObject = function (object, callback) {\n return fabric.Object._fromObject('Circle', object, callback);\n };\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {});\n\n if (fabric.Triangle) {\n fabric.warn('fabric.Triangle is already defined');\n return;\n }\n /**\n * Triangle class\n * @class fabric.Triangle\n * @extends fabric.Object\n * @return {fabric.Triangle} thisArg\n * @see {@link fabric.Triangle#initialize} for constructor definition\n */\n\n\n fabric.Triangle = fabric.util.createClass(fabric.Object,\n /** @lends fabric.Triangle.prototype */\n {\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'triangle',\n\n /**\n * Width is set to 100 to compensate the old initialize code that was setting it to 100\n * @type Number\n * @default\n */\n width: 100,\n\n /**\n * Height is set to 100 to compensate the old initialize code that was setting it to 100\n * @type Number\n * @default\n */\n height: 100,\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _render: function (ctx) {\n var widthBy2 = this.width / 2,\n heightBy2 = this.height / 2;\n ctx.beginPath();\n ctx.moveTo(-widthBy2, heightBy2);\n ctx.lineTo(0, -heightBy2);\n ctx.lineTo(widthBy2, heightBy2);\n ctx.closePath();\n\n this._renderPaintInOrder(ctx);\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderDashedStroke: function (ctx) {\n var widthBy2 = this.width / 2,\n heightBy2 = this.height / 2;\n ctx.beginPath();\n fabric.util.drawDashedLine(ctx, -widthBy2, heightBy2, 0, -heightBy2, this.strokeDashArray);\n fabric.util.drawDashedLine(ctx, 0, -heightBy2, widthBy2, heightBy2, this.strokeDashArray);\n fabric.util.drawDashedLine(ctx, widthBy2, heightBy2, -widthBy2, heightBy2, this.strokeDashArray);\n ctx.closePath();\n },\n\n /* _TO_SVG_START_ */\n\n /**\n * Returns svg representation of an instance\n * @return {Array} an array of strings with the specific svg representation\n * of the instance\n */\n _toSVG: function () {\n var widthBy2 = this.width / 2,\n heightBy2 = this.height / 2,\n points = [-widthBy2 + ' ' + heightBy2, '0 ' + -heightBy2, widthBy2 + ' ' + heightBy2].join(',');\n return ['<polygon ', 'COMMON_PARTS', 'points=\"', points, '\" />'];\n }\n /* _TO_SVG_END_ */\n\n });\n /**\n * Returns {@link fabric.Triangle} instance from an object representation\n * @static\n * @memberOf fabric.Triangle\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] invoked with new instance as first argument\n */\n\n fabric.Triangle.fromObject = function (object, callback) {\n return fabric.Object._fromObject('Triangle', object, callback);\n };\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n piBy2 = Math.PI * 2;\n\n if (fabric.Ellipse) {\n fabric.warn('fabric.Ellipse is already defined.');\n return;\n }\n /**\n * Ellipse class\n * @class fabric.Ellipse\n * @extends fabric.Object\n * @return {fabric.Ellipse} thisArg\n * @see {@link fabric.Ellipse#initialize} for constructor definition\n */\n\n\n fabric.Ellipse = fabric.util.createClass(fabric.Object,\n /** @lends fabric.Ellipse.prototype */\n {\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'ellipse',\n\n /**\n * Horizontal radius\n * @type Number\n * @default\n */\n rx: 0,\n\n /**\n * Vertical radius\n * @type Number\n * @default\n */\n ry: 0,\n cacheProperties: fabric.Object.prototype.cacheProperties.concat('rx', 'ry'),\n\n /**\n * Constructor\n * @param {Object} [options] Options object\n * @return {fabric.Ellipse} thisArg\n */\n initialize: function (options) {\n this.callSuper('initialize', options);\n this.set('rx', options && options.rx || 0);\n this.set('ry', options && options.ry || 0);\n },\n\n /**\n * @private\n * @param {String} key\n * @param {*} value\n * @return {fabric.Ellipse} thisArg\n */\n _set: function (key, value) {\n this.callSuper('_set', key, value);\n\n switch (key) {\n case 'rx':\n this.rx = value;\n this.set('width', value * 2);\n break;\n\n case 'ry':\n this.ry = value;\n this.set('height', value * 2);\n break;\n }\n\n return this;\n },\n\n /**\n * Returns horizontal radius of an object (according to how an object is scaled)\n * @return {Number}\n */\n getRx: function () {\n return this.get('rx') * this.get('scaleX');\n },\n\n /**\n * Returns Vertical radius of an object (according to how an object is scaled)\n * @return {Number}\n */\n getRy: function () {\n return this.get('ry') * this.get('scaleY');\n },\n\n /**\n * Returns object representation of an instance\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} object representation of an instance\n */\n toObject: function (propertiesToInclude) {\n return this.callSuper('toObject', ['rx', 'ry'].concat(propertiesToInclude));\n },\n\n /* _TO_SVG_START_ */\n\n /**\n * Returns svg representation of an instance\n * @return {Array} an array of strings with the specific svg representation\n * of the instance\n */\n _toSVG: function () {\n return ['<ellipse ', 'COMMON_PARTS', 'cx=\"0\" cy=\"0\" ', 'rx=\"', this.rx, '\" ry=\"', this.ry, '\" />\\n'];\n },\n\n /* _TO_SVG_END_ */\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx context to render on\n */\n _render: function (ctx) {\n ctx.beginPath();\n ctx.save();\n ctx.transform(1, 0, 0, this.ry / this.rx, 0, 0);\n ctx.arc(0, 0, this.rx, 0, piBy2, false);\n ctx.restore();\n\n this._renderPaintInOrder(ctx);\n }\n });\n /* _FROM_SVG_START_ */\n\n /**\n * List of attribute names to account for when parsing SVG element (used by {@link fabric.Ellipse.fromElement})\n * @static\n * @memberOf fabric.Ellipse\n * @see http://www.w3.org/TR/SVG/shapes.html#EllipseElement\n */\n\n fabric.Ellipse.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat('cx cy rx ry'.split(' '));\n /**\n * Returns {@link fabric.Ellipse} instance from an SVG element\n * @static\n * @memberOf fabric.Ellipse\n * @param {SVGElement} element Element to parse\n * @param {Function} [callback] Options callback invoked after parsing is finished\n * @return {fabric.Ellipse}\n */\n\n fabric.Ellipse.fromElement = function (element, callback) {\n var parsedAttributes = fabric.parseAttributes(element, fabric.Ellipse.ATTRIBUTE_NAMES);\n parsedAttributes.left = (parsedAttributes.left || 0) - parsedAttributes.rx;\n parsedAttributes.top = (parsedAttributes.top || 0) - parsedAttributes.ry;\n callback(new fabric.Ellipse(parsedAttributes));\n };\n /* _FROM_SVG_END_ */\n\n /**\n * Returns {@link fabric.Ellipse} instance from an object representation\n * @static\n * @memberOf fabric.Ellipse\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] invoked with new instance as first argument\n * @return {fabric.Ellipse}\n */\n\n\n fabric.Ellipse.fromObject = function (object, callback) {\n return fabric.Object._fromObject('Ellipse', object, callback);\n };\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n extend = fabric.util.object.extend;\n\n if (fabric.Rect) {\n fabric.warn('fabric.Rect is already defined');\n return;\n }\n /**\n * Rectangle class\n * @class fabric.Rect\n * @extends fabric.Object\n * @return {fabric.Rect} thisArg\n * @see {@link fabric.Rect#initialize} for constructor definition\n */\n\n\n fabric.Rect = fabric.util.createClass(fabric.Object,\n /** @lends fabric.Rect.prototype */\n {\n /**\n * List of properties to consider when checking if state of an object is changed ({@link fabric.Object#hasStateChanged})\n * as well as for history (undo/redo) purposes\n * @type Array\n */\n stateProperties: fabric.Object.prototype.stateProperties.concat('rx', 'ry'),\n\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'rect',\n\n /**\n * Horizontal border radius\n * @type Number\n * @default\n */\n rx: 0,\n\n /**\n * Vertical border radius\n * @type Number\n * @default\n */\n ry: 0,\n cacheProperties: fabric.Object.prototype.cacheProperties.concat('rx', 'ry'),\n\n /**\n * Constructor\n * @param {Object} [options] Options object\n * @return {Object} thisArg\n */\n initialize: function (options) {\n this.callSuper('initialize', options);\n\n this._initRxRy();\n },\n\n /**\n * Initializes rx/ry attributes\n * @private\n */\n _initRxRy: function () {\n if (this.rx && !this.ry) {\n this.ry = this.rx;\n } else if (this.ry && !this.rx) {\n this.rx = this.ry;\n }\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _render: function (ctx) {\n // 1x1 case (used in spray brush) optimization was removed because\n // with caching and higher zoom level this makes more damage than help\n var rx = this.rx ? Math.min(this.rx, this.width / 2) : 0,\n ry = this.ry ? Math.min(this.ry, this.height / 2) : 0,\n w = this.width,\n h = this.height,\n x = -this.width / 2,\n y = -this.height / 2,\n isRounded = rx !== 0 || ry !== 0,\n\n /* \"magic number\" for bezier approximations of arcs (http://itc.ktu.lt/itc354/Riskus354.pdf) */\n k = 1 - 0.5522847498;\n ctx.beginPath();\n ctx.moveTo(x + rx, y);\n ctx.lineTo(x + w - rx, y);\n isRounded && ctx.bezierCurveTo(x + w - k * rx, y, x + w, y + k * ry, x + w, y + ry);\n ctx.lineTo(x + w, y + h - ry);\n isRounded && ctx.bezierCurveTo(x + w, y + h - k * ry, x + w - k * rx, y + h, x + w - rx, y + h);\n ctx.lineTo(x + rx, y + h);\n isRounded && ctx.bezierCurveTo(x + k * rx, y + h, x, y + h - k * ry, x, y + h - ry);\n ctx.lineTo(x, y + ry);\n isRounded && ctx.bezierCurveTo(x, y + k * ry, x + k * rx, y, x + rx, y);\n ctx.closePath();\n\n this._renderPaintInOrder(ctx);\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderDashedStroke: function (ctx) {\n var x = -this.width / 2,\n y = -this.height / 2,\n w = this.width,\n h = this.height;\n ctx.beginPath();\n fabric.util.drawDashedLine(ctx, x, y, x + w, y, this.strokeDashArray);\n fabric.util.drawDashedLine(ctx, x + w, y, x + w, y + h, this.strokeDashArray);\n fabric.util.drawDashedLine(ctx, x + w, y + h, x, y + h, this.strokeDashArray);\n fabric.util.drawDashedLine(ctx, x, y + h, x, y, this.strokeDashArray);\n ctx.closePath();\n },\n\n /**\n * Returns object representation of an instance\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} object representation of an instance\n */\n toObject: function (propertiesToInclude) {\n return this.callSuper('toObject', ['rx', 'ry'].concat(propertiesToInclude));\n },\n\n /* _TO_SVG_START_ */\n\n /**\n * Returns svg representation of an instance\n * @return {Array} an array of strings with the specific svg representation\n * of the instance\n */\n _toSVG: function () {\n var x = -this.width / 2,\n y = -this.height / 2;\n return ['<rect ', 'COMMON_PARTS', 'x=\"', x, '\" y=\"', y, '\" rx=\"', this.rx, '\" ry=\"', this.ry, '\" width=\"', this.width, '\" height=\"', this.height, '\" />\\n'];\n }\n /* _TO_SVG_END_ */\n\n });\n /* _FROM_SVG_START_ */\n\n /**\n * List of attribute names to account for when parsing SVG element (used by `fabric.Rect.fromElement`)\n * @static\n * @memberOf fabric.Rect\n * @see: http://www.w3.org/TR/SVG/shapes.html#RectElement\n */\n\n fabric.Rect.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat('x y rx ry width height'.split(' '));\n /**\n * Returns {@link fabric.Rect} instance from an SVG element\n * @static\n * @memberOf fabric.Rect\n * @param {SVGElement} element Element to parse\n * @param {Function} callback callback function invoked after parsing\n * @param {Object} [options] Options object\n */\n\n fabric.Rect.fromElement = function (element, callback, options) {\n if (!element) {\n return callback(null);\n }\n\n options = options || {};\n var parsedAttributes = fabric.parseAttributes(element, fabric.Rect.ATTRIBUTE_NAMES);\n parsedAttributes.left = parsedAttributes.left || 0;\n parsedAttributes.top = parsedAttributes.top || 0;\n parsedAttributes.height = parsedAttributes.height || 0;\n parsedAttributes.width = parsedAttributes.width || 0;\n var rect = new fabric.Rect(extend(options ? fabric.util.object.clone(options) : {}, parsedAttributes));\n rect.visible = rect.visible && rect.width > 0 && rect.height > 0;\n callback(rect);\n };\n /* _FROM_SVG_END_ */\n\n /**\n * Returns {@link fabric.Rect} instance from an object representation\n * @static\n * @memberOf fabric.Rect\n * @param {Object} object Object to create an instance from\n * @param {Function} [callback] Callback to invoke when an fabric.Rect instance is created\n */\n\n\n fabric.Rect.fromObject = function (object, callback) {\n return fabric.Object._fromObject('Rect', object, callback);\n };\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n extend = fabric.util.object.extend,\n min = fabric.util.array.min,\n max = fabric.util.array.max,\n toFixed = fabric.util.toFixed;\n\n if (fabric.Polyline) {\n fabric.warn('fabric.Polyline is already defined');\n return;\n }\n /**\n * Polyline class\n * @class fabric.Polyline\n * @extends fabric.Object\n * @see {@link fabric.Polyline#initialize} for constructor definition\n */\n\n\n fabric.Polyline = fabric.util.createClass(fabric.Object,\n /** @lends fabric.Polyline.prototype */\n {\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'polyline',\n\n /**\n * Points array\n * @type Array\n * @default\n */\n points: null,\n cacheProperties: fabric.Object.prototype.cacheProperties.concat('points'),\n\n /**\n * Constructor\n * @param {Array} points Array of points (where each point is an object with x and y)\n * @param {Object} [options] Options object\n * @return {fabric.Polyline} thisArg\n * @example\n * var poly = new fabric.Polyline([\n * { x: 10, y: 10 },\n * { x: 50, y: 30 },\n * { x: 40, y: 70 },\n * { x: 60, y: 50 },\n * { x: 100, y: 150 },\n * { x: 40, y: 100 }\n * ], {\n * stroke: 'red',\n * left: 100,\n * top: 100\n * });\n */\n initialize: function (points, options) {\n options = options || {};\n this.points = points || [];\n this.callSuper('initialize', options);\n\n this._setPositionDimensions(options);\n },\n _setPositionDimensions: function (options) {\n var calcDim = this._calcDimensions(options),\n correctLeftTop;\n\n this.width = calcDim.width;\n this.height = calcDim.height;\n\n if (!options.fromSVG) {\n correctLeftTop = this.translateToGivenOrigin({\n x: calcDim.left - this.strokeWidth / 2,\n y: calcDim.top - this.strokeWidth / 2\n }, 'left', 'top', this.originX, this.originY);\n }\n\n if (typeof options.left === 'undefined') {\n this.left = options.fromSVG ? calcDim.left : correctLeftTop.x;\n }\n\n if (typeof options.top === 'undefined') {\n this.top = options.fromSVG ? calcDim.top : correctLeftTop.y;\n }\n\n this.pathOffset = {\n x: calcDim.left + this.width / 2,\n y: calcDim.top + this.height / 2\n };\n },\n\n /**\n * Calculate the polygon min and max point from points array,\n * returning an object with left, top, widht, height to measure the\n * polygon size\n * @return {Object} object.left X coordinate of the polygon leftmost point\n * @return {Object} object.top Y coordinate of the polygon topmost point\n * @return {Object} object.width distance between X coordinates of the polygon leftmost and rightmost point\n * @return {Object} object.height distance between Y coordinates of the polygon topmost and bottommost point\n * @private\n */\n _calcDimensions: function () {\n var points = this.points,\n minX = min(points, 'x') || 0,\n minY = min(points, 'y') || 0,\n maxX = max(points, 'x') || 0,\n maxY = max(points, 'y') || 0,\n width = maxX - minX,\n height = maxY - minY;\n return {\n left: minX,\n top: minY,\n width: width,\n height: height\n };\n },\n\n /**\n * Returns object representation of an instance\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} Object representation of an instance\n */\n toObject: function (propertiesToInclude) {\n return extend(this.callSuper('toObject', propertiesToInclude), {\n points: this.points.concat()\n });\n },\n\n /* _TO_SVG_START_ */\n\n /**\n * Returns svg representation of an instance\n * @return {Array} an array of strings with the specific svg representation\n * of the instance\n */\n _toSVG: function () {\n var points = [],\n diffX = this.pathOffset.x,\n diffY = this.pathOffset.y,\n NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS;\n\n for (var i = 0, len = this.points.length; i < len; i++) {\n points.push(toFixed(this.points[i].x - diffX, NUM_FRACTION_DIGITS), ',', toFixed(this.points[i].y - diffY, NUM_FRACTION_DIGITS), ' ');\n }\n\n return ['<' + this.type + ' ', 'COMMON_PARTS', 'points=\"', points.join(''), '\" />\\n'];\n },\n\n /* _TO_SVG_END_ */\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n commonRender: function (ctx) {\n var point,\n len = this.points.length,\n x = this.pathOffset.x,\n y = this.pathOffset.y;\n\n if (!len || isNaN(this.points[len - 1].y)) {\n // do not draw if no points or odd points\n // NaN comes from parseFloat of a empty string in parser\n return false;\n }\n\n ctx.beginPath();\n ctx.moveTo(this.points[0].x - x, this.points[0].y - y);\n\n for (var i = 0; i < len; i++) {\n point = this.points[i];\n ctx.lineTo(point.x - x, point.y - y);\n }\n\n return true;\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _render: function (ctx) {\n if (!this.commonRender(ctx)) {\n return;\n }\n\n this._renderPaintInOrder(ctx);\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderDashedStroke: function (ctx) {\n var p1, p2;\n ctx.beginPath();\n\n for (var i = 0, len = this.points.length; i < len; i++) {\n p1 = this.points[i];\n p2 = this.points[i + 1] || p1;\n fabric.util.drawDashedLine(ctx, p1.x, p1.y, p2.x, p2.y, this.strokeDashArray);\n }\n },\n\n /**\n * Returns complexity of an instance\n * @return {Number} complexity of this instance\n */\n complexity: function () {\n return this.get('points').length;\n }\n });\n /* _FROM_SVG_START_ */\n\n /**\n * List of attribute names to account for when parsing SVG element (used by {@link fabric.Polyline.fromElement})\n * @static\n * @memberOf fabric.Polyline\n * @see: http://www.w3.org/TR/SVG/shapes.html#PolylineElement\n */\n\n fabric.Polyline.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat();\n /**\n * Returns fabric.Polyline instance from an SVG element\n * @static\n * @memberOf fabric.Polyline\n * @param {SVGElement} element Element to parser\n * @param {Function} callback callback function invoked after parsing\n * @param {Object} [options] Options object\n */\n\n fabric.Polyline.fromElementGenerator = function (_class) {\n return function (element, callback, options) {\n if (!element) {\n return callback(null);\n }\n\n options || (options = {});\n var points = fabric.parsePointsAttribute(element.getAttribute('points')),\n parsedAttributes = fabric.parseAttributes(element, fabric[_class].ATTRIBUTE_NAMES);\n parsedAttributes.fromSVG = true;\n callback(new fabric[_class](points, extend(parsedAttributes, options)));\n };\n };\n\n fabric.Polyline.fromElement = fabric.Polyline.fromElementGenerator('Polyline');\n /* _FROM_SVG_END_ */\n\n /**\n * Returns fabric.Polyline instance from an object representation\n * @static\n * @memberOf fabric.Polyline\n * @param {Object} object Object to create an instance from\n * @param {Function} [callback] Callback to invoke when an fabric.Path instance is created\n */\n\n fabric.Polyline.fromObject = function (object, callback) {\n return fabric.Object._fromObject('Polyline', object, callback, 'points');\n };\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {});\n\n if (fabric.Polygon) {\n fabric.warn('fabric.Polygon is already defined');\n return;\n }\n /**\n * Polygon class\n * @class fabric.Polygon\n * @extends fabric.Polyline\n * @see {@link fabric.Polygon#initialize} for constructor definition\n */\n\n\n fabric.Polygon = fabric.util.createClass(fabric.Polyline,\n /** @lends fabric.Polygon.prototype */\n {\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'polygon',\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _render: function (ctx) {\n if (!this.commonRender(ctx)) {\n return;\n }\n\n ctx.closePath();\n\n this._renderPaintInOrder(ctx);\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderDashedStroke: function (ctx) {\n this.callSuper('_renderDashedStroke', ctx);\n ctx.closePath();\n }\n });\n /* _FROM_SVG_START_ */\n\n /**\n * List of attribute names to account for when parsing SVG element (used by `fabric.Polygon.fromElement`)\n * @static\n * @memberOf fabric.Polygon\n * @see: http://www.w3.org/TR/SVG/shapes.html#PolygonElement\n */\n\n fabric.Polygon.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat();\n /**\n * Returns {@link fabric.Polygon} instance from an SVG element\n * @static\n * @memberOf fabric.Polygon\n * @param {SVGElement} element Element to parse\n * @param {Function} callback callback function invoked after parsing\n * @param {Object} [options] Options object\n */\n\n fabric.Polygon.fromElement = fabric.Polyline.fromElementGenerator('Polygon');\n /* _FROM_SVG_END_ */\n\n /**\n * Returns fabric.Polygon instance from an object representation\n * @static\n * @memberOf fabric.Polygon\n * @param {Object} object Object to create an instance from\n * @param {Function} [callback] Callback to invoke when an fabric.Path instance is created\n */\n\n fabric.Polygon.fromObject = function (object, callback) {\n return fabric.Object._fromObject('Polygon', object, callback, 'points');\n };\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n min = fabric.util.array.min,\n max = fabric.util.array.max,\n extend = fabric.util.object.extend,\n _toString = Object.prototype.toString,\n toFixed = fabric.util.toFixed;\n\n if (fabric.Path) {\n fabric.warn('fabric.Path is already defined');\n return;\n }\n /**\n * Path class\n * @class fabric.Path\n * @extends fabric.Object\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-1#path_and_pathgroup}\n * @see {@link fabric.Path#initialize} for constructor definition\n */\n\n\n fabric.Path = fabric.util.createClass(fabric.Object,\n /** @lends fabric.Path.prototype */\n {\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'path',\n\n /**\n * Array of path points\n * @type Array\n * @default\n */\n path: null,\n cacheProperties: fabric.Object.prototype.cacheProperties.concat('path', 'fillRule'),\n stateProperties: fabric.Object.prototype.stateProperties.concat('path'),\n\n /**\n * Constructor\n * @param {Array|String} path Path data (sequence of coordinates and corresponding \"command\" tokens)\n * @param {Object} [options] Options object\n * @return {fabric.Path} thisArg\n */\n initialize: function (path, options) {\n options = options || {};\n this.callSuper('initialize', options);\n\n if (!path) {\n path = [];\n }\n\n var fromArray = _toString.call(path) === '[object Array]';\n this.path = fromArray ? fabric.util.makePathSimpler(path) : fabric.util.makePathSimpler(fabric.util.parsePath(path));\n\n if (!this.path) {\n return;\n }\n\n fabric.Polyline.prototype._setPositionDimensions.call(this, options);\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx context to render path on\n */\n _renderPathCommands: function (ctx) {\n var current,\n // current instruction\n subpathStartX = 0,\n subpathStartY = 0,\n x = 0,\n // current x\n y = 0,\n // current y\n controlX = 0,\n // current control point x\n controlY = 0,\n // current control point y\n l = -this.pathOffset.x,\n t = -this.pathOffset.y;\n ctx.beginPath();\n\n for (var i = 0, len = this.path.length; i < len; ++i) {\n current = this.path[i];\n\n switch (current[0]) {\n // first letter\n case 'L':\n // lineto, absolute\n x = current[1];\n y = current[2];\n ctx.lineTo(x + l, y + t);\n break;\n\n case 'M':\n // moveTo, absolute\n x = current[1];\n y = current[2];\n subpathStartX = x;\n subpathStartY = y;\n ctx.moveTo(x + l, y + t);\n break;\n\n case 'C':\n // bezierCurveTo, absolute\n x = current[5];\n y = current[6];\n controlX = current[3];\n controlY = current[4];\n ctx.bezierCurveTo(current[1] + l, current[2] + t, controlX + l, controlY + t, x + l, y + t);\n break;\n\n case 'Q':\n // quadraticCurveTo, absolute\n ctx.quadraticCurveTo(current[1] + l, current[2] + t, current[3] + l, current[4] + t);\n x = current[3];\n y = current[4];\n controlX = current[1];\n controlY = current[2];\n break;\n\n case 'z':\n case 'Z':\n x = subpathStartX;\n y = subpathStartY;\n ctx.closePath();\n break;\n }\n }\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx context to render path on\n */\n _render: function (ctx) {\n this._renderPathCommands(ctx);\n\n this._renderPaintInOrder(ctx);\n },\n\n /**\n * Returns string representation of an instance\n * @return {String} string representation of an instance\n */\n toString: function () {\n return '#<fabric.Path (' + this.complexity() + '): { \"top\": ' + this.top + ', \"left\": ' + this.left + ' }>';\n },\n\n /**\n * Returns object representation of an instance\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} object representation of an instance\n */\n toObject: function (propertiesToInclude) {\n return extend(this.callSuper('toObject', propertiesToInclude), {\n path: this.path.map(function (item) {\n return item.slice();\n })\n });\n },\n\n /**\n * Returns dataless object representation of an instance\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} object representation of an instance\n */\n toDatalessObject: function (propertiesToInclude) {\n var o = this.toObject(['sourcePath'].concat(propertiesToInclude));\n\n if (o.sourcePath) {\n delete o.path;\n }\n\n return o;\n },\n\n /* _TO_SVG_START_ */\n\n /**\n * Returns svg representation of an instance\n * @return {Array} an array of strings with the specific svg representation\n * of the instance\n */\n _toSVG: function () {\n var path = this.path.map(function (path) {\n return path.join(' ');\n }).join(' ');\n return ['<path ', 'COMMON_PARTS', 'd=\"', path, '\" stroke-linecap=\"round\" ', '/>\\n'];\n },\n _getOffsetTransform: function () {\n var digits = fabric.Object.NUM_FRACTION_DIGITS;\n return ' translate(' + toFixed(-this.pathOffset.x, digits) + ', ' + toFixed(-this.pathOffset.y, digits) + ')';\n },\n\n /**\n * Returns svg clipPath representation of an instance\n * @param {Function} [reviver] Method for further parsing of svg representation.\n * @return {String} svg representation of an instance\n */\n toClipPathSVG: function (reviver) {\n var additionalTransform = this._getOffsetTransform();\n\n return '\\t' + this._createBaseClipPathSVGMarkup(this._toSVG(), {\n reviver: reviver,\n additionalTransform: additionalTransform\n });\n },\n\n /**\n * Returns svg representation of an instance\n * @param {Function} [reviver] Method for further parsing of svg representation.\n * @return {String} svg representation of an instance\n */\n toSVG: function (reviver) {\n var additionalTransform = this._getOffsetTransform();\n\n return this._createBaseSVGMarkup(this._toSVG(), {\n reviver: reviver,\n additionalTransform: additionalTransform\n });\n },\n\n /* _TO_SVG_END_ */\n\n /**\n * Returns number representation of an instance complexity\n * @return {Number} complexity of this instance\n */\n complexity: function () {\n return this.path.length;\n },\n\n /**\n * @private\n */\n _calcDimensions: function () {\n var aX = [],\n aY = [],\n current,\n // current instruction\n subpathStartX = 0,\n subpathStartY = 0,\n x = 0,\n // current x\n y = 0,\n // current y\n bounds;\n\n for (var i = 0, len = this.path.length; i < len; ++i) {\n current = this.path[i];\n\n switch (current[0]) {\n // first letter\n case 'L':\n // lineto, absolute\n x = current[1];\n y = current[2];\n bounds = [];\n break;\n\n case 'M':\n // moveTo, absolute\n x = current[1];\n y = current[2];\n subpathStartX = x;\n subpathStartY = y;\n bounds = [];\n break;\n\n case 'C':\n // bezierCurveTo, absolute\n bounds = fabric.util.getBoundsOfCurve(x, y, current[1], current[2], current[3], current[4], current[5], current[6]);\n x = current[5];\n y = current[6];\n break;\n\n case 'Q':\n // quadraticCurveTo, absolute\n bounds = fabric.util.getBoundsOfCurve(x, y, current[1], current[2], current[1], current[2], current[3], current[4]);\n x = current[3];\n y = current[4];\n break;\n\n case 'z':\n case 'Z':\n x = subpathStartX;\n y = subpathStartY;\n break;\n }\n\n bounds.forEach(function (point) {\n aX.push(point.x);\n aY.push(point.y);\n });\n aX.push(x);\n aY.push(y);\n }\n\n var minX = min(aX) || 0,\n minY = min(aY) || 0,\n maxX = max(aX) || 0,\n maxY = max(aY) || 0,\n deltaX = maxX - minX,\n deltaY = maxY - minY;\n return {\n left: minX,\n top: minY,\n width: deltaX,\n height: deltaY\n };\n }\n });\n /**\n * Creates an instance of fabric.Path from an object\n * @static\n * @memberOf fabric.Path\n * @param {Object} object\n * @param {Function} [callback] Callback to invoke when an fabric.Path instance is created\n */\n\n fabric.Path.fromObject = function (object, callback) {\n if (typeof object.sourcePath === 'string') {\n var pathUrl = object.sourcePath;\n fabric.loadSVGFromURL(pathUrl, function (elements) {\n var path = elements[0];\n path.setOptions(object);\n callback && callback(path);\n });\n } else {\n fabric.Object._fromObject('Path', object, callback, 'path');\n }\n };\n /* _FROM_SVG_START_ */\n\n /**\n * List of attribute names to account for when parsing SVG element (used by `fabric.Path.fromElement`)\n * @static\n * @memberOf fabric.Path\n * @see http://www.w3.org/TR/SVG/paths.html#PathElement\n */\n\n\n fabric.Path.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat(['d']);\n /**\n * Creates an instance of fabric.Path from an SVG <path> element\n * @static\n * @memberOf fabric.Path\n * @param {SVGElement} element to parse\n * @param {Function} callback Callback to invoke when an fabric.Path instance is created\n * @param {Object} [options] Options object\n * @param {Function} [callback] Options callback invoked after parsing is finished\n */\n\n fabric.Path.fromElement = function (element, callback, options) {\n var parsedAttributes = fabric.parseAttributes(element, fabric.Path.ATTRIBUTE_NAMES);\n parsedAttributes.fromSVG = true;\n callback(new fabric.Path(parsedAttributes.d, extend(parsedAttributes, options)));\n };\n /* _FROM_SVG_END_ */\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n min = fabric.util.array.min,\n max = fabric.util.array.max;\n\n if (fabric.Group) {\n return;\n }\n /**\n * Group class\n * @class fabric.Group\n * @extends fabric.Object\n * @mixes fabric.Collection\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-3#groups}\n * @see {@link fabric.Group#initialize} for constructor definition\n */\n\n\n fabric.Group = fabric.util.createClass(fabric.Object, fabric.Collection,\n /** @lends fabric.Group.prototype */\n {\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'group',\n\n /**\n * Width of stroke\n * @type Number\n * @default\n */\n strokeWidth: 0,\n\n /**\n * Indicates if click, mouseover, mouseout events & hoverCursor should also check for subtargets\n * @type Boolean\n * @default\n */\n subTargetCheck: false,\n\n /**\n * Groups are container, do not render anything on theyr own, ence no cache properties\n * @type Array\n * @default\n */\n cacheProperties: [],\n\n /**\n * setOnGroup is a method used for TextBox that is no more used since 2.0.0 The behavior is still\n * available setting this boolean to true.\n * @type Boolean\n * @since 2.0.0\n * @default\n */\n useSetOnGroup: false,\n\n /**\n * Constructor\n * @param {Object} objects Group objects\n * @param {Object} [options] Options object\n * @param {Boolean} [isAlreadyGrouped] if true, objects have been grouped already.\n * @return {Object} thisArg\n */\n initialize: function (objects, options, isAlreadyGrouped) {\n options = options || {};\n this._objects = []; // if objects enclosed in a group have been grouped already,\n // we cannot change properties of objects.\n // Thus we need to set options to group without objects,\n\n isAlreadyGrouped && this.callSuper('initialize', options);\n this._objects = objects || [];\n\n for (var i = this._objects.length; i--;) {\n this._objects[i].group = this;\n }\n\n if (!isAlreadyGrouped) {\n var center = options && options.centerPoint; // we want to set origins before calculating the bounding box.\n // so that the topleft can be set with that in mind.\n // if specific top and left are passed, are overwritten later\n // with the callSuper('initialize', options)\n\n if (options.originX !== undefined) {\n this.originX = options.originX;\n }\n\n if (options.originY !== undefined) {\n this.originY = options.originY;\n } // if coming from svg i do not want to calc bounds.\n // i assume width and height are passed along options\n\n\n center || this._calcBounds();\n\n this._updateObjectsCoords(center);\n\n delete options.centerPoint;\n this.callSuper('initialize', options);\n } else {\n this._updateObjectsACoords();\n }\n\n this.setCoords();\n },\n\n /**\n * @private\n */\n _updateObjectsACoords: function () {\n var skipControls = true;\n\n for (var i = this._objects.length; i--;) {\n this._objects[i].setCoords(skipControls);\n }\n },\n\n /**\n * @private\n * @param {Boolean} [skipCoordsChange] if true, coordinates of objects enclosed in a group do not change\n */\n _updateObjectsCoords: function (center) {\n var center = center || this.getCenterPoint();\n\n for (var i = this._objects.length; i--;) {\n this._updateObjectCoords(this._objects[i], center);\n }\n },\n\n /**\n * @private\n * @param {Object} object\n * @param {fabric.Point} center, current center of group.\n */\n _updateObjectCoords: function (object, center) {\n var objectLeft = object.left,\n objectTop = object.top,\n skipControls = true;\n object.set({\n left: objectLeft - center.x,\n top: objectTop - center.y\n });\n object.group = this;\n object.setCoords(skipControls);\n },\n\n /**\n * Returns string represenation of a group\n * @return {String}\n */\n toString: function () {\n return '#<fabric.Group: (' + this.complexity() + ')>';\n },\n\n /**\n * Adds an object to a group; Then recalculates group's dimension, position.\n * @param {Object} object\n * @return {fabric.Group} thisArg\n * @chainable\n */\n addWithUpdate: function (object) {\n this._restoreObjectsState();\n\n fabric.util.resetObjectTransform(this);\n\n if (object) {\n this._objects.push(object);\n\n object.group = this;\n\n object._set('canvas', this.canvas);\n }\n\n this._calcBounds();\n\n this._updateObjectsCoords();\n\n this.setCoords();\n this.dirty = true;\n return this;\n },\n\n /**\n * Removes an object from a group; Then recalculates group's dimension, position.\n * @param {Object} object\n * @return {fabric.Group} thisArg\n * @chainable\n */\n removeWithUpdate: function (object) {\n this._restoreObjectsState();\n\n fabric.util.resetObjectTransform(this);\n this.remove(object);\n\n this._calcBounds();\n\n this._updateObjectsCoords();\n\n this.setCoords();\n this.dirty = true;\n return this;\n },\n\n /**\n * @private\n */\n _onObjectAdded: function (object) {\n this.dirty = true;\n object.group = this;\n\n object._set('canvas', this.canvas);\n },\n\n /**\n * @private\n */\n _onObjectRemoved: function (object) {\n this.dirty = true;\n delete object.group;\n },\n\n /**\n * @private\n */\n _set: function (key, value) {\n var i = this._objects.length;\n\n if (this.useSetOnGroup) {\n while (i--) {\n this._objects[i].setOnGroup(key, value);\n }\n }\n\n if (key === 'canvas') {\n while (i--) {\n this._objects[i]._set(key, value);\n }\n }\n\n fabric.Object.prototype._set.call(this, key, value);\n },\n\n /**\n * Returns object representation of an instance\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} object representation of an instance\n */\n toObject: function (propertiesToInclude) {\n var _includeDefaultValues = this.includeDefaultValues;\n\n var objsToObject = this._objects.map(function (obj) {\n var originalDefaults = obj.includeDefaultValues;\n obj.includeDefaultValues = _includeDefaultValues;\n\n var _obj = obj.toObject(propertiesToInclude);\n\n obj.includeDefaultValues = originalDefaults;\n return _obj;\n });\n\n var obj = fabric.Object.prototype.toObject.call(this, propertiesToInclude);\n obj.objects = objsToObject;\n return obj;\n },\n\n /**\n * Returns object representation of an instance, in dataless mode.\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} object representation of an instance\n */\n toDatalessObject: function (propertiesToInclude) {\n var objsToObject,\n sourcePath = this.sourcePath;\n\n if (sourcePath) {\n objsToObject = sourcePath;\n } else {\n var _includeDefaultValues = this.includeDefaultValues;\n objsToObject = this._objects.map(function (obj) {\n var originalDefaults = obj.includeDefaultValues;\n obj.includeDefaultValues = _includeDefaultValues;\n\n var _obj = obj.toDatalessObject(propertiesToInclude);\n\n obj.includeDefaultValues = originalDefaults;\n return _obj;\n });\n }\n\n var obj = fabric.Object.prototype.toDatalessObject.call(this, propertiesToInclude);\n obj.objects = objsToObject;\n return obj;\n },\n\n /**\n * Renders instance on a given context\n * @param {CanvasRenderingContext2D} ctx context to render instance on\n */\n render: function (ctx) {\n this._transformDone = true;\n this.callSuper('render', ctx);\n this._transformDone = false;\n },\n\n /**\n * Decide if the object should cache or not. Create its own cache level\n * needsItsOwnCache should be used when the object drawing method requires\n * a cache step. None of the fabric classes requires it.\n * Generally you do not cache objects in groups because the group is already cached.\n * @return {Boolean}\n */\n shouldCache: function () {\n var ownCache = fabric.Object.prototype.shouldCache.call(this);\n\n if (ownCache) {\n for (var i = 0, len = this._objects.length; i < len; i++) {\n if (this._objects[i].willDrawShadow()) {\n this.ownCaching = false;\n return false;\n }\n }\n }\n\n return ownCache;\n },\n\n /**\n * Check if this object or a child object will cast a shadow\n * @return {Boolean}\n */\n willDrawShadow: function () {\n if (fabric.Object.prototype.willDrawShadow.call(this)) {\n return true;\n }\n\n for (var i = 0, len = this._objects.length; i < len; i++) {\n if (this._objects[i].willDrawShadow()) {\n return true;\n }\n }\n\n return false;\n },\n\n /**\n * Check if this group or its parent group are caching, recursively up\n * @return {Boolean}\n */\n isOnACache: function () {\n return this.ownCaching || this.group && this.group.isOnACache();\n },\n\n /**\n * Execute the drawing operation for an object on a specified context\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n drawObject: function (ctx) {\n for (var i = 0, len = this._objects.length; i < len; i++) {\n this._objects[i].render(ctx);\n }\n\n this._drawClipPath(ctx);\n },\n\n /**\n * Check if cache is dirty\n */\n isCacheDirty: function (skipCanvas) {\n if (this.callSuper('isCacheDirty', skipCanvas)) {\n return true;\n }\n\n if (!this.statefullCache) {\n return false;\n }\n\n for (var i = 0, len = this._objects.length; i < len; i++) {\n if (this._objects[i].isCacheDirty(true)) {\n if (this._cacheCanvas) {\n // if this group has not a cache canvas there is nothing to clean\n var x = this.cacheWidth / this.zoomX,\n y = this.cacheHeight / this.zoomY;\n\n this._cacheContext.clearRect(-x / 2, -y / 2, x, y);\n }\n\n return true;\n }\n }\n\n return false;\n },\n\n /**\n * Retores original state of each of group objects (original state is that which was before group was created).\n * @private\n * @return {fabric.Group} thisArg\n * @chainable\n */\n _restoreObjectsState: function () {\n this._objects.forEach(this._restoreObjectState, this);\n\n return this;\n },\n\n /**\n * Realises the transform from this group onto the supplied object\n * i.e. it tells you what would happen if the supplied object was in\n * the group, and then the group was destroyed. It mutates the supplied\n * object.\n * @param {fabric.Object} object\n * @return {fabric.Object} transformedObject\n */\n realizeTransform: function (object) {\n var matrix = object.calcTransformMatrix(),\n options = fabric.util.qrDecompose(matrix),\n center = new fabric.Point(options.translateX, options.translateY);\n object.flipX = false;\n object.flipY = false;\n object.set('scaleX', options.scaleX);\n object.set('scaleY', options.scaleY);\n object.skewX = options.skewX;\n object.skewY = options.skewY;\n object.angle = options.angle;\n object.setPositionByOrigin(center, 'center', 'center');\n return object;\n },\n\n /**\n * Restores original state of a specified object in group\n * @private\n * @param {fabric.Object} object\n * @return {fabric.Group} thisArg\n */\n _restoreObjectState: function (object) {\n this.realizeTransform(object);\n delete object.group;\n object.setCoords();\n return this;\n },\n\n /**\n * Destroys a group (restoring state of its objects)\n * @return {fabric.Group} thisArg\n * @chainable\n */\n destroy: function () {\n // when group is destroyed objects needs to get a repaint to be eventually\n // displayed on canvas.\n this._objects.forEach(function (object) {\n object.set('dirty', true);\n });\n\n return this._restoreObjectsState();\n },\n\n /**\n * make a group an active selection, remove the group from canvas\n * the group has to be on canvas for this to work.\n * @return {fabric.ActiveSelection} thisArg\n * @chainable\n */\n toActiveSelection: function () {\n if (!this.canvas) {\n return;\n }\n\n var objects = this._objects,\n canvas = this.canvas;\n this._objects = [];\n var options = this.toObject();\n delete options.objects;\n var activeSelection = new fabric.ActiveSelection([]);\n activeSelection.set(options);\n activeSelection.type = 'activeSelection';\n canvas.remove(this);\n objects.forEach(function (object) {\n object.group = activeSelection;\n object.dirty = true;\n canvas.add(object);\n });\n activeSelection.canvas = canvas;\n activeSelection._objects = objects;\n canvas._activeObject = activeSelection;\n activeSelection.setCoords();\n return activeSelection;\n },\n\n /**\n * Destroys a group (restoring state of its objects)\n * @return {fabric.Group} thisArg\n * @chainable\n */\n ungroupOnCanvas: function () {\n return this._restoreObjectsState();\n },\n\n /**\n * Sets coordinates of all objects inside group\n * @return {fabric.Group} thisArg\n * @chainable\n */\n setObjectsCoords: function () {\n var skipControls = true;\n this.forEachObject(function (object) {\n object.setCoords(skipControls);\n });\n return this;\n },\n\n /**\n * @private\n */\n _calcBounds: function (onlyWidthHeight) {\n var aX = [],\n aY = [],\n o,\n prop,\n props = ['tr', 'br', 'bl', 'tl'],\n i = 0,\n iLen = this._objects.length,\n j,\n jLen = props.length;\n\n for (; i < iLen; ++i) {\n o = this._objects[i];\n o.aCoords = o.calcACoords();\n\n for (j = 0; j < jLen; j++) {\n prop = props[j];\n aX.push(o.aCoords[prop].x);\n aY.push(o.aCoords[prop].y);\n }\n }\n\n this._getBounds(aX, aY, onlyWidthHeight);\n },\n\n /**\n * @private\n */\n _getBounds: function (aX, aY, onlyWidthHeight) {\n var minXY = new fabric.Point(min(aX), min(aY)),\n maxXY = new fabric.Point(max(aX), max(aY)),\n top = minXY.y || 0,\n left = minXY.x || 0,\n width = maxXY.x - minXY.x || 0,\n height = maxXY.y - minXY.y || 0;\n this.width = width;\n this.height = height;\n\n if (!onlyWidthHeight) {\n // the bounding box always finds the topleft most corner.\n // whatever is the group origin, we set up here the left/top position.\n this.setPositionByOrigin({\n x: left,\n y: top\n }, 'left', 'top');\n }\n },\n\n /* _TO_SVG_START_ */\n\n /**\n * Returns svg representation of an instance\n * @param {Function} [reviver] Method for further parsing of svg representation.\n * @return {String} svg representation of an instance\n */\n _toSVG: function (reviver) {\n var svgString = ['<g ', 'COMMON_PARTS', ' >\\n'];\n\n for (var i = 0, len = this._objects.length; i < len; i++) {\n svgString.push('\\t\\t', this._objects[i].toSVG(reviver));\n }\n\n svgString.push('</g>\\n');\n return svgString;\n },\n\n /**\n * Returns styles-string for svg-export, specific version for group\n * @return {String}\n */\n getSvgStyles: function () {\n var opacity = typeof this.opacity !== 'undefined' && this.opacity !== 1 ? 'opacity: ' + this.opacity + ';' : '',\n visibility = this.visible ? '' : ' visibility: hidden;';\n return [opacity, this.getSvgFilter(), visibility].join('');\n },\n\n /**\n * Returns svg clipPath representation of an instance\n * @param {Function} [reviver] Method for further parsing of svg representation.\n * @return {String} svg representation of an instance\n */\n toClipPathSVG: function (reviver) {\n var svgString = [];\n\n for (var i = 0, len = this._objects.length; i < len; i++) {\n svgString.push('\\t', this._objects[i].toClipPathSVG(reviver));\n }\n\n return this._createBaseClipPathSVGMarkup(svgString, {\n reviver: reviver\n });\n }\n /* _TO_SVG_END_ */\n\n });\n /**\n * Returns {@link fabric.Group} instance from an object representation\n * @static\n * @memberOf fabric.Group\n * @param {Object} object Object to create a group from\n * @param {Function} [callback] Callback to invoke when an group instance is created\n */\n\n fabric.Group.fromObject = function (object, callback) {\n var objects = object.objects,\n options = fabric.util.object.clone(object, true);\n delete options.objects;\n\n if (typeof objects === 'string') {\n // it has to be an url or something went wrong.\n fabric.loadSVGFromURL(objects, function (elements) {\n var group = fabric.util.groupSVGElements(elements, object, objects);\n group.set(options);\n callback && callback(group);\n });\n return;\n }\n\n fabric.util.enlivenObjects(objects, function (enlivenedObjects) {\n fabric.util.enlivenObjects([object.clipPath], function (enlivedClipPath) {\n var options = fabric.util.object.clone(object, true);\n options.clipPath = enlivedClipPath[0];\n delete options.objects;\n callback && callback(new fabric.Group(enlivenedObjects, options, true));\n });\n });\n };\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {});\n\n if (fabric.ActiveSelection) {\n return;\n }\n /**\n * Group class\n * @class fabric.ActiveSelection\n * @extends fabric.Group\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-3#groups}\n * @see {@link fabric.ActiveSelection#initialize} for constructor definition\n */\n\n\n fabric.ActiveSelection = fabric.util.createClass(fabric.Group,\n /** @lends fabric.ActiveSelection.prototype */\n {\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'activeSelection',\n\n /**\n * Constructor\n * @param {Object} objects ActiveSelection objects\n * @param {Object} [options] Options object\n * @return {Object} thisArg\n */\n initialize: function (objects, options) {\n options = options || {};\n this._objects = objects || [];\n\n for (var i = this._objects.length; i--;) {\n this._objects[i].group = this;\n }\n\n if (options.originX) {\n this.originX = options.originX;\n }\n\n if (options.originY) {\n this.originY = options.originY;\n }\n\n this._calcBounds();\n\n this._updateObjectsCoords();\n\n fabric.Object.prototype.initialize.call(this, options);\n this.setCoords();\n },\n\n /**\n * Change te activeSelection to a normal group,\n * High level function that automatically adds it to canvas as\n * active object. no events fired.\n * @since 2.0.0\n * @return {fabric.Group}\n */\n toGroup: function () {\n var objects = this._objects.concat();\n\n this._objects = [];\n var options = fabric.Object.prototype.toObject.call(this);\n var newGroup = new fabric.Group([]);\n delete options.type;\n newGroup.set(options);\n objects.forEach(function (object) {\n object.canvas.remove(object);\n object.group = newGroup;\n });\n newGroup._objects = objects;\n\n if (!this.canvas) {\n return newGroup;\n }\n\n var canvas = this.canvas;\n canvas.add(newGroup);\n canvas._activeObject = newGroup;\n newGroup.setCoords();\n return newGroup;\n },\n\n /**\n * If returns true, deselection is cancelled.\n * @since 2.0.0\n * @return {Boolean} [cancel]\n */\n onDeselect: function () {\n this.destroy();\n return false;\n },\n\n /**\n * Returns string representation of a group\n * @return {String}\n */\n toString: function () {\n return '#<fabric.ActiveSelection: (' + this.complexity() + ')>';\n },\n\n /**\n * Decide if the object should cache or not. Create its own cache level\n * objectCaching is a global flag, wins over everything\n * needsItsOwnCache should be used when the object drawing method requires\n * a cache step. None of the fabric classes requires it.\n * Generally you do not cache objects in groups because the group outside is cached.\n * @return {Boolean}\n */\n shouldCache: function () {\n return false;\n },\n\n /**\n * Check if this group or its parent group are caching, recursively up\n * @return {Boolean}\n */\n isOnACache: function () {\n return false;\n },\n\n /**\n * Renders controls and borders for the object\n * @param {CanvasRenderingContext2D} ctx Context to render on\n * @param {Object} [styleOverride] properties to override the object style\n * @param {Object} [childrenOverride] properties to override the children overrides\n */\n _renderControls: function (ctx, styleOverride, childrenOverride) {\n ctx.save();\n ctx.globalAlpha = this.isMoving ? this.borderOpacityWhenMoving : 1;\n this.callSuper('_renderControls', ctx, styleOverride);\n childrenOverride = childrenOverride || {};\n\n if (typeof childrenOverride.hasControls === 'undefined') {\n childrenOverride.hasControls = false;\n }\n\n childrenOverride.forActiveSelection = true;\n\n for (var i = 0, len = this._objects.length; i < len; i++) {\n this._objects[i]._renderControls(ctx, childrenOverride);\n }\n\n ctx.restore();\n }\n });\n /**\n * Returns {@link fabric.ActiveSelection} instance from an object representation\n * @static\n * @memberOf fabric.ActiveSelection\n * @param {Object} object Object to create a group from\n * @param {Function} [callback] Callback to invoke when an ActiveSelection instance is created\n */\n\n fabric.ActiveSelection.fromObject = function (object, callback) {\n fabric.util.enlivenObjects(object.objects, function (enlivenedObjects) {\n delete object.objects;\n callback && callback(new fabric.ActiveSelection(enlivenedObjects, object, true));\n });\n };\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var extend = fabric.util.object.extend;\n\n if (!global.fabric) {\n global.fabric = {};\n }\n\n if (global.fabric.Image) {\n fabric.warn('fabric.Image is already defined.');\n return;\n }\n /**\n * Image class\n * @class fabric.Image\n * @extends fabric.Object\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-1#images}\n * @see {@link fabric.Image#initialize} for constructor definition\n */\n\n\n fabric.Image = fabric.util.createClass(fabric.Object,\n /** @lends fabric.Image.prototype */\n {\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'image',\n\n /**\n * Width of a stroke.\n * For image quality a stroke multiple of 2 gives better results.\n * @type Number\n * @default\n */\n strokeWidth: 0,\n\n /**\n * When calling {@link fabric.Image.getSrc}, return value from element src with `element.getAttribute('src')`.\n * This allows for relative urls as image src.\n * @since 2.7.0\n * @type Boolean\n * @default\n */\n srcFromAttribute: false,\n\n /**\n * private\n * contains last value of scaleX to detect\n * if the Image got resized after the last Render\n * @type Number\n */\n _lastScaleX: 1,\n\n /**\n * private\n * contains last value of scaleY to detect\n * if the Image got resized after the last Render\n * @type Number\n */\n _lastScaleY: 1,\n\n /**\n * private\n * contains last value of scaling applied by the apply filter chain\n * @type Number\n */\n _filterScalingX: 1,\n\n /**\n * private\n * contains last value of scaling applied by the apply filter chain\n * @type Number\n */\n _filterScalingY: 1,\n\n /**\n * minimum scale factor under which any resizeFilter is triggered to resize the image\n * 0 will disable the automatic resize. 1 will trigger automatically always.\n * number bigger than 1 are not implemented yet.\n * @type Number\n */\n minimumScaleTrigger: 0.5,\n\n /**\n * List of properties to consider when checking if\n * state of an object is changed ({@link fabric.Object#hasStateChanged})\n * as well as for history (undo/redo) purposes\n * @type Array\n */\n stateProperties: fabric.Object.prototype.stateProperties.concat('cropX', 'cropY'),\n\n /**\n * key used to retrieve the texture representing this image\n * @since 2.0.0\n * @type String\n * @default\n */\n cacheKey: '',\n\n /**\n * Image crop in pixels from original image size.\n * @since 2.0.0\n * @type Number\n * @default\n */\n cropX: 0,\n\n /**\n * Image crop in pixels from original image size.\n * @since 2.0.0\n * @type Number\n * @default\n */\n cropY: 0,\n\n /**\n * Indicates whether this canvas will use image smoothing when painting this image.\n * Also influence if the cacheCanvas for this image uses imageSmoothing\n * @since 4.0.0-beta.11\n * @type Boolean\n * @default\n */\n imageSmoothing: true,\n\n /**\n * Constructor\n * @param {HTMLImageElement | String} element Image element\n * @param {Object} [options] Options object\n * @param {function} [callback] callback function to call after eventual filters applied.\n * @return {fabric.Image} thisArg\n */\n initialize: function (element, options) {\n options || (options = {});\n this.filters = [];\n this.cacheKey = 'texture' + fabric.Object.__uid++;\n this.callSuper('initialize', options);\n\n this._initElement(element, options);\n },\n\n /**\n * Returns image element which this instance if based on\n * @return {HTMLImageElement} Image element\n */\n getElement: function () {\n return this._element || {};\n },\n\n /**\n * Sets image element for this instance to a specified one.\n * If filters defined they are applied to new image.\n * You might need to call `canvas.renderAll` and `object.setCoords` after replacing, to render new image and update controls area.\n * @param {HTMLImageElement} element\n * @param {Object} [options] Options object\n * @return {fabric.Image} thisArg\n * @chainable\n */\n setElement: function (element, options) {\n this.removeTexture(this.cacheKey);\n this.removeTexture(this.cacheKey + '_filtered');\n this._element = element;\n this._originalElement = element;\n\n this._initConfig(options);\n\n if (this.filters.length !== 0) {\n this.applyFilters();\n } // resizeFilters work on the already filtered copy.\n // we need to apply resizeFilters AFTER normal filters.\n // applyResizeFilters is run more often than normal fiters\n // and is triggered by user interactions rather than dev code\n\n\n if (this.resizeFilter) {\n this.applyResizeFilters();\n }\n\n return this;\n },\n\n /**\n * Delete a single texture if in webgl mode\n */\n removeTexture: function (key) {\n var backend = fabric.filterBackend;\n\n if (backend && backend.evictCachesForKey) {\n backend.evictCachesForKey(key);\n }\n },\n\n /**\n * Delete textures, reference to elements and eventually JSDOM cleanup\n */\n dispose: function () {\n this.removeTexture(this.cacheKey);\n this.removeTexture(this.cacheKey + '_filtered');\n this._cacheContext = undefined;\n ['_originalElement', '_element', '_filteredEl', '_cacheCanvas'].forEach(function (element) {\n fabric.util.cleanUpJsdomNode(this[element]);\n this[element] = undefined;\n }.bind(this));\n },\n\n /**\n * Get the crossOrigin value (of the corresponding image element)\n */\n getCrossOrigin: function () {\n return this._originalElement && (this._originalElement.crossOrigin || null);\n },\n\n /**\n * Returns original size of an image\n * @return {Object} Object with \"width\" and \"height\" properties\n */\n getOriginalSize: function () {\n var element = this.getElement();\n return {\n width: element.naturalWidth || element.width,\n height: element.naturalHeight || element.height\n };\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _stroke: function (ctx) {\n if (!this.stroke || this.strokeWidth === 0) {\n return;\n }\n\n var w = this.width / 2,\n h = this.height / 2;\n ctx.beginPath();\n ctx.moveTo(-w, -h);\n ctx.lineTo(w, -h);\n ctx.lineTo(w, h);\n ctx.lineTo(-w, h);\n ctx.lineTo(-w, -h);\n ctx.closePath();\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderDashedStroke: function (ctx) {\n var x = -this.width / 2,\n y = -this.height / 2,\n w = this.width,\n h = this.height;\n ctx.save();\n\n this._setStrokeStyles(ctx, this);\n\n ctx.beginPath();\n fabric.util.drawDashedLine(ctx, x, y, x + w, y, this.strokeDashArray);\n fabric.util.drawDashedLine(ctx, x + w, y, x + w, y + h, this.strokeDashArray);\n fabric.util.drawDashedLine(ctx, x + w, y + h, x, y + h, this.strokeDashArray);\n fabric.util.drawDashedLine(ctx, x, y + h, x, y, this.strokeDashArray);\n ctx.closePath();\n ctx.restore();\n },\n\n /**\n * Returns object representation of an instance\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} Object representation of an instance\n */\n toObject: function (propertiesToInclude) {\n var filters = [];\n this.filters.forEach(function (filterObj) {\n if (filterObj) {\n filters.push(filterObj.toObject());\n }\n });\n var object = extend(this.callSuper('toObject', ['cropX', 'cropY'].concat(propertiesToInclude)), {\n src: this.getSrc(),\n crossOrigin: this.getCrossOrigin(),\n filters: filters\n });\n\n if (this.resizeFilter) {\n object.resizeFilter = this.resizeFilter.toObject();\n }\n\n return object;\n },\n\n /**\n * Returns true if an image has crop applied, inspecting values of cropX,cropY,width,hight.\n * @return {Boolean}\n */\n hasCrop: function () {\n return this.cropX || this.cropY || this.width < this._element.width || this.height < this._element.height;\n },\n\n /* _TO_SVG_START_ */\n\n /**\n * Returns svg representation of an instance\n * @return {Array} an array of strings with the specific svg representation\n * of the instance\n */\n _toSVG: function () {\n var svgString = [],\n imageMarkup = [],\n strokeSvg,\n element = this._element,\n x = -this.width / 2,\n y = -this.height / 2,\n clipPath = '',\n imageRendering = '';\n\n if (!element) {\n return [];\n }\n\n if (this.hasCrop()) {\n var clipPathId = fabric.Object.__uid++;\n svgString.push('<clipPath id=\"imageCrop_' + clipPathId + '\">\\n', '\\t<rect x=\"' + x + '\" y=\"' + y + '\" width=\"' + this.width + '\" height=\"' + this.height + '\" />\\n', '</clipPath>\\n');\n clipPath = ' clip-path=\"url(#imageCrop_' + clipPathId + ')\" ';\n }\n\n if (!this.imageSmoothing) {\n imageRendering = '\" image-rendering=\"optimizeSpeed';\n }\n\n imageMarkup.push('\\t<image ', 'COMMON_PARTS', 'xlink:href=\"', this.getSvgSrc(true), '\" x=\"', x - this.cropX, '\" y=\"', y - this.cropY, // we're essentially moving origin of transformation from top/left corner to the center of the shape\n // by wrapping it in container <g> element with actual transformation, then offsetting object to the top/left\n // so that object's center aligns with container's left/top\n '\" width=\"', element.width || element.naturalWidth, '\" height=\"', element.height || element.height, imageRendering, '\"', clipPath, '></image>\\n');\n\n if (this.stroke || this.strokeDashArray) {\n var origFill = this.fill;\n this.fill = null;\n strokeSvg = ['\\t<rect ', 'x=\"', x, '\" y=\"', y, '\" width=\"', this.width, '\" height=\"', this.height, '\" style=\"', this.getSvgStyles(), '\"/>\\n'];\n this.fill = origFill;\n }\n\n if (this.paintFirst !== 'fill') {\n svgString = svgString.concat(strokeSvg, imageMarkup);\n } else {\n svgString = svgString.concat(imageMarkup, strokeSvg);\n }\n\n return svgString;\n },\n\n /* _TO_SVG_END_ */\n\n /**\n * Returns source of an image\n * @param {Boolean} filtered indicates if the src is needed for svg\n * @return {String} Source of an image\n */\n getSrc: function (filtered) {\n var element = filtered ? this._element : this._originalElement;\n\n if (element) {\n if (element.toDataURL) {\n return element.toDataURL();\n }\n\n if (this.srcFromAttribute) {\n return element.getAttribute('src');\n } else {\n return element.src;\n }\n } else {\n return this.src || '';\n }\n },\n\n /**\n * Sets source of an image\n * @param {String} src Source string (URL)\n * @param {Function} [callback] Callback is invoked when image has been loaded (and all filters have been applied)\n * @param {Object} [options] Options object\n * @param {String} [options.crossOrigin] crossOrigin value (one of \"\", \"anonymous\", \"use-credentials\")\n * @see https://developer.mozilla.org/en-US/docs/HTML/CORS_settings_attributes\n * @return {fabric.Image} thisArg\n * @chainable\n */\n setSrc: function (src, callback, options) {\n fabric.util.loadImage(src, function (img, isError) {\n this.setElement(img, options);\n\n this._setWidthHeight();\n\n callback && callback(this, isError);\n }, this, options && options.crossOrigin);\n return this;\n },\n\n /**\n * Returns string representation of an instance\n * @return {String} String representation of an instance\n */\n toString: function () {\n return '#<fabric.Image: { src: \"' + this.getSrc() + '\" }>';\n },\n applyResizeFilters: function () {\n var filter = this.resizeFilter,\n minimumScale = this.minimumScaleTrigger,\n objectScale = this.getTotalObjectScaling(),\n scaleX = objectScale.scaleX,\n scaleY = objectScale.scaleY,\n elementToFilter = this._filteredEl || this._originalElement;\n\n if (this.group) {\n this.set('dirty', true);\n }\n\n if (!filter || scaleX > minimumScale && scaleY > minimumScale) {\n this._element = elementToFilter;\n this._filterScalingX = 1;\n this._filterScalingY = 1;\n this._lastScaleX = scaleX;\n this._lastScaleY = scaleY;\n return;\n }\n\n if (!fabric.filterBackend) {\n fabric.filterBackend = fabric.initFilterBackend();\n }\n\n var canvasEl = fabric.util.createCanvasElement(),\n cacheKey = this._filteredEl ? this.cacheKey + '_filtered' : this.cacheKey,\n sourceWidth = elementToFilter.width,\n sourceHeight = elementToFilter.height;\n canvasEl.width = sourceWidth;\n canvasEl.height = sourceHeight;\n this._element = canvasEl;\n this._lastScaleX = filter.scaleX = scaleX;\n this._lastScaleY = filter.scaleY = scaleY;\n fabric.filterBackend.applyFilters([filter], elementToFilter, sourceWidth, sourceHeight, this._element, cacheKey);\n this._filterScalingX = canvasEl.width / this._originalElement.width;\n this._filterScalingY = canvasEl.height / this._originalElement.height;\n },\n\n /**\n * Applies filters assigned to this image (from \"filters\" array) or from filter param\n * @method applyFilters\n * @param {Array} filters to be applied\n * @param {Boolean} forResizing specify if the filter operation is a resize operation\n * @return {thisArg} return the fabric.Image object\n * @chainable\n */\n applyFilters: function (filters) {\n filters = filters || this.filters || [];\n filters = filters.filter(function (filter) {\n return filter && !filter.isNeutralState();\n });\n this.set('dirty', true); // needs to clear out or WEBGL will not resize correctly\n\n this.removeTexture(this.cacheKey + '_filtered');\n\n if (filters.length === 0) {\n this._element = this._originalElement;\n this._filteredEl = null;\n this._filterScalingX = 1;\n this._filterScalingY = 1;\n return this;\n }\n\n var imgElement = this._originalElement,\n sourceWidth = imgElement.naturalWidth || imgElement.width,\n sourceHeight = imgElement.naturalHeight || imgElement.height;\n\n if (this._element === this._originalElement) {\n // if the element is the same we need to create a new element\n var canvasEl = fabric.util.createCanvasElement();\n canvasEl.width = sourceWidth;\n canvasEl.height = sourceHeight;\n this._element = canvasEl;\n this._filteredEl = canvasEl;\n } else {\n // clear the existing element to get new filter data\n // also dereference the eventual resized _element\n this._element = this._filteredEl;\n\n this._filteredEl.getContext('2d').clearRect(0, 0, sourceWidth, sourceHeight); // we also need to resize again at next renderAll, so remove saved _lastScaleX/Y\n\n\n this._lastScaleX = 1;\n this._lastScaleY = 1;\n }\n\n if (!fabric.filterBackend) {\n fabric.filterBackend = fabric.initFilterBackend();\n }\n\n fabric.filterBackend.applyFilters(filters, this._originalElement, sourceWidth, sourceHeight, this._element, this.cacheKey);\n\n if (this._originalElement.width !== this._element.width || this._originalElement.height !== this._element.height) {\n this._filterScalingX = this._element.width / this._originalElement.width;\n this._filterScalingY = this._element.height / this._originalElement.height;\n }\n\n return this;\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _render: function (ctx) {\n fabric.util.setImageSmoothing(ctx, this.imageSmoothing);\n\n if (this.isMoving !== true && this.resizeFilter && this._needsResize()) {\n this.applyResizeFilters();\n }\n\n this._stroke(ctx);\n\n this._renderPaintInOrder(ctx);\n },\n\n /**\n * Paint the cached copy of the object on the target context.\n * it will set the imageSmoothing for the draw operation\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n drawCacheOnCanvas: function (ctx) {\n fabric.util.setImageSmoothing(ctx, this.imageSmoothing);\n fabric.Object.prototype.drawCacheOnCanvas.call(this, ctx);\n },\n\n /**\n * Decide if the object should cache or not. Create its own cache level\n * needsItsOwnCache should be used when the object drawing method requires\n * a cache step. None of the fabric classes requires it.\n * Generally you do not cache objects in groups because the group outside is cached.\n * This is the special image version where we would like to avoid caching where possible.\n * Essentially images do not benefit from caching. They may require caching, and in that\n * case we do it. Also caching an image usually ends in a loss of details.\n * A full performance audit should be done.\n * @return {Boolean}\n */\n shouldCache: function () {\n return this.needsItsOwnCache();\n },\n _renderFill: function (ctx) {\n var elementToDraw = this._element;\n\n if (!elementToDraw) {\n return;\n }\n\n var scaleX = this._filterScalingX,\n scaleY = this._filterScalingY,\n w = this.width,\n h = this.height,\n min = Math.min,\n max = Math.max,\n // crop values cannot be lesser than 0.\n cropX = max(this.cropX, 0),\n cropY = max(this.cropY, 0),\n elWidth = elementToDraw.naturalWidth || elementToDraw.width,\n elHeight = elementToDraw.naturalHeight || elementToDraw.height,\n sX = cropX * scaleX,\n sY = cropY * scaleY,\n // the width height cannot exceed element width/height, starting from the crop offset.\n sW = min(w * scaleX, elWidth - sX),\n sH = min(h * scaleY, elHeight - sY),\n x = -w / 2,\n y = -h / 2,\n maxDestW = min(w, elWidth / scaleX - cropX),\n maxDestH = min(h, elHeight / scaleX - cropY);\n elementToDraw && ctx.drawImage(elementToDraw, sX, sY, sW, sH, x, y, maxDestW, maxDestH);\n },\n\n /**\n * needed to check if image needs resize\n * @private\n */\n _needsResize: function () {\n var scale = this.getTotalObjectScaling();\n return scale.scaleX !== this._lastScaleX || scale.scaleY !== this._lastScaleY;\n },\n\n /**\n * @private\n */\n _resetWidthHeight: function () {\n this.set(this.getOriginalSize());\n },\n\n /**\n * The Image class's initialization method. This method is automatically\n * called by the constructor.\n * @private\n * @param {HTMLImageElement|String} element The element representing the image\n * @param {Object} [options] Options object\n */\n _initElement: function (element, options) {\n this.setElement(fabric.util.getById(element), options);\n fabric.util.addClass(this.getElement(), fabric.Image.CSS_CANVAS);\n },\n\n /**\n * @private\n * @param {Object} [options] Options object\n */\n _initConfig: function (options) {\n options || (options = {});\n this.setOptions(options);\n\n this._setWidthHeight(options);\n },\n\n /**\n * @private\n * @param {Array} filters to be initialized\n * @param {Function} callback Callback to invoke when all fabric.Image.filters instances are created\n */\n _initFilters: function (filters, callback) {\n if (filters && filters.length) {\n fabric.util.enlivenObjects(filters, function (enlivenedObjects) {\n callback && callback(enlivenedObjects);\n }, 'fabric.Image.filters');\n } else {\n callback && callback();\n }\n },\n\n /**\n * @private\n * Set the width and the height of the image object, using the element or the\n * options.\n * @param {Object} [options] Object with width/height properties\n */\n _setWidthHeight: function (options) {\n options || (options = {});\n var el = this.getElement();\n this.width = options.width || el.naturalWidth || el.width || 0;\n this.height = options.height || el.naturalHeight || el.height || 0;\n },\n\n /**\n * Calculate offset for center and scale factor for the image in order to respect\n * the preserveAspectRatio attribute\n * @private\n * @return {Object}\n */\n parsePreserveAspectRatioAttribute: function () {\n var pAR = fabric.util.parsePreserveAspectRatioAttribute(this.preserveAspectRatio || ''),\n rWidth = this._element.width,\n rHeight = this._element.height,\n scaleX = 1,\n scaleY = 1,\n offsetLeft = 0,\n offsetTop = 0,\n cropX = 0,\n cropY = 0,\n offset,\n pWidth = this.width,\n pHeight = this.height,\n parsedAttributes = {\n width: pWidth,\n height: pHeight\n };\n\n if (pAR && (pAR.alignX !== 'none' || pAR.alignY !== 'none')) {\n if (pAR.meetOrSlice === 'meet') {\n scaleX = scaleY = fabric.util.findScaleToFit(this._element, parsedAttributes);\n offset = (pWidth - rWidth * scaleX) / 2;\n\n if (pAR.alignX === 'Min') {\n offsetLeft = -offset;\n }\n\n if (pAR.alignX === 'Max') {\n offsetLeft = offset;\n }\n\n offset = (pHeight - rHeight * scaleY) / 2;\n\n if (pAR.alignY === 'Min') {\n offsetTop = -offset;\n }\n\n if (pAR.alignY === 'Max') {\n offsetTop = offset;\n }\n }\n\n if (pAR.meetOrSlice === 'slice') {\n scaleX = scaleY = fabric.util.findScaleToCover(this._element, parsedAttributes);\n offset = rWidth - pWidth / scaleX;\n\n if (pAR.alignX === 'Mid') {\n cropX = offset / 2;\n }\n\n if (pAR.alignX === 'Max') {\n cropX = offset;\n }\n\n offset = rHeight - pHeight / scaleY;\n\n if (pAR.alignY === 'Mid') {\n cropY = offset / 2;\n }\n\n if (pAR.alignY === 'Max') {\n cropY = offset;\n }\n\n rWidth = pWidth / scaleX;\n rHeight = pHeight / scaleY;\n }\n } else {\n scaleX = pWidth / rWidth;\n scaleY = pHeight / rHeight;\n }\n\n return {\n width: rWidth,\n height: rHeight,\n scaleX: scaleX,\n scaleY: scaleY,\n offsetLeft: offsetLeft,\n offsetTop: offsetTop,\n cropX: cropX,\n cropY: cropY\n };\n }\n });\n /**\n * Default CSS class name for canvas\n * @static\n * @type String\n * @default\n */\n\n fabric.Image.CSS_CANVAS = 'canvas-img';\n /**\n * Alias for getSrc\n * @static\n */\n\n fabric.Image.prototype.getSvgSrc = fabric.Image.prototype.getSrc;\n /**\n * Creates an instance of fabric.Image from its object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {Function} callback Callback to invoke when an image instance is created\n */\n\n fabric.Image.fromObject = function (_object, callback) {\n var object = fabric.util.object.clone(_object);\n fabric.util.loadImage(object.src, function (img, isError) {\n if (isError) {\n callback && callback(null, true);\n return;\n }\n\n fabric.Image.prototype._initFilters.call(object, object.filters, function (filters) {\n object.filters = filters || [];\n\n fabric.Image.prototype._initFilters.call(object, [object.resizeFilter], function (resizeFilters) {\n object.resizeFilter = resizeFilters[0];\n fabric.util.enlivenObjects([object.clipPath], function (enlivedProps) {\n object.clipPath = enlivedProps[0];\n var image = new fabric.Image(img, object);\n callback(image, false);\n });\n });\n });\n }, null, object.crossOrigin);\n };\n /**\n * Creates an instance of fabric.Image from an URL string\n * @static\n * @param {String} url URL to create an image from\n * @param {Function} [callback] Callback to invoke when image is created (newly created image is passed as a first argument). Second argument is a boolean indicating if an error occured or not.\n * @param {Object} [imgOptions] Options object\n */\n\n\n fabric.Image.fromURL = function (url, callback, imgOptions) {\n fabric.util.loadImage(url, function (img, isError) {\n callback && callback(new fabric.Image(img, imgOptions), isError);\n }, null, imgOptions && imgOptions.crossOrigin);\n };\n /* _FROM_SVG_START_ */\n\n /**\n * List of attribute names to account for when parsing SVG element (used by {@link fabric.Image.fromElement})\n * @static\n * @see {@link http://www.w3.org/TR/SVG/struct.html#ImageElement}\n */\n\n\n fabric.Image.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat('x y width height preserveAspectRatio xlink:href crossOrigin image-rendering'.split(' '));\n /**\n * Returns {@link fabric.Image} instance from an SVG element\n * @static\n * @param {SVGElement} element Element to parse\n * @param {Object} [options] Options object\n * @param {Function} callback Callback to execute when fabric.Image object is created\n * @return {fabric.Image} Instance of fabric.Image\n */\n\n fabric.Image.fromElement = function (element, callback, options) {\n var parsedAttributes = fabric.parseAttributes(element, fabric.Image.ATTRIBUTE_NAMES);\n fabric.Image.fromURL(parsedAttributes['xlink:href'], callback, extend(options ? fabric.util.object.clone(options) : {}, parsedAttributes));\n };\n /* _FROM_SVG_END_ */\n\n})(typeof exports !== 'undefined' ? exports : this);\n\nfabric.util.object.extend(fabric.Object.prototype,\n/** @lends fabric.Object.prototype */\n{\n /**\n * @private\n * @return {Number} angle value\n */\n _getAngleValueForStraighten: function () {\n var angle = this.angle % 360;\n\n if (angle > 0) {\n return Math.round((angle - 1) / 90) * 90;\n }\n\n return Math.round(angle / 90) * 90;\n },\n\n /**\n * Straightens an object (rotating it from current angle to one of 0, 90, 180, 270, etc. depending on which is closer)\n * @return {fabric.Object} thisArg\n * @chainable\n */\n straighten: function () {\n this.rotate(this._getAngleValueForStraighten());\n return this;\n },\n\n /**\n * Same as {@link fabric.Object.prototype.straighten} but with animation\n * @param {Object} callbacks Object with callback functions\n * @param {Function} [callbacks.onComplete] Invoked on completion\n * @param {Function} [callbacks.onChange] Invoked on every step of animation\n * @return {fabric.Object} thisArg\n * @chainable\n */\n fxStraighten: function (callbacks) {\n callbacks = callbacks || {};\n\n var empty = function () {},\n onComplete = callbacks.onComplete || empty,\n onChange = callbacks.onChange || empty,\n _this = this;\n\n fabric.util.animate({\n startValue: this.get('angle'),\n endValue: this._getAngleValueForStraighten(),\n duration: this.FX_DURATION,\n onChange: function (value) {\n _this.rotate(value);\n\n onChange();\n },\n onComplete: function () {\n _this.setCoords();\n\n onComplete();\n }\n });\n return this;\n }\n});\nfabric.util.object.extend(fabric.StaticCanvas.prototype,\n/** @lends fabric.StaticCanvas.prototype */\n{\n /**\n * Straightens object, then rerenders canvas\n * @param {fabric.Object} object Object to straighten\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n straightenObject: function (object) {\n object.straighten();\n this.requestRenderAll();\n return this;\n },\n\n /**\n * Same as {@link fabric.Canvas.prototype.straightenObject}, but animated\n * @param {fabric.Object} object Object to straighten\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n fxStraightenObject: function (object) {\n object.fxStraighten({\n onChange: this.requestRenderAllBound\n });\n return this;\n }\n});\n\n(function () {\n 'use strict';\n /**\n * Tests if webgl supports certain precision\n * @param {WebGL} Canvas WebGL context to test on\n * @param {String} Precision to test can be any of following: 'lowp', 'mediump', 'highp'\n * @returns {Boolean} Whether the user's browser WebGL supports given precision.\n */\n\n function testPrecision(gl, precision) {\n var fragmentSource = 'precision ' + precision + ' float;\\nvoid main(){}';\n var fragmentShader = gl.createShader(gl.FRAGMENT_SHADER);\n gl.shaderSource(fragmentShader, fragmentSource);\n gl.compileShader(fragmentShader);\n\n if (!gl.getShaderParameter(fragmentShader, gl.COMPILE_STATUS)) {\n return false;\n }\n\n return true;\n }\n /**\n * Indicate whether this filtering backend is supported by the user's browser.\n * @param {Number} tileSize check if the tileSize is supported\n * @returns {Boolean} Whether the user's browser supports WebGL.\n */\n\n\n fabric.isWebglSupported = function (tileSize) {\n if (fabric.isLikelyNode) {\n return false;\n }\n\n tileSize = tileSize || fabric.WebglFilterBackend.prototype.tileSize;\n var canvas = document.createElement('canvas');\n var gl = canvas.getContext('webgl') || canvas.getContext('experimental-webgl');\n var isSupported = false; // eslint-disable-next-line\n\n if (gl) {\n fabric.maxTextureSize = gl.getParameter(gl.MAX_TEXTURE_SIZE);\n isSupported = fabric.maxTextureSize >= tileSize;\n var precisions = ['highp', 'mediump', 'lowp'];\n\n for (var i = 0; i < 3; i++) {\n if (testPrecision(gl, precisions[i])) {\n fabric.webGlPrecision = precisions[i];\n break;\n }\n\n ;\n }\n }\n\n this.isSupported = isSupported;\n return isSupported;\n };\n\n fabric.WebglFilterBackend = WebglFilterBackend;\n /**\n * WebGL filter backend.\n */\n\n function WebglFilterBackend(options) {\n if (options && options.tileSize) {\n this.tileSize = options.tileSize;\n }\n\n this.setupGLContext(this.tileSize, this.tileSize);\n this.captureGPUInfo();\n }\n\n ;\n WebglFilterBackend.prototype =\n /** @lends fabric.WebglFilterBackend.prototype */\n {\n tileSize: 2048,\n\n /**\n * Experimental. This object is a sort of repository of help layers used to avoid\n * of recreating them during frequent filtering. If you are previewing a filter with\n * a slider you problably do not want to create help layers every filter step.\n * in this object there will be appended some canvases, created once, resized sometimes\n * cleared never. Clearing is left to the developer.\n **/\n resources: {},\n\n /**\n * Setup a WebGL context suitable for filtering, and bind any needed event handlers.\n */\n setupGLContext: function (width, height) {\n this.dispose();\n this.createWebGLCanvas(width, height); // eslint-disable-next-line\n\n this.aPosition = new Float32Array([0, 0, 0, 1, 1, 0, 1, 1]);\n this.chooseFastestCopyGLTo2DMethod(width, height);\n },\n\n /**\n * Pick a method to copy data from GL context to 2d canvas. In some browsers using\n * putImageData is faster than drawImage for that specific operation.\n */\n chooseFastestCopyGLTo2DMethod: function (width, height) {\n var canMeasurePerf = typeof window.performance !== 'undefined',\n canUseImageData;\n\n try {\n new ImageData(1, 1);\n canUseImageData = true;\n } catch (e) {\n canUseImageData = false;\n } // eslint-disable-next-line no-undef\n\n\n var canUseArrayBuffer = typeof ArrayBuffer !== 'undefined'; // eslint-disable-next-line no-undef\n\n var canUseUint8Clamped = typeof Uint8ClampedArray !== 'undefined';\n\n if (!(canMeasurePerf && canUseImageData && canUseArrayBuffer && canUseUint8Clamped)) {\n return;\n }\n\n var targetCanvas = fabric.util.createCanvasElement(); // eslint-disable-next-line no-undef\n\n var imageBuffer = new ArrayBuffer(width * height * 4);\n\n if (fabric.forceGLPutImageData) {\n this.imageBuffer = imageBuffer;\n this.copyGLTo2D = copyGLTo2DPutImageData;\n return;\n }\n\n var testContext = {\n imageBuffer: imageBuffer,\n destinationWidth: width,\n destinationHeight: height,\n targetCanvas: targetCanvas\n };\n var startTime, drawImageTime, putImageDataTime;\n targetCanvas.width = width;\n targetCanvas.height = height;\n startTime = window.performance.now();\n copyGLTo2DDrawImage.call(testContext, this.gl, testContext);\n drawImageTime = window.performance.now() - startTime;\n startTime = window.performance.now();\n copyGLTo2DPutImageData.call(testContext, this.gl, testContext);\n putImageDataTime = window.performance.now() - startTime;\n\n if (drawImageTime > putImageDataTime) {\n this.imageBuffer = imageBuffer;\n this.copyGLTo2D = copyGLTo2DPutImageData;\n } else {\n this.copyGLTo2D = copyGLTo2DDrawImage;\n }\n },\n\n /**\n * Create a canvas element and associated WebGL context and attaches them as\n * class properties to the GLFilterBackend class.\n */\n createWebGLCanvas: function (width, height) {\n var canvas = fabric.util.createCanvasElement();\n canvas.width = width;\n canvas.height = height;\n var glOptions = {\n alpha: true,\n premultipliedAlpha: false,\n depth: false,\n stencil: false,\n antialias: false\n },\n gl = canvas.getContext('webgl', glOptions);\n\n if (!gl) {\n gl = canvas.getContext('experimental-webgl', glOptions);\n }\n\n if (!gl) {\n return;\n }\n\n gl.clearColor(0, 0, 0, 0); // this canvas can fire webglcontextlost and webglcontextrestored\n\n this.canvas = canvas;\n this.gl = gl;\n },\n\n /**\n * Attempts to apply the requested filters to the source provided, drawing the filtered output\n * to the provided target canvas.\n *\n * @param {Array} filters The filters to apply.\n * @param {HTMLImageElement|HTMLCanvasElement} source The source to be filtered.\n * @param {Number} width The width of the source input.\n * @param {Number} height The height of the source input.\n * @param {HTMLCanvasElement} targetCanvas The destination for filtered output to be drawn.\n * @param {String|undefined} cacheKey A key used to cache resources related to the source. If\n * omitted, caching will be skipped.\n */\n applyFilters: function (filters, source, width, height, targetCanvas, cacheKey) {\n var gl = this.gl;\n var cachedTexture;\n\n if (cacheKey) {\n cachedTexture = this.getCachedTexture(cacheKey, source);\n }\n\n var pipelineState = {\n originalWidth: source.width || source.originalWidth,\n originalHeight: source.height || source.originalHeight,\n sourceWidth: width,\n sourceHeight: height,\n destinationWidth: width,\n destinationHeight: height,\n context: gl,\n sourceTexture: this.createTexture(gl, width, height, !cachedTexture && source),\n targetTexture: this.createTexture(gl, width, height),\n originalTexture: cachedTexture || this.createTexture(gl, width, height, !cachedTexture && source),\n passes: filters.length,\n webgl: true,\n aPosition: this.aPosition,\n programCache: this.programCache,\n pass: 0,\n filterBackend: this,\n targetCanvas: targetCanvas\n };\n var tempFbo = gl.createFramebuffer();\n gl.bindFramebuffer(gl.FRAMEBUFFER, tempFbo);\n filters.forEach(function (filter) {\n filter && filter.applyTo(pipelineState);\n });\n resizeCanvasIfNeeded(pipelineState);\n this.copyGLTo2D(gl, pipelineState);\n gl.bindTexture(gl.TEXTURE_2D, null);\n gl.deleteTexture(pipelineState.sourceTexture);\n gl.deleteTexture(pipelineState.targetTexture);\n gl.deleteFramebuffer(tempFbo);\n targetCanvas.getContext('2d').setTransform(1, 0, 0, 1, 0, 0);\n return pipelineState;\n },\n\n /**\n * Detach event listeners, remove references, and clean up caches.\n */\n dispose: function () {\n if (this.canvas) {\n this.canvas = null;\n this.gl = null;\n }\n\n this.clearWebGLCaches();\n },\n\n /**\n * Wipe out WebGL-related caches.\n */\n clearWebGLCaches: function () {\n this.programCache = {};\n this.textureCache = {};\n },\n\n /**\n * Create a WebGL texture object.\n *\n * Accepts specific dimensions to initialize the textuer to or a source image.\n *\n * @param {WebGLRenderingContext} gl The GL context to use for creating the texture.\n * @param {Number} width The width to initialize the texture at.\n * @param {Number} height The height to initialize the texture.\n * @param {HTMLImageElement|HTMLCanvasElement} textureImageSource A source for the texture data.\n * @returns {WebGLTexture}\n */\n createTexture: function (gl, width, height, textureImageSource) {\n var texture = gl.createTexture();\n gl.bindTexture(gl.TEXTURE_2D, texture);\n gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);\n gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);\n gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);\n gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);\n\n if (textureImageSource) {\n gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, textureImageSource);\n } else {\n gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);\n }\n\n return texture;\n },\n\n /**\n * Can be optionally used to get a texture from the cache array\n *\n * If an existing texture is not found, a new texture is created and cached.\n *\n * @param {String} uniqueId A cache key to use to find an existing texture.\n * @param {HTMLImageElement|HTMLCanvasElement} textureImageSource A source to use to create the\n * texture cache entry if one does not already exist.\n */\n getCachedTexture: function (uniqueId, textureImageSource) {\n if (this.textureCache[uniqueId]) {\n return this.textureCache[uniqueId];\n } else {\n var texture = this.createTexture(this.gl, textureImageSource.width, textureImageSource.height, textureImageSource);\n this.textureCache[uniqueId] = texture;\n return texture;\n }\n },\n\n /**\n * Clear out cached resources related to a source image that has been\n * filtered previously.\n *\n * @param {String} cacheKey The cache key provided when the source image was filtered.\n */\n evictCachesForKey: function (cacheKey) {\n if (this.textureCache[cacheKey]) {\n this.gl.deleteTexture(this.textureCache[cacheKey]);\n delete this.textureCache[cacheKey];\n }\n },\n copyGLTo2D: copyGLTo2DDrawImage,\n\n /**\n * Attempt to extract GPU information strings from a WebGL context.\n *\n * Useful information when debugging or blacklisting specific GPUs.\n *\n * @returns {Object} A GPU info object with renderer and vendor strings.\n */\n captureGPUInfo: function () {\n if (this.gpuInfo) {\n return this.gpuInfo;\n }\n\n var gl = this.gl,\n gpuInfo = {\n renderer: '',\n vendor: ''\n };\n\n if (!gl) {\n return gpuInfo;\n }\n\n var ext = gl.getExtension('WEBGL_debug_renderer_info');\n\n if (ext) {\n var renderer = gl.getParameter(ext.UNMASKED_RENDERER_WEBGL);\n var vendor = gl.getParameter(ext.UNMASKED_VENDOR_WEBGL);\n\n if (renderer) {\n gpuInfo.renderer = renderer.toLowerCase();\n }\n\n if (vendor) {\n gpuInfo.vendor = vendor.toLowerCase();\n }\n }\n\n this.gpuInfo = gpuInfo;\n return gpuInfo;\n }\n };\n})();\n\nfunction resizeCanvasIfNeeded(pipelineState) {\n var targetCanvas = pipelineState.targetCanvas,\n width = targetCanvas.width,\n height = targetCanvas.height,\n dWidth = pipelineState.destinationWidth,\n dHeight = pipelineState.destinationHeight;\n\n if (width !== dWidth || height !== dHeight) {\n targetCanvas.width = dWidth;\n targetCanvas.height = dHeight;\n }\n}\n/**\n * Copy an input WebGL canvas on to an output 2D canvas.\n *\n * The WebGL canvas is assumed to be upside down, with the top-left pixel of the\n * desired output image appearing in the bottom-left corner of the WebGL canvas.\n *\n * @param {WebGLRenderingContext} sourceContext The WebGL context to copy from.\n * @param {HTMLCanvasElement} targetCanvas The 2D target canvas to copy on to.\n * @param {Object} pipelineState The 2D target canvas to copy on to.\n */\n\n\nfunction copyGLTo2DDrawImage(gl, pipelineState) {\n var glCanvas = gl.canvas,\n targetCanvas = pipelineState.targetCanvas,\n ctx = targetCanvas.getContext('2d');\n ctx.translate(0, targetCanvas.height); // move it down again\n\n ctx.scale(1, -1); // vertical flip\n // where is my image on the big glcanvas?\n\n var sourceY = glCanvas.height - targetCanvas.height;\n ctx.drawImage(glCanvas, 0, sourceY, targetCanvas.width, targetCanvas.height, 0, 0, targetCanvas.width, targetCanvas.height);\n}\n/**\n * Copy an input WebGL canvas on to an output 2D canvas using 2d canvas' putImageData\n * API. Measurably faster than using ctx.drawImage in Firefox (version 54 on OSX Sierra).\n *\n * @param {WebGLRenderingContext} sourceContext The WebGL context to copy from.\n * @param {HTMLCanvasElement} targetCanvas The 2D target canvas to copy on to.\n * @param {Object} pipelineState The 2D target canvas to copy on to.\n */\n\n\nfunction copyGLTo2DPutImageData(gl, pipelineState) {\n var targetCanvas = pipelineState.targetCanvas,\n ctx = targetCanvas.getContext('2d'),\n dWidth = pipelineState.destinationWidth,\n dHeight = pipelineState.destinationHeight,\n numBytes = dWidth * dHeight * 4; // eslint-disable-next-line no-undef\n\n var u8 = new Uint8Array(this.imageBuffer, 0, numBytes); // eslint-disable-next-line no-undef\n\n var u8Clamped = new Uint8ClampedArray(this.imageBuffer, 0, numBytes);\n gl.readPixels(0, 0, dWidth, dHeight, gl.RGBA, gl.UNSIGNED_BYTE, u8);\n var imgData = new ImageData(u8Clamped, dWidth, dHeight);\n ctx.putImageData(imgData, 0, 0);\n}\n\n(function () {\n 'use strict';\n\n var noop = function () {};\n\n fabric.Canvas2dFilterBackend = Canvas2dFilterBackend;\n /**\n * Canvas 2D filter backend.\n */\n\n function Canvas2dFilterBackend() {}\n\n ;\n Canvas2dFilterBackend.prototype =\n /** @lends fabric.Canvas2dFilterBackend.prototype */\n {\n evictCachesForKey: noop,\n dispose: noop,\n clearWebGLCaches: noop,\n\n /**\n * Experimental. This object is a sort of repository of help layers used to avoid\n * of recreating them during frequent filtering. If you are previewing a filter with\n * a slider you probably do not want to create help layers every filter step.\n * in this object there will be appended some canvases, created once, resized sometimes\n * cleared never. Clearing is left to the developer.\n **/\n resources: {},\n\n /**\n * Apply a set of filters against a source image and draw the filtered output\n * to the provided destination canvas.\n *\n * @param {EnhancedFilter} filters The filter to apply.\n * @param {HTMLImageElement|HTMLCanvasElement} sourceElement The source to be filtered.\n * @param {Number} sourceWidth The width of the source input.\n * @param {Number} sourceHeight The height of the source input.\n * @param {HTMLCanvasElement} targetCanvas The destination for filtered output to be drawn.\n */\n applyFilters: function (filters, sourceElement, sourceWidth, sourceHeight, targetCanvas) {\n var ctx = targetCanvas.getContext('2d');\n ctx.drawImage(sourceElement, 0, 0, sourceWidth, sourceHeight);\n var imageData = ctx.getImageData(0, 0, sourceWidth, sourceHeight);\n var originalImageData = ctx.getImageData(0, 0, sourceWidth, sourceHeight);\n var pipelineState = {\n sourceWidth: sourceWidth,\n sourceHeight: sourceHeight,\n imageData: imageData,\n originalEl: sourceElement,\n originalImageData: originalImageData,\n canvasEl: targetCanvas,\n ctx: ctx,\n filterBackend: this\n };\n filters.forEach(function (filter) {\n filter.applyTo(pipelineState);\n });\n\n if (pipelineState.imageData.width !== sourceWidth || pipelineState.imageData.height !== sourceHeight) {\n targetCanvas.width = pipelineState.imageData.width;\n targetCanvas.height = pipelineState.imageData.height;\n }\n\n ctx.putImageData(pipelineState.imageData, 0, 0);\n return pipelineState;\n }\n };\n})();\n/**\n * @namespace fabric.Image.filters\n * @memberOf fabric.Image\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-2#image_filters}\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n */\n\n\nfabric.Image = fabric.Image || {};\nfabric.Image.filters = fabric.Image.filters || {};\n/**\n * Root filter class from which all filter classes inherit from\n * @class fabric.Image.filters.BaseFilter\n * @memberOf fabric.Image.filters\n */\n\nfabric.Image.filters.BaseFilter = fabric.util.createClass(\n/** @lends fabric.Image.filters.BaseFilter.prototype */\n{\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'BaseFilter',\n\n /**\n * Array of attributes to send with buffers. do not modify\n * @private\n */\n vertexSource: 'attribute vec2 aPosition;\\n' + 'varying vec2 vTexCoord;\\n' + 'void main() {\\n' + 'vTexCoord = aPosition;\\n' + 'gl_Position = vec4(aPosition * 2.0 - 1.0, 0.0, 1.0);\\n' + '}',\n fragmentSource: 'precision highp float;\\n' + 'varying vec2 vTexCoord;\\n' + 'uniform sampler2D uTexture;\\n' + 'void main() {\\n' + 'gl_FragColor = texture2D(uTexture, vTexCoord);\\n' + '}',\n\n /**\n * Constructor\n * @param {Object} [options] Options object\n */\n initialize: function (options) {\n if (options) {\n this.setOptions(options);\n }\n },\n\n /**\n * Sets filter's properties from options\n * @param {Object} [options] Options object\n */\n setOptions: function (options) {\n for (var prop in options) {\n this[prop] = options[prop];\n }\n },\n\n /**\n * Compile this filter's shader program.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context to use for shader compilation.\n * @param {String} fragmentSource fragmentShader source for compilation\n * @param {String} vertexSource vertexShader source for compilation\n */\n createProgram: function (gl, fragmentSource, vertexSource) {\n fragmentSource = fragmentSource || this.fragmentSource;\n vertexSource = vertexSource || this.vertexSource;\n\n if (fabric.webGlPrecision !== 'highp') {\n fragmentSource = fragmentSource.replace(/precision highp float/g, 'precision ' + fabric.webGlPrecision + ' float');\n }\n\n var vertexShader = gl.createShader(gl.VERTEX_SHADER);\n gl.shaderSource(vertexShader, vertexSource);\n gl.compileShader(vertexShader);\n\n if (!gl.getShaderParameter(vertexShader, gl.COMPILE_STATUS)) {\n throw new Error( // eslint-disable-next-line prefer-template\n 'Vertex shader compile error for ' + this.type + ': ' + gl.getShaderInfoLog(vertexShader));\n }\n\n var fragmentShader = gl.createShader(gl.FRAGMENT_SHADER);\n gl.shaderSource(fragmentShader, fragmentSource);\n gl.compileShader(fragmentShader);\n\n if (!gl.getShaderParameter(fragmentShader, gl.COMPILE_STATUS)) {\n throw new Error( // eslint-disable-next-line prefer-template\n 'Fragment shader compile error for ' + this.type + ': ' + gl.getShaderInfoLog(fragmentShader));\n }\n\n var program = gl.createProgram();\n gl.attachShader(program, vertexShader);\n gl.attachShader(program, fragmentShader);\n gl.linkProgram(program);\n\n if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {\n throw new Error( // eslint-disable-next-line prefer-template\n 'Shader link error for \"${this.type}\" ' + gl.getProgramInfoLog(program));\n }\n\n var attributeLocations = this.getAttributeLocations(gl, program);\n var uniformLocations = this.getUniformLocations(gl, program) || {};\n uniformLocations.uStepW = gl.getUniformLocation(program, 'uStepW');\n uniformLocations.uStepH = gl.getUniformLocation(program, 'uStepH');\n return {\n program: program,\n attributeLocations: attributeLocations,\n uniformLocations: uniformLocations\n };\n },\n\n /**\n * Return a map of attribute names to WebGLAttributeLocation objects.\n *\n * @param {WebGLRenderingContext} gl The canvas context used to compile the shader program.\n * @param {WebGLShaderProgram} program The shader program from which to take attribute locations.\n * @returns {Object} A map of attribute names to attribute locations.\n */\n getAttributeLocations: function (gl, program) {\n return {\n aPosition: gl.getAttribLocation(program, 'aPosition')\n };\n },\n\n /**\n * Return a map of uniform names to WebGLUniformLocation objects.\n *\n * Intended to be overridden by subclasses.\n *\n * @param {WebGLRenderingContext} gl The canvas context used to compile the shader program.\n * @param {WebGLShaderProgram} program The shader program from which to take uniform locations.\n * @returns {Object} A map of uniform names to uniform locations.\n */\n getUniformLocations: function ()\n /* gl, program */\n {\n // in case i do not need any special uniform i need to return an empty object\n return {};\n },\n\n /**\n * Send attribute data from this filter to its shader program on the GPU.\n *\n * @param {WebGLRenderingContext} gl The canvas context used to compile the shader program.\n * @param {Object} attributeLocations A map of shader attribute names to their locations.\n */\n sendAttributeData: function (gl, attributeLocations, aPositionData) {\n var attributeLocation = attributeLocations.aPosition;\n var buffer = gl.createBuffer();\n gl.bindBuffer(gl.ARRAY_BUFFER, buffer);\n gl.enableVertexAttribArray(attributeLocation);\n gl.vertexAttribPointer(attributeLocation, 2, gl.FLOAT, false, 0, 0);\n gl.bufferData(gl.ARRAY_BUFFER, aPositionData, gl.STATIC_DRAW);\n },\n _setupFrameBuffer: function (options) {\n var gl = options.context,\n width,\n height;\n\n if (options.passes > 1) {\n width = options.destinationWidth;\n height = options.destinationHeight;\n\n if (options.sourceWidth !== width || options.sourceHeight !== height) {\n gl.deleteTexture(options.targetTexture);\n options.targetTexture = options.filterBackend.createTexture(gl, width, height);\n }\n\n gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D, options.targetTexture, 0);\n } else {\n // draw last filter on canvas and not to framebuffer.\n gl.bindFramebuffer(gl.FRAMEBUFFER, null);\n gl.finish();\n }\n },\n _swapTextures: function (options) {\n options.passes--;\n options.pass++;\n var temp = options.targetTexture;\n options.targetTexture = options.sourceTexture;\n options.sourceTexture = temp;\n },\n\n /**\n * Generic isNeutral implementation for one parameter based filters.\n * Used only in image applyFilters to discard filters that will not have an effect\n * on the image\n * Other filters may need their own verison ( ColorMatrix, HueRotation, gamma, ComposedFilter )\n * @param {Object} options\n **/\n isNeutralState: function ()\n /* options */\n {\n var main = this.mainParameter,\n _class = fabric.Image.filters[this.type].prototype;\n\n if (main) {\n if (Array.isArray(_class[main])) {\n for (var i = _class[main].length; i--;) {\n if (this[main][i] !== _class[main][i]) {\n return false;\n }\n }\n\n return true;\n } else {\n return _class[main] === this[main];\n }\n } else {\n return false;\n }\n },\n\n /**\n * Apply this filter to the input image data provided.\n *\n * Determines whether to use WebGL or Canvas2D based on the options.webgl flag.\n *\n * @param {Object} options\n * @param {Number} options.passes The number of filters remaining to be executed\n * @param {Boolean} options.webgl Whether to use webgl to render the filter.\n * @param {WebGLTexture} options.sourceTexture The texture setup as the source to be filtered.\n * @param {WebGLTexture} options.targetTexture The texture where filtered output should be drawn.\n * @param {WebGLRenderingContext} options.context The GL context used for rendering.\n * @param {Object} options.programCache A map of compiled shader programs, keyed by filter type.\n */\n applyTo: function (options) {\n if (options.webgl) {\n this._setupFrameBuffer(options);\n\n this.applyToWebGL(options);\n\n this._swapTextures(options);\n } else {\n this.applyTo2d(options);\n }\n },\n\n /**\n * Retrieves the cached shader.\n * @param {Object} options\n * @param {WebGLRenderingContext} options.context The GL context used for rendering.\n * @param {Object} options.programCache A map of compiled shader programs, keyed by filter type.\n */\n retrieveShader: function (options) {\n if (!options.programCache.hasOwnProperty(this.type)) {\n options.programCache[this.type] = this.createProgram(options.context);\n }\n\n return options.programCache[this.type];\n },\n\n /**\n * Apply this filter using webgl.\n *\n * @param {Object} options\n * @param {Number} options.passes The number of filters remaining to be executed\n * @param {Boolean} options.webgl Whether to use webgl to render the filter.\n * @param {WebGLTexture} options.originalTexture The texture of the original input image.\n * @param {WebGLTexture} options.sourceTexture The texture setup as the source to be filtered.\n * @param {WebGLTexture} options.targetTexture The texture where filtered output should be drawn.\n * @param {WebGLRenderingContext} options.context The GL context used for rendering.\n * @param {Object} options.programCache A map of compiled shader programs, keyed by filter type.\n */\n applyToWebGL: function (options) {\n var gl = options.context;\n var shader = this.retrieveShader(options);\n\n if (options.pass === 0 && options.originalTexture) {\n gl.bindTexture(gl.TEXTURE_2D, options.originalTexture);\n } else {\n gl.bindTexture(gl.TEXTURE_2D, options.sourceTexture);\n }\n\n gl.useProgram(shader.program);\n this.sendAttributeData(gl, shader.attributeLocations, options.aPosition);\n gl.uniform1f(shader.uniformLocations.uStepW, 1 / options.sourceWidth);\n gl.uniform1f(shader.uniformLocations.uStepH, 1 / options.sourceHeight);\n this.sendUniformData(gl, shader.uniformLocations);\n gl.viewport(0, 0, options.destinationWidth, options.destinationHeight);\n gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);\n },\n bindAdditionalTexture: function (gl, texture, textureUnit) {\n gl.activeTexture(textureUnit);\n gl.bindTexture(gl.TEXTURE_2D, texture); // reset active texture to 0 as usual\n\n gl.activeTexture(gl.TEXTURE0);\n },\n unbindAdditionalTexture: function (gl, textureUnit) {\n gl.activeTexture(textureUnit);\n gl.bindTexture(gl.TEXTURE_2D, null);\n gl.activeTexture(gl.TEXTURE0);\n },\n getMainParameter: function () {\n return this[this.mainParameter];\n },\n setMainParameter: function (value) {\n this[this.mainParameter] = value;\n },\n\n /**\n * Send uniform data from this filter to its shader program on the GPU.\n *\n * Intended to be overridden by subclasses.\n *\n * @param {WebGLRenderingContext} gl The canvas context used to compile the shader program.\n * @param {Object} uniformLocations A map of shader uniform names to their locations.\n */\n sendUniformData: function ()\n /* gl, uniformLocations */\n {// Intentionally left blank. Override me in subclasses.\n },\n\n /**\n * If needed by a 2d filter, this functions can create an helper canvas to be used\n * remember that options.targetCanvas is available for use till end of chain.\n */\n createHelpLayer: function (options) {\n if (!options.helpLayer) {\n var helpLayer = document.createElement('canvas');\n helpLayer.width = options.sourceWidth;\n helpLayer.height = options.sourceHeight;\n options.helpLayer = helpLayer;\n }\n },\n\n /**\n * Returns object representation of an instance\n * @return {Object} Object representation of an instance\n */\n toObject: function () {\n var object = {\n type: this.type\n },\n mainP = this.mainParameter;\n\n if (mainP) {\n object[mainP] = this[mainP];\n }\n\n return object;\n },\n\n /**\n * Returns a JSON representation of an instance\n * @return {Object} JSON\n */\n toJSON: function () {\n // delegate, not alias\n return this.toObject();\n }\n});\n\nfabric.Image.filters.BaseFilter.fromObject = function (object, callback) {\n var filter = new fabric.Image.filters[object.type](object);\n callback && callback(filter);\n return filter;\n};\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n /**\n * Color Matrix filter class\n * @class fabric.Image.filters.ColorMatrix\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link fabric.Image.filters.ColorMatrix#initialize} for constructor definition\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @see {@Link http://www.webwasp.co.uk/tutorials/219/Color_Matrix_Filter.php}\n * @see {@Link http://phoboslab.org/log/2013/11/fast-image-filters-with-webgl}\n * @example <caption>Kodachrome filter</caption>\n * var filter = new fabric.Image.filters.ColorMatrix({\n * matrix: [\n 1.1285582396593525, -0.3967382283601348, -0.03992559172921793, 0, 63.72958762196502,\n -0.16404339962244616, 1.0835251566291304, -0.05498805115633132, 0, 24.732407896706203,\n -0.16786010706155763, -0.5603416277695248, 1.6014850761964943, 0, 35.62982807460946,\n 0, 0, 0, 1, 0\n ]\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n */\n\n filters.ColorMatrix = createClass(filters.BaseFilter,\n /** @lends fabric.Image.filters.ColorMatrix.prototype */\n {\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'ColorMatrix',\n fragmentSource: 'precision highp float;\\n' + 'uniform sampler2D uTexture;\\n' + 'varying vec2 vTexCoord;\\n' + 'uniform mat4 uColorMatrix;\\n' + 'uniform vec4 uConstants;\\n' + 'void main() {\\n' + 'vec4 color = texture2D(uTexture, vTexCoord);\\n' + 'color *= uColorMatrix;\\n' + 'color += uConstants;\\n' + 'gl_FragColor = color;\\n' + '}',\n\n /**\n * Colormatrix for pixels.\n * array of 20 floats. Numbers in positions 4, 9, 14, 19 loose meaning\n * outside the -1, 1 range.\n * 0.0039215686 is the part of 1 that get translated to 1 in 2d\n * @param {Array} matrix array of 20 numbers.\n * @default\n */\n matrix: [1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0],\n mainParameter: 'matrix',\n\n /**\n * Lock the colormatrix on the color part, skipping alpha, manly for non webgl scenario\n * to save some calculation\n */\n colorsOnly: true,\n\n /**\n * Constructor\n * @param {Object} [options] Options object\n */\n initialize: function (options) {\n this.callSuper('initialize', options); // create a new array instead mutating the prototype with push\n\n this.matrix = this.matrix.slice(0);\n },\n\n /**\n * Apply the ColorMatrix operation to a Uint8Array representing the pixels of an image.\n *\n * @param {Object} options\n * @param {ImageData} options.imageData The Uint8Array to be filtered.\n */\n applyTo2d: function (options) {\n var imageData = options.imageData,\n data = imageData.data,\n iLen = data.length,\n m = this.matrix,\n r,\n g,\n b,\n a,\n i,\n colorsOnly = this.colorsOnly;\n\n for (i = 0; i < iLen; i += 4) {\n r = data[i];\n g = data[i + 1];\n b = data[i + 2];\n\n if (colorsOnly) {\n data[i] = r * m[0] + g * m[1] + b * m[2] + m[4] * 255;\n data[i + 1] = r * m[5] + g * m[6] + b * m[7] + m[9] * 255;\n data[i + 2] = r * m[10] + g * m[11] + b * m[12] + m[14] * 255;\n } else {\n a = data[i + 3];\n data[i] = r * m[0] + g * m[1] + b * m[2] + a * m[3] + m[4] * 255;\n data[i + 1] = r * m[5] + g * m[6] + b * m[7] + a * m[8] + m[9] * 255;\n data[i + 2] = r * m[10] + g * m[11] + b * m[12] + a * m[13] + m[14] * 255;\n data[i + 3] = r * m[15] + g * m[16] + b * m[17] + a * m[18] + m[19] * 255;\n }\n }\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function (gl, program) {\n return {\n uColorMatrix: gl.getUniformLocation(program, 'uColorMatrix'),\n uConstants: gl.getUniformLocation(program, 'uConstants')\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function (gl, uniformLocations) {\n var m = this.matrix,\n matrix = [m[0], m[1], m[2], m[3], m[5], m[6], m[7], m[8], m[10], m[11], m[12], m[13], m[15], m[16], m[17], m[18]],\n constants = [m[4], m[9], m[14], m[19]];\n gl.uniformMatrix4fv(uniformLocations.uColorMatrix, false, matrix);\n gl.uniform4fv(uniformLocations.uConstants, constants);\n }\n });\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] function to invoke after filter creation\n * @return {fabric.Image.filters.ColorMatrix} Instance of fabric.Image.filters.ColorMatrix\n */\n\n fabric.Image.filters.ColorMatrix.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n /**\n * Brightness filter class\n * @class fabric.Image.filters.Brightness\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link fabric.Image.filters.Brightness#initialize} for constructor definition\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @example\n * var filter = new fabric.Image.filters.Brightness({\n * brightness: 0.05\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n */\n\n filters.Brightness = createClass(filters.BaseFilter,\n /** @lends fabric.Image.filters.Brightness.prototype */\n {\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'Brightness',\n\n /**\n * Fragment source for the brightness program\n */\n fragmentSource: 'precision highp float;\\n' + 'uniform sampler2D uTexture;\\n' + 'uniform float uBrightness;\\n' + 'varying vec2 vTexCoord;\\n' + 'void main() {\\n' + 'vec4 color = texture2D(uTexture, vTexCoord);\\n' + 'color.rgb += uBrightness;\\n' + 'gl_FragColor = color;\\n' + '}',\n\n /**\n * Brightness value, from -1 to 1.\n * translated to -255 to 255 for 2d\n * 0.0039215686 is the part of 1 that get translated to 1 in 2d\n * @param {Number} brightness\n * @default\n */\n brightness: 0,\n\n /**\n * Describe the property that is the filter parameter\n * @param {String} m\n * @default\n */\n mainParameter: 'brightness',\n\n /**\n * Apply the Brightness operation to a Uint8ClampedArray representing the pixels of an image.\n *\n * @param {Object} options\n * @param {ImageData} options.imageData The Uint8ClampedArray to be filtered.\n */\n applyTo2d: function (options) {\n if (this.brightness === 0) {\n return;\n }\n\n var imageData = options.imageData,\n data = imageData.data,\n i,\n len = data.length,\n brightness = Math.round(this.brightness * 255);\n\n for (i = 0; i < len; i += 4) {\n data[i] = data[i] + brightness;\n data[i + 1] = data[i + 1] + brightness;\n data[i + 2] = data[i + 2] + brightness;\n }\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function (gl, program) {\n return {\n uBrightness: gl.getUniformLocation(program, 'uBrightness')\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function (gl, uniformLocations) {\n gl.uniform1f(uniformLocations.uBrightness, this.brightness);\n }\n });\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] to be invoked after filter creation\n * @return {fabric.Image.filters.Brightness} Instance of fabric.Image.filters.Brightness\n */\n\n fabric.Image.filters.Brightness.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n extend = fabric.util.object.extend,\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n /**\n * Adapted from <a href=\"http://www.html5rocks.com/en/tutorials/canvas/imagefilters/\">html5rocks article</a>\n * @class fabric.Image.filters.Convolute\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link fabric.Image.filters.Convolute#initialize} for constructor definition\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @example <caption>Sharpen filter</caption>\n * var filter = new fabric.Image.filters.Convolute({\n * matrix: [ 0, -1, 0,\n * -1, 5, -1,\n * 0, -1, 0 ]\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n * canvas.renderAll();\n * @example <caption>Blur filter</caption>\n * var filter = new fabric.Image.filters.Convolute({\n * matrix: [ 1/9, 1/9, 1/9,\n * 1/9, 1/9, 1/9,\n * 1/9, 1/9, 1/9 ]\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n * canvas.renderAll();\n * @example <caption>Emboss filter</caption>\n * var filter = new fabric.Image.filters.Convolute({\n * matrix: [ 1, 1, 1,\n * 1, 0.7, -1,\n * -1, -1, -1 ]\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n * canvas.renderAll();\n * @example <caption>Emboss filter with opaqueness</caption>\n * var filter = new fabric.Image.filters.Convolute({\n * opaque: true,\n * matrix: [ 1, 1, 1,\n * 1, 0.7, -1,\n * -1, -1, -1 ]\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n * canvas.renderAll();\n */\n\n filters.Convolute = createClass(filters.BaseFilter,\n /** @lends fabric.Image.filters.Convolute.prototype */\n {\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'Convolute',\n\n /*\n * Opaque value (true/false)\n */\n opaque: false,\n\n /*\n * matrix for the filter, max 9x9\n */\n matrix: [0, 0, 0, 0, 1, 0, 0, 0, 0],\n\n /**\n * Fragment source for the brightness program\n */\n fragmentSource: {\n Convolute_3_1: 'precision highp float;\\n' + 'uniform sampler2D uTexture;\\n' + 'uniform float uMatrix[9];\\n' + 'uniform float uStepW;\\n' + 'uniform float uStepH;\\n' + 'varying vec2 vTexCoord;\\n' + 'void main() {\\n' + 'vec4 color = vec4(0, 0, 0, 0);\\n' + 'for (float h = 0.0; h < 3.0; h+=1.0) {\\n' + 'for (float w = 0.0; w < 3.0; w+=1.0) {\\n' + 'vec2 matrixPos = vec2(uStepW * (w - 1), uStepH * (h - 1));\\n' + 'color += texture2D(uTexture, vTexCoord + matrixPos) * uMatrix[int(h * 3.0 + w)];\\n' + '}\\n' + '}\\n' + 'gl_FragColor = color;\\n' + '}',\n Convolute_3_0: 'precision highp float;\\n' + 'uniform sampler2D uTexture;\\n' + 'uniform float uMatrix[9];\\n' + 'uniform float uStepW;\\n' + 'uniform float uStepH;\\n' + 'varying vec2 vTexCoord;\\n' + 'void main() {\\n' + 'vec4 color = vec4(0, 0, 0, 1);\\n' + 'for (float h = 0.0; h < 3.0; h+=1.0) {\\n' + 'for (float w = 0.0; w < 3.0; w+=1.0) {\\n' + 'vec2 matrixPos = vec2(uStepW * (w - 1.0), uStepH * (h - 1.0));\\n' + 'color.rgb += texture2D(uTexture, vTexCoord + matrixPos).rgb * uMatrix[int(h * 3.0 + w)];\\n' + '}\\n' + '}\\n' + 'float alpha = texture2D(uTexture, vTexCoord).a;\\n' + 'gl_FragColor = color;\\n' + 'gl_FragColor.a = alpha;\\n' + '}',\n Convolute_5_1: 'precision highp float;\\n' + 'uniform sampler2D uTexture;\\n' + 'uniform float uMatrix[25];\\n' + 'uniform float uStepW;\\n' + 'uniform float uStepH;\\n' + 'varying vec2 vTexCoord;\\n' + 'void main() {\\n' + 'vec4 color = vec4(0, 0, 0, 0);\\n' + 'for (float h = 0.0; h < 5.0; h+=1.0) {\\n' + 'for (float w = 0.0; w < 5.0; w+=1.0) {\\n' + 'vec2 matrixPos = vec2(uStepW * (w - 2.0), uStepH * (h - 2.0));\\n' + 'color += texture2D(uTexture, vTexCoord + matrixPos) * uMatrix[int(h * 5.0 + w)];\\n' + '}\\n' + '}\\n' + 'gl_FragColor = color;\\n' + '}',\n Convolute_5_0: 'precision highp float;\\n' + 'uniform sampler2D uTexture;\\n' + 'uniform float uMatrix[25];\\n' + 'uniform float uStepW;\\n' + 'uniform float uStepH;\\n' + 'varying vec2 vTexCoord;\\n' + 'void main() {\\n' + 'vec4 color = vec4(0, 0, 0, 1);\\n' + 'for (float h = 0.0; h < 5.0; h+=1.0) {\\n' + 'for (float w = 0.0; w < 5.0; w+=1.0) {\\n' + 'vec2 matrixPos = vec2(uStepW * (w - 2.0), uStepH * (h - 2.0));\\n' + 'color.rgb += texture2D(uTexture, vTexCoord + matrixPos).rgb * uMatrix[int(h * 5.0 + w)];\\n' + '}\\n' + '}\\n' + 'float alpha = texture2D(uTexture, vTexCoord).a;\\n' + 'gl_FragColor = color;\\n' + 'gl_FragColor.a = alpha;\\n' + '}',\n Convolute_7_1: 'precision highp float;\\n' + 'uniform sampler2D uTexture;\\n' + 'uniform float uMatrix[49];\\n' + 'uniform float uStepW;\\n' + 'uniform float uStepH;\\n' + 'varying vec2 vTexCoord;\\n' + 'void main() {\\n' + 'vec4 color = vec4(0, 0, 0, 0);\\n' + 'for (float h = 0.0; h < 7.0; h+=1.0) {\\n' + 'for (float w = 0.0; w < 7.0; w+=1.0) {\\n' + 'vec2 matrixPos = vec2(uStepW * (w - 3.0), uStepH * (h - 3.0));\\n' + 'color += texture2D(uTexture, vTexCoord + matrixPos) * uMatrix[int(h * 7.0 + w)];\\n' + '}\\n' + '}\\n' + 'gl_FragColor = color;\\n' + '}',\n Convolute_7_0: 'precision highp float;\\n' + 'uniform sampler2D uTexture;\\n' + 'uniform float uMatrix[49];\\n' + 'uniform float uStepW;\\n' + 'uniform float uStepH;\\n' + 'varying vec2 vTexCoord;\\n' + 'void main() {\\n' + 'vec4 color = vec4(0, 0, 0, 1);\\n' + 'for (float h = 0.0; h < 7.0; h+=1.0) {\\n' + 'for (float w = 0.0; w < 7.0; w+=1.0) {\\n' + 'vec2 matrixPos = vec2(uStepW * (w - 3.0), uStepH * (h - 3.0));\\n' + 'color.rgb += texture2D(uTexture, vTexCoord + matrixPos).rgb * uMatrix[int(h * 7.0 + w)];\\n' + '}\\n' + '}\\n' + 'float alpha = texture2D(uTexture, vTexCoord).a;\\n' + 'gl_FragColor = color;\\n' + 'gl_FragColor.a = alpha;\\n' + '}',\n Convolute_9_1: 'precision highp float;\\n' + 'uniform sampler2D uTexture;\\n' + 'uniform float uMatrix[81];\\n' + 'uniform float uStepW;\\n' + 'uniform float uStepH;\\n' + 'varying vec2 vTexCoord;\\n' + 'void main() {\\n' + 'vec4 color = vec4(0, 0, 0, 0);\\n' + 'for (float h = 0.0; h < 9.0; h+=1.0) {\\n' + 'for (float w = 0.0; w < 9.0; w+=1.0) {\\n' + 'vec2 matrixPos = vec2(uStepW * (w - 4.0), uStepH * (h - 4.0));\\n' + 'color += texture2D(uTexture, vTexCoord + matrixPos) * uMatrix[int(h * 9.0 + w)];\\n' + '}\\n' + '}\\n' + 'gl_FragColor = color;\\n' + '}',\n Convolute_9_0: 'precision highp float;\\n' + 'uniform sampler2D uTexture;\\n' + 'uniform float uMatrix[81];\\n' + 'uniform float uStepW;\\n' + 'uniform float uStepH;\\n' + 'varying vec2 vTexCoord;\\n' + 'void main() {\\n' + 'vec4 color = vec4(0, 0, 0, 1);\\n' + 'for (float h = 0.0; h < 9.0; h+=1.0) {\\n' + 'for (float w = 0.0; w < 9.0; w+=1.0) {\\n' + 'vec2 matrixPos = vec2(uStepW * (w - 4.0), uStepH * (h - 4.0));\\n' + 'color.rgb += texture2D(uTexture, vTexCoord + matrixPos).rgb * uMatrix[int(h * 9.0 + w)];\\n' + '}\\n' + '}\\n' + 'float alpha = texture2D(uTexture, vTexCoord).a;\\n' + 'gl_FragColor = color;\\n' + 'gl_FragColor.a = alpha;\\n' + '}'\n },\n\n /**\n * Constructor\n * @memberOf fabric.Image.filters.Convolute.prototype\n * @param {Object} [options] Options object\n * @param {Boolean} [options.opaque=false] Opaque value (true/false)\n * @param {Array} [options.matrix] Filter matrix\n */\n\n /**\n * Retrieves the cached shader.\n * @param {Object} options\n * @param {WebGLRenderingContext} options.context The GL context used for rendering.\n * @param {Object} options.programCache A map of compiled shader programs, keyed by filter type.\n */\n retrieveShader: function (options) {\n var size = Math.sqrt(this.matrix.length);\n var cacheKey = this.type + '_' + size + '_' + (this.opaque ? 1 : 0);\n var shaderSource = this.fragmentSource[cacheKey];\n\n if (!options.programCache.hasOwnProperty(cacheKey)) {\n options.programCache[cacheKey] = this.createProgram(options.context, shaderSource);\n }\n\n return options.programCache[cacheKey];\n },\n\n /**\n * Apply the Brightness operation to a Uint8ClampedArray representing the pixels of an image.\n *\n * @param {Object} options\n * @param {ImageData} options.imageData The Uint8ClampedArray to be filtered.\n */\n applyTo2d: function (options) {\n var imageData = options.imageData,\n data = imageData.data,\n weights = this.matrix,\n side = Math.round(Math.sqrt(weights.length)),\n halfSide = Math.floor(side / 2),\n sw = imageData.width,\n sh = imageData.height,\n output = options.ctx.createImageData(sw, sh),\n dst = output.data,\n // go through the destination image pixels\n alphaFac = this.opaque ? 1 : 0,\n r,\n g,\n b,\n a,\n dstOff,\n scx,\n scy,\n srcOff,\n wt,\n x,\n y,\n cx,\n cy;\n\n for (y = 0; y < sh; y++) {\n for (x = 0; x < sw; x++) {\n dstOff = (y * sw + x) * 4; // calculate the weighed sum of the source image pixels that\n // fall under the convolution matrix\n\n r = 0;\n g = 0;\n b = 0;\n a = 0;\n\n for (cy = 0; cy < side; cy++) {\n for (cx = 0; cx < side; cx++) {\n scy = y + cy - halfSide;\n scx = x + cx - halfSide; // eslint-disable-next-line max-depth\n\n if (scy < 0 || scy >= sh || scx < 0 || scx >= sw) {\n continue;\n }\n\n srcOff = (scy * sw + scx) * 4;\n wt = weights[cy * side + cx];\n r += data[srcOff] * wt;\n g += data[srcOff + 1] * wt;\n b += data[srcOff + 2] * wt; // eslint-disable-next-line max-depth\n\n if (!alphaFac) {\n a += data[srcOff + 3] * wt;\n }\n }\n }\n\n dst[dstOff] = r;\n dst[dstOff + 1] = g;\n dst[dstOff + 2] = b;\n\n if (!alphaFac) {\n dst[dstOff + 3] = a;\n } else {\n dst[dstOff + 3] = data[dstOff + 3];\n }\n }\n }\n\n options.imageData = output;\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function (gl, program) {\n return {\n uMatrix: gl.getUniformLocation(program, 'uMatrix'),\n uOpaque: gl.getUniformLocation(program, 'uOpaque'),\n uHalfSize: gl.getUniformLocation(program, 'uHalfSize'),\n uSize: gl.getUniformLocation(program, 'uSize')\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function (gl, uniformLocations) {\n gl.uniform1fv(uniformLocations.uMatrix, this.matrix);\n },\n\n /**\n * Returns object representation of an instance\n * @return {Object} Object representation of an instance\n */\n toObject: function () {\n return extend(this.callSuper('toObject'), {\n opaque: this.opaque,\n matrix: this.matrix\n });\n }\n });\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] to be invoked after filter creation\n * @return {fabric.Image.filters.Convolute} Instance of fabric.Image.filters.Convolute\n */\n\n fabric.Image.filters.Convolute.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n /**\n * Grayscale image filter class\n * @class fabric.Image.filters.Grayscale\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @example\n * var filter = new fabric.Image.filters.Grayscale();\n * object.filters.push(filter);\n * object.applyFilters();\n */\n\n filters.Grayscale = createClass(filters.BaseFilter,\n /** @lends fabric.Image.filters.Grayscale.prototype */\n {\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'Grayscale',\n fragmentSource: {\n average: 'precision highp float;\\n' + 'uniform sampler2D uTexture;\\n' + 'varying vec2 vTexCoord;\\n' + 'void main() {\\n' + 'vec4 color = texture2D(uTexture, vTexCoord);\\n' + 'float average = (color.r + color.b + color.g) / 3.0;\\n' + 'gl_FragColor = vec4(average, average, average, color.a);\\n' + '}',\n lightness: 'precision highp float;\\n' + 'uniform sampler2D uTexture;\\n' + 'uniform int uMode;\\n' + 'varying vec2 vTexCoord;\\n' + 'void main() {\\n' + 'vec4 col = texture2D(uTexture, vTexCoord);\\n' + 'float average = (max(max(col.r, col.g),col.b) + min(min(col.r, col.g),col.b)) / 2.0;\\n' + 'gl_FragColor = vec4(average, average, average, col.a);\\n' + '}',\n luminosity: 'precision highp float;\\n' + 'uniform sampler2D uTexture;\\n' + 'uniform int uMode;\\n' + 'varying vec2 vTexCoord;\\n' + 'void main() {\\n' + 'vec4 col = texture2D(uTexture, vTexCoord);\\n' + 'float average = 0.21 * col.r + 0.72 * col.g + 0.07 * col.b;\\n' + 'gl_FragColor = vec4(average, average, average, col.a);\\n' + '}'\n },\n\n /**\n * Grayscale mode, between 'average', 'lightness', 'luminosity'\n * @param {String} type\n * @default\n */\n mode: 'average',\n mainParameter: 'mode',\n\n /**\n * Apply the Grayscale operation to a Uint8Array representing the pixels of an image.\n *\n * @param {Object} options\n * @param {ImageData} options.imageData The Uint8Array to be filtered.\n */\n applyTo2d: function (options) {\n var imageData = options.imageData,\n data = imageData.data,\n i,\n len = data.length,\n value,\n mode = this.mode;\n\n for (i = 0; i < len; i += 4) {\n if (mode === 'average') {\n value = (data[i] + data[i + 1] + data[i + 2]) / 3;\n } else if (mode === 'lightness') {\n value = (Math.min(data[i], data[i + 1], data[i + 2]) + Math.max(data[i], data[i + 1], data[i + 2])) / 2;\n } else if (mode === 'luminosity') {\n value = 0.21 * data[i] + 0.72 * data[i + 1] + 0.07 * data[i + 2];\n }\n\n data[i] = value;\n data[i + 1] = value;\n data[i + 2] = value;\n }\n },\n\n /**\n * Retrieves the cached shader.\n * @param {Object} options\n * @param {WebGLRenderingContext} options.context The GL context used for rendering.\n * @param {Object} options.programCache A map of compiled shader programs, keyed by filter type.\n */\n retrieveShader: function (options) {\n var cacheKey = this.type + '_' + this.mode;\n\n if (!options.programCache.hasOwnProperty(cacheKey)) {\n var shaderSource = this.fragmentSource[this.mode];\n options.programCache[cacheKey] = this.createProgram(options.context, shaderSource);\n }\n\n return options.programCache[cacheKey];\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function (gl, program) {\n return {\n uMode: gl.getUniformLocation(program, 'uMode')\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function (gl, uniformLocations) {\n // default average mode.\n var mode = 1;\n gl.uniform1i(uniformLocations.uMode, mode);\n },\n\n /**\n * Grayscale filter isNeutralState implementation\n * The filter is never neutral\n * on the image\n **/\n isNeutralState: function () {\n return false;\n }\n });\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] to be invoked after filter creation\n * @return {fabric.Image.filters.Grayscale} Instance of fabric.Image.filters.Grayscale\n */\n\n fabric.Image.filters.Grayscale.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n /**\n * Invert filter class\n * @class fabric.Image.filters.Invert\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @example\n * var filter = new fabric.Image.filters.Invert();\n * object.filters.push(filter);\n * object.applyFilters(canvas.renderAll.bind(canvas));\n */\n\n filters.Invert = createClass(filters.BaseFilter,\n /** @lends fabric.Image.filters.Invert.prototype */\n {\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'Invert',\n fragmentSource: 'precision highp float;\\n' + 'uniform sampler2D uTexture;\\n' + 'uniform int uInvert;\\n' + 'varying vec2 vTexCoord;\\n' + 'void main() {\\n' + 'vec4 color = texture2D(uTexture, vTexCoord);\\n' + 'if (uInvert == 1) {\\n' + 'gl_FragColor = vec4(1.0 - color.r,1.0 -color.g,1.0 -color.b,color.a);\\n' + '} else {\\n' + 'gl_FragColor = color;\\n' + '}\\n' + '}',\n\n /**\n * Filter invert. if false, does nothing\n * @param {Boolean} invert\n * @default\n */\n invert: true,\n mainParameter: 'invert',\n\n /**\n * Apply the Invert operation to a Uint8Array representing the pixels of an image.\n *\n * @param {Object} options\n * @param {ImageData} options.imageData The Uint8Array to be filtered.\n */\n applyTo2d: function (options) {\n var imageData = options.imageData,\n data = imageData.data,\n i,\n len = data.length;\n\n for (i = 0; i < len; i += 4) {\n data[i] = 255 - data[i];\n data[i + 1] = 255 - data[i + 1];\n data[i + 2] = 255 - data[i + 2];\n }\n },\n\n /**\n * Invert filter isNeutralState implementation\n * Used only in image applyFilters to discard filters that will not have an effect\n * on the image\n * @param {Object} options\n **/\n isNeutralState: function () {\n return !this.invert;\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function (gl, program) {\n return {\n uInvert: gl.getUniformLocation(program, 'uInvert')\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function (gl, uniformLocations) {\n gl.uniform1i(uniformLocations.uInvert, this.invert);\n }\n });\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] to be invoked after filter creation\n * @return {fabric.Image.filters.Invert} Instance of fabric.Image.filters.Invert\n */\n\n fabric.Image.filters.Invert.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n extend = fabric.util.object.extend,\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n /**\n * Noise filter class\n * @class fabric.Image.filters.Noise\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link fabric.Image.filters.Noise#initialize} for constructor definition\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @example\n * var filter = new fabric.Image.filters.Noise({\n * noise: 700\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n * canvas.renderAll();\n */\n\n filters.Noise = createClass(filters.BaseFilter,\n /** @lends fabric.Image.filters.Noise.prototype */\n {\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'Noise',\n\n /**\n * Fragment source for the noise program\n */\n fragmentSource: 'precision highp float;\\n' + 'uniform sampler2D uTexture;\\n' + 'uniform float uStepH;\\n' + 'uniform float uNoise;\\n' + 'uniform float uSeed;\\n' + 'varying vec2 vTexCoord;\\n' + 'float rand(vec2 co, float seed, float vScale) {\\n' + 'return fract(sin(dot(co.xy * vScale ,vec2(12.9898 , 78.233))) * 43758.5453 * (seed + 0.01) / 2.0);\\n' + '}\\n' + 'void main() {\\n' + 'vec4 color = texture2D(uTexture, vTexCoord);\\n' + 'color.rgb += (0.5 - rand(vTexCoord, uSeed, 0.1 / uStepH)) * uNoise;\\n' + 'gl_FragColor = color;\\n' + '}',\n\n /**\n * Describe the property that is the filter parameter\n * @param {String} m\n * @default\n */\n mainParameter: 'noise',\n\n /**\n * Noise value, from\n * @param {Number} noise\n * @default\n */\n noise: 0,\n\n /**\n * Apply the Brightness operation to a Uint8ClampedArray representing the pixels of an image.\n *\n * @param {Object} options\n * @param {ImageData} options.imageData The Uint8ClampedArray to be filtered.\n */\n applyTo2d: function (options) {\n if (this.noise === 0) {\n return;\n }\n\n var imageData = options.imageData,\n data = imageData.data,\n i,\n len = data.length,\n noise = this.noise,\n rand;\n\n for (i = 0, len = data.length; i < len; i += 4) {\n rand = (0.5 - Math.random()) * noise;\n data[i] += rand;\n data[i + 1] += rand;\n data[i + 2] += rand;\n }\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function (gl, program) {\n return {\n uNoise: gl.getUniformLocation(program, 'uNoise'),\n uSeed: gl.getUniformLocation(program, 'uSeed')\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function (gl, uniformLocations) {\n gl.uniform1f(uniformLocations.uNoise, this.noise / 255);\n gl.uniform1f(uniformLocations.uSeed, Math.random());\n },\n\n /**\n * Returns object representation of an instance\n * @return {Object} Object representation of an instance\n */\n toObject: function () {\n return extend(this.callSuper('toObject'), {\n noise: this.noise\n });\n }\n });\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {Function} [callback] to be invoked after filter creation\n * @return {fabric.Image.filters.Noise} Instance of fabric.Image.filters.Noise\n */\n\n fabric.Image.filters.Noise.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n /**\n * Pixelate filter class\n * @class fabric.Image.filters.Pixelate\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link fabric.Image.filters.Pixelate#initialize} for constructor definition\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @example\n * var filter = new fabric.Image.filters.Pixelate({\n * blocksize: 8\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n */\n\n filters.Pixelate = createClass(filters.BaseFilter,\n /** @lends fabric.Image.filters.Pixelate.prototype */\n {\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'Pixelate',\n blocksize: 4,\n mainParameter: 'blocksize',\n\n /**\n * Fragment source for the Pixelate program\n */\n fragmentSource: 'precision highp float;\\n' + 'uniform sampler2D uTexture;\\n' + 'uniform float uBlocksize;\\n' + 'uniform float uStepW;\\n' + 'uniform float uStepH;\\n' + 'varying vec2 vTexCoord;\\n' + 'void main() {\\n' + 'float blockW = uBlocksize * uStepW;\\n' + 'float blockH = uBlocksize * uStepW;\\n' + 'int posX = int(vTexCoord.x / blockW);\\n' + 'int posY = int(vTexCoord.y / blockH);\\n' + 'float fposX = float(posX);\\n' + 'float fposY = float(posY);\\n' + 'vec2 squareCoords = vec2(fposX * blockW, fposY * blockH);\\n' + 'vec4 color = texture2D(uTexture, squareCoords);\\n' + 'gl_FragColor = color;\\n' + '}',\n\n /**\n * Apply the Pixelate operation to a Uint8ClampedArray representing the pixels of an image.\n *\n * @param {Object} options\n * @param {ImageData} options.imageData The Uint8ClampedArray to be filtered.\n */\n applyTo2d: function (options) {\n var imageData = options.imageData,\n data = imageData.data,\n iLen = imageData.height,\n jLen = imageData.width,\n index,\n i,\n j,\n r,\n g,\n b,\n a,\n _i,\n _j,\n _iLen,\n _jLen;\n\n for (i = 0; i < iLen; i += this.blocksize) {\n for (j = 0; j < jLen; j += this.blocksize) {\n index = i * 4 * jLen + j * 4;\n r = data[index];\n g = data[index + 1];\n b = data[index + 2];\n a = data[index + 3];\n _iLen = Math.min(i + this.blocksize, iLen);\n _jLen = Math.min(j + this.blocksize, jLen);\n\n for (_i = i; _i < _iLen; _i++) {\n for (_j = j; _j < _jLen; _j++) {\n index = _i * 4 * jLen + _j * 4;\n data[index] = r;\n data[index + 1] = g;\n data[index + 2] = b;\n data[index + 3] = a;\n }\n }\n }\n }\n },\n\n /**\n * Indicate when the filter is not gonna apply changes to the image\n **/\n isNeutralState: function () {\n return this.blocksize === 1;\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function (gl, program) {\n return {\n uBlocksize: gl.getUniformLocation(program, 'uBlocksize'),\n uStepW: gl.getUniformLocation(program, 'uStepW'),\n uStepH: gl.getUniformLocation(program, 'uStepH')\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function (gl, uniformLocations) {\n gl.uniform1f(uniformLocations.uBlocksize, this.blocksize);\n }\n });\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {Function} [callback] to be invoked after filter creation\n * @return {fabric.Image.filters.Pixelate} Instance of fabric.Image.filters.Pixelate\n */\n\n fabric.Image.filters.Pixelate.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n extend = fabric.util.object.extend,\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n /**\n * Remove white filter class\n * @class fabric.Image.filters.RemoveColor\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link fabric.Image.filters.RemoveColor#initialize} for constructor definition\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @example\n * var filter = new fabric.Image.filters.RemoveColor({\n * threshold: 0.2,\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n * canvas.renderAll();\n */\n\n filters.RemoveColor = createClass(filters.BaseFilter,\n /** @lends fabric.Image.filters.RemoveColor.prototype */\n {\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'RemoveColor',\n\n /**\n * Color to remove, in any format understood by fabric.Color.\n * @param {String} type\n * @default\n */\n color: '#FFFFFF',\n\n /**\n * Fragment source for the brightness program\n */\n fragmentSource: 'precision highp float;\\n' + 'uniform sampler2D uTexture;\\n' + 'uniform vec4 uLow;\\n' + 'uniform vec4 uHigh;\\n' + 'varying vec2 vTexCoord;\\n' + 'void main() {\\n' + 'gl_FragColor = texture2D(uTexture, vTexCoord);\\n' + 'if(all(greaterThan(gl_FragColor.rgb,uLow.rgb)) && all(greaterThan(uHigh.rgb,gl_FragColor.rgb))) {\\n' + 'gl_FragColor.a = 0.0;\\n' + '}\\n' + '}',\n\n /**\n * distance to actual color, as value up or down from each r,g,b\n * between 0 and 1\n **/\n distance: 0.02,\n\n /**\n * For color to remove inside distance, use alpha channel for a smoother deletion\n * NOT IMPLEMENTED YET\n **/\n useAlpha: false,\n\n /**\n * Constructor\n * @memberOf fabric.Image.filters.RemoveWhite.prototype\n * @param {Object} [options] Options object\n * @param {Number} [options.color=#RRGGBB] Threshold value\n * @param {Number} [options.distance=10] Distance value\n */\n\n /**\n * Applies filter to canvas element\n * @param {Object} canvasEl Canvas element to apply filter to\n */\n applyTo2d: function (options) {\n var imageData = options.imageData,\n data = imageData.data,\n i,\n distance = this.distance * 255,\n r,\n g,\n b,\n source = new fabric.Color(this.color).getSource(),\n lowC = [source[0] - distance, source[1] - distance, source[2] - distance],\n highC = [source[0] + distance, source[1] + distance, source[2] + distance];\n\n for (i = 0; i < data.length; i += 4) {\n r = data[i];\n g = data[i + 1];\n b = data[i + 2];\n\n if (r > lowC[0] && g > lowC[1] && b > lowC[2] && r < highC[0] && g < highC[1] && b < highC[2]) {\n data[i + 3] = 0;\n }\n }\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function (gl, program) {\n return {\n uLow: gl.getUniformLocation(program, 'uLow'),\n uHigh: gl.getUniformLocation(program, 'uHigh')\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function (gl, uniformLocations) {\n var source = new fabric.Color(this.color).getSource(),\n distance = parseFloat(this.distance),\n lowC = [0 + source[0] / 255 - distance, 0 + source[1] / 255 - distance, 0 + source[2] / 255 - distance, 1],\n highC = [source[0] / 255 + distance, source[1] / 255 + distance, source[2] / 255 + distance, 1];\n gl.uniform4fv(uniformLocations.uLow, lowC);\n gl.uniform4fv(uniformLocations.uHigh, highC);\n },\n\n /**\n * Returns object representation of an instance\n * @return {Object} Object representation of an instance\n */\n toObject: function () {\n return extend(this.callSuper('toObject'), {\n color: this.color,\n distance: this.distance\n });\n }\n });\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {Function} [callback] to be invoked after filter creation\n * @return {fabric.Image.filters.RemoveColor} Instance of fabric.Image.filters.RemoveWhite\n */\n\n fabric.Image.filters.RemoveColor.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n var matrices = {\n Brownie: [0.59970, 0.34553, -0.27082, 0, 0.186, -0.03770, 0.86095, 0.15059, 0, -0.1449, 0.24113, -0.07441, 0.44972, 0, -0.02965, 0, 0, 0, 1, 0],\n Vintage: [0.62793, 0.32021, -0.03965, 0, 0.03784, 0.02578, 0.64411, 0.03259, 0, 0.02926, 0.04660, -0.08512, 0.52416, 0, 0.02023, 0, 0, 0, 1, 0],\n Kodachrome: [1.12855, -0.39673, -0.03992, 0, 0.24991, -0.16404, 1.08352, -0.05498, 0, 0.09698, -0.16786, -0.56034, 1.60148, 0, 0.13972, 0, 0, 0, 1, 0],\n Technicolor: [1.91252, -0.85453, -0.09155, 0, 0.04624, -0.30878, 1.76589, -0.10601, 0, -0.27589, -0.23110, -0.75018, 1.84759, 0, 0.12137, 0, 0, 0, 1, 0],\n Polaroid: [1.438, -0.062, -0.062, 0, 0, -0.122, 1.378, -0.122, 0, 0, -0.016, -0.016, 1.483, 0, 0, 0, 0, 0, 1, 0],\n Sepia: [0.393, 0.769, 0.189, 0, 0, 0.349, 0.686, 0.168, 0, 0, 0.272, 0.534, 0.131, 0, 0, 0, 0, 0, 1, 0],\n BlackWhite: [1.5, 1.5, 1.5, 0, -1, 1.5, 1.5, 1.5, 0, -1, 1.5, 1.5, 1.5, 0, -1, 0, 0, 0, 1, 0]\n };\n\n for (var key in matrices) {\n filters[key] = createClass(filters.ColorMatrix,\n /** @lends fabric.Image.filters.Sepia.prototype */\n {\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: key,\n\n /**\n * Colormatrix for the effect\n * array of 20 floats. Numbers in positions 4, 9, 14, 19 loose meaning\n * outside the -1, 1 range.\n * @param {Array} matrix array of 20 numbers.\n * @default\n */\n matrix: matrices[key],\n\n /**\n * Lock the matrix export for this kind of static, parameter less filters.\n */\n mainParameter: false,\n\n /**\n * Lock the colormatrix on the color part, skipping alpha\n */\n colorsOnly: true\n });\n fabric.Image.filters[key].fromObject = fabric.Image.filters.BaseFilter.fromObject;\n }\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric,\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n /**\n * Color Blend filter class\n * @class fabric.Image.filter.BlendColor\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @example\n * var filter = new fabric.Image.filters.BlendColor({\n * color: '#000',\n * mode: 'multiply'\n * });\n *\n * var filter = new fabric.Image.filters.BlendImage({\n * image: fabricImageObject,\n * mode: 'multiply',\n * alpha: 0.5\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n * canvas.renderAll();\n */\n\n filters.BlendColor = createClass(filters.BaseFilter,\n /** @lends fabric.Image.filters.Blend.prototype */\n {\n type: 'BlendColor',\n\n /**\n * Color to make the blend operation with. default to a reddish color since black or white\n * gives always strong result.\n **/\n color: '#F95C63',\n\n /**\n * Blend mode for the filter: one of multiply, add, diff, screen, subtract,\n * darken, lighten, overlay, exclusion, tint.\n **/\n mode: 'multiply',\n\n /**\n * alpha value. represent the strength of the blend color operation.\n **/\n alpha: 1,\n\n /**\n * Fragment source for the Multiply program\n */\n fragmentSource: {\n multiply: 'gl_FragColor.rgb *= uColor.rgb;\\n',\n screen: 'gl_FragColor.rgb = 1.0 - (1.0 - gl_FragColor.rgb) * (1.0 - uColor.rgb);\\n',\n add: 'gl_FragColor.rgb += uColor.rgb;\\n',\n diff: 'gl_FragColor.rgb = abs(gl_FragColor.rgb - uColor.rgb);\\n',\n subtract: 'gl_FragColor.rgb -= uColor.rgb;\\n',\n lighten: 'gl_FragColor.rgb = max(gl_FragColor.rgb, uColor.rgb);\\n',\n darken: 'gl_FragColor.rgb = min(gl_FragColor.rgb, uColor.rgb);\\n',\n exclusion: 'gl_FragColor.rgb += uColor.rgb - 2.0 * (uColor.rgb * gl_FragColor.rgb);\\n',\n overlay: 'if (uColor.r < 0.5) {\\n' + 'gl_FragColor.r *= 2.0 * uColor.r;\\n' + '} else {\\n' + 'gl_FragColor.r = 1.0 - 2.0 * (1.0 - gl_FragColor.r) * (1.0 - uColor.r);\\n' + '}\\n' + 'if (uColor.g < 0.5) {\\n' + 'gl_FragColor.g *= 2.0 * uColor.g;\\n' + '} else {\\n' + 'gl_FragColor.g = 1.0 - 2.0 * (1.0 - gl_FragColor.g) * (1.0 - uColor.g);\\n' + '}\\n' + 'if (uColor.b < 0.5) {\\n' + 'gl_FragColor.b *= 2.0 * uColor.b;\\n' + '} else {\\n' + 'gl_FragColor.b = 1.0 - 2.0 * (1.0 - gl_FragColor.b) * (1.0 - uColor.b);\\n' + '}\\n',\n tint: 'gl_FragColor.rgb *= (1.0 - uColor.a);\\n' + 'gl_FragColor.rgb += uColor.rgb;\\n'\n },\n\n /**\n * build the fragment source for the filters, joining the common part with\n * the specific one.\n * @param {String} mode the mode of the filter, a key of this.fragmentSource\n * @return {String} the source to be compiled\n * @private\n */\n buildSource: function (mode) {\n return 'precision highp float;\\n' + 'uniform sampler2D uTexture;\\n' + 'uniform vec4 uColor;\\n' + 'varying vec2 vTexCoord;\\n' + 'void main() {\\n' + 'vec4 color = texture2D(uTexture, vTexCoord);\\n' + 'gl_FragColor = color;\\n' + 'if (color.a > 0.0) {\\n' + this.fragmentSource[mode] + '}\\n' + '}';\n },\n\n /**\n * Retrieves the cached shader.\n * @param {Object} options\n * @param {WebGLRenderingContext} options.context The GL context used for rendering.\n * @param {Object} options.programCache A map of compiled shader programs, keyed by filter type.\n */\n retrieveShader: function (options) {\n var cacheKey = this.type + '_' + this.mode,\n shaderSource;\n\n if (!options.programCache.hasOwnProperty(cacheKey)) {\n shaderSource = this.buildSource(this.mode);\n options.programCache[cacheKey] = this.createProgram(options.context, shaderSource);\n }\n\n return options.programCache[cacheKey];\n },\n\n /**\n * Apply the Blend operation to a Uint8ClampedArray representing the pixels of an image.\n *\n * @param {Object} options\n * @param {ImageData} options.imageData The Uint8ClampedArray to be filtered.\n */\n applyTo2d: function (options) {\n var imageData = options.imageData,\n data = imageData.data,\n iLen = data.length,\n tr,\n tg,\n tb,\n r,\n g,\n b,\n source,\n alpha1 = 1 - this.alpha;\n source = new fabric.Color(this.color).getSource();\n tr = source[0] * this.alpha;\n tg = source[1] * this.alpha;\n tb = source[2] * this.alpha;\n\n for (var i = 0; i < iLen; i += 4) {\n r = data[i];\n g = data[i + 1];\n b = data[i + 2];\n\n switch (this.mode) {\n case 'multiply':\n data[i] = r * tr / 255;\n data[i + 1] = g * tg / 255;\n data[i + 2] = b * tb / 255;\n break;\n\n case 'screen':\n data[i] = 255 - (255 - r) * (255 - tr) / 255;\n data[i + 1] = 255 - (255 - g) * (255 - tg) / 255;\n data[i + 2] = 255 - (255 - b) * (255 - tb) / 255;\n break;\n\n case 'add':\n data[i] = r + tr;\n data[i + 1] = g + tg;\n data[i + 2] = b + tb;\n break;\n\n case 'diff':\n case 'difference':\n data[i] = Math.abs(r - tr);\n data[i + 1] = Math.abs(g - tg);\n data[i + 2] = Math.abs(b - tb);\n break;\n\n case 'subtract':\n data[i] = r - tr;\n data[i + 1] = g - tg;\n data[i + 2] = b - tb;\n break;\n\n case 'darken':\n data[i] = Math.min(r, tr);\n data[i + 1] = Math.min(g, tg);\n data[i + 2] = Math.min(b, tb);\n break;\n\n case 'lighten':\n data[i] = Math.max(r, tr);\n data[i + 1] = Math.max(g, tg);\n data[i + 2] = Math.max(b, tb);\n break;\n\n case 'overlay':\n data[i] = tr < 128 ? 2 * r * tr / 255 : 255 - 2 * (255 - r) * (255 - tr) / 255;\n data[i + 1] = tg < 128 ? 2 * g * tg / 255 : 255 - 2 * (255 - g) * (255 - tg) / 255;\n data[i + 2] = tb < 128 ? 2 * b * tb / 255 : 255 - 2 * (255 - b) * (255 - tb) / 255;\n break;\n\n case 'exclusion':\n data[i] = tr + r - 2 * tr * r / 255;\n data[i + 1] = tg + g - 2 * tg * g / 255;\n data[i + 2] = tb + b - 2 * tb * b / 255;\n break;\n\n case 'tint':\n data[i] = tr + r * alpha1;\n data[i + 1] = tg + g * alpha1;\n data[i + 2] = tb + b * alpha1;\n }\n }\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function (gl, program) {\n return {\n uColor: gl.getUniformLocation(program, 'uColor')\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function (gl, uniformLocations) {\n var source = new fabric.Color(this.color).getSource();\n source[0] = this.alpha * source[0] / 255;\n source[1] = this.alpha * source[1] / 255;\n source[2] = this.alpha * source[2] / 255;\n source[3] = this.alpha;\n gl.uniform4fv(uniformLocations.uColor, source);\n },\n\n /**\n * Returns object representation of an instance\n * @return {Object} Object representation of an instance\n */\n toObject: function () {\n return {\n type: this.type,\n color: this.color,\n mode: this.mode,\n alpha: this.alpha\n };\n }\n });\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] to be invoked after filter creation\n * @return {fabric.Image.filters.BlendColor} Instance of fabric.Image.filters.BlendColor\n */\n\n fabric.Image.filters.BlendColor.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric,\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n /**\n * Image Blend filter class\n * @class fabric.Image.filter.BlendImage\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @example\n * var filter = new fabric.Image.filters.BlendColor({\n * color: '#000',\n * mode: 'multiply'\n * });\n *\n * var filter = new fabric.Image.filters.BlendImage({\n * image: fabricImageObject,\n * mode: 'multiply',\n * alpha: 0.5\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n * canvas.renderAll();\n */\n\n filters.BlendImage = createClass(filters.BaseFilter,\n /** @lends fabric.Image.filters.BlendImage.prototype */\n {\n type: 'BlendImage',\n\n /**\n * Color to make the blend operation with. default to a reddish color since black or white\n * gives always strong result.\n **/\n image: null,\n\n /**\n * Blend mode for the filter: one of multiply, add, diff, screen, subtract,\n * darken, lighten, overlay, exclusion, tint.\n **/\n mode: 'multiply',\n\n /**\n * alpha value. represent the strength of the blend image operation.\n * not implemented.\n **/\n alpha: 1,\n vertexSource: 'attribute vec2 aPosition;\\n' + 'varying vec2 vTexCoord;\\n' + 'varying vec2 vTexCoord2;\\n' + 'uniform mat3 uTransformMatrix;\\n' + 'void main() {\\n' + 'vTexCoord = aPosition;\\n' + 'vTexCoord2 = (uTransformMatrix * vec3(aPosition, 1.0)).xy;\\n' + 'gl_Position = vec4(aPosition * 2.0 - 1.0, 0.0, 1.0);\\n' + '}',\n\n /**\n * Fragment source for the Multiply program\n */\n fragmentSource: {\n multiply: 'precision highp float;\\n' + 'uniform sampler2D uTexture;\\n' + 'uniform sampler2D uImage;\\n' + 'uniform vec4 uColor;\\n' + 'varying vec2 vTexCoord;\\n' + 'varying vec2 vTexCoord2;\\n' + 'void main() {\\n' + 'vec4 color = texture2D(uTexture, vTexCoord);\\n' + 'vec4 color2 = texture2D(uImage, vTexCoord2);\\n' + 'color.rgba *= color2.rgba;\\n' + 'gl_FragColor = color;\\n' + '}',\n mask: 'precision highp float;\\n' + 'uniform sampler2D uTexture;\\n' + 'uniform sampler2D uImage;\\n' + 'uniform vec4 uColor;\\n' + 'varying vec2 vTexCoord;\\n' + 'varying vec2 vTexCoord2;\\n' + 'void main() {\\n' + 'vec4 color = texture2D(uTexture, vTexCoord);\\n' + 'vec4 color2 = texture2D(uImage, vTexCoord2);\\n' + 'color.a = color2.a;\\n' + 'gl_FragColor = color;\\n' + '}'\n },\n\n /**\n * Retrieves the cached shader.\n * @param {Object} options\n * @param {WebGLRenderingContext} options.context The GL context used for rendering.\n * @param {Object} options.programCache A map of compiled shader programs, keyed by filter type.\n */\n retrieveShader: function (options) {\n var cacheKey = this.type + '_' + this.mode;\n var shaderSource = this.fragmentSource[this.mode];\n\n if (!options.programCache.hasOwnProperty(cacheKey)) {\n options.programCache[cacheKey] = this.createProgram(options.context, shaderSource);\n }\n\n return options.programCache[cacheKey];\n },\n applyToWebGL: function (options) {\n // load texture to blend.\n var gl = options.context,\n texture = this.createTexture(options.filterBackend, this.image);\n this.bindAdditionalTexture(gl, texture, gl.TEXTURE1);\n this.callSuper('applyToWebGL', options);\n this.unbindAdditionalTexture(gl, gl.TEXTURE1);\n },\n createTexture: function (backend, image) {\n return backend.getCachedTexture(image.cacheKey, image._element);\n },\n\n /**\n * Calculate a transformMatrix to adapt the image to blend over\n * @param {Object} options\n * @param {WebGLRenderingContext} options.context The GL context used for rendering.\n * @param {Object} options.programCache A map of compiled shader programs, keyed by filter type.\n */\n calculateMatrix: function () {\n var image = this.image,\n width = image._element.width,\n height = image._element.height;\n return [1 / image.scaleX, 0, 0, 0, 1 / image.scaleY, 0, -image.left / width, -image.top / height, 1];\n },\n\n /**\n * Apply the Blend operation to a Uint8ClampedArray representing the pixels of an image.\n *\n * @param {Object} options\n * @param {ImageData} options.imageData The Uint8ClampedArray to be filtered.\n */\n applyTo2d: function (options) {\n var imageData = options.imageData,\n resources = options.filterBackend.resources,\n data = imageData.data,\n iLen = data.length,\n width = imageData.width,\n height = imageData.height,\n tr,\n tg,\n tb,\n ta,\n r,\n g,\n b,\n a,\n canvas1,\n context,\n image = this.image,\n blendData;\n\n if (!resources.blendImage) {\n resources.blendImage = fabric.util.createCanvasElement();\n }\n\n canvas1 = resources.blendImage;\n context = canvas1.getContext('2d');\n\n if (canvas1.width !== width || canvas1.height !== height) {\n canvas1.width = width;\n canvas1.height = height;\n } else {\n context.clearRect(0, 0, width, height);\n }\n\n context.setTransform(image.scaleX, 0, 0, image.scaleY, image.left, image.top);\n context.drawImage(image._element, 0, 0, width, height);\n blendData = context.getImageData(0, 0, width, height).data;\n\n for (var i = 0; i < iLen; i += 4) {\n r = data[i];\n g = data[i + 1];\n b = data[i + 2];\n a = data[i + 3];\n tr = blendData[i];\n tg = blendData[i + 1];\n tb = blendData[i + 2];\n ta = blendData[i + 3];\n\n switch (this.mode) {\n case 'multiply':\n data[i] = r * tr / 255;\n data[i + 1] = g * tg / 255;\n data[i + 2] = b * tb / 255;\n data[i + 3] = a * ta / 255;\n break;\n\n case 'mask':\n data[i + 3] = ta;\n break;\n }\n }\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function (gl, program) {\n return {\n uTransformMatrix: gl.getUniformLocation(program, 'uTransformMatrix'),\n uImage: gl.getUniformLocation(program, 'uImage')\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function (gl, uniformLocations) {\n var matrix = this.calculateMatrix();\n gl.uniform1i(uniformLocations.uImage, 1); // texture unit 1.\n\n gl.uniformMatrix3fv(uniformLocations.uTransformMatrix, false, matrix);\n },\n\n /**\n * Returns object representation of an instance\n * @return {Object} Object representation of an instance\n */\n toObject: function () {\n return {\n type: this.type,\n image: this.image && this.image.toObject(),\n mode: this.mode,\n alpha: this.alpha\n };\n }\n });\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {function} callback to be invoked after filter creation\n * @return {fabric.Image.filters.BlendImage} Instance of fabric.Image.filters.BlendImage\n */\n\n fabric.Image.filters.BlendImage.fromObject = function (object, callback) {\n fabric.Image.fromObject(object.image, function (image) {\n var options = fabric.util.object.clone(object);\n options.image = image;\n callback(new fabric.Image.filters.BlendImage(options));\n });\n };\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n pow = Math.pow,\n floor = Math.floor,\n sqrt = Math.sqrt,\n abs = Math.abs,\n round = Math.round,\n sin = Math.sin,\n ceil = Math.ceil,\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n /**\n * Resize image filter class\n * @class fabric.Image.filters.Resize\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @example\n * var filter = new fabric.Image.filters.Resize();\n * object.filters.push(filter);\n * object.applyFilters(canvas.renderAll.bind(canvas));\n */\n\n filters.Resize = createClass(filters.BaseFilter,\n /** @lends fabric.Image.filters.Resize.prototype */\n {\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'Resize',\n\n /**\n * Resize type\n * for webgl resizeType is just lanczos, for canvas2d can be:\n * bilinear, hermite, sliceHack, lanczos.\n * @param {String} resizeType\n * @default\n */\n resizeType: 'hermite',\n\n /**\n * Scale factor for resizing, x axis\n * @param {Number} scaleX\n * @default\n */\n scaleX: 1,\n\n /**\n * Scale factor for resizing, y axis\n * @param {Number} scaleY\n * @default\n */\n scaleY: 1,\n\n /**\n * LanczosLobes parameter for lanczos filter, valid for resizeType lanczos\n * @param {Number} lanczosLobes\n * @default\n */\n lanczosLobes: 3,\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function (gl, program) {\n return {\n uDelta: gl.getUniformLocation(program, 'uDelta'),\n uTaps: gl.getUniformLocation(program, 'uTaps')\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function (gl, uniformLocations) {\n gl.uniform2fv(uniformLocations.uDelta, this.horizontal ? [1 / this.width, 0] : [0, 1 / this.height]);\n gl.uniform1fv(uniformLocations.uTaps, this.taps);\n },\n\n /**\n * Retrieves the cached shader.\n * @param {Object} options\n * @param {WebGLRenderingContext} options.context The GL context used for rendering.\n * @param {Object} options.programCache A map of compiled shader programs, keyed by filter type.\n */\n retrieveShader: function (options) {\n var filterWindow = this.getFilterWindow(),\n cacheKey = this.type + '_' + filterWindow;\n\n if (!options.programCache.hasOwnProperty(cacheKey)) {\n var fragmentShader = this.generateShader(filterWindow);\n options.programCache[cacheKey] = this.createProgram(options.context, fragmentShader);\n }\n\n return options.programCache[cacheKey];\n },\n getFilterWindow: function () {\n var scale = this.tempScale;\n return Math.ceil(this.lanczosLobes / scale);\n },\n getTaps: function () {\n var lobeFunction = this.lanczosCreate(this.lanczosLobes),\n scale = this.tempScale,\n filterWindow = this.getFilterWindow(),\n taps = new Array(filterWindow);\n\n for (var i = 1; i <= filterWindow; i++) {\n taps[i - 1] = lobeFunction(i * scale);\n }\n\n return taps;\n },\n\n /**\n * Generate vertex and shader sources from the necessary steps numbers\n * @param {Number} filterWindow\n */\n generateShader: function (filterWindow) {\n var offsets = new Array(filterWindow),\n fragmentShader = this.fragmentSourceTOP,\n filterWindow;\n\n for (var i = 1; i <= filterWindow; i++) {\n offsets[i - 1] = i + '.0 * uDelta';\n }\n\n fragmentShader += 'uniform float uTaps[' + filterWindow + '];\\n';\n fragmentShader += 'void main() {\\n';\n fragmentShader += ' vec4 color = texture2D(uTexture, vTexCoord);\\n';\n fragmentShader += ' float sum = 1.0;\\n';\n offsets.forEach(function (offset, i) {\n fragmentShader += ' color += texture2D(uTexture, vTexCoord + ' + offset + ') * uTaps[' + i + '];\\n';\n fragmentShader += ' color += texture2D(uTexture, vTexCoord - ' + offset + ') * uTaps[' + i + '];\\n';\n fragmentShader += ' sum += 2.0 * uTaps[' + i + '];\\n';\n });\n fragmentShader += ' gl_FragColor = color / sum;\\n';\n fragmentShader += '}';\n return fragmentShader;\n },\n fragmentSourceTOP: 'precision highp float;\\n' + 'uniform sampler2D uTexture;\\n' + 'uniform vec2 uDelta;\\n' + 'varying vec2 vTexCoord;\\n',\n\n /**\n * Apply the resize filter to the image\n * Determines whether to use WebGL or Canvas2D based on the options.webgl flag.\n *\n * @param {Object} options\n * @param {Number} options.passes The number of filters remaining to be executed\n * @param {Boolean} options.webgl Whether to use webgl to render the filter.\n * @param {WebGLTexture} options.sourceTexture The texture setup as the source to be filtered.\n * @param {WebGLTexture} options.targetTexture The texture where filtered output should be drawn.\n * @param {WebGLRenderingContext} options.context The GL context used for rendering.\n * @param {Object} options.programCache A map of compiled shader programs, keyed by filter type.\n */\n applyTo: function (options) {\n if (options.webgl) {\n options.passes++;\n this.width = options.sourceWidth;\n this.horizontal = true;\n this.dW = Math.round(this.width * this.scaleX);\n this.dH = options.sourceHeight;\n this.tempScale = this.dW / this.width;\n this.taps = this.getTaps();\n options.destinationWidth = this.dW;\n\n this._setupFrameBuffer(options);\n\n this.applyToWebGL(options);\n\n this._swapTextures(options);\n\n options.sourceWidth = options.destinationWidth;\n this.height = options.sourceHeight;\n this.horizontal = false;\n this.dH = Math.round(this.height * this.scaleY);\n this.tempScale = this.dH / this.height;\n this.taps = this.getTaps();\n options.destinationHeight = this.dH;\n\n this._setupFrameBuffer(options);\n\n this.applyToWebGL(options);\n\n this._swapTextures(options);\n\n options.sourceHeight = options.destinationHeight;\n } else {\n this.applyTo2d(options);\n }\n },\n isNeutralState: function () {\n return this.scaleX === 1 && this.scaleY === 1;\n },\n lanczosCreate: function (lobes) {\n return function (x) {\n if (x >= lobes || x <= -lobes) {\n return 0.0;\n }\n\n if (x < 1.19209290E-07 && x > -1.19209290E-07) {\n return 1.0;\n }\n\n x *= Math.PI;\n var xx = x / lobes;\n return sin(x) / x * sin(xx) / xx;\n };\n },\n\n /**\n * Applies filter to canvas element\n * @memberOf fabric.Image.filters.Resize.prototype\n * @param {Object} canvasEl Canvas element to apply filter to\n * @param {Number} scaleX\n * @param {Number} scaleY\n */\n applyTo2d: function (options) {\n var imageData = options.imageData,\n scaleX = this.scaleX,\n scaleY = this.scaleY;\n this.rcpScaleX = 1 / scaleX;\n this.rcpScaleY = 1 / scaleY;\n var oW = imageData.width,\n oH = imageData.height,\n dW = round(oW * scaleX),\n dH = round(oH * scaleY),\n newData;\n\n if (this.resizeType === 'sliceHack') {\n newData = this.sliceByTwo(options, oW, oH, dW, dH);\n } else if (this.resizeType === 'hermite') {\n newData = this.hermiteFastResize(options, oW, oH, dW, dH);\n } else if (this.resizeType === 'bilinear') {\n newData = this.bilinearFiltering(options, oW, oH, dW, dH);\n } else if (this.resizeType === 'lanczos') {\n newData = this.lanczosResize(options, oW, oH, dW, dH);\n }\n\n options.imageData = newData;\n },\n\n /**\n * Filter sliceByTwo\n * @param {Object} canvasEl Canvas element to apply filter to\n * @param {Number} oW Original Width\n * @param {Number} oH Original Height\n * @param {Number} dW Destination Width\n * @param {Number} dH Destination Height\n * @returns {ImageData}\n */\n sliceByTwo: function (options, oW, oH, dW, dH) {\n var imageData = options.imageData,\n mult = 0.5,\n doneW = false,\n doneH = false,\n stepW = oW * mult,\n stepH = oH * mult,\n resources = fabric.filterBackend.resources,\n tmpCanvas,\n ctx,\n sX = 0,\n sY = 0,\n dX = oW,\n dY = 0;\n\n if (!resources.sliceByTwo) {\n resources.sliceByTwo = document.createElement('canvas');\n }\n\n tmpCanvas = resources.sliceByTwo;\n\n if (tmpCanvas.width < oW * 1.5 || tmpCanvas.height < oH) {\n tmpCanvas.width = oW * 1.5;\n tmpCanvas.height = oH;\n }\n\n ctx = tmpCanvas.getContext('2d');\n ctx.clearRect(0, 0, oW * 1.5, oH);\n ctx.putImageData(imageData, 0, 0);\n dW = floor(dW);\n dH = floor(dH);\n\n while (!doneW || !doneH) {\n oW = stepW;\n oH = stepH;\n\n if (dW < floor(stepW * mult)) {\n stepW = floor(stepW * mult);\n } else {\n stepW = dW;\n doneW = true;\n }\n\n if (dH < floor(stepH * mult)) {\n stepH = floor(stepH * mult);\n } else {\n stepH = dH;\n doneH = true;\n }\n\n ctx.drawImage(tmpCanvas, sX, sY, oW, oH, dX, dY, stepW, stepH);\n sX = dX;\n sY = dY;\n dY += stepH;\n }\n\n return ctx.getImageData(sX, sY, dW, dH);\n },\n\n /**\n * Filter lanczosResize\n * @param {Object} canvasEl Canvas element to apply filter to\n * @param {Number} oW Original Width\n * @param {Number} oH Original Height\n * @param {Number} dW Destination Width\n * @param {Number} dH Destination Height\n * @returns {ImageData}\n */\n lanczosResize: function (options, oW, oH, dW, dH) {\n function process(u) {\n var v, i, weight, idx, a, red, green, blue, alpha, fX, fY;\n center.x = (u + 0.5) * ratioX;\n icenter.x = floor(center.x);\n\n for (v = 0; v < dH; v++) {\n center.y = (v + 0.5) * ratioY;\n icenter.y = floor(center.y);\n a = 0;\n red = 0;\n green = 0;\n blue = 0;\n alpha = 0;\n\n for (i = icenter.x - range2X; i <= icenter.x + range2X; i++) {\n if (i < 0 || i >= oW) {\n continue;\n }\n\n fX = floor(1000 * abs(i - center.x));\n\n if (!cacheLanc[fX]) {\n cacheLanc[fX] = {};\n }\n\n for (var j = icenter.y - range2Y; j <= icenter.y + range2Y; j++) {\n if (j < 0 || j >= oH) {\n continue;\n }\n\n fY = floor(1000 * abs(j - center.y));\n\n if (!cacheLanc[fX][fY]) {\n cacheLanc[fX][fY] = lanczos(sqrt(pow(fX * rcpRatioX, 2) + pow(fY * rcpRatioY, 2)) / 1000);\n }\n\n weight = cacheLanc[fX][fY];\n\n if (weight > 0) {\n idx = (j * oW + i) * 4;\n a += weight;\n red += weight * srcData[idx];\n green += weight * srcData[idx + 1];\n blue += weight * srcData[idx + 2];\n alpha += weight * srcData[idx + 3];\n }\n }\n }\n\n idx = (v * dW + u) * 4;\n destData[idx] = red / a;\n destData[idx + 1] = green / a;\n destData[idx + 2] = blue / a;\n destData[idx + 3] = alpha / a;\n }\n\n if (++u < dW) {\n return process(u);\n } else {\n return destImg;\n }\n }\n\n var srcData = options.imageData.data,\n destImg = options.ctx.createImageData(dW, dH),\n destData = destImg.data,\n lanczos = this.lanczosCreate(this.lanczosLobes),\n ratioX = this.rcpScaleX,\n ratioY = this.rcpScaleY,\n rcpRatioX = 2 / this.rcpScaleX,\n rcpRatioY = 2 / this.rcpScaleY,\n range2X = ceil(ratioX * this.lanczosLobes / 2),\n range2Y = ceil(ratioY * this.lanczosLobes / 2),\n cacheLanc = {},\n center = {},\n icenter = {};\n return process(0);\n },\n\n /**\n * bilinearFiltering\n * @param {Object} canvasEl Canvas element to apply filter to\n * @param {Number} oW Original Width\n * @param {Number} oH Original Height\n * @param {Number} dW Destination Width\n * @param {Number} dH Destination Height\n * @returns {ImageData}\n */\n bilinearFiltering: function (options, oW, oH, dW, dH) {\n var a,\n b,\n c,\n d,\n x,\n y,\n i,\n j,\n xDiff,\n yDiff,\n chnl,\n color,\n offset = 0,\n origPix,\n ratioX = this.rcpScaleX,\n ratioY = this.rcpScaleY,\n w4 = 4 * (oW - 1),\n img = options.imageData,\n pixels = img.data,\n destImage = options.ctx.createImageData(dW, dH),\n destPixels = destImage.data;\n\n for (i = 0; i < dH; i++) {\n for (j = 0; j < dW; j++) {\n x = floor(ratioX * j);\n y = floor(ratioY * i);\n xDiff = ratioX * j - x;\n yDiff = ratioY * i - y;\n origPix = 4 * (y * oW + x);\n\n for (chnl = 0; chnl < 4; chnl++) {\n a = pixels[origPix + chnl];\n b = pixels[origPix + 4 + chnl];\n c = pixels[origPix + w4 + chnl];\n d = pixels[origPix + w4 + 4 + chnl];\n color = a * (1 - xDiff) * (1 - yDiff) + b * xDiff * (1 - yDiff) + c * yDiff * (1 - xDiff) + d * xDiff * yDiff;\n destPixels[offset++] = color;\n }\n }\n }\n\n return destImage;\n },\n\n /**\n * hermiteFastResize\n * @param {Object} canvasEl Canvas element to apply filter to\n * @param {Number} oW Original Width\n * @param {Number} oH Original Height\n * @param {Number} dW Destination Width\n * @param {Number} dH Destination Height\n * @returns {ImageData}\n */\n hermiteFastResize: function (options, oW, oH, dW, dH) {\n var ratioW = this.rcpScaleX,\n ratioH = this.rcpScaleY,\n ratioWHalf = ceil(ratioW / 2),\n ratioHHalf = ceil(ratioH / 2),\n img = options.imageData,\n data = img.data,\n img2 = options.ctx.createImageData(dW, dH),\n data2 = img2.data;\n\n for (var j = 0; j < dH; j++) {\n for (var i = 0; i < dW; i++) {\n var x2 = (i + j * dW) * 4,\n weight = 0,\n weights = 0,\n weightsAlpha = 0,\n gxR = 0,\n gxG = 0,\n gxB = 0,\n gxA = 0,\n centerY = (j + 0.5) * ratioH;\n\n for (var yy = floor(j * ratioH); yy < (j + 1) * ratioH; yy++) {\n var dy = abs(centerY - (yy + 0.5)) / ratioHHalf,\n centerX = (i + 0.5) * ratioW,\n w0 = dy * dy;\n\n for (var xx = floor(i * ratioW); xx < (i + 1) * ratioW; xx++) {\n var dx = abs(centerX - (xx + 0.5)) / ratioWHalf,\n w = sqrt(w0 + dx * dx);\n /* eslint-disable max-depth */\n\n if (w > 1 && w < -1) {\n continue;\n } //hermite filter\n\n\n weight = 2 * w * w * w - 3 * w * w + 1;\n\n if (weight > 0) {\n dx = 4 * (xx + yy * oW); //alpha\n\n gxA += weight * data[dx + 3];\n weightsAlpha += weight; //colors\n\n if (data[dx + 3] < 255) {\n weight = weight * data[dx + 3] / 250;\n }\n\n gxR += weight * data[dx];\n gxG += weight * data[dx + 1];\n gxB += weight * data[dx + 2];\n weights += weight;\n }\n /* eslint-enable max-depth */\n\n }\n }\n\n data2[x2] = gxR / weights;\n data2[x2 + 1] = gxG / weights;\n data2[x2 + 2] = gxB / weights;\n data2[x2 + 3] = gxA / weightsAlpha;\n }\n }\n\n return img2;\n },\n\n /**\n * Returns object representation of an instance\n * @return {Object} Object representation of an instance\n */\n toObject: function () {\n return {\n type: this.type,\n scaleX: this.scaleX,\n scaleY: this.scaleY,\n resizeType: this.resizeType,\n lanczosLobes: this.lanczosLobes\n };\n }\n });\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {Function} [callback] to be invoked after filter creation\n * @return {fabric.Image.filters.Resize} Instance of fabric.Image.filters.Resize\n */\n\n fabric.Image.filters.Resize.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n /**\n * Contrast filter class\n * @class fabric.Image.filters.Contrast\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link fabric.Image.filters.Contrast#initialize} for constructor definition\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @example\n * var filter = new fabric.Image.filters.Contrast({\n * contrast: 0.25\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n */\n\n filters.Contrast = createClass(filters.BaseFilter,\n /** @lends fabric.Image.filters.Contrast.prototype */\n {\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'Contrast',\n fragmentSource: 'precision highp float;\\n' + 'uniform sampler2D uTexture;\\n' + 'uniform float uContrast;\\n' + 'varying vec2 vTexCoord;\\n' + 'void main() {\\n' + 'vec4 color = texture2D(uTexture, vTexCoord);\\n' + 'float contrastF = 1.015 * (uContrast + 1.0) / (1.0 * (1.015 - uContrast));\\n' + 'color.rgb = contrastF * (color.rgb - 0.5) + 0.5;\\n' + 'gl_FragColor = color;\\n' + '}',\n\n /**\n * contrast value, range from -1 to 1.\n * @param {Number} contrast\n * @default 0\n */\n contrast: 0,\n mainParameter: 'contrast',\n\n /**\n * Constructor\n * @memberOf fabric.Image.filters.Contrast.prototype\n * @param {Object} [options] Options object\n * @param {Number} [options.contrast=0] Value to contrast the image up (-1...1)\n */\n\n /**\n * Apply the Contrast operation to a Uint8Array representing the pixels of an image.\n *\n * @param {Object} options\n * @param {ImageData} options.imageData The Uint8Array to be filtered.\n */\n applyTo2d: function (options) {\n if (this.contrast === 0) {\n return;\n }\n\n var imageData = options.imageData,\n i,\n len,\n data = imageData.data,\n len = data.length,\n contrast = Math.floor(this.contrast * 255),\n contrastF = 259 * (contrast + 255) / (255 * (259 - contrast));\n\n for (i = 0; i < len; i += 4) {\n data[i] = contrastF * (data[i] - 128) + 128;\n data[i + 1] = contrastF * (data[i + 1] - 128) + 128;\n data[i + 2] = contrastF * (data[i + 2] - 128) + 128;\n }\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function (gl, program) {\n return {\n uContrast: gl.getUniformLocation(program, 'uContrast')\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function (gl, uniformLocations) {\n gl.uniform1f(uniformLocations.uContrast, this.contrast);\n }\n });\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] to be invoked after filter creation\n * @return {fabric.Image.filters.Contrast} Instance of fabric.Image.filters.Contrast\n */\n\n fabric.Image.filters.Contrast.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n /**\n * Saturate filter class\n * @class fabric.Image.filters.Saturation\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link fabric.Image.filters.Saturation#initialize} for constructor definition\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @example\n * var filter = new fabric.Image.filters.Saturation({\n * saturation: 100\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n */\n\n filters.Saturation = createClass(filters.BaseFilter,\n /** @lends fabric.Image.filters.Saturation.prototype */\n {\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'Saturation',\n fragmentSource: 'precision highp float;\\n' + 'uniform sampler2D uTexture;\\n' + 'uniform float uSaturation;\\n' + 'varying vec2 vTexCoord;\\n' + 'void main() {\\n' + 'vec4 color = texture2D(uTexture, vTexCoord);\\n' + 'float rgMax = max(color.r, color.g);\\n' + 'float rgbMax = max(rgMax, color.b);\\n' + 'color.r += rgbMax != color.r ? (rgbMax - color.r) * uSaturation : 0.00;\\n' + 'color.g += rgbMax != color.g ? (rgbMax - color.g) * uSaturation : 0.00;\\n' + 'color.b += rgbMax != color.b ? (rgbMax - color.b) * uSaturation : 0.00;\\n' + 'gl_FragColor = color;\\n' + '}',\n saturation: 0,\n mainParameter: 'saturation',\n\n /**\n * Constructor\n * @memberOf fabric.Image.filters.Saturate.prototype\n * @param {Object} [options] Options object\n * @param {Number} [options.saturate=0] Value to saturate the image (-1...1)\n */\n\n /**\n * Apply the Saturation operation to a Uint8ClampedArray representing the pixels of an image.\n *\n * @param {Object} options\n * @param {ImageData} options.imageData The Uint8ClampedArray to be filtered.\n */\n applyTo2d: function (options) {\n if (this.saturation === 0) {\n return;\n }\n\n var imageData = options.imageData,\n data = imageData.data,\n len = data.length,\n adjust = -this.saturation,\n i,\n max;\n\n for (i = 0; i < len; i += 4) {\n max = Math.max(data[i], data[i + 1], data[i + 2]);\n data[i] += max !== data[i] ? (max - data[i]) * adjust : 0;\n data[i + 1] += max !== data[i + 1] ? (max - data[i + 1]) * adjust : 0;\n data[i + 2] += max !== data[i + 2] ? (max - data[i + 2]) * adjust : 0;\n }\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function (gl, program) {\n return {\n uSaturation: gl.getUniformLocation(program, 'uSaturation')\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function (gl, uniformLocations) {\n gl.uniform1f(uniformLocations.uSaturation, -this.saturation);\n }\n });\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {Function} [callback] to be invoked after filter creation\n * @return {fabric.Image.filters.Saturation} Instance of fabric.Image.filters.Saturate\n */\n\n fabric.Image.filters.Saturation.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n /**\n * Blur filter class\n * @class fabric.Image.filters.Blur\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link fabric.Image.filters.Blur#initialize} for constructor definition\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @example\n * var filter = new fabric.Image.filters.Blur({\n * blur: 0.5\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n * canvas.renderAll();\n */\n\n filters.Blur = createClass(filters.BaseFilter,\n /** @lends fabric.Image.filters.Blur.prototype */\n {\n type: 'Blur',\n\n /*\n 'gl_FragColor = vec4(0.0);',\n 'gl_FragColor += texture2D(texture, vTexCoord + -7 * uDelta)*0.0044299121055113265;',\n 'gl_FragColor += texture2D(texture, vTexCoord + -6 * uDelta)*0.00895781211794;',\n 'gl_FragColor += texture2D(texture, vTexCoord + -5 * uDelta)*0.0215963866053;',\n 'gl_FragColor += texture2D(texture, vTexCoord + -4 * uDelta)*0.0443683338718;',\n 'gl_FragColor += texture2D(texture, vTexCoord + -3 * uDelta)*0.0776744219933;',\n 'gl_FragColor += texture2D(texture, vTexCoord + -2 * uDelta)*0.115876621105;',\n 'gl_FragColor += texture2D(texture, vTexCoord + -1 * uDelta)*0.147308056121;',\n 'gl_FragColor += texture2D(texture, vTexCoord )*0.159576912161;',\n 'gl_FragColor += texture2D(texture, vTexCoord + 1 * uDelta)*0.147308056121;',\n 'gl_FragColor += texture2D(texture, vTexCoord + 2 * uDelta)*0.115876621105;',\n 'gl_FragColor += texture2D(texture, vTexCoord + 3 * uDelta)*0.0776744219933;',\n 'gl_FragColor += texture2D(texture, vTexCoord + 4 * uDelta)*0.0443683338718;',\n 'gl_FragColor += texture2D(texture, vTexCoord + 5 * uDelta)*0.0215963866053;',\n 'gl_FragColor += texture2D(texture, vTexCoord + 6 * uDelta)*0.00895781211794;',\n 'gl_FragColor += texture2D(texture, vTexCoord + 7 * uDelta)*0.0044299121055113265;',\n */\n\n /* eslint-disable max-len */\n fragmentSource: 'precision highp float;\\n' + 'uniform sampler2D uTexture;\\n' + 'uniform vec2 uDelta;\\n' + 'varying vec2 vTexCoord;\\n' + 'const float nSamples = 15.0;\\n' + 'vec3 v3offset = vec3(12.9898, 78.233, 151.7182);\\n' + 'float random(vec3 scale) {\\n' +\n /* use the fragment position for a different seed per-pixel */\n 'return fract(sin(dot(gl_FragCoord.xyz, scale)) * 43758.5453);\\n' + '}\\n' + 'void main() {\\n' + 'vec4 color = vec4(0.0);\\n' + 'float total = 0.0;\\n' + 'float offset = random(v3offset);\\n' + 'for (float t = -nSamples; t <= nSamples; t++) {\\n' + 'float percent = (t + offset - 0.5) / nSamples;\\n' + 'float weight = 1.0 - abs(percent);\\n' + 'color += texture2D(uTexture, vTexCoord + uDelta * percent) * weight;\\n' + 'total += weight;\\n' + '}\\n' + 'gl_FragColor = color / total;\\n' + '}',\n\n /* eslint-enable max-len */\n\n /**\n * blur value, in percentage of image dimensions.\n * specific to keep the image blur constant at different resolutions\n * range bewteen 0 and 1.\n */\n blur: 0,\n mainParameter: 'blur',\n applyTo: function (options) {\n if (options.webgl) {\n // this aspectRatio is used to give the same blur to vertical and horizontal\n this.aspectRatio = options.sourceWidth / options.sourceHeight;\n options.passes++;\n\n this._setupFrameBuffer(options);\n\n this.horizontal = true;\n this.applyToWebGL(options);\n\n this._swapTextures(options);\n\n this._setupFrameBuffer(options);\n\n this.horizontal = false;\n this.applyToWebGL(options);\n\n this._swapTextures(options);\n } else {\n this.applyTo2d(options);\n }\n },\n applyTo2d: function (options) {\n // paint canvasEl with current image data.\n //options.ctx.putImageData(options.imageData, 0, 0);\n options.imageData = this.simpleBlur(options);\n },\n simpleBlur: function (options) {\n var resources = options.filterBackend.resources,\n canvas1,\n canvas2,\n width = options.imageData.width,\n height = options.imageData.height;\n\n if (!resources.blurLayer1) {\n resources.blurLayer1 = fabric.util.createCanvasElement();\n resources.blurLayer2 = fabric.util.createCanvasElement();\n }\n\n canvas1 = resources.blurLayer1;\n canvas2 = resources.blurLayer2;\n\n if (canvas1.width !== width || canvas1.height !== height) {\n canvas2.width = canvas1.width = width;\n canvas2.height = canvas1.height = height;\n }\n\n var ctx1 = canvas1.getContext('2d'),\n ctx2 = canvas2.getContext('2d'),\n nSamples = 15,\n random,\n percent,\n j,\n i,\n blur = this.blur * 0.06 * 0.5; // load first canvas\n\n ctx1.putImageData(options.imageData, 0, 0);\n ctx2.clearRect(0, 0, width, height);\n\n for (i = -nSamples; i <= nSamples; i++) {\n random = (Math.random() - 0.5) / 4;\n percent = i / nSamples;\n j = blur * percent * width + random;\n ctx2.globalAlpha = 1 - Math.abs(percent);\n ctx2.drawImage(canvas1, j, random);\n ctx1.drawImage(canvas2, 0, 0);\n ctx2.globalAlpha = 1;\n ctx2.clearRect(0, 0, canvas2.width, canvas2.height);\n }\n\n for (i = -nSamples; i <= nSamples; i++) {\n random = (Math.random() - 0.5) / 4;\n percent = i / nSamples;\n j = blur * percent * height + random;\n ctx2.globalAlpha = 1 - Math.abs(percent);\n ctx2.drawImage(canvas1, random, j);\n ctx1.drawImage(canvas2, 0, 0);\n ctx2.globalAlpha = 1;\n ctx2.clearRect(0, 0, canvas2.width, canvas2.height);\n }\n\n options.ctx.drawImage(canvas1, 0, 0);\n var newImageData = options.ctx.getImageData(0, 0, canvas1.width, canvas1.height);\n ctx1.globalAlpha = 1;\n ctx1.clearRect(0, 0, canvas1.width, canvas1.height);\n return newImageData;\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function (gl, program) {\n return {\n delta: gl.getUniformLocation(program, 'uDelta')\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function (gl, uniformLocations) {\n var delta = this.chooseRightDelta();\n gl.uniform2fv(uniformLocations.delta, delta);\n },\n\n /**\n * choose right value of image percentage to blur with\n * @returns {Array} a numeric array with delta values\n */\n chooseRightDelta: function () {\n var blurScale = 1,\n delta = [0, 0],\n blur;\n\n if (this.horizontal) {\n if (this.aspectRatio > 1) {\n // image is wide, i want to shrink radius horizontal\n blurScale = 1 / this.aspectRatio;\n }\n } else {\n if (this.aspectRatio < 1) {\n // image is tall, i want to shrink radius vertical\n blurScale = this.aspectRatio;\n }\n }\n\n blur = blurScale * this.blur * 0.12;\n\n if (this.horizontal) {\n delta[0] = blur;\n } else {\n delta[1] = blur;\n }\n\n return delta;\n }\n });\n /**\n * Deserialize a JSON definition of a BlurFilter into a concrete instance.\n */\n\n filters.Blur.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n /**\n * Gamma filter class\n * @class fabric.Image.filters.Gamma\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link fabric.Image.filters.Gamma#initialize} for constructor definition\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @example\n * var filter = new fabric.Image.filters.Gamma({\n * gamma: [1, 0.5, 2.1]\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n */\n\n filters.Gamma = createClass(filters.BaseFilter,\n /** @lends fabric.Image.filters.Gamma.prototype */\n {\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'Gamma',\n fragmentSource: 'precision highp float;\\n' + 'uniform sampler2D uTexture;\\n' + 'uniform vec3 uGamma;\\n' + 'varying vec2 vTexCoord;\\n' + 'void main() {\\n' + 'vec4 color = texture2D(uTexture, vTexCoord);\\n' + 'vec3 correction = (1.0 / uGamma);\\n' + 'color.r = pow(color.r, correction.r);\\n' + 'color.g = pow(color.g, correction.g);\\n' + 'color.b = pow(color.b, correction.b);\\n' + 'gl_FragColor = color;\\n' + 'gl_FragColor.rgb *= color.a;\\n' + '}',\n\n /**\n * Gamma array value, from 0.01 to 2.2.\n * @param {Array} gamma\n * @default\n */\n gamma: [1, 1, 1],\n\n /**\n * Describe the property that is the filter parameter\n * @param {String} m\n * @default\n */\n mainParameter: 'gamma',\n\n /**\n * Constructor\n * @param {Object} [options] Options object\n */\n initialize: function (options) {\n this.gamma = [1, 1, 1];\n filters.BaseFilter.prototype.initialize.call(this, options);\n },\n\n /**\n * Apply the Gamma operation to a Uint8Array representing the pixels of an image.\n *\n * @param {Object} options\n * @param {ImageData} options.imageData The Uint8Array to be filtered.\n */\n applyTo2d: function (options) {\n var imageData = options.imageData,\n data = imageData.data,\n gamma = this.gamma,\n len = data.length,\n rInv = 1 / gamma[0],\n gInv = 1 / gamma[1],\n bInv = 1 / gamma[2],\n i;\n\n if (!this.rVals) {\n // eslint-disable-next-line\n this.rVals = new Uint8Array(256); // eslint-disable-next-line\n\n this.gVals = new Uint8Array(256); // eslint-disable-next-line\n\n this.bVals = new Uint8Array(256);\n } // This is an optimization - pre-compute a look-up table for each color channel\n // instead of performing these pow calls for each pixel in the image.\n\n\n for (i = 0, len = 256; i < len; i++) {\n this.rVals[i] = Math.pow(i / 255, rInv) * 255;\n this.gVals[i] = Math.pow(i / 255, gInv) * 255;\n this.bVals[i] = Math.pow(i / 255, bInv) * 255;\n }\n\n for (i = 0, len = data.length; i < len; i += 4) {\n data[i] = this.rVals[data[i]];\n data[i + 1] = this.gVals[data[i + 1]];\n data[i + 2] = this.bVals[data[i + 2]];\n }\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function (gl, program) {\n return {\n uGamma: gl.getUniformLocation(program, 'uGamma')\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function (gl, uniformLocations) {\n gl.uniform3fv(uniformLocations.uGamma, this.gamma);\n }\n });\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] to be invoked after filter creation\n * @return {fabric.Image.filters.Gamma} Instance of fabric.Image.filters.Gamma\n */\n\n fabric.Image.filters.Gamma.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n /**\n * A container class that knows how to apply a sequence of filters to an input image.\n */\n\n filters.Composed = createClass(filters.BaseFilter,\n /** @lends fabric.Image.filters.Composed.prototype */\n {\n type: 'Composed',\n\n /**\n * A non sparse array of filters to apply\n */\n subFilters: [],\n\n /**\n * Constructor\n * @param {Object} [options] Options object\n */\n initialize: function (options) {\n this.callSuper('initialize', options); // create a new array instead mutating the prototype with push\n\n this.subFilters = this.subFilters.slice(0);\n },\n\n /**\n * Apply this container's filters to the input image provided.\n *\n * @param {Object} options\n * @param {Number} options.passes The number of filters remaining to be applied.\n */\n applyTo: function (options) {\n options.passes += this.subFilters.length - 1;\n this.subFilters.forEach(function (filter) {\n filter.applyTo(options);\n });\n },\n\n /**\n * Serialize this filter into JSON.\n *\n * @returns {Object} A JSON representation of this filter.\n */\n toObject: function () {\n return fabric.util.object.extend(this.callSuper('toObject'), {\n subFilters: this.subFilters.map(function (filter) {\n return filter.toObject();\n })\n });\n },\n isNeutralState: function () {\n return !this.subFilters.some(function (filter) {\n return !filter.isNeutralState();\n });\n }\n });\n /**\n * Deserialize a JSON definition of a ComposedFilter into a concrete instance.\n */\n\n fabric.Image.filters.Composed.fromObject = function (object, callback) {\n var filters = object.subFilters || [],\n subFilters = filters.map(function (filter) {\n return new fabric.Image.filters[filter.type](filter);\n }),\n instance = new fabric.Image.filters.Composed({\n subFilters: subFilters\n });\n callback && callback(instance);\n return instance;\n };\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n /**\n * HueRotation filter class\n * @class fabric.Image.filters.HueRotation\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link fabric.Image.filters.HueRotation#initialize} for constructor definition\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @example\n * var filter = new fabric.Image.filters.HueRotation({\n * rotation: -0.5\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n */\n\n filters.HueRotation = createClass(filters.ColorMatrix,\n /** @lends fabric.Image.filters.HueRotation.prototype */\n {\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'HueRotation',\n\n /**\n * HueRotation value, from -1 to 1.\n * the unit is radians\n * @param {Number} myParameter\n * @default\n */\n rotation: 0,\n\n /**\n * Describe the property that is the filter parameter\n * @param {String} m\n * @default\n */\n mainParameter: 'rotation',\n calculateMatrix: function () {\n var rad = this.rotation * Math.PI,\n cos = fabric.util.cos(rad),\n sin = fabric.util.sin(rad),\n aThird = 1 / 3,\n aThirdSqtSin = Math.sqrt(aThird) * sin,\n OneMinusCos = 1 - cos;\n this.matrix = [1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0];\n this.matrix[0] = cos + OneMinusCos / 3;\n this.matrix[1] = aThird * OneMinusCos - aThirdSqtSin;\n this.matrix[2] = aThird * OneMinusCos + aThirdSqtSin;\n this.matrix[5] = aThird * OneMinusCos + aThirdSqtSin;\n this.matrix[6] = cos + aThird * OneMinusCos;\n this.matrix[7] = aThird * OneMinusCos - aThirdSqtSin;\n this.matrix[10] = aThird * OneMinusCos - aThirdSqtSin;\n this.matrix[11] = aThird * OneMinusCos + aThirdSqtSin;\n this.matrix[12] = cos + aThird * OneMinusCos;\n },\n\n /**\n * HueRotation isNeutralState implementation\n * Used only in image applyFilters to discard filters that will not have an effect\n * on the image\n * @param {Object} options\n **/\n isNeutralState: function (options) {\n this.calculateMatrix();\n return filters.BaseFilter.prototype.isNeutralState.call(this, options);\n },\n\n /**\n * Apply this filter to the input image data provided.\n *\n * Determines whether to use WebGL or Canvas2D based on the options.webgl flag.\n *\n * @param {Object} options\n * @param {Number} options.passes The number of filters remaining to be executed\n * @param {Boolean} options.webgl Whether to use webgl to render the filter.\n * @param {WebGLTexture} options.sourceTexture The texture setup as the source to be filtered.\n * @param {WebGLTexture} options.targetTexture The texture where filtered output should be drawn.\n * @param {WebGLRenderingContext} options.context The GL context used for rendering.\n * @param {Object} options.programCache A map of compiled shader programs, keyed by filter type.\n */\n applyTo: function (options) {\n this.calculateMatrix();\n filters.BaseFilter.prototype.applyTo.call(this, options);\n }\n });\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] to be invoked after filter creation\n * @return {fabric.Image.filters.HueRotation} Instance of fabric.Image.filters.HueRotation\n */\n\n fabric.Image.filters.HueRotation.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {}),\n clone = fabric.util.object.clone;\n\n if (fabric.Text) {\n fabric.warn('fabric.Text is already defined');\n return;\n }\n /**\n * Text class\n * @class fabric.Text\n * @extends fabric.Object\n * @return {fabric.Text} thisArg\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-2#text}\n * @see {@link fabric.Text#initialize} for constructor definition\n */\n\n\n fabric.Text = fabric.util.createClass(fabric.Object,\n /** @lends fabric.Text.prototype */\n {\n /**\n * Properties which when set cause object to change dimensions\n * @type Array\n * @private\n */\n _dimensionAffectingProps: ['fontSize', 'fontWeight', 'fontFamily', 'fontStyle', 'lineHeight', 'text', 'charSpacing', 'textAlign', 'styles'],\n\n /**\n * @private\n */\n _reNewline: /\\r?\\n/,\n\n /**\n * Use this regular expression to filter for whitespaces that is not a new line.\n * Mostly used when text is 'justify' aligned.\n * @private\n */\n _reSpacesAndTabs: /[ \\t\\r]/g,\n\n /**\n * Use this regular expression to filter for whitespace that is not a new line.\n * Mostly used when text is 'justify' aligned.\n * @private\n */\n _reSpaceAndTab: /[ \\t\\r]/,\n\n /**\n * Use this regular expression to filter consecutive groups of non spaces.\n * Mostly used when text is 'justify' aligned.\n * @private\n */\n _reWords: /\\S+/g,\n\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'text',\n\n /**\n * Font size (in pixels)\n * @type Number\n * @default\n */\n fontSize: 40,\n\n /**\n * Font weight (e.g. bold, normal, 400, 600, 800)\n * @type {(Number|String)}\n * @default\n */\n fontWeight: 'normal',\n\n /**\n * Font family\n * @type String\n * @default\n */\n fontFamily: 'Times New Roman',\n\n /**\n * Text decoration underline.\n * @type Boolean\n * @default\n */\n underline: false,\n\n /**\n * Text decoration overline.\n * @type Boolean\n * @default\n */\n overline: false,\n\n /**\n * Text decoration linethrough.\n * @type Boolean\n * @default\n */\n linethrough: false,\n\n /**\n * Text alignment. Possible values: \"left\", \"center\", \"right\", \"justify\",\n * \"justify-left\", \"justify-center\" or \"justify-right\".\n * @type String\n * @default\n */\n textAlign: 'left',\n\n /**\n * Font style . Possible values: \"\", \"normal\", \"italic\" or \"oblique\".\n * @type String\n * @default\n */\n fontStyle: 'normal',\n\n /**\n * Line height\n * @type Number\n * @default\n */\n lineHeight: 1.16,\n\n /**\n * Superscript schema object (minimum overlap)\n * @type {Object}\n * @default\n */\n superscript: {\n size: 0.60,\n // fontSize factor\n baseline: -0.35 // baseline-shift factor (upwards)\n\n },\n\n /**\n * Subscript schema object (minimum overlap)\n * @type {Object}\n * @default\n */\n subscript: {\n size: 0.60,\n // fontSize factor\n baseline: 0.11 // baseline-shift factor (downwards)\n\n },\n\n /**\n * Background color of text lines\n * @type String\n * @default\n */\n textBackgroundColor: '',\n\n /**\n * List of properties to consider when checking if\n * state of an object is changed ({@link fabric.Object#hasStateChanged})\n * as well as for history (undo/redo) purposes\n * @type Array\n */\n stateProperties: fabric.Object.prototype.stateProperties.concat('fontFamily', 'fontWeight', 'fontSize', 'text', 'underline', 'overline', 'linethrough', 'textAlign', 'fontStyle', 'lineHeight', 'textBackgroundColor', 'charSpacing', 'styles'),\n\n /**\n * List of properties to consider when checking if cache needs refresh\n * @type Array\n */\n cacheProperties: fabric.Object.prototype.cacheProperties.concat('fontFamily', 'fontWeight', 'fontSize', 'text', 'underline', 'overline', 'linethrough', 'textAlign', 'fontStyle', 'lineHeight', 'textBackgroundColor', 'charSpacing', 'styles'),\n\n /**\n * When defined, an object is rendered via stroke and this property specifies its color.\n * <b>Backwards incompatibility note:</b> This property was named \"strokeStyle\" until v1.1.6\n * @type String\n * @default\n */\n stroke: null,\n\n /**\n * Shadow object representing shadow of this shape.\n * <b>Backwards incompatibility note:</b> This property was named \"textShadow\" (String) until v1.2.11\n * @type fabric.Shadow\n * @default\n */\n shadow: null,\n\n /**\n * @private\n */\n _fontSizeFraction: 0.222,\n\n /**\n * @private\n */\n offsets: {\n underline: 0.10,\n linethrough: -0.315,\n overline: -0.88\n },\n\n /**\n * Text Line proportion to font Size (in pixels)\n * @type Number\n * @default\n */\n _fontSizeMult: 1.13,\n\n /**\n * additional space between characters\n * expressed in thousands of em unit\n * @type Number\n * @default\n */\n charSpacing: 0,\n\n /**\n * Object containing character styles - top-level properties -> line numbers,\n * 2nd-level properties - charater numbers\n * @type Object\n * @default\n */\n styles: null,\n\n /**\n * Reference to a context to measure text char or couple of chars\n * the cacheContext of the canvas will be used or a freshly created one if the object is not on canvas\n * once created it will be referenced on fabric._measuringContext to avoide creating a canvas for every\n * text object created.\n * @type {CanvasRenderingContext2D}\n * @default\n */\n _measuringContext: null,\n\n /**\n * Baseline shift, stlyes only, keep at 0 for the main text object\n * @type {Number}\n * @default\n */\n deltaY: 0,\n\n /**\n * Array of properties that define a style unit (of 'styles').\n * @type {Array}\n * @default\n */\n _styleProperties: ['stroke', 'strokeWidth', 'fill', 'fontFamily', 'fontSize', 'fontWeight', 'fontStyle', 'underline', 'overline', 'linethrough', 'deltaY', 'textBackgroundColor'],\n\n /**\n * contains characters bounding boxes\n */\n __charBounds: [],\n\n /**\n * use this size when measuring text. To avoid IE11 rounding errors\n * @type {Number}\n * @default\n * @readonly\n * @private\n */\n CACHE_FONT_SIZE: 400,\n\n /**\n * contains the min text width to avoid getting 0\n * @type {Number}\n * @default\n */\n MIN_TEXT_WIDTH: 2,\n\n /**\n * Constructor\n * @param {String} text Text string\n * @param {Object} [options] Options object\n * @return {fabric.Text} thisArg\n */\n initialize: function (text, options) {\n this.styles = options ? options.styles || {} : {};\n this.text = text;\n this.__skipDimension = true;\n this.callSuper('initialize', options);\n this.__skipDimension = false;\n this.initDimensions();\n this.setCoords();\n this.setupState({\n propertySet: '_dimensionAffectingProps'\n });\n },\n\n /**\n * Return a contex for measurement of text string.\n * if created it gets stored for reuse\n * @param {String} text Text string\n * @param {Object} [options] Options object\n * @return {fabric.Text} thisArg\n */\n getMeasuringContext: function () {\n // if we did not return we have to measure something.\n if (!fabric._measuringContext) {\n fabric._measuringContext = this.canvas && this.canvas.contextCache || fabric.util.createCanvasElement().getContext('2d');\n }\n\n return fabric._measuringContext;\n },\n\n /**\n * @private\n * Divides text into lines of text and lines of graphemes.\n */\n _splitText: function () {\n var newLines = this._splitTextIntoLines(this.text);\n\n this.textLines = newLines.lines;\n this._textLines = newLines.graphemeLines;\n this._unwrappedTextLines = newLines._unwrappedLines;\n this._text = newLines.graphemeText;\n return newLines;\n },\n\n /**\n * Initialize or update text dimensions.\n * Updates this.width and this.height with the proper values.\n * Does not return dimensions.\n */\n initDimensions: function () {\n if (this.__skipDimension) {\n return;\n }\n\n this._splitText();\n\n this._clearCache();\n\n this.width = this.calcTextWidth() || this.cursorWidth || this.MIN_TEXT_WIDTH;\n\n if (this.textAlign.indexOf('justify') !== -1) {\n // once text is measured we need to make space fatter to make justified text.\n this.enlargeSpaces();\n }\n\n this.height = this.calcTextHeight();\n this.saveState({\n propertySet: '_dimensionAffectingProps'\n });\n },\n\n /**\n * Enlarge space boxes and shift the others\n */\n enlargeSpaces: function () {\n var diffSpace, currentLineWidth, numberOfSpaces, accumulatedSpace, line, charBound, spaces;\n\n for (var i = 0, len = this._textLines.length; i < len; i++) {\n if (this.textAlign !== 'justify' && (i === len - 1 || this.isEndOfWrapping(i))) {\n continue;\n }\n\n accumulatedSpace = 0;\n line = this._textLines[i];\n currentLineWidth = this.getLineWidth(i);\n\n if (currentLineWidth < this.width && (spaces = this.textLines[i].match(this._reSpacesAndTabs))) {\n numberOfSpaces = spaces.length;\n diffSpace = (this.width - currentLineWidth) / numberOfSpaces;\n\n for (var j = 0, jlen = line.length; j <= jlen; j++) {\n charBound = this.__charBounds[i][j];\n\n if (this._reSpaceAndTab.test(line[j])) {\n charBound.width += diffSpace;\n charBound.kernedWidth += diffSpace;\n charBound.left += accumulatedSpace;\n accumulatedSpace += diffSpace;\n } else {\n charBound.left += accumulatedSpace;\n }\n }\n }\n }\n },\n\n /**\n * Detect if the text line is ended with an hard break\n * text and itext do not have wrapping, return false\n * @return {Boolean}\n */\n isEndOfWrapping: function (lineIndex) {\n return lineIndex === this._textLines.length - 1;\n },\n\n /**\n * Detect if a line has a linebreak and so we need to account for it when moving\n * and counting style.\n * It return always for text and Itext.\n * @return Number\n */\n missingNewlineOffset: function () {\n return 1;\n },\n\n /**\n * Returns string representation of an instance\n * @return {String} String representation of text object\n */\n toString: function () {\n return '#<fabric.Text (' + this.complexity() + '): { \"text\": \"' + this.text + '\", \"fontFamily\": \"' + this.fontFamily + '\" }>';\n },\n\n /**\n * Return the dimension and the zoom level needed to create a cache canvas\n * big enough to host the object to be cached.\n * @private\n * @param {Object} dim.x width of object to be cached\n * @param {Object} dim.y height of object to be cached\n * @return {Object}.width width of canvas\n * @return {Object}.height height of canvas\n * @return {Object}.zoomX zoomX zoom value to unscale the canvas before drawing cache\n * @return {Object}.zoomY zoomY zoom value to unscale the canvas before drawing cache\n */\n _getCacheCanvasDimensions: function () {\n var dims = this.callSuper('_getCacheCanvasDimensions');\n var fontSize = this.fontSize;\n dims.width += fontSize * dims.zoomX;\n dims.height += fontSize * dims.zoomY;\n return dims;\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _render: function (ctx) {\n this._setTextStyles(ctx);\n\n this._renderTextLinesBackground(ctx);\n\n this._renderTextDecoration(ctx, 'underline');\n\n this._renderText(ctx);\n\n this._renderTextDecoration(ctx, 'overline');\n\n this._renderTextDecoration(ctx, 'linethrough');\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderText: function (ctx) {\n if (this.paintFirst === 'stroke') {\n this._renderTextStroke(ctx);\n\n this._renderTextFill(ctx);\n } else {\n this._renderTextFill(ctx);\n\n this._renderTextStroke(ctx);\n }\n },\n\n /**\n * Set the font parameter of the context with the object properties or with charStyle\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n * @param {Object} [charStyle] object with font style properties\n * @param {String} [charStyle.fontFamily] Font Family\n * @param {Number} [charStyle.fontSize] Font size in pixels. ( without px suffix )\n * @param {String} [charStyle.fontWeight] Font weight\n * @param {String} [charStyle.fontStyle] Font style (italic|normal)\n */\n _setTextStyles: function (ctx, charStyle, forMeasuring) {\n ctx.textBaseline = 'alphabetic';\n ctx.font = this._getFontDeclaration(charStyle, forMeasuring);\n },\n\n /**\n * calculate and return the text Width measuring each line.\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n * @return {Number} Maximum width of fabric.Text object\n */\n calcTextWidth: function () {\n var maxWidth = this.getLineWidth(0);\n\n for (var i = 1, len = this._textLines.length; i < len; i++) {\n var currentLineWidth = this.getLineWidth(i);\n\n if (currentLineWidth > maxWidth) {\n maxWidth = currentLineWidth;\n }\n }\n\n return maxWidth;\n },\n\n /**\n * @private\n * @param {String} method Method name (\"fillText\" or \"strokeText\")\n * @param {CanvasRenderingContext2D} ctx Context to render on\n * @param {String} line Text to render\n * @param {Number} left Left position of text\n * @param {Number} top Top position of text\n * @param {Number} lineIndex Index of a line in a text\n */\n _renderTextLine: function (method, ctx, line, left, top, lineIndex) {\n this._renderChars(method, ctx, line, left, top, lineIndex);\n },\n\n /**\n * Renders the text background for lines, taking care of style\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderTextLinesBackground: function (ctx) {\n if (!this.textBackgroundColor && !this.styleHas('textBackgroundColor')) {\n return;\n }\n\n var lineTopOffset = 0,\n heightOfLine,\n lineLeftOffset,\n originalFill = ctx.fillStyle,\n line,\n lastColor,\n leftOffset = this._getLeftOffset(),\n topOffset = this._getTopOffset(),\n boxStart = 0,\n boxWidth = 0,\n charBox,\n currentColor;\n\n for (var i = 0, len = this._textLines.length; i < len; i++) {\n heightOfLine = this.getHeightOfLine(i);\n\n if (!this.textBackgroundColor && !this.styleHas('textBackgroundColor', i)) {\n lineTopOffset += heightOfLine;\n continue;\n }\n\n line = this._textLines[i];\n lineLeftOffset = this._getLineLeftOffset(i);\n boxWidth = 0;\n boxStart = 0;\n lastColor = this.getValueOfPropertyAt(i, 0, 'textBackgroundColor');\n\n for (var j = 0, jlen = line.length; j < jlen; j++) {\n charBox = this.__charBounds[i][j];\n currentColor = this.getValueOfPropertyAt(i, j, 'textBackgroundColor');\n\n if (currentColor !== lastColor) {\n ctx.fillStyle = lastColor;\n lastColor && ctx.fillRect(leftOffset + lineLeftOffset + boxStart, topOffset + lineTopOffset, boxWidth, heightOfLine / this.lineHeight);\n boxStart = charBox.left;\n boxWidth = charBox.width;\n lastColor = currentColor;\n } else {\n boxWidth += charBox.kernedWidth;\n }\n }\n\n if (currentColor) {\n ctx.fillStyle = currentColor;\n ctx.fillRect(leftOffset + lineLeftOffset + boxStart, topOffset + lineTopOffset, boxWidth, heightOfLine / this.lineHeight);\n }\n\n lineTopOffset += heightOfLine;\n }\n\n ctx.fillStyle = originalFill; // if there is text background color no\n // other shadows should be casted\n\n this._removeShadow(ctx);\n },\n\n /**\n * @private\n * @param {Object} decl style declaration for cache\n * @param {String} decl.fontFamily fontFamily\n * @param {String} decl.fontStyle fontStyle\n * @param {String} decl.fontWeight fontWeight\n * @return {Object} reference to cache\n */\n getFontCache: function (decl) {\n var fontFamily = decl.fontFamily.toLowerCase();\n\n if (!fabric.charWidthsCache[fontFamily]) {\n fabric.charWidthsCache[fontFamily] = {};\n }\n\n var cache = fabric.charWidthsCache[fontFamily],\n cacheProp = decl.fontStyle.toLowerCase() + '_' + (decl.fontWeight + '').toLowerCase();\n\n if (!cache[cacheProp]) {\n cache[cacheProp] = {};\n }\n\n return cache[cacheProp];\n },\n\n /**\n * apply all the character style to canvas for rendering\n * @private\n * @param {String} _char\n * @param {Number} lineIndex\n * @param {Number} charIndex\n * @param {Object} [decl]\n */\n _applyCharStyles: function (method, ctx, lineIndex, charIndex, styleDeclaration) {\n this._setFillStyles(ctx, styleDeclaration);\n\n this._setStrokeStyles(ctx, styleDeclaration);\n\n ctx.font = this._getFontDeclaration(styleDeclaration);\n },\n\n /**\n * measure and return the width of a single character.\n * possibly overridden to accommodate different measure logic or\n * to hook some external lib for character measurement\n * @private\n * @param {String} _char, char to be measured\n * @param {Object} charStyle style of char to be measured\n * @param {String} [previousChar] previous char\n * @param {Object} [prevCharStyle] style of previous char\n */\n _measureChar: function (_char, charStyle, previousChar, prevCharStyle) {\n // first i try to return from cache\n var fontCache = this.getFontCache(charStyle),\n fontDeclaration = this._getFontDeclaration(charStyle),\n previousFontDeclaration = this._getFontDeclaration(prevCharStyle),\n couple = previousChar + _char,\n stylesAreEqual = fontDeclaration === previousFontDeclaration,\n width,\n coupleWidth,\n previousWidth,\n fontMultiplier = charStyle.fontSize / this.CACHE_FONT_SIZE,\n kernedWidth;\n\n if (previousChar && fontCache[previousChar] !== undefined) {\n previousWidth = fontCache[previousChar];\n }\n\n if (fontCache[_char] !== undefined) {\n kernedWidth = width = fontCache[_char];\n }\n\n if (stylesAreEqual && fontCache[couple] !== undefined) {\n coupleWidth = fontCache[couple];\n kernedWidth = coupleWidth - previousWidth;\n }\n\n if (width === undefined || previousWidth === undefined || coupleWidth === undefined) {\n var ctx = this.getMeasuringContext(); // send a TRUE to specify measuring font size CACHE_FONT_SIZE\n\n this._setTextStyles(ctx, charStyle, true);\n }\n\n if (width === undefined) {\n kernedWidth = width = ctx.measureText(_char).width;\n fontCache[_char] = width;\n }\n\n if (previousWidth === undefined && stylesAreEqual && previousChar) {\n previousWidth = ctx.measureText(previousChar).width;\n fontCache[previousChar] = previousWidth;\n }\n\n if (stylesAreEqual && coupleWidth === undefined) {\n // we can measure the kerning couple and subtract the width of the previous character\n coupleWidth = ctx.measureText(couple).width;\n fontCache[couple] = coupleWidth;\n kernedWidth = coupleWidth - previousWidth;\n }\n\n return {\n width: width * fontMultiplier,\n kernedWidth: kernedWidth * fontMultiplier\n };\n },\n\n /**\n * Computes height of character at given position\n * @param {Number} line the line index number\n * @param {Number} _char the character index number\n * @return {Number} fontSize of the character\n */\n getHeightOfChar: function (line, _char) {\n return this.getValueOfPropertyAt(line, _char, 'fontSize');\n },\n\n /**\n * measure a text line measuring all characters.\n * @param {Number} lineIndex line number\n * @return {Number} Line width\n */\n measureLine: function (lineIndex) {\n var lineInfo = this._measureLine(lineIndex);\n\n if (this.charSpacing !== 0) {\n lineInfo.width -= this._getWidthOfCharSpacing();\n }\n\n if (lineInfo.width < 0) {\n lineInfo.width = 0;\n }\n\n return lineInfo;\n },\n\n /**\n * measure every grapheme of a line, populating __charBounds\n * @param {Number} lineIndex\n * @return {Object} object.width total width of characters\n * @return {Object} object.widthOfSpaces length of chars that match this._reSpacesAndTabs\n */\n _measureLine: function (lineIndex) {\n var width = 0,\n i,\n grapheme,\n line = this._textLines[lineIndex],\n prevGrapheme,\n graphemeInfo,\n numOfSpaces = 0,\n lineBounds = new Array(line.length);\n this.__charBounds[lineIndex] = lineBounds;\n\n for (i = 0; i < line.length; i++) {\n grapheme = line[i];\n graphemeInfo = this._getGraphemeBox(grapheme, lineIndex, i, prevGrapheme);\n lineBounds[i] = graphemeInfo;\n width += graphemeInfo.kernedWidth;\n prevGrapheme = grapheme;\n } // this latest bound box represent the last character of the line\n // to simplify cursor handling in interactive mode.\n\n\n lineBounds[i] = {\n left: graphemeInfo ? graphemeInfo.left + graphemeInfo.width : 0,\n width: 0,\n kernedWidth: 0,\n height: this.fontSize\n };\n return {\n width: width,\n numOfSpaces: numOfSpaces\n };\n },\n\n /**\n * Measure and return the info of a single grapheme.\n * needs the the info of previous graphemes already filled\n * @private\n * @param {String} grapheme to be measured\n * @param {Number} lineIndex index of the line where the char is\n * @param {Number} charIndex position in the line\n * @param {String} [prevGrapheme] character preceding the one to be measured\n */\n _getGraphemeBox: function (grapheme, lineIndex, charIndex, prevGrapheme, skipLeft) {\n var style = this.getCompleteStyleDeclaration(lineIndex, charIndex),\n prevStyle = prevGrapheme ? this.getCompleteStyleDeclaration(lineIndex, charIndex - 1) : {},\n info = this._measureChar(grapheme, style, prevGrapheme, prevStyle),\n kernedWidth = info.kernedWidth,\n width = info.width,\n charSpacing;\n\n if (this.charSpacing !== 0) {\n charSpacing = this._getWidthOfCharSpacing();\n width += charSpacing;\n kernedWidth += charSpacing;\n }\n\n var box = {\n width: width,\n left: 0,\n height: style.fontSize,\n kernedWidth: kernedWidth,\n deltaY: style.deltaY\n };\n\n if (charIndex > 0 && !skipLeft) {\n var previousBox = this.__charBounds[lineIndex][charIndex - 1];\n box.left = previousBox.left + previousBox.width + info.kernedWidth - info.width;\n }\n\n return box;\n },\n\n /**\n * Calculate height of line at 'lineIndex'\n * @param {Number} lineIndex index of line to calculate\n * @return {Number}\n */\n getHeightOfLine: function (lineIndex) {\n if (this.__lineHeights[lineIndex]) {\n return this.__lineHeights[lineIndex];\n }\n\n var line = this._textLines[lineIndex],\n // char 0 is measured before the line cycle because it nneds to char\n // emptylines\n maxHeight = this.getHeightOfChar(lineIndex, 0);\n\n for (var i = 1, len = line.length; i < len; i++) {\n maxHeight = Math.max(this.getHeightOfChar(lineIndex, i), maxHeight);\n }\n\n return this.__lineHeights[lineIndex] = maxHeight * this.lineHeight * this._fontSizeMult;\n },\n\n /**\n * Calculate text box height\n */\n calcTextHeight: function () {\n var lineHeight,\n height = 0;\n\n for (var i = 0, len = this._textLines.length; i < len; i++) {\n lineHeight = this.getHeightOfLine(i);\n height += i === len - 1 ? lineHeight / this.lineHeight : lineHeight;\n }\n\n return height;\n },\n\n /**\n * @private\n * @return {Number} Left offset\n */\n _getLeftOffset: function () {\n return -this.width / 2;\n },\n\n /**\n * @private\n * @return {Number} Top offset\n */\n _getTopOffset: function () {\n return -this.height / 2;\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n * @param {String} method Method name (\"fillText\" or \"strokeText\")\n */\n _renderTextCommon: function (ctx, method) {\n ctx.save();\n\n var lineHeights = 0,\n left = this._getLeftOffset(),\n top = this._getTopOffset(),\n offsets = this._applyPatternGradientTransform(ctx, method === 'fillText' ? this.fill : this.stroke);\n\n for (var i = 0, len = this._textLines.length; i < len; i++) {\n var heightOfLine = this.getHeightOfLine(i),\n maxHeight = heightOfLine / this.lineHeight,\n leftOffset = this._getLineLeftOffset(i);\n\n this._renderTextLine(method, ctx, this._textLines[i], left + leftOffset - offsets.offsetX, top + lineHeights + maxHeight - offsets.offsetY, i);\n\n lineHeights += heightOfLine;\n }\n\n ctx.restore();\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderTextFill: function (ctx) {\n if (!this.fill && !this.styleHas('fill')) {\n return;\n }\n\n this._renderTextCommon(ctx, 'fillText');\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderTextStroke: function (ctx) {\n if ((!this.stroke || this.strokeWidth === 0) && this.isEmptyStyles()) {\n return;\n }\n\n if (this.shadow && !this.shadow.affectStroke) {\n this._removeShadow(ctx);\n }\n\n ctx.save();\n\n this._setLineDash(ctx, this.strokeDashArray);\n\n ctx.beginPath();\n\n this._renderTextCommon(ctx, 'strokeText');\n\n ctx.closePath();\n ctx.restore();\n },\n\n /**\n * @private\n * @param {String} method fillText or strokeText.\n * @param {CanvasRenderingContext2D} ctx Context to render on\n * @param {Array} line Content of the line, splitted in an array by grapheme\n * @param {Number} left\n * @param {Number} top\n * @param {Number} lineIndex\n */\n _renderChars: function (method, ctx, line, left, top, lineIndex) {\n // set proper line offset\n var lineHeight = this.getHeightOfLine(lineIndex),\n isJustify = this.textAlign.indexOf('justify') !== -1,\n actualStyle,\n nextStyle,\n charsToRender = '',\n charBox,\n boxWidth = 0,\n timeToRender,\n shortCut = !isJustify && this.charSpacing === 0 && this.isEmptyStyles(lineIndex);\n ctx.save();\n top -= lineHeight * this._fontSizeFraction / this.lineHeight;\n\n if (shortCut) {\n // render all the line in one pass without checking\n this._renderChar(method, ctx, lineIndex, 0, line.join(''), left, top, lineHeight);\n\n ctx.restore();\n return;\n }\n\n for (var i = 0, len = line.length - 1; i <= len; i++) {\n timeToRender = i === len || this.charSpacing;\n charsToRender += line[i];\n charBox = this.__charBounds[lineIndex][i];\n\n if (boxWidth === 0) {\n left += charBox.kernedWidth - charBox.width;\n boxWidth += charBox.width;\n } else {\n boxWidth += charBox.kernedWidth;\n }\n\n if (isJustify && !timeToRender) {\n if (this._reSpaceAndTab.test(line[i])) {\n timeToRender = true;\n }\n }\n\n if (!timeToRender) {\n // if we have charSpacing, we render char by char\n actualStyle = actualStyle || this.getCompleteStyleDeclaration(lineIndex, i);\n nextStyle = this.getCompleteStyleDeclaration(lineIndex, i + 1);\n timeToRender = this._hasStyleChanged(actualStyle, nextStyle);\n }\n\n if (timeToRender) {\n this._renderChar(method, ctx, lineIndex, i, charsToRender, left, top, lineHeight);\n\n charsToRender = '';\n actualStyle = nextStyle;\n left += boxWidth;\n boxWidth = 0;\n }\n }\n\n ctx.restore();\n },\n\n /**\n * @private\n * @param {String} method\n * @param {CanvasRenderingContext2D} ctx Context to render on\n * @param {Number} lineIndex\n * @param {Number} charIndex\n * @param {String} _char\n * @param {Number} left Left coordinate\n * @param {Number} top Top coordinate\n * @param {Number} lineHeight Height of the line\n */\n _renderChar: function (method, ctx, lineIndex, charIndex, _char, left, top) {\n var decl = this._getStyleDeclaration(lineIndex, charIndex),\n fullDecl = this.getCompleteStyleDeclaration(lineIndex, charIndex),\n shouldFill = method === 'fillText' && fullDecl.fill,\n shouldStroke = method === 'strokeText' && fullDecl.stroke && fullDecl.strokeWidth;\n\n if (!shouldStroke && !shouldFill) {\n return;\n }\n\n decl && ctx.save();\n\n this._applyCharStyles(method, ctx, lineIndex, charIndex, fullDecl);\n\n if (decl && decl.textBackgroundColor) {\n this._removeShadow(ctx);\n }\n\n if (decl && decl.deltaY) {\n top += decl.deltaY;\n }\n\n shouldFill && ctx.fillText(_char, left, top);\n shouldStroke && ctx.strokeText(_char, left, top);\n decl && ctx.restore();\n },\n\n /**\n * Turns the character into a 'superior figure' (i.e. 'superscript')\n * @param {Number} start selection start\n * @param {Number} end selection end\n * @returns {fabric.Text} thisArg\n * @chainable\n */\n setSuperscript: function (start, end) {\n return this._setScript(start, end, this.superscript);\n },\n\n /**\n * Turns the character into an 'inferior figure' (i.e. 'subscript')\n * @param {Number} start selection start\n * @param {Number} end selection end\n * @returns {fabric.Text} thisArg\n * @chainable\n */\n setSubscript: function (start, end) {\n return this._setScript(start, end, this.subscript);\n },\n\n /**\n * Applies 'schema' at given position\n * @private\n * @param {Number} start selection start\n * @param {Number} end selection end\n * @param {Number} schema\n * @returns {fabric.Text} thisArg\n * @chainable\n */\n _setScript: function (start, end, schema) {\n var loc = this.get2DCursorLocation(start, true),\n fontSize = this.getValueOfPropertyAt(loc.lineIndex, loc.charIndex, 'fontSize'),\n dy = this.getValueOfPropertyAt(loc.lineIndex, loc.charIndex, 'deltaY'),\n style = {\n fontSize: fontSize * schema.size,\n deltaY: dy + fontSize * schema.baseline\n };\n this.setSelectionStyles(style, start, end);\n return this;\n },\n\n /**\n * @private\n * @param {Object} prevStyle\n * @param {Object} thisStyle\n */\n _hasStyleChanged: function (prevStyle, thisStyle) {\n return prevStyle.fill !== thisStyle.fill || prevStyle.stroke !== thisStyle.stroke || prevStyle.strokeWidth !== thisStyle.strokeWidth || prevStyle.fontSize !== thisStyle.fontSize || prevStyle.fontFamily !== thisStyle.fontFamily || prevStyle.fontWeight !== thisStyle.fontWeight || prevStyle.fontStyle !== thisStyle.fontStyle || prevStyle.deltaY !== thisStyle.deltaY;\n },\n\n /**\n * @private\n * @param {Object} prevStyle\n * @param {Object} thisStyle\n */\n _hasStyleChangedForSvg: function (prevStyle, thisStyle) {\n return this._hasStyleChanged(prevStyle, thisStyle) || prevStyle.overline !== thisStyle.overline || prevStyle.underline !== thisStyle.underline || prevStyle.linethrough !== thisStyle.linethrough;\n },\n\n /**\n * @private\n * @param {Number} lineIndex index text line\n * @return {Number} Line left offset\n */\n _getLineLeftOffset: function (lineIndex) {\n var lineWidth = this.getLineWidth(lineIndex);\n\n if (this.textAlign === 'center') {\n return (this.width - lineWidth) / 2;\n }\n\n if (this.textAlign === 'right') {\n return this.width - lineWidth;\n }\n\n if (this.textAlign === 'justify-center' && this.isEndOfWrapping(lineIndex)) {\n return (this.width - lineWidth) / 2;\n }\n\n if (this.textAlign === 'justify-right' && this.isEndOfWrapping(lineIndex)) {\n return this.width - lineWidth;\n }\n\n return 0;\n },\n\n /**\n * @private\n */\n _clearCache: function () {\n this.__lineWidths = [];\n this.__lineHeights = [];\n this.__charBounds = [];\n },\n\n /**\n * @private\n */\n _shouldClearDimensionCache: function () {\n var shouldClear = this._forceClearCache;\n shouldClear || (shouldClear = this.hasStateChanged('_dimensionAffectingProps'));\n\n if (shouldClear) {\n this.dirty = true;\n this._forceClearCache = false;\n }\n\n return shouldClear;\n },\n\n /**\n * Measure a single line given its index. Used to calculate the initial\n * text bounding box. The values are calculated and stored in __lineWidths cache.\n * @private\n * @param {Number} lineIndex line number\n * @return {Number} Line width\n */\n getLineWidth: function (lineIndex) {\n if (this.__lineWidths[lineIndex]) {\n return this.__lineWidths[lineIndex];\n }\n\n var width,\n line = this._textLines[lineIndex],\n lineInfo;\n\n if (line === '') {\n width = 0;\n } else {\n lineInfo = this.measureLine(lineIndex);\n width = lineInfo.width;\n }\n\n this.__lineWidths[lineIndex] = width;\n return width;\n },\n _getWidthOfCharSpacing: function () {\n if (this.charSpacing !== 0) {\n return this.fontSize * this.charSpacing / 1000;\n }\n\n return 0;\n },\n\n /**\n * Retrieves the value of property at given character position\n * @param {Number} lineIndex the line number\n * @param {Number} charIndex the charater number\n * @param {String} property the property name\n * @returns the value of 'property'\n */\n getValueOfPropertyAt: function (lineIndex, charIndex, property) {\n var charStyle = this._getStyleDeclaration(lineIndex, charIndex);\n\n if (charStyle && typeof charStyle[property] !== 'undefined') {\n return charStyle[property];\n }\n\n return this[property];\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderTextDecoration: function (ctx, type) {\n if (!this[type] && !this.styleHas(type)) {\n return;\n }\n\n var heightOfLine,\n size,\n _size,\n lineLeftOffset,\n dy,\n _dy,\n line,\n lastDecoration,\n leftOffset = this._getLeftOffset(),\n topOffset = this._getTopOffset(),\n top,\n boxStart,\n boxWidth,\n charBox,\n currentDecoration,\n maxHeight,\n currentFill,\n lastFill,\n charSpacing = this._getWidthOfCharSpacing();\n\n for (var i = 0, len = this._textLines.length; i < len; i++) {\n heightOfLine = this.getHeightOfLine(i);\n\n if (!this[type] && !this.styleHas(type, i)) {\n topOffset += heightOfLine;\n continue;\n }\n\n line = this._textLines[i];\n maxHeight = heightOfLine / this.lineHeight;\n lineLeftOffset = this._getLineLeftOffset(i);\n boxStart = 0;\n boxWidth = 0;\n lastDecoration = this.getValueOfPropertyAt(i, 0, type);\n lastFill = this.getValueOfPropertyAt(i, 0, 'fill');\n top = topOffset + maxHeight * (1 - this._fontSizeFraction);\n size = this.getHeightOfChar(i, 0);\n dy = this.getValueOfPropertyAt(i, 0, 'deltaY');\n\n for (var j = 0, jlen = line.length; j < jlen; j++) {\n charBox = this.__charBounds[i][j];\n currentDecoration = this.getValueOfPropertyAt(i, j, type);\n currentFill = this.getValueOfPropertyAt(i, j, 'fill');\n _size = this.getHeightOfChar(i, j);\n _dy = this.getValueOfPropertyAt(i, j, 'deltaY');\n\n if ((currentDecoration !== lastDecoration || currentFill !== lastFill || _size !== size || _dy !== dy) && boxWidth > 0) {\n ctx.fillStyle = lastFill;\n lastDecoration && lastFill && ctx.fillRect(leftOffset + lineLeftOffset + boxStart, top + this.offsets[type] * size + dy, boxWidth, this.fontSize / 15);\n boxStart = charBox.left;\n boxWidth = charBox.width;\n lastDecoration = currentDecoration;\n lastFill = currentFill;\n size = _size;\n dy = _dy;\n } else {\n boxWidth += charBox.kernedWidth;\n }\n }\n\n ctx.fillStyle = currentFill;\n currentDecoration && currentFill && ctx.fillRect(leftOffset + lineLeftOffset + boxStart, top + this.offsets[type] * size + dy, boxWidth - charSpacing, this.fontSize / 15);\n topOffset += heightOfLine;\n } // if there is text background color no\n // other shadows should be casted\n\n\n this._removeShadow(ctx);\n },\n\n /**\n * return font declaration string for canvas context\n * @param {Object} [styleObject] object\n * @returns {String} font declaration formatted for canvas context.\n */\n _getFontDeclaration: function (styleObject, forMeasuring) {\n var style = styleObject || this,\n family = this.fontFamily,\n fontIsGeneric = fabric.Text.genericFonts.indexOf(family.toLowerCase()) > -1;\n var fontFamily = family === undefined || family.indexOf('\\'') > -1 || family.indexOf(',') > -1 || family.indexOf('\"') > -1 || fontIsGeneric ? style.fontFamily : '\"' + style.fontFamily + '\"';\n return [// node-canvas needs \"weight style\", while browsers need \"style weight\"\n // verify if this can be fixed in JSDOM\n fabric.isLikelyNode ? style.fontWeight : style.fontStyle, fabric.isLikelyNode ? style.fontStyle : style.fontWeight, forMeasuring ? this.CACHE_FONT_SIZE + 'px' : style.fontSize + 'px', fontFamily].join(' ');\n },\n\n /**\n * Renders text instance on a specified context\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n render: function (ctx) {\n // do not render if object is not visible\n if (!this.visible) {\n return;\n }\n\n if (this.canvas && this.canvas.skipOffscreen && !this.group && !this.isOnScreen()) {\n return;\n }\n\n if (this._shouldClearDimensionCache()) {\n this.initDimensions();\n }\n\n this.callSuper('render', ctx);\n },\n\n /**\n * Returns the text as an array of lines.\n * @param {String} text text to split\n * @returns {Array} Lines in the text\n */\n _splitTextIntoLines: function (text) {\n var lines = text.split(this._reNewline),\n newLines = new Array(lines.length),\n newLine = ['\\n'],\n newText = [];\n\n for (var i = 0; i < lines.length; i++) {\n newLines[i] = fabric.util.string.graphemeSplit(lines[i]);\n newText = newText.concat(newLines[i], newLine);\n }\n\n newText.pop();\n return {\n _unwrappedLines: newLines,\n lines: lines,\n graphemeText: newText,\n graphemeLines: newLines\n };\n },\n\n /**\n * Returns object representation of an instance\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} Object representation of an instance\n */\n toObject: function (propertiesToInclude) {\n var additionalProperties = ['text', 'fontSize', 'fontWeight', 'fontFamily', 'fontStyle', 'lineHeight', 'underline', 'overline', 'linethrough', 'textAlign', 'textBackgroundColor', 'charSpacing'].concat(propertiesToInclude);\n var obj = this.callSuper('toObject', additionalProperties);\n obj.styles = clone(this.styles, true);\n return obj;\n },\n\n /**\n * Sets property to a given value. When changing position/dimension -related properties (left, top, scale, angle, etc.) `set` does not update position of object's borders/controls. If you need to update those, call `setCoords()`.\n * @param {String|Object} key Property name or object (if object, iterate over the object properties)\n * @param {Object|Function} value Property value (if function, the value is passed into it and its return value is used as a new one)\n * @return {fabric.Object} thisArg\n * @chainable\n */\n set: function (key, value) {\n this.callSuper('set', key, value);\n var needsDims = false;\n\n if (typeof key === 'object') {\n for (var _key in key) {\n needsDims = needsDims || this._dimensionAffectingProps.indexOf(_key) !== -1;\n }\n } else {\n needsDims = this._dimensionAffectingProps.indexOf(key) !== -1;\n }\n\n if (needsDims) {\n this.initDimensions();\n this.setCoords();\n }\n\n return this;\n },\n\n /**\n * Returns complexity of an instance\n * @return {Number} complexity\n */\n complexity: function () {\n return 1;\n }\n });\n /* _FROM_SVG_START_ */\n\n /**\n * List of attribute names to account for when parsing SVG element (used by {@link fabric.Text.fromElement})\n * @static\n * @memberOf fabric.Text\n * @see: http://www.w3.org/TR/SVG/text.html#TextElement\n */\n\n fabric.Text.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat('x y dx dy font-family font-style font-weight font-size letter-spacing text-decoration text-anchor'.split(' '));\n /**\n * Default SVG font size\n * @static\n * @memberOf fabric.Text\n */\n\n fabric.Text.DEFAULT_SVG_FONT_SIZE = 16;\n /**\n * Returns fabric.Text instance from an SVG element (<b>not yet implemented</b>)\n * @static\n * @memberOf fabric.Text\n * @param {SVGElement} element Element to parse\n * @param {Function} callback callback function invoked after parsing\n * @param {Object} [options] Options object\n */\n\n fabric.Text.fromElement = function (element, callback, options) {\n if (!element) {\n return callback(null);\n }\n\n var parsedAttributes = fabric.parseAttributes(element, fabric.Text.ATTRIBUTE_NAMES),\n parsedAnchor = parsedAttributes.textAnchor || 'left';\n options = fabric.util.object.extend(options ? clone(options) : {}, parsedAttributes);\n options.top = options.top || 0;\n options.left = options.left || 0;\n\n if (parsedAttributes.textDecoration) {\n var textDecoration = parsedAttributes.textDecoration;\n\n if (textDecoration.indexOf('underline') !== -1) {\n options.underline = true;\n }\n\n if (textDecoration.indexOf('overline') !== -1) {\n options.overline = true;\n }\n\n if (textDecoration.indexOf('line-through') !== -1) {\n options.linethrough = true;\n }\n\n delete options.textDecoration;\n }\n\n if ('dx' in parsedAttributes) {\n options.left += parsedAttributes.dx;\n }\n\n if ('dy' in parsedAttributes) {\n options.top += parsedAttributes.dy;\n }\n\n if (!('fontSize' in options)) {\n options.fontSize = fabric.Text.DEFAULT_SVG_FONT_SIZE;\n }\n\n var textContent = ''; // The XML is not properly parsed in IE9 so a workaround to get\n // textContent is through firstChild.data. Another workaround would be\n // to convert XML loaded from a file to be converted using DOMParser (same way loadSVGFromString() does)\n\n if (!('textContent' in element)) {\n if ('firstChild' in element && element.firstChild !== null) {\n if ('data' in element.firstChild && element.firstChild.data !== null) {\n textContent = element.firstChild.data;\n }\n }\n } else {\n textContent = element.textContent;\n }\n\n textContent = textContent.replace(/^\\s+|\\s+$|\\n+/g, '').replace(/\\s+/g, ' ');\n var originalStrokeWidth = options.strokeWidth;\n options.strokeWidth = 0;\n var text = new fabric.Text(textContent, options),\n textHeightScaleFactor = text.getScaledHeight() / text.height,\n lineHeightDiff = (text.height + text.strokeWidth) * text.lineHeight - text.height,\n scaledDiff = lineHeightDiff * textHeightScaleFactor,\n textHeight = text.getScaledHeight() + scaledDiff,\n offX = 0;\n /*\n Adjust positioning:\n x/y attributes in SVG correspond to the bottom-left corner of text bounding box\n fabric output by default at top, left.\n */\n\n if (parsedAnchor === 'center') {\n offX = text.getScaledWidth() / 2;\n }\n\n if (parsedAnchor === 'right') {\n offX = text.getScaledWidth();\n }\n\n text.set({\n left: text.left - offX,\n top: text.top - (textHeight - text.fontSize * (0.07 + text._fontSizeFraction)) / text.lineHeight,\n strokeWidth: typeof originalStrokeWidth !== 'undefined' ? originalStrokeWidth : 1\n });\n callback(text);\n };\n /* _FROM_SVG_END_ */\n\n /**\n * Returns fabric.Text instance from an object representation\n * @static\n * @memberOf fabric.Text\n * @param {Object} object Object to create an instance from\n * @param {Function} [callback] Callback to invoke when an fabric.Text instance is created\n */\n\n\n fabric.Text.fromObject = function (object, callback) {\n return fabric.Object._fromObject('Text', object, callback, 'text');\n };\n\n fabric.Text.genericFonts = ['sans-serif', 'serif', 'cursive', 'fantasy', 'monospace'];\n fabric.util.createAccessors && fabric.util.createAccessors(fabric.Text);\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function () {\n fabric.util.object.extend(fabric.Text.prototype,\n /** @lends fabric.Text.prototype */\n {\n /**\n * Returns true if object has no styling or no styling in a line\n * @param {Number} lineIndex , lineIndex is on wrapped lines.\n * @return {Boolean}\n */\n isEmptyStyles: function (lineIndex) {\n if (!this.styles) {\n return true;\n }\n\n if (typeof lineIndex !== 'undefined' && !this.styles[lineIndex]) {\n return true;\n }\n\n var obj = typeof lineIndex === 'undefined' ? this.styles : {\n line: this.styles[lineIndex]\n };\n\n for (var p1 in obj) {\n for (var p2 in obj[p1]) {\n // eslint-disable-next-line no-unused-vars\n for (var p3 in obj[p1][p2]) {\n return false;\n }\n }\n }\n\n return true;\n },\n\n /**\n * Returns true if object has a style property or has it ina specified line\n * This function is used to detect if a text will use a particular property or not.\n * @param {String} property to check for\n * @param {Number} lineIndex to check the style on\n * @return {Boolean}\n */\n styleHas: function (property, lineIndex) {\n if (!this.styles || !property || property === '') {\n return false;\n }\n\n if (typeof lineIndex !== 'undefined' && !this.styles[lineIndex]) {\n return false;\n }\n\n var obj = typeof lineIndex === 'undefined' ? this.styles : {\n 0: this.styles[lineIndex]\n }; // eslint-disable-next-line\n\n for (var p1 in obj) {\n // eslint-disable-next-line\n for (var p2 in obj[p1]) {\n if (typeof obj[p1][p2][property] !== 'undefined') {\n return true;\n }\n }\n }\n\n return false;\n },\n\n /**\n * Check if characters in a text have a value for a property\n * whose value matches the textbox's value for that property. If so,\n * the character-level property is deleted. If the character\n * has no other properties, then it is also deleted. Finally,\n * if the line containing that character has no other characters\n * then it also is deleted.\n *\n * @param {string} property The property to compare between characters and text.\n */\n cleanStyle: function (property) {\n if (!this.styles || !property || property === '') {\n return false;\n }\n\n var obj = this.styles,\n stylesCount = 0,\n letterCount,\n stylePropertyValue,\n allStyleObjectPropertiesMatch = true,\n graphemeCount = 0,\n styleObject; // eslint-disable-next-line\n\n for (var p1 in obj) {\n letterCount = 0; // eslint-disable-next-line\n\n for (var p2 in obj[p1]) {\n var styleObject = obj[p1][p2],\n stylePropertyHasBeenSet = styleObject.hasOwnProperty(property);\n stylesCount++;\n\n if (stylePropertyHasBeenSet) {\n if (!stylePropertyValue) {\n stylePropertyValue = styleObject[property];\n } else if (styleObject[property] !== stylePropertyValue) {\n allStyleObjectPropertiesMatch = false;\n }\n\n if (styleObject[property] === this[property]) {\n delete styleObject[property];\n }\n } else {\n allStyleObjectPropertiesMatch = false;\n }\n\n if (Object.keys(styleObject).length !== 0) {\n letterCount++;\n } else {\n delete obj[p1][p2];\n }\n }\n\n if (letterCount === 0) {\n delete obj[p1];\n }\n } // if every grapheme has the same style set then\n // delete those styles and set it on the parent\n\n\n for (var i = 0; i < this._textLines.length; i++) {\n graphemeCount += this._textLines[i].length;\n }\n\n if (allStyleObjectPropertiesMatch && stylesCount === graphemeCount) {\n this[property] = stylePropertyValue;\n this.removeStyle(property);\n }\n },\n\n /**\n * Remove a style property or properties from all individual character styles\n * in a text object. Deletes the character style object if it contains no other style\n * props. Deletes a line style object if it contains no other character styles.\n *\n * @param {String} props The property to remove from character styles.\n */\n removeStyle: function (property) {\n if (!this.styles || !property || property === '') {\n return;\n }\n\n var obj = this.styles,\n line,\n lineNum,\n charNum;\n\n for (lineNum in obj) {\n line = obj[lineNum];\n\n for (charNum in line) {\n delete line[charNum][property];\n\n if (Object.keys(line[charNum]).length === 0) {\n delete line[charNum];\n }\n }\n\n if (Object.keys(line).length === 0) {\n delete obj[lineNum];\n }\n }\n },\n\n /**\n * @private\n */\n _extendStyles: function (index, styles) {\n var loc = this.get2DCursorLocation(index);\n\n if (!this._getLineStyle(loc.lineIndex)) {\n this._setLineStyle(loc.lineIndex);\n }\n\n if (!this._getStyleDeclaration(loc.lineIndex, loc.charIndex)) {\n this._setStyleDeclaration(loc.lineIndex, loc.charIndex, {});\n }\n\n fabric.util.object.extend(this._getStyleDeclaration(loc.lineIndex, loc.charIndex), styles);\n },\n\n /**\n * Returns 2d representation (lineIndex and charIndex) of cursor (or selection start)\n * @param {Number} [selectionStart] Optional index. When not given, current selectionStart is used.\n * @param {Boolean} [skipWrapping] consider the location for unwrapped lines. useful to manage styles.\n */\n get2DCursorLocation: function (selectionStart, skipWrapping) {\n if (typeof selectionStart === 'undefined') {\n selectionStart = this.selectionStart;\n }\n\n var lines = skipWrapping ? this._unwrappedTextLines : this._textLines,\n len = lines.length;\n\n for (var i = 0; i < len; i++) {\n if (selectionStart <= lines[i].length) {\n return {\n lineIndex: i,\n charIndex: selectionStart\n };\n }\n\n selectionStart -= lines[i].length + this.missingNewlineOffset(i);\n }\n\n return {\n lineIndex: i - 1,\n charIndex: lines[i - 1].length < selectionStart ? lines[i - 1].length : selectionStart\n };\n },\n\n /**\n * Gets style of a current selection/cursor (at the start position)\n * if startIndex or endIndex are not provided, slectionStart or selectionEnd will be used.\n * @param {Number} [startIndex] Start index to get styles at\n * @param {Number} [endIndex] End index to get styles at, if not specified selectionEnd or startIndex + 1\n * @param {Boolean} [complete] get full style or not\n * @return {Array} styles an array with one, zero or more Style objects\n */\n getSelectionStyles: function (startIndex, endIndex, complete) {\n if (typeof startIndex === 'undefined') {\n startIndex = this.selectionStart || 0;\n }\n\n if (typeof endIndex === 'undefined') {\n endIndex = this.selectionEnd || startIndex;\n }\n\n var styles = [];\n\n for (var i = startIndex; i < endIndex; i++) {\n styles.push(this.getStyleAtPosition(i, complete));\n }\n\n return styles;\n },\n\n /**\n * Gets style of a current selection/cursor position\n * @param {Number} position to get styles at\n * @param {Boolean} [complete] full style if true\n * @return {Object} style Style object at a specified index\n * @private\n */\n getStyleAtPosition: function (position, complete) {\n var loc = this.get2DCursorLocation(position),\n style = complete ? this.getCompleteStyleDeclaration(loc.lineIndex, loc.charIndex) : this._getStyleDeclaration(loc.lineIndex, loc.charIndex);\n return style || {};\n },\n\n /**\n * Sets style of a current selection, if no selection exist, do not set anything.\n * @param {Object} [styles] Styles object\n * @param {Number} [startIndex] Start index to get styles at\n * @param {Number} [endIndex] End index to get styles at, if not specified selectionEnd or startIndex + 1\n * @return {fabric.IText} thisArg\n * @chainable\n */\n setSelectionStyles: function (styles, startIndex, endIndex) {\n if (typeof startIndex === 'undefined') {\n startIndex = this.selectionStart || 0;\n }\n\n if (typeof endIndex === 'undefined') {\n endIndex = this.selectionEnd || startIndex;\n }\n\n for (var i = startIndex; i < endIndex; i++) {\n this._extendStyles(i, styles);\n }\n /* not included in _extendStyles to avoid clearing cache more than once */\n\n\n this._forceClearCache = true;\n return this;\n },\n\n /**\n * get the reference, not a clone, of the style object for a given character\n * @param {Number} lineIndex\n * @param {Number} charIndex\n * @return {Object} style object\n */\n _getStyleDeclaration: function (lineIndex, charIndex) {\n var lineStyle = this.styles && this.styles[lineIndex];\n\n if (!lineStyle) {\n return null;\n }\n\n return lineStyle[charIndex];\n },\n\n /**\n * return a new object that contains all the style property for a character\n * the object returned is newly created\n * @param {Number} lineIndex of the line where the character is\n * @param {Number} charIndex position of the character on the line\n * @return {Object} style object\n */\n getCompleteStyleDeclaration: function (lineIndex, charIndex) {\n var style = this._getStyleDeclaration(lineIndex, charIndex) || {},\n styleObject = {},\n prop;\n\n for (var i = 0; i < this._styleProperties.length; i++) {\n prop = this._styleProperties[i];\n styleObject[prop] = typeof style[prop] === 'undefined' ? this[prop] : style[prop];\n }\n\n return styleObject;\n },\n\n /**\n * @param {Number} lineIndex\n * @param {Number} charIndex\n * @param {Object} style\n * @private\n */\n _setStyleDeclaration: function (lineIndex, charIndex, style) {\n this.styles[lineIndex][charIndex] = style;\n },\n\n /**\n *\n * @param {Number} lineIndex\n * @param {Number} charIndex\n * @private\n */\n _deleteStyleDeclaration: function (lineIndex, charIndex) {\n delete this.styles[lineIndex][charIndex];\n },\n\n /**\n * @param {Number} lineIndex\n * @return {Boolean} if the line exists or not\n * @private\n */\n _getLineStyle: function (lineIndex) {\n return !!this.styles[lineIndex];\n },\n\n /**\n * Set the line style to an empty object so that is initialized\n * @param {Number} lineIndex\n * @private\n */\n _setLineStyle: function (lineIndex) {\n this.styles[lineIndex] = {};\n },\n\n /**\n * @param {Number} lineIndex\n * @private\n */\n _deleteLineStyle: function (lineIndex) {\n delete this.styles[lineIndex];\n }\n });\n})();\n\n(function () {\n function parseDecoration(object) {\n if (object.textDecoration) {\n object.textDecoration.indexOf('underline') > -1 && (object.underline = true);\n object.textDecoration.indexOf('line-through') > -1 && (object.linethrough = true);\n object.textDecoration.indexOf('overline') > -1 && (object.overline = true);\n delete object.textDecoration;\n }\n }\n /**\n * IText class (introduced in <b>v1.4</b>) Events are also fired with \"text:\"\n * prefix when observing canvas.\n * @class fabric.IText\n * @extends fabric.Text\n * @mixes fabric.Observable\n *\n * @fires changed\n * @fires selection:changed\n * @fires editing:entered\n * @fires editing:exited\n *\n * @return {fabric.IText} thisArg\n * @see {@link fabric.IText#initialize} for constructor definition\n *\n * <p>Supported key combinations:</p>\n * <pre>\n * Move cursor: left, right, up, down\n * Select character: shift + left, shift + right\n * Select text vertically: shift + up, shift + down\n * Move cursor by word: alt + left, alt + right\n * Select words: shift + alt + left, shift + alt + right\n * Move cursor to line start/end: cmd + left, cmd + right or home, end\n * Select till start/end of line: cmd + shift + left, cmd + shift + right or shift + home, shift + end\n * Jump to start/end of text: cmd + up, cmd + down\n * Select till start/end of text: cmd + shift + up, cmd + shift + down or shift + pgUp, shift + pgDown\n * Delete character: backspace\n * Delete word: alt + backspace\n * Delete line: cmd + backspace\n * Forward delete: delete\n * Copy text: ctrl/cmd + c\n * Paste text: ctrl/cmd + v\n * Cut text: ctrl/cmd + x\n * Select entire text: ctrl/cmd + a\n * Quit editing tab or esc\n * </pre>\n *\n * <p>Supported mouse/touch combination</p>\n * <pre>\n * Position cursor: click/touch\n * Create selection: click/touch & drag\n * Create selection: click & shift + click\n * Select word: double click\n * Select line: triple click\n * </pre>\n */\n\n\n fabric.IText = fabric.util.createClass(fabric.Text, fabric.Observable,\n /** @lends fabric.IText.prototype */\n {\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'i-text',\n\n /**\n * Index where text selection starts (or where cursor is when there is no selection)\n * @type Number\n * @default\n */\n selectionStart: 0,\n\n /**\n * Index where text selection ends\n * @type Number\n * @default\n */\n selectionEnd: 0,\n\n /**\n * Color of text selection\n * @type String\n * @default\n */\n selectionColor: 'rgba(17,119,255,0.3)',\n\n /**\n * Indicates whether text is in editing mode\n * @type Boolean\n * @default\n */\n isEditing: false,\n\n /**\n * Indicates whether a text can be edited\n * @type Boolean\n * @default\n */\n editable: true,\n\n /**\n * Border color of text object while it's in editing mode\n * @type String\n * @default\n */\n editingBorderColor: 'rgba(102,153,255,0.25)',\n\n /**\n * Width of cursor (in px)\n * @type Number\n * @default\n */\n cursorWidth: 2,\n\n /**\n * Color of text cursor color in editing mode.\n * if not set (default) will take color from the text.\n * if set to a color value that fabric can understand, it will\n * be used instead of the color of the text at the current position.\n * @type String\n * @default\n */\n cursorColor: '',\n\n /**\n * Delay between cursor blink (in ms)\n * @type Number\n * @default\n */\n cursorDelay: 1000,\n\n /**\n * Duration of cursor fadein (in ms)\n * @type Number\n * @default\n */\n cursorDuration: 600,\n\n /**\n * Indicates whether internal text char widths can be cached\n * @type Boolean\n * @default\n */\n caching: true,\n\n /**\n * @private\n */\n _reSpace: /\\s|\\n/,\n\n /**\n * @private\n */\n _currentCursorOpacity: 0,\n\n /**\n * @private\n */\n _selectionDirection: null,\n\n /**\n * @private\n */\n _abortCursorAnimation: false,\n\n /**\n * @private\n */\n __widthOfSpace: [],\n\n /**\n * Helps determining when the text is in composition, so that the cursor\n * rendering is altered.\n */\n inCompositionMode: false,\n\n /**\n * Constructor\n * @param {String} text Text string\n * @param {Object} [options] Options object\n * @return {fabric.IText} thisArg\n */\n initialize: function (text, options) {\n this.callSuper('initialize', text, options);\n this.initBehavior();\n },\n\n /**\n * Sets selection start (left boundary of a selection)\n * @param {Number} index Index to set selection start to\n */\n setSelectionStart: function (index) {\n index = Math.max(index, 0);\n\n this._updateAndFire('selectionStart', index);\n },\n\n /**\n * Sets selection end (right boundary of a selection)\n * @param {Number} index Index to set selection end to\n */\n setSelectionEnd: function (index) {\n index = Math.min(index, this.text.length);\n\n this._updateAndFire('selectionEnd', index);\n },\n\n /**\n * @private\n * @param {String} property 'selectionStart' or 'selectionEnd'\n * @param {Number} index new position of property\n */\n _updateAndFire: function (property, index) {\n if (this[property] !== index) {\n this._fireSelectionChanged();\n\n this[property] = index;\n }\n\n this._updateTextarea();\n },\n\n /**\n * Fires the even of selection changed\n * @private\n */\n _fireSelectionChanged: function () {\n this.fire('selection:changed');\n this.canvas && this.canvas.fire('text:selection:changed', {\n target: this\n });\n },\n\n /**\n * Initialize text dimensions. Render all text on given context\n * or on a offscreen canvas to get the text width with measureText.\n * Updates this.width and this.height with the proper values.\n * Does not return dimensions.\n * @private\n */\n initDimensions: function () {\n this.isEditing && this.initDelayedCursor();\n this.clearContextTop();\n this.callSuper('initDimensions');\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n render: function (ctx) {\n this.clearContextTop();\n this.callSuper('render', ctx); // clear the cursorOffsetCache, so we ensure to calculate once per renderCursor\n // the correct position but not at every cursor animation.\n\n this.cursorOffsetCache = {};\n this.renderCursorOrSelection();\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _render: function (ctx) {\n this.callSuper('_render', ctx);\n },\n\n /**\n * Prepare and clean the contextTop\n */\n clearContextTop: function (skipRestore) {\n if (!this.isEditing || !this.canvas || !this.canvas.contextTop) {\n return;\n }\n\n var ctx = this.canvas.contextTop,\n v = this.canvas.viewportTransform;\n ctx.save();\n ctx.transform(v[0], v[1], v[2], v[3], v[4], v[5]);\n this.transform(ctx);\n\n this._clearTextArea(ctx);\n\n skipRestore || ctx.restore();\n },\n\n /**\n * Renders cursor or selection (depending on what exists)\n * it does on the contextTop. If contextTop is not available, do nothing.\n */\n renderCursorOrSelection: function () {\n if (!this.isEditing || !this.canvas || !this.canvas.contextTop) {\n return;\n }\n\n var boundaries = this._getCursorBoundaries(),\n ctx = this.canvas.contextTop;\n\n this.clearContextTop(true);\n\n if (this.selectionStart === this.selectionEnd) {\n this.renderCursor(boundaries, ctx);\n } else {\n this.renderSelection(boundaries, ctx);\n }\n\n ctx.restore();\n },\n _clearTextArea: function (ctx) {\n // we add 4 pixel, to be sure to do not leave any pixel out\n var width = this.width + 4,\n height = this.height + 4;\n ctx.clearRect(-width / 2, -height / 2, width, height);\n },\n\n /**\n * Returns cursor boundaries (left, top, leftOffset, topOffset)\n * @private\n * @param {Array} chars Array of characters\n * @param {String} typeOfBoundaries\n */\n _getCursorBoundaries: function (position) {\n // left/top are left/top of entire text box\n // leftOffset/topOffset are offset from that left/top point of a text box\n if (typeof position === 'undefined') {\n position = this.selectionStart;\n }\n\n var left = this._getLeftOffset(),\n top = this._getTopOffset(),\n offsets = this._getCursorBoundariesOffsets(position);\n\n return {\n left: left,\n top: top,\n leftOffset: offsets.left,\n topOffset: offsets.top\n };\n },\n\n /**\n * @private\n */\n _getCursorBoundariesOffsets: function (position) {\n if (this.cursorOffsetCache && 'top' in this.cursorOffsetCache) {\n return this.cursorOffsetCache;\n }\n\n var lineLeftOffset,\n lineIndex,\n charIndex,\n topOffset = 0,\n leftOffset = 0,\n boundaries,\n cursorPosition = this.get2DCursorLocation(position);\n charIndex = cursorPosition.charIndex;\n lineIndex = cursorPosition.lineIndex;\n\n for (var i = 0; i < lineIndex; i++) {\n topOffset += this.getHeightOfLine(i);\n }\n\n lineLeftOffset = this._getLineLeftOffset(lineIndex);\n var bound = this.__charBounds[lineIndex][charIndex];\n bound && (leftOffset = bound.left);\n\n if (this.charSpacing !== 0 && charIndex === this._textLines[lineIndex].length) {\n leftOffset -= this._getWidthOfCharSpacing();\n }\n\n boundaries = {\n top: topOffset,\n left: lineLeftOffset + (leftOffset > 0 ? leftOffset : 0)\n };\n this.cursorOffsetCache = boundaries;\n return this.cursorOffsetCache;\n },\n\n /**\n * Renders cursor\n * @param {Object} boundaries\n * @param {CanvasRenderingContext2D} ctx transformed context to draw on\n */\n renderCursor: function (boundaries, ctx) {\n var cursorLocation = this.get2DCursorLocation(),\n lineIndex = cursorLocation.lineIndex,\n charIndex = cursorLocation.charIndex > 0 ? cursorLocation.charIndex - 1 : 0,\n charHeight = this.getValueOfPropertyAt(lineIndex, charIndex, 'fontSize'),\n multiplier = this.scaleX * this.canvas.getZoom(),\n cursorWidth = this.cursorWidth / multiplier,\n topOffset = boundaries.topOffset,\n dy = this.getValueOfPropertyAt(lineIndex, charIndex, 'deltaY');\n topOffset += (1 - this._fontSizeFraction) * this.getHeightOfLine(lineIndex) / this.lineHeight - charHeight * (1 - this._fontSizeFraction);\n\n if (this.inCompositionMode) {\n this.renderSelection(boundaries, ctx);\n }\n\n ctx.fillStyle = this.cursorColor || this.getValueOfPropertyAt(lineIndex, charIndex, 'fill');\n ctx.globalAlpha = this.__isMousedown ? 1 : this._currentCursorOpacity;\n ctx.fillRect(boundaries.left + boundaries.leftOffset - cursorWidth / 2, topOffset + boundaries.top + dy, cursorWidth, charHeight);\n },\n\n /**\n * Renders text selection\n * @param {Object} boundaries Object with left/top/leftOffset/topOffset\n * @param {CanvasRenderingContext2D} ctx transformed context to draw on\n */\n renderSelection: function (boundaries, ctx) {\n var selectionStart = this.inCompositionMode ? this.hiddenTextarea.selectionStart : this.selectionStart,\n selectionEnd = this.inCompositionMode ? this.hiddenTextarea.selectionEnd : this.selectionEnd,\n isJustify = this.textAlign.indexOf('justify') !== -1,\n start = this.get2DCursorLocation(selectionStart),\n end = this.get2DCursorLocation(selectionEnd),\n startLine = start.lineIndex,\n endLine = end.lineIndex,\n startChar = start.charIndex < 0 ? 0 : start.charIndex,\n endChar = end.charIndex < 0 ? 0 : end.charIndex;\n\n for (var i = startLine; i <= endLine; i++) {\n var lineOffset = this._getLineLeftOffset(i) || 0,\n lineHeight = this.getHeightOfLine(i),\n realLineHeight = 0,\n boxStart = 0,\n boxEnd = 0;\n\n if (i === startLine) {\n boxStart = this.__charBounds[startLine][startChar].left;\n }\n\n if (i >= startLine && i < endLine) {\n boxEnd = isJustify && !this.isEndOfWrapping(i) ? this.width : this.getLineWidth(i) || 5; // WTF is this 5?\n } else if (i === endLine) {\n if (endChar === 0) {\n boxEnd = this.__charBounds[endLine][endChar].left;\n } else {\n var charSpacing = this._getWidthOfCharSpacing();\n\n boxEnd = this.__charBounds[endLine][endChar - 1].left + this.__charBounds[endLine][endChar - 1].width - charSpacing;\n }\n }\n\n realLineHeight = lineHeight;\n\n if (this.lineHeight < 1 || i === endLine && this.lineHeight > 1) {\n lineHeight /= this.lineHeight;\n }\n\n if (this.inCompositionMode) {\n ctx.fillStyle = this.compositionColor || 'black';\n ctx.fillRect(boundaries.left + lineOffset + boxStart, boundaries.top + boundaries.topOffset + lineHeight, boxEnd - boxStart, 1);\n } else {\n ctx.fillStyle = this.selectionColor;\n ctx.fillRect(boundaries.left + lineOffset + boxStart, boundaries.top + boundaries.topOffset, boxEnd - boxStart, lineHeight);\n }\n\n boundaries.topOffset += realLineHeight;\n }\n },\n\n /**\n * High level function to know the height of the cursor.\n * the currentChar is the one that precedes the cursor\n * Returns fontSize of char at the current cursor\n * Unused from the library, is for the end user\n * @return {Number} Character font size\n */\n getCurrentCharFontSize: function () {\n var cp = this._getCurrentCharIndex();\n\n return this.getValueOfPropertyAt(cp.l, cp.c, 'fontSize');\n },\n\n /**\n * High level function to know the color of the cursor.\n * the currentChar is the one that precedes the cursor\n * Returns color (fill) of char at the current cursor\n * Unused from the library, is for the end user\n * @return {String} Character color (fill)\n */\n getCurrentCharColor: function () {\n var cp = this._getCurrentCharIndex();\n\n return this.getValueOfPropertyAt(cp.l, cp.c, 'fill');\n },\n\n /**\n * Returns the cursor position for the getCurrent.. functions\n * @private\n */\n _getCurrentCharIndex: function () {\n var cursorPosition = this.get2DCursorLocation(this.selectionStart, true),\n charIndex = cursorPosition.charIndex > 0 ? cursorPosition.charIndex - 1 : 0;\n return {\n l: cursorPosition.lineIndex,\n c: charIndex\n };\n }\n });\n /**\n * Returns fabric.IText instance from an object representation\n * @static\n * @memberOf fabric.IText\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] invoked with new instance as argument\n */\n\n fabric.IText.fromObject = function (object, callback) {\n parseDecoration(object);\n\n if (object.styles) {\n for (var i in object.styles) {\n for (var j in object.styles[i]) {\n parseDecoration(object.styles[i][j]);\n }\n }\n }\n\n fabric.Object._fromObject('IText', object, callback, 'text');\n };\n})();\n\n(function () {\n var clone = fabric.util.object.clone;\n fabric.util.object.extend(fabric.IText.prototype,\n /** @lends fabric.IText.prototype */\n {\n /**\n * Initializes all the interactive behavior of IText\n */\n initBehavior: function () {\n this.initAddedHandler();\n this.initRemovedHandler();\n this.initCursorSelectionHandlers();\n this.initDoubleClickSimulation();\n this.mouseMoveHandler = this.mouseMoveHandler.bind(this);\n },\n onDeselect: function () {\n this.isEditing && this.exitEditing();\n this.selected = false;\n },\n\n /**\n * Initializes \"added\" event handler\n */\n initAddedHandler: function () {\n var _this = this;\n\n this.on('added', function () {\n var canvas = _this.canvas;\n\n if (canvas) {\n if (!canvas._hasITextHandlers) {\n canvas._hasITextHandlers = true;\n\n _this._initCanvasHandlers(canvas);\n }\n\n canvas._iTextInstances = canvas._iTextInstances || [];\n\n canvas._iTextInstances.push(_this);\n }\n });\n },\n initRemovedHandler: function () {\n var _this = this;\n\n this.on('removed', function () {\n var canvas = _this.canvas;\n\n if (canvas) {\n canvas._iTextInstances = canvas._iTextInstances || [];\n fabric.util.removeFromArray(canvas._iTextInstances, _this);\n\n if (canvas._iTextInstances.length === 0) {\n canvas._hasITextHandlers = false;\n\n _this._removeCanvasHandlers(canvas);\n }\n }\n });\n },\n\n /**\n * register canvas event to manage exiting on other instances\n * @private\n */\n _initCanvasHandlers: function (canvas) {\n canvas._mouseUpITextHandler = function () {\n if (canvas._iTextInstances) {\n canvas._iTextInstances.forEach(function (obj) {\n obj.__isMousedown = false;\n });\n }\n };\n\n canvas.on('mouse:up', canvas._mouseUpITextHandler);\n },\n\n /**\n * remove canvas event to manage exiting on other instances\n * @private\n */\n _removeCanvasHandlers: function (canvas) {\n canvas.off('mouse:up', canvas._mouseUpITextHandler);\n },\n\n /**\n * @private\n */\n _tick: function () {\n this._currentTickState = this._animateCursor(this, 1, this.cursorDuration, '_onTickComplete');\n },\n\n /**\n * @private\n */\n _animateCursor: function (obj, targetOpacity, duration, completeMethod) {\n var tickState;\n tickState = {\n isAborted: false,\n abort: function () {\n this.isAborted = true;\n }\n };\n obj.animate('_currentCursorOpacity', targetOpacity, {\n duration: duration,\n onComplete: function () {\n if (!tickState.isAborted) {\n obj[completeMethod]();\n }\n },\n onChange: function () {\n // we do not want to animate a selection, only cursor\n if (obj.canvas && obj.selectionStart === obj.selectionEnd) {\n obj.renderCursorOrSelection();\n }\n },\n abort: function () {\n return tickState.isAborted;\n }\n });\n return tickState;\n },\n\n /**\n * @private\n */\n _onTickComplete: function () {\n var _this = this;\n\n if (this._cursorTimeout1) {\n clearTimeout(this._cursorTimeout1);\n }\n\n this._cursorTimeout1 = setTimeout(function () {\n _this._currentTickCompleteState = _this._animateCursor(_this, 0, this.cursorDuration / 2, '_tick');\n }, 100);\n },\n\n /**\n * Initializes delayed cursor\n */\n initDelayedCursor: function (restart) {\n var _this = this,\n delay = restart ? 0 : this.cursorDelay;\n\n this.abortCursorAnimation();\n this._currentCursorOpacity = 1;\n this._cursorTimeout2 = setTimeout(function () {\n _this._tick();\n }, delay);\n },\n\n /**\n * Aborts cursor animation and clears all timeouts\n */\n abortCursorAnimation: function () {\n var shouldClear = this._currentTickState || this._currentTickCompleteState,\n canvas = this.canvas;\n this._currentTickState && this._currentTickState.abort();\n this._currentTickCompleteState && this._currentTickCompleteState.abort();\n clearTimeout(this._cursorTimeout1);\n clearTimeout(this._cursorTimeout2);\n this._currentCursorOpacity = 0; // to clear just itext area we need to transform the context\n // it may not be worth it\n\n if (shouldClear && canvas) {\n canvas.clearContext(canvas.contextTop || canvas.contextContainer);\n }\n },\n\n /**\n * Selects entire text\n * @return {fabric.IText} thisArg\n * @chainable\n */\n selectAll: function () {\n this.selectionStart = 0;\n this.selectionEnd = this._text.length;\n\n this._fireSelectionChanged();\n\n this._updateTextarea();\n\n return this;\n },\n\n /**\n * Returns selected text\n * @return {String}\n */\n getSelectedText: function () {\n return this._text.slice(this.selectionStart, this.selectionEnd).join('');\n },\n\n /**\n * Find new selection index representing start of current word according to current selection index\n * @param {Number} startFrom Current selection index\n * @return {Number} New selection index\n */\n findWordBoundaryLeft: function (startFrom) {\n var offset = 0,\n index = startFrom - 1; // remove space before cursor first\n\n if (this._reSpace.test(this._text[index])) {\n while (this._reSpace.test(this._text[index])) {\n offset++;\n index--;\n }\n }\n\n while (/\\S/.test(this._text[index]) && index > -1) {\n offset++;\n index--;\n }\n\n return startFrom - offset;\n },\n\n /**\n * Find new selection index representing end of current word according to current selection index\n * @param {Number} startFrom Current selection index\n * @return {Number} New selection index\n */\n findWordBoundaryRight: function (startFrom) {\n var offset = 0,\n index = startFrom; // remove space after cursor first\n\n if (this._reSpace.test(this._text[index])) {\n while (this._reSpace.test(this._text[index])) {\n offset++;\n index++;\n }\n }\n\n while (/\\S/.test(this._text[index]) && index < this._text.length) {\n offset++;\n index++;\n }\n\n return startFrom + offset;\n },\n\n /**\n * Find new selection index representing start of current line according to current selection index\n * @param {Number} startFrom Current selection index\n * @return {Number} New selection index\n */\n findLineBoundaryLeft: function (startFrom) {\n var offset = 0,\n index = startFrom - 1;\n\n while (!/\\n/.test(this._text[index]) && index > -1) {\n offset++;\n index--;\n }\n\n return startFrom - offset;\n },\n\n /**\n * Find new selection index representing end of current line according to current selection index\n * @param {Number} startFrom Current selection index\n * @return {Number} New selection index\n */\n findLineBoundaryRight: function (startFrom) {\n var offset = 0,\n index = startFrom;\n\n while (!/\\n/.test(this._text[index]) && index < this._text.length) {\n offset++;\n index++;\n }\n\n return startFrom + offset;\n },\n\n /**\n * Finds index corresponding to beginning or end of a word\n * @param {Number} selectionStart Index of a character\n * @param {Number} direction 1 or -1\n * @return {Number} Index of the beginning or end of a word\n */\n searchWordBoundary: function (selectionStart, direction) {\n var text = this._text,\n index = this._reSpace.test(text[selectionStart]) ? selectionStart - 1 : selectionStart,\n _char = text[index],\n // wrong\n reNonWord = fabric.reNonWord;\n\n while (!reNonWord.test(_char) && index > 0 && index < text.length) {\n index += direction;\n _char = text[index];\n }\n\n if (reNonWord.test(_char)) {\n index += direction === 1 ? 0 : 1;\n }\n\n return index;\n },\n\n /**\n * Selects a word based on the index\n * @param {Number} selectionStart Index of a character\n */\n selectWord: function (selectionStart) {\n selectionStart = selectionStart || this.selectionStart;\n var newSelectionStart = this.searchWordBoundary(selectionStart, -1),\n\n /* search backwards */\n newSelectionEnd = this.searchWordBoundary(selectionStart, 1);\n /* search forward */\n\n this.selectionStart = newSelectionStart;\n this.selectionEnd = newSelectionEnd;\n\n this._fireSelectionChanged();\n\n this._updateTextarea();\n\n this.renderCursorOrSelection();\n },\n\n /**\n * Selects a line based on the index\n * @param {Number} selectionStart Index of a character\n * @return {fabric.IText} thisArg\n * @chainable\n */\n selectLine: function (selectionStart) {\n selectionStart = selectionStart || this.selectionStart;\n var newSelectionStart = this.findLineBoundaryLeft(selectionStart),\n newSelectionEnd = this.findLineBoundaryRight(selectionStart);\n this.selectionStart = newSelectionStart;\n this.selectionEnd = newSelectionEnd;\n\n this._fireSelectionChanged();\n\n this._updateTextarea();\n\n return this;\n },\n\n /**\n * Enters editing state\n * @return {fabric.IText} thisArg\n * @chainable\n */\n enterEditing: function (e) {\n if (this.isEditing || !this.editable) {\n return;\n }\n\n if (this.canvas) {\n this.canvas.calcOffset();\n this.exitEditingOnOthers(this.canvas);\n }\n\n this.isEditing = true;\n this.initHiddenTextarea(e);\n this.hiddenTextarea.focus();\n this.hiddenTextarea.value = this.text;\n\n this._updateTextarea();\n\n this._saveEditingProps();\n\n this._setEditingProps();\n\n this._textBeforeEdit = this.text;\n\n this._tick();\n\n this.fire('editing:entered');\n\n this._fireSelectionChanged();\n\n if (!this.canvas) {\n return this;\n }\n\n this.canvas.fire('text:editing:entered', {\n target: this\n });\n this.initMouseMoveHandler();\n this.canvas.requestRenderAll();\n return this;\n },\n exitEditingOnOthers: function (canvas) {\n if (canvas._iTextInstances) {\n canvas._iTextInstances.forEach(function (obj) {\n obj.selected = false;\n\n if (obj.isEditing) {\n obj.exitEditing();\n }\n });\n }\n },\n\n /**\n * Initializes \"mousemove\" event handler\n */\n initMouseMoveHandler: function () {\n this.canvas.on('mouse:move', this.mouseMoveHandler);\n },\n\n /**\n * @private\n */\n mouseMoveHandler: function (options) {\n if (!this.__isMousedown || !this.isEditing) {\n return;\n }\n\n var newSelectionStart = this.getSelectionStartFromPointer(options.e),\n currentStart = this.selectionStart,\n currentEnd = this.selectionEnd;\n\n if ((newSelectionStart !== this.__selectionStartOnMouseDown || currentStart === currentEnd) && (currentStart === newSelectionStart || currentEnd === newSelectionStart)) {\n return;\n }\n\n if (newSelectionStart > this.__selectionStartOnMouseDown) {\n this.selectionStart = this.__selectionStartOnMouseDown;\n this.selectionEnd = newSelectionStart;\n } else {\n this.selectionStart = newSelectionStart;\n this.selectionEnd = this.__selectionStartOnMouseDown;\n }\n\n if (this.selectionStart !== currentStart || this.selectionEnd !== currentEnd) {\n this.restartCursorIfNeeded();\n\n this._fireSelectionChanged();\n\n this._updateTextarea();\n\n this.renderCursorOrSelection();\n }\n },\n\n /**\n * @private\n */\n _setEditingProps: function () {\n this.hoverCursor = 'text';\n\n if (this.canvas) {\n this.canvas.defaultCursor = this.canvas.moveCursor = 'text';\n }\n\n this.borderColor = this.editingBorderColor;\n this.hasControls = this.selectable = false;\n this.lockMovementX = this.lockMovementY = true;\n },\n\n /**\n * convert from textarea to grapheme indexes\n */\n fromStringToGraphemeSelection: function (start, end, text) {\n var smallerTextStart = text.slice(0, start),\n graphemeStart = fabric.util.string.graphemeSplit(smallerTextStart).length;\n\n if (start === end) {\n return {\n selectionStart: graphemeStart,\n selectionEnd: graphemeStart\n };\n }\n\n var smallerTextEnd = text.slice(start, end),\n graphemeEnd = fabric.util.string.graphemeSplit(smallerTextEnd).length;\n return {\n selectionStart: graphemeStart,\n selectionEnd: graphemeStart + graphemeEnd\n };\n },\n\n /**\n * convert from fabric to textarea values\n */\n fromGraphemeToStringSelection: function (start, end, _text) {\n var smallerTextStart = _text.slice(0, start),\n graphemeStart = smallerTextStart.join('').length;\n\n if (start === end) {\n return {\n selectionStart: graphemeStart,\n selectionEnd: graphemeStart\n };\n }\n\n var smallerTextEnd = _text.slice(start, end),\n graphemeEnd = smallerTextEnd.join('').length;\n\n return {\n selectionStart: graphemeStart,\n selectionEnd: graphemeStart + graphemeEnd\n };\n },\n\n /**\n * @private\n */\n _updateTextarea: function () {\n this.cursorOffsetCache = {};\n\n if (!this.hiddenTextarea) {\n return;\n }\n\n if (!this.inCompositionMode) {\n var newSelection = this.fromGraphemeToStringSelection(this.selectionStart, this.selectionEnd, this._text);\n this.hiddenTextarea.selectionStart = newSelection.selectionStart;\n this.hiddenTextarea.selectionEnd = newSelection.selectionEnd;\n }\n\n this.updateTextareaPosition();\n },\n\n /**\n * @private\n */\n updateFromTextArea: function () {\n if (!this.hiddenTextarea) {\n return;\n }\n\n this.cursorOffsetCache = {};\n this.text = this.hiddenTextarea.value;\n\n if (this._shouldClearDimensionCache()) {\n this.initDimensions();\n this.setCoords();\n }\n\n var newSelection = this.fromStringToGraphemeSelection(this.hiddenTextarea.selectionStart, this.hiddenTextarea.selectionEnd, this.hiddenTextarea.value);\n this.selectionEnd = this.selectionStart = newSelection.selectionEnd;\n\n if (!this.inCompositionMode) {\n this.selectionStart = newSelection.selectionStart;\n }\n\n this.updateTextareaPosition();\n },\n\n /**\n * @private\n */\n updateTextareaPosition: function () {\n if (this.selectionStart === this.selectionEnd) {\n var style = this._calcTextareaPosition();\n\n this.hiddenTextarea.style.left = style.left;\n this.hiddenTextarea.style.top = style.top;\n }\n },\n\n /**\n * @private\n * @return {Object} style contains style for hiddenTextarea\n */\n _calcTextareaPosition: function () {\n if (!this.canvas) {\n return {\n x: 1,\n y: 1\n };\n }\n\n var desiredPosition = this.inCompositionMode ? this.compositionStart : this.selectionStart,\n boundaries = this._getCursorBoundaries(desiredPosition),\n cursorLocation = this.get2DCursorLocation(desiredPosition),\n lineIndex = cursorLocation.lineIndex,\n charIndex = cursorLocation.charIndex,\n charHeight = this.getValueOfPropertyAt(lineIndex, charIndex, 'fontSize') * this.lineHeight,\n leftOffset = boundaries.leftOffset,\n m = this.calcTransformMatrix(),\n p = {\n x: boundaries.left + leftOffset,\n y: boundaries.top + boundaries.topOffset + charHeight\n },\n retinaScaling = this.canvas.getRetinaScaling(),\n upperCanvas = this.canvas.upperCanvasEl,\n upperCanvasWidth = upperCanvas.width / retinaScaling,\n upperCanvasHeight = upperCanvas.height / retinaScaling,\n maxWidth = upperCanvasWidth - charHeight,\n maxHeight = upperCanvasHeight - charHeight,\n scaleX = upperCanvas.clientWidth / upperCanvasWidth,\n scaleY = upperCanvas.clientHeight / upperCanvasHeight;\n\n p = fabric.util.transformPoint(p, m);\n p = fabric.util.transformPoint(p, this.canvas.viewportTransform);\n p.x *= scaleX;\n p.y *= scaleY;\n\n if (p.x < 0) {\n p.x = 0;\n }\n\n if (p.x > maxWidth) {\n p.x = maxWidth;\n }\n\n if (p.y < 0) {\n p.y = 0;\n }\n\n if (p.y > maxHeight) {\n p.y = maxHeight;\n } // add canvas offset on document\n\n\n p.x += this.canvas._offset.left;\n p.y += this.canvas._offset.top;\n return {\n left: p.x + 'px',\n top: p.y + 'px',\n fontSize: charHeight + 'px',\n charHeight: charHeight\n };\n },\n\n /**\n * @private\n */\n _saveEditingProps: function () {\n this._savedProps = {\n hasControls: this.hasControls,\n borderColor: this.borderColor,\n lockMovementX: this.lockMovementX,\n lockMovementY: this.lockMovementY,\n hoverCursor: this.hoverCursor,\n selectable: this.selectable,\n defaultCursor: this.canvas && this.canvas.defaultCursor,\n moveCursor: this.canvas && this.canvas.moveCursor\n };\n },\n\n /**\n * @private\n */\n _restoreEditingProps: function () {\n if (!this._savedProps) {\n return;\n }\n\n this.hoverCursor = this._savedProps.hoverCursor;\n this.hasControls = this._savedProps.hasControls;\n this.borderColor = this._savedProps.borderColor;\n this.selectable = this._savedProps.selectable;\n this.lockMovementX = this._savedProps.lockMovementX;\n this.lockMovementY = this._savedProps.lockMovementY;\n\n if (this.canvas) {\n this.canvas.defaultCursor = this._savedProps.defaultCursor;\n this.canvas.moveCursor = this._savedProps.moveCursor;\n }\n },\n\n /**\n * Exits from editing state\n * @return {fabric.IText} thisArg\n * @chainable\n */\n exitEditing: function () {\n var isTextChanged = this._textBeforeEdit !== this.text;\n var hiddenTextarea = this.hiddenTextarea;\n this.selected = false;\n this.isEditing = false;\n this.selectionEnd = this.selectionStart;\n\n if (hiddenTextarea) {\n hiddenTextarea.blur && hiddenTextarea.blur();\n hiddenTextarea.parentNode && hiddenTextarea.parentNode.removeChild(hiddenTextarea);\n }\n\n this.hiddenTextarea = null;\n this.abortCursorAnimation();\n\n this._restoreEditingProps();\n\n this._currentCursorOpacity = 0;\n\n if (this._shouldClearDimensionCache()) {\n this.initDimensions();\n this.setCoords();\n }\n\n this.fire('editing:exited');\n isTextChanged && this.fire('modified');\n\n if (this.canvas) {\n this.canvas.off('mouse:move', this.mouseMoveHandler);\n this.canvas.fire('text:editing:exited', {\n target: this\n });\n isTextChanged && this.canvas.fire('object:modified', {\n target: this\n });\n }\n\n return this;\n },\n\n /**\n * @private\n */\n _removeExtraneousStyles: function () {\n for (var prop in this.styles) {\n if (!this._textLines[prop]) {\n delete this.styles[prop];\n }\n }\n },\n\n /**\n * remove and reflow a style block from start to end.\n * @param {Number} start linear start position for removal (included in removal)\n * @param {Number} end linear end position for removal ( excluded from removal )\n */\n removeStyleFromTo: function (start, end) {\n var cursorStart = this.get2DCursorLocation(start, true),\n cursorEnd = this.get2DCursorLocation(end, true),\n lineStart = cursorStart.lineIndex,\n charStart = cursorStart.charIndex,\n lineEnd = cursorEnd.lineIndex,\n charEnd = cursorEnd.charIndex,\n i,\n styleObj;\n\n if (lineStart !== lineEnd) {\n // step1 remove the trailing of lineStart\n if (this.styles[lineStart]) {\n for (i = charStart; i < this._unwrappedTextLines[lineStart].length; i++) {\n delete this.styles[lineStart][i];\n }\n } // step2 move the trailing of lineEnd to lineStart if needed\n\n\n if (this.styles[lineEnd]) {\n for (i = charEnd; i < this._unwrappedTextLines[lineEnd].length; i++) {\n styleObj = this.styles[lineEnd][i];\n\n if (styleObj) {\n this.styles[lineStart] || (this.styles[lineStart] = {});\n this.styles[lineStart][charStart + i - charEnd] = styleObj;\n }\n }\n } // step3 detects lines will be completely removed.\n\n\n for (i = lineStart + 1; i <= lineEnd; i++) {\n delete this.styles[i];\n } // step4 shift remaining lines.\n\n\n this.shiftLineStyles(lineEnd, lineStart - lineEnd);\n } else {\n // remove and shift left on the same line\n if (this.styles[lineStart]) {\n styleObj = this.styles[lineStart];\n\n var diff = charEnd - charStart,\n numericChar,\n _char;\n\n for (i = charStart; i < charEnd; i++) {\n delete styleObj[i];\n }\n\n for (_char in this.styles[lineStart]) {\n numericChar = parseInt(_char, 10);\n\n if (numericChar >= charEnd) {\n styleObj[numericChar - diff] = styleObj[_char];\n delete styleObj[_char];\n }\n }\n }\n }\n },\n\n /**\n * Shifts line styles up or down\n * @param {Number} lineIndex Index of a line\n * @param {Number} offset Can any number?\n */\n shiftLineStyles: function (lineIndex, offset) {\n // shift all line styles by offset upward or downward\n // do not clone deep. we need new array, not new style objects\n var clonedStyles = clone(this.styles);\n\n for (var line in this.styles) {\n var numericLine = parseInt(line, 10);\n\n if (numericLine > lineIndex) {\n this.styles[numericLine + offset] = clonedStyles[numericLine];\n\n if (!clonedStyles[numericLine - offset]) {\n delete this.styles[numericLine];\n }\n }\n }\n },\n restartCursorIfNeeded: function () {\n if (!this._currentTickState || this._currentTickState.isAborted || !this._currentTickCompleteState || this._currentTickCompleteState.isAborted) {\n this.initDelayedCursor();\n }\n },\n\n /**\n * Handle insertion of more consecutive style lines for when one or more\n * newlines gets added to the text. Since current style needs to be shifted\n * first we shift the current style of the number lines needed, then we add\n * new lines from the last to the first.\n * @param {Number} lineIndex Index of a line\n * @param {Number} charIndex Index of a char\n * @param {Number} qty number of lines to add\n * @param {Array} copiedStyle Array of objects styles\n */\n insertNewlineStyleObject: function (lineIndex, charIndex, qty, copiedStyle) {\n var currentCharStyle,\n newLineStyles = {},\n somethingAdded = false,\n isEndOfLine = this._unwrappedTextLines[lineIndex].length === charIndex;\n qty || (qty = 1);\n this.shiftLineStyles(lineIndex, qty);\n\n if (this.styles[lineIndex]) {\n currentCharStyle = this.styles[lineIndex][charIndex === 0 ? charIndex : charIndex - 1];\n } // we clone styles of all chars\n // after cursor onto the current line\n\n\n for (var index in this.styles[lineIndex]) {\n var numIndex = parseInt(index, 10);\n\n if (numIndex >= charIndex) {\n somethingAdded = true;\n newLineStyles[numIndex - charIndex] = this.styles[lineIndex][index]; // remove lines from the previous line since they're on a new line now\n\n if (!(isEndOfLine && charIndex === 0)) {\n delete this.styles[lineIndex][index];\n }\n }\n }\n\n var styleCarriedOver = false;\n\n if (somethingAdded && !isEndOfLine) {\n // if is end of line, the extra style we copied\n // is probably not something we want\n this.styles[lineIndex + qty] = newLineStyles;\n styleCarriedOver = true;\n }\n\n if (styleCarriedOver) {\n // skip the last line of since we already prepared it.\n qty--;\n } // for the all the lines or all the other lines\n // we clone current char style onto the next (otherwise empty) line\n\n\n while (qty > 0) {\n if (copiedStyle && copiedStyle[qty - 1]) {\n this.styles[lineIndex + qty] = {\n 0: clone(copiedStyle[qty - 1])\n };\n } else if (currentCharStyle) {\n this.styles[lineIndex + qty] = {\n 0: clone(currentCharStyle)\n };\n } else {\n delete this.styles[lineIndex + qty];\n }\n\n qty--;\n }\n\n this._forceClearCache = true;\n },\n\n /**\n * Inserts style object for a given line/char index\n * @param {Number} lineIndex Index of a line\n * @param {Number} charIndex Index of a char\n * @param {Number} quantity number Style object to insert, if given\n * @param {Array} copiedStyle array of style objects\n */\n insertCharStyleObject: function (lineIndex, charIndex, quantity, copiedStyle) {\n if (!this.styles) {\n this.styles = {};\n }\n\n var currentLineStyles = this.styles[lineIndex],\n currentLineStylesCloned = currentLineStyles ? clone(currentLineStyles) : {};\n quantity || (quantity = 1); // shift all char styles by quantity forward\n // 0,1,2,3 -> (charIndex=2) -> 0,1,3,4 -> (insert 2) -> 0,1,2,3,4\n\n for (var index in currentLineStylesCloned) {\n var numericIndex = parseInt(index, 10);\n\n if (numericIndex >= charIndex) {\n currentLineStyles[numericIndex + quantity] = currentLineStylesCloned[numericIndex]; // only delete the style if there was nothing moved there\n\n if (!currentLineStylesCloned[numericIndex - quantity]) {\n delete currentLineStyles[numericIndex];\n }\n }\n }\n\n this._forceClearCache = true;\n\n if (copiedStyle) {\n while (quantity--) {\n if (!Object.keys(copiedStyle[quantity]).length) {\n continue;\n }\n\n if (!this.styles[lineIndex]) {\n this.styles[lineIndex] = {};\n }\n\n this.styles[lineIndex][charIndex + quantity] = clone(copiedStyle[quantity]);\n }\n\n return;\n }\n\n if (!currentLineStyles) {\n return;\n }\n\n var newStyle = currentLineStyles[charIndex ? charIndex - 1 : 1];\n\n while (newStyle && quantity--) {\n this.styles[lineIndex][charIndex + quantity] = clone(newStyle);\n }\n },\n\n /**\n * Inserts style object(s)\n * @param {Array} insertedText Characters at the location where style is inserted\n * @param {Number} start cursor index for inserting style\n * @param {Array} [copiedStyle] array of style objects to insert.\n */\n insertNewStyleBlock: function (insertedText, start, copiedStyle) {\n var cursorLoc = this.get2DCursorLocation(start, true),\n addedLines = [0],\n linesLength = 0; // get an array of how many char per lines are being added.\n\n for (var i = 0; i < insertedText.length; i++) {\n if (insertedText[i] === '\\n') {\n linesLength++;\n addedLines[linesLength] = 0;\n } else {\n addedLines[linesLength]++;\n }\n } // for the first line copy the style from the current char position.\n\n\n if (addedLines[0] > 0) {\n this.insertCharStyleObject(cursorLoc.lineIndex, cursorLoc.charIndex, addedLines[0], copiedStyle);\n copiedStyle = copiedStyle && copiedStyle.slice(addedLines[0] + 1);\n }\n\n linesLength && this.insertNewlineStyleObject(cursorLoc.lineIndex, cursorLoc.charIndex + addedLines[0], linesLength);\n\n for (var i = 1; i < linesLength; i++) {\n if (addedLines[i] > 0) {\n this.insertCharStyleObject(cursorLoc.lineIndex + i, 0, addedLines[i], copiedStyle);\n } else if (copiedStyle) {\n this.styles[cursorLoc.lineIndex + i][0] = copiedStyle[0];\n }\n\n copiedStyle = copiedStyle && copiedStyle.slice(addedLines[i] + 1);\n } // we use i outside the loop to get it like linesLength\n\n\n if (addedLines[i] > 0) {\n this.insertCharStyleObject(cursorLoc.lineIndex + i, 0, addedLines[i], copiedStyle);\n }\n },\n\n /**\n * Set the selectionStart and selectionEnd according to the new position of cursor\n * mimic the key - mouse navigation when shift is pressed.\n */\n setSelectionStartEndWithShift: function (start, end, newSelection) {\n if (newSelection <= start) {\n if (end === start) {\n this._selectionDirection = 'left';\n } else if (this._selectionDirection === 'right') {\n this._selectionDirection = 'left';\n this.selectionEnd = start;\n }\n\n this.selectionStart = newSelection;\n } else if (newSelection > start && newSelection < end) {\n if (this._selectionDirection === 'right') {\n this.selectionEnd = newSelection;\n } else {\n this.selectionStart = newSelection;\n }\n } else {\n // newSelection is > selection start and end\n if (end === start) {\n this._selectionDirection = 'right';\n } else if (this._selectionDirection === 'left') {\n this._selectionDirection = 'right';\n this.selectionStart = end;\n }\n\n this.selectionEnd = newSelection;\n }\n },\n setSelectionInBoundaries: function () {\n var length = this.text.length;\n\n if (this.selectionStart > length) {\n this.selectionStart = length;\n } else if (this.selectionStart < 0) {\n this.selectionStart = 0;\n }\n\n if (this.selectionEnd > length) {\n this.selectionEnd = length;\n } else if (this.selectionEnd < 0) {\n this.selectionEnd = 0;\n }\n }\n });\n})();\n\nfabric.util.object.extend(fabric.IText.prototype,\n/** @lends fabric.IText.prototype */\n{\n /**\n * Initializes \"dbclick\" event handler\n */\n initDoubleClickSimulation: function () {\n // for double click\n this.__lastClickTime = +new Date(); // for triple click\n\n this.__lastLastClickTime = +new Date();\n this.__lastPointer = {};\n this.on('mousedown', this.onMouseDown);\n },\n\n /**\n * Default event handler to simulate triple click\n * @private\n */\n onMouseDown: function (options) {\n if (!this.canvas) {\n return;\n }\n\n this.__newClickTime = +new Date();\n var newPointer = options.pointer;\n\n if (this.isTripleClick(newPointer)) {\n this.fire('tripleclick', options);\n\n this._stopEvent(options.e);\n }\n\n this.__lastLastClickTime = this.__lastClickTime;\n this.__lastClickTime = this.__newClickTime;\n this.__lastPointer = newPointer;\n this.__lastIsEditing = this.isEditing;\n this.__lastSelected = this.selected;\n },\n isTripleClick: function (newPointer) {\n return this.__newClickTime - this.__lastClickTime < 500 && this.__lastClickTime - this.__lastLastClickTime < 500 && this.__lastPointer.x === newPointer.x && this.__lastPointer.y === newPointer.y;\n },\n\n /**\n * @private\n */\n _stopEvent: function (e) {\n e.preventDefault && e.preventDefault();\n e.stopPropagation && e.stopPropagation();\n },\n\n /**\n * Initializes event handlers related to cursor or selection\n */\n initCursorSelectionHandlers: function () {\n this.initMousedownHandler();\n this.initMouseupHandler();\n this.initClicks();\n },\n\n /**\n * Default handler for double click, select a word\n */\n doubleClickHandler: function (options) {\n if (!this.isEditing) {\n return;\n }\n\n this.selectWord(this.getSelectionStartFromPointer(options.e));\n },\n\n /**\n * Default handler for triple click, select a line\n */\n tripleClickHandler: function (options) {\n if (!this.isEditing) {\n return;\n }\n\n this.selectLine(this.getSelectionStartFromPointer(options.e));\n },\n\n /**\n * Initializes double and triple click event handlers\n */\n initClicks: function () {\n this.on('mousedblclick', this.doubleClickHandler);\n this.on('tripleclick', this.tripleClickHandler);\n },\n\n /**\n * Default event handler for the basic functionalities needed on _mouseDown\n * can be overridden to do something different.\n * Scope of this implementation is: find the click position, set selectionStart\n * find selectionEnd, initialize the drawing of either cursor or selection area\n * initializing a mousedDown on a text area will cancel fabricjs knowledge of\n * current compositionMode. It will be set to false.\n */\n _mouseDownHandler: function (options) {\n if (!this.canvas || !this.editable || options.e.button && options.e.button !== 1) {\n return;\n }\n\n this.__isMousedown = true;\n\n if (this.selected) {\n this.inCompositionMode = false;\n this.setCursorByClick(options.e);\n }\n\n if (this.isEditing) {\n this.__selectionStartOnMouseDown = this.selectionStart;\n\n if (this.selectionStart === this.selectionEnd) {\n this.abortCursorAnimation();\n }\n\n this.renderCursorOrSelection();\n }\n },\n\n /**\n * Default event handler for the basic functionalities needed on mousedown:before\n * can be overridden to do something different.\n * Scope of this implementation is: verify the object is already selected when mousing down\n */\n _mouseDownHandlerBefore: function (options) {\n if (!this.canvas || !this.editable || options.e.button && options.e.button !== 1) {\n return;\n } // we want to avoid that an object that was selected and then becomes unselectable,\n // may trigger editing mode in some way.\n\n\n this.selected = this === this.canvas._activeObject;\n },\n\n /**\n * Initializes \"mousedown\" event handler\n */\n initMousedownHandler: function () {\n this.on('mousedown', this._mouseDownHandler);\n this.on('mousedown:before', this._mouseDownHandlerBefore);\n },\n\n /**\n * Initializes \"mouseup\" event handler\n */\n initMouseupHandler: function () {\n this.on('mouseup', this.mouseUpHandler);\n },\n\n /**\n * standard hander for mouse up, overridable\n * @private\n */\n mouseUpHandler: function (options) {\n this.__isMousedown = false;\n\n if (!this.editable || this.group || options.transform && options.transform.actionPerformed || options.e.button && options.e.button !== 1) {\n return;\n }\n\n if (this.canvas) {\n var currentActive = this.canvas._activeObject;\n\n if (currentActive && currentActive !== this) {\n // avoid running this logic when there is an active object\n // this because is possible with shift click and fast clicks,\n // to rapidly deselect and reselect this object and trigger an enterEdit\n return;\n }\n }\n\n if (this.__lastSelected && !this.__corner) {\n this.selected = false;\n this.__lastSelected = false;\n this.enterEditing(options.e);\n\n if (this.selectionStart === this.selectionEnd) {\n this.initDelayedCursor(true);\n } else {\n this.renderCursorOrSelection();\n }\n } else {\n this.selected = true;\n }\n },\n\n /**\n * Changes cursor location in a text depending on passed pointer (x/y) object\n * @param {Event} e Event object\n */\n setCursorByClick: function (e) {\n var newSelection = this.getSelectionStartFromPointer(e),\n start = this.selectionStart,\n end = this.selectionEnd;\n\n if (e.shiftKey) {\n this.setSelectionStartEndWithShift(start, end, newSelection);\n } else {\n this.selectionStart = newSelection;\n this.selectionEnd = newSelection;\n }\n\n if (this.isEditing) {\n this._fireSelectionChanged();\n\n this._updateTextarea();\n }\n },\n\n /**\n * Returns index of a character corresponding to where an object was clicked\n * @param {Event} e Event object\n * @return {Number} Index of a character\n */\n getSelectionStartFromPointer: function (e) {\n var mouseOffset = this.getLocalPointer(e),\n prevWidth = 0,\n width = 0,\n height = 0,\n charIndex = 0,\n lineIndex = 0,\n lineLeftOffset,\n line;\n\n for (var i = 0, len = this._textLines.length; i < len; i++) {\n if (height <= mouseOffset.y) {\n height += this.getHeightOfLine(i) * this.scaleY;\n lineIndex = i;\n\n if (i > 0) {\n charIndex += this._textLines[i - 1].length + this.missingNewlineOffset(i - 1);\n }\n } else {\n break;\n }\n }\n\n lineLeftOffset = this._getLineLeftOffset(lineIndex);\n width = lineLeftOffset * this.scaleX;\n line = this._textLines[lineIndex];\n\n for (var j = 0, jlen = line.length; j < jlen; j++) {\n prevWidth = width; // i removed something about flipX here, check.\n\n width += this.__charBounds[lineIndex][j].kernedWidth * this.scaleX;\n\n if (width <= mouseOffset.x) {\n charIndex++;\n } else {\n break;\n }\n }\n\n return this._getNewSelectionStartFromOffset(mouseOffset, prevWidth, width, charIndex, jlen);\n },\n\n /**\n * @private\n */\n _getNewSelectionStartFromOffset: function (mouseOffset, prevWidth, width, index, jlen) {\n // we need Math.abs because when width is after the last char, the offset is given as 1, while is 0\n var distanceBtwLastCharAndCursor = mouseOffset.x - prevWidth,\n distanceBtwNextCharAndCursor = width - mouseOffset.x,\n offset = distanceBtwNextCharAndCursor > distanceBtwLastCharAndCursor || distanceBtwNextCharAndCursor < 0 ? 0 : 1,\n newSelectionStart = index + offset; // if object is horizontally flipped, mirror cursor location from the end\n\n if (this.flipX) {\n newSelectionStart = jlen - newSelectionStart;\n }\n\n if (newSelectionStart > this._text.length) {\n newSelectionStart = this._text.length;\n }\n\n return newSelectionStart;\n }\n});\nfabric.util.object.extend(fabric.IText.prototype,\n/** @lends fabric.IText.prototype */\n{\n /**\n * Initializes hidden textarea (needed to bring up keyboard in iOS)\n */\n initHiddenTextarea: function () {\n this.hiddenTextarea = fabric.document.createElement('textarea');\n this.hiddenTextarea.setAttribute('autocapitalize', 'off');\n this.hiddenTextarea.setAttribute('autocorrect', 'off');\n this.hiddenTextarea.setAttribute('autocomplete', 'off');\n this.hiddenTextarea.setAttribute('spellcheck', 'false');\n this.hiddenTextarea.setAttribute('data-fabric-hiddentextarea', '');\n this.hiddenTextarea.setAttribute('wrap', 'off');\n\n var style = this._calcTextareaPosition(); // line-height: 1px; was removed from the style to fix this:\n // https://bugs.chromium.org/p/chromium/issues/detail?id=870966\n\n\n this.hiddenTextarea.style.cssText = 'position: absolute; top: ' + style.top + '; left: ' + style.left + '; z-index: -999; opacity: 0; width: 1px; height: 1px; font-size: 1px;' + ' paddingｰtop: ' + style.fontSize + ';';\n fabric.document.body.appendChild(this.hiddenTextarea);\n fabric.util.addListener(this.hiddenTextarea, 'keydown', this.onKeyDown.bind(this));\n fabric.util.addListener(this.hiddenTextarea, 'keyup', this.onKeyUp.bind(this));\n fabric.util.addListener(this.hiddenTextarea, 'input', this.onInput.bind(this));\n fabric.util.addListener(this.hiddenTextarea, 'copy', this.copy.bind(this));\n fabric.util.addListener(this.hiddenTextarea, 'cut', this.copy.bind(this));\n fabric.util.addListener(this.hiddenTextarea, 'paste', this.paste.bind(this));\n fabric.util.addListener(this.hiddenTextarea, 'compositionstart', this.onCompositionStart.bind(this));\n fabric.util.addListener(this.hiddenTextarea, 'compositionupdate', this.onCompositionUpdate.bind(this));\n fabric.util.addListener(this.hiddenTextarea, 'compositionend', this.onCompositionEnd.bind(this));\n\n if (!this._clickHandlerInitialized && this.canvas) {\n fabric.util.addListener(this.canvas.upperCanvasEl, 'click', this.onClick.bind(this));\n this._clickHandlerInitialized = true;\n }\n },\n\n /**\n * For functionalities on keyDown\n * Map a special key to a function of the instance/prototype\n * If you need different behaviour for ESC or TAB or arrows, you have to change\n * this map setting the name of a function that you build on the fabric.Itext or\n * your prototype.\n * the map change will affect all Instances unless you need for only some text Instances\n * in that case you have to clone this object and assign your Instance.\n * this.keysMap = fabric.util.object.clone(this.keysMap);\n * The function must be in fabric.Itext.prototype.myFunction And will receive event as args[0]\n */\n keysMap: {\n 9: 'exitEditing',\n 27: 'exitEditing',\n 33: 'moveCursorUp',\n 34: 'moveCursorDown',\n 35: 'moveCursorRight',\n 36: 'moveCursorLeft',\n 37: 'moveCursorLeft',\n 38: 'moveCursorUp',\n 39: 'moveCursorRight',\n 40: 'moveCursorDown'\n },\n\n /**\n * For functionalities on keyUp + ctrl || cmd\n */\n ctrlKeysMapUp: {\n 67: 'copy',\n 88: 'cut'\n },\n\n /**\n * For functionalities on keyDown + ctrl || cmd\n */\n ctrlKeysMapDown: {\n 65: 'selectAll'\n },\n onClick: function () {\n // No need to trigger click event here, focus is enough to have the keyboard appear on Android\n this.hiddenTextarea && this.hiddenTextarea.focus();\n },\n\n /**\n * Handles keydown event\n * only used for arrows and combination of modifier keys.\n * @param {Event} e Event object\n */\n onKeyDown: function (e) {\n if (!this.isEditing) {\n return;\n }\n\n if (e.keyCode in this.keysMap) {\n this[this.keysMap[e.keyCode]](e);\n } else if (e.keyCode in this.ctrlKeysMapDown && (e.ctrlKey || e.metaKey)) {\n this[this.ctrlKeysMapDown[e.keyCode]](e);\n } else {\n return;\n }\n\n e.stopImmediatePropagation();\n e.preventDefault();\n\n if (e.keyCode >= 33 && e.keyCode <= 40) {\n // if i press an arrow key just update selection\n this.inCompositionMode = false;\n this.clearContextTop();\n this.renderCursorOrSelection();\n } else {\n this.canvas && this.canvas.requestRenderAll();\n }\n },\n\n /**\n * Handles keyup event\n * We handle KeyUp because ie11 and edge have difficulties copy/pasting\n * if a copy/cut event fired, keyup is dismissed\n * @param {Event} e Event object\n */\n onKeyUp: function (e) {\n if (!this.isEditing || this._copyDone || this.inCompositionMode) {\n this._copyDone = false;\n return;\n }\n\n if (e.keyCode in this.ctrlKeysMapUp && (e.ctrlKey || e.metaKey)) {\n this[this.ctrlKeysMapUp[e.keyCode]](e);\n } else {\n return;\n }\n\n e.stopImmediatePropagation();\n e.preventDefault();\n this.canvas && this.canvas.requestRenderAll();\n },\n\n /**\n * Handles onInput event\n * @param {Event} e Event object\n */\n onInput: function (e) {\n var fromPaste = this.fromPaste;\n this.fromPaste = false;\n e && e.stopPropagation();\n\n if (!this.isEditing) {\n return;\n } // decisions about style changes.\n\n\n var nextText = this._splitTextIntoLines(this.hiddenTextarea.value).graphemeText,\n charCount = this._text.length,\n nextCharCount = nextText.length,\n removedText,\n insertedText,\n charDiff = nextCharCount - charCount,\n selectionStart = this.selectionStart,\n selectionEnd = this.selectionEnd,\n selection = selectionStart !== selectionEnd,\n copiedStyle,\n removeFrom,\n removeTo;\n\n if (this.hiddenTextarea.value === '') {\n this.styles = {};\n this.updateFromTextArea();\n this.fire('changed');\n\n if (this.canvas) {\n this.canvas.fire('text:changed', {\n target: this\n });\n this.canvas.requestRenderAll();\n }\n\n return;\n }\n\n var textareaSelection = this.fromStringToGraphemeSelection(this.hiddenTextarea.selectionStart, this.hiddenTextarea.selectionEnd, this.hiddenTextarea.value);\n var backDelete = selectionStart > textareaSelection.selectionStart;\n\n if (selection) {\n removedText = this._text.slice(selectionStart, selectionEnd);\n charDiff += selectionEnd - selectionStart;\n } else if (nextCharCount < charCount) {\n if (backDelete) {\n removedText = this._text.slice(selectionEnd + charDiff, selectionEnd);\n } else {\n removedText = this._text.slice(selectionStart, selectionStart - charDiff);\n }\n }\n\n insertedText = nextText.slice(textareaSelection.selectionEnd - charDiff, textareaSelection.selectionEnd);\n\n if (removedText && removedText.length) {\n if (insertedText.length) {\n // let's copy some style before deleting.\n // we want to copy the style before the cursor OR the style at the cursor if selection\n // is bigger than 0.\n copiedStyle = this.getSelectionStyles(selectionStart, selectionStart + 1, false); // now duplicate the style one for each inserted text.\n\n copiedStyle = insertedText.map(function () {\n // this return an array of references, but that is fine since we are\n // copying the style later.\n return copiedStyle[0];\n });\n }\n\n if (selection) {\n removeFrom = selectionStart;\n removeTo = selectionEnd;\n } else if (backDelete) {\n // detect differencies between forwardDelete and backDelete\n removeFrom = selectionEnd - removedText.length;\n removeTo = selectionEnd;\n } else {\n removeFrom = selectionEnd;\n removeTo = selectionEnd + removedText.length;\n }\n\n this.removeStyleFromTo(removeFrom, removeTo);\n }\n\n if (insertedText.length) {\n if (fromPaste && insertedText.join('') === fabric.copiedText && !fabric.disableStyleCopyPaste) {\n copiedStyle = fabric.copiedTextStyle;\n }\n\n this.insertNewStyleBlock(insertedText, selectionStart, copiedStyle);\n }\n\n this.updateFromTextArea();\n this.fire('changed');\n\n if (this.canvas) {\n this.canvas.fire('text:changed', {\n target: this\n });\n this.canvas.requestRenderAll();\n }\n },\n\n /**\n * Composition start\n */\n onCompositionStart: function () {\n this.inCompositionMode = true;\n },\n\n /**\n * Composition end\n */\n onCompositionEnd: function () {\n this.inCompositionMode = false;\n },\n // /**\n // * Composition update\n // */\n onCompositionUpdate: function (e) {\n this.compositionStart = e.target.selectionStart;\n this.compositionEnd = e.target.selectionEnd;\n this.updateTextareaPosition();\n },\n\n /**\n * Copies selected text\n * @param {Event} e Event object\n */\n copy: function () {\n if (this.selectionStart === this.selectionEnd) {\n //do not cut-copy if no selection\n return;\n }\n\n fabric.copiedText = this.getSelectedText();\n\n if (!fabric.disableStyleCopyPaste) {\n fabric.copiedTextStyle = this.getSelectionStyles(this.selectionStart, this.selectionEnd, true);\n } else {\n fabric.copiedTextStyle = null;\n }\n\n this._copyDone = true;\n },\n\n /**\n * Pastes text\n * @param {Event} e Event object\n */\n paste: function () {\n this.fromPaste = true;\n },\n\n /**\n * @private\n * @param {Event} e Event object\n * @return {Object} Clipboard data object\n */\n _getClipboardData: function (e) {\n return e && e.clipboardData || fabric.window.clipboardData;\n },\n\n /**\n * Finds the width in pixels before the cursor on the same line\n * @private\n * @param {Number} lineIndex\n * @param {Number} charIndex\n * @return {Number} widthBeforeCursor width before cursor\n */\n _getWidthBeforeCursor: function (lineIndex, charIndex) {\n var widthBeforeCursor = this._getLineLeftOffset(lineIndex),\n bound;\n\n if (charIndex > 0) {\n bound = this.__charBounds[lineIndex][charIndex - 1];\n widthBeforeCursor += bound.left + bound.width;\n }\n\n return widthBeforeCursor;\n },\n\n /**\n * Gets start offset of a selection\n * @param {Event} e Event object\n * @param {Boolean} isRight\n * @return {Number}\n */\n getDownCursorOffset: function (e, isRight) {\n var selectionProp = this._getSelectionForOffset(e, isRight),\n cursorLocation = this.get2DCursorLocation(selectionProp),\n lineIndex = cursorLocation.lineIndex; // if on last line, down cursor goes to end of line\n\n\n if (lineIndex === this._textLines.length - 1 || e.metaKey || e.keyCode === 34) {\n // move to the end of a text\n return this._text.length - selectionProp;\n }\n\n var charIndex = cursorLocation.charIndex,\n widthBeforeCursor = this._getWidthBeforeCursor(lineIndex, charIndex),\n indexOnOtherLine = this._getIndexOnLine(lineIndex + 1, widthBeforeCursor),\n textAfterCursor = this._textLines[lineIndex].slice(charIndex);\n\n return textAfterCursor.length + indexOnOtherLine + 1 + this.missingNewlineOffset(lineIndex);\n },\n\n /**\n * private\n * Helps finding if the offset should be counted from Start or End\n * @param {Event} e Event object\n * @param {Boolean} isRight\n * @return {Number}\n */\n _getSelectionForOffset: function (e, isRight) {\n if (e.shiftKey && this.selectionStart !== this.selectionEnd && isRight) {\n return this.selectionEnd;\n } else {\n return this.selectionStart;\n }\n },\n\n /**\n * @param {Event} e Event object\n * @param {Boolean} isRight\n * @return {Number}\n */\n getUpCursorOffset: function (e, isRight) {\n var selectionProp = this._getSelectionForOffset(e, isRight),\n cursorLocation = this.get2DCursorLocation(selectionProp),\n lineIndex = cursorLocation.lineIndex;\n\n if (lineIndex === 0 || e.metaKey || e.keyCode === 33) {\n // if on first line, up cursor goes to start of line\n return -selectionProp;\n }\n\n var charIndex = cursorLocation.charIndex,\n widthBeforeCursor = this._getWidthBeforeCursor(lineIndex, charIndex),\n indexOnOtherLine = this._getIndexOnLine(lineIndex - 1, widthBeforeCursor),\n textBeforeCursor = this._textLines[lineIndex].slice(0, charIndex),\n missingNewlineOffset = this.missingNewlineOffset(lineIndex - 1); // return a negative offset\n\n\n return -this._textLines[lineIndex - 1].length + indexOnOtherLine - textBeforeCursor.length + (1 - missingNewlineOffset);\n },\n\n /**\n * for a given width it founds the matching character.\n * @private\n */\n _getIndexOnLine: function (lineIndex, width) {\n var line = this._textLines[lineIndex],\n lineLeftOffset = this._getLineLeftOffset(lineIndex),\n widthOfCharsOnLine = lineLeftOffset,\n indexOnLine = 0,\n charWidth,\n foundMatch;\n\n for (var j = 0, jlen = line.length; j < jlen; j++) {\n charWidth = this.__charBounds[lineIndex][j].width;\n widthOfCharsOnLine += charWidth;\n\n if (widthOfCharsOnLine > width) {\n foundMatch = true;\n var leftEdge = widthOfCharsOnLine - charWidth,\n rightEdge = widthOfCharsOnLine,\n offsetFromLeftEdge = Math.abs(leftEdge - width),\n offsetFromRightEdge = Math.abs(rightEdge - width);\n indexOnLine = offsetFromRightEdge < offsetFromLeftEdge ? j : j - 1;\n break;\n }\n } // reached end\n\n\n if (!foundMatch) {\n indexOnLine = line.length - 1;\n }\n\n return indexOnLine;\n },\n\n /**\n * Moves cursor down\n * @param {Event} e Event object\n */\n moveCursorDown: function (e) {\n if (this.selectionStart >= this._text.length && this.selectionEnd >= this._text.length) {\n return;\n }\n\n this._moveCursorUpOrDown('Down', e);\n },\n\n /**\n * Moves cursor up\n * @param {Event} e Event object\n */\n moveCursorUp: function (e) {\n if (this.selectionStart === 0 && this.selectionEnd === 0) {\n return;\n }\n\n this._moveCursorUpOrDown('Up', e);\n },\n\n /**\n * Moves cursor up or down, fires the events\n * @param {String} direction 'Up' or 'Down'\n * @param {Event} e Event object\n */\n _moveCursorUpOrDown: function (direction, e) {\n // getUpCursorOffset\n // getDownCursorOffset\n var action = 'get' + direction + 'CursorOffset',\n offset = this[action](e, this._selectionDirection === 'right');\n\n if (e.shiftKey) {\n this.moveCursorWithShift(offset);\n } else {\n this.moveCursorWithoutShift(offset);\n }\n\n if (offset !== 0) {\n this.setSelectionInBoundaries();\n this.abortCursorAnimation();\n this._currentCursorOpacity = 1;\n this.initDelayedCursor();\n\n this._fireSelectionChanged();\n\n this._updateTextarea();\n }\n },\n\n /**\n * Moves cursor with shift\n * @param {Number} offset\n */\n moveCursorWithShift: function (offset) {\n var newSelection = this._selectionDirection === 'left' ? this.selectionStart + offset : this.selectionEnd + offset;\n this.setSelectionStartEndWithShift(this.selectionStart, this.selectionEnd, newSelection);\n return offset !== 0;\n },\n\n /**\n * Moves cursor up without shift\n * @param {Number} offset\n */\n moveCursorWithoutShift: function (offset) {\n if (offset < 0) {\n this.selectionStart += offset;\n this.selectionEnd = this.selectionStart;\n } else {\n this.selectionEnd += offset;\n this.selectionStart = this.selectionEnd;\n }\n\n return offset !== 0;\n },\n\n /**\n * Moves cursor left\n * @param {Event} e Event object\n */\n moveCursorLeft: function (e) {\n if (this.selectionStart === 0 && this.selectionEnd === 0) {\n return;\n }\n\n this._moveCursorLeftOrRight('Left', e);\n },\n\n /**\n * @private\n * @return {Boolean} true if a change happened\n */\n _move: function (e, prop, direction) {\n var newValue;\n\n if (e.altKey) {\n newValue = this['findWordBoundary' + direction](this[prop]);\n } else if (e.metaKey || e.keyCode === 35 || e.keyCode === 36) {\n newValue = this['findLineBoundary' + direction](this[prop]);\n } else {\n this[prop] += direction === 'Left' ? -1 : 1;\n return true;\n }\n\n if (typeof newValue !== undefined && this[prop] !== newValue) {\n this[prop] = newValue;\n return true;\n }\n },\n\n /**\n * @private\n */\n _moveLeft: function (e, prop) {\n return this._move(e, prop, 'Left');\n },\n\n /**\n * @private\n */\n _moveRight: function (e, prop) {\n return this._move(e, prop, 'Right');\n },\n\n /**\n * Moves cursor left without keeping selection\n * @param {Event} e\n */\n moveCursorLeftWithoutShift: function (e) {\n var change = true;\n this._selectionDirection = 'left'; // only move cursor when there is no selection,\n // otherwise we discard it, and leave cursor on same place\n\n if (this.selectionEnd === this.selectionStart && this.selectionStart !== 0) {\n change = this._moveLeft(e, 'selectionStart');\n }\n\n this.selectionEnd = this.selectionStart;\n return change;\n },\n\n /**\n * Moves cursor left while keeping selection\n * @param {Event} e\n */\n moveCursorLeftWithShift: function (e) {\n if (this._selectionDirection === 'right' && this.selectionStart !== this.selectionEnd) {\n return this._moveLeft(e, 'selectionEnd');\n } else if (this.selectionStart !== 0) {\n this._selectionDirection = 'left';\n return this._moveLeft(e, 'selectionStart');\n }\n },\n\n /**\n * Moves cursor right\n * @param {Event} e Event object\n */\n moveCursorRight: function (e) {\n if (this.selectionStart >= this._text.length && this.selectionEnd >= this._text.length) {\n return;\n }\n\n this._moveCursorLeftOrRight('Right', e);\n },\n\n /**\n * Moves cursor right or Left, fires event\n * @param {String} direction 'Left', 'Right'\n * @param {Event} e Event object\n */\n _moveCursorLeftOrRight: function (direction, e) {\n var actionName = 'moveCursor' + direction + 'With';\n this._currentCursorOpacity = 1;\n\n if (e.shiftKey) {\n actionName += 'Shift';\n } else {\n actionName += 'outShift';\n }\n\n if (this[actionName](e)) {\n this.abortCursorAnimation();\n this.initDelayedCursor();\n\n this._fireSelectionChanged();\n\n this._updateTextarea();\n }\n },\n\n /**\n * Moves cursor right while keeping selection\n * @param {Event} e\n */\n moveCursorRightWithShift: function (e) {\n if (this._selectionDirection === 'left' && this.selectionStart !== this.selectionEnd) {\n return this._moveRight(e, 'selectionStart');\n } else if (this.selectionEnd !== this._text.length) {\n this._selectionDirection = 'right';\n return this._moveRight(e, 'selectionEnd');\n }\n },\n\n /**\n * Moves cursor right without keeping selection\n * @param {Event} e Event object\n */\n moveCursorRightWithoutShift: function (e) {\n var changed = true;\n this._selectionDirection = 'right';\n\n if (this.selectionStart === this.selectionEnd) {\n changed = this._moveRight(e, 'selectionStart');\n this.selectionEnd = this.selectionStart;\n } else {\n this.selectionStart = this.selectionEnd;\n }\n\n return changed;\n },\n\n /**\n * Removes characters from start/end\n * start/end ar per grapheme position in _text array.\n *\n * @param {Number} start\n * @param {Number} end default to start + 1\n */\n removeChars: function (start, end) {\n if (typeof end === 'undefined') {\n end = start + 1;\n }\n\n this.removeStyleFromTo(start, end);\n\n this._text.splice(start, end - start);\n\n this.text = this._text.join('');\n this.set('dirty', true);\n\n if (this._shouldClearDimensionCache()) {\n this.initDimensions();\n this.setCoords();\n }\n\n this._removeExtraneousStyles();\n },\n\n /**\n * insert characters at start position, before start position.\n * start equal 1 it means the text get inserted between actual grapheme 0 and 1\n * if style array is provided, it must be as the same length of text in graphemes\n * if end is provided and is bigger than start, old text is replaced.\n * start/end ar per grapheme position in _text array.\n *\n * @param {String} text text to insert\n * @param {Array} style array of style objects\n * @param {Number} start\n * @param {Number} end default to start + 1\n */\n insertChars: function (text, style, start, end) {\n if (typeof end === 'undefined') {\n end = start;\n }\n\n if (end > start) {\n this.removeStyleFromTo(start, end);\n }\n\n var graphemes = fabric.util.string.graphemeSplit(text);\n this.insertNewStyleBlock(graphemes, start, style);\n this._text = [].concat(this._text.slice(0, start), graphemes, this._text.slice(end));\n this.text = this._text.join('');\n this.set('dirty', true);\n\n if (this._shouldClearDimensionCache()) {\n this.initDimensions();\n this.setCoords();\n }\n\n this._removeExtraneousStyles();\n }\n});\n/* _TO_SVG_START_ */\n\n(function () {\n var toFixed = fabric.util.toFixed,\n multipleSpacesRegex = / +/g;\n fabric.util.object.extend(fabric.Text.prototype,\n /** @lends fabric.Text.prototype */\n {\n /**\n * Returns SVG representation of an instance\n * @param {Function} [reviver] Method for further parsing of svg representation.\n * @return {String} svg representation of an instance\n */\n _toSVG: function () {\n var offsets = this._getSVGLeftTopOffsets(),\n textAndBg = this._getSVGTextAndBg(offsets.textTop, offsets.textLeft);\n\n return this._wrapSVGTextAndBg(textAndBg);\n },\n\n /**\n * Returns svg representation of an instance\n * @param {Function} [reviver] Method for further parsing of svg representation.\n * @return {String} svg representation of an instance\n */\n toSVG: function (reviver) {\n return this._createBaseSVGMarkup(this._toSVG(), {\n reviver: reviver,\n noStyle: true,\n withShadow: true\n });\n },\n\n /**\n * @private\n */\n _getSVGLeftTopOffsets: function () {\n return {\n textLeft: -this.width / 2,\n textTop: -this.height / 2,\n lineTop: this.getHeightOfLine(0)\n };\n },\n\n /**\n * @private\n */\n _wrapSVGTextAndBg: function (textAndBg) {\n var noShadow = true,\n textDecoration = this.getSvgTextDecoration(this);\n return [textAndBg.textBgRects.join(''), '\\t\\t<text xml:space=\"preserve\" ', this.fontFamily ? 'font-family=\"' + this.fontFamily.replace(/\"/g, '\\'') + '\" ' : '', this.fontSize ? 'font-size=\"' + this.fontSize + '\" ' : '', this.fontStyle ? 'font-style=\"' + this.fontStyle + '\" ' : '', this.fontWeight ? 'font-weight=\"' + this.fontWeight + '\" ' : '', textDecoration ? 'text-decoration=\"' + textDecoration + '\" ' : '', 'style=\"', this.getSvgStyles(noShadow), '\"', this.addPaintOrder(), ' >', textAndBg.textSpans.join(''), '</text>\\n'];\n },\n\n /**\n * @private\n * @param {Number} textTopOffset Text top offset\n * @param {Number} textLeftOffset Text left offset\n * @return {Object}\n */\n _getSVGTextAndBg: function (textTopOffset, textLeftOffset) {\n var textSpans = [],\n textBgRects = [],\n height = textTopOffset,\n lineOffset; // bounding-box background\n\n this._setSVGBg(textBgRects); // text and text-background\n\n\n for (var i = 0, len = this._textLines.length; i < len; i++) {\n lineOffset = this._getLineLeftOffset(i);\n\n if (this.textBackgroundColor || this.styleHas('textBackgroundColor', i)) {\n this._setSVGTextLineBg(textBgRects, i, textLeftOffset + lineOffset, height);\n }\n\n this._setSVGTextLineText(textSpans, i, textLeftOffset + lineOffset, height);\n\n height += this.getHeightOfLine(i);\n }\n\n return {\n textSpans: textSpans,\n textBgRects: textBgRects\n };\n },\n\n /**\n * @private\n */\n _createTextCharSpan: function (_char, styleDecl, left, top) {\n var shouldUseWhitespace = _char !== _char.trim() || _char.match(multipleSpacesRegex),\n styleProps = this.getSvgSpanStyles(styleDecl, shouldUseWhitespace),\n fillStyles = styleProps ? 'style=\"' + styleProps + '\"' : '',\n dy = styleDecl.deltaY,\n dySpan = '',\n NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS;\n\n if (dy) {\n dySpan = ' dy=\"' + toFixed(dy, NUM_FRACTION_DIGITS) + '\" ';\n }\n\n return ['<tspan x=\"', toFixed(left, NUM_FRACTION_DIGITS), '\" y=\"', toFixed(top, NUM_FRACTION_DIGITS), '\" ', dySpan, fillStyles, '>', fabric.util.string.escapeXml(_char), '</tspan>'].join('');\n },\n _setSVGTextLineText: function (textSpans, lineIndex, textLeftOffset, textTopOffset) {\n // set proper line offset\n var lineHeight = this.getHeightOfLine(lineIndex),\n isJustify = this.textAlign.indexOf('justify') !== -1,\n actualStyle,\n nextStyle,\n charsToRender = '',\n charBox,\n style,\n boxWidth = 0,\n line = this._textLines[lineIndex],\n timeToRender;\n textTopOffset += lineHeight * (1 - this._fontSizeFraction) / this.lineHeight;\n\n for (var i = 0, len = line.length - 1; i <= len; i++) {\n timeToRender = i === len || this.charSpacing;\n charsToRender += line[i];\n charBox = this.__charBounds[lineIndex][i];\n\n if (boxWidth === 0) {\n textLeftOffset += charBox.kernedWidth - charBox.width;\n boxWidth += charBox.width;\n } else {\n boxWidth += charBox.kernedWidth;\n }\n\n if (isJustify && !timeToRender) {\n if (this._reSpaceAndTab.test(line[i])) {\n timeToRender = true;\n }\n }\n\n if (!timeToRender) {\n // if we have charSpacing, we render char by char\n actualStyle = actualStyle || this.getCompleteStyleDeclaration(lineIndex, i);\n nextStyle = this.getCompleteStyleDeclaration(lineIndex, i + 1);\n timeToRender = this._hasStyleChangedForSvg(actualStyle, nextStyle);\n }\n\n if (timeToRender) {\n style = this._getStyleDeclaration(lineIndex, i) || {};\n textSpans.push(this._createTextCharSpan(charsToRender, style, textLeftOffset, textTopOffset));\n charsToRender = '';\n actualStyle = nextStyle;\n textLeftOffset += boxWidth;\n boxWidth = 0;\n }\n }\n },\n _pushTextBgRect: function (textBgRects, color, left, top, width, height) {\n var NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS;\n textBgRects.push('\\t\\t<rect ', this._getFillAttributes(color), ' x=\"', toFixed(left, NUM_FRACTION_DIGITS), '\" y=\"', toFixed(top, NUM_FRACTION_DIGITS), '\" width=\"', toFixed(width, NUM_FRACTION_DIGITS), '\" height=\"', toFixed(height, NUM_FRACTION_DIGITS), '\"></rect>\\n');\n },\n _setSVGTextLineBg: function (textBgRects, i, leftOffset, textTopOffset) {\n var line = this._textLines[i],\n heightOfLine = this.getHeightOfLine(i) / this.lineHeight,\n boxWidth = 0,\n boxStart = 0,\n charBox,\n currentColor,\n lastColor = this.getValueOfPropertyAt(i, 0, 'textBackgroundColor');\n\n for (var j = 0, jlen = line.length; j < jlen; j++) {\n charBox = this.__charBounds[i][j];\n currentColor = this.getValueOfPropertyAt(i, j, 'textBackgroundColor');\n\n if (currentColor !== lastColor) {\n lastColor && this._pushTextBgRect(textBgRects, lastColor, leftOffset + boxStart, textTopOffset, boxWidth, heightOfLine);\n boxStart = charBox.left;\n boxWidth = charBox.width;\n lastColor = currentColor;\n } else {\n boxWidth += charBox.kernedWidth;\n }\n }\n\n currentColor && this._pushTextBgRect(textBgRects, currentColor, leftOffset + boxStart, textTopOffset, boxWidth, heightOfLine);\n },\n\n /**\n * Adobe Illustrator (at least CS5) is unable to render rgba()-based fill values\n * we work around it by \"moving\" alpha channel into opacity attribute and setting fill's alpha to 1\n *\n * @private\n * @param {*} value\n * @return {String}\n */\n _getFillAttributes: function (value) {\n var fillColor = value && typeof value === 'string' ? new fabric.Color(value) : '';\n\n if (!fillColor || !fillColor.getSource() || fillColor.getAlpha() === 1) {\n return 'fill=\"' + value + '\"';\n }\n\n return 'opacity=\"' + fillColor.getAlpha() + '\" fill=\"' + fillColor.setAlpha(1).toRgb() + '\"';\n },\n\n /**\n * @private\n */\n _getSVGLineTopOffset: function (lineIndex) {\n var lineTopOffset = 0,\n lastHeight = 0;\n\n for (var j = 0; j < lineIndex; j++) {\n lineTopOffset += this.getHeightOfLine(j);\n }\n\n lastHeight = this.getHeightOfLine(j);\n return {\n lineTop: lineTopOffset,\n offset: (this._fontSizeMult - this._fontSizeFraction) * lastHeight / (this.lineHeight * this._fontSizeMult)\n };\n },\n\n /**\n * Returns styles-string for svg-export\n * @param {Boolean} skipShadow a boolean to skip shadow filter output\n * @return {String}\n */\n getSvgStyles: function (skipShadow) {\n var svgStyle = fabric.Object.prototype.getSvgStyles.call(this, skipShadow);\n return svgStyle + ' white-space: pre;';\n }\n });\n})();\n/* _TO_SVG_END_ */\n\n\n(function (global) {\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {});\n /**\n * Textbox class, based on IText, allows the user to resize the text rectangle\n * and wraps lines automatically. Textboxes have their Y scaling locked, the\n * user can only change width. Height is adjusted automatically based on the\n * wrapping of lines.\n * @class fabric.Textbox\n * @extends fabric.IText\n * @mixes fabric.Observable\n * @return {fabric.Textbox} thisArg\n * @see {@link fabric.Textbox#initialize} for constructor definition\n */\n\n fabric.Textbox = fabric.util.createClass(fabric.IText, fabric.Observable, {\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'textbox',\n\n /**\n * Minimum width of textbox, in pixels.\n * @type Number\n * @default\n */\n minWidth: 20,\n\n /**\n * Minimum calculated width of a textbox, in pixels.\n * fixed to 2 so that an empty textbox cannot go to 0\n * and is still selectable without text.\n * @type Number\n * @default\n */\n dynamicMinWidth: 2,\n\n /**\n * Cached array of text wrapping.\n * @type Array\n */\n __cachedLines: null,\n\n /**\n * Override standard Object class values\n */\n lockScalingFlip: true,\n\n /**\n * Override standard Object class values\n * Textbox needs this on false\n */\n noScaleCache: false,\n\n /**\n * Properties which when set cause object to change dimensions\n * @type Object\n * @private\n */\n _dimensionAffectingProps: fabric.Text.prototype._dimensionAffectingProps.concat('width'),\n\n /**\n * Use this regular expression to split strings in breakable lines\n * @private\n */\n _wordJoiners: /[ \\t\\r]/,\n\n /**\n * Use this boolean property in order to split strings that have no white space concept.\n * this is a cheap way to help with chinese/japaense\n * @type Boolean\n * @since 2.6.0\n */\n splitByGrapheme: false,\n\n /**\n * Unlike superclass's version of this function, Textbox does not update\n * its width.\n * @private\n * @override\n */\n initDimensions: function () {\n if (this.__skipDimension) {\n return;\n }\n\n this.isEditing && this.initDelayedCursor();\n this.clearContextTop();\n\n this._clearCache(); // clear dynamicMinWidth as it will be different after we re-wrap line\n\n\n this.dynamicMinWidth = 0; // wrap lines\n\n this._styleMap = this._generateStyleMap(this._splitText()); // if after wrapping, the width is smaller than dynamicMinWidth, change the width and re-wrap\n\n if (this.dynamicMinWidth > this.width) {\n this._set('width', this.dynamicMinWidth);\n }\n\n if (this.textAlign.indexOf('justify') !== -1) {\n // once text is measured we need to make space fatter to make justified text.\n this.enlargeSpaces();\n } // clear cache and re-calculate height\n\n\n this.height = this.calcTextHeight();\n this.saveState({\n propertySet: '_dimensionAffectingProps'\n });\n },\n\n /**\n * Generate an object that translates the style object so that it is\n * broken up by visual lines (new lines and automatic wrapping).\n * The original text styles object is broken up by actual lines (new lines only),\n * which is only sufficient for Text / IText\n * @private\n */\n _generateStyleMap: function (textInfo) {\n var realLineCount = 0,\n realLineCharCount = 0,\n charCount = 0,\n map = {};\n\n for (var i = 0; i < textInfo.graphemeLines.length; i++) {\n if (textInfo.graphemeText[charCount] === '\\n' && i > 0) {\n realLineCharCount = 0;\n charCount++;\n realLineCount++;\n } else if (!this.splitByGrapheme && this._reSpaceAndTab.test(textInfo.graphemeText[charCount]) && i > 0) {\n // this case deals with space's that are removed from end of lines when wrapping\n realLineCharCount++;\n charCount++;\n }\n\n map[i] = {\n line: realLineCount,\n offset: realLineCharCount\n };\n charCount += textInfo.graphemeLines[i].length;\n realLineCharCount += textInfo.graphemeLines[i].length;\n }\n\n return map;\n },\n\n /**\n * Returns true if object has a style property or has it on a specified line\n * @param {Number} lineIndex\n * @return {Boolean}\n */\n styleHas: function (property, lineIndex) {\n if (this._styleMap && !this.isWrapping) {\n var map = this._styleMap[lineIndex];\n\n if (map) {\n lineIndex = map.line;\n }\n }\n\n return fabric.Text.prototype.styleHas.call(this, property, lineIndex);\n },\n\n /**\n * Returns true if object has no styling or no styling in a line\n * @param {Number} lineIndex , lineIndex is on wrapped lines.\n * @return {Boolean}\n */\n isEmptyStyles: function (lineIndex) {\n if (!this.styles) {\n return true;\n }\n\n var offset = 0,\n nextLineIndex = lineIndex + 1,\n nextOffset,\n obj,\n shouldLimit = false,\n map = this._styleMap[lineIndex],\n mapNextLine = this._styleMap[lineIndex + 1];\n\n if (map) {\n lineIndex = map.line;\n offset = map.offset;\n }\n\n if (mapNextLine) {\n nextLineIndex = mapNextLine.line;\n shouldLimit = nextLineIndex === lineIndex;\n nextOffset = mapNextLine.offset;\n }\n\n obj = typeof lineIndex === 'undefined' ? this.styles : {\n line: this.styles[lineIndex]\n };\n\n for (var p1 in obj) {\n for (var p2 in obj[p1]) {\n if (p2 >= offset && (!shouldLimit || p2 < nextOffset)) {\n // eslint-disable-next-line no-unused-vars\n for (var p3 in obj[p1][p2]) {\n return false;\n }\n }\n }\n }\n\n return true;\n },\n\n /**\n * @param {Number} lineIndex\n * @param {Number} charIndex\n * @private\n */\n _getStyleDeclaration: function (lineIndex, charIndex) {\n if (this._styleMap && !this.isWrapping) {\n var map = this._styleMap[lineIndex];\n\n if (!map) {\n return null;\n }\n\n lineIndex = map.line;\n charIndex = map.offset + charIndex;\n }\n\n return this.callSuper('_getStyleDeclaration', lineIndex, charIndex);\n },\n\n /**\n * @param {Number} lineIndex\n * @param {Number} charIndex\n * @param {Object} style\n * @private\n */\n _setStyleDeclaration: function (lineIndex, charIndex, style) {\n var map = this._styleMap[lineIndex];\n lineIndex = map.line;\n charIndex = map.offset + charIndex;\n this.styles[lineIndex][charIndex] = style;\n },\n\n /**\n * @param {Number} lineIndex\n * @param {Number} charIndex\n * @private\n */\n _deleteStyleDeclaration: function (lineIndex, charIndex) {\n var map = this._styleMap[lineIndex];\n lineIndex = map.line;\n charIndex = map.offset + charIndex;\n delete this.styles[lineIndex][charIndex];\n },\n\n /**\n * probably broken need a fix\n * Returns the real style line that correspond to the wrapped lineIndex line\n * Used just to verify if the line does exist or not.\n * @param {Number} lineIndex\n * @returns {Boolean} if the line exists or not\n * @private\n */\n _getLineStyle: function (lineIndex) {\n var map = this._styleMap[lineIndex];\n return !!this.styles[map.line];\n },\n\n /**\n * Set the line style to an empty object so that is initialized\n * @param {Number} lineIndex\n * @param {Object} style\n * @private\n */\n _setLineStyle: function (lineIndex) {\n var map = this._styleMap[lineIndex];\n this.styles[map.line] = {};\n },\n\n /**\n * Wraps text using the 'width' property of Textbox. First this function\n * splits text on newlines, so we preserve newlines entered by the user.\n * Then it wraps each line using the width of the Textbox by calling\n * _wrapLine().\n * @param {Array} lines The string array of text that is split into lines\n * @param {Number} desiredWidth width you want to wrap to\n * @returns {Array} Array of lines\n */\n _wrapText: function (lines, desiredWidth) {\n var wrapped = [],\n i;\n this.isWrapping = true;\n\n for (i = 0; i < lines.length; i++) {\n wrapped = wrapped.concat(this._wrapLine(lines[i], i, desiredWidth));\n }\n\n this.isWrapping = false;\n return wrapped;\n },\n\n /**\n * Helper function to measure a string of text, given its lineIndex and charIndex offset\n * it gets called when charBounds are not available yet.\n * @param {CanvasRenderingContext2D} ctx\n * @param {String} text\n * @param {number} lineIndex\n * @param {number} charOffset\n * @returns {number}\n * @private\n */\n _measureWord: function (word, lineIndex, charOffset) {\n var width = 0,\n prevGrapheme,\n skipLeft = true;\n charOffset = charOffset || 0;\n\n for (var i = 0, len = word.length; i < len; i++) {\n var box = this._getGraphemeBox(word[i], lineIndex, i + charOffset, prevGrapheme, skipLeft);\n\n width += box.kernedWidth;\n prevGrapheme = word[i];\n }\n\n return width;\n },\n\n /**\n * Wraps a line of text using the width of the Textbox and a context.\n * @param {Array} line The grapheme array that represent the line\n * @param {Number} lineIndex\n * @param {Number} desiredWidth width you want to wrap the line to\n * @param {Number} reservedSpace space to remove from wrapping for custom functionalities\n * @returns {Array} Array of line(s) into which the given text is wrapped\n * to.\n */\n _wrapLine: function (_line, lineIndex, desiredWidth, reservedSpace) {\n var lineWidth = 0,\n splitByGrapheme = this.splitByGrapheme,\n graphemeLines = [],\n line = [],\n // spaces in different languges?\n words = splitByGrapheme ? fabric.util.string.graphemeSplit(_line) : _line.split(this._wordJoiners),\n word = '',\n offset = 0,\n infix = splitByGrapheme ? '' : ' ',\n wordWidth = 0,\n infixWidth = 0,\n largestWordWidth = 0,\n lineJustStarted = true,\n additionalSpace = this._getWidthOfCharSpacing(),\n reservedSpace = reservedSpace || 0; // fix a difference between split and graphemeSplit\n\n\n if (words.length === 0) {\n words.push([]);\n }\n\n desiredWidth -= reservedSpace;\n\n for (var i = 0; i < words.length; i++) {\n // if using splitByGrapheme words are already in graphemes.\n word = splitByGrapheme ? words[i] : fabric.util.string.graphemeSplit(words[i]);\n wordWidth = this._measureWord(word, lineIndex, offset);\n offset += word.length;\n lineWidth += infixWidth + wordWidth - additionalSpace;\n\n if (lineWidth >= desiredWidth && !lineJustStarted) {\n graphemeLines.push(line);\n line = [];\n lineWidth = wordWidth;\n lineJustStarted = true;\n } else {\n lineWidth += additionalSpace;\n }\n\n if (!lineJustStarted && !splitByGrapheme) {\n line.push(infix);\n }\n\n line = line.concat(word);\n infixWidth = splitByGrapheme ? 0 : this._measureWord([infix], lineIndex, offset);\n offset++;\n lineJustStarted = false; // keep track of largest word\n\n if (wordWidth > largestWordWidth) {\n largestWordWidth = wordWidth;\n }\n }\n\n i && graphemeLines.push(line);\n\n if (largestWordWidth + reservedSpace > this.dynamicMinWidth) {\n this.dynamicMinWidth = largestWordWidth - additionalSpace + reservedSpace;\n }\n\n return graphemeLines;\n },\n\n /**\n * Detect if the text line is ended with an hard break\n * text and itext do not have wrapping, return false\n * @param {Number} lineIndex text to split\n * @return {Boolean}\n */\n isEndOfWrapping: function (lineIndex) {\n if (!this._styleMap[lineIndex + 1]) {\n // is last line, return true;\n return true;\n }\n\n if (this._styleMap[lineIndex + 1].line !== this._styleMap[lineIndex].line) {\n // this is last line before a line break, return true;\n return true;\n }\n\n return false;\n },\n\n /**\n * Detect if a line has a linebreak and so we need to account for it when moving\n * and counting style.\n * @return Number\n */\n missingNewlineOffset: function (lineIndex) {\n if (this.splitByGrapheme) {\n return this.isEndOfWrapping(lineIndex) ? 1 : 0;\n }\n\n return 1;\n },\n\n /**\n * Gets lines of text to render in the Textbox. This function calculates\n * text wrapping on the fly every time it is called.\n * @param {String} text text to split\n * @returns {Array} Array of lines in the Textbox.\n * @override\n */\n _splitTextIntoLines: function (text) {\n var newText = fabric.Text.prototype._splitTextIntoLines.call(this, text),\n graphemeLines = this._wrapText(newText.lines, this.width),\n lines = new Array(graphemeLines.length);\n\n for (var i = 0; i < graphemeLines.length; i++) {\n lines[i] = graphemeLines[i].join('');\n }\n\n newText.lines = lines;\n newText.graphemeLines = graphemeLines;\n return newText;\n },\n getMinWidth: function () {\n return Math.max(this.minWidth, this.dynamicMinWidth);\n },\n _removeExtraneousStyles: function () {\n var linesToKeep = {};\n\n for (var prop in this._styleMap) {\n if (this._textLines[prop]) {\n linesToKeep[this._styleMap[prop].line] = 1;\n }\n }\n\n for (var prop in this.styles) {\n if (!linesToKeep[prop]) {\n delete this.styles[prop];\n }\n }\n },\n\n /**\n * Returns object representation of an instance\n * @method toObject\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} object representation of an instance\n */\n toObject: function (propertiesToInclude) {\n return this.callSuper('toObject', ['minWidth', 'splitByGrapheme'].concat(propertiesToInclude));\n }\n });\n /**\n * Returns fabric.Textbox instance from an object representation\n * @static\n * @memberOf fabric.Textbox\n * @param {Object} object Object to create an instance from\n * @param {Function} [callback] Callback to invoke when an fabric.Textbox instance is created\n */\n\n fabric.Textbox.fromObject = function (object, callback) {\n return fabric.Object._fromObject('Textbox', object, callback, 'text');\n };\n})(typeof exports !== 'undefined' ? exports : this);\n\n(function () {\n var controlsUtils = fabric.controlsUtils,\n scaleSkewStyleHandler = controlsUtils.scaleSkewCursorStyleHandler,\n scaleStyleHandler = controlsUtils.scaleCursorStyleHandler,\n scalingEqually = controlsUtils.scalingEqually,\n scalingYOrSkewingX = controlsUtils.scalingYOrSkewingX,\n scalingXOrSkewingY = controlsUtils.scalingXOrSkewingY,\n scaleOrSkewActionName = controlsUtils.scaleOrSkewActionName,\n objectControls = fabric.Object.prototype.controls;\n objectControls.ml = new fabric.Control({\n x: -0.5,\n y: 0,\n cursorStyleHandler: scaleSkewStyleHandler,\n actionHandler: scalingXOrSkewingY,\n getActionName: scaleOrSkewActionName\n });\n objectControls.mr = new fabric.Control({\n x: 0.5,\n y: 0,\n cursorStyleHandler: scaleSkewStyleHandler,\n actionHandler: scalingXOrSkewingY,\n getActionName: scaleOrSkewActionName\n });\n objectControls.mb = new fabric.Control({\n x: 0,\n y: 0.5,\n cursorStyleHandler: scaleSkewStyleHandler,\n actionHandler: scalingYOrSkewingX,\n getActionName: scaleOrSkewActionName\n });\n objectControls.mt = new fabric.Control({\n x: 0,\n y: -0.5,\n cursorStyleHandler: scaleSkewStyleHandler,\n actionHandler: scalingYOrSkewingX,\n getActionName: scaleOrSkewActionName\n });\n objectControls.tl = new fabric.Control({\n x: -0.5,\n y: -0.5,\n cursorStyleHandler: scaleStyleHandler,\n actionHandler: scalingEqually\n });\n objectControls.tr = new fabric.Control({\n x: 0.5,\n y: -0.5,\n cursorStyleHandler: scaleStyleHandler,\n actionHandler: scalingEqually\n });\n objectControls.bl = new fabric.Control({\n x: -0.5,\n y: 0.5,\n cursorStyleHandler: scaleStyleHandler,\n actionHandler: scalingEqually\n });\n objectControls.br = new fabric.Control({\n x: 0.5,\n y: 0.5,\n cursorStyleHandler: scaleStyleHandler,\n actionHandler: scalingEqually\n });\n objectControls.mtr = new fabric.Control({\n x: 0,\n y: -0.5,\n actionHandler: controlsUtils.rotationWithSnapping,\n cursorStyleHandler: controlsUtils.rotationStyleHandler,\n offsetY: -40,\n withConnection: true,\n actionName: 'rotate'\n });\n\n if (fabric.Textbox) {\n // this is breaking the prototype inheritance, no time / ideas to fix it.\n // is important to document that if you want to have all objects to have a\n // specific custom control, you have to add it to Object prototype and to Textbox\n // prototype. The controls are shared as references. So changes to control `tr`\n // can still apply to all objects if needed.\n var textBoxControls = fabric.Textbox.prototype.controls = {};\n textBoxControls.mtr = objectControls.mtr;\n textBoxControls.tr = objectControls.tr;\n textBoxControls.br = objectControls.br;\n textBoxControls.tl = objectControls.tl;\n textBoxControls.bl = objectControls.bl;\n textBoxControls.mt = objectControls.mt;\n textBoxControls.mb = objectControls.mb;\n textBoxControls.mr = new fabric.Control({\n x: 0.5,\n y: 0,\n actionHandler: controlsUtils.changeWidth,\n cursorStyleHandler: scaleSkewStyleHandler,\n actionName: 'resizing'\n });\n textBoxControls.ml = new fabric.Control({\n x: -0.5,\n y: 0,\n actionHandler: controlsUtils.changeWidth,\n cursorStyleHandler: scaleSkewStyleHandler,\n actionName: 'resizing'\n });\n 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build: `node build.js modules=ALL exclude=gestures,accessors requirejs minifier=uglifyjs` */\n/*! Fabric.js Copyright 2008-2015, Printio (Juriy Zaytsev, Maxim Chernyak) */\n\nvar fabric = fabric || { version: '4.2.0' };\nif (typeof exports !== 'undefined') {\n exports.fabric = fabric;\n}\n/* _AMD_START_ */\nelse if (typeof define === 'function' && define.amd) {\n define([], function() { return fabric; });\n}\n/* _AMD_END_ */\nif (typeof document !== 'undefined' && typeof window !== 'undefined') {\n if (document instanceof (typeof HTMLDocument !== 'undefined' ? HTMLDocument : Document)) {\n fabric.document = document;\n }\n else {\n fabric.document = document.implementation.createHTMLDocument('');\n }\n fabric.window = window;\n}\nelse {\n // assume we're running under node.js when document/window are not present\n var jsdom = require('jsdom');\n var virtualWindow = new jsdom.JSDOM(\n decodeURIComponent('%3C!DOCTYPE%20html%3E%3Chtml%3E%3Chead%3E%3C%2Fhead%3E%3Cbody%3E%3C%2Fbody%3E%3C%2Fhtml%3E'),\n {\n features: {\n FetchExternalResources: ['img']\n },\n resources: 'usable'\n }).window;\n fabric.document = virtualWindow.document;\n fabric.jsdomImplForWrapper = require('jsdom/lib/jsdom/living/generated/utils').implForWrapper;\n fabric.nodeCanvas = require('jsdom/lib/jsdom/utils').Canvas;\n fabric.window = virtualWindow;\n DOMParser = fabric.window.DOMParser;\n}\n\n/**\n * True when in environment that supports touch events\n * @type boolean\n */\nfabric.isTouchSupported = 'ontouchstart' in fabric.window || 'ontouchstart' in fabric.document ||\n (fabric.window && fabric.window.navigator && fabric.window.navigator.maxTouchPoints > 0);\n\n/**\n * True when in environment that's probably Node.js\n * @type boolean\n */\nfabric.isLikelyNode = typeof Buffer !== 'undefined' &&\n typeof window === 'undefined';\n\n/* _FROM_SVG_START_ */\n/**\n * Attributes parsed from all SVG elements\n * @type array\n */\nfabric.SHARED_ATTRIBUTES = [\n 'display',\n 'transform',\n 'fill', 'fill-opacity', 'fill-rule',\n 'opacity',\n 'stroke', 'stroke-dasharray', 'stroke-linecap', 'stroke-dashoffset',\n 'stroke-linejoin', 'stroke-miterlimit',\n 'stroke-opacity', 'stroke-width',\n 'id', 'paint-order', 'vector-effect',\n 'instantiated_by_use', 'clip-path',\n];\n/* _FROM_SVG_END_ */\n\n/**\n * Pixel per Inch as a default value set to 96. Can be changed for more realistic conversion.\n */\nfabric.DPI = 96;\nfabric.reNum = '(?:[-+]?(?:\\\\d+|\\\\d*\\\\.\\\\d+)(?:[eE][-+]?\\\\d+)?)';\nfabric.commaWsp = '(?:\\\\s+,?\\\\s*|,\\\\s*)'\nfabric.rePathCommand = /([-+]?((\\d+\\.\\d+)|((\\d+)|(\\.\\d+)))(?:[eE][-+]?\\d+)?)/ig;\nfabric.reNonWord = /[ \\n\\.,;!\\?\\-]/;\nfabric.fontPaths = { };\nfabric.iMatrix = [1, 0, 0, 1, 0, 0];\nfabric.svgNS = 'http://www.w3.org/2000/svg';\n\n/**\n * Pixel limit for cache canvases. 1Mpx , 4Mpx should be fine.\n * @since 1.7.14\n * @type Number\n * @default\n */\nfabric.perfLimitSizeTotal = 2097152;\n\n/**\n * Pixel limit for cache canvases width or height. IE fixes the maximum at 5000\n * @since 1.7.14\n * @type Number\n * @default\n */\nfabric.maxCacheSideLimit = 4096;\n\n/**\n * Lowest pixel limit for cache canvases, set at 256PX\n * @since 1.7.14\n * @type Number\n * @default\n */\nfabric.minCacheSideLimit = 256;\n\n/**\n * Cache Object for widths of chars in text rendering.\n */\nfabric.charWidthsCache = { };\n\n/**\n * if webgl is enabled and available, textureSize will determine the size\n * of the canvas backend\n * @since 2.0.0\n * @type Number\n * @default\n */\nfabric.textureSize = 2048;\n\n/**\n * When 'true', style information is not retained when copy/pasting text, making\n * pasted text use destination style.\n * Defaults to 'false'.\n * @type Boolean\n * @default\n */\nfabric.disableStyleCopyPaste = false;\n\n/**\n * Enable webgl for filtering picture is available\n * A filtering backend will be initialized, this will both take memory and\n * time since a default 2048x2048 canvas will be created for the gl context\n * @since 2.0.0\n * @type Boolean\n * @default\n */\nfabric.enableGLFiltering = true;\n\n/**\n * Device Pixel Ratio\n * @see https://developer.apple.com/library/safari/documentation/AudioVideo/Conceptual/HTML-canvas-guide/SettingUptheCanvas/SettingUptheCanvas.html\n */\nfabric.devicePixelRatio = fabric.window.devicePixelRatio ||\n fabric.window.webkitDevicePixelRatio ||\n fabric.window.mozDevicePixelRatio ||\n 1;\n/**\n * Browser-specific constant to adjust CanvasRenderingContext2D.shadowBlur value,\n * which is unitless and not rendered equally across browsers.\n *\n * Values that work quite well (as of October 2017) are:\n * - Chrome: 1.5\n * - Edge: 1.75\n * - Firefox: 0.9\n * - Safari: 0.95\n *\n * @since 2.0.0\n * @type Number\n * @default 1\n */\nfabric.browserShadowBlurConstant = 1;\n\n/**\n * This object contains the result of arc to beizer conversion for faster retrieving if the same arc needs to be converted again.\n * It was an internal variable, is accessible since version 2.3.4\n */\nfabric.arcToSegmentsCache = { };\n\n/**\n * This object keeps the results of the boundsOfCurve calculation mapped by the joined arguments necessary to calculate it.\n * It does speed up calculation, if you parse and add always the same paths, but in case of heavy usage of freedrawing\n * you do not get any speed benefit and you get a big object in memory.\n * The object was a private variable before, while now is appended to the lib so that you have access to it and you\n * can eventually clear it.\n * It was an internal variable, is accessible since version 2.3.4\n */\nfabric.boundsOfCurveCache = { };\n\n/**\n * If disabled boundsOfCurveCache is not used. For apps that make heavy usage of pencil drawing probably disabling it is better\n * @default true\n */\nfabric.cachesBoundsOfCurve = true;\n\n/**\n * Skip performance testing of setupGLContext and force the use of putImageData that seems to be the one that works best on\n * Chrome + old hardware. if your users are experiencing empty images after filtering you may try to force this to true\n * this has to be set before instantiating the filtering backend ( before filtering the first image )\n * @type Boolean\n * @default false\n */\nfabric.forceGLPutImageData = false;\n\nfabric.initFilterBackend = function() {\n if (fabric.enableGLFiltering && fabric.isWebglSupported && fabric.isWebglSupported(fabric.textureSize)) {\n console.log('max texture size: ' + fabric.maxTextureSize);\n return (new fabric.WebglFilterBackend({ tileSize: fabric.textureSize }));\n }\n else if (fabric.Canvas2dFilterBackend) {\n return (new fabric.Canvas2dFilterBackend());\n }\n};\n\n\nif (typeof document !== 'undefined' && typeof window !== 'undefined') {\n // ensure globality even if entire library were function wrapped (as in Meteor.js packaging system)\n window.fabric = fabric;\n}\n\n\n(function() {\n\n /**\n * @private\n * @param {String} eventName\n * @param {Function} handler\n */\n function _removeEventListener(eventName, handler) {\n if (!this.__eventListeners[eventName]) {\n return;\n }\n var eventListener = this.__eventListeners[eventName];\n if (handler) {\n eventListener[eventListener.indexOf(handler)] = false;\n }\n else {\n fabric.util.array.fill(eventListener, false);\n }\n }\n\n /**\n * Observes specified event\n * @memberOf fabric.Observable\n * @alias on\n * @param {String|Object} eventName Event name (eg. 'after:render') or object with key/value pairs (eg. {'after:render': handler, 'selection:cleared': handler})\n * @param {Function} handler Function that receives a notification when an event of the specified type occurs\n * @return {Self} thisArg\n * @chainable\n */\n function on(eventName, handler) {\n if (!this.__eventListeners) {\n this.__eventListeners = { };\n }\n // one object with key/value pairs was passed\n if (arguments.length === 1) {\n for (var prop in eventName) {\n this.on(prop, eventName[prop]);\n }\n }\n else {\n if (!this.__eventListeners[eventName]) {\n this.__eventListeners[eventName] = [];\n }\n this.__eventListeners[eventName].push(handler);\n }\n return this;\n }\n\n /**\n * Stops event observing for a particular event handler. Calling this method\n * without arguments removes all handlers for all events\n * @memberOf fabric.Observable\n * @alias off\n * @param {String|Object} eventName Event name (eg. 'after:render') or object with key/value pairs (eg. {'after:render': handler, 'selection:cleared': handler})\n * @param {Function} handler Function to be deleted from EventListeners\n * @return {Self} thisArg\n * @chainable\n */\n function off(eventName, handler) {\n if (!this.__eventListeners) {\n return this;\n }\n\n // remove all key/value pairs (event name -> event handler)\n if (arguments.length === 0) {\n for (eventName in this.__eventListeners) {\n _removeEventListener.call(this, eventName);\n }\n }\n // one object with key/value pairs was passed\n else if (arguments.length === 1 && typeof arguments[0] === 'object') {\n for (var prop in eventName) {\n _removeEventListener.call(this, prop, eventName[prop]);\n }\n }\n else {\n _removeEventListener.call(this, eventName, handler);\n }\n return this;\n }\n\n /**\n * Fires event with an optional options object\n * @memberOf fabric.Observable\n * @param {String} eventName Event name to fire\n * @param {Object} [options] Options object\n * @return {Self} thisArg\n * @chainable\n */\n function fire(eventName, options) {\n if (!this.__eventListeners) {\n return this;\n }\n\n var listenersForEvent = this.__eventListeners[eventName];\n if (!listenersForEvent) {\n return this;\n }\n\n for (var i = 0, len = listenersForEvent.length; i < len; i++) {\n listenersForEvent[i] && listenersForEvent[i].call(this, options || { });\n }\n this.__eventListeners[eventName] = listenersForEvent.filter(function(value) {\n return value !== false;\n });\n return this;\n }\n\n /**\n * @namespace fabric.Observable\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-2#events}\n * @see {@link http://fabricjs.com/events|Events demo}\n */\n fabric.Observable = {\n fire: fire,\n on: on,\n off: off,\n };\n})();\n\n\n/**\n * @namespace fabric.Collection\n */\nfabric.Collection = {\n\n _objects: [],\n\n /**\n * Adds objects to collection, Canvas or Group, then renders canvas\n * (if `renderOnAddRemove` is not `false`).\n * in case of Group no changes to bounding box are made.\n * Objects should be instances of (or inherit from) fabric.Object\n * Use of this function is highly discouraged for groups.\n * you can add a bunch of objects with the add method but then you NEED\n * to run a addWithUpdate call for the Group class or position/bbox will be wrong.\n * @param {...fabric.Object} object Zero or more fabric instances\n * @return {Self} thisArg\n * @chainable\n */\n add: function () {\n this._objects.push.apply(this._objects, arguments);\n if (this._onObjectAdded) {\n for (var i = 0, length = arguments.length; i < length; i++) {\n this._onObjectAdded(arguments[i]);\n }\n }\n this.renderOnAddRemove && this.requestRenderAll();\n return this;\n },\n\n /**\n * Inserts an object into collection at specified index, then renders canvas (if `renderOnAddRemove` is not `false`)\n * An object should be an instance of (or inherit from) fabric.Object\n * Use of this function is highly discouraged for groups.\n * you can add a bunch of objects with the insertAt method but then you NEED\n * to run a addWithUpdate call for the Group class or position/bbox will be wrong.\n * @param {Object} object Object to insert\n * @param {Number} index Index to insert object at\n * @param {Boolean} nonSplicing When `true`, no splicing (shifting) of objects occurs\n * @return {Self} thisArg\n * @chainable\n */\n insertAt: function (object, index, nonSplicing) {\n var objects = this._objects;\n if (nonSplicing) {\n objects[index] = object;\n }\n else {\n objects.splice(index, 0, object);\n }\n this._onObjectAdded && this._onObjectAdded(object);\n this.renderOnAddRemove && this.requestRenderAll();\n return this;\n },\n\n /**\n * Removes objects from a collection, then renders canvas (if `renderOnAddRemove` is not `false`)\n * @param {...fabric.Object} object Zero or more fabric instances\n * @return {Self} thisArg\n * @chainable\n */\n remove: function() {\n var objects = this._objects,\n index, somethingRemoved = false;\n\n for (var i = 0, length = arguments.length; i < length; i++) {\n index = objects.indexOf(arguments[i]);\n\n // only call onObjectRemoved if an object was actually removed\n if (index !== -1) {\n somethingRemoved = true;\n objects.splice(index, 1);\n this._onObjectRemoved && this._onObjectRemoved(arguments[i]);\n }\n }\n\n this.renderOnAddRemove && somethingRemoved && this.requestRenderAll();\n return this;\n },\n\n /**\n * Executes given function for each object in this group\n * @param {Function} callback\n * Callback invoked with current object as first argument,\n * index - as second and an array of all objects - as third.\n * Callback is invoked in a context of Global Object (e.g. `window`)\n * when no `context` argument is given\n *\n * @param {Object} context Context (aka thisObject)\n * @return {Self} thisArg\n * @chainable\n */\n forEachObject: function(callback, context) {\n var objects = this.getObjects();\n for (var i = 0, len = objects.length; i < len; i++) {\n callback.call(context, objects[i], i, objects);\n }\n return this;\n },\n\n /**\n * Returns an array of children objects of this instance\n * Type parameter introduced in 1.3.10\n * since 2.3.5 this method return always a COPY of the array;\n * @param {String} [type] When specified, only objects of this type are returned\n * @return {Array}\n */\n getObjects: function(type) {\n if (typeof type === 'undefined') {\n return this._objects.concat();\n }\n return this._objects.filter(function(o) {\n return o.type === type;\n });\n },\n\n /**\n * Returns object at specified index\n * @param {Number} index\n * @return {Self} thisArg\n */\n item: function (index) {\n return this._objects[index];\n },\n\n /**\n * Returns true if collection contains no objects\n * @return {Boolean} true if collection is empty\n */\n isEmpty: function () {\n return this._objects.length === 0;\n },\n\n /**\n * Returns a size of a collection (i.e: length of an array containing its objects)\n * @return {Number} Collection size\n */\n size: function() {\n return this._objects.length;\n },\n\n /**\n * Returns true if collection contains an object\n * @param {Object} object Object to check against\n * @return {Boolean} `true` if collection contains an object\n */\n contains: function(object) {\n return this._objects.indexOf(object) > -1;\n },\n\n /**\n * Returns number representation of a collection complexity\n * @return {Number} complexity\n */\n complexity: function () {\n return this._objects.reduce(function (memo, current) {\n memo += current.complexity ? current.complexity() : 0;\n return memo;\n }, 0);\n }\n};\n\n\n/**\n * @namespace fabric.CommonMethods\n */\nfabric.CommonMethods = {\n\n /**\n * Sets object's properties from options\n * @param {Object} [options] Options object\n */\n _setOptions: function(options) {\n for (var prop in options) {\n this.set(prop, options[prop]);\n }\n },\n\n /**\n * @private\n * @param {Object} [filler] Options object\n * @param {String} [property] property to set the Gradient to\n */\n _initGradient: function(filler, property) {\n if (filler && filler.colorStops && !(filler instanceof fabric.Gradient)) {\n this.set(property, new fabric.Gradient(filler));\n }\n },\n\n /**\n * @private\n * @param {Object} [filler] Options object\n * @param {String} [property] property to set the Pattern to\n * @param {Function} [callback] callback to invoke after pattern load\n */\n _initPattern: function(filler, property, callback) {\n if (filler && filler.source && !(filler instanceof fabric.Pattern)) {\n this.set(property, new fabric.Pattern(filler, callback));\n }\n else {\n callback && callback();\n }\n },\n\n /**\n * @private\n */\n _setObject: function(obj) {\n for (var prop in obj) {\n this._set(prop, obj[prop]);\n }\n },\n\n /**\n * Sets property to a given value. When changing position/dimension -related properties (left, top, scale, angle, etc.) `set` does not update position of object's borders/controls. If you need to update those, call `setCoords()`.\n * @param {String|Object} key Property name or object (if object, iterate over the object properties)\n * @param {Object|Function} value Property value (if function, the value is passed into it and its return value is used as a new one)\n * @return {fabric.Object} thisArg\n * @chainable\n */\n set: function(key, value) {\n if (typeof key === 'object') {\n this._setObject(key);\n }\n else {\n this._set(key, value);\n }\n return this;\n },\n\n _set: function(key, value) {\n this[key] = value;\n },\n\n /**\n * Toggles specified property from `true` to `false` or from `false` to `true`\n * @param {String} property Property to toggle\n * @return {fabric.Object} thisArg\n * @chainable\n */\n toggle: function(property) {\n var value = this.get(property);\n if (typeof value === 'boolean') {\n this.set(property, !value);\n }\n return this;\n },\n\n /**\n * Basic getter\n * @param {String} property Property name\n * @return {*} value of a property\n */\n get: function(property) {\n return this[property];\n }\n};\n\n\n(function(global) {\n\n var sqrt = Math.sqrt,\n atan2 = Math.atan2,\n pow = Math.pow,\n PiBy180 = Math.PI / 180,\n PiBy2 = Math.PI / 2;\n\n /**\n * @namespace fabric.util\n */\n fabric.util = {\n\n /**\n * Calculate the cos of an angle, avoiding returning floats for known results\n * @static\n * @memberOf fabric.util\n * @param {Number} angle the angle in radians or in degree\n * @return {Number}\n */\n cos: function(angle) {\n if (angle === 0) { return 1; }\n if (angle < 0) {\n // cos(a) = cos(-a)\n angle = -angle;\n }\n var angleSlice = angle / PiBy2;\n switch (angleSlice) {\n case 1: case 3: return 0;\n case 2: return -1;\n }\n return Math.cos(angle);\n },\n\n /**\n * Calculate the sin of an angle, avoiding returning floats for known results\n * @static\n * @memberOf fabric.util\n * @param {Number} angle the angle in radians or in degree\n * @return {Number}\n */\n sin: function(angle) {\n if (angle === 0) { return 0; }\n var angleSlice = angle / PiBy2, sign = 1;\n if (angle < 0) {\n // sin(-a) = -sin(a)\n sign = -1;\n }\n switch (angleSlice) {\n case 1: return sign;\n case 2: return 0;\n case 3: return -sign;\n }\n return Math.sin(angle);\n },\n\n /**\n * Removes value from an array.\n * Presence of value (and its position in an array) is determined via `Array.prototype.indexOf`\n * @static\n * @memberOf fabric.util\n * @param {Array} array\n * @param {*} value\n * @return {Array} original array\n */\n removeFromArray: function(array, value) {\n var idx = array.indexOf(value);\n if (idx !== -1) {\n array.splice(idx, 1);\n }\n return array;\n },\n\n /**\n * Returns random number between 2 specified ones.\n * @static\n * @memberOf fabric.util\n * @param {Number} min lower limit\n * @param {Number} max upper limit\n * @return {Number} random value (between min and max)\n */\n getRandomInt: function(min, max) {\n return Math.floor(Math.random() * (max - min + 1)) + min;\n },\n\n /**\n * Transforms degrees to radians.\n * @static\n * @memberOf fabric.util\n * @param {Number} degrees value in degrees\n * @return {Number} value in radians\n */\n degreesToRadians: function(degrees) {\n return degrees * PiBy180;\n },\n\n /**\n * Transforms radians to degrees.\n * @static\n * @memberOf fabric.util\n * @param {Number} radians value in radians\n * @return {Number} value in degrees\n */\n radiansToDegrees: function(radians) {\n return radians / PiBy180;\n },\n\n /**\n * Rotates `point` around `origin` with `radians`\n * @static\n * @memberOf fabric.util\n * @param {fabric.Point} point The point to rotate\n * @param {fabric.Point} origin The origin of the rotation\n * @param {Number} radians The radians of the angle for the rotation\n * @return {fabric.Point} The new rotated point\n */\n rotatePoint: function(point, origin, radians) {\n point.subtractEquals(origin);\n var v = fabric.util.rotateVector(point, radians);\n return new fabric.Point(v.x, v.y).addEquals(origin);\n },\n\n /**\n * Rotates `vector` with `radians`\n * @static\n * @memberOf fabric.util\n * @param {Object} vector The vector to rotate (x and y)\n * @param {Number} radians The radians of the angle for the rotation\n * @return {Object} The new rotated point\n */\n rotateVector: function(vector, radians) {\n var sin = fabric.util.sin(radians),\n cos = fabric.util.cos(radians),\n rx = vector.x * cos - vector.y * sin,\n ry = vector.x * sin + vector.y * cos;\n return {\n x: rx,\n y: ry\n };\n },\n\n /**\n * Apply transform t to point p\n * @static\n * @memberOf fabric.util\n * @param {fabric.Point} p The point to transform\n * @param {Array} t The transform\n * @param {Boolean} [ignoreOffset] Indicates that the offset should not be applied\n * @return {fabric.Point} The transformed point\n */\n transformPoint: function(p, t, ignoreOffset) {\n if (ignoreOffset) {\n return new fabric.Point(\n t[0] * p.x + t[2] * p.y,\n t[1] * p.x + t[3] * p.y\n );\n }\n return new fabric.Point(\n t[0] * p.x + t[2] * p.y + t[4],\n t[1] * p.x + t[3] * p.y + t[5]\n );\n },\n\n /**\n * Returns coordinates of points's bounding rectangle (left, top, width, height)\n * @param {Array} points 4 points array\n * @param {Array} [transform] an array of 6 numbers representing a 2x3 transform matrix\n * @return {Object} Object with left, top, width, height properties\n */\n makeBoundingBoxFromPoints: function(points, transform) {\n if (transform) {\n for (var i = 0; i < points.length; i++) {\n points[i] = fabric.util.transformPoint(points[i], transform);\n }\n }\n var xPoints = [points[0].x, points[1].x, points[2].x, points[3].x],\n minX = fabric.util.array.min(xPoints),\n maxX = fabric.util.array.max(xPoints),\n width = maxX - minX,\n yPoints = [points[0].y, points[1].y, points[2].y, points[3].y],\n minY = fabric.util.array.min(yPoints),\n maxY = fabric.util.array.max(yPoints),\n height = maxY - minY;\n\n return {\n left: minX,\n top: minY,\n width: width,\n height: height\n };\n },\n\n /**\n * Invert transformation t\n * @static\n * @memberOf fabric.util\n * @param {Array} t The transform\n * @return {Array} The inverted transform\n */\n invertTransform: function(t) {\n var a = 1 / (t[0] * t[3] - t[1] * t[2]),\n r = [a * t[3], -a * t[1], -a * t[2], a * t[0]],\n o = fabric.util.transformPoint({ x: t[4], y: t[5] }, r, true);\n r[4] = -o.x;\n r[5] = -o.y;\n return r;\n },\n\n /**\n * A wrapper around Number#toFixed, which contrary to native method returns number, not string.\n * @static\n * @memberOf fabric.util\n * @param {Number|String} number number to operate on\n * @param {Number} fractionDigits number of fraction digits to \"leave\"\n * @return {Number}\n */\n toFixed: function(number, fractionDigits) {\n return parseFloat(Number(number).toFixed(fractionDigits));\n },\n\n /**\n * Converts from attribute value to pixel value if applicable.\n * Returns converted pixels or original value not converted.\n * @param {Number|String} value number to operate on\n * @param {Number} fontSize\n * @return {Number|String}\n */\n parseUnit: function(value, fontSize) {\n var unit = /\\D{0,2}$/.exec(value),\n number = parseFloat(value);\n if (!fontSize) {\n fontSize = fabric.Text.DEFAULT_SVG_FONT_SIZE;\n }\n switch (unit[0]) {\n case 'mm':\n return number * fabric.DPI / 25.4;\n\n case 'cm':\n return number * fabric.DPI / 2.54;\n\n case 'in':\n return number * fabric.DPI;\n\n case 'pt':\n return number * fabric.DPI / 72; // or * 4 / 3\n\n case 'pc':\n return number * fabric.DPI / 72 * 12; // or * 16\n\n case 'em':\n return number * fontSize;\n\n default:\n return number;\n }\n },\n\n /**\n * Function which always returns `false`.\n * @static\n * @memberOf fabric.util\n * @return {Boolean}\n */\n falseFunction: function() {\n return false;\n },\n\n /**\n * Returns klass \"Class\" object of given namespace\n * @memberOf fabric.util\n * @param {String} type Type of object (eg. 'circle')\n * @param {String} namespace Namespace to get klass \"Class\" object from\n * @return {Object} klass \"Class\"\n */\n getKlass: function(type, namespace) {\n // capitalize first letter only\n type = fabric.util.string.camelize(type.charAt(0).toUpperCase() + type.slice(1));\n return fabric.util.resolveNamespace(namespace)[type];\n },\n\n /**\n * Returns array of attributes for given svg that fabric parses\n * @memberOf fabric.util\n * @param {String} type Type of svg element (eg. 'circle')\n * @return {Array} string names of supported attributes\n */\n getSvgAttributes: function(type) {\n var attributes = [\n 'instantiated_by_use',\n 'style',\n 'id',\n 'class'\n ];\n switch (type) {\n case 'linearGradient':\n attributes = attributes.concat(['x1', 'y1', 'x2', 'y2', 'gradientUnits', 'gradientTransform']);\n break;\n case 'radialGradient':\n attributes = attributes.concat(['gradientUnits', 'gradientTransform', 'cx', 'cy', 'r', 'fx', 'fy', 'fr']);\n break;\n case 'stop':\n attributes = attributes.concat(['offset', 'stop-color', 'stop-opacity']);\n break;\n }\n return attributes;\n },\n\n /**\n * Returns object of given namespace\n * @memberOf fabric.util\n * @param {String} namespace Namespace string e.g. 'fabric.Image.filter' or 'fabric'\n * @return {Object} Object for given namespace (default fabric)\n */\n resolveNamespace: function(namespace) {\n if (!namespace) {\n return fabric;\n }\n\n var parts = namespace.split('.'),\n len = parts.length, i,\n obj = global || fabric.window;\n\n for (i = 0; i < len; ++i) {\n obj = obj[parts[i]];\n }\n\n return obj;\n },\n\n /**\n * Loads image element from given url and passes it to a callback\n * @memberOf fabric.util\n * @param {String} url URL representing an image\n * @param {Function} callback Callback; invoked with loaded image\n * @param {*} [context] Context to invoke callback in\n * @param {Object} [crossOrigin] crossOrigin value to set image element to\n */\n loadImage: function(url, callback, context, crossOrigin) {\n if (!url) {\n callback && callback.call(context, url);\n return;\n }\n\n var img = fabric.util.createImage();\n\n /** @ignore */\n var onLoadCallback = function () {\n callback && callback.call(context, img, false);\n img = img.onload = img.onerror = null;\n };\n\n img.onload = onLoadCallback;\n /** @ignore */\n img.onerror = function() {\n fabric.log('Error loading ' + img.src);\n callback && callback.call(context, null, true);\n img = img.onload = img.onerror = null;\n };\n\n // data-urls appear to be buggy with crossOrigin\n // https://github.com/kangax/fabric.js/commit/d0abb90f1cd5c5ef9d2a94d3fb21a22330da3e0a#commitcomment-4513767\n // see https://code.google.com/p/chromium/issues/detail?id=315152\n // https://bugzilla.mozilla.org/show_bug.cgi?id=935069\n // crossOrigin null is the same as not set.\n if (url.indexOf('data') !== 0 &&\n crossOrigin !== undefined &&\n crossOrigin !== null) {\n img.crossOrigin = crossOrigin;\n }\n\n // IE10 / IE11-Fix: SVG contents from data: URI\n // will only be available if the IMG is present\n // in the DOM (and visible)\n if (url.substring(0,14) === 'data:image/svg') {\n img.onload = null;\n fabric.util.loadImageInDom(img, onLoadCallback);\n }\n\n img.src = url;\n },\n\n /**\n * Attaches SVG image with data: URL to the dom\n * @memberOf fabric.util\n * @param {Object} img Image object with data:image/svg src\n * @param {Function} callback Callback; invoked with loaded image\n * @return {Object} DOM element (div containing the SVG image)\n */\n loadImageInDom: function(img, onLoadCallback) {\n var div = fabric.document.createElement('div');\n div.style.width = div.style.height = '1px';\n div.style.left = div.style.top = '-100%';\n div.style.position = 'absolute';\n div.appendChild(img);\n fabric.document.querySelector('body').appendChild(div);\n /**\n * Wrap in function to:\n * 1. Call existing callback\n * 2. Cleanup DOM\n */\n img.onload = function () {\n onLoadCallback();\n div.parentNode.removeChild(div);\n div = null;\n };\n },\n\n /**\n * Creates corresponding fabric instances from their object representations\n * @static\n * @memberOf fabric.util\n * @param {Array} objects Objects to enliven\n * @param {Function} callback Callback to invoke when all objects are created\n * @param {String} namespace Namespace to get klass \"Class\" object from\n * @param {Function} reviver Method for further parsing of object elements,\n * called after each fabric object created.\n */\n enlivenObjects: function(objects, callback, namespace, reviver) {\n objects = objects || [];\n\n var enlivenedObjects = [],\n numLoadedObjects = 0,\n numTotalObjects = objects.length;\n\n function onLoaded() {\n if (++numLoadedObjects === numTotalObjects) {\n callback && callback(enlivenedObjects.filter(function(obj) {\n // filter out undefined objects (objects that gave error)\n return obj;\n }));\n }\n }\n\n if (!numTotalObjects) {\n callback && callback(enlivenedObjects);\n return;\n }\n\n objects.forEach(function (o, index) {\n // if sparse array\n if (!o || !o.type) {\n onLoaded();\n return;\n }\n var klass = fabric.util.getKlass(o.type, namespace);\n klass.fromObject(o, function (obj, error) {\n error || (enlivenedObjects[index] = obj);\n reviver && reviver(o, obj, error);\n onLoaded();\n });\n });\n },\n\n /**\n * Create and wait for loading of patterns\n * @static\n * @memberOf fabric.util\n * @param {Array} patterns Objects to enliven\n * @param {Function} callback Callback to invoke when all objects are created\n * called after each fabric object created.\n */\n enlivenPatterns: function(patterns, callback) {\n patterns = patterns || [];\n\n function onLoaded() {\n if (++numLoadedPatterns === numPatterns) {\n callback && callback(enlivenedPatterns);\n }\n }\n\n var enlivenedPatterns = [],\n numLoadedPatterns = 0,\n numPatterns = patterns.length;\n\n if (!numPatterns) {\n callback && callback(enlivenedPatterns);\n return;\n }\n\n patterns.forEach(function (p, index) {\n if (p && p.source) {\n new fabric.Pattern(p, function(pattern) {\n enlivenedPatterns[index] = pattern;\n onLoaded();\n });\n }\n else {\n enlivenedPatterns[index] = p;\n onLoaded();\n }\n });\n },\n\n /**\n * Groups SVG elements (usually those retrieved from SVG document)\n * @static\n * @memberOf fabric.util\n * @param {Array} elements SVG elements to group\n * @param {Object} [options] Options object\n * @param {String} path Value to set sourcePath to\n * @return {fabric.Object|fabric.Group}\n */\n groupSVGElements: function(elements, options, path) {\n var object;\n if (elements && elements.length === 1) {\n return elements[0];\n }\n if (options) {\n if (options.width && options.height) {\n options.centerPoint = {\n x: options.width / 2,\n y: options.height / 2\n };\n }\n else {\n delete options.width;\n delete options.height;\n }\n }\n object = new fabric.Group(elements, options);\n if (typeof path !== 'undefined') {\n object.sourcePath = path;\n }\n return object;\n },\n\n /**\n * Populates an object with properties of another object\n * @static\n * @memberOf fabric.util\n * @param {Object} source Source object\n * @param {Object} destination Destination object\n * @return {Array} properties Properties names to include\n */\n populateWithProperties: function(source, destination, properties) {\n if (properties && Object.prototype.toString.call(properties) === '[object Array]') {\n for (var i = 0, len = properties.length; i < len; i++) {\n if (properties[i] in source) {\n destination[properties[i]] = source[properties[i]];\n }\n }\n }\n },\n\n /**\n * Draws a dashed line between two points\n *\n * This method is used to draw dashed line around selection area.\n * See <a href=\"http://stackoverflow.com/questions/4576724/dotted-stroke-in-canvas\">dotted stroke in canvas</a>\n *\n * @param {CanvasRenderingContext2D} ctx context\n * @param {Number} x start x coordinate\n * @param {Number} y start y coordinate\n * @param {Number} x2 end x coordinate\n * @param {Number} y2 end y coordinate\n * @param {Array} da dash array pattern\n */\n drawDashedLine: function(ctx, x, y, x2, y2, da) {\n var dx = x2 - x,\n dy = y2 - y,\n len = sqrt(dx * dx + dy * dy),\n rot = atan2(dy, dx),\n dc = da.length,\n di = 0,\n draw = true;\n\n ctx.save();\n ctx.translate(x, y);\n ctx.moveTo(0, 0);\n ctx.rotate(rot);\n\n x = 0;\n while (len > x) {\n x += da[di++ % dc];\n if (x > len) {\n x = len;\n }\n ctx[draw ? 'lineTo' : 'moveTo'](x, 0);\n draw = !draw;\n }\n\n ctx.restore();\n },\n\n /**\n * Creates canvas element\n * @static\n * @memberOf fabric.util\n * @return {CanvasElement} initialized canvas element\n */\n createCanvasElement: function() {\n return fabric.document.createElement('canvas');\n },\n\n /**\n * Creates a canvas element that is a copy of another and is also painted\n * @param {CanvasElement} canvas to copy size and content of\n * @static\n * @memberOf fabric.util\n * @return {CanvasElement} initialized canvas element\n */\n copyCanvasElement: function(canvas) {\n var newCanvas = fabric.util.createCanvasElement();\n newCanvas.width = canvas.width;\n newCanvas.height = canvas.height;\n newCanvas.getContext('2d').drawImage(canvas, 0, 0);\n return newCanvas;\n },\n\n /**\n * since 2.6.0 moved from canvas instance to utility.\n * @param {CanvasElement} canvasEl to copy size and content of\n * @param {String} format 'jpeg' or 'png', in some browsers 'webp' is ok too\n * @param {Number} quality <= 1 and > 0\n * @static\n * @memberOf fabric.util\n * @return {String} data url\n */\n toDataURL: function(canvasEl, format, quality) {\n return canvasEl.toDataURL('image/' + format, quality);\n },\n\n /**\n * Creates image element (works on client and node)\n * @static\n * @memberOf fabric.util\n * @return {HTMLImageElement} HTML image element\n */\n createImage: function() {\n return fabric.document.createElement('img');\n },\n\n /**\n * Multiply matrix A by matrix B to nest transformations\n * @static\n * @memberOf fabric.util\n * @param {Array} a First transformMatrix\n * @param {Array} b Second transformMatrix\n * @param {Boolean} is2x2 flag to multiply matrices as 2x2 matrices\n * @return {Array} The product of the two transform matrices\n */\n multiplyTransformMatrices: function(a, b, is2x2) {\n // Matrix multiply a * b\n return [\n a[0] * b[0] + a[2] * b[1],\n a[1] * b[0] + a[3] * b[1],\n a[0] * b[2] + a[2] * b[3],\n a[1] * b[2] + a[3] * b[3],\n is2x2 ? 0 : a[0] * b[4] + a[2] * b[5] + a[4],\n is2x2 ? 0 : a[1] * b[4] + a[3] * b[5] + a[5]\n ];\n },\n\n /**\n * Decomposes standard 2x3 matrix into transform components\n * @static\n * @memberOf fabric.util\n * @param {Array} a transformMatrix\n * @return {Object} Components of transform\n */\n qrDecompose: function(a) {\n var angle = atan2(a[1], a[0]),\n denom = pow(a[0], 2) + pow(a[1], 2),\n scaleX = sqrt(denom),\n scaleY = (a[0] * a[3] - a[2] * a[1]) / scaleX,\n skewX = atan2(a[0] * a[2] + a[1] * a [3], denom);\n return {\n angle: angle / PiBy180,\n scaleX: scaleX,\n scaleY: scaleY,\n skewX: skewX / PiBy180,\n skewY: 0,\n translateX: a[4],\n translateY: a[5]\n };\n },\n\n /**\n * Returns a transform matrix starting from an object of the same kind of\n * the one returned from qrDecompose, useful also if you want to calculate some\n * transformations from an object that is not enlived yet\n * @static\n * @memberOf fabric.util\n * @param {Object} options\n * @param {Number} [options.angle] angle in degrees\n * @return {Number[]} transform matrix\n */\n calcRotateMatrix: function(options) {\n if (!options.angle) {\n return fabric.iMatrix.concat();\n }\n var theta = fabric.util.degreesToRadians(options.angle),\n cos = fabric.util.cos(theta),\n sin = fabric.util.sin(theta);\n return [cos, sin, -sin, cos, 0, 0];\n },\n\n /**\n * Returns a transform matrix starting from an object of the same kind of\n * the one returned from qrDecompose, useful also if you want to calculate some\n * transformations from an object that is not enlived yet.\n * is called DimensionsTransformMatrix because those properties are the one that influence\n * the size of the resulting box of the object.\n * @static\n * @memberOf fabric.util\n * @param {Object} options\n * @param {Number} [options.scaleX]\n * @param {Number} [options.scaleY]\n * @param {Boolean} [options.flipX]\n * @param {Boolean} [options.flipY]\n * @param {Number} [options.skewX]\n * @param {Number} [options.skewX]\n * @return {Number[]} transform matrix\n */\n calcDimensionsMatrix: function(options) {\n var scaleX = typeof options.scaleX === 'undefined' ? 1 : options.scaleX,\n scaleY = typeof options.scaleY === 'undefined' ? 1 : options.scaleY,\n scaleMatrix = [\n options.flipX ? -scaleX : scaleX,\n 0,\n 0,\n options.flipY ? -scaleY : scaleY,\n 0,\n 0],\n multiply = fabric.util.multiplyTransformMatrices,\n degreesToRadians = fabric.util.degreesToRadians;\n if (options.skewX) {\n scaleMatrix = multiply(\n scaleMatrix,\n [1, 0, Math.tan(degreesToRadians(options.skewX)), 1],\n true);\n }\n if (options.skewY) {\n scaleMatrix = multiply(\n scaleMatrix,\n [1, Math.tan(degreesToRadians(options.skewY)), 0, 1],\n true);\n }\n return scaleMatrix;\n },\n\n /**\n * Returns a transform matrix starting from an object of the same kind of\n * the one returned from qrDecompose, useful also if you want to calculate some\n * transformations from an object that is not enlived yet\n * @static\n * @memberOf fabric.util\n * @param {Object} options\n * @param {Number} [options.angle]\n * @param {Number} [options.scaleX]\n * @param {Number} [options.scaleY]\n * @param {Boolean} [options.flipX]\n * @param {Boolean} [options.flipY]\n * @param {Number} [options.skewX]\n * @param {Number} [options.skewX]\n * @param {Number} [options.translateX]\n * @param {Number} [options.translateY]\n * @return {Number[]} transform matrix\n */\n composeMatrix: function(options) {\n var matrix = [1, 0, 0, 1, options.translateX || 0, options.translateY || 0],\n multiply = fabric.util.multiplyTransformMatrices;\n if (options.angle) {\n matrix = multiply(matrix, fabric.util.calcRotateMatrix(options));\n }\n if (options.scaleX !== 1 || options.scaleY !== 1 ||\n options.skewX || options.skewY || options.flipX || options.flipY) {\n matrix = multiply(matrix, fabric.util.calcDimensionsMatrix(options));\n }\n return matrix;\n },\n\n /**\n * reset an object transform state to neutral. Top and left are not accounted for\n * @static\n * @memberOf fabric.util\n * @param {fabric.Object} target object to transform\n */\n resetObjectTransform: function (target) {\n target.scaleX = 1;\n target.scaleY = 1;\n target.skewX = 0;\n target.skewY = 0;\n target.flipX = false;\n target.flipY = false;\n target.rotate(0);\n },\n\n /**\n * Extract Object transform values\n * @static\n * @memberOf fabric.util\n * @param {fabric.Object} target object to read from\n * @return {Object} Components of transform\n */\n saveObjectTransform: function (target) {\n return {\n scaleX: target.scaleX,\n scaleY: target.scaleY,\n skewX: target.skewX,\n skewY: target.skewY,\n angle: target.angle,\n left: target.left,\n flipX: target.flipX,\n flipY: target.flipY,\n top: target.top\n };\n },\n\n /**\n * Returns true if context has transparent pixel\n * at specified location (taking tolerance into account)\n * @param {CanvasRenderingContext2D} ctx context\n * @param {Number} x x coordinate\n * @param {Number} y y coordinate\n * @param {Number} tolerance Tolerance\n */\n isTransparent: function(ctx, x, y, tolerance) {\n\n // If tolerance is > 0 adjust start coords to take into account.\n // If moves off Canvas fix to 0\n if (tolerance > 0) {\n if (x > tolerance) {\n x -= tolerance;\n }\n else {\n x = 0;\n }\n if (y > tolerance) {\n y -= tolerance;\n }\n else {\n y = 0;\n }\n }\n\n var _isTransparent = true, i, temp,\n imageData = ctx.getImageData(x, y, (tolerance * 2) || 1, (tolerance * 2) || 1),\n l = imageData.data.length;\n\n // Split image data - for tolerance > 1, pixelDataSize = 4;\n for (i = 3; i < l; i += 4) {\n temp = imageData.data[i];\n _isTransparent = temp <= 0;\n if (_isTransparent === false) {\n break; // Stop if colour found\n }\n }\n\n imageData = null;\n\n return _isTransparent;\n },\n\n /**\n * Parse preserveAspectRatio attribute from element\n * @param {string} attribute to be parsed\n * @return {Object} an object containing align and meetOrSlice attribute\n */\n parsePreserveAspectRatioAttribute: function(attribute) {\n var meetOrSlice = 'meet', alignX = 'Mid', alignY = 'Mid',\n aspectRatioAttrs = attribute.split(' '), align;\n\n if (aspectRatioAttrs && aspectRatioAttrs.length) {\n meetOrSlice = aspectRatioAttrs.pop();\n if (meetOrSlice !== 'meet' && meetOrSlice !== 'slice') {\n align = meetOrSlice;\n meetOrSlice = 'meet';\n }\n else if (aspectRatioAttrs.length) {\n align = aspectRatioAttrs.pop();\n }\n }\n //divide align in alignX and alignY\n alignX = align !== 'none' ? align.slice(1, 4) : 'none';\n alignY = align !== 'none' ? align.slice(5, 8) : 'none';\n return {\n meetOrSlice: meetOrSlice,\n alignX: alignX,\n alignY: alignY\n };\n },\n\n /**\n * Clear char widths cache for the given font family or all the cache if no\n * fontFamily is specified.\n * Use it if you know you are loading fonts in a lazy way and you are not waiting\n * for custom fonts to load properly when adding text objects to the canvas.\n * If a text object is added when its own font is not loaded yet, you will get wrong\n * measurement and so wrong bounding boxes.\n * After the font cache is cleared, either change the textObject text content or call\n * initDimensions() to trigger a recalculation\n * @memberOf fabric.util\n * @param {String} [fontFamily] font family to clear\n */\n clearFabricFontCache: function(fontFamily) {\n fontFamily = (fontFamily || '').toLowerCase();\n if (!fontFamily) {\n fabric.charWidthsCache = { };\n }\n else if (fabric.charWidthsCache[fontFamily]) {\n delete fabric.charWidthsCache[fontFamily];\n }\n },\n\n /**\n * Given current aspect ratio, determines the max width and height that can\n * respect the total allowed area for the cache.\n * @memberOf fabric.util\n * @param {Number} ar aspect ratio\n * @param {Number} maximumArea Maximum area you want to achieve\n * @return {Object.x} Limited dimensions by X\n * @return {Object.y} Limited dimensions by Y\n */\n limitDimsByArea: function(ar, maximumArea) {\n var roughWidth = Math.sqrt(maximumArea * ar),\n perfLimitSizeY = Math.floor(maximumArea / roughWidth);\n return { x: Math.floor(roughWidth), y: perfLimitSizeY };\n },\n\n capValue: function(min, value, max) {\n return Math.max(min, Math.min(value, max));\n },\n\n /**\n * Finds the scale for the object source to fit inside the object destination,\n * keeping aspect ratio intact.\n * respect the total allowed area for the cache.\n * @memberOf fabric.util\n * @param {Object | fabric.Object} source\n * @param {Number} source.height natural unscaled height of the object\n * @param {Number} source.width natural unscaled width of the object\n * @param {Object | fabric.Object} destination\n * @param {Number} destination.height natural unscaled height of the object\n * @param {Number} destination.width natural unscaled width of the object\n * @return {Number} scale factor to apply to source to fit into destination\n */\n findScaleToFit: function(source, destination) {\n return Math.min(destination.width / source.width, destination.height / source.height);\n },\n\n /**\n * Finds the scale for the object source to cover entirely the object destination,\n * keeping aspect ratio intact.\n * respect the total allowed area for the cache.\n * @memberOf fabric.util\n * @param {Object | fabric.Object} source\n * @param {Number} source.height natural unscaled height of the object\n * @param {Number} source.width natural unscaled width of the object\n * @param {Object | fabric.Object} destination\n * @param {Number} destination.height natural unscaled height of the object\n * @param {Number} destination.width natural unscaled width of the object\n * @return {Number} scale factor to apply to source to cover destination\n */\n findScaleToCover: function(source, destination) {\n return Math.max(destination.width / source.width, destination.height / source.height);\n },\n\n /**\n * given an array of 6 number returns something like `\"matrix(...numbers)\"`\n * @memberOf fabric.util\n * @param {Array} trasnform an array with 6 numbers\n * @return {String} transform matrix for svg\n * @return {Object.y} Limited dimensions by Y\n */\n matrixToSVG: function(transform) {\n return 'matrix(' + transform.map(function(value) {\n return fabric.util.toFixed(value, fabric.Object.NUM_FRACTION_DIGITS);\n }).join(' ') + ')';\n },\n\n /**\n * given a width and height, return the size of the bounding box\n * that can contains the box with width/height with applied transform\n * described in options.\n * Use to calculate the boxes around objects for controls.\n * @memberOf fabric.util\n * @param {Number} width\n * @param {Number} height\n * @param {Object} options\n * @param {Number} options.scaleX\n * @param {Number} options.scaleY\n * @param {Number} options.skewX\n * @param {Number} options.skewY\n * @return {Object.x} width of containing\n * @return {Object.y} height of containing\n */\n sizeAfterTransform: function(width, height, options) {\n var dimX = width / 2, dimY = height / 2,\n points = [\n {\n x: -dimX,\n y: -dimY\n },\n {\n x: dimX,\n y: -dimY\n },\n {\n x: -dimX,\n y: dimY\n },\n {\n x: dimX,\n y: dimY\n }],\n transformMatrix = fabric.util.calcDimensionsMatrix(options),\n bbox = fabric.util.makeBoundingBoxFromPoints(points, transformMatrix);\n return {\n x: bbox.width,\n y: bbox.height,\n };\n }\n };\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function() {\n var _join = Array.prototype.join,\n commandLengths = {\n m: 2,\n l: 2,\n h: 1,\n v: 1,\n c: 6,\n s: 4,\n q: 4,\n t: 2,\n a: 7\n },\n repeatedCommands = {\n m: 'l',\n M: 'L'\n };\n function segmentToBezier(th2, th3, cosTh, sinTh, rx, ry, cx1, cy1, mT, fromX, fromY) {\n var costh2 = fabric.util.cos(th2),\n sinth2 = fabric.util.sin(th2),\n costh3 = fabric.util.cos(th3),\n sinth3 = fabric.util.sin(th3),\n toX = cosTh * rx * costh3 - sinTh * ry * sinth3 + cx1,\n toY = sinTh * rx * costh3 + cosTh * ry * sinth3 + cy1,\n cp1X = fromX + mT * ( -cosTh * rx * sinth2 - sinTh * ry * costh2),\n cp1Y = fromY + mT * ( -sinTh * rx * sinth2 + cosTh * ry * costh2),\n cp2X = toX + mT * ( cosTh * rx * sinth3 + sinTh * ry * costh3),\n cp2Y = toY + mT * ( sinTh * rx * sinth3 - cosTh * ry * costh3);\n\n return ['C',\n cp1X, cp1Y,\n cp2X, cp2Y,\n toX, toY\n ];\n }\n\n /* Adapted from http://dxr.mozilla.org/mozilla-central/source/content/svg/content/src/nsSVGPathDataParser.cpp\n * by Andrea Bogazzi code is under MPL. if you don't have a copy of the license you can take it here\n * http://mozilla.org/MPL/2.0/\n */\n function arcToSegments(toX, toY, rx, ry, large, sweep, rotateX) {\n var PI = Math.PI, th = rotateX * PI / 180,\n sinTh = fabric.util.sin(th),\n cosTh = fabric.util.cos(th),\n fromX = 0, fromY = 0;\n\n rx = Math.abs(rx);\n ry = Math.abs(ry);\n\n var px = -cosTh * toX * 0.5 - sinTh * toY * 0.5,\n py = -cosTh * toY * 0.5 + sinTh * toX * 0.5,\n rx2 = rx * rx, ry2 = ry * ry, py2 = py * py, px2 = px * px,\n pl = rx2 * ry2 - rx2 * py2 - ry2 * px2,\n root = 0;\n\n if (pl < 0) {\n var s = Math.sqrt(1 - pl / (rx2 * ry2));\n rx *= s;\n ry *= s;\n }\n else {\n root = (large === sweep ? -1.0 : 1.0) *\n Math.sqrt( pl / (rx2 * py2 + ry2 * px2));\n }\n\n var cx = root * rx * py / ry,\n cy = -root * ry * px / rx,\n cx1 = cosTh * cx - sinTh * cy + toX * 0.5,\n cy1 = sinTh * cx + cosTh * cy + toY * 0.5,\n mTheta = calcVectorAngle(1, 0, (px - cx) / rx, (py - cy) / ry),\n dtheta = calcVectorAngle((px - cx) / rx, (py - cy) / ry, (-px - cx) / rx, (-py - cy) / ry);\n\n if (sweep === 0 && dtheta > 0) {\n dtheta -= 2 * PI;\n }\n else if (sweep === 1 && dtheta < 0) {\n dtheta += 2 * PI;\n }\n\n // Convert into cubic bezier segments <= 90deg\n var segments = Math.ceil(Math.abs(dtheta / PI * 2)),\n result = [], mDelta = dtheta / segments,\n mT = 8 / 3 * Math.sin(mDelta / 4) * Math.sin(mDelta / 4) / Math.sin(mDelta / 2),\n th3 = mTheta + mDelta;\n\n for (var i = 0; i < segments; i++) {\n result[i] = segmentToBezier(mTheta, th3, cosTh, sinTh, rx, ry, cx1, cy1, mT, fromX, fromY);\n fromX = result[i][5];\n fromY = result[i][6];\n mTheta = th3;\n th3 += mDelta;\n }\n return result;\n }\n\n /*\n * Private\n */\n function calcVectorAngle(ux, uy, vx, vy) {\n var ta = Math.atan2(uy, ux),\n tb = Math.atan2(vy, vx);\n if (tb >= ta) {\n return tb - ta;\n }\n else {\n return 2 * Math.PI - (ta - tb);\n }\n }\n\n /**\n * Calculate bounding box of a beziercurve\n * @param {Number} x0 starting point\n * @param {Number} y0\n * @param {Number} x1 first control point\n * @param {Number} y1\n * @param {Number} x2 secondo control point\n * @param {Number} y2\n * @param {Number} x3 end of beizer\n * @param {Number} y3\n */\n // taken from http://jsbin.com/ivomiq/56/edit no credits available for that.\n // TODO: can we normalize this with the starting points set at 0 and then translated the bbox?\n function getBoundsOfCurve(x0, y0, x1, y1, x2, y2, x3, y3) {\n var argsString;\n if (fabric.cachesBoundsOfCurve) {\n argsString = _join.call(arguments);\n if (fabric.boundsOfCurveCache[argsString]) {\n return fabric.boundsOfCurveCache[argsString];\n }\n }\n\n var sqrt = Math.sqrt,\n min = Math.min, max = Math.max,\n abs = Math.abs, tvalues = [],\n bounds = [[], []],\n a, b, c, t, t1, t2, b2ac, sqrtb2ac;\n\n b = 6 * x0 - 12 * x1 + 6 * x2;\n a = -3 * x0 + 9 * x1 - 9 * x2 + 3 * x3;\n c = 3 * x1 - 3 * x0;\n\n for (var i = 0; i < 2; ++i) {\n if (i > 0) {\n b = 6 * y0 - 12 * y1 + 6 * y2;\n a = -3 * y0 + 9 * y1 - 9 * y2 + 3 * y3;\n c = 3 * y1 - 3 * y0;\n }\n\n if (abs(a) < 1e-12) {\n if (abs(b) < 1e-12) {\n continue;\n }\n t = -c / b;\n if (0 < t && t < 1) {\n tvalues.push(t);\n }\n continue;\n }\n b2ac = b * b - 4 * c * a;\n if (b2ac < 0) {\n continue;\n }\n sqrtb2ac = sqrt(b2ac);\n t1 = (-b + sqrtb2ac) / (2 * a);\n if (0 < t1 && t1 < 1) {\n tvalues.push(t1);\n }\n t2 = (-b - sqrtb2ac) / (2 * a);\n if (0 < t2 && t2 < 1) {\n tvalues.push(t2);\n }\n }\n\n var x, y, j = tvalues.length, jlen = j, mt;\n while (j--) {\n t = tvalues[j];\n mt = 1 - t;\n x = (mt * mt * mt * x0) + (3 * mt * mt * t * x1) + (3 * mt * t * t * x2) + (t * t * t * x3);\n bounds[0][j] = x;\n\n y = (mt * mt * mt * y0) + (3 * mt * mt * t * y1) + (3 * mt * t * t * y2) + (t * t * t * y3);\n bounds[1][j] = y;\n }\n\n bounds[0][jlen] = x0;\n bounds[1][jlen] = y0;\n bounds[0][jlen + 1] = x3;\n bounds[1][jlen + 1] = y3;\n var result = [\n {\n x: min.apply(null, bounds[0]),\n y: min.apply(null, bounds[1])\n },\n {\n x: max.apply(null, bounds[0]),\n y: max.apply(null, bounds[1])\n }\n ];\n if (fabric.cachesBoundsOfCurve) {\n fabric.boundsOfCurveCache[argsString] = result;\n }\n return result;\n }\n\n /**\n * Converts arc to a bunch of beizer curves\n * @param {Number} fx starting point x\n * @param {Number} fy starting point y\n * @param {Array} coords Arc command\n */\n function fromArcToBeizers(fx, fy, coords) {\n var rx = coords[1],\n ry = coords[2],\n rot = coords[3],\n large = coords[4],\n sweep = coords[5],\n tx = coords[6],\n ty = coords[7],\n segsNorm = arcToSegments(tx - fx, ty - fy, rx, ry, large, sweep, rot);\n\n for (var i = 0, len = segsNorm.length; i < len; i++) {\n segsNorm[i][1] += fx;\n segsNorm[i][2] += fy;\n segsNorm[i][3] += fx;\n segsNorm[i][4] += fy;\n segsNorm[i][5] += fx;\n segsNorm[i][6] += fy;\n }\n return segsNorm;\n };\n\n\n function makePathSimpler(path) {\n // x and y represent the last point of the path. the previous command point.\n // we add them to each relative command to make it an absolute comment.\n // we also swap the v V h H with L, because are easier to transform.\n var x = 0, y = 0, len = path.length,\n // x1 and y1 represent the last point of the subpath. the subpath is started with\n // m or M command. When a z or Z command is drawn, x and y need to be resetted to\n // the last x1 and y1.\n x1 = 0, y1 = 0, current, i, converted,\n // previous will host the letter of the previous command, to handle S and T.\n // controlX and controlY will host the previous reflected control point\n destinationPath = [], previous, controlX, controlY;\n for (i = 0; i < len; ++i) {\n converted = false;\n current = path[i].slice(0);\n switch (current[0]) { // first letter\n case 'l': // lineto, relative\n current[0] = 'L';\n current[1] += x;\n current[2] += y;\n // falls through\n case 'L':\n x = current[1];\n y = current[2];\n break;\n case 'h': // horizontal lineto, relative\n current[1] += x;\n // falls through\n case 'H':\n current[0] = 'L';\n current[2] = y;\n x = current[1];\n break;\n case 'v': // vertical lineto, relative\n current[1] += y;\n // falls through\n case 'V':\n current[0] = 'L';\n y = current[1];\n current[1] = x;\n current[2] = y;\n break;\n case 'm': // moveTo, relative\n current[0] = 'M';\n current[1] += x;\n current[2] += y;\n // falls through\n case 'M':\n x = current[1];\n y = current[2];\n x1 = current[1];\n y1 = current[2];\n break;\n case 'c': // bezierCurveTo, relative\n current[0] = 'C';\n current[1] += x;\n current[2] += y;\n current[3] += x;\n current[4] += y;\n current[5] += x;\n current[6] += y;\n // falls through\n case 'C':\n controlX = current[3];\n controlY = current[4];\n x = current[5];\n y = current[6];\n break;\n case 's': // shorthand cubic bezierCurveTo, relative\n current[0] = 'S';\n current[1] += x;\n current[2] += y;\n current[3] += x;\n current[4] += y;\n // falls through\n case 'S':\n // would be sScC but since we are swapping sSc for C, we check just that.\n if (previous === 'C') {\n // calculate reflection of previous control points\n controlX = 2 * x - controlX;\n controlY = 2 * y - controlY;\n }\n else {\n // If there is no previous command or if the previous command was not a C, c, S, or s,\n // the control point is coincident with the current point\n controlX = x;\n controlY = y;\n }\n x = current[3];\n y = current[4];\n current[0] = 'C';\n current[5] = current[3];\n current[6] = current[4];\n current[3] = current[1];\n current[4] = current[2];\n current[1] = controlX;\n current[2] = controlY;\n // current[3] and current[4] are NOW the second control point.\n // we keep it for the next reflection.\n controlX = current[3];\n controlY = current[4];\n break;\n case 'q': // quadraticCurveTo, relative\n current[0] = 'Q';\n current[1] += x;\n current[2] += y;\n current[3] += x;\n current[4] += y;\n // falls through\n case 'Q':\n controlX = current[1];\n controlY = current[2];\n x = current[3];\n y = current[4];\n break;\n case 't': // shorthand quadraticCurveTo, relative\n current[0] = 'T';\n current[1] += x;\n current[2] += y;\n // falls through\n case 'T':\n if (previous === 'Q') {\n // calculate reflection of previous control point\n controlX = 2 * x - controlX;\n controlY = 2 * y - controlY;\n }\n else {\n // If there is no previous command or if the previous command was not a Q, q, T or t,\n // assume the control point is coincident with the current point\n controlX = x;\n controlY = y;\n }\n current[0] = 'Q';\n x = current[1];\n y = current[2];\n current[1] = controlX;\n current[2] = controlY;\n current[3] = x;\n current[4] = y;\n break;\n case 'a':\n current[0] = 'A';\n current[6] += x;\n current[7] += y;\n // falls through\n case 'A':\n converted = true;\n destinationPath = destinationPath.concat(fromArcToBeizers(x, y, current));\n x = current[6];\n y = current[7];\n break;\n case 'z':\n case 'Z':\n x = x1;\n y = y1;\n break;\n default:\n }\n if (!converted) {\n destinationPath.push(current);\n }\n previous = current[0];\n }\n return destinationPath;\n };\n\n /**\n * Calc length from point x1,y1 to x2,y2\n * @param {Number} x1 starting point x\n * @param {Number} y1 starting point y\n * @param {Number} x2 starting point x\n * @param {Number} y2 starting point y\n * @return {Number} length of segment\n */\n function calcLineLength(x1, y1, x2, y2) {\n return Math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));\n }\n\n // functions for the Cubic beizer\n // taken from: https://github.com/konvajs/konva/blob/7.0.5/src/shapes/Path.ts#L350\n function CB1(t) {\n return t * t * t;\n }\n function CB2(t) {\n return 3 * t * t * (1 - t);\n }\n function CB3(t) {\n return 3 * t * (1 - t) * (1 - t);\n }\n function CB4(t) {\n return (1 - t) * (1 - t) * (1 - t);\n }\n\n function getPointOnCubicBezierIterator(p1x, p1y, p2x, p2y, p3x, p3y, p4x, p4y) {\n return function(pct) {\n var c1 = CB1(pct), c2 = CB2(pct), c3 = CB3(pct), c4 = CB4(pct);\n return {\n x: p4x * c1 + p3x * c2 + p2x * c3 + p1x * c4,\n y: p4y * c1 + p3y * c2 + p2y * c3 + p1y * c4\n };\n };\n }\n\n function QB1(t) {\n return t * t;\n }\n\n function QB2(t) {\n return 2 * t * (1 - t);\n }\n\n function QB3(t) {\n return (1 - t) * (1 - t);\n }\n\n function getPointOnQuadraticBezierIterator(p1x, p1y, p2x, p2y, p3x, p3y) {\n return function(pct) {\n var c1 = QB1(pct), c2 = QB2(pct), c3 = QB3(pct);\n return {\n x: p3x * c1 + p2x * c2 + p1x * c3,\n y: p3y * c1 + p2y * c2 + p1y * c3\n };\n };\n }\n\n function pathIterator(iterator, x1, y1) {\n var tempP = { x: x1, y: y1 }, p, tmpLen = 0, perc;\n for (perc = 0.01; perc <= 1; perc += 0.01) {\n p = iterator(perc);\n tmpLen += calcLineLength(tempP.x, tempP.y, p.x, p.y);\n tempP = p;\n }\n return tmpLen;\n }\n\n //measures the length of a pre-simplified path\n function getPathSegmentsInfo(path) {\n var totalLength = 0, len = path.length, current,\n //x2 and y2 are the coords of segment start\n //x1 and y1 are the coords of the current point\n x1 = 0, y1 = 0, x2 = 0, y2 = 0, info = [], iterator, tempInfo;\n for (var i = 0; i < len; i++) {\n current = path[i];\n tempInfo = {\n x: x1,\n y: y1,\n command: current[0],\n };\n switch (current[0]) { //first letter\n case 'M':\n tempInfo.length = 0;\n x2 = x1 = current[1];\n y2 = y1 = current[2];\n break;\n case 'L':\n tempInfo.length = calcLineLength(x1, y1, current[1], current[2]);\n x1 = current[1];\n y1 = current[2];\n break;\n case 'C':\n iterator = getPointOnCubicBezierIterator(\n x1,\n y1,\n current[1],\n current[2],\n current[3],\n current[4],\n current[5],\n current[6]\n );\n tempInfo.length = pathIterator(iterator, x1, y1);\n x1 = current[5];\n y1 = current[6];\n break;\n case 'Q':\n iterator = getPointOnQuadraticBezierIterator(\n x1,\n y1,\n current[1],\n current[2],\n current[3],\n current[4]\n );\n tempInfo.length = pathIterator(iterator, x1, y1);\n x1 = current[3];\n y1 = current[4];\n break;\n case 'Z':\n case 'z':\n // we add those in order to ease calculations later\n tempInfo.destX = x2;\n tempInfo.destY = y2;\n tempInfo.length = calcLineLength(x1, y1, x2, y2);\n x1 = x2;\n y1 = y2;\n break;\n }\n totalLength += tempInfo.length;\n info.push(tempInfo);\n }\n info.push({ length: totalLength, x: x1, y: y1 });\n return info;\n }\n\n function getPointOnPath(path, perc, infos) {\n if (!infos) {\n infos = getPathSegmentsInfo(path);\n }\n var distance = infos[infos.length - 1] * perc, i = 0;\n while ((distance - infos[i] > 0) && i < infos.length) {\n distance -= infos[i];\n i++;\n }\n var segInfo = infos[i], segPercent = distance / segInfo.length,\n command = segInfo.length, segment = path[i];\n switch (command) {\n case 'Z':\n case 'z':\n return new fabric.Point(segInfo.x, segInfo.y).lerp(\n new fabric.Point(segInfo.destX, segInfo.destY),\n segPercent\n );\n break;\n case 'L':\n return new fabric.Point(segInfo.x, segInfo.y).lerp(\n new fabric.Point(segment[1], segment[2]),\n segPercent\n );\n break;\n case 'C':\n return getPointOnCubicBezierIterator(\n segInfo.x,\n segInfo.y,\n segment[1],\n segment[2],\n segment[3],\n segment[4],\n segment[5],\n segment[6]\n )(segPercent);\n break;\n case 'Q':\n return getPointOnQuadraticBezierIterator(\n segInfo.x,\n segInfo.y,\n segment[1],\n segment[2],\n segment[3],\n segment[4]\n )(segPercent);\n break;\n }\n }\n\n function parsePath(pathString) {\n var result = [],\n coords = [],\n currentPath,\n parsed,\n re = fabric.rePathCommand,\n rNumber = '[-+]?(?:\\\\d*\\\\.\\\\d+|\\\\d+\\\\.?)(?:[eE][-+]?\\\\d+)?\\\\s*',\n rNumberCommaWsp = '(' + rNumber + ')' + fabric.commaWsp,\n rFlagCommaWsp = '([01])' + fabric.commaWsp + '?',\n rArcSeq = rNumberCommaWsp + '?' + rNumberCommaWsp + '?' + rNumberCommaWsp + rFlagCommaWsp + rFlagCommaWsp +\n rNumberCommaWsp + '?(' + rNumber + ')',\n regArcArgumentSequence = new RegExp(rArcSeq, 'g'),\n match,\n coordsStr,\n // one of commands (m,M,l,L,q,Q,c,C,etc.) followed by non-command characters (i.e. command values)\n path;\n if (!pathString || !pathString.match) {\n return result;\n }\n path = pathString.match(/[mzlhvcsqta][^mzlhvcsqta]*/gi);\n\n for (var i = 0, coordsParsed, len = path.length; i < len; i++) {\n currentPath = path[i];\n\n coordsStr = currentPath.slice(1).trim();\n coords.length = 0;\n\n var command = currentPath.charAt(0);\n coordsParsed = [command];\n\n if (command.toLowerCase() === 'a') {\n // arcs have special flags that apparently don't require spaces so handle special\n for (var args; (args = regArcArgumentSequence.exec(coordsStr));) {\n for (var j = 1; j < args.length; j++) {\n coords.push(args[j]);\n }\n }\n }\n else {\n while ((match = re.exec(coordsStr))) {\n coords.push(match[0]);\n }\n }\n\n for (var j = 0, jlen = coords.length; j < jlen; j++) {\n parsed = parseFloat(coords[j]);\n if (!isNaN(parsed)) {\n coordsParsed.push(parsed);\n }\n }\n\n var commandLength = commandLengths[command.toLowerCase()],\n repeatedCommand = repeatedCommands[command] || command;\n\n if (coordsParsed.length - 1 > commandLength) {\n for (var k = 1, klen = coordsParsed.length; k < klen; k += commandLength) {\n result.push([command].concat(coordsParsed.slice(k, k + commandLength)));\n command = repeatedCommand;\n }\n }\n else {\n result.push(coordsParsed);\n }\n }\n\n return result;\n };\n\n /**\n * Calculate bounding box of a elliptic-arc\n * @deprecated\n * @param {Number} fx start point of arc\n * @param {Number} fy\n * @param {Number} rx horizontal radius\n * @param {Number} ry vertical radius\n * @param {Number} rot angle of horizontal axis\n * @param {Number} large 1 or 0, whatever the arc is the big or the small on the 2 points\n * @param {Number} sweep 1 or 0, 1 clockwise or counterclockwise direction\n * @param {Number} tx end point of arc\n * @param {Number} ty\n */\n function getBoundsOfArc(fx, fy, rx, ry, rot, large, sweep, tx, ty) {\n\n var fromX = 0, fromY = 0, bound, bounds = [],\n segs = arcToSegments(tx - fx, ty - fy, rx, ry, large, sweep, rot);\n\n for (var i = 0, len = segs.length; i < len; i++) {\n bound = getBoundsOfCurve(fromX, fromY, segs[i][1], segs[i][2], segs[i][3], segs[i][4], segs[i][5], segs[i][6]);\n bounds.push({ x: bound[0].x + fx, y: bound[0].y + fy });\n bounds.push({ x: bound[1].x + fx, y: bound[1].y + fy });\n fromX = segs[i][5];\n fromY = segs[i][6];\n }\n return bounds;\n };\n\n /**\n * Draws arc\n * @param {CanvasRenderingContext2D} ctx\n * @param {Number} fx\n * @param {Number} fy\n * @param {Array} coords coords of the arc, without the front 'A/a'\n */\n function drawArc(ctx, fx, fy, coords) {\n coords = coords.slice(0).unshift('X'); // command A or a does not matter\n var beizers = fromArcToBeizers(fx, fy, coords);\n beizers.forEach(function(beizer) {\n ctx.bezierCurveTo.apply(ctx, beizer.slice(1));\n });\n };\n\n fabric.util.parsePath = parsePath;\n fabric.util.makePathSimpler = makePathSimpler;\n fabric.util.getPathSegmentsInfo = getPathSegmentsInfo;\n fabric.util.fromArcToBeizers = fromArcToBeizers;\n fabric.util.getBoundsOfCurve = getBoundsOfCurve;\n fabric.util.getPointOnPath = getPointOnPath;\n // kept because we do not want to make breaking changes.\n // but useless and deprecated.\n fabric.util.getBoundsOfArc = getBoundsOfArc;\n fabric.util.drawArc = drawArc;\n})();\n\n\n(function() {\n\n var slice = Array.prototype.slice;\n\n /**\n * Invokes method on all items in a given array\n * @memberOf fabric.util.array\n * @param {Array} array Array to iterate over\n * @param {String} method Name of a method to invoke\n * @return {Array}\n */\n function invoke(array, method) {\n var args = slice.call(arguments, 2), result = [];\n for (var i = 0, len = array.length; i < len; i++) {\n result[i] = args.length ? array[i][method].apply(array[i], args) : array[i][method].call(array[i]);\n }\n return result;\n }\n\n /**\n * Finds maximum value in array (not necessarily \"first\" one)\n * @memberOf fabric.util.array\n * @param {Array} array Array to iterate over\n * @param {String} byProperty\n * @return {*}\n */\n function max(array, byProperty) {\n return find(array, byProperty, function(value1, value2) {\n return value1 >= value2;\n });\n }\n\n /**\n * Finds minimum value in array (not necessarily \"first\" one)\n * @memberOf fabric.util.array\n * @param {Array} array Array to iterate over\n * @param {String} byProperty\n * @return {*}\n */\n function min(array, byProperty) {\n return find(array, byProperty, function(value1, value2) {\n return value1 < value2;\n });\n }\n\n /**\n * @private\n */\n function fill(array, value) {\n var k = array.length;\n while (k--) {\n array[k] = value;\n }\n return array;\n }\n\n /**\n * @private\n */\n function find(array, byProperty, condition) {\n if (!array || array.length === 0) {\n return;\n }\n\n var i = array.length - 1,\n result = byProperty ? array[i][byProperty] : array[i];\n if (byProperty) {\n while (i--) {\n if (condition(array[i][byProperty], result)) {\n result = array[i][byProperty];\n }\n }\n }\n else {\n while (i--) {\n if (condition(array[i], result)) {\n result = array[i];\n }\n }\n }\n return result;\n }\n\n /**\n * @namespace fabric.util.array\n */\n fabric.util.array = {\n fill: fill,\n invoke: invoke,\n min: min,\n max: max\n };\n\n})();\n\n\n(function() {\n /**\n * Copies all enumerable properties of one js object to another\n * this does not and cannot compete with generic utils.\n * Does not clone or extend fabric.Object subclasses.\n * This is mostly for internal use and has extra handling for fabricJS objects\n * it skips the canvas and group properties in deep cloning.\n * @memberOf fabric.util.object\n * @param {Object} destination Where to copy to\n * @param {Object} source Where to copy from\n * @return {Object}\n */\n\n function extend(destination, source, deep) {\n // JScript DontEnum bug is not taken care of\n // the deep clone is for internal use, is not meant to avoid\n // javascript traps or cloning html element or self referenced objects.\n if (deep) {\n if (!fabric.isLikelyNode && source instanceof Element) {\n // avoid cloning deep images, canvases,\n destination = source;\n }\n else if (source instanceof Array) {\n destination = [];\n for (var i = 0, len = source.length; i < len; i++) {\n destination[i] = extend({ }, source[i], deep);\n }\n }\n else if (source && typeof source === 'object') {\n for (var property in source) {\n if (property === 'canvas' || property === 'group') {\n // we do not want to clone this props at all.\n // we want to keep the keys in the copy\n destination[property] = null;\n }\n else if (source.hasOwnProperty(property)) {\n destination[property] = extend({ }, source[property], deep);\n }\n }\n }\n else {\n // this sounds odd for an extend but is ok for recursive use\n destination = source;\n }\n }\n else {\n for (var property in source) {\n destination[property] = source[property];\n }\n }\n return destination;\n }\n\n /**\n * Creates an empty object and copies all enumerable properties of another object to it\n * @memberOf fabric.util.object\n * TODO: this function return an empty object if you try to clone null\n * @param {Object} object Object to clone\n * @return {Object}\n */\n function clone(object, deep) {\n return extend({ }, object, deep);\n }\n\n /** @namespace fabric.util.object */\n fabric.util.object = {\n extend: extend,\n clone: clone\n };\n fabric.util.object.extend(fabric.util, fabric.Observable);\n})();\n\n\n(function() {\n\n /**\n * Camelizes a string\n * @memberOf fabric.util.string\n * @param {String} string String to camelize\n * @return {String} Camelized version of a string\n */\n function camelize(string) {\n return string.replace(/-+(.)?/g, function(match, character) {\n return character ? character.toUpperCase() : '';\n });\n }\n\n /**\n * Capitalizes a string\n * @memberOf fabric.util.string\n * @param {String} string String to capitalize\n * @param {Boolean} [firstLetterOnly] If true only first letter is capitalized\n * and other letters stay untouched, if false first letter is capitalized\n * and other letters are converted to lowercase.\n * @return {String} Capitalized version of a string\n */\n function capitalize(string, firstLetterOnly) {\n return string.charAt(0).toUpperCase() +\n (firstLetterOnly ? string.slice(1) : string.slice(1).toLowerCase());\n }\n\n /**\n * Escapes XML in a string\n * @memberOf fabric.util.string\n * @param {String} string String to escape\n * @return {String} Escaped version of a string\n */\n function escapeXml(string) {\n return string.replace(/&/g, '&')\n .replace(/\"/g, '"')\n .replace(/'/g, ''')\n .replace(/</g, '<')\n .replace(/>/g, '>');\n }\n\n /**\n * Divide a string in the user perceived single units\n * @memberOf fabric.util.string\n * @param {String} textstring String to escape\n * @return {Array} array containing the graphemes\n */\n function graphemeSplit(textstring) {\n var i = 0, chr, graphemes = [];\n for (i = 0, chr; i < textstring.length; i++) {\n if ((chr = getWholeChar(textstring, i)) === false) {\n continue;\n }\n graphemes.push(chr);\n }\n return graphemes;\n }\n\n // taken from mdn in the charAt doc page.\n function getWholeChar(str, i) {\n var code = str.charCodeAt(i);\n\n if (isNaN(code)) {\n return ''; // Position not found\n }\n if (code < 0xD800 || code > 0xDFFF) {\n return str.charAt(i);\n }\n\n // High surrogate (could change last hex to 0xDB7F to treat high private\n // surrogates as single characters)\n if (0xD800 <= code && code <= 0xDBFF) {\n if (str.length <= (i + 1)) {\n throw 'High surrogate without following low surrogate';\n }\n var next = str.charCodeAt(i + 1);\n if (0xDC00 > next || next > 0xDFFF) {\n throw 'High surrogate without following low surrogate';\n }\n return str.charAt(i) + str.charAt(i + 1);\n }\n // Low surrogate (0xDC00 <= code && code <= 0xDFFF)\n if (i === 0) {\n throw 'Low surrogate without preceding high surrogate';\n }\n var prev = str.charCodeAt(i - 1);\n\n // (could change last hex to 0xDB7F to treat high private\n // surrogates as single characters)\n if (0xD800 > prev || prev > 0xDBFF) {\n throw 'Low surrogate without preceding high surrogate';\n }\n // We can pass over low surrogates now as the second component\n // in a pair which we have already processed\n return false;\n }\n\n\n /**\n * String utilities\n * @namespace fabric.util.string\n */\n fabric.util.string = {\n camelize: camelize,\n capitalize: capitalize,\n escapeXml: escapeXml,\n graphemeSplit: graphemeSplit\n };\n})();\n\n\n(function() {\n\n var slice = Array.prototype.slice, emptyFunction = function() { },\n\n IS_DONTENUM_BUGGY = (function() {\n for (var p in { toString: 1 }) {\n if (p === 'toString') {\n return false;\n }\n }\n return true;\n })(),\n\n /** @ignore */\n addMethods = function(klass, source, parent) {\n for (var property in source) {\n\n if (property in klass.prototype &&\n typeof klass.prototype[property] === 'function' &&\n (source[property] + '').indexOf('callSuper') > -1) {\n\n klass.prototype[property] = (function(property) {\n return function() {\n\n var superclass = this.constructor.superclass;\n this.constructor.superclass = parent;\n var returnValue = source[property].apply(this, arguments);\n this.constructor.superclass = superclass;\n\n if (property !== 'initialize') {\n return returnValue;\n }\n };\n })(property);\n }\n else {\n klass.prototype[property] = source[property];\n }\n\n if (IS_DONTENUM_BUGGY) {\n if (source.toString !== Object.prototype.toString) {\n klass.prototype.toString = source.toString;\n }\n if (source.valueOf !== Object.prototype.valueOf) {\n klass.prototype.valueOf = source.valueOf;\n }\n }\n }\n };\n\n function Subclass() { }\n\n function callSuper(methodName) {\n var parentMethod = null,\n _this = this;\n\n // climb prototype chain to find method not equal to callee's method\n while (_this.constructor.superclass) {\n var superClassMethod = _this.constructor.superclass.prototype[methodName];\n if (_this[methodName] !== superClassMethod) {\n parentMethod = superClassMethod;\n break;\n }\n // eslint-disable-next-line\n _this = _this.constructor.superclass.prototype;\n }\n\n if (!parentMethod) {\n return console.log('tried to callSuper ' + methodName + ', method not found in prototype chain', this);\n }\n\n return (arguments.length > 1)\n ? parentMethod.apply(this, slice.call(arguments, 1))\n : parentMethod.call(this);\n }\n\n /**\n * Helper for creation of \"classes\".\n * @memberOf fabric.util\n * @param {Function} [parent] optional \"Class\" to inherit from\n * @param {Object} [properties] Properties shared by all instances of this class\n * (be careful modifying objects defined here as this would affect all instances)\n */\n function createClass() {\n var parent = null,\n properties = slice.call(arguments, 0);\n\n if (typeof properties[0] === 'function') {\n parent = properties.shift();\n }\n function klass() {\n this.initialize.apply(this, arguments);\n }\n\n klass.superclass = parent;\n klass.subclasses = [];\n\n if (parent) {\n Subclass.prototype = parent.prototype;\n klass.prototype = new Subclass();\n parent.subclasses.push(klass);\n }\n for (var i = 0, length = properties.length; i < length; i++) {\n addMethods(klass, properties[i], parent);\n }\n if (!klass.prototype.initialize) {\n klass.prototype.initialize = emptyFunction;\n }\n klass.prototype.constructor = klass;\n klass.prototype.callSuper = callSuper;\n return klass;\n }\n\n fabric.util.createClass = createClass;\n})();\n\n\n(function () {\n // since ie11 can use addEventListener but they do not support options, i need to check\n var couldUseAttachEvent = !!fabric.document.createElement('div').attachEvent,\n touchEvents = ['touchstart', 'touchmove', 'touchend'];\n /**\n * Adds an event listener to an element\n * @function\n * @memberOf fabric.util\n * @param {HTMLElement} element\n * @param {String} eventName\n * @param {Function} handler\n */\n fabric.util.addListener = function(element, eventName, handler, options) {\n element && element.addEventListener(eventName, handler, couldUseAttachEvent ? false : options);\n };\n\n /**\n * Removes an event listener from an element\n * @function\n * @memberOf fabric.util\n * @param {HTMLElement} element\n * @param {String} eventName\n * @param {Function} handler\n */\n fabric.util.removeListener = function(element, eventName, handler, options) {\n element && element.removeEventListener(eventName, handler, couldUseAttachEvent ? false : options);\n };\n\n function getTouchInfo(event) {\n var touchProp = event.changedTouches;\n if (touchProp && touchProp[0]) {\n return touchProp[0];\n }\n return event;\n }\n\n fabric.util.getPointer = function(event) {\n var element = event.target,\n scroll = fabric.util.getScrollLeftTop(element),\n _evt = getTouchInfo(event);\n return {\n x: _evt.clientX + scroll.left,\n y: _evt.clientY + scroll.top\n };\n };\n\n fabric.util.isTouchEvent = function(event) {\n return touchEvents.indexOf(event.type) > -1 || event.pointerType === 'touch';\n };\n})();\n\n\n(function () {\n\n /**\n * Cross-browser wrapper for setting element's style\n * @memberOf fabric.util\n * @param {HTMLElement} element\n * @param {Object} styles\n * @return {HTMLElement} Element that was passed as a first argument\n */\n function setStyle(element, styles) {\n var elementStyle = element.style;\n if (!elementStyle) {\n return element;\n }\n if (typeof styles === 'string') {\n element.style.cssText += ';' + styles;\n return styles.indexOf('opacity') > -1\n ? setOpacity(element, styles.match(/opacity:\\s*(\\d?\\.?\\d*)/)[1])\n : element;\n }\n for (var property in styles) {\n if (property === 'opacity') {\n setOpacity(element, styles[property]);\n }\n else {\n var normalizedProperty = (property === 'float' || property === 'cssFloat')\n ? (typeof elementStyle.styleFloat === 'undefined' ? 'cssFloat' : 'styleFloat')\n : property;\n elementStyle[normalizedProperty] = styles[property];\n }\n }\n return element;\n }\n\n var parseEl = fabric.document.createElement('div'),\n supportsOpacity = typeof parseEl.style.opacity === 'string',\n supportsFilters = typeof parseEl.style.filter === 'string',\n reOpacity = /alpha\\s*\\(\\s*opacity\\s*=\\s*([^\\)]+)\\)/,\n\n /** @ignore */\n setOpacity = function (element) { return element; };\n\n if (supportsOpacity) {\n /** @ignore */\n setOpacity = function(element, value) {\n element.style.opacity = value;\n return element;\n };\n }\n else if (supportsFilters) {\n /** @ignore */\n setOpacity = function(element, value) {\n var es = element.style;\n if (element.currentStyle && !element.currentStyle.hasLayout) {\n es.zoom = 1;\n }\n if (reOpacity.test(es.filter)) {\n value = value >= 0.9999 ? '' : ('alpha(opacity=' + (value * 100) + ')');\n es.filter = es.filter.replace(reOpacity, value);\n }\n else {\n es.filter += ' alpha(opacity=' + (value * 100) + ')';\n }\n return element;\n };\n }\n\n fabric.util.setStyle = setStyle;\n\n})();\n\n\n(function() {\n\n var _slice = Array.prototype.slice;\n\n /**\n * Takes id and returns an element with that id (if one exists in a document)\n * @memberOf fabric.util\n * @param {String|HTMLElement} id\n * @return {HTMLElement|null}\n */\n function getById(id) {\n return typeof id === 'string' ? fabric.document.getElementById(id) : id;\n }\n\n var sliceCanConvertNodelists,\n /**\n * Converts an array-like object (e.g. arguments or NodeList) to an array\n * @memberOf fabric.util\n * @param {Object} arrayLike\n * @return {Array}\n */\n toArray = function(arrayLike) {\n return _slice.call(arrayLike, 0);\n };\n\n try {\n sliceCanConvertNodelists = toArray(fabric.document.childNodes) instanceof Array;\n }\n catch (err) { }\n\n if (!sliceCanConvertNodelists) {\n toArray = function(arrayLike) {\n var arr = new Array(arrayLike.length), i = arrayLike.length;\n while (i--) {\n arr[i] = arrayLike[i];\n }\n return arr;\n };\n }\n\n /**\n * Creates specified element with specified attributes\n * @memberOf fabric.util\n * @param {String} tagName Type of an element to create\n * @param {Object} [attributes] Attributes to set on an element\n * @return {HTMLElement} Newly created element\n */\n function makeElement(tagName, attributes) {\n var el = fabric.document.createElement(tagName);\n for (var prop in attributes) {\n if (prop === 'class') {\n el.className = attributes[prop];\n }\n else if (prop === 'for') {\n el.htmlFor = attributes[prop];\n }\n else {\n el.setAttribute(prop, attributes[prop]);\n }\n }\n return el;\n }\n\n /**\n * Adds class to an element\n * @memberOf fabric.util\n * @param {HTMLElement} element Element to add class to\n * @param {String} className Class to add to an element\n */\n function addClass(element, className) {\n if (element && (' ' + element.className + ' ').indexOf(' ' + className + ' ') === -1) {\n element.className += (element.className ? ' ' : '') + className;\n }\n }\n\n /**\n * Wraps element with another element\n * @memberOf fabric.util\n * @param {HTMLElement} element Element to wrap\n * @param {HTMLElement|String} wrapper Element to wrap with\n * @param {Object} [attributes] Attributes to set on a wrapper\n * @return {HTMLElement} wrapper\n */\n function wrapElement(element, wrapper, attributes) {\n if (typeof wrapper === 'string') {\n wrapper = makeElement(wrapper, attributes);\n }\n if (element.parentNode) {\n element.parentNode.replaceChild(wrapper, element);\n }\n wrapper.appendChild(element);\n return wrapper;\n }\n\n /**\n * Returns element scroll offsets\n * @memberOf fabric.util\n * @param {HTMLElement} element Element to operate on\n * @return {Object} Object with left/top values\n */\n function getScrollLeftTop(element) {\n\n var left = 0,\n top = 0,\n docElement = fabric.document.documentElement,\n body = fabric.document.body || {\n scrollLeft: 0, scrollTop: 0\n };\n\n // While loop checks (and then sets element to) .parentNode OR .host\n // to account for ShadowDOM. We still want to traverse up out of ShadowDOM,\n // but the .parentNode of a root ShadowDOM node will always be null, instead\n // it should be accessed through .host. See http://stackoverflow.com/a/24765528/4383938\n while (element && (element.parentNode || element.host)) {\n\n // Set element to element parent, or 'host' in case of ShadowDOM\n element = element.parentNode || element.host;\n\n if (element === fabric.document) {\n left = body.scrollLeft || docElement.scrollLeft || 0;\n top = body.scrollTop || docElement.scrollTop || 0;\n }\n else {\n left += element.scrollLeft || 0;\n top += element.scrollTop || 0;\n }\n\n if (element.nodeType === 1 && element.style.position === 'fixed') {\n break;\n }\n }\n\n return { left: left, top: top };\n }\n\n /**\n * Returns offset for a given element\n * @function\n * @memberOf fabric.util\n * @param {HTMLElement} element Element to get offset for\n * @return {Object} Object with \"left\" and \"top\" properties\n */\n function getElementOffset(element) {\n var docElem,\n doc = element && element.ownerDocument,\n box = { left: 0, top: 0 },\n offset = { left: 0, top: 0 },\n scrollLeftTop,\n offsetAttributes = {\n borderLeftWidth: 'left',\n borderTopWidth: 'top',\n paddingLeft: 'left',\n paddingTop: 'top'\n };\n\n if (!doc) {\n return offset;\n }\n\n for (var attr in offsetAttributes) {\n offset[offsetAttributes[attr]] += parseInt(getElementStyle(element, attr), 10) || 0;\n }\n\n docElem = doc.documentElement;\n if ( typeof element.getBoundingClientRect !== 'undefined' ) {\n box = element.getBoundingClientRect();\n }\n\n scrollLeftTop = getScrollLeftTop(element);\n\n return {\n left: box.left + scrollLeftTop.left - (docElem.clientLeft || 0) + offset.left,\n top: box.top + scrollLeftTop.top - (docElem.clientTop || 0) + offset.top\n };\n }\n\n /**\n * Returns style attribute value of a given element\n * @memberOf fabric.util\n * @param {HTMLElement} element Element to get style attribute for\n * @param {String} attr Style attribute to get for element\n * @return {String} Style attribute value of the given element.\n */\n var getElementStyle;\n if (fabric.document.defaultView && fabric.document.defaultView.getComputedStyle) {\n getElementStyle = function(element, attr) {\n var style = fabric.document.defaultView.getComputedStyle(element, null);\n return style ? style[attr] : undefined;\n };\n }\n else {\n getElementStyle = function(element, attr) {\n var value = element.style[attr];\n if (!value && element.currentStyle) {\n value = element.currentStyle[attr];\n }\n return value;\n };\n }\n\n (function () {\n var style = fabric.document.documentElement.style,\n selectProp = 'userSelect' in style\n ? 'userSelect'\n : 'MozUserSelect' in style\n ? 'MozUserSelect'\n : 'WebkitUserSelect' in style\n ? 'WebkitUserSelect'\n : 'KhtmlUserSelect' in style\n ? 'KhtmlUserSelect'\n : '';\n\n /**\n * Makes element unselectable\n * @memberOf fabric.util\n * @param {HTMLElement} element Element to make unselectable\n * @return {HTMLElement} Element that was passed in\n */\n function makeElementUnselectable(element) {\n if (typeof element.onselectstart !== 'undefined') {\n element.onselectstart = fabric.util.falseFunction;\n }\n if (selectProp) {\n element.style[selectProp] = 'none';\n }\n else if (typeof element.unselectable === 'string') {\n element.unselectable = 'on';\n }\n return element;\n }\n\n /**\n * Makes element selectable\n * @memberOf fabric.util\n * @param {HTMLElement} element Element to make selectable\n * @return {HTMLElement} Element that was passed in\n */\n function makeElementSelectable(element) {\n if (typeof element.onselectstart !== 'undefined') {\n element.onselectstart = null;\n }\n if (selectProp) {\n element.style[selectProp] = '';\n }\n else if (typeof element.unselectable === 'string') {\n element.unselectable = '';\n }\n return element;\n }\n\n fabric.util.makeElementUnselectable = makeElementUnselectable;\n fabric.util.makeElementSelectable = makeElementSelectable;\n })();\n\n function getNodeCanvas(element) {\n var impl = fabric.jsdomImplForWrapper(element);\n return impl._canvas || impl._image;\n };\n\n function cleanUpJsdomNode(element) {\n if (!fabric.isLikelyNode) {\n return;\n }\n var impl = fabric.jsdomImplForWrapper(element);\n if (impl) {\n impl._image = null;\n impl._canvas = null;\n // unsure if necessary\n impl._currentSrc = null;\n impl._attributes = null;\n impl._classList = null;\n }\n }\n\n function setImageSmoothing(ctx, value) {\n ctx.imageSmoothingEnabled = ctx.imageSmoothingEnabled || ctx.webkitImageSmoothingEnabled\n || ctx.mozImageSmoothingEnabled || ctx.msImageSmoothingEnabled || ctx.oImageSmoothingEnabled;\n ctx.imageSmoothingEnabled = value;\n }\n\n /**\n * setImageSmoothing sets the context imageSmoothingEnabled property.\n * Used by canvas and by ImageObject.\n * @memberOf fabric.util\n * @since 4.0.0\n * @param {HTMLRenderingContext2D} ctx to set on\n * @param {Boolean} value true or false\n */\n fabric.util.setImageSmoothing = setImageSmoothing;\n fabric.util.getById = getById;\n fabric.util.toArray = toArray;\n fabric.util.addClass = addClass;\n fabric.util.makeElement = makeElement;\n fabric.util.wrapElement = wrapElement;\n fabric.util.getScrollLeftTop = getScrollLeftTop;\n fabric.util.getElementOffset = getElementOffset;\n fabric.util.getNodeCanvas = getNodeCanvas;\n fabric.util.cleanUpJsdomNode = cleanUpJsdomNode;\n\n})();\n\n\n(function() {\n\n function addParamToUrl(url, param) {\n return url + (/\\?/.test(url) ? '&' : '?') + param;\n }\n\n function emptyFn() { }\n\n /**\n * Cross-browser abstraction for sending XMLHttpRequest\n * @memberOf fabric.util\n * @param {String} url URL to send XMLHttpRequest to\n * @param {Object} [options] Options object\n * @param {String} [options.method=\"GET\"]\n * @param {String} [options.parameters] parameters to append to url in GET or in body\n * @param {String} [options.body] body to send with POST or PUT request\n * @param {Function} options.onComplete Callback to invoke when request is completed\n * @return {XMLHttpRequest} request\n */\n function request(url, options) {\n options || (options = { });\n\n var method = options.method ? options.method.toUpperCase() : 'GET',\n onComplete = options.onComplete || function() { },\n xhr = new fabric.window.XMLHttpRequest(),\n body = options.body || options.parameters;\n\n /** @ignore */\n xhr.onreadystatechange = function() {\n if (xhr.readyState === 4) {\n onComplete(xhr);\n xhr.onreadystatechange = emptyFn;\n }\n };\n\n if (method === 'GET') {\n body = null;\n if (typeof options.parameters === 'string') {\n url = addParamToUrl(url, options.parameters);\n }\n }\n\n xhr.open(method, url, true);\n\n if (method === 'POST' || method === 'PUT') {\n xhr.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');\n }\n\n xhr.send(body);\n return xhr;\n }\n\n fabric.util.request = request;\n})();\n\n\n/**\n * Wrapper around `console.log` (when available)\n * @param {*} [values] Values to log\n */\nfabric.log = console.log;\n\n/**\n * Wrapper around `console.warn` (when available)\n * @param {*} [values] Values to log as a warning\n */\nfabric.warn = console.warn;\n\n\n(function() {\n\n function noop() {\n return false;\n }\n\n function defaultEasing(t, b, c, d) {\n return -c * Math.cos(t / d * (Math.PI / 2)) + c + b;\n }\n\n /**\n * Changes value from one to another within certain period of time, invoking callbacks as value is being changed.\n * @memberOf fabric.util\n * @param {Object} [options] Animation options\n * @param {Function} [options.onChange] Callback; invoked on every value change\n * @param {Function} [options.onComplete] Callback; invoked when value change is completed\n * @param {Number} [options.startValue=0] Starting value\n * @param {Number} [options.endValue=100] Ending value\n * @param {Number} [options.byValue=100] Value to modify the property by\n * @param {Function} [options.easing] Easing function\n * @param {Number} [options.duration=500] Duration of change (in ms)\n * @param {Function} [options.abort] Additional function with logic. If returns true, onComplete is called.\n */\n function animate(options) {\n\n requestAnimFrame(function(timestamp) {\n options || (options = { });\n\n var start = timestamp || +new Date(),\n duration = options.duration || 500,\n finish = start + duration, time,\n onChange = options.onChange || noop,\n abort = options.abort || noop,\n onComplete = options.onComplete || noop,\n easing = options.easing || defaultEasing,\n startValue = 'startValue' in options ? options.startValue : 0,\n endValue = 'endValue' in options ? options.endValue : 100,\n byValue = options.byValue || endValue - startValue;\n\n options.onStart && options.onStart();\n\n (function tick(ticktime) {\n // TODO: move abort call after calculation\n // and pass (current,valuePerc, timePerc) as arguments\n time = ticktime || +new Date();\n var currentTime = time > finish ? duration : (time - start),\n timePerc = currentTime / duration,\n current = easing(currentTime, startValue, byValue, duration),\n valuePerc = Math.abs((current - startValue) / byValue);\n if (abort()) {\n onComplete(endValue, 1, 1);\n return;\n }\n if (time > finish) {\n onChange(endValue, 1, 1);\n onComplete(endValue, 1, 1);\n return;\n }\n else {\n onChange(current, valuePerc, timePerc);\n requestAnimFrame(tick);\n }\n })(start);\n });\n }\n\n var _requestAnimFrame = fabric.window.requestAnimationFrame ||\n fabric.window.webkitRequestAnimationFrame ||\n fabric.window.mozRequestAnimationFrame ||\n fabric.window.oRequestAnimationFrame ||\n fabric.window.msRequestAnimationFrame ||\n function(callback) {\n return fabric.window.setTimeout(callback, 1000 / 60);\n };\n\n var _cancelAnimFrame = fabric.window.cancelAnimationFrame || fabric.window.clearTimeout;\n\n /**\n * requestAnimationFrame polyfill based on http://paulirish.com/2011/requestanimationframe-for-smart-animating/\n * In order to get a precise start time, `requestAnimFrame` should be called as an entry into the method\n * @memberOf fabric.util\n * @param {Function} callback Callback to invoke\n * @param {DOMElement} element optional Element to associate with animation\n */\n function requestAnimFrame() {\n return _requestAnimFrame.apply(fabric.window, arguments);\n }\n\n function cancelAnimFrame() {\n return _cancelAnimFrame.apply(fabric.window, arguments);\n }\n\n fabric.util.animate = animate;\n fabric.util.requestAnimFrame = requestAnimFrame;\n fabric.util.cancelAnimFrame = cancelAnimFrame;\n})();\n\n\n(function() {\n // Calculate an in-between color. Returns a \"rgba()\" string.\n // Credit: Edwin Martin <edwin@bitstorm.org>\n // http://www.bitstorm.org/jquery/color-animation/jquery.animate-colors.js\n function calculateColor(begin, end, pos) {\n var color = 'rgba('\n + parseInt((begin[0] + pos * (end[0] - begin[0])), 10) + ','\n + parseInt((begin[1] + pos * (end[1] - begin[1])), 10) + ','\n + parseInt((begin[2] + pos * (end[2] - begin[2])), 10);\n\n color += ',' + (begin && end ? parseFloat(begin[3] + pos * (end[3] - begin[3])) : 1);\n color += ')';\n return color;\n }\n\n /**\n * Changes the color from one to another within certain period of time, invoking callbacks as value is being changed.\n * @memberOf fabric.util\n * @param {String} fromColor The starting color in hex or rgb(a) format.\n * @param {String} toColor The starting color in hex or rgb(a) format.\n * @param {Number} [duration] Duration of change (in ms).\n * @param {Object} [options] Animation options\n * @param {Function} [options.onChange] Callback; invoked on every value change\n * @param {Function} [options.onComplete] Callback; invoked when value change is completed\n * @param {Function} [options.colorEasing] Easing function. Note that this function only take two arguments (currentTime, duration). Thus the regular animation easing functions cannot be used.\n * @param {Function} [options.abort] Additional function with logic. If returns true, onComplete is called.\n */\n function animateColor(fromColor, toColor, duration, options) {\n var startColor = new fabric.Color(fromColor).getSource(),\n endColor = new fabric.Color(toColor).getSource(),\n originalOnComplete = options.onComplete,\n originalOnChange = options.onChange;\n options = options || {};\n\n fabric.util.animate(fabric.util.object.extend(options, {\n duration: duration || 500,\n startValue: startColor,\n endValue: endColor,\n byValue: endColor,\n easing: function (currentTime, startValue, byValue, duration) {\n var posValue = options.colorEasing\n ? options.colorEasing(currentTime, duration)\n : 1 - Math.cos(currentTime / duration * (Math.PI / 2));\n return calculateColor(startValue, byValue, posValue);\n },\n // has to take in account for color restoring;\n onComplete: function(current, valuePerc, timePerc) {\n if (originalOnComplete) {\n return originalOnComplete(\n calculateColor(endColor, endColor, 0),\n valuePerc,\n timePerc\n );\n }\n },\n onChange: function(current, valuePerc, timePerc) {\n if (originalOnChange) {\n if (Array.isArray(current)) {\n return originalOnChange(\n calculateColor(current, current, 0),\n valuePerc,\n timePerc\n );\n }\n originalOnChange(current, valuePerc, timePerc);\n }\n }\n }));\n }\n\n fabric.util.animateColor = animateColor;\n\n})();\n\n\n(function() {\n\n function normalize(a, c, p, s) {\n if (a < Math.abs(c)) {\n a = c;\n s = p / 4;\n }\n else {\n //handle the 0/0 case:\n if (c === 0 && a === 0) {\n s = p / (2 * Math.PI) * Math.asin(1);\n }\n else {\n s = p / (2 * Math.PI) * Math.asin(c / a);\n }\n }\n return { a: a, c: c, p: p, s: s };\n }\n\n function elastic(opts, t, d) {\n return opts.a *\n Math.pow(2, 10 * (t -= 1)) *\n Math.sin( (t * d - opts.s) * (2 * Math.PI) / opts.p );\n }\n\n /**\n * Cubic easing out\n * @memberOf fabric.util.ease\n */\n function easeOutCubic(t, b, c, d) {\n return c * ((t = t / d - 1) * t * t + 1) + b;\n }\n\n /**\n * Cubic easing in and out\n * @memberOf fabric.util.ease\n */\n function easeInOutCubic(t, b, c, d) {\n t /= d / 2;\n if (t < 1) {\n return c / 2 * t * t * t + b;\n }\n return c / 2 * ((t -= 2) * t * t + 2) + b;\n }\n\n /**\n * Quartic easing in\n * @memberOf fabric.util.ease\n */\n function easeInQuart(t, b, c, d) {\n return c * (t /= d) * t * t * t + b;\n }\n\n /**\n * Quartic easing out\n * @memberOf fabric.util.ease\n */\n function easeOutQuart(t, b, c, d) {\n return -c * ((t = t / d - 1) * t * t * t - 1) + b;\n }\n\n /**\n * Quartic easing in and out\n * @memberOf fabric.util.ease\n */\n function easeInOutQuart(t, b, c, d) {\n t /= d / 2;\n if (t < 1) {\n return c / 2 * t * t * t * t + b;\n }\n return -c / 2 * ((t -= 2) * t * t * t - 2) + b;\n }\n\n /**\n * Quintic easing in\n * @memberOf fabric.util.ease\n */\n function easeInQuint(t, b, c, d) {\n return c * (t /= d) * t * t * t * t + b;\n }\n\n /**\n * Quintic easing out\n * @memberOf fabric.util.ease\n */\n function easeOutQuint(t, b, c, d) {\n return c * ((t = t / d - 1) * t * t * t * t + 1) + b;\n }\n\n /**\n * Quintic easing in and out\n * @memberOf fabric.util.ease\n */\n function easeInOutQuint(t, b, c, d) {\n t /= d / 2;\n if (t < 1) {\n return c / 2 * t * t * t * t * t + b;\n }\n return c / 2 * ((t -= 2) * t * t * t * t + 2) + b;\n }\n\n /**\n * Sinusoidal easing in\n * @memberOf fabric.util.ease\n */\n function easeInSine(t, b, c, d) {\n return -c * Math.cos(t / d * (Math.PI / 2)) + c + b;\n }\n\n /**\n * Sinusoidal easing out\n * @memberOf fabric.util.ease\n */\n function easeOutSine(t, b, c, d) {\n return c * Math.sin(t / d * (Math.PI / 2)) + b;\n }\n\n /**\n * Sinusoidal easing in and out\n * @memberOf fabric.util.ease\n */\n function easeInOutSine(t, b, c, d) {\n return -c / 2 * (Math.cos(Math.PI * t / d) - 1) + b;\n }\n\n /**\n * Exponential easing in\n * @memberOf fabric.util.ease\n */\n function easeInExpo(t, b, c, d) {\n return (t === 0) ? b : c * Math.pow(2, 10 * (t / d - 1)) + b;\n }\n\n /**\n * Exponential easing out\n * @memberOf fabric.util.ease\n */\n function easeOutExpo(t, b, c, d) {\n return (t === d) ? b + c : c * (-Math.pow(2, -10 * t / d) + 1) + b;\n }\n\n /**\n * Exponential easing in and out\n * @memberOf fabric.util.ease\n */\n function easeInOutExpo(t, b, c, d) {\n if (t === 0) {\n return b;\n }\n if (t === d) {\n return b + c;\n }\n t /= d / 2;\n if (t < 1) {\n return c / 2 * Math.pow(2, 10 * (t - 1)) + b;\n }\n return c / 2 * (-Math.pow(2, -10 * --t) + 2) + b;\n }\n\n /**\n * Circular easing in\n * @memberOf fabric.util.ease\n */\n function easeInCirc(t, b, c, d) {\n return -c * (Math.sqrt(1 - (t /= d) * t) - 1) + b;\n }\n\n /**\n * Circular easing out\n * @memberOf fabric.util.ease\n */\n function easeOutCirc(t, b, c, d) {\n return c * Math.sqrt(1 - (t = t / d - 1) * t) + b;\n }\n\n /**\n * Circular easing in and out\n * @memberOf fabric.util.ease\n */\n function easeInOutCirc(t, b, c, d) {\n t /= d / 2;\n if (t < 1) {\n return -c / 2 * (Math.sqrt(1 - t * t) - 1) + b;\n }\n return c / 2 * (Math.sqrt(1 - (t -= 2) * t) + 1) + b;\n }\n\n /**\n * Elastic easing in\n * @memberOf fabric.util.ease\n */\n function easeInElastic(t, b, c, d) {\n var s = 1.70158, p = 0, a = c;\n if (t === 0) {\n return b;\n }\n t /= d;\n if (t === 1) {\n return b + c;\n }\n if (!p) {\n p = d * 0.3;\n }\n var opts = normalize(a, c, p, s);\n return -elastic(opts, t, d) + b;\n }\n\n /**\n * Elastic easing out\n * @memberOf fabric.util.ease\n */\n function easeOutElastic(t, b, c, d) {\n var s = 1.70158, p = 0, a = c;\n if (t === 0) {\n return b;\n }\n t /= d;\n if (t === 1) {\n return b + c;\n }\n if (!p) {\n p = d * 0.3;\n }\n var opts = normalize(a, c, p, s);\n return opts.a * Math.pow(2, -10 * t) * Math.sin((t * d - opts.s) * (2 * Math.PI) / opts.p ) + opts.c + b;\n }\n\n /**\n * Elastic easing in and out\n * @memberOf fabric.util.ease\n */\n function easeInOutElastic(t, b, c, d) {\n var s = 1.70158, p = 0, a = c;\n if (t === 0) {\n return b;\n }\n t /= d / 2;\n if (t === 2) {\n return b + c;\n }\n if (!p) {\n p = d * (0.3 * 1.5);\n }\n var opts = normalize(a, c, p, s);\n if (t < 1) {\n return -0.5 * elastic(opts, t, d) + b;\n }\n return opts.a * Math.pow(2, -10 * (t -= 1)) *\n Math.sin((t * d - opts.s) * (2 * Math.PI) / opts.p ) * 0.5 + opts.c + b;\n }\n\n /**\n * Backwards easing in\n * @memberOf fabric.util.ease\n */\n function easeInBack(t, b, c, d, s) {\n if (s === undefined) {\n s = 1.70158;\n }\n return c * (t /= d) * t * ((s + 1) * t - s) + b;\n }\n\n /**\n * Backwards easing out\n * @memberOf fabric.util.ease\n */\n function easeOutBack(t, b, c, d, s) {\n if (s === undefined) {\n s = 1.70158;\n }\n return c * ((t = t / d - 1) * t * ((s + 1) * t + s) + 1) + b;\n }\n\n /**\n * Backwards easing in and out\n * @memberOf fabric.util.ease\n */\n function easeInOutBack(t, b, c, d, s) {\n if (s === undefined) {\n s = 1.70158;\n }\n t /= d / 2;\n if (t < 1) {\n return c / 2 * (t * t * (((s *= (1.525)) + 1) * t - s)) + b;\n }\n return c / 2 * ((t -= 2) * t * (((s *= (1.525)) + 1) * t + s) + 2) + b;\n }\n\n /**\n * Bouncing easing in\n * @memberOf fabric.util.ease\n */\n function easeInBounce(t, b, c, d) {\n return c - easeOutBounce (d - t, 0, c, d) + b;\n }\n\n /**\n * Bouncing easing out\n * @memberOf fabric.util.ease\n */\n function easeOutBounce(t, b, c, d) {\n if ((t /= d) < (1 / 2.75)) {\n return c * (7.5625 * t * t) + b;\n }\n else if (t < (2 / 2.75)) {\n return c * (7.5625 * (t -= (1.5 / 2.75)) * t + 0.75) + b;\n }\n else if (t < (2.5 / 2.75)) {\n return c * (7.5625 * (t -= (2.25 / 2.75)) * t + 0.9375) + b;\n }\n else {\n return c * (7.5625 * (t -= (2.625 / 2.75)) * t + 0.984375) + b;\n }\n }\n\n /**\n * Bouncing easing in and out\n * @memberOf fabric.util.ease\n */\n function easeInOutBounce(t, b, c, d) {\n if (t < d / 2) {\n return easeInBounce (t * 2, 0, c, d) * 0.5 + b;\n }\n return easeOutBounce(t * 2 - d, 0, c, d) * 0.5 + c * 0.5 + b;\n }\n\n /**\n * Easing functions\n * See <a href=\"http://gizma.com/easing/\">Easing Equations by Robert Penner</a>\n * @namespace fabric.util.ease\n */\n fabric.util.ease = {\n\n /**\n * Quadratic easing in\n * @memberOf fabric.util.ease\n */\n easeInQuad: function(t, b, c, d) {\n return c * (t /= d) * t + b;\n },\n\n /**\n * Quadratic easing out\n * @memberOf fabric.util.ease\n */\n easeOutQuad: function(t, b, c, d) {\n return -c * (t /= d) * (t - 2) + b;\n },\n\n /**\n * Quadratic easing in and out\n * @memberOf fabric.util.ease\n */\n easeInOutQuad: function(t, b, c, d) {\n t /= (d / 2);\n if (t < 1) {\n return c / 2 * t * t + b;\n }\n return -c / 2 * ((--t) * (t - 2) - 1) + b;\n },\n\n /**\n * Cubic easing in\n * @memberOf fabric.util.ease\n */\n easeInCubic: function(t, b, c, d) {\n return c * (t /= d) * t * t + b;\n },\n\n easeOutCubic: easeOutCubic,\n easeInOutCubic: easeInOutCubic,\n easeInQuart: easeInQuart,\n easeOutQuart: easeOutQuart,\n easeInOutQuart: easeInOutQuart,\n easeInQuint: easeInQuint,\n easeOutQuint: easeOutQuint,\n easeInOutQuint: easeInOutQuint,\n easeInSine: easeInSine,\n easeOutSine: easeOutSine,\n easeInOutSine: easeInOutSine,\n easeInExpo: easeInExpo,\n easeOutExpo: easeOutExpo,\n easeInOutExpo: easeInOutExpo,\n easeInCirc: easeInCirc,\n easeOutCirc: easeOutCirc,\n easeInOutCirc: easeInOutCirc,\n easeInElastic: easeInElastic,\n easeOutElastic: easeOutElastic,\n easeInOutElastic: easeInOutElastic,\n easeInBack: easeInBack,\n easeOutBack: easeOutBack,\n easeInOutBack: easeInOutBack,\n easeInBounce: easeInBounce,\n easeOutBounce: easeOutBounce,\n easeInOutBounce: easeInOutBounce\n };\n\n})();\n\n\n(function(global) {\n\n 'use strict';\n\n /**\n * @name fabric\n * @namespace\n */\n\n var fabric = global.fabric || (global.fabric = { }),\n extend = fabric.util.object.extend,\n clone = fabric.util.object.clone,\n toFixed = fabric.util.toFixed,\n parseUnit = fabric.util.parseUnit,\n multiplyTransformMatrices = fabric.util.multiplyTransformMatrices,\n\n svgValidTagNames = ['path', 'circle', 'polygon', 'polyline', 'ellipse', 'rect', 'line',\n 'image', 'text'],\n svgViewBoxElements = ['symbol', 'image', 'marker', 'pattern', 'view', 'svg'],\n svgInvalidAncestors = ['pattern', 'defs', 'symbol', 'metadata', 'clipPath', 'mask', 'desc'],\n svgValidParents = ['symbol', 'g', 'a', 'svg', 'clipPath', 'defs'],\n\n attributesMap = {\n cx: 'left',\n x: 'left',\n r: 'radius',\n cy: 'top',\n y: 'top',\n display: 'visible',\n visibility: 'visible',\n transform: 'transformMatrix',\n 'fill-opacity': 'fillOpacity',\n 'fill-rule': 'fillRule',\n 'font-family': 'fontFamily',\n 'font-size': 'fontSize',\n 'font-style': 'fontStyle',\n 'font-weight': 'fontWeight',\n 'letter-spacing': 'charSpacing',\n 'paint-order': 'paintFirst',\n 'stroke-dasharray': 'strokeDashArray',\n 'stroke-dashoffset': 'strokeDashOffset',\n 'stroke-linecap': 'strokeLineCap',\n 'stroke-linejoin': 'strokeLineJoin',\n 'stroke-miterlimit': 'strokeMiterLimit',\n 'stroke-opacity': 'strokeOpacity',\n 'stroke-width': 'strokeWidth',\n 'text-decoration': 'textDecoration',\n 'text-anchor': 'textAnchor',\n opacity: 'opacity',\n 'clip-path': 'clipPath',\n 'clip-rule': 'clipRule',\n 'vector-effect': 'strokeUniform',\n 'image-rendering': 'imageSmoothing',\n },\n\n colorAttributes = {\n stroke: 'strokeOpacity',\n fill: 'fillOpacity'\n },\n\n fSize = 'font-size', cPath = 'clip-path';\n\n fabric.svgValidTagNamesRegEx = getSvgRegex(svgValidTagNames);\n fabric.svgViewBoxElementsRegEx = getSvgRegex(svgViewBoxElements);\n fabric.svgInvalidAncestorsRegEx = getSvgRegex(svgInvalidAncestors);\n fabric.svgValidParentsRegEx = getSvgRegex(svgValidParents);\n\n fabric.cssRules = { };\n fabric.gradientDefs = { };\n fabric.clipPaths = { };\n\n function normalizeAttr(attr) {\n // transform attribute names\n if (attr in attributesMap) {\n return attributesMap[attr];\n }\n return attr;\n }\n\n function normalizeValue(attr, value, parentAttributes, fontSize) {\n var isArray = Object.prototype.toString.call(value) === '[object Array]',\n parsed;\n\n if ((attr === 'fill' || attr === 'stroke') && value === 'none') {\n value = '';\n }\n else if (attr === 'strokeUniform') {\n return (value === 'non-scaling-stroke');\n }\n else if (attr === 'strokeDashArray') {\n if (value === 'none') {\n value = null;\n }\n else {\n value = value.replace(/,/g, ' ').split(/\\s+/).map(parseFloat);\n }\n }\n else if (attr === 'transformMatrix') {\n if (parentAttributes && parentAttributes.transformMatrix) {\n value = multiplyTransformMatrices(\n parentAttributes.transformMatrix, fabric.parseTransformAttribute(value));\n }\n else {\n value = fabric.parseTransformAttribute(value);\n }\n }\n else if (attr === 'visible') {\n value = value !== 'none' && value !== 'hidden';\n // display=none on parent element always takes precedence over child element\n if (parentAttributes && parentAttributes.visible === false) {\n value = false;\n }\n }\n else if (attr === 'opacity') {\n value = parseFloat(value);\n if (parentAttributes && typeof parentAttributes.opacity !== 'undefined') {\n value *= parentAttributes.opacity;\n }\n }\n else if (attr === 'textAnchor' /* text-anchor */) {\n value = value === 'start' ? 'left' : value === 'end' ? 'right' : 'center';\n }\n else if (attr === 'charSpacing') {\n // parseUnit returns px and we convert it to em\n parsed = parseUnit(value, fontSize) / fontSize * 1000;\n }\n else if (attr === 'paintFirst') {\n var fillIndex = value.indexOf('fill');\n var strokeIndex = value.indexOf('stroke');\n var value = 'fill';\n if (fillIndex > -1 && strokeIndex > -1 && strokeIndex < fillIndex) {\n value = 'stroke';\n }\n else if (fillIndex === -1 && strokeIndex > -1) {\n value = 'stroke';\n }\n }\n else if (attr === 'href' || attr === 'xlink:href' || attr === 'font') {\n return value;\n }\n else if (attr === 'imageSmoothing') {\n return (value === 'optimizeQuality' ? true : false);\n }\n else {\n parsed = isArray ? value.map(parseUnit) : parseUnit(value, fontSize);\n }\n\n return (!isArray && isNaN(parsed) ? value : parsed);\n }\n\n /**\n * @private\n */\n function getSvgRegex(arr) {\n return new RegExp('^(' + arr.join('|') + ')\\\\b', 'i');\n }\n\n /**\n * @private\n * @param {Object} attributes Array of attributes to parse\n */\n function _setStrokeFillOpacity(attributes) {\n for (var attr in colorAttributes) {\n\n if (typeof attributes[colorAttributes[attr]] === 'undefined' || attributes[attr] === '') {\n continue;\n }\n\n if (typeof attributes[attr] === 'undefined') {\n if (!fabric.Object.prototype[attr]) {\n continue;\n }\n attributes[attr] = fabric.Object.prototype[attr];\n }\n\n if (attributes[attr].indexOf('url(') === 0) {\n continue;\n }\n\n var color = new fabric.Color(attributes[attr]);\n attributes[attr] = color.setAlpha(toFixed(color.getAlpha() * attributes[colorAttributes[attr]], 2)).toRgba();\n }\n return attributes;\n }\n\n /**\n * @private\n */\n function _getMultipleNodes(doc, nodeNames) {\n var nodeName, nodeArray = [], nodeList, i, len;\n for (i = 0, len = nodeNames.length; i < len; i++) {\n nodeName = nodeNames[i];\n nodeList = doc.getElementsByTagName(nodeName);\n nodeArray = nodeArray.concat(Array.prototype.slice.call(nodeList));\n }\n return nodeArray;\n }\n\n /**\n * Parses \"transform\" attribute, returning an array of values\n * @static\n * @function\n * @memberOf fabric\n * @param {String} attributeValue String containing attribute value\n * @return {Array} Array of 6 elements representing transformation matrix\n */\n fabric.parseTransformAttribute = (function() {\n function rotateMatrix(matrix, args) {\n var cos = fabric.util.cos(args[0]), sin = fabric.util.sin(args[0]),\n x = 0, y = 0;\n if (args.length === 3) {\n x = args[1];\n y = args[2];\n }\n\n matrix[0] = cos;\n matrix[1] = sin;\n matrix[2] = -sin;\n matrix[3] = cos;\n matrix[4] = x - (cos * x - sin * y);\n matrix[5] = y - (sin * x + cos * y);\n }\n\n function scaleMatrix(matrix, args) {\n var multiplierX = args[0],\n multiplierY = (args.length === 2) ? args[1] : args[0];\n\n matrix[0] = multiplierX;\n matrix[3] = multiplierY;\n }\n\n function skewMatrix(matrix, args, pos) {\n matrix[pos] = Math.tan(fabric.util.degreesToRadians(args[0]));\n }\n\n function translateMatrix(matrix, args) {\n matrix[4] = args[0];\n if (args.length === 2) {\n matrix[5] = args[1];\n }\n }\n\n // identity matrix\n var iMatrix = fabric.iMatrix,\n\n // == begin transform regexp\n number = fabric.reNum,\n\n commaWsp = fabric.commaWsp,\n\n skewX = '(?:(skewX)\\\\s*\\\\(\\\\s*(' + number + ')\\\\s*\\\\))',\n\n skewY = '(?:(skewY)\\\\s*\\\\(\\\\s*(' + number + ')\\\\s*\\\\))',\n\n rotate = '(?:(rotate)\\\\s*\\\\(\\\\s*(' + number + ')(?:' +\n commaWsp + '(' + number + ')' +\n commaWsp + '(' + number + '))?\\\\s*\\\\))',\n\n scale = '(?:(scale)\\\\s*\\\\(\\\\s*(' + number + ')(?:' +\n commaWsp + '(' + number + '))?\\\\s*\\\\))',\n\n translate = '(?:(translate)\\\\s*\\\\(\\\\s*(' + number + ')(?:' +\n commaWsp + '(' + number + '))?\\\\s*\\\\))',\n\n matrix = '(?:(matrix)\\\\s*\\\\(\\\\s*' +\n '(' + number + ')' + commaWsp +\n '(' + number + ')' + commaWsp +\n '(' + number + ')' + commaWsp +\n '(' + number + ')' + commaWsp +\n '(' + number + ')' + commaWsp +\n '(' + number + ')' +\n '\\\\s*\\\\))',\n\n transform = '(?:' +\n matrix + '|' +\n translate + '|' +\n scale + '|' +\n rotate + '|' +\n skewX + '|' +\n skewY +\n ')',\n\n transforms = '(?:' + transform + '(?:' + commaWsp + '*' + transform + ')*' + ')',\n\n transformList = '^\\\\s*(?:' + transforms + '?)\\\\s*$',\n\n // http://www.w3.org/TR/SVG/coords.html#TransformAttribute\n reTransformList = new RegExp(transformList),\n // == end transform regexp\n\n reTransform = new RegExp(transform, 'g');\n\n return function(attributeValue) {\n\n // start with identity matrix\n var matrix = iMatrix.concat(),\n matrices = [];\n\n // return if no argument was given or\n // an argument does not match transform attribute regexp\n if (!attributeValue || (attributeValue && !reTransformList.test(attributeValue))) {\n return matrix;\n }\n\n attributeValue.replace(reTransform, function(match) {\n\n var m = new RegExp(transform).exec(match).filter(function (match) {\n // match !== '' && match != null\n return (!!match);\n }),\n operation = m[1],\n args = m.slice(2).map(parseFloat);\n\n switch (operation) {\n case 'translate':\n translateMatrix(matrix, args);\n break;\n case 'rotate':\n args[0] = fabric.util.degreesToRadians(args[0]);\n rotateMatrix(matrix, args);\n break;\n case 'scale':\n scaleMatrix(matrix, args);\n break;\n case 'skewX':\n skewMatrix(matrix, args, 2);\n break;\n case 'skewY':\n skewMatrix(matrix, args, 1);\n break;\n case 'matrix':\n matrix = args;\n break;\n }\n\n // snapshot current matrix into matrices array\n matrices.push(matrix.concat());\n // reset\n matrix = iMatrix.concat();\n });\n\n var combinedMatrix = matrices[0];\n while (matrices.length > 1) {\n matrices.shift();\n combinedMatrix = fabric.util.multiplyTransformMatrices(combinedMatrix, matrices[0]);\n }\n return combinedMatrix;\n };\n })();\n\n /**\n * @private\n */\n function parseStyleString(style, oStyle) {\n var attr, value;\n style.replace(/;\\s*$/, '').split(';').forEach(function (chunk) {\n var pair = chunk.split(':');\n\n attr = pair[0].trim().toLowerCase();\n value = pair[1].trim();\n\n oStyle[attr] = value;\n });\n }\n\n /**\n * @private\n */\n function parseStyleObject(style, oStyle) {\n var attr, value;\n for (var prop in style) {\n if (typeof style[prop] === 'undefined') {\n continue;\n }\n\n attr = prop.toLowerCase();\n value = style[prop];\n\n oStyle[attr] = value;\n }\n }\n\n /**\n * @private\n */\n function getGlobalStylesForElement(element, svgUid) {\n var styles = { };\n for (var rule in fabric.cssRules[svgUid]) {\n if (elementMatchesRule(element, rule.split(' '))) {\n for (var property in fabric.cssRules[svgUid][rule]) {\n styles[property] = fabric.cssRules[svgUid][rule][property];\n }\n }\n }\n return styles;\n }\n\n /**\n * @private\n */\n function elementMatchesRule(element, selectors) {\n var firstMatching, parentMatching = true;\n //start from rightmost selector.\n firstMatching = selectorMatches(element, selectors.pop());\n if (firstMatching && selectors.length) {\n parentMatching = doesSomeParentMatch(element, selectors);\n }\n return firstMatching && parentMatching && (selectors.length === 0);\n }\n\n function doesSomeParentMatch(element, selectors) {\n var selector, parentMatching = true;\n while (element.parentNode && element.parentNode.nodeType === 1 && selectors.length) {\n if (parentMatching) {\n selector = selectors.pop();\n }\n element = element.parentNode;\n parentMatching = selectorMatches(element, selector);\n }\n return selectors.length === 0;\n }\n\n /**\n * @private\n */\n function selectorMatches(element, selector) {\n var nodeName = element.nodeName,\n classNames = element.getAttribute('class'),\n id = element.getAttribute('id'), matcher, i;\n // i check if a selector matches slicing away part from it.\n // if i get empty string i should match\n matcher = new RegExp('^' + nodeName, 'i');\n selector = selector.replace(matcher, '');\n if (id && selector.length) {\n matcher = new RegExp('#' + id + '(?![a-zA-Z\\\\-]+)', 'i');\n selector = selector.replace(matcher, '');\n }\n if (classNames && selector.length) {\n classNames = classNames.split(' ');\n for (i = classNames.length; i--;) {\n matcher = new RegExp('\\\\.' + classNames[i] + '(?![a-zA-Z\\\\-]+)', 'i');\n selector = selector.replace(matcher, '');\n }\n }\n return selector.length === 0;\n }\n\n /**\n * @private\n * to support IE8 missing getElementById on SVGdocument and on node xmlDOM\n */\n function elementById(doc, id) {\n var el;\n doc.getElementById && (el = doc.getElementById(id));\n if (el) {\n return el;\n }\n var node, i, len, nodelist = doc.getElementsByTagName('*');\n for (i = 0, len = nodelist.length; i < len; i++) {\n node = nodelist[i];\n if (id === node.getAttribute('id')) {\n return node;\n }\n }\n }\n\n /**\n * @private\n */\n function parseUseDirectives(doc) {\n var nodelist = _getMultipleNodes(doc, ['use', 'svg:use']), i = 0;\n while (nodelist.length && i < nodelist.length) {\n var el = nodelist[i],\n xlink = (el.getAttribute('xlink:href') || el.getAttribute('href')).substr(1),\n x = el.getAttribute('x') || 0,\n y = el.getAttribute('y') || 0,\n el2 = elementById(doc, xlink).cloneNode(true),\n currentTrans = (el2.getAttribute('transform') || '') + ' translate(' + x + ', ' + y + ')',\n parentNode, oldLength = nodelist.length, attr, j, attrs, len, namespace = fabric.svgNS;\n\n applyViewboxTransform(el2);\n if (/^svg$/i.test(el2.nodeName)) {\n var el3 = el2.ownerDocument.createElementNS(namespace, 'g');\n for (j = 0, attrs = el2.attributes, len = attrs.length; j < len; j++) {\n attr = attrs.item(j);\n el3.setAttributeNS(namespace, attr.nodeName, attr.nodeValue);\n }\n // el2.firstChild != null\n while (el2.firstChild) {\n el3.appendChild(el2.firstChild);\n }\n el2 = el3;\n }\n\n for (j = 0, attrs = el.attributes, len = attrs.length; j < len; j++) {\n attr = attrs.item(j);\n if (attr.nodeName === 'x' || attr.nodeName === 'y' ||\n attr.nodeName === 'xlink:href' || attr.nodeName === 'href') {\n continue;\n }\n\n if (attr.nodeName === 'transform') {\n currentTrans = attr.nodeValue + ' ' + currentTrans;\n }\n else {\n el2.setAttribute(attr.nodeName, attr.nodeValue);\n }\n }\n\n el2.setAttribute('transform', currentTrans);\n el2.setAttribute('instantiated_by_use', '1');\n el2.removeAttribute('id');\n parentNode = el.parentNode;\n parentNode.replaceChild(el2, el);\n // some browsers do not shorten nodelist after replaceChild (IE8)\n if (nodelist.length === oldLength) {\n i++;\n }\n }\n }\n\n // http://www.w3.org/TR/SVG/coords.html#ViewBoxAttribute\n // matches, e.g.: +14.56e-12, etc.\n var reViewBoxAttrValue = new RegExp(\n '^' +\n '\\\\s*(' + fabric.reNum + '+)\\\\s*,?' +\n '\\\\s*(' + fabric.reNum + '+)\\\\s*,?' +\n '\\\\s*(' + fabric.reNum + '+)\\\\s*,?' +\n '\\\\s*(' + fabric.reNum + '+)\\\\s*' +\n '$'\n );\n\n /**\n * Add a <g> element that envelop all child elements and makes the viewbox transformMatrix descend on all elements\n */\n function applyViewboxTransform(element) {\n if (!fabric.svgViewBoxElementsRegEx.test(element.nodeName)) {\n return;\n }\n var viewBoxAttr = element.getAttribute('viewBox'),\n scaleX = 1,\n scaleY = 1,\n minX = 0,\n minY = 0,\n viewBoxWidth, viewBoxHeight, matrix, el,\n widthAttr = element.getAttribute('width'),\n heightAttr = element.getAttribute('height'),\n x = element.getAttribute('x') || 0,\n y = element.getAttribute('y') || 0,\n preserveAspectRatio = element.getAttribute('preserveAspectRatio') || '',\n missingViewBox = (!viewBoxAttr || !(viewBoxAttr = viewBoxAttr.match(reViewBoxAttrValue))),\n missingDimAttr = (!widthAttr || !heightAttr || widthAttr === '100%' || heightAttr === '100%'),\n toBeParsed = missingViewBox && missingDimAttr,\n parsedDim = { }, translateMatrix = '', widthDiff = 0, heightDiff = 0;\n\n parsedDim.width = 0;\n parsedDim.height = 0;\n parsedDim.toBeParsed = toBeParsed;\n\n if (missingViewBox) {\n if (((x || y) && element.parentNode.nodeName !== '#document')) {\n translateMatrix = ' translate(' + parseUnit(x) + ' ' + parseUnit(y) + ') ';\n matrix = (element.getAttribute('transform') || '') + translateMatrix;\n element.setAttribute('transform', matrix);\n element.removeAttribute('x');\n element.removeAttribute('y');\n }\n }\n\n if (toBeParsed) {\n return parsedDim;\n }\n\n if (missingViewBox) {\n parsedDim.width = parseUnit(widthAttr);\n parsedDim.height = parseUnit(heightAttr);\n // set a transform for elements that have x y and are inner(only) SVGs\n return parsedDim;\n }\n minX = -parseFloat(viewBoxAttr[1]);\n minY = -parseFloat(viewBoxAttr[2]);\n viewBoxWidth = parseFloat(viewBoxAttr[3]);\n viewBoxHeight = parseFloat(viewBoxAttr[4]);\n parsedDim.minX = minX;\n parsedDim.minY = minY;\n parsedDim.viewBoxWidth = viewBoxWidth;\n parsedDim.viewBoxHeight = viewBoxHeight;\n if (!missingDimAttr) {\n parsedDim.width = parseUnit(widthAttr);\n parsedDim.height = parseUnit(heightAttr);\n scaleX = parsedDim.width / viewBoxWidth;\n scaleY = parsedDim.height / viewBoxHeight;\n }\n else {\n parsedDim.width = viewBoxWidth;\n parsedDim.height = viewBoxHeight;\n }\n\n // default is to preserve aspect ratio\n preserveAspectRatio = fabric.util.parsePreserveAspectRatioAttribute(preserveAspectRatio);\n if (preserveAspectRatio.alignX !== 'none') {\n //translate all container for the effect of Mid, Min, Max\n if (preserveAspectRatio.meetOrSlice === 'meet') {\n scaleY = scaleX = (scaleX > scaleY ? scaleY : scaleX);\n // calculate additional translation to move the viewbox\n }\n if (preserveAspectRatio.meetOrSlice === 'slice') {\n scaleY = scaleX = (scaleX > scaleY ? scaleX : scaleY);\n // calculate additional translation to move the viewbox\n }\n widthDiff = parsedDim.width - viewBoxWidth * scaleX;\n heightDiff = parsedDim.height - viewBoxHeight * scaleX;\n if (preserveAspectRatio.alignX === 'Mid') {\n widthDiff /= 2;\n }\n if (preserveAspectRatio.alignY === 'Mid') {\n heightDiff /= 2;\n }\n if (preserveAspectRatio.alignX === 'Min') {\n widthDiff = 0;\n }\n if (preserveAspectRatio.alignY === 'Min') {\n heightDiff = 0;\n }\n }\n\n if (scaleX === 1 && scaleY === 1 && minX === 0 && minY === 0 && x === 0 && y === 0) {\n return parsedDim;\n }\n if ((x || y) && element.parentNode.nodeName !== '#document') {\n translateMatrix = ' translate(' + parseUnit(x) + ' ' + parseUnit(y) + ') ';\n }\n\n matrix = translateMatrix + ' matrix(' + scaleX +\n ' 0' +\n ' 0 ' +\n scaleY + ' ' +\n (minX * scaleX + widthDiff) + ' ' +\n (minY * scaleY + heightDiff) + ') ';\n // seems unused.\n // parsedDim.viewboxTransform = fabric.parseTransformAttribute(matrix);\n if (element.nodeName === 'svg') {\n el = element.ownerDocument.createElementNS(fabric.svgNS, 'g');\n // element.firstChild != null\n while (element.firstChild) {\n el.appendChild(element.firstChild);\n }\n element.appendChild(el);\n }\n else {\n el = element;\n el.removeAttribute('x');\n el.removeAttribute('y');\n matrix = el.getAttribute('transform') + matrix;\n }\n el.setAttribute('transform', matrix);\n return parsedDim;\n }\n\n function hasAncestorWithNodeName(element, nodeName) {\n while (element && (element = element.parentNode)) {\n if (element.nodeName && nodeName.test(element.nodeName.replace('svg:', ''))\n && !element.getAttribute('instantiated_by_use')) {\n return true;\n }\n }\n return false;\n }\n\n /**\n * Parses an SVG document, converts it to an array of corresponding fabric.* instances and passes them to a callback\n * @static\n * @function\n * @memberOf fabric\n * @param {SVGDocument} doc SVG document to parse\n * @param {Function} callback Callback to call when parsing is finished;\n * It's being passed an array of elements (parsed from a document).\n * @param {Function} [reviver] Method for further parsing of SVG elements, called after each fabric object created.\n * @param {Object} [parsingOptions] options for parsing document\n * @param {String} [parsingOptions.crossOrigin] crossOrigin settings\n */\n fabric.parseSVGDocument = function(doc, callback, reviver, parsingOptions) {\n if (!doc) {\n return;\n }\n\n parseUseDirectives(doc);\n\n var svgUid = fabric.Object.__uid++, i, len,\n options = applyViewboxTransform(doc),\n descendants = fabric.util.toArray(doc.getElementsByTagName('*'));\n options.crossOrigin = parsingOptions && parsingOptions.crossOrigin;\n options.svgUid = svgUid;\n\n if (descendants.length === 0 && fabric.isLikelyNode) {\n // we're likely in node, where \"o3-xml\" library fails to gEBTN(\"*\")\n // https://github.com/ajaxorg/node-o3-xml/issues/21\n descendants = doc.selectNodes('//*[name(.)!=\"svg\"]');\n var arr = [];\n for (i = 0, len = descendants.length; i < len; i++) {\n arr[i] = descendants[i];\n }\n descendants = arr;\n }\n\n var elements = descendants.filter(function(el) {\n applyViewboxTransform(el);\n return fabric.svgValidTagNamesRegEx.test(el.nodeName.replace('svg:', '')) &&\n !hasAncestorWithNodeName(el, fabric.svgInvalidAncestorsRegEx); // http://www.w3.org/TR/SVG/struct.html#DefsElement\n });\n if (!elements || (elements && !elements.length)) {\n callback && callback([], {});\n return;\n }\n var clipPaths = { };\n descendants.filter(function(el) {\n return el.nodeName.replace('svg:', '') === 'clipPath';\n }).forEach(function(el) {\n var id = el.getAttribute('id');\n clipPaths[id] = fabric.util.toArray(el.getElementsByTagName('*')).filter(function(el) {\n return fabric.svgValidTagNamesRegEx.test(el.nodeName.replace('svg:', ''));\n });\n });\n fabric.gradientDefs[svgUid] = fabric.getGradientDefs(doc);\n fabric.cssRules[svgUid] = fabric.getCSSRules(doc);\n fabric.clipPaths[svgUid] = clipPaths;\n // Precedence of rules: style > class > attribute\n fabric.parseElements(elements, function(instances, elements) {\n if (callback) {\n callback(instances, options, elements, descendants);\n delete fabric.gradientDefs[svgUid];\n delete fabric.cssRules[svgUid];\n delete fabric.clipPaths[svgUid];\n }\n }, clone(options), reviver, parsingOptions);\n };\n\n function recursivelyParseGradientsXlink(doc, gradient) {\n var gradientsAttrs = ['gradientTransform', 'x1', 'x2', 'y1', 'y2', 'gradientUnits', 'cx', 'cy', 'r', 'fx', 'fy'],\n xlinkAttr = 'xlink:href',\n xLink = gradient.getAttribute(xlinkAttr).substr(1),\n referencedGradient = elementById(doc, xLink);\n if (referencedGradient && referencedGradient.getAttribute(xlinkAttr)) {\n recursivelyParseGradientsXlink(doc, referencedGradient);\n }\n gradientsAttrs.forEach(function(attr) {\n if (referencedGradient && !gradient.hasAttribute(attr) && referencedGradient.hasAttribute(attr)) {\n gradient.setAttribute(attr, referencedGradient.getAttribute(attr));\n }\n });\n if (!gradient.children.length) {\n var referenceClone = referencedGradient.cloneNode(true);\n while (referenceClone.firstChild) {\n gradient.appendChild(referenceClone.firstChild);\n }\n }\n gradient.removeAttribute(xlinkAttr);\n }\n\n var reFontDeclaration = new RegExp(\n '(normal|italic)?\\\\s*(normal|small-caps)?\\\\s*' +\n '(normal|bold|bolder|lighter|100|200|300|400|500|600|700|800|900)?\\\\s*(' +\n fabric.reNum +\n '(?:px|cm|mm|em|pt|pc|in)*)(?:\\\\/(normal|' + fabric.reNum + '))?\\\\s+(.*)');\n\n extend(fabric, {\n /**\n * Parses a short font declaration, building adding its properties to a style object\n * @static\n * @function\n * @memberOf fabric\n * @param {String} value font declaration\n * @param {Object} oStyle definition\n */\n parseFontDeclaration: function(value, oStyle) {\n var match = value.match(reFontDeclaration);\n\n if (!match) {\n return;\n }\n var fontStyle = match[1],\n // font variant is not used\n // fontVariant = match[2],\n fontWeight = match[3],\n fontSize = match[4],\n lineHeight = match[5],\n fontFamily = match[6];\n\n if (fontStyle) {\n oStyle.fontStyle = fontStyle;\n }\n if (fontWeight) {\n oStyle.fontWeight = isNaN(parseFloat(fontWeight)) ? fontWeight : parseFloat(fontWeight);\n }\n if (fontSize) {\n oStyle.fontSize = parseUnit(fontSize);\n }\n if (fontFamily) {\n oStyle.fontFamily = fontFamily;\n }\n if (lineHeight) {\n oStyle.lineHeight = lineHeight === 'normal' ? 1 : lineHeight;\n }\n },\n\n /**\n * Parses an SVG document, returning all of the gradient declarations found in it\n * @static\n * @function\n * @memberOf fabric\n * @param {SVGDocument} doc SVG document to parse\n * @return {Object} Gradient definitions; key corresponds to element id, value -- to gradient definition element\n */\n getGradientDefs: function(doc) {\n var tagArray = [\n 'linearGradient',\n 'radialGradient',\n 'svg:linearGradient',\n 'svg:radialGradient'],\n elList = _getMultipleNodes(doc, tagArray),\n el, j = 0, gradientDefs = { };\n j = elList.length;\n while (j--) {\n el = elList[j];\n if (el.getAttribute('xlink:href')) {\n recursivelyParseGradientsXlink(doc, el);\n }\n gradientDefs[el.getAttribute('id')] = el;\n }\n return gradientDefs;\n },\n\n /**\n * Returns an object of attributes' name/value, given element and an array of attribute names;\n * Parses parent \"g\" nodes recursively upwards.\n * @static\n * @memberOf fabric\n * @param {DOMElement} element Element to parse\n * @param {Array} attributes Array of attributes to parse\n * @return {Object} object containing parsed attributes' names/values\n */\n parseAttributes: function(element, attributes, svgUid) {\n\n if (!element) {\n return;\n }\n\n var value,\n parentAttributes = { },\n fontSize, parentFontSize;\n\n if (typeof svgUid === 'undefined') {\n svgUid = element.getAttribute('svgUid');\n }\n // if there's a parent container (`g` or `a` or `symbol` node), parse its attributes recursively upwards\n if (element.parentNode && fabric.svgValidParentsRegEx.test(element.parentNode.nodeName)) {\n parentAttributes = fabric.parseAttributes(element.parentNode, attributes, svgUid);\n }\n\n var ownAttributes = attributes.reduce(function(memo, attr) {\n value = element.getAttribute(attr);\n if (value) { // eslint-disable-line\n memo[attr] = value;\n }\n return memo;\n }, { });\n // add values parsed from style, which take precedence over attributes\n // (see: http://www.w3.org/TR/SVG/styling.html#UsingPresentationAttributes)\n var cssAttrs = extend(\n getGlobalStylesForElement(element, svgUid),\n fabric.parseStyleAttribute(element)\n );\n ownAttributes = extend(\n ownAttributes,\n cssAttrs\n );\n if (cssAttrs[cPath]) {\n element.setAttribute(cPath, cssAttrs[cPath]);\n }\n fontSize = parentFontSize = parentAttributes.fontSize || fabric.Text.DEFAULT_SVG_FONT_SIZE;\n if (ownAttributes[fSize]) {\n // looks like the minimum should be 9px when dealing with ems. this is what looks like in browsers.\n ownAttributes[fSize] = fontSize = parseUnit(ownAttributes[fSize], parentFontSize);\n }\n\n var normalizedAttr, normalizedValue, normalizedStyle = {};\n for (var attr in ownAttributes) {\n normalizedAttr = normalizeAttr(attr);\n normalizedValue = normalizeValue(normalizedAttr, ownAttributes[attr], parentAttributes, fontSize);\n normalizedStyle[normalizedAttr] = normalizedValue;\n }\n if (normalizedStyle && normalizedStyle.font) {\n fabric.parseFontDeclaration(normalizedStyle.font, normalizedStyle);\n }\n var mergedAttrs = extend(parentAttributes, normalizedStyle);\n return fabric.svgValidParentsRegEx.test(element.nodeName) ? mergedAttrs : _setStrokeFillOpacity(mergedAttrs);\n },\n\n /**\n * Transforms an array of svg elements to corresponding fabric.* instances\n * @static\n * @memberOf fabric\n * @param {Array} elements Array of elements to parse\n * @param {Function} callback Being passed an array of fabric instances (transformed from SVG elements)\n * @param {Object} [options] Options object\n * @param {Function} [reviver] Method for further parsing of SVG elements, called after each fabric object created.\n */\n parseElements: function(elements, callback, options, reviver, parsingOptions) {\n new fabric.ElementsParser(elements, callback, options, reviver, parsingOptions).parse();\n },\n\n /**\n * Parses \"style\" attribute, retuning an object with values\n * @static\n * @memberOf fabric\n * @param {SVGElement} element Element to parse\n * @return {Object} Objects with values parsed from style attribute of an element\n */\n parseStyleAttribute: function(element) {\n var oStyle = { },\n style = element.getAttribute('style');\n\n if (!style) {\n return oStyle;\n }\n\n if (typeof style === 'string') {\n parseStyleString(style, oStyle);\n }\n else {\n parseStyleObject(style, oStyle);\n }\n\n return oStyle;\n },\n\n /**\n * Parses \"points\" attribute, returning an array of values\n * @static\n * @memberOf fabric\n * @param {String} points points attribute string\n * @return {Array} array of points\n */\n parsePointsAttribute: function(points) {\n\n // points attribute is required and must not be empty\n if (!points) {\n return null;\n }\n\n // replace commas with whitespace and remove bookending whitespace\n points = points.replace(/,/g, ' ').trim();\n\n points = points.split(/\\s+/);\n var parsedPoints = [], i, len;\n\n for (i = 0, len = points.length; i < len; i += 2) {\n parsedPoints.push({\n x: parseFloat(points[i]),\n y: parseFloat(points[i + 1])\n });\n }\n\n // odd number of points is an error\n // if (parsedPoints.length % 2 !== 0) {\n // return null;\n // }\n\n return parsedPoints;\n },\n\n /**\n * Returns CSS rules for a given SVG document\n * @static\n * @function\n * @memberOf fabric\n * @param {SVGDocument} doc SVG document to parse\n * @return {Object} CSS rules of this document\n */\n getCSSRules: function(doc) {\n var styles = doc.getElementsByTagName('style'), i, len,\n allRules = { }, rules;\n\n // very crude parsing of style contents\n for (i = 0, len = styles.length; i < len; i++) {\n // <style/> could produce `undefined`, covering this case with ''\n var styleContents = styles[i].textContent || '';\n\n // remove comments\n styleContents = styleContents.replace(/\\/\\*[\\s\\S]*?\\*\\//g, '');\n if (styleContents.trim() === '') {\n continue;\n }\n rules = styleContents.match(/[^{]*\\{[\\s\\S]*?\\}/g);\n rules = rules.map(function(rule) { return rule.trim(); });\n // eslint-disable-next-line no-loop-func\n rules.forEach(function(rule) {\n\n var match = rule.match(/([\\s\\S]*?)\\s*\\{([^}]*)\\}/),\n ruleObj = { }, declaration = match[2].trim(),\n propertyValuePairs = declaration.replace(/;$/, '').split(/\\s*;\\s*/);\n\n for (i = 0, len = propertyValuePairs.length; i < len; i++) {\n var pair = propertyValuePairs[i].split(/\\s*:\\s*/),\n property = pair[0],\n value = pair[1];\n ruleObj[property] = value;\n }\n rule = match[1];\n rule.split(',').forEach(function(_rule) {\n _rule = _rule.replace(/^svg/i, '').trim();\n if (_rule === '') {\n return;\n }\n if (allRules[_rule]) {\n fabric.util.object.extend(allRules[_rule], ruleObj);\n }\n else {\n allRules[_rule] = fabric.util.object.clone(ruleObj);\n }\n });\n });\n }\n return allRules;\n },\n\n /**\n * Takes url corresponding to an SVG document, and parses it into a set of fabric objects.\n * Note that SVG is fetched via XMLHttpRequest, so it needs to conform to SOP (Same Origin Policy)\n * @memberOf fabric\n * @param {String} url\n * @param {Function} callback\n * @param {Function} [reviver] Method for further parsing of SVG elements, called after each fabric object created.\n * @param {Object} [options] Object containing options for parsing\n * @param {String} [options.crossOrigin] crossOrigin crossOrigin setting to use for external resources\n */\n loadSVGFromURL: function(url, callback, reviver, options) {\n\n url = url.replace(/^\\n\\s*/, '').trim();\n new fabric.util.request(url, {\n method: 'get',\n onComplete: onComplete\n });\n\n function onComplete(r) {\n\n var xml = r.responseXML;\n if (!xml || !xml.documentElement) {\n callback && callback(null);\n return false;\n }\n\n fabric.parseSVGDocument(xml.documentElement, function (results, _options, elements, allElements) {\n callback && callback(results, _options, elements, allElements);\n }, reviver, options);\n }\n },\n\n /**\n * Takes string corresponding to an SVG document, and parses it into a set of fabric objects\n * @memberOf fabric\n * @param {String} string\n * @param {Function} callback\n * @param {Function} [reviver] Method for further parsing of SVG elements, called after each fabric object created.\n * @param {Object} [options] Object containing options for parsing\n * @param {String} [options.crossOrigin] crossOrigin crossOrigin setting to use for external resources\n */\n loadSVGFromString: function(string, callback, reviver, options) {\n var parser = new fabric.window.DOMParser(),\n doc = parser.parseFromString(string.trim(), 'text/xml');\n fabric.parseSVGDocument(doc.documentElement, function (results, _options, elements, allElements) {\n callback(results, _options, elements, allElements);\n }, reviver, options);\n }\n });\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\nfabric.ElementsParser = function(elements, callback, options, reviver, parsingOptions, doc) {\n this.elements = elements;\n this.callback = callback;\n this.options = options;\n this.reviver = reviver;\n this.svgUid = (options && options.svgUid) || 0;\n this.parsingOptions = parsingOptions;\n this.regexUrl = /^url\\(['\"]?#([^'\"]+)['\"]?\\)/g;\n this.doc = doc;\n};\n\n(function(proto) {\n proto.parse = function() {\n this.instances = new Array(this.elements.length);\n this.numElements = this.elements.length;\n this.createObjects();\n };\n\n proto.createObjects = function() {\n var _this = this;\n this.elements.forEach(function(element, i) {\n element.setAttribute('svgUid', _this.svgUid);\n _this.createObject(element, i);\n });\n };\n\n proto.findTag = function(el) {\n return fabric[fabric.util.string.capitalize(el.tagName.replace('svg:', ''))];\n };\n\n proto.createObject = function(el, index) {\n var klass = this.findTag(el);\n if (klass && klass.fromElement) {\n try {\n klass.fromElement(el, this.createCallback(index, el), this.options);\n }\n catch (err) {\n fabric.log(err);\n }\n }\n else {\n this.checkIfDone();\n }\n };\n\n proto.createCallback = function(index, el) {\n var _this = this;\n return function(obj) {\n var _options;\n _this.resolveGradient(obj, el, 'fill');\n _this.resolveGradient(obj, el, 'stroke');\n if (obj instanceof fabric.Image && obj._originalElement) {\n _options = obj.parsePreserveAspectRatioAttribute(el);\n }\n obj._removeTransformMatrix(_options);\n _this.resolveClipPath(obj, el);\n _this.reviver && _this.reviver(el, obj);\n _this.instances[index] = obj;\n _this.checkIfDone();\n };\n };\n\n proto.extractPropertyDefinition = function(obj, property, storage) {\n var value = obj[property], regex = this.regexUrl;\n if (!regex.test(value)) {\n return;\n }\n regex.lastIndex = 0;\n var id = regex.exec(value)[1];\n regex.lastIndex = 0;\n return fabric[storage][this.svgUid][id];\n };\n\n proto.resolveGradient = function(obj, el, property) {\n var gradientDef = this.extractPropertyDefinition(obj, property, 'gradientDefs');\n if (gradientDef) {\n var opacityAttr = el.getAttribute(property + '-opacity');\n var gradient = fabric.Gradient.fromElement(gradientDef, obj, opacityAttr, this.options);\n obj.set(property, gradient);\n }\n };\n\n proto.createClipPathCallback = function(obj, container) {\n return function(_newObj) {\n _newObj._removeTransformMatrix();\n _newObj.fillRule = _newObj.clipRule;\n container.push(_newObj);\n };\n };\n\n proto.resolveClipPath = function(obj, usingElement) {\n var clipPath = this.extractPropertyDefinition(obj, 'clipPath', 'clipPaths'),\n element, klass, objTransformInv, container, gTransform, options;\n if (clipPath) {\n container = [];\n objTransformInv = fabric.util.invertTransform(obj.calcTransformMatrix());\n // move the clipPath tag as sibling to the real element that is using it\n var clipPathTag = clipPath[0].parentNode;\n var clipPathOwner = usingElement;\n while (clipPathOwner.parentNode && clipPathOwner.getAttribute('clip-path') !== obj.clipPath) {\n clipPathOwner = clipPathOwner.parentNode;\n }\n clipPathOwner.parentNode.appendChild(clipPathTag);\n for (var i = 0; i < clipPath.length; i++) {\n element = clipPath[i];\n klass = this.findTag(element);\n klass.fromElement(\n element,\n this.createClipPathCallback(obj, container),\n this.options\n );\n }\n if (container.length === 1) {\n clipPath = container[0];\n }\n else {\n clipPath = new fabric.Group(container);\n }\n gTransform = fabric.util.multiplyTransformMatrices(\n objTransformInv,\n clipPath.calcTransformMatrix()\n );\n if (clipPath.clipPath) {\n this.resolveClipPath(clipPath, clipPathOwner);\n }\n var options = fabric.util.qrDecompose(gTransform);\n clipPath.flipX = false;\n clipPath.flipY = false;\n clipPath.set('scaleX', options.scaleX);\n clipPath.set('scaleY', options.scaleY);\n clipPath.angle = options.angle;\n clipPath.skewX = options.skewX;\n clipPath.skewY = 0;\n clipPath.setPositionByOrigin({ x: options.translateX, y: options.translateY }, 'center', 'center');\n obj.clipPath = clipPath;\n }\n else {\n // if clip-path does not resolve to any element, delete the property.\n delete obj.clipPath;\n }\n };\n\n proto.checkIfDone = function() {\n if (--this.numElements === 0) {\n this.instances = this.instances.filter(function(el) {\n // eslint-disable-next-line no-eq-null, eqeqeq\n return el != null;\n });\n this.callback(this.instances, this.elements);\n }\n };\n})(fabric.ElementsParser.prototype);\n\n\n(function(global) {\n\n 'use strict';\n\n /* Adaptation of work of Kevin Lindsey (kevin@kevlindev.com) */\n\n var fabric = global.fabric || (global.fabric = { });\n\n if (fabric.Point) {\n fabric.warn('fabric.Point is already defined');\n return;\n }\n\n fabric.Point = Point;\n\n /**\n * Point class\n * @class fabric.Point\n * @memberOf fabric\n * @constructor\n * @param {Number} x\n * @param {Number} y\n * @return {fabric.Point} thisArg\n */\n function Point(x, y) {\n this.x = x;\n this.y = y;\n }\n\n Point.prototype = /** @lends fabric.Point.prototype */ {\n\n type: 'point',\n\n constructor: Point,\n\n /**\n * Adds another point to this one and returns another one\n * @param {fabric.Point} that\n * @return {fabric.Point} new Point instance with added values\n */\n add: function (that) {\n return new Point(this.x + that.x, this.y + that.y);\n },\n\n /**\n * Adds another point to this one\n * @param {fabric.Point} that\n * @return {fabric.Point} thisArg\n * @chainable\n */\n addEquals: function (that) {\n this.x += that.x;\n this.y += that.y;\n return this;\n },\n\n /**\n * Adds value to this point and returns a new one\n * @param {Number} scalar\n * @return {fabric.Point} new Point with added value\n */\n scalarAdd: function (scalar) {\n return new Point(this.x + scalar, this.y + scalar);\n },\n\n /**\n * Adds value to this point\n * @param {Number} scalar\n * @return {fabric.Point} thisArg\n * @chainable\n */\n scalarAddEquals: function (scalar) {\n this.x += scalar;\n this.y += scalar;\n return this;\n },\n\n /**\n * Subtracts another point from this point and returns a new one\n * @param {fabric.Point} that\n * @return {fabric.Point} new Point object with subtracted values\n */\n subtract: function (that) {\n return new Point(this.x - that.x, this.y - that.y);\n },\n\n /**\n * Subtracts another point from this point\n * @param {fabric.Point} that\n * @return {fabric.Point} thisArg\n * @chainable\n */\n subtractEquals: function (that) {\n this.x -= that.x;\n this.y -= that.y;\n return this;\n },\n\n /**\n * Subtracts value from this point and returns a new one\n * @param {Number} scalar\n * @return {fabric.Point}\n */\n scalarSubtract: function (scalar) {\n return new Point(this.x - scalar, this.y - scalar);\n },\n\n /**\n * Subtracts value from this point\n * @param {Number} scalar\n * @return {fabric.Point} thisArg\n * @chainable\n */\n scalarSubtractEquals: function (scalar) {\n this.x -= scalar;\n this.y -= scalar;\n return this;\n },\n\n /**\n * Multiplies this point by a value and returns a new one\n * TODO: rename in scalarMultiply in 2.0\n * @param {Number} scalar\n * @return {fabric.Point}\n */\n multiply: function (scalar) {\n return new Point(this.x * scalar, this.y * scalar);\n },\n\n /**\n * Multiplies this point by a value\n * TODO: rename in scalarMultiplyEquals in 2.0\n * @param {Number} scalar\n * @return {fabric.Point} thisArg\n * @chainable\n */\n multiplyEquals: function (scalar) {\n this.x *= scalar;\n this.y *= scalar;\n return this;\n },\n\n /**\n * Divides this point by a value and returns a new one\n * TODO: rename in scalarDivide in 2.0\n * @param {Number} scalar\n * @return {fabric.Point}\n */\n divide: function (scalar) {\n return new Point(this.x / scalar, this.y / scalar);\n },\n\n /**\n * Divides this point by a value\n * TODO: rename in scalarDivideEquals in 2.0\n * @param {Number} scalar\n * @return {fabric.Point} thisArg\n * @chainable\n */\n divideEquals: function (scalar) {\n this.x /= scalar;\n this.y /= scalar;\n return this;\n },\n\n /**\n * Returns true if this point is equal to another one\n * @param {fabric.Point} that\n * @return {Boolean}\n */\n eq: function (that) {\n return (this.x === that.x && this.y === that.y);\n },\n\n /**\n * Returns true if this point is less than another one\n * @param {fabric.Point} that\n * @return {Boolean}\n */\n lt: function (that) {\n return (this.x < that.x && this.y < that.y);\n },\n\n /**\n * Returns true if this point is less than or equal to another one\n * @param {fabric.Point} that\n * @return {Boolean}\n */\n lte: function (that) {\n return (this.x <= that.x && this.y <= that.y);\n },\n\n /**\n\n * Returns true if this point is greater another one\n * @param {fabric.Point} that\n * @return {Boolean}\n */\n gt: function (that) {\n return (this.x > that.x && this.y > that.y);\n },\n\n /**\n * Returns true if this point is greater than or equal to another one\n * @param {fabric.Point} that\n * @return {Boolean}\n */\n gte: function (that) {\n return (this.x >= that.x && this.y >= that.y);\n },\n\n /**\n * Returns new point which is the result of linear interpolation with this one and another one\n * @param {fabric.Point} that\n * @param {Number} t , position of interpolation, between 0 and 1 default 0.5\n * @return {fabric.Point}\n */\n lerp: function (that, t) {\n if (typeof t === 'undefined') {\n t = 0.5;\n }\n t = Math.max(Math.min(1, t), 0);\n return new Point(this.x + (that.x - this.x) * t, this.y + (that.y - this.y) * t);\n },\n\n /**\n * Returns distance from this point and another one\n * @param {fabric.Point} that\n * @return {Number}\n */\n distanceFrom: function (that) {\n var dx = this.x - that.x,\n dy = this.y - that.y;\n return Math.sqrt(dx * dx + dy * dy);\n },\n\n /**\n * Returns the point between this point and another one\n * @param {fabric.Point} that\n * @return {fabric.Point}\n */\n midPointFrom: function (that) {\n return this.lerp(that);\n },\n\n /**\n * Returns a new point which is the min of this and another one\n * @param {fabric.Point} that\n * @return {fabric.Point}\n */\n min: function (that) {\n return new Point(Math.min(this.x, that.x), Math.min(this.y, that.y));\n },\n\n /**\n * Returns a new point which is the max of this and another one\n * @param {fabric.Point} that\n * @return {fabric.Point}\n */\n max: function (that) {\n return new Point(Math.max(this.x, that.x), Math.max(this.y, that.y));\n },\n\n /**\n * Returns string representation of this point\n * @return {String}\n */\n toString: function () {\n return this.x + ',' + this.y;\n },\n\n /**\n * Sets x/y of this point\n * @param {Number} x\n * @param {Number} y\n * @chainable\n */\n setXY: function (x, y) {\n this.x = x;\n this.y = y;\n return this;\n },\n\n /**\n * Sets x of this point\n * @param {Number} x\n * @chainable\n */\n setX: function (x) {\n this.x = x;\n return this;\n },\n\n /**\n * Sets y of this point\n * @param {Number} y\n * @chainable\n */\n setY: function (y) {\n this.y = y;\n return this;\n },\n\n /**\n * Sets x/y of this point from another point\n * @param {fabric.Point} that\n * @chainable\n */\n setFromPoint: function (that) {\n this.x = that.x;\n this.y = that.y;\n return this;\n },\n\n /**\n * Swaps x/y of this point and another point\n * @param {fabric.Point} that\n */\n swap: function (that) {\n var x = this.x,\n y = this.y;\n this.x = that.x;\n this.y = that.y;\n that.x = x;\n that.y = y;\n },\n\n /**\n * return a cloned instance of the point\n * @return {fabric.Point}\n */\n clone: function () {\n return new Point(this.x, this.y);\n }\n };\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n /* Adaptation of work of Kevin Lindsey (kevin@kevlindev.com) */\n var fabric = global.fabric || (global.fabric = { });\n\n if (fabric.Intersection) {\n fabric.warn('fabric.Intersection is already defined');\n return;\n }\n\n /**\n * Intersection class\n * @class fabric.Intersection\n * @memberOf fabric\n * @constructor\n */\n function Intersection(status) {\n this.status = status;\n this.points = [];\n }\n\n fabric.Intersection = Intersection;\n\n fabric.Intersection.prototype = /** @lends fabric.Intersection.prototype */ {\n\n constructor: Intersection,\n\n /**\n * Appends a point to intersection\n * @param {fabric.Point} point\n * @return {fabric.Intersection} thisArg\n * @chainable\n */\n appendPoint: function (point) {\n this.points.push(point);\n return this;\n },\n\n /**\n * Appends points to intersection\n * @param {Array} points\n * @return {fabric.Intersection} thisArg\n * @chainable\n */\n appendPoints: function (points) {\n this.points = this.points.concat(points);\n return this;\n }\n };\n\n /**\n * Checks if one line intersects another\n * TODO: rename in intersectSegmentSegment\n * @static\n * @param {fabric.Point} a1\n * @param {fabric.Point} a2\n * @param {fabric.Point} b1\n * @param {fabric.Point} b2\n * @return {fabric.Intersection}\n */\n fabric.Intersection.intersectLineLine = function (a1, a2, b1, b2) {\n var result,\n uaT = (b2.x - b1.x) * (a1.y - b1.y) - (b2.y - b1.y) * (a1.x - b1.x),\n ubT = (a2.x - a1.x) * (a1.y - b1.y) - (a2.y - a1.y) * (a1.x - b1.x),\n uB = (b2.y - b1.y) * (a2.x - a1.x) - (b2.x - b1.x) * (a2.y - a1.y);\n if (uB !== 0) {\n var ua = uaT / uB,\n ub = ubT / uB;\n if (0 <= ua && ua <= 1 && 0 <= ub && ub <= 1) {\n result = new Intersection('Intersection');\n result.appendPoint(new fabric.Point(a1.x + ua * (a2.x - a1.x), a1.y + ua * (a2.y - a1.y)));\n }\n else {\n result = new Intersection();\n }\n }\n else {\n if (uaT === 0 || ubT === 0) {\n result = new Intersection('Coincident');\n }\n else {\n result = new Intersection('Parallel');\n }\n }\n return result;\n };\n\n /**\n * Checks if line intersects polygon\n * TODO: rename in intersectSegmentPolygon\n * fix detection of coincident\n * @static\n * @param {fabric.Point} a1\n * @param {fabric.Point} a2\n * @param {Array} points\n * @return {fabric.Intersection}\n */\n fabric.Intersection.intersectLinePolygon = function(a1, a2, points) {\n var result = new Intersection(),\n length = points.length,\n b1, b2, inter, i;\n\n for (i = 0; i < length; i++) {\n b1 = points[i];\n b2 = points[(i + 1) % length];\n inter = Intersection.intersectLineLine(a1, a2, b1, b2);\n\n result.appendPoints(inter.points);\n }\n if (result.points.length > 0) {\n result.status = 'Intersection';\n }\n return result;\n };\n\n /**\n * Checks if polygon intersects another polygon\n * @static\n * @param {Array} points1\n * @param {Array} points2\n * @return {fabric.Intersection}\n */\n fabric.Intersection.intersectPolygonPolygon = function (points1, points2) {\n var result = new Intersection(),\n length = points1.length, i;\n\n for (i = 0; i < length; i++) {\n var a1 = points1[i],\n a2 = points1[(i + 1) % length],\n inter = Intersection.intersectLinePolygon(a1, a2, points2);\n\n result.appendPoints(inter.points);\n }\n if (result.points.length > 0) {\n result.status = 'Intersection';\n }\n return result;\n };\n\n /**\n * Checks if polygon intersects rectangle\n * @static\n * @param {Array} points\n * @param {fabric.Point} r1\n * @param {fabric.Point} r2\n * @return {fabric.Intersection}\n */\n fabric.Intersection.intersectPolygonRectangle = function (points, r1, r2) {\n var min = r1.min(r2),\n max = r1.max(r2),\n topRight = new fabric.Point(max.x, min.y),\n bottomLeft = new fabric.Point(min.x, max.y),\n inter1 = Intersection.intersectLinePolygon(min, topRight, points),\n inter2 = Intersection.intersectLinePolygon(topRight, max, points),\n inter3 = Intersection.intersectLinePolygon(max, bottomLeft, points),\n inter4 = Intersection.intersectLinePolygon(bottomLeft, min, points),\n result = new Intersection();\n\n result.appendPoints(inter1.points);\n result.appendPoints(inter2.points);\n result.appendPoints(inter3.points);\n result.appendPoints(inter4.points);\n\n if (result.points.length > 0) {\n result.status = 'Intersection';\n }\n return result;\n };\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { });\n\n if (fabric.Color) {\n fabric.warn('fabric.Color is already defined.');\n return;\n }\n\n /**\n * Color class\n * The purpose of {@link fabric.Color} is to abstract and encapsulate common color operations;\n * {@link fabric.Color} is a constructor and creates instances of {@link fabric.Color} objects.\n *\n * @class fabric.Color\n * @param {String} color optional in hex or rgb(a) or hsl format or from known color list\n * @return {fabric.Color} thisArg\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-2/#colors}\n */\n function Color(color) {\n if (!color) {\n this.setSource([0, 0, 0, 1]);\n }\n else {\n this._tryParsingColor(color);\n }\n }\n\n fabric.Color = Color;\n\n fabric.Color.prototype = /** @lends fabric.Color.prototype */ {\n\n /**\n * @private\n * @param {String|Array} color Color value to parse\n */\n _tryParsingColor: function(color) {\n var source;\n\n if (color in Color.colorNameMap) {\n color = Color.colorNameMap[color];\n }\n\n if (color === 'transparent') {\n source = [255, 255, 255, 0];\n }\n\n if (!source) {\n source = Color.sourceFromHex(color);\n }\n if (!source) {\n source = Color.sourceFromRgb(color);\n }\n if (!source) {\n source = Color.sourceFromHsl(color);\n }\n if (!source) {\n //if color is not recognize let's make black as canvas does\n source = [0, 0, 0, 1];\n }\n if (source) {\n this.setSource(source);\n }\n },\n\n /**\n * Adapted from <a href=\"https://rawgithub.com/mjijackson/mjijackson.github.com/master/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript.html\">https://github.com/mjijackson</a>\n * @private\n * @param {Number} r Red color value\n * @param {Number} g Green color value\n * @param {Number} b Blue color value\n * @return {Array} Hsl color\n */\n _rgbToHsl: function(r, g, b) {\n r /= 255; g /= 255; b /= 255;\n\n var h, s, l,\n max = fabric.util.array.max([r, g, b]),\n min = fabric.util.array.min([r, g, b]);\n\n l = (max + min) / 2;\n\n if (max === min) {\n h = s = 0; // achromatic\n }\n else {\n var d = max - min;\n s = l > 0.5 ? d / (2 - max - min) : d / (max + min);\n switch (max) {\n case r:\n h = (g - b) / d + (g < b ? 6 : 0);\n break;\n case g:\n h = (b - r) / d + 2;\n break;\n case b:\n h = (r - g) / d + 4;\n break;\n }\n h /= 6;\n }\n\n return [\n Math.round(h * 360),\n Math.round(s * 100),\n Math.round(l * 100)\n ];\n },\n\n /**\n * Returns source of this color (where source is an array representation; ex: [200, 200, 100, 1])\n * @return {Array}\n */\n getSource: function() {\n return this._source;\n },\n\n /**\n * Sets source of this color (where source is an array representation; ex: [200, 200, 100, 1])\n * @param {Array} source\n */\n setSource: function(source) {\n this._source = source;\n },\n\n /**\n * Returns color representation in RGB format\n * @return {String} ex: rgb(0-255,0-255,0-255)\n */\n toRgb: function() {\n var source = this.getSource();\n return 'rgb(' + source[0] + ',' + source[1] + ',' + source[2] + ')';\n },\n\n /**\n * Returns color representation in RGBA format\n * @return {String} ex: rgba(0-255,0-255,0-255,0-1)\n */\n toRgba: function() {\n var source = this.getSource();\n return 'rgba(' + source[0] + ',' + source[1] + ',' + source[2] + ',' + source[3] + ')';\n },\n\n /**\n * Returns color representation in HSL format\n * @return {String} ex: hsl(0-360,0%-100%,0%-100%)\n */\n toHsl: function() {\n var source = this.getSource(),\n hsl = this._rgbToHsl(source[0], source[1], source[2]);\n\n return 'hsl(' + hsl[0] + ',' + hsl[1] + '%,' + hsl[2] + '%)';\n },\n\n /**\n * Returns color representation in HSLA format\n * @return {String} ex: hsla(0-360,0%-100%,0%-100%,0-1)\n */\n toHsla: function() {\n var source = this.getSource(),\n hsl = this._rgbToHsl(source[0], source[1], source[2]);\n\n return 'hsla(' + hsl[0] + ',' + hsl[1] + '%,' + hsl[2] + '%,' + source[3] + ')';\n },\n\n /**\n * Returns color representation in HEX format\n * @return {String} ex: FF5555\n */\n toHex: function() {\n var source = this.getSource(), r, g, b;\n\n r = source[0].toString(16);\n r = (r.length === 1) ? ('0' + r) : r;\n\n g = source[1].toString(16);\n g = (g.length === 1) ? ('0' + g) : g;\n\n b = source[2].toString(16);\n b = (b.length === 1) ? ('0' + b) : b;\n\n return r.toUpperCase() + g.toUpperCase() + b.toUpperCase();\n },\n\n /**\n * Returns color representation in HEXA format\n * @return {String} ex: FF5555CC\n */\n toHexa: function() {\n var source = this.getSource(), a;\n\n a = Math.round(source[3] * 255);\n a = a.toString(16);\n a = (a.length === 1) ? ('0' + a) : a;\n\n return this.toHex() + a.toUpperCase();\n },\n\n /**\n * Gets value of alpha channel for this color\n * @return {Number} 0-1\n */\n getAlpha: function() {\n return this.getSource()[3];\n },\n\n /**\n * Sets value of alpha channel for this color\n * @param {Number} alpha Alpha value 0-1\n * @return {fabric.Color} thisArg\n */\n setAlpha: function(alpha) {\n var source = this.getSource();\n source[3] = alpha;\n this.setSource(source);\n return this;\n },\n\n /**\n * Transforms color to its grayscale representation\n * @return {fabric.Color} thisArg\n */\n toGrayscale: function() {\n var source = this.getSource(),\n average = parseInt((source[0] * 0.3 + source[1] * 0.59 + source[2] * 0.11).toFixed(0), 10),\n currentAlpha = source[3];\n this.setSource([average, average, average, currentAlpha]);\n return this;\n },\n\n /**\n * Transforms color to its black and white representation\n * @param {Number} threshold\n * @return {fabric.Color} thisArg\n */\n toBlackWhite: function(threshold) {\n var source = this.getSource(),\n average = (source[0] * 0.3 + source[1] * 0.59 + source[2] * 0.11).toFixed(0),\n currentAlpha = source[3];\n\n threshold = threshold || 127;\n\n average = (Number(average) < Number(threshold)) ? 0 : 255;\n this.setSource([average, average, average, currentAlpha]);\n return this;\n },\n\n /**\n * Overlays color with another color\n * @param {String|fabric.Color} otherColor\n * @return {fabric.Color} thisArg\n */\n overlayWith: function(otherColor) {\n if (!(otherColor instanceof Color)) {\n otherColor = new Color(otherColor);\n }\n\n var result = [],\n alpha = this.getAlpha(),\n otherAlpha = 0.5,\n source = this.getSource(),\n otherSource = otherColor.getSource(), i;\n\n for (i = 0; i < 3; i++) {\n result.push(Math.round((source[i] * (1 - otherAlpha)) + (otherSource[i] * otherAlpha)));\n }\n\n result[3] = alpha;\n this.setSource(result);\n return this;\n }\n };\n\n /**\n * Regex matching color in RGB or RGBA formats (ex: rgb(0, 0, 0), rgba(255, 100, 10, 0.5), rgba( 255 , 100 , 10 , 0.5 ), rgb(1,1,1), rgba(100%, 60%, 10%, 0.5))\n * @static\n * @field\n * @memberOf fabric.Color\n */\n // eslint-disable-next-line max-len\n fabric.Color.reRGBa = /^rgba?\\(\\s*(\\d{1,3}(?:\\.\\d+)?\\%?)\\s*,\\s*(\\d{1,3}(?:\\.\\d+)?\\%?)\\s*,\\s*(\\d{1,3}(?:\\.\\d+)?\\%?)\\s*(?:\\s*,\\s*((?:\\d*\\.?\\d+)?)\\s*)?\\)$/i;\n\n /**\n * Regex matching color in HSL or HSLA formats (ex: hsl(200, 80%, 10%), hsla(300, 50%, 80%, 0.5), hsla( 300 , 50% , 80% , 0.5 ))\n * @static\n * @field\n * @memberOf fabric.Color\n */\n fabric.Color.reHSLa = /^hsla?\\(\\s*(\\d{1,3})\\s*,\\s*(\\d{1,3}\\%)\\s*,\\s*(\\d{1,3}\\%)\\s*(?:\\s*,\\s*(\\d+(?:\\.\\d+)?)\\s*)?\\)$/i;\n\n /**\n * Regex matching color in HEX format (ex: #FF5544CC, #FF5555, 010155, aff)\n * @static\n * @field\n * @memberOf fabric.Color\n */\n fabric.Color.reHex = /^#?([0-9a-f]{8}|[0-9a-f]{6}|[0-9a-f]{4}|[0-9a-f]{3})$/i;\n\n /**\n * Map of the 148 color names with HEX code\n * @static\n * @field\n * @memberOf fabric.Color\n * @see: https://www.w3.org/TR/css3-color/#svg-color\n */\n fabric.Color.colorNameMap = {\n aliceblue: '#F0F8FF',\n antiquewhite: '#FAEBD7',\n aqua: '#00FFFF',\n aquamarine: '#7FFFD4',\n azure: '#F0FFFF',\n beige: '#F5F5DC',\n bisque: '#FFE4C4',\n black: '#000000',\n blanchedalmond: '#FFEBCD',\n blue: '#0000FF',\n blueviolet: '#8A2BE2',\n brown: '#A52A2A',\n burlywood: '#DEB887',\n cadetblue: '#5F9EA0',\n chartreuse: '#7FFF00',\n chocolate: '#D2691E',\n coral: '#FF7F50',\n cornflowerblue: '#6495ED',\n cornsilk: '#FFF8DC',\n crimson: '#DC143C',\n cyan: '#00FFFF',\n darkblue: '#00008B',\n darkcyan: '#008B8B',\n darkgoldenrod: '#B8860B',\n darkgray: '#A9A9A9',\n darkgrey: '#A9A9A9',\n darkgreen: '#006400',\n darkkhaki: '#BDB76B',\n darkmagenta: '#8B008B',\n darkolivegreen: '#556B2F',\n darkorange: '#FF8C00',\n darkorchid: '#9932CC',\n darkred: '#8B0000',\n darksalmon: '#E9967A',\n darkseagreen: '#8FBC8F',\n darkslateblue: '#483D8B',\n darkslategray: '#2F4F4F',\n darkslategrey: '#2F4F4F',\n darkturquoise: '#00CED1',\n darkviolet: '#9400D3',\n deeppink: '#FF1493',\n deepskyblue: '#00BFFF',\n dimgray: '#696969',\n dimgrey: '#696969',\n dodgerblue: '#1E90FF',\n firebrick: '#B22222',\n floralwhite: '#FFFAF0',\n forestgreen: '#228B22',\n fuchsia: '#FF00FF',\n gainsboro: '#DCDCDC',\n ghostwhite: '#F8F8FF',\n gold: '#FFD700',\n goldenrod: '#DAA520',\n gray: '#808080',\n grey: '#808080',\n green: '#008000',\n greenyellow: '#ADFF2F',\n honeydew: '#F0FFF0',\n hotpink: '#FF69B4',\n indianred: '#CD5C5C',\n indigo: '#4B0082',\n ivory: '#FFFFF0',\n khaki: '#F0E68C',\n lavender: '#E6E6FA',\n lavenderblush: '#FFF0F5',\n lawngreen: '#7CFC00',\n lemonchiffon: '#FFFACD',\n lightblue: '#ADD8E6',\n lightcoral: '#F08080',\n lightcyan: '#E0FFFF',\n lightgoldenrodyellow: '#FAFAD2',\n lightgray: '#D3D3D3',\n lightgrey: '#D3D3D3',\n lightgreen: '#90EE90',\n lightpink: '#FFB6C1',\n lightsalmon: '#FFA07A',\n lightseagreen: '#20B2AA',\n lightskyblue: '#87CEFA',\n lightslategray: '#778899',\n lightslategrey: '#778899',\n lightsteelblue: '#B0C4DE',\n lightyellow: '#FFFFE0',\n lime: '#00FF00',\n limegreen: '#32CD32',\n linen: '#FAF0E6',\n magenta: '#FF00FF',\n maroon: '#800000',\n mediumaquamarine: '#66CDAA',\n mediumblue: '#0000CD',\n mediumorchid: '#BA55D3',\n mediumpurple: '#9370DB',\n mediumseagreen: '#3CB371',\n mediumslateblue: '#7B68EE',\n mediumspringgreen: '#00FA9A',\n mediumturquoise: '#48D1CC',\n mediumvioletred: '#C71585',\n midnightblue: '#191970',\n mintcream: '#F5FFFA',\n mistyrose: '#FFE4E1',\n moccasin: '#FFE4B5',\n navajowhite: '#FFDEAD',\n navy: '#000080',\n oldlace: '#FDF5E6',\n olive: '#808000',\n olivedrab: '#6B8E23',\n orange: '#FFA500',\n orangered: '#FF4500',\n orchid: '#DA70D6',\n palegoldenrod: '#EEE8AA',\n palegreen: '#98FB98',\n paleturquoise: '#AFEEEE',\n palevioletred: '#DB7093',\n papayawhip: '#FFEFD5',\n peachpuff: '#FFDAB9',\n peru: '#CD853F',\n pink: '#FFC0CB',\n plum: '#DDA0DD',\n powderblue: '#B0E0E6',\n purple: '#800080',\n rebeccapurple: '#663399',\n red: '#FF0000',\n rosybrown: '#BC8F8F',\n royalblue: '#4169E1',\n saddlebrown: '#8B4513',\n salmon: '#FA8072',\n sandybrown: '#F4A460',\n seagreen: '#2E8B57',\n seashell: '#FFF5EE',\n sienna: '#A0522D',\n silver: '#C0C0C0',\n skyblue: '#87CEEB',\n slateblue: '#6A5ACD',\n slategray: '#708090',\n slategrey: '#708090',\n snow: '#FFFAFA',\n springgreen: '#00FF7F',\n steelblue: '#4682B4',\n tan: '#D2B48C',\n teal: '#008080',\n thistle: '#D8BFD8',\n tomato: '#FF6347',\n turquoise: '#40E0D0',\n violet: '#EE82EE',\n wheat: '#F5DEB3',\n white: '#FFFFFF',\n whitesmoke: '#F5F5F5',\n yellow: '#FFFF00',\n yellowgreen: '#9ACD32'\n };\n\n /**\n * @private\n * @param {Number} p\n * @param {Number} q\n * @param {Number} t\n * @return {Number}\n */\n function hue2rgb(p, q, t) {\n if (t < 0) {\n t += 1;\n }\n if (t > 1) {\n t -= 1;\n }\n if (t < 1 / 6) {\n return p + (q - p) * 6 * t;\n }\n if (t < 1 / 2) {\n return q;\n }\n if (t < 2 / 3) {\n return p + (q - p) * (2 / 3 - t) * 6;\n }\n return p;\n }\n\n /**\n * Returns new color object, when given a color in RGB format\n * @memberOf fabric.Color\n * @param {String} color Color value ex: rgb(0-255,0-255,0-255)\n * @return {fabric.Color}\n */\n fabric.Color.fromRgb = function(color) {\n return Color.fromSource(Color.sourceFromRgb(color));\n };\n\n /**\n * Returns array representation (ex: [100, 100, 200, 1]) of a color that's in RGB or RGBA format\n * @memberOf fabric.Color\n * @param {String} color Color value ex: rgb(0-255,0-255,0-255), rgb(0%-100%,0%-100%,0%-100%)\n * @return {Array} source\n */\n fabric.Color.sourceFromRgb = function(color) {\n var match = color.match(Color.reRGBa);\n if (match) {\n var r = parseInt(match[1], 10) / (/%$/.test(match[1]) ? 100 : 1) * (/%$/.test(match[1]) ? 255 : 1),\n g = parseInt(match[2], 10) / (/%$/.test(match[2]) ? 100 : 1) * (/%$/.test(match[2]) ? 255 : 1),\n b = parseInt(match[3], 10) / (/%$/.test(match[3]) ? 100 : 1) * (/%$/.test(match[3]) ? 255 : 1);\n\n return [\n parseInt(r, 10),\n parseInt(g, 10),\n parseInt(b, 10),\n match[4] ? parseFloat(match[4]) : 1\n ];\n }\n };\n\n /**\n * Returns new color object, when given a color in RGBA format\n * @static\n * @function\n * @memberOf fabric.Color\n * @param {String} color\n * @return {fabric.Color}\n */\n fabric.Color.fromRgba = Color.fromRgb;\n\n /**\n * Returns new color object, when given a color in HSL format\n * @param {String} color Color value ex: hsl(0-260,0%-100%,0%-100%)\n * @memberOf fabric.Color\n * @return {fabric.Color}\n */\n fabric.Color.fromHsl = function(color) {\n return Color.fromSource(Color.sourceFromHsl(color));\n };\n\n /**\n * Returns array representation (ex: [100, 100, 200, 1]) of a color that's in HSL or HSLA format.\n * Adapted from <a href=\"https://rawgithub.com/mjijackson/mjijackson.github.com/master/2008/02/rgb-to-hsl-and-rgb-to-hsv-color-model-conversion-algorithms-in-javascript.html\">https://github.com/mjijackson</a>\n * @memberOf fabric.Color\n * @param {String} color Color value ex: hsl(0-360,0%-100%,0%-100%) or hsla(0-360,0%-100%,0%-100%, 0-1)\n * @return {Array} source\n * @see http://http://www.w3.org/TR/css3-color/#hsl-color\n */\n fabric.Color.sourceFromHsl = function(color) {\n var match = color.match(Color.reHSLa);\n if (!match) {\n return;\n }\n\n var h = (((parseFloat(match[1]) % 360) + 360) % 360) / 360,\n s = parseFloat(match[2]) / (/%$/.test(match[2]) ? 100 : 1),\n l = parseFloat(match[3]) / (/%$/.test(match[3]) ? 100 : 1),\n r, g, b;\n\n if (s === 0) {\n r = g = b = l;\n }\n else {\n var q = l <= 0.5 ? l * (s + 1) : l + s - l * s,\n p = l * 2 - q;\n\n r = hue2rgb(p, q, h + 1 / 3);\n g = hue2rgb(p, q, h);\n b = hue2rgb(p, q, h - 1 / 3);\n }\n\n return [\n Math.round(r * 255),\n Math.round(g * 255),\n Math.round(b * 255),\n match[4] ? parseFloat(match[4]) : 1\n ];\n };\n\n /**\n * Returns new color object, when given a color in HSLA format\n * @static\n * @function\n * @memberOf fabric.Color\n * @param {String} color\n * @return {fabric.Color}\n */\n fabric.Color.fromHsla = Color.fromHsl;\n\n /**\n * Returns new color object, when given a color in HEX format\n * @static\n * @memberOf fabric.Color\n * @param {String} color Color value ex: FF5555\n * @return {fabric.Color}\n */\n fabric.Color.fromHex = function(color) {\n return Color.fromSource(Color.sourceFromHex(color));\n };\n\n /**\n * Returns array representation (ex: [100, 100, 200, 1]) of a color that's in HEX format\n * @static\n * @memberOf fabric.Color\n * @param {String} color ex: FF5555 or FF5544CC (RGBa)\n * @return {Array} source\n */\n fabric.Color.sourceFromHex = function(color) {\n if (color.match(Color.reHex)) {\n var value = color.slice(color.indexOf('#') + 1),\n isShortNotation = (value.length === 3 || value.length === 4),\n isRGBa = (value.length === 8 || value.length === 4),\n r = isShortNotation ? (value.charAt(0) + value.charAt(0)) : value.substring(0, 2),\n g = isShortNotation ? (value.charAt(1) + value.charAt(1)) : value.substring(2, 4),\n b = isShortNotation ? (value.charAt(2) + value.charAt(2)) : value.substring(4, 6),\n a = isRGBa ? (isShortNotation ? (value.charAt(3) + value.charAt(3)) : value.substring(6, 8)) : 'FF';\n\n return [\n parseInt(r, 16),\n parseInt(g, 16),\n parseInt(b, 16),\n parseFloat((parseInt(a, 16) / 255).toFixed(2))\n ];\n }\n };\n\n /**\n * Returns new color object, when given color in array representation (ex: [200, 100, 100, 0.5])\n * @static\n * @memberOf fabric.Color\n * @param {Array} source\n * @return {fabric.Color}\n */\n fabric.Color.fromSource = function(source) {\n var oColor = new Color();\n oColor.setSource(source);\n return oColor;\n };\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }),\n scaleMap = ['e', 'se', 's', 'sw', 'w', 'nw', 'n', 'ne', 'e'],\n skewMap = ['ns', 'nesw', 'ew', 'nwse'],\n controls = {},\n LEFT = 'left', TOP = 'top', RIGHT = 'right', BOTTOM = 'bottom', CENTER = 'center',\n opposite = {\n top: BOTTOM,\n bottom: TOP,\n left: RIGHT,\n right: LEFT,\n center: CENTER,\n }, radiansToDegrees = fabric.util.radiansToDegrees,\n sign = (Math.sign || function(x) { return ((x > 0) - (x < 0)) || +x; });\n\n /**\n * Combine control position and object angle to find the control direction compared\n * to the object center.\n * @param {fabric.Object} fabricObject the fabric object for which we are rendering controls\n * @param {fabric.Control} control the control class\n * @return {Number} 0 - 7 a quadrant number\n */\n function findCornerQuadrant(fabricObject, control) {\n var cornerAngle = fabricObject.angle + radiansToDegrees(Math.atan2(control.y, control.x)) + 360;\n return Math.round((cornerAngle % 360) / 45);\n }\n\n function fireEvent(eventName, options) {\n var target = options.transform.target,\n canvas = target.canvas,\n canvasOptions = fabric.util.object.clone(options);\n canvasOptions.target = target;\n canvas && canvas.fire('object:' + eventName, canvasOptions);\n target.fire(eventName, options);\n }\n\n /**\n * Inspect event and fabricObject properties to understand if the scaling action\n * @param {Event} eventData from the user action\n * @param {fabric.Object} fabricObject the fabric object about to scale\n * @return {Boolean} true if scale is proportional\n */\n function scaleIsProportional(eventData, fabricObject) {\n var canvas = fabricObject.canvas, uniScaleKey = canvas.uniScaleKey,\n uniformIsToggled = eventData[uniScaleKey];\n return (canvas.uniformScaling && !uniformIsToggled) ||\n (!canvas.uniformScaling && uniformIsToggled);\n }\n\n /**\n * Checks if transform is centered\n * @param {Object} transform transform data\n * @return {Boolean} true if transform is centered\n */\n function isTransformCentered(transform) {\n return transform.originX === CENTER && transform.originY === CENTER;\n }\n\n /**\n * Inspect fabricObject to understand if the current scaling action is allowed\n * @param {fabric.Object} fabricObject the fabric object about to scale\n * @param {String} by 'x' or 'y' or ''\n * @param {Boolean} scaleProportionally true if we are trying to scale proportionally\n * @return {Boolean} true if scaling is not allowed at current conditions\n */\n function scalingIsForbidden(fabricObject, by, scaleProportionally) {\n var lockX = fabricObject.lockScalingX, lockY = fabricObject.lockScalingY;\n if (lockX && lockY) {\n return true;\n }\n if (!by && (lockX || lockY) && scaleProportionally) {\n return true;\n }\n if (lockX && by === 'x') {\n return true;\n }\n if (lockY && by === 'y') {\n return true;\n }\n return false;\n }\n\n /**\n * return the correct cursor style for the scale action\n * @param {Event} eventData the javascript event that is causing the scale\n * @param {fabric.Control} control the control that is interested in the action\n * @param {fabric.Object} fabricObject the fabric object that is interested in the action\n * @return {String} a valid css string for the cursor\n */\n function scaleCursorStyleHandler(eventData, control, fabricObject) {\n var notAllowed = 'not-allowed',\n scaleProportionally = scaleIsProportional(eventData, fabricObject),\n by = '';\n if (control.x !== 0 && control.y === 0) {\n by = 'x';\n }\n else if (control.x === 0 && control.y !== 0) {\n by = 'y';\n }\n if (scalingIsForbidden(fabricObject, by, scaleProportionally)) {\n return notAllowed;\n }\n var n = findCornerQuadrant(fabricObject, control);\n return scaleMap[n] + '-resize';\n }\n\n /**\n * return the correct cursor style for the skew action\n * @param {Event} eventData the javascript event that is causing the scale\n * @param {fabric.Control} control the control that is interested in the action\n * @param {fabric.Object} fabricObject the fabric object that is interested in the action\n * @return {String} a valid css string for the cursor\n */\n function skewCursorStyleHandler(eventData, control, fabricObject) {\n var notAllowed = 'not-allowed';\n if (control.x !== 0 && fabricObject.lockSkewingY) {\n return notAllowed;\n }\n if (control.y !== 0 && fabricObject.lockSkewingX) {\n return notAllowed;\n }\n var n = findCornerQuadrant(fabricObject, control) % 4;\n return skewMap[n] + '-resize';\n }\n\n /**\n * Combine skew and scale style handlers to cover fabric standard use case\n * @param {Event} eventData the javascript event that is causing the scale\n * @param {fabric.Control} control the control that is interested in the action\n * @param {fabric.Object} fabricObject the fabric object that is interested in the action\n * @return {String} a valid css string for the cursor\n */\n function scaleSkewCursorStyleHandler(eventData, control, fabricObject) {\n if (eventData[fabricObject.canvas.altActionKey]) {\n return controls.skewCursorStyleHandler(eventData, control, fabricObject);\n }\n return controls.scaleCursorStyleHandler(eventData, control, fabricObject);\n }\n\n /**\n * Inspect event, control and fabricObject to return the correct action name\n * @param {Event} eventData the javascript event that is causing the scale\n * @param {fabric.Control} control the control that is interested in the action\n * @param {fabric.Object} fabricObject the fabric object that is interested in the action\n * @return {String} an action name\n */\n function scaleOrSkewActionName(eventData, control, fabricObject) {\n var isAlternative = eventData[fabricObject.canvas.altActionKey];\n if (control.x === 0) {\n // then is scaleY or skewX\n return isAlternative ? 'skewX' : 'scaleY';\n }\n if (control.y === 0) {\n // then is scaleY or skewX\n return isAlternative ? 'skewY' : 'scaleX';\n }\n }\n\n /**\n * Find the correct style for the control that is used for rotation.\n * this function is very simple and it just take care of not-allowed or standard cursor\n * @param {Event} eventData the javascript event that is causing the scale\n * @param {fabric.Control} control the control that is interested in the action\n * @param {fabric.Object} fabricObject the fabric object that is interested in the action\n * @return {String} a valid css string for the cursor\n */\n function rotationStyleHandler(eventData, control, fabricObject) {\n if (fabricObject.lockRotation) {\n return 'not-allowed';\n }\n return control.cursorStyle;\n }\n\n function commonEventInfo(eventData, transform, x, y) {\n return {\n e: eventData,\n transform: transform,\n pointer: {\n x: x,\n y: y,\n }\n };\n }\n\n /**\n * Wrap an action handler with saving/restoring object position on the transform.\n * this is the code that permits to objects to keep their position while transforming.\n * @param {Function} actionHandler the function to wrap\n * @return {Function} a function with an action handler signature\n */\n function wrapWithFixedAnchor(actionHandler) {\n return function(eventData, transform, x, y) {\n var target = transform.target, centerPoint = target.getCenterPoint(),\n constraint = target.translateToOriginPoint(centerPoint, transform.originX, transform.originY),\n actionPerformed = actionHandler(eventData, transform, x, y);\n target.setPositionByOrigin(constraint, transform.originX, transform.originY);\n return actionPerformed;\n };\n }\n\n /**\n * Transforms a point described by x and y in a distance from the top left corner of the object\n * bounding box.\n * @param {Object} transform\n * @param {String} originX\n * @param {String} originY\n * @param {number} x\n * @param {number} y\n * @return {Fabric.Point} the normalized point\n */\n function getLocalPoint(transform, originX, originY, x, y) {\n var target = transform.target,\n control = target.controls[transform.corner],\n zoom = target.canvas.getZoom(),\n padding = target.padding / zoom,\n localPoint = target.toLocalPoint(new fabric.Point(x, y), originX, originY);\n if (localPoint.x >= padding) {\n localPoint.x -= padding;\n }\n if (localPoint.x <= -padding) {\n localPoint.x += padding;\n }\n if (localPoint.y >= padding) {\n localPoint.y -= padding;\n }\n if (localPoint.y <= padding) {\n localPoint.y += padding;\n }\n localPoint.x -= control.offsetX;\n localPoint.y -= control.offsetY;\n return localPoint;\n }\n\n /**\n * Detect if the fabric object is flipped on one side.\n * @param {fabric.Object} target\n * @return {Boolean} true if one flip, but not two.\n */\n function targetHasOneFlip(target) {\n return (target.flipX && !target.flipY) || (!target.flipX && target.flipY);\n }\n\n /**\n * Utility function to compensate the scale factor when skew is applied on both axes\n * @private\n */\n function compensateScaleForSkew(target, oppositeSkew, scaleToCompensate, axis, reference) {\n if (target[oppositeSkew] !== 0) {\n var newDim = target._getTransformedDimensions()[axis];\n var newValue = reference / newDim * target[scaleToCompensate];\n target.set(scaleToCompensate, newValue);\n }\n }\n\n /**\n * Action handler for skewing on the X axis\n * @private\n */\n function skewObjectX(eventData, transform, x, y) {\n var target = transform.target,\n // find how big the object would be, if there was no skewX. takes in account scaling\n dimNoSkew = target._getTransformedDimensions(0, target.skewY),\n localPoint = getLocalPoint(transform, transform.originX, transform.originY, x, y),\n // the mouse is in the center of the object, and we want it to stay there.\n // so the object will grow twice as much as the mouse.\n // this makes the skew growth to localPoint * 2 - dimNoSkew.\n totalSkewSize = Math.abs(localPoint.x * 2) - dimNoSkew.x,\n currentSkew = target.skewX, newSkew;\n if (totalSkewSize < 2) {\n // let's make it easy to go back to position 0.\n newSkew = 0;\n }\n else {\n newSkew = radiansToDegrees(\n Math.atan2((totalSkewSize / target.scaleX), (dimNoSkew.y / target.scaleY))\n );\n // now we have to find the sign of the skew.\n // it mostly depend on the origin of transformation.\n if (transform.originX === LEFT && transform.originY === BOTTOM) {\n newSkew = -newSkew;\n }\n if (transform.originX === RIGHT && transform.originY === TOP) {\n newSkew = -newSkew;\n }\n if (targetHasOneFlip(target)) {\n newSkew = -newSkew;\n }\n }\n var hasSkewed = currentSkew !== newSkew;\n if (hasSkewed) {\n var dimBeforeSkewing = target._getTransformedDimensions().y;\n target.set('skewX', newSkew);\n compensateScaleForSkew(target, 'skewY', 'scaleY', 'y', dimBeforeSkewing);\n fireEvent('skewing', commonEventInfo(eventData, transform, x, y));\n }\n return hasSkewed;\n }\n\n /**\n * Action handler for skewing on the Y axis\n * @private\n */\n function skewObjectY(eventData, transform, x, y) {\n var target = transform.target,\n // find how big the object would be, if there was no skewX. takes in account scaling\n dimNoSkew = target._getTransformedDimensions(target.skewX, 0),\n localPoint = getLocalPoint(transform, transform.originX, transform.originY, x, y),\n // the mouse is in the center of the object, and we want it to stay there.\n // so the object will grow twice as much as the mouse.\n // this makes the skew growth to localPoint * 2 - dimNoSkew.\n totalSkewSize = Math.abs(localPoint.y * 2) - dimNoSkew.y,\n currentSkew = target.skewY, newSkew;\n if (totalSkewSize < 2) {\n // let's make it easy to go back to position 0.\n newSkew = 0;\n }\n else {\n newSkew = radiansToDegrees(\n Math.atan2((totalSkewSize / target.scaleY), (dimNoSkew.x / target.scaleX))\n );\n // now we have to find the sign of the skew.\n // it mostly depend on the origin of transformation.\n if (transform.originX === LEFT && transform.originY === BOTTOM) {\n newSkew = -newSkew;\n }\n if (transform.originX === RIGHT && transform.originY === TOP) {\n newSkew = -newSkew;\n }\n if (targetHasOneFlip(target)) {\n newSkew = -newSkew;\n }\n }\n var hasSkewed = currentSkew !== newSkew;\n if (hasSkewed) {\n var dimBeforeSkewing = target._getTransformedDimensions().x;\n target.set('skewY', newSkew);\n compensateScaleForSkew(target, 'skewX', 'scaleX', 'x', dimBeforeSkewing);\n fireEvent('skewing', commonEventInfo(eventData, transform, x, y));\n }\n return hasSkewed;\n }\n\n /**\n * Wrapped Action handler for skewing on the Y axis, takes care of the\n * skew direction and determine the correct transform origin for the anchor point\n * @param {Event} eventData javascript event that is doing the transform\n * @param {Object} transform javascript object containing a series of information around the current transform\n * @param {number} x current mouse x position, canvas normalized\n * @param {number} y current mouse y position, canvas normalized\n * @return {Boolean} true if some change happened\n */\n function skewHandlerX(eventData, transform, x, y) {\n // step1 figure out and change transform origin.\n // if skewX > 0 and originY bottom we anchor on right\n // if skewX > 0 and originY top we anchor on left\n // if skewX < 0 and originY bottom we anchor on left\n // if skewX < 0 and originY top we anchor on right\n // if skewX is 0, we look for mouse position to understand where are we going.\n var target = transform.target, currentSkew = target.skewX, originX, originY = transform.originY;\n if (target.lockSkewingX) {\n return false;\n }\n if (currentSkew === 0) {\n var localPointFromCenter = getLocalPoint(transform, CENTER, CENTER, x, y);\n if (localPointFromCenter.x > 0) {\n // we are pulling right, anchor left;\n originX = LEFT;\n }\n else {\n // we are pulling right, anchor right\n originX = RIGHT;\n }\n }\n else {\n if (currentSkew > 0) {\n originX = originY === TOP ? LEFT : RIGHT;\n }\n if (currentSkew < 0) {\n originX = originY === TOP ? RIGHT : LEFT;\n }\n // is the object flipped on one side only? swap the origin.\n if (targetHasOneFlip(target)) {\n originX = originX === LEFT ? RIGHT : LEFT;\n }\n }\n\n // once we have the origin, we find the anchor point\n transform.originX = originX;\n var finalHandler = wrapWithFixedAnchor(skewObjectX);\n return finalHandler(eventData, transform, x, y);\n }\n\n /**\n * Wrapped Action handler for skewing on the Y axis, takes care of the\n * skew direction and determine the correct transform origin for the anchor point\n * @param {Event} eventData javascript event that is doing the transform\n * @param {Object} transform javascript object containing a series of information around the current transform\n * @param {number} x current mouse x position, canvas normalized\n * @param {number} y current mouse y position, canvas normalized\n * @return {Boolean} true if some change happened\n */\n function skewHandlerY(eventData, transform, x, y) {\n // step1 figure out and change transform origin.\n // if skewY > 0 and originX left we anchor on top\n // if skewY > 0 and originX right we anchor on bottom\n // if skewY < 0 and originX left we anchor on bottom\n // if skewY < 0 and originX right we anchor on top\n // if skewY is 0, we look for mouse position to understand where are we going.\n var target = transform.target, currentSkew = target.skewY, originY, originX = transform.originX;\n if (target.lockSkewingY) {\n return false;\n }\n if (currentSkew === 0) {\n var localPointFromCenter = getLocalPoint(transform, CENTER, CENTER, x, y);\n if (localPointFromCenter.y > 0) {\n // we are pulling down, anchor up;\n originY = TOP;\n }\n else {\n // we are pulling up, anchor down\n originY = BOTTOM;\n }\n }\n else {\n if (currentSkew > 0) {\n originY = originX === LEFT ? TOP : BOTTOM;\n }\n if (currentSkew < 0) {\n originY = originX === LEFT ? BOTTOM : TOP;\n }\n // is the object flipped on one side only? swap the origin.\n if (targetHasOneFlip(target)) {\n originY = originY === TOP ? BOTTOM : TOP;\n }\n }\n\n // once we have the origin, we find the anchor point\n transform.originY = originY;\n var finalHandler = wrapWithFixedAnchor(skewObjectY);\n return finalHandler(eventData, transform, x, y);\n }\n\n /**\n * Action handler for rotation and snapping, without anchor point.\n * Needs to be wrapped with `wrapWithFixedAnchor` to be effective\n * @param {Event} eventData javascript event that is doing the transform\n * @param {Object} transform javascript object containing a series of information around the current transform\n * @param {number} x current mouse x position, canvas normalized\n * @param {number} y current mouse y position, canvas normalized\n * @return {Boolean} true if some change happened\n * @private\n */\n function rotationWithSnapping(eventData, transform, x, y) {\n var t = transform,\n target = t.target,\n pivotPoint = target.translateToOriginPoint(target.getCenterPoint(), t.originX, t.originY);\n\n if (target.lockRotation) {\n return false;\n }\n\n var lastAngle = Math.atan2(t.ey - pivotPoint.y, t.ex - pivotPoint.x),\n curAngle = Math.atan2(y - pivotPoint.y, x - pivotPoint.x),\n angle = radiansToDegrees(curAngle - lastAngle + t.theta),\n hasRotated = true;\n\n if (target.snapAngle > 0) {\n var snapAngle = target.snapAngle,\n snapThreshold = target.snapThreshold || snapAngle,\n rightAngleLocked = Math.ceil(angle / snapAngle) * snapAngle,\n leftAngleLocked = Math.floor(angle / snapAngle) * snapAngle;\n\n if (Math.abs(angle - leftAngleLocked) < snapThreshold) {\n angle = leftAngleLocked;\n }\n else if (Math.abs(angle - rightAngleLocked) < snapThreshold) {\n angle = rightAngleLocked;\n }\n }\n\n // normalize angle to positive value\n if (angle < 0) {\n angle = 360 + angle;\n }\n angle %= 360;\n\n hasRotated = target.angle !== angle;\n target.angle = angle;\n if (hasRotated) {\n fireEvent('rotating', commonEventInfo(eventData, transform, x, y));\n }\n return hasRotated;\n }\n\n /**\n * Basic scaling logic, reused with different constrain for scaling X,Y, freely or equally.\n * Needs to be wrapped with `wrapWithFixedAnchor` to be effective\n * @param {Event} eventData javascript event that is doing the transform\n * @param {Object} transform javascript object containing a series of information around the current transform\n * @param {number} x current mouse x position, canvas normalized\n * @param {number} y current mouse y position, canvas normalized\n * @param {Object} options additional information for scaling\n * @param {String} options.by 'x', 'y', 'equally' or '' to indicate type of scaling\n * @return {Boolean} true if some change happened\n * @private\n */\n function scaleObject(eventData, transform, x, y, options) {\n options = options || {};\n var target = transform.target,\n lockScalingX = target.lockScalingX, lockScalingY = target.lockScalingY,\n by = options.by, newPoint, scaleX, scaleY, dim,\n scaleProportionally = scaleIsProportional(eventData, target),\n forbidScaling = scalingIsForbidden(target, by, scaleProportionally),\n signX, signY, gestureScale = transform.gestureScale;\n\n if (forbidScaling) {\n return false;\n }\n if (gestureScale) {\n scaleX = transform.scaleX * gestureScale;\n scaleY = transform.scaleY * gestureScale;\n }\n else {\n newPoint = getLocalPoint(transform, transform.originX, transform.originY, x, y);\n // use of sign: We use sign to detect change of direction of an action. sign usually change when\n // we cross the origin point with the mouse. So a scale flip for example. There is an issue when scaling\n // by center and scaling using one middle control ( default: mr, mt, ml, mb), the mouse movement can easily\n // cross many time the origin point and flip the object. so we need a way to filter out the noise.\n // This ternary here should be ok to filter out X scaling when we want Y only and vice versa.\n signX = by !== 'y' ? sign(newPoint.x) : 1;\n signY = by !== 'x' ? sign(newPoint.y) : 1;\n if (!transform.signX) {\n transform.signX = signX;\n }\n if (!transform.signY) {\n transform.signY = signY;\n }\n\n if (target.lockScalingFlip &&\n (transform.signX !== signX || transform.signY !== signY)\n ) {\n return false;\n }\n\n dim = target._getTransformedDimensions();\n // missing detection of flip and logic to switch the origin\n if (scaleProportionally && !by) {\n // uniform scaling\n var distance = Math.abs(newPoint.x) + Math.abs(newPoint.y),\n original = transform.original,\n originalDistance = Math.abs(dim.x * original.scaleX / target.scaleX) +\n Math.abs(dim.y * original.scaleY / target.scaleY),\n scale = distance / originalDistance, hasScaled;\n scaleX = original.scaleX * scale;\n scaleY = original.scaleY * scale;\n }\n else {\n scaleX = Math.abs(newPoint.x * target.scaleX / dim.x);\n scaleY = Math.abs(newPoint.y * target.scaleY / dim.y);\n }\n // if we are scaling by center, we need to double the scale\n if (isTransformCentered(transform)) {\n scaleX *= 2;\n scaleY *= 2;\n }\n if (transform.signX !== signX && by !== 'y') {\n transform.originX = opposite[transform.originX];\n scaleX *= -1;\n transform.signX = signX;\n }\n if (transform.signY !== signY && by !== 'x') {\n transform.originY = opposite[transform.originY];\n scaleY *= -1;\n transform.signY = signY;\n }\n }\n // minScale is taken are in the setter.\n var oldScaleX = target.scaleX, oldScaleY = target.scaleY;\n if (!by) {\n !lockScalingX && target.set('scaleX', scaleX);\n !lockScalingY && target.set('scaleY', scaleY);\n }\n else {\n // forbidden cases already handled on top here.\n by === 'x' && target.set('scaleX', scaleX);\n by === 'y' && target.set('scaleY', scaleY);\n }\n hasScaled = oldScaleX !== target.scaleX || oldScaleY !== target.scaleY;\n if (hasScaled) {\n fireEvent('scaling', commonEventInfo(eventData, transform, x, y));\n }\n return hasScaled;\n }\n\n /**\n * Generic scaling logic, to scale from corners either equally or freely.\n * Needs to be wrapped with `wrapWithFixedAnchor` to be effective\n * @param {Event} eventData javascript event that is doing the transform\n * @param {Object} transform javascript object containing a series of information around the current transform\n * @param {number} x current mouse x position, canvas normalized\n * @param {number} y current mouse y position, canvas normalized\n * @return {Boolean} true if some change happened\n */\n function scaleObjectFromCorner(eventData, transform, x, y) {\n return scaleObject(eventData, transform, x, y);\n }\n\n /**\n * Scaling logic for the X axis.\n * Needs to be wrapped with `wrapWithFixedAnchor` to be effective\n * @param {Event} eventData javascript event that is doing the transform\n * @param {Object} transform javascript object containing a series of information around the current transform\n * @param {number} x current mouse x position, canvas normalized\n * @param {number} y current mouse y position, canvas normalized\n * @return {Boolean} true if some change happened\n */\n function scaleObjectX(eventData, transform, x, y) {\n return scaleObject(eventData, transform, x, y , { by: 'x' });\n }\n\n /**\n * Scaling logic for the Y axis.\n * Needs to be wrapped with `wrapWithFixedAnchor` to be effective\n * @param {Event} eventData javascript event that is doing the transform\n * @param {Object} transform javascript object containing a series of information around the current transform\n * @param {number} x current mouse x position, canvas normalized\n * @param {number} y current mouse y position, canvas normalized\n * @return {Boolean} true if some change happened\n */\n function scaleObjectY(eventData, transform, x, y) {\n return scaleObject(eventData, transform, x, y , { by: 'y' });\n }\n\n /**\n * Composed action handler to either scale Y or skew X\n * Needs to be wrapped with `wrapWithFixedAnchor` to be effective\n * @param {Event} eventData javascript event that is doing the transform\n * @param {Object} transform javascript object containing a series of information around the current transform\n * @param {number} x current mouse x position, canvas normalized\n * @param {number} y current mouse y position, canvas normalized\n * @return {Boolean} true if some change happened\n */\n function scalingYOrSkewingX(eventData, transform, x, y) {\n // ok some safety needed here.\n if (eventData[transform.target.canvas.altActionKey]) {\n return controls.skewHandlerX(eventData, transform, x, y);\n }\n return controls.scalingY(eventData, transform, x, y);\n }\n\n /**\n * Composed action handler to either scale X or skew Y\n * Needs to be wrapped with `wrapWithFixedAnchor` to be effective\n * @param {Event} eventData javascript event that is doing the transform\n * @param {Object} transform javascript object containing a series of information around the current transform\n * @param {number} x current mouse x position, canvas normalized\n * @param {number} y current mouse y position, canvas normalized\n * @return {Boolean} true if some change happened\n */\n function scalingXOrSkewingY(eventData, transform, x, y) {\n // ok some safety needed here.\n if (eventData[transform.target.canvas.altActionKey]) {\n return controls.skewHandlerY(eventData, transform, x, y);\n }\n return controls.scalingX(eventData, transform, x, y);\n }\n\n /**\n * Action handler to change textbox width\n * Needs to be wrapped with `wrapWithFixedAnchor` to be effective\n * @param {Event} eventData javascript event that is doing the transform\n * @param {Object} transform javascript object containing a series of information around the current transform\n * @param {number} x current mouse x position, canvas normalized\n * @param {number} y current mouse y position, canvas normalized\n * @return {Boolean} true if some change happened\n */\n function changeWidth(eventData, transform, x, y) {\n var target = transform.target, localPoint = getLocalPoint(transform, transform.originX, transform.originY, x, y),\n strokePadding = target.strokeWidth / (target.strokeUniform ? target.scaleX : 1),\n multiplier = isTransformCentered(transform) ? 2 : 1,\n oldWidth = target.width, hasResized,\n newWidth = Math.abs(localPoint.x * multiplier / target.scaleX) - strokePadding;\n target.set('width', Math.max(newWidth, 0));\n hasResized = oldWidth !== newWidth;\n if (hasResized) {\n fireEvent('resizing', commonEventInfo(eventData, transform, x, y));\n }\n return hasResized;\n }\n\n /**\n * Action handler\n * @private\n * @param {Event} eventData javascript event that is doing the transform\n * @param {Object} transform javascript object containing a series of information around the current transform\n * @param {number} x current mouse x position, canvas normalized\n * @param {number} y current mouse y position, canvas normalized\n * @return {Boolean} true if the translation occurred\n */\n function dragHandler(eventData, transform, x, y) {\n var target = transform.target,\n newLeft = x - transform.offsetX,\n newTop = y - transform.offsetY,\n moveX = !target.get('lockMovementX') && target.left !== newLeft,\n moveY = !target.get('lockMovementY') && target.top !== newTop;\n moveX && target.set('left', newLeft);\n moveY && target.set('top', newTop);\n if (moveX || moveY) {\n fireEvent('moving', commonEventInfo(eventData, transform, x, y));\n }\n return moveX || moveY;\n }\n\n controls.scaleCursorStyleHandler = scaleCursorStyleHandler;\n controls.skewCursorStyleHandler = skewCursorStyleHandler;\n controls.scaleSkewCursorStyleHandler = scaleSkewCursorStyleHandler;\n controls.rotationWithSnapping = wrapWithFixedAnchor(rotationWithSnapping);\n controls.scalingEqually = wrapWithFixedAnchor(scaleObjectFromCorner);\n controls.scalingX = wrapWithFixedAnchor(scaleObjectX);\n controls.scalingY = wrapWithFixedAnchor(scaleObjectY);\n controls.scalingYOrSkewingX = scalingYOrSkewingX;\n controls.scalingXOrSkewingY = scalingXOrSkewingY;\n controls.changeWidth = wrapWithFixedAnchor(changeWidth);\n controls.skewHandlerX = skewHandlerX;\n controls.skewHandlerY = skewHandlerY;\n controls.dragHandler = dragHandler;\n controls.scaleOrSkewActionName = scaleOrSkewActionName;\n controls.rotationStyleHandler = rotationStyleHandler;\n controls.fireEvent = fireEvent;\n controls.wrapWithFixedAnchor = wrapWithFixedAnchor;\n controls.getLocalPoint = getLocalPoint;\n fabric.controlsUtils = controls;\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }),\n degreesToRadians = fabric.util.degreesToRadians,\n controls = fabric.controlsUtils;\n\n /**\n * Render a round control, as per fabric features.\n * This function is written to respect object properties like transparentCorners, cornerSize\n * cornerColor, cornerStrokeColor\n * plus the addition of offsetY and offsetX.\n * @param {CanvasRenderingContext2D} ctx context to render on\n * @param {Number} left x coordinate where the control center should be\n * @param {Number} top y coordinate where the control center should be\n * @param {Object} styleOverride override for fabric.Object controls style\n * @param {fabric.Object} fabricObject the fabric object for which we are rendering controls\n */\n function renderCircleControl (ctx, left, top, styleOverride, fabricObject) {\n styleOverride = styleOverride || {};\n var size = styleOverride.cornerSize || fabricObject.cornerSize,\n transparentCorners = typeof styleOverride.transparentCorners !== 'undefined' ?\n styleOverride.transparentCorners : this.transparentCorners,\n methodName = transparentCorners ? 'stroke' : 'fill',\n stroke = !transparentCorners && (styleOverride.cornerStrokeColor || fabricObject.cornerStrokeColor);\n ctx.save();\n ctx.fillStyle = styleOverride.cornerColor || fabricObject.cornerColor;\n ctx.strokeStyle = styleOverride.cornerStrokeColor || fabricObject.cornerStrokeColor;\n // this is still wrong\n ctx.lineWidth = 1;\n ctx.beginPath();\n ctx.arc(left, top, size / 2, 0, 2 * Math.PI, false);\n ctx[methodName]();\n if (stroke) {\n ctx.stroke();\n }\n ctx.restore();\n }\n\n /**\n * Render a square control, as per fabric features.\n * This function is written to respect object properties like transparentCorners, cornerSize\n * cornerColor, cornerStrokeColor\n * plus the addition of offsetY and offsetX.\n * @param {CanvasRenderingContext2D} ctx context to render on\n * @param {Number} left x coordinate where the control center should be\n * @param {Number} top y coordinate where the control center should be\n * @param {Object} styleOverride override for fabric.Object controls style\n * @param {fabric.Object} fabricObject the fabric object for which we are rendering controls\n */\n function renderSquareControl(ctx, left, top, styleOverride, fabricObject) {\n styleOverride = styleOverride || {};\n var size = styleOverride.cornerSize || fabricObject.cornerSize,\n transparentCorners = typeof styleOverride.transparentCorners !== 'undefined' ?\n styleOverride.transparentCorners : fabricObject.transparentCorners,\n methodName = transparentCorners ? 'stroke' : 'fill',\n stroke = !transparentCorners && (\n styleOverride.cornerStrokeColor || fabricObject.cornerStrokeColor\n ), sizeBy2 = size / 2;\n ctx.save();\n ctx.fillStyle = styleOverride.cornerColor || fabricObject.cornerColor;\n ctx.strokeStyle = styleOverride.strokeCornerColor || fabricObject.strokeCornerColor;\n // this is still wrong\n ctx.lineWidth = 1;\n ctx.translate(left, top);\n ctx.rotate(degreesToRadians(fabricObject.angle));\n // this does not work, and fixed with ( && ) does not make sense.\n // to have real transparent corners we need the controls on upperCanvas\n // transparentCorners || ctx.clearRect(-sizeBy2, -sizeBy2, size, size);\n ctx[methodName + 'Rect'](-sizeBy2, -sizeBy2, size, size);\n if (stroke) {\n ctx.strokeRect(-sizeBy2, -sizeBy2, size, size);\n }\n ctx.restore();\n }\n\n controls.renderCircleControl = renderCircleControl;\n controls.renderSquareControl = renderSquareControl;\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { });\n\n function Control(options) {\n for (var i in options) {\n this[i] = options[i];\n }\n }\n\n fabric.Control = Control;\n\n fabric.Control.prototype = /** @lends fabric.Control.prototype */ {\n\n /**\n * keep track of control visibility.\n * mainly for backward compatibility.\n * if you do not want to see a control, you can remove it\n * from the controlset.\n * @type {Boolean}\n * @default true\n */\n visible: true,\n\n /**\n * Name of the action that the controll will likely execute.\n * This is optional. FabricJS uses to identify what the user is doing for some\n * extra optimizations. If you are writing a custom control and you want to know\n * somewhere else in the code what is going on, you can use this string here.\n * you can also provide a custom getActionName if your control run multiple actions\n * depending on some external state.\n * default to scale since is the most common, used on 4 corners by default\n * @type {String}\n * @default 'scale'\n */\n actionName: 'scale',\n\n /**\n * Drawing angle of the control.\n * NOT used for now, but name marked as needed for internal logic\n * example: to reuse the same drawing function for different rotated controls\n * @type {Number}\n * @default 0\n */\n angle: 0,\n\n /**\n * Relative position of the control. X\n * 0,0 is the center of the Object, while -0.5 (left) or 0.5 (right) are the extremities\n * of the bounding box.\n * @type {Number}\n * @default 0\n */\n x: 0,\n\n /**\n * Relative position of the control. Y\n * 0,0 is the center of the Object, while -0.5 (top) or 0.5 (bottom) are the extremities\n * of the bounding box.\n * @type {Number}\n * @default 0\n */\n y: 0,\n\n /**\n * Horizontal offset of the control from the defined position. In pixels\n * Positive offset moves the control to the right, negative to the left.\n * It used when you want to have position of control that does not scale with\n * the bounding box. Example: rotation control is placed at x:0, y: 0.5 on\n * the boundindbox, with an offset of 30 pixels vertivally. Those 30 pixels will\n * stay 30 pixels no matter how the object is big. Another example is having 2\n * controls in the corner, that stay in the same position when the object scale.\n * of the bounding box.\n * @type {Number}\n * @default 0\n */\n offsetX: 0,\n\n /**\n * Vertical offset of the control from the defined position. In pixels\n * Positive offset moves the control to the bottom, negative to the top.\n * @type {Number}\n * @default 0\n */\n offsetY: 0,\n\n /**\n * Css cursor style to display when the control is hovered.\n * if the method `cursorStyleHandler` is provided, this property is ignored.\n * @type {String}\n * @default 'crosshair'\n */\n cursorStyle: 'crosshair',\n\n /**\n * If controls has an offsetY or offsetX, draw a line that connects\n * the control to the bounding box\n * @type {Boolean}\n * @default false\n */\n withConnection: false,\n\n /**\n * The control actionHandler, provide one to handle action ( control being moved )\n * @param {Event} eventData the native mouse event\n * @param {Object} transformData properties of the current transform\n * @param {fabric.Object} object on which the control is displayed\n * @return {Function}\n */\n actionHandler: function(/* eventData, transformData, fabricObject */) { },\n\n /**\n * The control handler for mouse down, provide one to handle mouse down on control\n * @param {Event} eventData the native mouse event\n * @param {Object} transformData properties of the current transform\n * @param {fabric.Object} object on which the control is displayed\n * @return {Function}\n */\n mouseDownHandler: function(/* eventData, transformData, fabricObject */) { },\n\n /**\n * The control mouseUpHandler, provide one to handle an effect on mouse up.\n * @param {Event} eventData the native mouse event\n * @param {Object} transformData properties of the current transform\n * @param {fabric.Object} object on which the control is displayed\n * @return {Function}\n */\n mouseUpHandler: function(/* eventData, transformData, fabricObject */) { },\n\n /**\n * Returns control actionHandler\n * @param {Event} eventData the native mouse event\n * @param {Object} transformData properties of the current transform\n * @param {fabric.Object} object on which the control is displayed\n * @return {Function}\n */\n getActionHandler: function(/* eventData, transformData, fabricObject */) {\n return this.actionHandler;\n },\n\n /**\n * Returns control mouseDown handler\n * @param {Event} eventData the native mouse event\n * @param {Object} transformData properties of the current transform\n * @param {fabric.Object} object on which the control is displayed\n * @return {Function}\n */\n getMouseDownHandler: function(/* eventData, fabricObject, control */) {\n return this.mouseDownHandler;\n },\n\n /**\n * Returns control mouseUp handler\n * @param {Event} eventData the native mouse event\n * @param {Object} transformData properties of the current transform\n * @param {fabric.Object} object on which the control is displayed\n * @return {Function}\n */\n getMouseUpHandler: function(/* eventData, fabricObject, control */) {\n return this.mouseUpHandler;\n },\n\n /**\n * Returns control cursorStyle for css using cursorStyle. If you need a more elaborate\n * function you can pass one in the constructor\n * the cursorStyle property\n * @param {Event} eventData the native mouse event\n * @param {fabric.Control} control the current control ( likely this)\n * @param {fabric.Object} object on which the control is displayed\n * @return {String}\n */\n cursorStyleHandler: function(eventData, control /* fabricObject */) {\n return control.cursorStyle;\n },\n\n /**\n * Returns the action name. The basic implementation just return the actionName property.\n * @param {Event} eventData the native mouse event\n * @param {fabric.Control} control the current control ( likely this)\n * @param {fabric.Object} object on which the control is displayed\n * @return {String}\n */\n getActionName: function(eventData, control /* fabricObject */) {\n return control.actionName;\n },\n\n /**\n * Returns controls visibility\n * @param {fabric.Object} object on which the control is displayed\n * @param {String} controlKey key where the control is memorized on the\n * @return {Boolean}\n */\n getVisibility: function(fabricObject, controlKey) {\n var objectVisibility = fabricObject._controlsVisibility;\n if (objectVisibility && typeof objectVisibility[controlKey] !== 'undefined') {\n return objectVisibility[controlKey];\n }\n return this.visible;\n },\n\n /**\n * Sets controls visibility\n * @param {Boolean} visibility for the object\n * @return {Void}\n */\n setVisibility: function(visibility /* name, fabricObject */) {\n this.visible = visibility;\n },\n\n\n positionHandler: function(dim, finalMatrix /*, fabricObject, currentControl */) {\n var point = fabric.util.transformPoint({\n x: this.x * dim.x + this.offsetX,\n y: this.y * dim.y + this.offsetY }, finalMatrix);\n return point;\n },\n\n /**\n * Render function for the control.\n * When this function runs the context is unscaled. unrotate. Just retina scaled.\n * all the functions will have to translate to the point left,top before starting Drawing\n * if they want to draw a control where the position is detected.\n * left and top are the result of the positionHandler function\n * @param {RenderingContext2D} ctx the context where the control will be drawn\n * @param {Number} left position of the canvas where we are about to render the control.\n * @param {Number} top position of the canvas where we are about to render the control.\n * @param {Object} styleOverride\n * @param {fabric.Object} fabricObject the object where the control is about to be rendered\n */\n render: function(ctx, left, top, styleOverride, fabricObject) {\n styleOverride = styleOverride || {};\n switch (styleOverride.cornerStyle || fabricObject.cornerStyle) {\n case 'circle':\n fabric.controlsUtils.renderCircleControl.call(this, ctx, left, top, styleOverride, fabricObject);\n break;\n default:\n fabric.controlsUtils.renderSquareControl.call(this, ctx, left, top, styleOverride, fabricObject);\n }\n },\n };\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function() {\n\n /* _FROM_SVG_START_ */\n function getColorStop(el, multiplier) {\n var style = el.getAttribute('style'),\n offset = el.getAttribute('offset') || 0,\n color, colorAlpha, opacity, i;\n\n // convert percents to absolute values\n offset = parseFloat(offset) / (/%$/.test(offset) ? 100 : 1);\n offset = offset < 0 ? 0 : offset > 1 ? 1 : offset;\n if (style) {\n var keyValuePairs = style.split(/\\s*;\\s*/);\n\n if (keyValuePairs[keyValuePairs.length - 1] === '') {\n keyValuePairs.pop();\n }\n\n for (i = keyValuePairs.length; i--; ) {\n\n var split = keyValuePairs[i].split(/\\s*:\\s*/),\n key = split[0].trim(),\n value = split[1].trim();\n\n if (key === 'stop-color') {\n color = value;\n }\n else if (key === 'stop-opacity') {\n opacity = value;\n }\n }\n }\n\n if (!color) {\n color = el.getAttribute('stop-color') || 'rgb(0,0,0)';\n }\n if (!opacity) {\n opacity = el.getAttribute('stop-opacity');\n }\n\n color = new fabric.Color(color);\n colorAlpha = color.getAlpha();\n opacity = isNaN(parseFloat(opacity)) ? 1 : parseFloat(opacity);\n opacity *= colorAlpha * multiplier;\n\n return {\n offset: offset,\n color: color.toRgb(),\n opacity: opacity\n };\n }\n\n function getLinearCoords(el) {\n return {\n x1: el.getAttribute('x1') || 0,\n y1: el.getAttribute('y1') || 0,\n x2: el.getAttribute('x2') || '100%',\n y2: el.getAttribute('y2') || 0\n };\n }\n\n function getRadialCoords(el) {\n return {\n x1: el.getAttribute('fx') || el.getAttribute('cx') || '50%',\n y1: el.getAttribute('fy') || el.getAttribute('cy') || '50%',\n r1: 0,\n x2: el.getAttribute('cx') || '50%',\n y2: el.getAttribute('cy') || '50%',\n r2: el.getAttribute('r') || '50%'\n };\n }\n /* _FROM_SVG_END_ */\n\n var clone = fabric.util.object.clone;\n\n /**\n * Gradient class\n * @class fabric.Gradient\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-2#gradients}\n * @see {@link fabric.Gradient#initialize} for constructor definition\n */\n fabric.Gradient = fabric.util.createClass(/** @lends fabric.Gradient.prototype */ {\n\n /**\n * Horizontal offset for aligning gradients coming from SVG when outside pathgroups\n * @type Number\n * @default 0\n */\n offsetX: 0,\n\n /**\n * Vertical offset for aligning gradients coming from SVG when outside pathgroups\n * @type Number\n * @default 0\n */\n offsetY: 0,\n\n /**\n * A transform matrix to apply to the gradient before painting.\n * Imported from svg gradients, is not applied with the current transform in the center.\n * Before this transform is applied, the origin point is at the top left corner of the object\n * plus the addition of offsetY and offsetX.\n * @type Number[]\n * @default null\n */\n gradientTransform: null,\n\n /**\n * coordinates units for coords.\n * If `pixels`, the number of coords are in the same unit of width / height.\n * If set as `percentage` the coords are still a number, but 1 means 100% of width\n * for the X and 100% of the height for the y. It can be bigger than 1 and negative.\n * allowed values pixels or percentage.\n * @type String\n * @default 'pixels'\n */\n gradientUnits: 'pixels',\n\n /**\n * Gradient type linear or radial\n * @type String\n * @default 'pixels'\n */\n type: 'linear',\n\n /**\n * Constructor\n * @param {Object} options Options object with type, coords, gradientUnits and colorStops\n * @param {Object} [options.type] gradient type linear or radial\n * @param {Object} [options.gradientUnits] gradient units\n * @param {Object} [options.offsetX] SVG import compatibility\n * @param {Object} [options.offsetY] SVG import compatibility\n * @param {Object[]} options.colorStops contains the colorstops.\n * @param {Object} options.coords contains the coords of the gradient\n * @param {Number} [options.coords.x1] X coordiante of the first point for linear or of the focal point for radial\n * @param {Number} [options.coords.y1] Y coordiante of the first point for linear or of the focal point for radial\n * @param {Number} [options.coords.x2] X coordiante of the second point for linear or of the center point for radial\n * @param {Number} [options.coords.y2] Y coordiante of the second point for linear or of the center point for radial\n * @param {Number} [options.coords.r1] only for radial gradient, radius of the inner circle\n * @param {Number} [options.coords.r2] only for radial gradient, radius of the external circle\n * @return {fabric.Gradient} thisArg\n */\n initialize: function(options) {\n options || (options = { });\n options.coords || (options.coords = { });\n\n var coords, _this = this;\n\n // sets everything, then coords and colorstops get sets again\n Object.keys(options).forEach(function(option) {\n _this[option] = options[option];\n });\n\n if (this.id) {\n this.id += '_' + fabric.Object.__uid++;\n }\n else {\n this.id = fabric.Object.__uid++;\n }\n\n coords = {\n x1: options.coords.x1 || 0,\n y1: options.coords.y1 || 0,\n x2: options.coords.x2 || 0,\n y2: options.coords.y2 || 0\n };\n\n if (this.type === 'radial') {\n coords.r1 = options.coords.r1 || 0;\n coords.r2 = options.coords.r2 || 0;\n }\n\n this.coords = coords;\n this.colorStops = options.colorStops.slice();\n },\n\n /**\n * Adds another colorStop\n * @param {Object} colorStop Object with offset and color\n * @return {fabric.Gradient} thisArg\n */\n addColorStop: function(colorStops) {\n for (var position in colorStops) {\n var color = new fabric.Color(colorStops[position]);\n this.colorStops.push({\n offset: parseFloat(position),\n color: color.toRgb(),\n opacity: color.getAlpha()\n });\n }\n return this;\n },\n\n /**\n * Returns object representation of a gradient\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object}\n */\n toObject: function(propertiesToInclude) {\n var object = {\n type: this.type,\n coords: this.coords,\n colorStops: this.colorStops,\n offsetX: this.offsetX,\n offsetY: this.offsetY,\n gradientUnits: this.gradientUnits,\n gradientTransform: this.gradientTransform ? this.gradientTransform.concat() : this.gradientTransform\n };\n fabric.util.populateWithProperties(this, object, propertiesToInclude);\n\n return object;\n },\n\n /* _TO_SVG_START_ */\n /**\n * Returns SVG representation of an gradient\n * @param {Object} object Object to create a gradient for\n * @return {String} SVG representation of an gradient (linear/radial)\n */\n toSVG: function(object, options) {\n var coords = clone(this.coords, true), i, len, options = options || {},\n markup, commonAttributes, colorStops = clone(this.colorStops, true),\n needsSwap = coords.r1 > coords.r2,\n transform = this.gradientTransform ? this.gradientTransform.concat() : fabric.iMatrix.concat(),\n offsetX = -this.offsetX, offsetY = -this.offsetY,\n withViewport = !!options.additionalTransform,\n gradientUnits = this.gradientUnits === 'pixels' ? 'userSpaceOnUse' : 'objectBoundingBox';\n // colorStops must be sorted ascending\n colorStops.sort(function(a, b) {\n return a.offset - b.offset;\n });\n\n if (gradientUnits === 'objectBoundingBox') {\n offsetX /= object.width;\n offsetY /= object.height;\n }\n else {\n offsetX += object.width / 2;\n offsetY += object.height / 2;\n }\n if (object.type === 'path') {\n offsetX -= object.pathOffset.x;\n offsetY -= object.pathOffset.y;\n }\n\n\n transform[4] -= offsetX;\n transform[5] -= offsetY;\n\n commonAttributes = 'id=\"SVGID_' + this.id +\n '\" gradientUnits=\"' + gradientUnits + '\"';\n commonAttributes += ' gradientTransform=\"' + (withViewport ?\n options.additionalTransform + ' ' : '') + fabric.util.matrixToSVG(transform) + '\" ';\n\n if (this.type === 'linear') {\n markup = [\n '<linearGradient ',\n commonAttributes,\n ' x1=\"', coords.x1,\n '\" y1=\"', coords.y1,\n '\" x2=\"', coords.x2,\n '\" y2=\"', coords.y2,\n '\">\\n'\n ];\n }\n else if (this.type === 'radial') {\n // svg radial gradient has just 1 radius. the biggest.\n markup = [\n '<radialGradient ',\n commonAttributes,\n ' cx=\"', needsSwap ? coords.x1 : coords.x2,\n '\" cy=\"', needsSwap ? coords.y1 : coords.y2,\n '\" r=\"', needsSwap ? coords.r1 : coords.r2,\n '\" fx=\"', needsSwap ? coords.x2 : coords.x1,\n '\" fy=\"', needsSwap ? coords.y2 : coords.y1,\n '\">\\n'\n ];\n }\n\n if (this.type === 'radial') {\n if (needsSwap) {\n // svg goes from internal to external radius. if radius are inverted, swap color stops.\n colorStops = colorStops.concat();\n colorStops.reverse();\n for (i = 0, len = colorStops.length; i < len; i++) {\n colorStops[i].offset = 1 - colorStops[i].offset;\n }\n }\n var minRadius = Math.min(coords.r1, coords.r2);\n if (minRadius > 0) {\n // i have to shift all colorStops and add new one in 0.\n var maxRadius = Math.max(coords.r1, coords.r2),\n percentageShift = minRadius / maxRadius;\n for (i = 0, len = colorStops.length; i < len; i++) {\n colorStops[i].offset += percentageShift * (1 - colorStops[i].offset);\n }\n }\n }\n\n for (i = 0, len = colorStops.length; i < len; i++) {\n var colorStop = colorStops[i];\n markup.push(\n '<stop ',\n 'offset=\"', (colorStop.offset * 100) + '%',\n '\" style=\"stop-color:', colorStop.color,\n (typeof colorStop.opacity !== 'undefined' ? ';stop-opacity: ' + colorStop.opacity : ';'),\n '\"/>\\n'\n );\n }\n\n markup.push((this.type === 'linear' ? '</linearGradient>\\n' : '</radialGradient>\\n'));\n\n return markup.join('');\n },\n /* _TO_SVG_END_ */\n\n /**\n * Returns an instance of CanvasGradient\n * @param {CanvasRenderingContext2D} ctx Context to render on\n * @return {CanvasGradient}\n */\n toLive: function(ctx) {\n var gradient, coords = fabric.util.object.clone(this.coords), i, len;\n\n if (!this.type) {\n return;\n }\n\n if (this.type === 'linear') {\n gradient = ctx.createLinearGradient(\n coords.x1, coords.y1, coords.x2, coords.y2);\n }\n else if (this.type === 'radial') {\n gradient = ctx.createRadialGradient(\n coords.x1, coords.y1, coords.r1, coords.x2, coords.y2, coords.r2);\n }\n\n for (i = 0, len = this.colorStops.length; i < len; i++) {\n var color = this.colorStops[i].color,\n opacity = this.colorStops[i].opacity,\n offset = this.colorStops[i].offset;\n\n if (typeof opacity !== 'undefined') {\n color = new fabric.Color(color).setAlpha(opacity).toRgba();\n }\n gradient.addColorStop(offset, color);\n }\n\n return gradient;\n }\n });\n\n fabric.util.object.extend(fabric.Gradient, {\n\n /* _FROM_SVG_START_ */\n /**\n * Returns {@link fabric.Gradient} instance from an SVG element\n * @static\n * @memberOf fabric.Gradient\n * @param {SVGGradientElement} el SVG gradient element\n * @param {fabric.Object} instance\n * @param {String} opacityAttr A fill-opacity or stroke-opacity attribute to multiply to each stop's opacity.\n * @param {Object} svgOptions an object containing the size of the SVG in order to parse correctly graidents\n * that uses gradientUnits as 'userSpaceOnUse' and percentages.\n * @param {Object.number} viewBoxWidth width part of the viewBox attribute on svg\n * @param {Object.number} viewBoxHeight height part of the viewBox attribute on svg\n * @param {Object.number} width width part of the svg tag if viewBox is not specified\n * @param {Object.number} height height part of the svg tag if viewBox is not specified\n * @return {fabric.Gradient} Gradient instance\n * @see http://www.w3.org/TR/SVG/pservers.html#LinearGradientElement\n * @see http://www.w3.org/TR/SVG/pservers.html#RadialGradientElement\n */\n fromElement: function(el, instance, opacityAttr, svgOptions) {\n /**\n * @example:\n *\n * <linearGradient id=\"linearGrad1\">\n * <stop offset=\"0%\" stop-color=\"white\"/>\n * <stop offset=\"100%\" stop-color=\"black\"/>\n * </linearGradient>\n *\n * OR\n *\n * <linearGradient id=\"linearGrad2\">\n * <stop offset=\"0\" style=\"stop-color:rgb(255,255,255)\"/>\n * <stop offset=\"1\" style=\"stop-color:rgb(0,0,0)\"/>\n * </linearGradient>\n *\n * OR\n *\n * <radialGradient id=\"radialGrad1\">\n * <stop offset=\"0%\" stop-color=\"white\" stop-opacity=\"1\" />\n * <stop offset=\"50%\" stop-color=\"black\" stop-opacity=\"0.5\" />\n * <stop offset=\"100%\" stop-color=\"white\" stop-opacity=\"1\" />\n * </radialGradient>\n *\n * OR\n *\n * <radialGradient id=\"radialGrad2\">\n * <stop offset=\"0\" stop-color=\"rgb(255,255,255)\" />\n * <stop offset=\"0.5\" stop-color=\"rgb(0,0,0)\" />\n * <stop offset=\"1\" stop-color=\"rgb(255,255,255)\" />\n * </radialGradient>\n *\n */\n\n var multiplier = parseFloat(opacityAttr) / (/%$/.test(opacityAttr) ? 100 : 1);\n multiplier = multiplier < 0 ? 0 : multiplier > 1 ? 1 : multiplier;\n if (isNaN(multiplier)) {\n multiplier = 1;\n }\n\n var colorStopEls = el.getElementsByTagName('stop'),\n type,\n gradientUnits = el.getAttribute('gradientUnits') === 'userSpaceOnUse' ?\n 'pixels' : 'percentage',\n gradientTransform = el.getAttribute('gradientTransform') || '',\n colorStops = [],\n coords, i, offsetX = 0, offsetY = 0,\n transformMatrix;\n if (el.nodeName === 'linearGradient' || el.nodeName === 'LINEARGRADIENT') {\n type = 'linear';\n coords = getLinearCoords(el);\n }\n else {\n type = 'radial';\n coords = getRadialCoords(el);\n }\n\n for (i = colorStopEls.length; i--; ) {\n colorStops.push(getColorStop(colorStopEls[i], multiplier));\n }\n\n transformMatrix = fabric.parseTransformAttribute(gradientTransform);\n\n __convertPercentUnitsToValues(instance, coords, svgOptions, gradientUnits);\n\n if (gradientUnits === 'pixels') {\n offsetX = -instance.left;\n offsetY = -instance.top;\n }\n\n var gradient = new fabric.Gradient({\n id: el.getAttribute('id'),\n type: type,\n coords: coords,\n colorStops: colorStops,\n gradientUnits: gradientUnits,\n gradientTransform: transformMatrix,\n offsetX: offsetX,\n offsetY: offsetY,\n });\n\n return gradient;\n }\n /* _FROM_SVG_END_ */\n });\n\n /**\n * @private\n */\n function __convertPercentUnitsToValues(instance, options, svgOptions, gradientUnits) {\n var propValue, finalValue;\n Object.keys(options).forEach(function(prop) {\n propValue = options[prop];\n if (propValue === 'Infinity') {\n finalValue = 1;\n }\n else if (propValue === '-Infinity') {\n finalValue = 0;\n }\n else {\n finalValue = parseFloat(options[prop], 10);\n if (typeof propValue === 'string' && /^(\\d+\\.\\d+)%|(\\d+)%$/.test(propValue)) {\n finalValue *= 0.01;\n if (gradientUnits === 'pixels') {\n // then we need to fix those percentages here in svg parsing\n if (prop === 'x1' || prop === 'x2' || prop === 'r2') {\n finalValue *= svgOptions.viewBoxWidth || svgOptions.width;\n }\n if (prop === 'y1' || prop === 'y2') {\n finalValue *= svgOptions.viewBoxHeight || svgOptions.height;\n }\n }\n }\n }\n options[prop] = finalValue;\n });\n }\n})();\n\n\n(function() {\n\n 'use strict';\n\n var toFixed = fabric.util.toFixed;\n\n /**\n * Pattern class\n * @class fabric.Pattern\n * @see {@link http://fabricjs.com/patterns|Pattern demo}\n * @see {@link http://fabricjs.com/dynamic-patterns|DynamicPattern demo}\n * @see {@link fabric.Pattern#initialize} for constructor definition\n */\n\n\n fabric.Pattern = fabric.util.createClass(/** @lends fabric.Pattern.prototype */ {\n\n /**\n * Repeat property of a pattern (one of repeat, repeat-x, repeat-y or no-repeat)\n * @type String\n * @default\n */\n repeat: 'repeat',\n\n /**\n * Pattern horizontal offset from object's left/top corner\n * @type Number\n * @default\n */\n offsetX: 0,\n\n /**\n * Pattern vertical offset from object's left/top corner\n * @type Number\n * @default\n */\n offsetY: 0,\n\n /**\n * crossOrigin value (one of \"\", \"anonymous\", \"use-credentials\")\n * @see https://developer.mozilla.org/en-US/docs/HTML/CORS_settings_attributes\n * @type String\n * @default\n */\n crossOrigin: '',\n\n /**\n * transform matrix to change the pattern, imported from svgs.\n * @type Array\n * @default\n */\n patternTransform: null,\n\n /**\n * Constructor\n * @param {Object} [options] Options object\n * @param {Function} [callback] function to invoke after callback init.\n * @return {fabric.Pattern} thisArg\n */\n initialize: function(options, callback) {\n options || (options = { });\n\n this.id = fabric.Object.__uid++;\n this.setOptions(options);\n if (!options.source || (options.source && typeof options.source !== 'string')) {\n callback && callback(this);\n return;\n }\n else {\n // img src string\n var _this = this;\n this.source = fabric.util.createImage();\n fabric.util.loadImage(options.source, function(img, isError) {\n _this.source = img;\n callback && callback(_this, isError);\n }, null, this.crossOrigin);\n }\n },\n\n /**\n * Returns object representation of a pattern\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} Object representation of a pattern instance\n */\n toObject: function(propertiesToInclude) {\n var NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS,\n source, object;\n\n // <img> element\n if (typeof this.source.src === 'string') {\n source = this.source.src;\n }\n // <canvas> element\n else if (typeof this.source === 'object' && this.source.toDataURL) {\n source = this.source.toDataURL();\n }\n\n object = {\n type: 'pattern',\n source: source,\n repeat: this.repeat,\n crossOrigin: this.crossOrigin,\n offsetX: toFixed(this.offsetX, NUM_FRACTION_DIGITS),\n offsetY: toFixed(this.offsetY, NUM_FRACTION_DIGITS),\n patternTransform: this.patternTransform ? this.patternTransform.concat() : null\n };\n fabric.util.populateWithProperties(this, object, propertiesToInclude);\n\n return object;\n },\n\n /* _TO_SVG_START_ */\n /**\n * Returns SVG representation of a pattern\n * @param {fabric.Object} object\n * @return {String} SVG representation of a pattern\n */\n toSVG: function(object) {\n var patternSource = typeof this.source === 'function' ? this.source() : this.source,\n patternWidth = patternSource.width / object.width,\n patternHeight = patternSource.height / object.height,\n patternOffsetX = this.offsetX / object.width,\n patternOffsetY = this.offsetY / object.height,\n patternImgSrc = '';\n if (this.repeat === 'repeat-x' || this.repeat === 'no-repeat') {\n patternHeight = 1;\n if (patternOffsetY) {\n patternHeight += Math.abs(patternOffsetY);\n }\n }\n if (this.repeat === 'repeat-y' || this.repeat === 'no-repeat') {\n patternWidth = 1;\n if (patternOffsetX) {\n patternWidth += Math.abs(patternOffsetX);\n }\n\n }\n if (patternSource.src) {\n patternImgSrc = patternSource.src;\n }\n else if (patternSource.toDataURL) {\n patternImgSrc = patternSource.toDataURL();\n }\n\n return '<pattern id=\"SVGID_' + this.id +\n '\" x=\"' + patternOffsetX +\n '\" y=\"' + patternOffsetY +\n '\" width=\"' + patternWidth +\n '\" height=\"' + patternHeight + '\">\\n' +\n '<image x=\"0\" y=\"0\"' +\n ' width=\"' + patternSource.width +\n '\" height=\"' + patternSource.height +\n '\" xlink:href=\"' + patternImgSrc +\n '\"></image>\\n' +\n '</pattern>\\n';\n },\n /* _TO_SVG_END_ */\n\n setOptions: function(options) {\n for (var prop in options) {\n this[prop] = options[prop];\n }\n },\n\n /**\n * Returns an instance of CanvasPattern\n * @param {CanvasRenderingContext2D} ctx Context to create pattern\n * @return {CanvasPattern}\n */\n toLive: function(ctx) {\n var source = this.source;\n // if the image failed to load, return, and allow rest to continue loading\n if (!source) {\n return '';\n }\n\n // if an image\n if (typeof source.src !== 'undefined') {\n if (!source.complete) {\n return '';\n }\n if (source.naturalWidth === 0 || source.naturalHeight === 0) {\n return '';\n }\n }\n return ctx.createPattern(source, this.repeat);\n }\n });\n})();\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }),\n toFixed = fabric.util.toFixed;\n\n if (fabric.Shadow) {\n fabric.warn('fabric.Shadow is already defined.');\n return;\n }\n\n /**\n * Shadow class\n * @class fabric.Shadow\n * @see {@link http://fabricjs.com/shadows|Shadow demo}\n * @see {@link fabric.Shadow#initialize} for constructor definition\n */\n fabric.Shadow = fabric.util.createClass(/** @lends fabric.Shadow.prototype */ {\n\n /**\n * Shadow color\n * @type String\n * @default\n */\n color: 'rgb(0,0,0)',\n\n /**\n * Shadow blur\n * @type Number\n */\n blur: 0,\n\n /**\n * Shadow horizontal offset\n * @type Number\n * @default\n */\n offsetX: 0,\n\n /**\n * Shadow vertical offset\n * @type Number\n * @default\n */\n offsetY: 0,\n\n /**\n * Whether the shadow should affect stroke operations\n * @type Boolean\n * @default\n */\n affectStroke: false,\n\n /**\n * Indicates whether toObject should include default values\n * @type Boolean\n * @default\n */\n includeDefaultValues: true,\n\n /**\n * When `false`, the shadow will scale with the object.\n * When `true`, the shadow's offsetX, offsetY, and blur will not be affected by the object's scale.\n * default to false\n * @type Boolean\n * @default\n */\n nonScaling: false,\n\n /**\n * Constructor\n * @param {Object|String} [options] Options object with any of color, blur, offsetX, offsetY properties or string (e.g. \"rgba(0,0,0,0.2) 2px 2px 10px\")\n * @return {fabric.Shadow} thisArg\n */\n initialize: function(options) {\n\n if (typeof options === 'string') {\n options = this._parseShadow(options);\n }\n\n for (var prop in options) {\n this[prop] = options[prop];\n }\n\n this.id = fabric.Object.__uid++;\n },\n\n /**\n * @private\n * @param {String} shadow Shadow value to parse\n * @return {Object} Shadow object with color, offsetX, offsetY and blur\n */\n _parseShadow: function(shadow) {\n var shadowStr = shadow.trim(),\n offsetsAndBlur = fabric.Shadow.reOffsetsAndBlur.exec(shadowStr) || [],\n color = shadowStr.replace(fabric.Shadow.reOffsetsAndBlur, '') || 'rgb(0,0,0)';\n\n return {\n color: color.trim(),\n offsetX: parseInt(offsetsAndBlur[1], 10) || 0,\n offsetY: parseInt(offsetsAndBlur[2], 10) || 0,\n blur: parseInt(offsetsAndBlur[3], 10) || 0\n };\n },\n\n /**\n * Returns a string representation of an instance\n * @see http://www.w3.org/TR/css-text-decor-3/#text-shadow\n * @return {String} Returns CSS3 text-shadow declaration\n */\n toString: function() {\n return [this.offsetX, this.offsetY, this.blur, this.color].join('px ');\n },\n\n /* _TO_SVG_START_ */\n /**\n * Returns SVG representation of a shadow\n * @param {fabric.Object} object\n * @return {String} SVG representation of a shadow\n */\n toSVG: function(object) {\n var fBoxX = 40, fBoxY = 40, NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS,\n offset = fabric.util.rotateVector(\n { x: this.offsetX, y: this.offsetY },\n fabric.util.degreesToRadians(-object.angle)),\n BLUR_BOX = 20, color = new fabric.Color(this.color);\n\n if (object.width && object.height) {\n //http://www.w3.org/TR/SVG/filters.html#FilterEffectsRegion\n // we add some extra space to filter box to contain the blur ( 20 )\n fBoxX = toFixed((Math.abs(offset.x) + this.blur) / object.width, NUM_FRACTION_DIGITS) * 100 + BLUR_BOX;\n fBoxY = toFixed((Math.abs(offset.y) + this.blur) / object.height, NUM_FRACTION_DIGITS) * 100 + BLUR_BOX;\n }\n if (object.flipX) {\n offset.x *= -1;\n }\n if (object.flipY) {\n offset.y *= -1;\n }\n\n return (\n '<filter id=\"SVGID_' + this.id + '\" y=\"-' + fBoxY + '%\" height=\"' + (100 + 2 * fBoxY) + '%\" ' +\n 'x=\"-' + fBoxX + '%\" width=\"' + (100 + 2 * fBoxX) + '%\" ' + '>\\n' +\n '\\t<feGaussianBlur in=\"SourceAlpha\" stdDeviation=\"' +\n toFixed(this.blur ? this.blur / 2 : 0, NUM_FRACTION_DIGITS) + '\"></feGaussianBlur>\\n' +\n '\\t<feOffset dx=\"' + toFixed(offset.x, NUM_FRACTION_DIGITS) +\n '\" dy=\"' + toFixed(offset.y, NUM_FRACTION_DIGITS) + '\" result=\"oBlur\" ></feOffset>\\n' +\n '\\t<feFlood flood-color=\"' + color.toRgb() + '\" flood-opacity=\"' + color.getAlpha() + '\"/>\\n' +\n '\\t<feComposite in2=\"oBlur\" operator=\"in\" />\\n' +\n '\\t<feMerge>\\n' +\n '\\t\\t<feMergeNode></feMergeNode>\\n' +\n '\\t\\t<feMergeNode in=\"SourceGraphic\"></feMergeNode>\\n' +\n '\\t</feMerge>\\n' +\n '</filter>\\n');\n },\n /* _TO_SVG_END_ */\n\n /**\n * Returns object representation of a shadow\n * @return {Object} Object representation of a shadow instance\n */\n toObject: function() {\n if (this.includeDefaultValues) {\n return {\n color: this.color,\n blur: this.blur,\n offsetX: this.offsetX,\n offsetY: this.offsetY,\n affectStroke: this.affectStroke,\n nonScaling: this.nonScaling\n };\n }\n var obj = { }, proto = fabric.Shadow.prototype;\n\n ['color', 'blur', 'offsetX', 'offsetY', 'affectStroke', 'nonScaling'].forEach(function(prop) {\n if (this[prop] !== proto[prop]) {\n obj[prop] = this[prop];\n }\n }, this);\n\n return obj;\n }\n });\n\n /**\n * Regex matching shadow offsetX, offsetY and blur (ex: \"2px 2px 10px rgba(0,0,0,0.2)\", \"rgb(0,255,0) 2px 2px\")\n * @static\n * @field\n * @memberOf fabric.Shadow\n */\n // eslint-disable-next-line max-len\n fabric.Shadow.reOffsetsAndBlur = /(?:\\s|^)(-?\\d+(?:px)?(?:\\s?|$))?(-?\\d+(?:px)?(?:\\s?|$))?(\\d+(?:px)?)?(?:\\s?|$)(?:$|\\s)/;\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function () {\n\n 'use strict';\n\n if (fabric.StaticCanvas) {\n fabric.warn('fabric.StaticCanvas is already defined.');\n return;\n }\n\n // aliases for faster resolution\n var extend = fabric.util.object.extend,\n getElementOffset = fabric.util.getElementOffset,\n removeFromArray = fabric.util.removeFromArray,\n toFixed = fabric.util.toFixed,\n transformPoint = fabric.util.transformPoint,\n invertTransform = fabric.util.invertTransform,\n getNodeCanvas = fabric.util.getNodeCanvas,\n createCanvasElement = fabric.util.createCanvasElement,\n\n CANVAS_INIT_ERROR = new Error('Could not initialize `canvas` element');\n\n /**\n * Static canvas class\n * @class fabric.StaticCanvas\n * @mixes fabric.Collection\n * @mixes fabric.Observable\n * @see {@link http://fabricjs.com/static_canvas|StaticCanvas demo}\n * @see {@link fabric.StaticCanvas#initialize} for constructor definition\n * @fires before:render\n * @fires after:render\n * @fires canvas:cleared\n * @fires object:added\n * @fires object:removed\n */\n fabric.StaticCanvas = fabric.util.createClass(fabric.CommonMethods, /** @lends fabric.StaticCanvas.prototype */ {\n\n /**\n * Constructor\n * @param {HTMLElement | String} el <canvas> element to initialize instance on\n * @param {Object} [options] Options object\n * @return {Object} thisArg\n */\n initialize: function(el, options) {\n options || (options = { });\n this.renderAndResetBound = this.renderAndReset.bind(this);\n this.requestRenderAllBound = this.requestRenderAll.bind(this);\n this._initStatic(el, options);\n },\n\n /**\n * Background color of canvas instance.\n * Should be set via {@link fabric.StaticCanvas#setBackgroundColor}.\n * @type {(String|fabric.Pattern)}\n * @default\n */\n backgroundColor: '',\n\n /**\n * Background image of canvas instance.\n * since 2.4.0 image caching is active, please when putting an image as background, add to the\n * canvas property a reference to the canvas it is on. Otherwise the image cannot detect the zoom\n * vale. As an alternative you can disable image objectCaching\n * @type fabric.Image\n * @default\n */\n backgroundImage: null,\n\n /**\n * Overlay color of canvas instance.\n * Should be set via {@link fabric.StaticCanvas#setOverlayColor}\n * @since 1.3.9\n * @type {(String|fabric.Pattern)}\n * @default\n */\n overlayColor: '',\n\n /**\n * Overlay image of canvas instance.\n * since 2.4.0 image caching is active, please when putting an image as overlay, add to the\n * canvas property a reference to the canvas it is on. Otherwise the image cannot detect the zoom\n * vale. As an alternative you can disable image objectCaching\n * @type fabric.Image\n * @default\n */\n overlayImage: null,\n\n /**\n * Indicates whether toObject/toDatalessObject should include default values\n * if set to false, takes precedence over the object value.\n * @type Boolean\n * @default\n */\n includeDefaultValues: true,\n\n /**\n * Indicates whether objects' state should be saved\n * @type Boolean\n * @default\n */\n stateful: false,\n\n /**\n * Indicates whether {@link fabric.Collection.add}, {@link fabric.Collection.insertAt} and {@link fabric.Collection.remove},\n * {@link fabric.StaticCanvas.moveTo}, {@link fabric.StaticCanvas.clear} and many more, should also re-render canvas.\n * Disabling this option will not give a performance boost when adding/removing a lot of objects to/from canvas at once\n * since the renders are quequed and executed one per frame.\n * Disabling is suggested anyway and managing the renders of the app manually is not a big effort ( canvas.requestRenderAll() )\n * Left default to true to do not break documentation and old app, fiddles.\n * @type Boolean\n * @default\n */\n renderOnAddRemove: true,\n\n /**\n * Indicates whether object controls (borders/controls) are rendered above overlay image\n * @type Boolean\n * @default\n */\n controlsAboveOverlay: false,\n\n /**\n * Indicates whether the browser can be scrolled when using a touchscreen and dragging on the canvas\n * @type Boolean\n * @default\n */\n allowTouchScrolling: false,\n\n /**\n * Indicates whether this canvas will use image smoothing, this is on by default in browsers\n * @type Boolean\n * @default\n */\n imageSmoothingEnabled: true,\n\n /**\n * The transformation (in the format of Canvas transform) which focuses the viewport\n * @type Array\n * @default\n */\n viewportTransform: fabric.iMatrix.concat(),\n\n /**\n * if set to false background image is not affected by viewport transform\n * @since 1.6.3\n * @type Boolean\n * @default\n */\n backgroundVpt: true,\n\n /**\n * if set to false overlya image is not affected by viewport transform\n * @since 1.6.3\n * @type Boolean\n * @default\n */\n overlayVpt: true,\n\n /**\n * When true, canvas is scaled by devicePixelRatio for better rendering on retina screens\n * @type Boolean\n * @default\n */\n enableRetinaScaling: true,\n\n /**\n * Describe canvas element extension over design\n * properties are tl,tr,bl,br.\n * if canvas is not zoomed/panned those points are the four corner of canvas\n * if canvas is viewportTransformed you those points indicate the extension\n * of canvas element in plain untrasformed coordinates\n * The coordinates get updated with @method calcViewportBoundaries.\n * @memberOf fabric.StaticCanvas.prototype\n */\n vptCoords: { },\n\n /**\n * Based on vptCoords and object.aCoords, skip rendering of objects that\n * are not included in current viewport.\n * May greatly help in applications with crowded canvas and use of zoom/pan\n * If One of the corner of the bounding box of the object is on the canvas\n * the objects get rendered.\n * @memberOf fabric.StaticCanvas.prototype\n * @type Boolean\n * @default\n */\n skipOffscreen: true,\n\n /**\n * a fabricObject that, without stroke define a clipping area with their shape. filled in black\n * the clipPath object gets used when the canvas has rendered, and the context is placed in the\n * top left corner of the canvas.\n * clipPath will clip away controls, if you do not want this to happen use controlsAboveOverlay = true\n * @type fabric.Object\n */\n clipPath: undefined,\n\n /**\n * @private\n * @param {HTMLElement | String} el <canvas> element to initialize instance on\n * @param {Object} [options] Options object\n */\n _initStatic: function(el, options) {\n var cb = this.requestRenderAllBound;\n this._objects = [];\n this._createLowerCanvas(el);\n this._initOptions(options);\n // only initialize retina scaling once\n if (!this.interactive) {\n this._initRetinaScaling();\n }\n\n if (options.overlayImage) {\n this.setOverlayImage(options.overlayImage, cb);\n }\n if (options.backgroundImage) {\n this.setBackgroundImage(options.backgroundImage, cb);\n }\n if (options.backgroundColor) {\n this.setBackgroundColor(options.backgroundColor, cb);\n }\n if (options.overlayColor) {\n this.setOverlayColor(options.overlayColor, cb);\n }\n this.calcOffset();\n },\n\n /**\n * @private\n */\n _isRetinaScaling: function() {\n return (fabric.devicePixelRatio !== 1 && this.enableRetinaScaling);\n },\n\n /**\n * @private\n * @return {Number} retinaScaling if applied, otherwise 1;\n */\n getRetinaScaling: function() {\n return this._isRetinaScaling() ? fabric.devicePixelRatio : 1;\n },\n\n /**\n * @private\n */\n _initRetinaScaling: function() {\n if (!this._isRetinaScaling()) {\n return;\n }\n var scaleRatio = fabric.devicePixelRatio;\n this.__initRetinaScaling(scaleRatio, this.lowerCanvasEl, this.contextContainer);\n if (this.upperCanvasEl) {\n this.__initRetinaScaling(scaleRatio, this.upperCanvasEl, this.contextTop);\n }\n },\n\n __initRetinaScaling: function(scaleRatio, canvas, context) {\n canvas.setAttribute('width', this.width * scaleRatio);\n canvas.setAttribute('height', this.height * scaleRatio);\n context.scale(scaleRatio, scaleRatio);\n },\n\n\n /**\n * Calculates canvas element offset relative to the document\n * This method is also attached as \"resize\" event handler of window\n * @return {fabric.Canvas} instance\n * @chainable\n */\n calcOffset: function () {\n this._offset = getElementOffset(this.lowerCanvasEl);\n return this;\n },\n\n /**\n * Sets {@link fabric.StaticCanvas#overlayImage|overlay image} for this canvas\n * @param {(fabric.Image|String)} image fabric.Image instance or URL of an image to set overlay to\n * @param {Function} callback callback to invoke when image is loaded and set as an overlay\n * @param {Object} [options] Optional options to set for the {@link fabric.Image|overlay image}.\n * @return {fabric.Canvas} thisArg\n * @chainable\n * @see {@link http://jsfiddle.net/fabricjs/MnzHT/|jsFiddle demo}\n * @example <caption>Normal overlayImage with left/top = 0</caption>\n * canvas.setOverlayImage('http://fabricjs.com/assets/jail_cell_bars.png', canvas.renderAll.bind(canvas), {\n * // Needed to position overlayImage at 0/0\n * originX: 'left',\n * originY: 'top'\n * });\n * @example <caption>overlayImage with different properties</caption>\n * canvas.setOverlayImage('http://fabricjs.com/assets/jail_cell_bars.png', canvas.renderAll.bind(canvas), {\n * opacity: 0.5,\n * angle: 45,\n * left: 400,\n * top: 400,\n * originX: 'left',\n * originY: 'top'\n * });\n * @example <caption>Stretched overlayImage #1 - width/height correspond to canvas width/height</caption>\n * fabric.Image.fromURL('http://fabricjs.com/assets/jail_cell_bars.png', function(img, isError) {\n * img.set({width: canvas.width, height: canvas.height, originX: 'left', originY: 'top'});\n * canvas.setOverlayImage(img, canvas.renderAll.bind(canvas));\n * });\n * @example <caption>Stretched overlayImage #2 - width/height correspond to canvas width/height</caption>\n * canvas.setOverlayImage('http://fabricjs.com/assets/jail_cell_bars.png', canvas.renderAll.bind(canvas), {\n * width: canvas.width,\n * height: canvas.height,\n * // Needed to position overlayImage at 0/0\n * originX: 'left',\n * originY: 'top'\n * });\n * @example <caption>overlayImage loaded from cross-origin</caption>\n * canvas.setOverlayImage('http://fabricjs.com/assets/jail_cell_bars.png', canvas.renderAll.bind(canvas), {\n * opacity: 0.5,\n * angle: 45,\n * left: 400,\n * top: 400,\n * originX: 'left',\n * originY: 'top',\n * crossOrigin: 'anonymous'\n * });\n */\n setOverlayImage: function (image, callback, options) {\n return this.__setBgOverlayImage('overlayImage', image, callback, options);\n },\n\n /**\n * Sets {@link fabric.StaticCanvas#backgroundImage|background image} for this canvas\n * @param {(fabric.Image|String)} image fabric.Image instance or URL of an image to set background to\n * @param {Function} callback Callback to invoke when image is loaded and set as background\n * @param {Object} [options] Optional options to set for the {@link fabric.Image|background image}.\n * @return {fabric.Canvas} thisArg\n * @chainable\n * @see {@link http://jsfiddle.net/djnr8o7a/28/|jsFiddle demo}\n * @example <caption>Normal backgroundImage with left/top = 0</caption>\n * canvas.setBackgroundImage('http://fabricjs.com/assets/honey_im_subtle.png', canvas.renderAll.bind(canvas), {\n * // Needed to position backgroundImage at 0/0\n * originX: 'left',\n * originY: 'top'\n * });\n * @example <caption>backgroundImage with different properties</caption>\n * canvas.setBackgroundImage('http://fabricjs.com/assets/honey_im_subtle.png', canvas.renderAll.bind(canvas), {\n * opacity: 0.5,\n * angle: 45,\n * left: 400,\n * top: 400,\n * originX: 'left',\n * originY: 'top'\n * });\n * @example <caption>Stretched backgroundImage #1 - width/height correspond to canvas width/height</caption>\n * fabric.Image.fromURL('http://fabricjs.com/assets/honey_im_subtle.png', function(img, isError) {\n * img.set({width: canvas.width, height: canvas.height, originX: 'left', originY: 'top'});\n * canvas.setBackgroundImage(img, canvas.renderAll.bind(canvas));\n * });\n * @example <caption>Stretched backgroundImage #2 - width/height correspond to canvas width/height</caption>\n * canvas.setBackgroundImage('http://fabricjs.com/assets/honey_im_subtle.png', canvas.renderAll.bind(canvas), {\n * width: canvas.width,\n * height: canvas.height,\n * // Needed to position backgroundImage at 0/0\n * originX: 'left',\n * originY: 'top'\n * });\n * @example <caption>backgroundImage loaded from cross-origin</caption>\n * canvas.setBackgroundImage('http://fabricjs.com/assets/honey_im_subtle.png', canvas.renderAll.bind(canvas), {\n * opacity: 0.5,\n * angle: 45,\n * left: 400,\n * top: 400,\n * originX: 'left',\n * originY: 'top',\n * crossOrigin: 'anonymous'\n * });\n */\n // TODO: fix stretched examples\n setBackgroundImage: function (image, callback, options) {\n return this.__setBgOverlayImage('backgroundImage', image, callback, options);\n },\n\n /**\n * Sets {@link fabric.StaticCanvas#overlayColor|foreground color} for this canvas\n * @param {(String|fabric.Pattern)} overlayColor Color or pattern to set foreground color to\n * @param {Function} callback Callback to invoke when foreground color is set\n * @return {fabric.Canvas} thisArg\n * @chainable\n * @see {@link http://jsfiddle.net/fabricjs/pB55h/|jsFiddle demo}\n * @example <caption>Normal overlayColor - color value</caption>\n * canvas.setOverlayColor('rgba(255, 73, 64, 0.6)', canvas.renderAll.bind(canvas));\n * @example <caption>fabric.Pattern used as overlayColor</caption>\n * canvas.setOverlayColor({\n * source: 'http://fabricjs.com/assets/escheresque_ste.png'\n * }, canvas.renderAll.bind(canvas));\n * @example <caption>fabric.Pattern used as overlayColor with repeat and offset</caption>\n * canvas.setOverlayColor({\n * source: 'http://fabricjs.com/assets/escheresque_ste.png',\n * repeat: 'repeat',\n * offsetX: 200,\n * offsetY: 100\n * }, canvas.renderAll.bind(canvas));\n */\n setOverlayColor: function(overlayColor, callback) {\n return this.__setBgOverlayColor('overlayColor', overlayColor, callback);\n },\n\n /**\n * Sets {@link fabric.StaticCanvas#backgroundColor|background color} for this canvas\n * @param {(String|fabric.Pattern)} backgroundColor Color or pattern to set background color to\n * @param {Function} callback Callback to invoke when background color is set\n * @return {fabric.Canvas} thisArg\n * @chainable\n * @see {@link http://jsfiddle.net/fabricjs/hXzvk/|jsFiddle demo}\n * @example <caption>Normal backgroundColor - color value</caption>\n * canvas.setBackgroundColor('rgba(255, 73, 64, 0.6)', canvas.renderAll.bind(canvas));\n * @example <caption>fabric.Pattern used as backgroundColor</caption>\n * canvas.setBackgroundColor({\n * source: 'http://fabricjs.com/assets/escheresque_ste.png'\n * }, canvas.renderAll.bind(canvas));\n * @example <caption>fabric.Pattern used as backgroundColor with repeat and offset</caption>\n * canvas.setBackgroundColor({\n * source: 'http://fabricjs.com/assets/escheresque_ste.png',\n * repeat: 'repeat',\n * offsetX: 200,\n * offsetY: 100\n * }, canvas.renderAll.bind(canvas));\n */\n setBackgroundColor: function(backgroundColor, callback) {\n return this.__setBgOverlayColor('backgroundColor', backgroundColor, callback);\n },\n\n /**\n * @private\n * @param {String} property Property to set ({@link fabric.StaticCanvas#backgroundImage|backgroundImage}\n * or {@link fabric.StaticCanvas#overlayImage|overlayImage})\n * @param {(fabric.Image|String|null)} image fabric.Image instance, URL of an image or null to set background or overlay to\n * @param {Function} callback Callback to invoke when image is loaded and set as background or overlay. The first argument is the created image, the second argument is a flag indicating whether an error occured or not.\n * @param {Object} [options] Optional options to set for the {@link fabric.Image|image}.\n */\n __setBgOverlayImage: function(property, image, callback, options) {\n if (typeof image === 'string') {\n fabric.util.loadImage(image, function(img, isError) {\n if (img) {\n var instance = new fabric.Image(img, options);\n this[property] = instance;\n instance.canvas = this;\n }\n callback && callback(img, isError);\n }, this, options && options.crossOrigin);\n }\n else {\n options && image.setOptions(options);\n this[property] = image;\n image && (image.canvas = this);\n callback && callback(image, false);\n }\n\n return this;\n },\n\n /**\n * @private\n * @param {String} property Property to set ({@link fabric.StaticCanvas#backgroundColor|backgroundColor}\n * or {@link fabric.StaticCanvas#overlayColor|overlayColor})\n * @param {(Object|String|null)} color Object with pattern information, color value or null\n * @param {Function} [callback] Callback is invoked when color is set\n */\n __setBgOverlayColor: function(property, color, callback) {\n this[property] = color;\n this._initGradient(color, property);\n this._initPattern(color, property, callback);\n return this;\n },\n\n /**\n * @private\n */\n _createCanvasElement: function() {\n var element = createCanvasElement();\n if (!element) {\n throw CANVAS_INIT_ERROR;\n }\n if (!element.style) {\n element.style = { };\n }\n if (typeof element.getContext === 'undefined') {\n throw CANVAS_INIT_ERROR;\n }\n return element;\n },\n\n /**\n * @private\n * @param {Object} [options] Options object\n */\n _initOptions: function (options) {\n var lowerCanvasEl = this.lowerCanvasEl;\n this._setOptions(options);\n\n this.width = this.width || parseInt(lowerCanvasEl.width, 10) || 0;\n this.height = this.height || parseInt(lowerCanvasEl.height, 10) || 0;\n\n if (!this.lowerCanvasEl.style) {\n return;\n }\n\n lowerCanvasEl.width = this.width;\n lowerCanvasEl.height = this.height;\n\n lowerCanvasEl.style.width = this.width + 'px';\n lowerCanvasEl.style.height = this.height + 'px';\n\n this.viewportTransform = this.viewportTransform.slice();\n },\n\n /**\n * Creates a bottom canvas\n * @private\n * @param {HTMLElement} [canvasEl]\n */\n _createLowerCanvas: function (canvasEl) {\n // canvasEl === 'HTMLCanvasElement' does not work on jsdom/node\n if (canvasEl && canvasEl.getContext) {\n this.lowerCanvasEl = canvasEl;\n }\n else {\n this.lowerCanvasEl = fabric.util.getById(canvasEl) || this._createCanvasElement();\n }\n\n fabric.util.addClass(this.lowerCanvasEl, 'lower-canvas');\n\n if (this.interactive) {\n this._applyCanvasStyle(this.lowerCanvasEl);\n }\n\n this.contextContainer = this.lowerCanvasEl.getContext('2d');\n },\n\n /**\n * Returns canvas width (in px)\n * @return {Number}\n */\n getWidth: function () {\n return this.width;\n },\n\n /**\n * Returns canvas height (in px)\n * @return {Number}\n */\n getHeight: function () {\n return this.height;\n },\n\n /**\n * Sets width of this canvas instance\n * @param {Number|String} value Value to set width to\n * @param {Object} [options] Options object\n * @param {Boolean} [options.backstoreOnly=false] Set the given dimensions only as canvas backstore dimensions\n * @param {Boolean} [options.cssOnly=false] Set the given dimensions only as css dimensions\n * @return {fabric.Canvas} instance\n * @chainable true\n */\n setWidth: function (value, options) {\n return this.setDimensions({ width: value }, options);\n },\n\n /**\n * Sets height of this canvas instance\n * @param {Number|String} value Value to set height to\n * @param {Object} [options] Options object\n * @param {Boolean} [options.backstoreOnly=false] Set the given dimensions only as canvas backstore dimensions\n * @param {Boolean} [options.cssOnly=false] Set the given dimensions only as css dimensions\n * @return {fabric.Canvas} instance\n * @chainable true\n */\n setHeight: function (value, options) {\n return this.setDimensions({ height: value }, options);\n },\n\n /**\n * Sets dimensions (width, height) of this canvas instance. when options.cssOnly flag active you should also supply the unit of measure (px/%/em)\n * @param {Object} dimensions Object with width/height properties\n * @param {Number|String} [dimensions.width] Width of canvas element\n * @param {Number|String} [dimensions.height] Height of canvas element\n * @param {Object} [options] Options object\n * @param {Boolean} [options.backstoreOnly=false] Set the given dimensions only as canvas backstore dimensions\n * @param {Boolean} [options.cssOnly=false] Set the given dimensions only as css dimensions\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n setDimensions: function (dimensions, options) {\n var cssValue;\n\n options = options || {};\n\n for (var prop in dimensions) {\n cssValue = dimensions[prop];\n\n if (!options.cssOnly) {\n this._setBackstoreDimension(prop, dimensions[prop]);\n cssValue += 'px';\n this.hasLostContext = true;\n }\n\n if (!options.backstoreOnly) {\n this._setCssDimension(prop, cssValue);\n }\n }\n if (this._isCurrentlyDrawing) {\n this.freeDrawingBrush && this.freeDrawingBrush._setBrushStyles();\n }\n this._initRetinaScaling();\n this.calcOffset();\n\n if (!options.cssOnly) {\n this.requestRenderAll();\n }\n\n return this;\n },\n\n /**\n * Helper for setting width/height\n * @private\n * @param {String} prop property (width|height)\n * @param {Number} value value to set property to\n * @return {fabric.Canvas} instance\n * @chainable true\n */\n _setBackstoreDimension: function (prop, value) {\n this.lowerCanvasEl[prop] = value;\n\n if (this.upperCanvasEl) {\n this.upperCanvasEl[prop] = value;\n }\n\n if (this.cacheCanvasEl) {\n this.cacheCanvasEl[prop] = value;\n }\n\n this[prop] = value;\n\n return this;\n },\n\n /**\n * Helper for setting css width/height\n * @private\n * @param {String} prop property (width|height)\n * @param {String} value value to set property to\n * @return {fabric.Canvas} instance\n * @chainable true\n */\n _setCssDimension: function (prop, value) {\n this.lowerCanvasEl.style[prop] = value;\n\n if (this.upperCanvasEl) {\n this.upperCanvasEl.style[prop] = value;\n }\n\n if (this.wrapperEl) {\n this.wrapperEl.style[prop] = value;\n }\n\n return this;\n },\n\n /**\n * Returns canvas zoom level\n * @return {Number}\n */\n getZoom: function () {\n return this.viewportTransform[0];\n },\n\n /**\n * Sets viewport transform of this canvas instance\n * @param {Array} vpt the transform in the form of context.transform\n * @return {fabric.Canvas} instance\n * @chainable true\n */\n setViewportTransform: function (vpt) {\n var activeObject = this._activeObject, object, i, len;\n this.viewportTransform = vpt;\n for (i = 0, len = this._objects.length; i < len; i++) {\n object = this._objects[i];\n object.group || object.setCoords(true);\n }\n if (activeObject) {\n activeObject.setCoords();\n }\n this.calcViewportBoundaries();\n this.renderOnAddRemove && this.requestRenderAll();\n return this;\n },\n\n /**\n * Sets zoom level of this canvas instance, zoom centered around point\n * @param {fabric.Point} point to zoom with respect to\n * @param {Number} value to set zoom to, less than 1 zooms out\n * @return {fabric.Canvas} instance\n * @chainable true\n */\n zoomToPoint: function (point, value) {\n // TODO: just change the scale, preserve other transformations\n var before = point, vpt = this.viewportTransform.slice(0);\n point = transformPoint(point, invertTransform(this.viewportTransform));\n vpt[0] = value;\n vpt[3] = value;\n var after = transformPoint(point, vpt);\n vpt[4] += before.x - after.x;\n vpt[5] += before.y - after.y;\n return this.setViewportTransform(vpt);\n },\n\n /**\n * Sets zoom level of this canvas instance\n * @param {Number} value to set zoom to, less than 1 zooms out\n * @return {fabric.Canvas} instance\n * @chainable true\n */\n setZoom: function (value) {\n this.zoomToPoint(new fabric.Point(0, 0), value);\n return this;\n },\n\n /**\n * Pan viewport so as to place point at top left corner of canvas\n * @param {fabric.Point} point to move to\n * @return {fabric.Canvas} instance\n * @chainable true\n */\n absolutePan: function (point) {\n var vpt = this.viewportTransform.slice(0);\n vpt[4] = -point.x;\n vpt[5] = -point.y;\n return this.setViewportTransform(vpt);\n },\n\n /**\n * Pans viewpoint relatively\n * @param {fabric.Point} point (position vector) to move by\n * @return {fabric.Canvas} instance\n * @chainable true\n */\n relativePan: function (point) {\n return this.absolutePan(new fabric.Point(\n -point.x - this.viewportTransform[4],\n -point.y - this.viewportTransform[5]\n ));\n },\n\n /**\n * Returns <canvas> element corresponding to this instance\n * @return {HTMLCanvasElement}\n */\n getElement: function () {\n return this.lowerCanvasEl;\n },\n\n /**\n * @private\n * @param {fabric.Object} obj Object that was added\n */\n _onObjectAdded: function(obj) {\n this.stateful && obj.setupState();\n obj._set('canvas', this);\n obj.setCoords();\n this.fire('object:added', { target: obj });\n obj.fire('added');\n },\n\n /**\n * @private\n * @param {fabric.Object} obj Object that was removed\n */\n _onObjectRemoved: function(obj) {\n this.fire('object:removed', { target: obj });\n obj.fire('removed');\n delete obj.canvas;\n },\n\n /**\n * Clears specified context of canvas element\n * @param {CanvasRenderingContext2D} ctx Context to clear\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n clearContext: function(ctx) {\n ctx.clearRect(0, 0, this.width, this.height);\n return this;\n },\n\n /**\n * Returns context of canvas where objects are drawn\n * @return {CanvasRenderingContext2D}\n */\n getContext: function () {\n return this.contextContainer;\n },\n\n /**\n * Clears all contexts (background, main, top) of an instance\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n clear: function () {\n this._objects.length = 0;\n this.backgroundImage = null;\n this.overlayImage = null;\n this.backgroundColor = '';\n this.overlayColor = '';\n if (this._hasITextHandlers) {\n this.off('mouse:up', this._mouseUpITextHandler);\n this._iTextInstances = null;\n this._hasITextHandlers = false;\n }\n this.clearContext(this.contextContainer);\n this.fire('canvas:cleared');\n this.renderOnAddRemove && this.requestRenderAll();\n return this;\n },\n\n /**\n * Renders the canvas\n * @return {fabric.Canvas} instance\n * @chainable\n */\n renderAll: function () {\n var canvasToDrawOn = this.contextContainer;\n this.renderCanvas(canvasToDrawOn, this._objects);\n return this;\n },\n\n /**\n * Function created to be instance bound at initialization\n * used in requestAnimationFrame rendering\n * Let the fabricJS call it. If you call it manually you could have more\n * animationFrame stacking on to of each other\n * for an imperative rendering, use canvas.renderAll\n * @private\n * @return {fabric.Canvas} instance\n * @chainable\n */\n renderAndReset: function() {\n this.isRendering = 0;\n this.renderAll();\n },\n\n /**\n * Append a renderAll request to next animation frame.\n * unless one is already in progress, in that case nothing is done\n * a boolean flag will avoid appending more.\n * @return {fabric.Canvas} instance\n * @chainable\n */\n requestRenderAll: function () {\n if (!this.isRendering) {\n this.isRendering = fabric.util.requestAnimFrame(this.renderAndResetBound);\n }\n return this;\n },\n\n /**\n * Calculate the position of the 4 corner of canvas with current viewportTransform.\n * helps to determinate when an object is in the current rendering viewport using\n * object absolute coordinates ( aCoords )\n * @return {Object} points.tl\n * @chainable\n */\n calcViewportBoundaries: function() {\n var points = { }, width = this.width, height = this.height,\n iVpt = invertTransform(this.viewportTransform);\n points.tl = transformPoint({ x: 0, y: 0 }, iVpt);\n points.br = transformPoint({ x: width, y: height }, iVpt);\n points.tr = new fabric.Point(points.br.x, points.tl.y);\n points.bl = new fabric.Point(points.tl.x, points.br.y);\n this.vptCoords = points;\n return points;\n },\n\n cancelRequestedRender: function() {\n if (this.isRendering) {\n fabric.util.cancelAnimFrame(this.isRendering);\n this.isRendering = 0;\n }\n },\n\n /**\n * Renders background, objects, overlay and controls.\n * @param {CanvasRenderingContext2D} ctx\n * @param {Array} objects to render\n * @return {fabric.Canvas} instance\n * @chainable\n */\n renderCanvas: function(ctx, objects) {\n var v = this.viewportTransform, path = this.clipPath;\n this.cancelRequestedRender();\n this.calcViewportBoundaries();\n this.clearContext(ctx);\n fabric.util.setImageSmoothing(ctx, this.imageSmoothingEnabled);\n this.fire('before:render', { ctx: ctx, });\n this._renderBackground(ctx);\n\n ctx.save();\n //apply viewport transform once for all rendering process\n ctx.transform(v[0], v[1], v[2], v[3], v[4], v[5]);\n this._renderObjects(ctx, objects);\n ctx.restore();\n if (!this.controlsAboveOverlay && this.interactive) {\n this.drawControls(ctx);\n }\n if (path) {\n path.canvas = this;\n // needed to setup a couple of variables\n path.shouldCache();\n path._transformDone = true;\n path.renderCache({ forClipping: true });\n this.drawClipPathOnCanvas(ctx);\n }\n this._renderOverlay(ctx);\n if (this.controlsAboveOverlay && this.interactive) {\n this.drawControls(ctx);\n }\n this.fire('after:render', { ctx: ctx, });\n },\n\n /**\n * Paint the cached clipPath on the lowerCanvasEl\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n drawClipPathOnCanvas: function(ctx) {\n var v = this.viewportTransform, path = this.clipPath;\n ctx.save();\n ctx.transform(v[0], v[1], v[2], v[3], v[4], v[5]);\n // DEBUG: uncomment this line, comment the following\n // ctx.globalAlpha = 0.4;\n ctx.globalCompositeOperation = 'destination-in';\n path.transform(ctx);\n ctx.scale(1 / path.zoomX, 1 / path.zoomY);\n ctx.drawImage(path._cacheCanvas, -path.cacheTranslationX, -path.cacheTranslationY);\n ctx.restore();\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n * @param {Array} objects to render\n */\n _renderObjects: function(ctx, objects) {\n var i, len;\n for (i = 0, len = objects.length; i < len; ++i) {\n objects[i] && objects[i].render(ctx);\n }\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n * @param {string} property 'background' or 'overlay'\n */\n _renderBackgroundOrOverlay: function(ctx, property) {\n var fill = this[property + 'Color'], object = this[property + 'Image'],\n v = this.viewportTransform, needsVpt = this[property + 'Vpt'];\n if (!fill && !object) {\n return;\n }\n if (fill) {\n ctx.save();\n ctx.beginPath();\n ctx.moveTo(0, 0);\n ctx.lineTo(this.width, 0);\n ctx.lineTo(this.width, this.height);\n ctx.lineTo(0, this.height);\n ctx.closePath();\n ctx.fillStyle = fill.toLive\n ? fill.toLive(ctx, this)\n : fill;\n if (needsVpt) {\n ctx.transform(v[0], v[1], v[2], v[3], v[4], v[5]);\n }\n ctx.transform(1, 0, 0, 1, fill.offsetX || 0, fill.offsetY || 0);\n var m = fill.gradientTransform || fill.patternTransform;\n m && ctx.transform(m[0], m[1], m[2], m[3], m[4], m[5]);\n ctx.fill();\n ctx.restore();\n }\n if (object) {\n ctx.save();\n if (needsVpt) {\n ctx.transform(v[0], v[1], v[2], v[3], v[4], v[5]);\n }\n object.render(ctx);\n ctx.restore();\n }\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderBackground: function(ctx) {\n this._renderBackgroundOrOverlay(ctx, 'background');\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderOverlay: function(ctx) {\n this._renderBackgroundOrOverlay(ctx, 'overlay');\n },\n\n /**\n * Returns coordinates of a center of canvas.\n * Returned value is an object with top and left properties\n * @return {Object} object with \"top\" and \"left\" number values\n */\n getCenter: function () {\n return {\n top: this.height / 2,\n left: this.width / 2\n };\n },\n\n /**\n * Centers object horizontally in the canvas\n * @param {fabric.Object} object Object to center horizontally\n * @return {fabric.Canvas} thisArg\n */\n centerObjectH: function (object) {\n return this._centerObject(object, new fabric.Point(this.getCenter().left, object.getCenterPoint().y));\n },\n\n /**\n * Centers object vertically in the canvas\n * @param {fabric.Object} object Object to center vertically\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n centerObjectV: function (object) {\n return this._centerObject(object, new fabric.Point(object.getCenterPoint().x, this.getCenter().top));\n },\n\n /**\n * Centers object vertically and horizontally in the canvas\n * @param {fabric.Object} object Object to center vertically and horizontally\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n centerObject: function(object) {\n var center = this.getCenter();\n\n return this._centerObject(object, new fabric.Point(center.left, center.top));\n },\n\n /**\n * Centers object vertically and horizontally in the viewport\n * @param {fabric.Object} object Object to center vertically and horizontally\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n viewportCenterObject: function(object) {\n var vpCenter = this.getVpCenter();\n\n return this._centerObject(object, vpCenter);\n },\n\n /**\n * Centers object horizontally in the viewport, object.top is unchanged\n * @param {fabric.Object} object Object to center vertically and horizontally\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n viewportCenterObjectH: function(object) {\n var vpCenter = this.getVpCenter();\n this._centerObject(object, new fabric.Point(vpCenter.x, object.getCenterPoint().y));\n return this;\n },\n\n /**\n * Centers object Vertically in the viewport, object.top is unchanged\n * @param {fabric.Object} object Object to center vertically and horizontally\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n viewportCenterObjectV: function(object) {\n var vpCenter = this.getVpCenter();\n\n return this._centerObject(object, new fabric.Point(object.getCenterPoint().x, vpCenter.y));\n },\n\n /**\n * Calculate the point in canvas that correspond to the center of actual viewport.\n * @return {fabric.Point} vpCenter, viewport center\n * @chainable\n */\n getVpCenter: function() {\n var center = this.getCenter(),\n iVpt = invertTransform(this.viewportTransform);\n return transformPoint({ x: center.left, y: center.top }, iVpt);\n },\n\n /**\n * @private\n * @param {fabric.Object} object Object to center\n * @param {fabric.Point} center Center point\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n _centerObject: function(object, center) {\n object.setPositionByOrigin(center, 'center', 'center');\n object.setCoords();\n this.renderOnAddRemove && this.requestRenderAll();\n return this;\n },\n\n /**\n * Returs dataless JSON representation of canvas\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {String} json string\n */\n toDatalessJSON: function (propertiesToInclude) {\n return this.toDatalessObject(propertiesToInclude);\n },\n\n /**\n * Returns object representation of canvas\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} object representation of an instance\n */\n toObject: function (propertiesToInclude) {\n return this._toObjectMethod('toObject', propertiesToInclude);\n },\n\n /**\n * Returns dataless object representation of canvas\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} object representation of an instance\n */\n toDatalessObject: function (propertiesToInclude) {\n return this._toObjectMethod('toDatalessObject', propertiesToInclude);\n },\n\n /**\n * @private\n */\n _toObjectMethod: function (methodName, propertiesToInclude) {\n\n var clipPath = this.clipPath, data = {\n version: fabric.version,\n objects: this._toObjects(methodName, propertiesToInclude),\n };\n if (clipPath) {\n data.clipPath = this._toObject(this.clipPath, methodName, propertiesToInclude);\n }\n extend(data, this.__serializeBgOverlay(methodName, propertiesToInclude));\n\n fabric.util.populateWithProperties(this, data, propertiesToInclude);\n\n return data;\n },\n\n /**\n * @private\n */\n _toObjects: function(methodName, propertiesToInclude) {\n return this._objects.filter(function(object) {\n return !object.excludeFromExport;\n }).map(function(instance) {\n return this._toObject(instance, methodName, propertiesToInclude);\n }, this);\n },\n\n /**\n * @private\n */\n _toObject: function(instance, methodName, propertiesToInclude) {\n var originalValue;\n\n if (!this.includeDefaultValues) {\n originalValue = instance.includeDefaultValues;\n instance.includeDefaultValues = false;\n }\n\n var object = instance[methodName](propertiesToInclude);\n if (!this.includeDefaultValues) {\n instance.includeDefaultValues = originalValue;\n }\n return object;\n },\n\n /**\n * @private\n */\n __serializeBgOverlay: function(methodName, propertiesToInclude) {\n var data = { }, bgImage = this.backgroundImage, overlay = this.overlayImage;\n\n if (this.backgroundColor) {\n data.background = this.backgroundColor.toObject\n ? this.backgroundColor.toObject(propertiesToInclude)\n : this.backgroundColor;\n }\n\n if (this.overlayColor) {\n data.overlay = this.overlayColor.toObject\n ? this.overlayColor.toObject(propertiesToInclude)\n : this.overlayColor;\n }\n if (bgImage && !bgImage.excludeFromExport) {\n data.backgroundImage = this._toObject(bgImage, methodName, propertiesToInclude);\n }\n if (overlay && !overlay.excludeFromExport) {\n data.overlayImage = this._toObject(overlay, methodName, propertiesToInclude);\n }\n\n return data;\n },\n\n /* _TO_SVG_START_ */\n /**\n * When true, getSvgTransform() will apply the StaticCanvas.viewportTransform to the SVG transformation. When true,\n * a zoomed canvas will then produce zoomed SVG output.\n * @type Boolean\n * @default\n */\n svgViewportTransformation: true,\n\n /**\n * Returns SVG representation of canvas\n * @function\n * @param {Object} [options] Options object for SVG output\n * @param {Boolean} [options.suppressPreamble=false] If true xml tag is not included\n * @param {Object} [options.viewBox] SVG viewbox object\n * @param {Number} [options.viewBox.x] x-cooridnate of viewbox\n * @param {Number} [options.viewBox.y] y-coordinate of viewbox\n * @param {Number} [options.viewBox.width] Width of viewbox\n * @param {Number} [options.viewBox.height] Height of viewbox\n * @param {String} [options.encoding=UTF-8] Encoding of SVG output\n * @param {String} [options.width] desired width of svg with or without units\n * @param {String} [options.height] desired height of svg with or without units\n * @param {Function} [reviver] Method for further parsing of svg elements, called after each fabric object converted into svg representation.\n * @return {String} SVG string\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-3#serialization}\n * @see {@link http://jsfiddle.net/fabricjs/jQ3ZZ/|jsFiddle demo}\n * @example <caption>Normal SVG output</caption>\n * var svg = canvas.toSVG();\n * @example <caption>SVG output without preamble (without <?xml ../>)</caption>\n * var svg = canvas.toSVG({suppressPreamble: true});\n * @example <caption>SVG output with viewBox attribute</caption>\n * var svg = canvas.toSVG({\n * viewBox: {\n * x: 100,\n * y: 100,\n * width: 200,\n * height: 300\n * }\n * });\n * @example <caption>SVG output with different encoding (default: UTF-8)</caption>\n * var svg = canvas.toSVG({encoding: 'ISO-8859-1'});\n * @example <caption>Modify SVG output with reviver function</caption>\n * var svg = canvas.toSVG(null, function(svg) {\n * return svg.replace('stroke-dasharray: ; stroke-linecap: butt; stroke-linejoin: miter; stroke-miterlimit: 10; ', '');\n * });\n */\n toSVG: function(options, reviver) {\n options || (options = { });\n options.reviver = reviver;\n var markup = [];\n\n this._setSVGPreamble(markup, options);\n this._setSVGHeader(markup, options);\n if (this.clipPath) {\n markup.push('<g clip-path=\"url(#' + this.clipPath.clipPathId + ')\" >\\n');\n }\n this._setSVGBgOverlayColor(markup, 'background');\n this._setSVGBgOverlayImage(markup, 'backgroundImage', reviver);\n this._setSVGObjects(markup, reviver);\n if (this.clipPath) {\n markup.push('</g>\\n');\n }\n this._setSVGBgOverlayColor(markup, 'overlay');\n this._setSVGBgOverlayImage(markup, 'overlayImage', reviver);\n\n markup.push('</svg>');\n\n return markup.join('');\n },\n\n /**\n * @private\n */\n _setSVGPreamble: function(markup, options) {\n if (options.suppressPreamble) {\n return;\n }\n markup.push(\n '<?xml version=\"1.0\" encoding=\"', (options.encoding || 'UTF-8'), '\" standalone=\"no\" ?>\\n',\n '<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\" ',\n '\"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\\n'\n );\n },\n\n /**\n * @private\n */\n _setSVGHeader: function(markup, options) {\n var width = options.width || this.width,\n height = options.height || this.height,\n vpt, viewBox = 'viewBox=\"0 0 ' + this.width + ' ' + this.height + '\" ',\n NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS;\n\n if (options.viewBox) {\n viewBox = 'viewBox=\"' +\n options.viewBox.x + ' ' +\n options.viewBox.y + ' ' +\n options.viewBox.width + ' ' +\n options.viewBox.height + '\" ';\n }\n else {\n if (this.svgViewportTransformation) {\n vpt = this.viewportTransform;\n viewBox = 'viewBox=\"' +\n toFixed(-vpt[4] / vpt[0], NUM_FRACTION_DIGITS) + ' ' +\n toFixed(-vpt[5] / vpt[3], NUM_FRACTION_DIGITS) + ' ' +\n toFixed(this.width / vpt[0], NUM_FRACTION_DIGITS) + ' ' +\n toFixed(this.height / vpt[3], NUM_FRACTION_DIGITS) + '\" ';\n }\n }\n\n markup.push(\n '<svg ',\n 'xmlns=\"http://www.w3.org/2000/svg\" ',\n 'xmlns:xlink=\"http://www.w3.org/1999/xlink\" ',\n 'version=\"1.1\" ',\n 'width=\"', width, '\" ',\n 'height=\"', height, '\" ',\n viewBox,\n 'xml:space=\"preserve\">\\n',\n '<desc>Created with Fabric.js ', fabric.version, '</desc>\\n',\n '<defs>\\n',\n this.createSVGFontFacesMarkup(),\n this.createSVGRefElementsMarkup(),\n this.createSVGClipPathMarkup(options),\n '</defs>\\n'\n );\n },\n\n createSVGClipPathMarkup: function(options) {\n var clipPath = this.clipPath;\n if (clipPath) {\n clipPath.clipPathId = 'CLIPPATH_' + fabric.Object.__uid++;\n return '<clipPath id=\"' + clipPath.clipPathId + '\" >\\n' +\n this.clipPath.toClipPathSVG(options.reviver) +\n '</clipPath>\\n';\n }\n return '';\n },\n\n /**\n * Creates markup containing SVG referenced elements like patterns, gradients etc.\n * @return {String}\n */\n createSVGRefElementsMarkup: function() {\n var _this = this,\n markup = ['background', 'overlay'].map(function(prop) {\n var fill = _this[prop + 'Color'];\n if (fill && fill.toLive) {\n var shouldTransform = _this[prop + 'Vpt'], vpt = _this.viewportTransform,\n object = {\n width: _this.width / (shouldTransform ? vpt[0] : 1),\n height: _this.height / (shouldTransform ? vpt[3] : 1)\n };\n return fill.toSVG(\n object,\n { additionalTransform: shouldTransform ? fabric.util.matrixToSVG(vpt) : '' }\n );\n }\n });\n return markup.join('');\n },\n\n /**\n * Creates markup containing SVG font faces,\n * font URLs for font faces must be collected by developers\n * and are not extracted from the DOM by fabricjs\n * @param {Array} objects Array of fabric objects\n * @return {String}\n */\n createSVGFontFacesMarkup: function() {\n var markup = '', fontList = { }, obj, fontFamily,\n style, row, rowIndex, _char, charIndex, i, len,\n fontPaths = fabric.fontPaths, objects = [];\n\n this._objects.forEach(function add(object) {\n objects.push(object);\n if (object._objects) {\n object._objects.forEach(add);\n }\n });\n\n for (i = 0, len = objects.length; i < len; i++) {\n obj = objects[i];\n fontFamily = obj.fontFamily;\n if (obj.type.indexOf('text') === -1 || fontList[fontFamily] || !fontPaths[fontFamily]) {\n continue;\n }\n fontList[fontFamily] = true;\n if (!obj.styles) {\n continue;\n }\n style = obj.styles;\n for (rowIndex in style) {\n row = style[rowIndex];\n for (charIndex in row) {\n _char = row[charIndex];\n fontFamily = _char.fontFamily;\n if (!fontList[fontFamily] && fontPaths[fontFamily]) {\n fontList[fontFamily] = true;\n }\n }\n }\n }\n\n for (var j in fontList) {\n markup += [\n '\\t\\t@font-face {\\n',\n '\\t\\t\\tfont-family: \\'', j, '\\';\\n',\n '\\t\\t\\tsrc: url(\\'', fontPaths[j], '\\');\\n',\n '\\t\\t}\\n'\n ].join('');\n }\n\n if (markup) {\n markup = [\n '\\t<style type=\"text/css\">',\n '<![CDATA[\\n',\n markup,\n ']]>',\n '</style>\\n'\n ].join('');\n }\n\n return markup;\n },\n\n /**\n * @private\n */\n _setSVGObjects: function(markup, reviver) {\n var instance, i, len, objects = this._objects;\n for (i = 0, len = objects.length; i < len; i++) {\n instance = objects[i];\n if (instance.excludeFromExport) {\n continue;\n }\n this._setSVGObject(markup, instance, reviver);\n }\n },\n\n /**\n * @private\n */\n _setSVGObject: function(markup, instance, reviver) {\n markup.push(instance.toSVG(reviver));\n },\n\n /**\n * @private\n */\n _setSVGBgOverlayImage: function(markup, property, reviver) {\n if (this[property] && !this[property].excludeFromExport && this[property].toSVG) {\n markup.push(this[property].toSVG(reviver));\n }\n },\n\n /**\n * @private\n */\n _setSVGBgOverlayColor: function(markup, property) {\n var filler = this[property + 'Color'], vpt = this.viewportTransform, finalWidth = this.width,\n finalHeight = this.height;\n if (!filler) {\n return;\n }\n if (filler.toLive) {\n var repeat = filler.repeat, iVpt = fabric.util.invertTransform(vpt), shouldInvert = this[property + 'Vpt'],\n additionalTransform = shouldInvert ? fabric.util.matrixToSVG(iVpt) : '';\n markup.push(\n '<rect transform=\"' + additionalTransform + ' translate(', finalWidth / 2, ',', finalHeight / 2, ')\"',\n ' x=\"', filler.offsetX - finalWidth / 2,\n '\" y=\"', filler.offsetY - finalHeight / 2, '\" ',\n 'width=\"',\n (repeat === 'repeat-y' || repeat === 'no-repeat'\n ? filler.source.width\n : finalWidth ),\n '\" height=\"',\n (repeat === 'repeat-x' || repeat === 'no-repeat'\n ? filler.source.height\n : finalHeight),\n '\" fill=\"url(#SVGID_' + filler.id + ')\"',\n '></rect>\\n'\n );\n }\n else {\n markup.push(\n '<rect x=\"0\" y=\"0\" width=\"100%\" height=\"100%\" ',\n 'fill=\"', filler, '\"',\n '></rect>\\n'\n );\n }\n },\n /* _TO_SVG_END_ */\n\n /**\n * Moves an object or the objects of a multiple selection\n * to the bottom of the stack of drawn objects\n * @param {fabric.Object} object Object to send to back\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n sendToBack: function (object) {\n if (!object) {\n return this;\n }\n var activeSelection = this._activeObject,\n i, obj, objs;\n if (object === activeSelection && object.type === 'activeSelection') {\n objs = activeSelection._objects;\n for (i = objs.length; i--;) {\n obj = objs[i];\n removeFromArray(this._objects, obj);\n this._objects.unshift(obj);\n }\n }\n else {\n removeFromArray(this._objects, object);\n this._objects.unshift(object);\n }\n this.renderOnAddRemove && this.requestRenderAll();\n return this;\n },\n\n /**\n * Moves an object or the objects of a multiple selection\n * to the top of the stack of drawn objects\n * @param {fabric.Object} object Object to send\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n bringToFront: function (object) {\n if (!object) {\n return this;\n }\n var activeSelection = this._activeObject,\n i, obj, objs;\n if (object === activeSelection && object.type === 'activeSelection') {\n objs = activeSelection._objects;\n for (i = 0; i < objs.length; i++) {\n obj = objs[i];\n removeFromArray(this._objects, obj);\n this._objects.push(obj);\n }\n }\n else {\n removeFromArray(this._objects, object);\n this._objects.push(object);\n }\n this.renderOnAddRemove && this.requestRenderAll();\n return this;\n },\n\n /**\n * Moves an object or a selection down in stack of drawn objects\n * An optional paramter, intersecting allowes to move the object in behind\n * the first intersecting object. Where intersection is calculated with\n * bounding box. If no intersection is found, there will not be change in the\n * stack.\n * @param {fabric.Object} object Object to send\n * @param {Boolean} [intersecting] If `true`, send object behind next lower intersecting object\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n sendBackwards: function (object, intersecting) {\n if (!object) {\n return this;\n }\n var activeSelection = this._activeObject,\n i, obj, idx, newIdx, objs, objsMoved = 0;\n\n if (object === activeSelection && object.type === 'activeSelection') {\n objs = activeSelection._objects;\n for (i = 0; i < objs.length; i++) {\n obj = objs[i];\n idx = this._objects.indexOf(obj);\n if (idx > 0 + objsMoved) {\n newIdx = idx - 1;\n removeFromArray(this._objects, obj);\n this._objects.splice(newIdx, 0, obj);\n }\n objsMoved++;\n }\n }\n else {\n idx = this._objects.indexOf(object);\n if (idx !== 0) {\n // if object is not on the bottom of stack\n newIdx = this._findNewLowerIndex(object, idx, intersecting);\n removeFromArray(this._objects, object);\n this._objects.splice(newIdx, 0, object);\n }\n }\n this.renderOnAddRemove && this.requestRenderAll();\n return this;\n },\n\n /**\n * @private\n */\n _findNewLowerIndex: function(object, idx, intersecting) {\n var newIdx, i;\n\n if (intersecting) {\n newIdx = idx;\n\n // traverse down the stack looking for the nearest intersecting object\n for (i = idx - 1; i >= 0; --i) {\n\n var isIntersecting = object.intersectsWithObject(this._objects[i]) ||\n object.isContainedWithinObject(this._objects[i]) ||\n this._objects[i].isContainedWithinObject(object);\n\n if (isIntersecting) {\n newIdx = i;\n break;\n }\n }\n }\n else {\n newIdx = idx - 1;\n }\n\n return newIdx;\n },\n\n /**\n * Moves an object or a selection up in stack of drawn objects\n * An optional paramter, intersecting allowes to move the object in front\n * of the first intersecting object. Where intersection is calculated with\n * bounding box. If no intersection is found, there will not be change in the\n * stack.\n * @param {fabric.Object} object Object to send\n * @param {Boolean} [intersecting] If `true`, send object in front of next upper intersecting object\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n bringForward: function (object, intersecting) {\n if (!object) {\n return this;\n }\n var activeSelection = this._activeObject,\n i, obj, idx, newIdx, objs, objsMoved = 0;\n\n if (object === activeSelection && object.type === 'activeSelection') {\n objs = activeSelection._objects;\n for (i = objs.length; i--;) {\n obj = objs[i];\n idx = this._objects.indexOf(obj);\n if (idx < this._objects.length - 1 - objsMoved) {\n newIdx = idx + 1;\n removeFromArray(this._objects, obj);\n this._objects.splice(newIdx, 0, obj);\n }\n objsMoved++;\n }\n }\n else {\n idx = this._objects.indexOf(object);\n if (idx !== this._objects.length - 1) {\n // if object is not on top of stack (last item in an array)\n newIdx = this._findNewUpperIndex(object, idx, intersecting);\n removeFromArray(this._objects, object);\n this._objects.splice(newIdx, 0, object);\n }\n }\n this.renderOnAddRemove && this.requestRenderAll();\n return this;\n },\n\n /**\n * @private\n */\n _findNewUpperIndex: function(object, idx, intersecting) {\n var newIdx, i, len;\n\n if (intersecting) {\n newIdx = idx;\n\n // traverse up the stack looking for the nearest intersecting object\n for (i = idx + 1, len = this._objects.length; i < len; ++i) {\n\n var isIntersecting = object.intersectsWithObject(this._objects[i]) ||\n object.isContainedWithinObject(this._objects[i]) ||\n this._objects[i].isContainedWithinObject(object);\n\n if (isIntersecting) {\n newIdx = i;\n break;\n }\n }\n }\n else {\n newIdx = idx + 1;\n }\n\n return newIdx;\n },\n\n /**\n * Moves an object to specified level in stack of drawn objects\n * @param {fabric.Object} object Object to send\n * @param {Number} index Position to move to\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n moveTo: function (object, index) {\n removeFromArray(this._objects, object);\n this._objects.splice(index, 0, object);\n return this.renderOnAddRemove && this.requestRenderAll();\n },\n\n /**\n * Clears a canvas element and dispose objects\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n dispose: function () {\n // cancel eventually ongoing renders\n if (this.isRendering) {\n fabric.util.cancelAnimFrame(this.isRendering);\n this.isRendering = 0;\n }\n this.forEachObject(function(object) {\n object.dispose && object.dispose();\n });\n this._objects = [];\n if (this.backgroundImage && this.backgroundImage.dispose) {\n this.backgroundImage.dispose();\n }\n this.backgroundImage = null;\n if (this.overlayImage && this.overlayImage.dispose) {\n this.overlayImage.dispose();\n }\n this.overlayImage = null;\n this._iTextInstances = null;\n this.contextContainer = null;\n fabric.util.cleanUpJsdomNode(this.lowerCanvasEl);\n this.lowerCanvasEl = undefined;\n return this;\n },\n\n /**\n * Returns a string representation of an instance\n * @return {String} string representation of an instance\n */\n toString: function () {\n return '#<fabric.Canvas (' + this.complexity() + '): ' +\n '{ objects: ' + this._objects.length + ' }>';\n }\n });\n\n extend(fabric.StaticCanvas.prototype, fabric.Observable);\n extend(fabric.StaticCanvas.prototype, fabric.Collection);\n extend(fabric.StaticCanvas.prototype, fabric.DataURLExporter);\n\n extend(fabric.StaticCanvas, /** @lends fabric.StaticCanvas */ {\n\n /**\n * @static\n * @type String\n * @default\n */\n EMPTY_JSON: '{\"objects\": [], \"background\": \"white\"}',\n\n /**\n * Provides a way to check support of some of the canvas methods\n * (either those of HTMLCanvasElement itself, or rendering context)\n *\n * @param {String} methodName Method to check support for;\n * Could be one of \"setLineDash\"\n * @return {Boolean | null} `true` if method is supported (or at least exists),\n * `null` if canvas element or context can not be initialized\n */\n supports: function (methodName) {\n var el = createCanvasElement();\n\n if (!el || !el.getContext) {\n return null;\n }\n\n var ctx = el.getContext('2d');\n if (!ctx) {\n return null;\n }\n\n switch (methodName) {\n\n case 'setLineDash':\n return typeof ctx.setLineDash !== 'undefined';\n\n default:\n return null;\n }\n }\n });\n\n /**\n * Returns JSON representation of canvas\n * @function\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {String} JSON string\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-3#serialization}\n * @see {@link http://jsfiddle.net/fabricjs/pec86/|jsFiddle demo}\n * @example <caption>JSON without additional properties</caption>\n * var json = canvas.toJSON();\n * @example <caption>JSON with additional properties included</caption>\n * var json = canvas.toJSON(['lockMovementX', 'lockMovementY', 'lockRotation', 'lockScalingX', 'lockScalingY']);\n * @example <caption>JSON without default values</caption>\n * canvas.includeDefaultValues = false;\n * var json = canvas.toJSON();\n */\n fabric.StaticCanvas.prototype.toJSON = fabric.StaticCanvas.prototype.toObject;\n\n if (fabric.isLikelyNode) {\n fabric.StaticCanvas.prototype.createPNGStream = function() {\n var impl = getNodeCanvas(this.lowerCanvasEl);\n return impl && impl.createPNGStream();\n };\n fabric.StaticCanvas.prototype.createJPEGStream = function(opts) {\n var impl = getNodeCanvas(this.lowerCanvasEl);\n return impl && impl.createJPEGStream(opts);\n };\n }\n})();\n\n\n/**\n * BaseBrush class\n * @class fabric.BaseBrush\n * @see {@link http://fabricjs.com/freedrawing|Freedrawing demo}\n */\nfabric.BaseBrush = fabric.util.createClass(/** @lends fabric.BaseBrush.prototype */ {\n\n /**\n * Color of a brush\n * @type String\n * @default\n */\n color: 'rgb(0, 0, 0)',\n\n /**\n * Width of a brush, has to be a Number, no string literals\n * @type Number\n * @default\n */\n width: 1,\n\n /**\n * Shadow object representing shadow of this shape.\n * <b>Backwards incompatibility note:</b> This property replaces \"shadowColor\" (String), \"shadowOffsetX\" (Number),\n * \"shadowOffsetY\" (Number) and \"shadowBlur\" (Number) since v1.2.12\n * @type fabric.Shadow\n * @default\n */\n shadow: null,\n\n /**\n * Line endings style of a brush (one of \"butt\", \"round\", \"square\")\n * @type String\n * @default\n */\n strokeLineCap: 'round',\n\n /**\n * Corner style of a brush (one of \"bevel\", \"round\", \"miter\")\n * @type String\n * @default\n */\n strokeLineJoin: 'round',\n\n /**\n * Maximum miter length (used for strokeLineJoin = \"miter\") of a brush's\n * @type Number\n * @default\n */\n strokeMiterLimit: 10,\n\n /**\n * Stroke Dash Array.\n * @type Array\n * @default\n */\n strokeDashArray: null,\n\n /**\n * Sets brush styles\n * @private\n */\n _setBrushStyles: function() {\n var ctx = this.canvas.contextTop;\n ctx.strokeStyle = this.color;\n ctx.lineWidth = this.width;\n ctx.lineCap = this.strokeLineCap;\n ctx.miterLimit = this.strokeMiterLimit;\n ctx.lineJoin = this.strokeLineJoin;\n if (fabric.StaticCanvas.supports('setLineDash')) {\n ctx.setLineDash(this.strokeDashArray || []);\n }\n },\n\n /**\n * Sets the transformation on given context\n * @param {RenderingContext2d} ctx context to render on\n * @private\n */\n _saveAndTransform: function(ctx) {\n var v = this.canvas.viewportTransform;\n ctx.save();\n ctx.transform(v[0], v[1], v[2], v[3], v[4], v[5]);\n },\n\n /**\n * Sets brush shadow styles\n * @private\n */\n _setShadow: function() {\n if (!this.shadow) {\n return;\n }\n\n var canvas = this.canvas,\n shadow = this.shadow,\n ctx = canvas.contextTop,\n zoom = canvas.getZoom();\n if (canvas && canvas._isRetinaScaling()) {\n zoom *= fabric.devicePixelRatio;\n }\n\n ctx.shadowColor = shadow.color;\n ctx.shadowBlur = shadow.blur * zoom;\n ctx.shadowOffsetX = shadow.offsetX * zoom;\n ctx.shadowOffsetY = shadow.offsetY * zoom;\n },\n\n needsFullRender: function() {\n var color = new fabric.Color(this.color);\n return color.getAlpha() < 1 || !!this.shadow;\n },\n\n /**\n * Removes brush shadow styles\n * @private\n */\n _resetShadow: function() {\n var ctx = this.canvas.contextTop;\n\n ctx.shadowColor = '';\n ctx.shadowBlur = ctx.shadowOffsetX = ctx.shadowOffsetY = 0;\n }\n});\n\n\n(function() {\n /**\n * PencilBrush class\n * @class fabric.PencilBrush\n * @extends fabric.BaseBrush\n */\n fabric.PencilBrush = fabric.util.createClass(fabric.BaseBrush, /** @lends fabric.PencilBrush.prototype */ {\n\n /**\n * Discard points that are less than `decimate` pixel distant from each other\n * @type Number\n * @default 0.4\n */\n decimate: 0.4,\n\n /**\n * Constructor\n * @param {fabric.Canvas} canvas\n * @return {fabric.PencilBrush} Instance of a pencil brush\n */\n initialize: function(canvas) {\n this.canvas = canvas;\n this._points = [];\n },\n\n /**\n * Invoked inside on mouse down and mouse move\n * @param {Object} pointer\n */\n _drawSegment: function (ctx, p1, p2) {\n var midPoint = p1.midPointFrom(p2);\n ctx.quadraticCurveTo(p1.x, p1.y, midPoint.x, midPoint.y);\n return midPoint;\n },\n\n /**\n * Inovoked on mouse down\n * @param {Object} pointer\n */\n onMouseDown: function(pointer, options) {\n if (!this.canvas._isMainEvent(options.e)) {\n return;\n }\n this._prepareForDrawing(pointer);\n // capture coordinates immediately\n // this allows to draw dots (when movement never occurs)\n this._captureDrawingPath(pointer);\n this._render();\n },\n\n /**\n * Inovoked on mouse move\n * @param {Object} pointer\n */\n onMouseMove: function(pointer, options) {\n if (!this.canvas._isMainEvent(options.e)) {\n return;\n }\n if (this._captureDrawingPath(pointer) && this._points.length > 1) {\n if (this.needsFullRender()) {\n // redraw curve\n // clear top canvas\n this.canvas.clearContext(this.canvas.contextTop);\n this._render();\n }\n else {\n var points = this._points, length = points.length, ctx = this.canvas.contextTop;\n // draw the curve update\n this._saveAndTransform(ctx);\n if (this.oldEnd) {\n ctx.beginPath();\n ctx.moveTo(this.oldEnd.x, this.oldEnd.y);\n }\n this.oldEnd = this._drawSegment(ctx, points[length - 2], points[length - 1], true);\n ctx.stroke();\n ctx.restore();\n }\n }\n },\n\n /**\n * Invoked on mouse up\n */\n onMouseUp: function(options) {\n if (!this.canvas._isMainEvent(options.e)) {\n return true;\n }\n this.oldEnd = undefined;\n this._finalizeAndAddPath();\n return false;\n },\n\n /**\n * @private\n * @param {Object} pointer Actual mouse position related to the canvas.\n */\n _prepareForDrawing: function(pointer) {\n\n var p = new fabric.Point(pointer.x, pointer.y);\n\n this._reset();\n this._addPoint(p);\n this.canvas.contextTop.moveTo(p.x, p.y);\n },\n\n /**\n * @private\n * @param {fabric.Point} point Point to be added to points array\n */\n _addPoint: function(point) {\n if (this._points.length > 1 && point.eq(this._points[this._points.length - 1])) {\n return false;\n }\n this._points.push(point);\n return true;\n },\n\n /**\n * Clear points array and set contextTop canvas style.\n * @private\n */\n _reset: function() {\n this._points = [];\n this._setBrushStyles();\n this._setShadow();\n },\n\n /**\n * @private\n * @param {Object} pointer Actual mouse position related to the canvas.\n */\n _captureDrawingPath: function(pointer) {\n var pointerPoint = new fabric.Point(pointer.x, pointer.y);\n return this._addPoint(pointerPoint);\n },\n\n /**\n * Draw a smooth path on the topCanvas using quadraticCurveTo\n * @private\n */\n _render: function() {\n var ctx = this.canvas.contextTop, i, len,\n p1 = this._points[0],\n p2 = this._points[1];\n\n this._saveAndTransform(ctx);\n ctx.beginPath();\n //if we only have 2 points in the path and they are the same\n //it means that the user only clicked the canvas without moving the mouse\n //then we should be drawing a dot. A path isn't drawn between two identical dots\n //that's why we set them apart a bit\n if (this._points.length === 2 && p1.x === p2.x && p1.y === p2.y) {\n var width = this.width / 1000;\n p1 = new fabric.Point(p1.x, p1.y);\n p2 = new fabric.Point(p2.x, p2.y);\n p1.x -= width;\n p2.x += width;\n }\n ctx.moveTo(p1.x, p1.y);\n\n for (i = 1, len = this._points.length; i < len; i++) {\n // we pick the point between pi + 1 & pi + 2 as the\n // end point and p1 as our control point.\n this._drawSegment(ctx, p1, p2);\n p1 = this._points[i];\n p2 = this._points[i + 1];\n }\n // Draw last line as a straight line while\n // we wait for the next point to be able to calculate\n // the bezier control point\n ctx.lineTo(p1.x, p1.y);\n ctx.stroke();\n ctx.restore();\n },\n\n /**\n * Converts points to SVG path\n * @param {Array} points Array of points\n * @return {String} SVG path\n */\n convertPointsToSVGPath: function(points) {\n var path = [], i, width = this.width / 1000,\n p1 = new fabric.Point(points[0].x, points[0].y),\n p2 = new fabric.Point(points[1].x, points[1].y),\n len = points.length, multSignX = 1, multSignY = 0, manyPoints = len > 2;\n\n if (manyPoints) {\n multSignX = points[2].x < p2.x ? -1 : points[2].x === p2.x ? 0 : 1;\n multSignY = points[2].y < p2.y ? -1 : points[2].y === p2.y ? 0 : 1;\n }\n path.push('M ', p1.x - multSignX * width, ' ', p1.y - multSignY * width, ' ');\n for (i = 1; i < len; i++) {\n if (!p1.eq(p2)) {\n var midPoint = p1.midPointFrom(p2);\n // p1 is our bezier control point\n // midpoint is our endpoint\n // start point is p(i-1) value.\n path.push('Q ', p1.x, ' ', p1.y, ' ', midPoint.x, ' ', midPoint.y, ' ');\n }\n p1 = points[i];\n if ((i + 1) < points.length) {\n p2 = points[i + 1];\n }\n }\n if (manyPoints) {\n multSignX = p1.x > points[i - 2].x ? 1 : p1.x === points[i - 2].x ? 0 : -1;\n multSignY = p1.y > points[i - 2].y ? 1 : p1.y === points[i - 2].y ? 0 : -1;\n }\n path.push('L ', p1.x + multSignX * width, ' ', p1.y + multSignY * width);\n return path;\n },\n\n /**\n * Creates fabric.Path object to add on canvas\n * @param {String} pathData Path data\n * @return {fabric.Path} Path to add on canvas\n */\n createPath: function(pathData) {\n var path = new fabric.Path(pathData, {\n fill: null,\n stroke: this.color,\n strokeWidth: this.width,\n strokeLineCap: this.strokeLineCap,\n strokeMiterLimit: this.strokeMiterLimit,\n strokeLineJoin: this.strokeLineJoin,\n strokeDashArray: this.strokeDashArray,\n });\n if (this.shadow) {\n this.shadow.affectStroke = true;\n path.shadow = new fabric.Shadow(this.shadow);\n }\n\n return path;\n },\n\n /**\n * Decimate poins array with the decimate value\n */\n decimatePoints: function(points, distance) {\n if (points.length <= 2) {\n return points;\n }\n var zoom = this.canvas.getZoom(), adjustedDistance = Math.pow(distance / zoom, 2),\n i, l = points.length - 1, lastPoint = points[0], newPoints = [lastPoint],\n cDistance;\n for (i = 1; i < l; i++) {\n cDistance = Math.pow(lastPoint.x - points[i].x, 2) + Math.pow(lastPoint.y - points[i].y, 2);\n if (cDistance >= adjustedDistance) {\n lastPoint = points[i];\n newPoints.push(lastPoint);\n }\n }\n if (newPoints.length === 1) {\n newPoints.push(new fabric.Point(newPoints[0].x, newPoints[0].y));\n }\n return newPoints;\n },\n\n /**\n * On mouseup after drawing the path on contextTop canvas\n * we use the points captured to create an new fabric path object\n * and add it to the fabric canvas.\n */\n _finalizeAndAddPath: function() {\n var ctx = this.canvas.contextTop;\n ctx.closePath();\n if (this.decimate) {\n this._points = this.decimatePoints(this._points, this.decimate);\n }\n var pathData = this.convertPointsToSVGPath(this._points).join('');\n if (pathData === 'M 0 0 Q 0 0 0 0 L 0 0') {\n // do not create 0 width/height paths, as they are\n // rendered inconsistently across browsers\n // Firefox 4, for example, renders a dot,\n // whereas Chrome 10 renders nothing\n this.canvas.requestRenderAll();\n return;\n }\n\n var path = this.createPath(pathData);\n this.canvas.clearContext(this.canvas.contextTop);\n this.canvas.fire('before:path:created', { path: path });\n this.canvas.add(path);\n this.canvas.requestRenderAll();\n path.setCoords();\n this._resetShadow();\n\n\n // fire event 'path' created\n this.canvas.fire('path:created', { path: path });\n }\n });\n})();\n\n\n/**\n * CircleBrush class\n * @class fabric.CircleBrush\n */\nfabric.CircleBrush = fabric.util.createClass(fabric.BaseBrush, /** @lends fabric.CircleBrush.prototype */ {\n\n /**\n * Width of a brush\n * @type Number\n * @default\n */\n width: 10,\n\n /**\n * Constructor\n * @param {fabric.Canvas} canvas\n * @return {fabric.CircleBrush} Instance of a circle brush\n */\n initialize: function(canvas) {\n this.canvas = canvas;\n this.points = [];\n },\n\n /**\n * Invoked inside on mouse down and mouse move\n * @param {Object} pointer\n */\n drawDot: function(pointer) {\n var point = this.addPoint(pointer),\n ctx = this.canvas.contextTop;\n this._saveAndTransform(ctx);\n this.dot(ctx, point);\n ctx.restore();\n },\n\n dot: function(ctx, point) {\n ctx.fillStyle = point.fill;\n ctx.beginPath();\n ctx.arc(point.x, point.y, point.radius, 0, Math.PI * 2, false);\n ctx.closePath();\n ctx.fill();\n },\n\n /**\n * Invoked on mouse down\n */\n onMouseDown: function(pointer) {\n this.points.length = 0;\n this.canvas.clearContext(this.canvas.contextTop);\n this._setShadow();\n this.drawDot(pointer);\n },\n\n /**\n * Render the full state of the brush\n * @private\n */\n _render: function() {\n var ctx = this.canvas.contextTop, i, len,\n points = this.points;\n this._saveAndTransform(ctx);\n for (i = 0, len = points.length; i < len; i++) {\n this.dot(ctx, points[i]);\n }\n ctx.restore();\n },\n\n /**\n * Invoked on mouse move\n * @param {Object} pointer\n */\n onMouseMove: function(pointer) {\n if (this.needsFullRender()) {\n this.canvas.clearContext(this.canvas.contextTop);\n this.addPoint(pointer);\n this._render();\n }\n else {\n this.drawDot(pointer);\n }\n },\n\n /**\n * Invoked on mouse up\n */\n onMouseUp: function() {\n var originalRenderOnAddRemove = this.canvas.renderOnAddRemove, i, len;\n this.canvas.renderOnAddRemove = false;\n\n var circles = [];\n\n for (i = 0, len = this.points.length; i < len; i++) {\n var point = this.points[i],\n circle = new fabric.Circle({\n radius: point.radius,\n left: point.x,\n top: point.y,\n originX: 'center',\n originY: 'center',\n fill: point.fill\n });\n\n this.shadow && (circle.shadow = new fabric.Shadow(this.shadow));\n\n circles.push(circle);\n }\n var group = new fabric.Group(circles);\n group.canvas = this.canvas;\n\n this.canvas.fire('before:path:created', { path: group });\n this.canvas.add(group);\n this.canvas.fire('path:created', { path: group });\n\n this.canvas.clearContext(this.canvas.contextTop);\n this._resetShadow();\n this.canvas.renderOnAddRemove = originalRenderOnAddRemove;\n this.canvas.requestRenderAll();\n },\n\n /**\n * @param {Object} pointer\n * @return {fabric.Point} Just added pointer point\n */\n addPoint: function(pointer) {\n var pointerPoint = new fabric.Point(pointer.x, pointer.y),\n\n circleRadius = fabric.util.getRandomInt(\n Math.max(0, this.width - 20), this.width + 20) / 2,\n\n circleColor = new fabric.Color(this.color)\n .setAlpha(fabric.util.getRandomInt(0, 100) / 100)\n .toRgba();\n\n pointerPoint.radius = circleRadius;\n pointerPoint.fill = circleColor;\n\n this.points.push(pointerPoint);\n\n return pointerPoint;\n }\n});\n\n\n/**\n * SprayBrush class\n * @class fabric.SprayBrush\n */\nfabric.SprayBrush = fabric.util.createClass( fabric.BaseBrush, /** @lends fabric.SprayBrush.prototype */ {\n\n /**\n * Width of a spray\n * @type Number\n * @default\n */\n width: 10,\n\n /**\n * Density of a spray (number of dots per chunk)\n * @type Number\n * @default\n */\n density: 20,\n\n /**\n * Width of spray dots\n * @type Number\n * @default\n */\n dotWidth: 1,\n\n /**\n * Width variance of spray dots\n * @type Number\n * @default\n */\n dotWidthVariance: 1,\n\n /**\n * Whether opacity of a dot should be random\n * @type Boolean\n * @default\n */\n randomOpacity: false,\n\n /**\n * Whether overlapping dots (rectangles) should be removed (for performance reasons)\n * @type Boolean\n * @default\n */\n optimizeOverlapping: true,\n\n /**\n * Constructor\n * @param {fabric.Canvas} canvas\n * @return {fabric.SprayBrush} Instance of a spray brush\n */\n initialize: function(canvas) {\n this.canvas = canvas;\n this.sprayChunks = [];\n },\n\n /**\n * Invoked on mouse down\n * @param {Object} pointer\n */\n onMouseDown: function(pointer) {\n this.sprayChunks.length = 0;\n this.canvas.clearContext(this.canvas.contextTop);\n this._setShadow();\n\n this.addSprayChunk(pointer);\n this.render(this.sprayChunkPoints);\n },\n\n /**\n * Invoked on mouse move\n * @param {Object} pointer\n */\n onMouseMove: function(pointer) {\n this.addSprayChunk(pointer);\n this.render(this.sprayChunkPoints);\n },\n\n /**\n * Invoked on mouse up\n */\n onMouseUp: function() {\n var originalRenderOnAddRemove = this.canvas.renderOnAddRemove;\n this.canvas.renderOnAddRemove = false;\n\n var rects = [];\n\n for (var i = 0, ilen = this.sprayChunks.length; i < ilen; i++) {\n var sprayChunk = this.sprayChunks[i];\n\n for (var j = 0, jlen = sprayChunk.length; j < jlen; j++) {\n\n var rect = new fabric.Rect({\n width: sprayChunk[j].width,\n height: sprayChunk[j].width,\n left: sprayChunk[j].x + 1,\n top: sprayChunk[j].y + 1,\n originX: 'center',\n originY: 'center',\n fill: this.color\n });\n rects.push(rect);\n }\n }\n\n if (this.optimizeOverlapping) {\n rects = this._getOptimizedRects(rects);\n }\n\n var group = new fabric.Group(rects);\n this.shadow && group.set('shadow', new fabric.Shadow(this.shadow));\n this.canvas.fire('before:path:created', { path: group });\n this.canvas.add(group);\n this.canvas.fire('path:created', { path: group });\n\n this.canvas.clearContext(this.canvas.contextTop);\n this._resetShadow();\n this.canvas.renderOnAddRemove = originalRenderOnAddRemove;\n this.canvas.requestRenderAll();\n },\n\n /**\n * @private\n * @param {Array} rects\n */\n _getOptimizedRects: function(rects) {\n\n // avoid creating duplicate rects at the same coordinates\n var uniqueRects = { }, key, i, len;\n\n for (i = 0, len = rects.length; i < len; i++) {\n key = rects[i].left + '' + rects[i].top;\n if (!uniqueRects[key]) {\n uniqueRects[key] = rects[i];\n }\n }\n var uniqueRectsArray = [];\n for (key in uniqueRects) {\n uniqueRectsArray.push(uniqueRects[key]);\n }\n\n return uniqueRectsArray;\n },\n\n /**\n * Render new chunk of spray brush\n */\n render: function(sprayChunk) {\n var ctx = this.canvas.contextTop, i, len;\n ctx.fillStyle = this.color;\n\n this._saveAndTransform(ctx);\n\n for (i = 0, len = sprayChunk.length; i < len; i++) {\n var point = sprayChunk[i];\n if (typeof point.opacity !== 'undefined') {\n ctx.globalAlpha = point.opacity;\n }\n ctx.fillRect(point.x, point.y, point.width, point.width);\n }\n ctx.restore();\n },\n\n /**\n * Render all spray chunks\n */\n _render: function() {\n var ctx = this.canvas.contextTop, i, ilen;\n ctx.fillStyle = this.color;\n\n this._saveAndTransform(ctx);\n\n for (i = 0, ilen = this.sprayChunks.length; i < ilen; i++) {\n this.render(this.sprayChunks[i]);\n }\n ctx.restore();\n },\n\n /**\n * @param {Object} pointer\n */\n addSprayChunk: function(pointer) {\n this.sprayChunkPoints = [];\n\n var x, y, width, radius = this.width / 2, i;\n\n for (i = 0; i < this.density; i++) {\n\n x = fabric.util.getRandomInt(pointer.x - radius, pointer.x + radius);\n y = fabric.util.getRandomInt(pointer.y - radius, pointer.y + radius);\n\n if (this.dotWidthVariance) {\n width = fabric.util.getRandomInt(\n // bottom clamp width to 1\n Math.max(1, this.dotWidth - this.dotWidthVariance),\n this.dotWidth + this.dotWidthVariance);\n }\n else {\n width = this.dotWidth;\n }\n\n var point = new fabric.Point(x, y);\n point.width = width;\n\n if (this.randomOpacity) {\n point.opacity = fabric.util.getRandomInt(0, 100) / 100;\n }\n\n this.sprayChunkPoints.push(point);\n }\n\n this.sprayChunks.push(this.sprayChunkPoints);\n }\n});\n\n\n/**\n * PatternBrush class\n * @class fabric.PatternBrush\n * @extends fabric.BaseBrush\n */\nfabric.PatternBrush = fabric.util.createClass(fabric.PencilBrush, /** @lends fabric.PatternBrush.prototype */ {\n\n getPatternSrc: function() {\n\n var dotWidth = 20,\n dotDistance = 5,\n patternCanvas = fabric.util.createCanvasElement(),\n patternCtx = patternCanvas.getContext('2d');\n\n patternCanvas.width = patternCanvas.height = dotWidth + dotDistance;\n\n patternCtx.fillStyle = this.color;\n patternCtx.beginPath();\n patternCtx.arc(dotWidth / 2, dotWidth / 2, dotWidth / 2, 0, Math.PI * 2, false);\n patternCtx.closePath();\n patternCtx.fill();\n\n return patternCanvas;\n },\n\n getPatternSrcFunction: function() {\n return String(this.getPatternSrc).replace('this.color', '\"' + this.color + '\"');\n },\n\n /**\n * Creates \"pattern\" instance property\n */\n getPattern: function() {\n return this.canvas.contextTop.createPattern(this.source || this.getPatternSrc(), 'repeat');\n },\n\n /**\n * Sets brush styles\n */\n _setBrushStyles: function() {\n this.callSuper('_setBrushStyles');\n this.canvas.contextTop.strokeStyle = this.getPattern();\n },\n\n /**\n * Creates path\n */\n createPath: function(pathData) {\n var path = this.callSuper('createPath', pathData),\n topLeft = path._getLeftTopCoords().scalarAdd(path.strokeWidth / 2);\n\n path.stroke = new fabric.Pattern({\n source: this.source || this.getPatternSrcFunction(),\n offsetX: -topLeft.x,\n offsetY: -topLeft.y\n });\n return path;\n }\n});\n\n\n(function() {\n\n var getPointer = fabric.util.getPointer,\n degreesToRadians = fabric.util.degreesToRadians,\n abs = Math.abs,\n supportLineDash = fabric.StaticCanvas.supports('setLineDash'),\n isTouchEvent = fabric.util.isTouchEvent,\n STROKE_OFFSET = 0.5;\n\n /**\n * Canvas class\n * @class fabric.Canvas\n * @extends fabric.StaticCanvas\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-1#canvas}\n * @see {@link fabric.Canvas#initialize} for constructor definition\n *\n * @fires object:modified at the end of a transform or any change when statefull is true\n * @fires object:rotating while an object is being rotated from the control\n * @fires object:scaling while an object is being scaled by controls\n * @fires object:moving while an object is being dragged\n * @fires object:skewing while an object is being skewed from the controls\n *\n * @fires before:transform before a transform is is started\n * @fires before:selection:cleared\n * @fires selection:cleared\n * @fires selection:updated\n * @fires selection:created\n *\n * @fires path:created after a drawing operation ends and the path is added\n * @fires mouse:down\n * @fires mouse:move\n * @fires mouse:up\n * @fires mouse:down:before on mouse down, before the inner fabric logic runs\n * @fires mouse:move:before on mouse move, before the inner fabric logic runs\n * @fires mouse:up:before on mouse up, before the inner fabric logic runs\n * @fires mouse:over\n * @fires mouse:out\n * @fires mouse:dblclick whenever a native dbl click event fires on the canvas.\n *\n * @fires dragover\n * @fires dragenter\n * @fires dragleave\n * @fires drop\n * @fires after:render at the end of the render process, receives the context in the callback\n * @fires before:render at start the render process, receives the context in the callback\n *\n * the following events are deprecated:\n * @fires object:rotated at the end of a rotation transform\n * @fires object:scaled at the end of a scale transform\n * @fires object:moved at the end of translation transform\n * @fires object:skewed at the end of a skew transform\n */\n fabric.Canvas = fabric.util.createClass(fabric.StaticCanvas, /** @lends fabric.Canvas.prototype */ {\n\n /**\n * Constructor\n * @param {HTMLElement | String} el <canvas> element to initialize instance on\n * @param {Object} [options] Options object\n * @return {Object} thisArg\n */\n initialize: function(el, options) {\n options || (options = { });\n this.renderAndResetBound = this.renderAndReset.bind(this);\n this.requestRenderAllBound = this.requestRenderAll.bind(this);\n this._initStatic(el, options);\n this._initInteractive();\n this._createCacheCanvas();\n },\n\n /**\n * When true, objects can be transformed by one side (unproportionally)\n * when dragged on the corners that normally would not do that.\n * @type Boolean\n * @default\n * @since fabric 4.0 // changed name and default value\n */\n uniformScaling: true,\n\n /**\n * Indicates which key switches uniform scaling.\n * values: 'altKey', 'shiftKey', 'ctrlKey'.\n * If `null` or 'none' or any other string that is not a modifier key\n * feature is disabled.\n * totally wrong named. this sounds like `uniform scaling`\n * if Canvas.uniformScaling is true, pressing this will set it to false\n * and viceversa.\n * @since 1.6.2\n * @type String\n * @default\n */\n uniScaleKey: 'shiftKey',\n\n /**\n * When true, objects use center point as the origin of scale transformation.\n * <b>Backwards incompatibility note:</b> This property replaces \"centerTransform\" (Boolean).\n * @since 1.3.4\n * @type Boolean\n * @default\n */\n centeredScaling: false,\n\n /**\n * When true, objects use center point as the origin of rotate transformation.\n * <b>Backwards incompatibility note:</b> This property replaces \"centerTransform\" (Boolean).\n * @since 1.3.4\n * @type Boolean\n * @default\n */\n centeredRotation: false,\n\n /**\n * Indicates which key enable centered Transform\n * values: 'altKey', 'shiftKey', 'ctrlKey'.\n * If `null` or 'none' or any other string that is not a modifier key\n * feature is disabled feature disabled.\n * @since 1.6.2\n * @type String\n * @default\n */\n centeredKey: 'altKey',\n\n /**\n * Indicates which key enable alternate action on corner\n * values: 'altKey', 'shiftKey', 'ctrlKey'.\n * If `null` or 'none' or any other string that is not a modifier key\n * feature is disabled feature disabled.\n * @since 1.6.2\n * @type String\n * @default\n */\n altActionKey: 'shiftKey',\n\n /**\n * Indicates that canvas is interactive. This property should not be changed.\n * @type Boolean\n * @default\n */\n interactive: true,\n\n /**\n * Indicates whether group selection should be enabled\n * @type Boolean\n * @default\n */\n selection: true,\n\n /**\n * Indicates which key or keys enable multiple click selection\n * Pass value as a string or array of strings\n * values: 'altKey', 'shiftKey', 'ctrlKey'.\n * If `null` or empty or containing any other string that is not a modifier key\n * feature is disabled.\n * @since 1.6.2\n * @type String|Array\n * @default\n */\n selectionKey: 'shiftKey',\n\n /**\n * Indicates which key enable alternative selection\n * in case of target overlapping with active object\n * values: 'altKey', 'shiftKey', 'ctrlKey'.\n * For a series of reason that come from the general expectations on how\n * things should work, this feature works only for preserveObjectStacking true.\n * If `null` or 'none' or any other string that is not a modifier key\n * feature is disabled.\n * @since 1.6.5\n * @type null|String\n * @default\n */\n altSelectionKey: null,\n\n /**\n * Color of selection\n * @type String\n * @default\n */\n selectionColor: 'rgba(100, 100, 255, 0.3)', // blue\n\n /**\n * Default dash array pattern\n * If not empty the selection border is dashed\n * @type Array\n */\n selectionDashArray: [],\n\n /**\n * Color of the border of selection (usually slightly darker than color of selection itself)\n * @type String\n * @default\n */\n selectionBorderColor: 'rgba(255, 255, 255, 0.3)',\n\n /**\n * Width of a line used in object/group selection\n * @type Number\n * @default\n */\n selectionLineWidth: 1,\n\n /**\n * Select only shapes that are fully contained in the dragged selection rectangle.\n * @type Boolean\n * @default\n */\n selectionFullyContained: false,\n\n /**\n * Default cursor value used when hovering over an object on canvas\n * @type String\n * @default\n */\n hoverCursor: 'move',\n\n /**\n * Default cursor value used when moving an object on canvas\n * @type String\n * @default\n */\n moveCursor: 'move',\n\n /**\n * Default cursor value used for the entire canvas\n * @type String\n * @default\n */\n defaultCursor: 'default',\n\n /**\n * Cursor value used during free drawing\n * @type String\n * @default\n */\n freeDrawingCursor: 'crosshair',\n\n /**\n * Cursor value used for rotation point\n * @type String\n * @default\n */\n rotationCursor: 'crosshair',\n\n /**\n * Cursor value used for disabled elements ( corners with disabled action )\n * @type String\n * @since 2.0.0\n * @default\n */\n notAllowedCursor: 'not-allowed',\n\n /**\n * Default element class that's given to wrapper (div) element of canvas\n * @type String\n * @default\n */\n containerClass: 'canvas-container',\n\n /**\n * When true, object detection happens on per-pixel basis rather than on per-bounding-box\n * @type Boolean\n * @default\n */\n perPixelTargetFind: false,\n\n /**\n * Number of pixels around target pixel to tolerate (consider active) during object detection\n * @type Number\n * @default\n */\n targetFindTolerance: 0,\n\n /**\n * When true, target detection is skipped. Target detection will return always undefined.\n * click selection won't work anymore, events will fire with no targets.\n * if something is selected before setting it to true, it will be deselected at the first click.\n * area selection will still work. check the `selection` property too.\n * if you deactivate both, you should look into staticCanvas.\n * @type Boolean\n * @default\n */\n skipTargetFind: false,\n\n /**\n * When true, mouse events on canvas (mousedown/mousemove/mouseup) result in free drawing.\n * After mousedown, mousemove creates a shape,\n * and then mouseup finalizes it and adds an instance of `fabric.Path` onto canvas.\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-4#free_drawing}\n * @type Boolean\n * @default\n */\n isDrawingMode: false,\n\n /**\n * Indicates whether objects should remain in current stack position when selected.\n * When false objects are brought to top and rendered as part of the selection group\n * @type Boolean\n * @default\n */\n preserveObjectStacking: false,\n\n /**\n * Indicates the angle that an object will lock to while rotating.\n * @type Number\n * @since 1.6.7\n * @default\n */\n snapAngle: 0,\n\n /**\n * Indicates the distance from the snapAngle the rotation will lock to the snapAngle.\n * When `null`, the snapThreshold will default to the snapAngle.\n * @type null|Number\n * @since 1.6.7\n * @default\n */\n snapThreshold: null,\n\n /**\n * Indicates if the right click on canvas can output the context menu or not\n * @type Boolean\n * @since 1.6.5\n * @default\n */\n stopContextMenu: false,\n\n /**\n * Indicates if the canvas can fire right click events\n * @type Boolean\n * @since 1.6.5\n * @default\n */\n fireRightClick: false,\n\n /**\n * Indicates if the canvas can fire middle click events\n * @type Boolean\n * @since 1.7.8\n * @default\n */\n fireMiddleClick: false,\n\n /**\n * Keep track of the subTargets for Mouse Events\n * @type fabric.Object[]\n */\n targets: [],\n\n /**\n * Keep track of the hovered target\n * @type fabric.Object\n * @private\n */\n _hoveredTarget: null,\n\n /**\n * hold the list of nested targets hovered\n * @type fabric.Object[]\n * @private\n */\n _hoveredTargets: [],\n\n /**\n * @private\n */\n _initInteractive: function() {\n this._currentTransform = null;\n this._groupSelector = null;\n this._initWrapperElement();\n this._createUpperCanvas();\n this._initEventListeners();\n\n this._initRetinaScaling();\n\n this.freeDrawingBrush = fabric.PencilBrush && new fabric.PencilBrush(this);\n\n this.calcOffset();\n },\n\n /**\n * Divides objects in two groups, one to render immediately\n * and one to render as activeGroup.\n * @return {Array} objects to render immediately and pushes the other in the activeGroup.\n */\n _chooseObjectsToRender: function() {\n var activeObjects = this.getActiveObjects(),\n object, objsToRender, activeGroupObjects;\n\n if (activeObjects.length > 0 && !this.preserveObjectStacking) {\n objsToRender = [];\n activeGroupObjects = [];\n for (var i = 0, length = this._objects.length; i < length; i++) {\n object = this._objects[i];\n if (activeObjects.indexOf(object) === -1 ) {\n objsToRender.push(object);\n }\n else {\n activeGroupObjects.push(object);\n }\n }\n if (activeObjects.length > 1) {\n this._activeObject._objects = activeGroupObjects;\n }\n objsToRender.push.apply(objsToRender, activeGroupObjects);\n }\n else {\n objsToRender = this._objects;\n }\n return objsToRender;\n },\n\n /**\n * Renders both the top canvas and the secondary container canvas.\n * @return {fabric.Canvas} instance\n * @chainable\n */\n renderAll: function () {\n if (this.contextTopDirty && !this._groupSelector && !this.isDrawingMode) {\n this.clearContext(this.contextTop);\n this.contextTopDirty = false;\n }\n if (this.hasLostContext) {\n this.renderTopLayer(this.contextTop);\n }\n var canvasToDrawOn = this.contextContainer;\n this.renderCanvas(canvasToDrawOn, this._chooseObjectsToRender());\n return this;\n },\n\n renderTopLayer: function(ctx) {\n ctx.save();\n if (this.isDrawingMode && this._isCurrentlyDrawing) {\n this.freeDrawingBrush && this.freeDrawingBrush._render();\n this.contextTopDirty = true;\n }\n // we render the top context - last object\n if (this.selection && this._groupSelector) {\n this._drawSelection(ctx);\n this.contextTopDirty = true;\n }\n ctx.restore();\n },\n\n /**\n * Method to render only the top canvas.\n * Also used to render the group selection box.\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n renderTop: function () {\n var ctx = this.contextTop;\n this.clearContext(ctx);\n this.renderTopLayer(ctx);\n this.fire('after:render');\n return this;\n },\n\n /**\n * @private\n */\n _normalizePointer: function (object, pointer) {\n var m = object.calcTransformMatrix(),\n invertedM = fabric.util.invertTransform(m),\n vptPointer = this.restorePointerVpt(pointer);\n return fabric.util.transformPoint(vptPointer, invertedM);\n },\n\n /**\n * Returns true if object is transparent at a certain location\n * @param {fabric.Object} target Object to check\n * @param {Number} x Left coordinate\n * @param {Number} y Top coordinate\n * @return {Boolean}\n */\n isTargetTransparent: function (target, x, y) {\n // in case the target is the activeObject, we cannot execute this optimization\n // because we need to draw controls too.\n if (target.shouldCache() && target._cacheCanvas && target !== this._activeObject) {\n var normalizedPointer = this._normalizePointer(target, {x: x, y: y}),\n targetRelativeX = Math.max(target.cacheTranslationX + (normalizedPointer.x * target.zoomX), 0),\n targetRelativeY = Math.max(target.cacheTranslationY + (normalizedPointer.y * target.zoomY), 0);\n\n var isTransparent = fabric.util.isTransparent(\n target._cacheContext, Math.round(targetRelativeX), Math.round(targetRelativeY), this.targetFindTolerance);\n\n return isTransparent;\n }\n\n var ctx = this.contextCache,\n originalColor = target.selectionBackgroundColor, v = this.viewportTransform;\n\n target.selectionBackgroundColor = '';\n\n this.clearContext(ctx);\n\n ctx.save();\n ctx.transform(v[0], v[1], v[2], v[3], v[4], v[5]);\n target.render(ctx);\n ctx.restore();\n\n target === this._activeObject && target._renderControls(ctx, {\n hasBorders: false,\n transparentCorners: false\n }, {\n hasBorders: false,\n });\n\n target.selectionBackgroundColor = originalColor;\n\n var isTransparent = fabric.util.isTransparent(\n ctx, x, y, this.targetFindTolerance);\n\n return isTransparent;\n },\n\n /**\n * takes an event and determins if selection key has been pressed\n * @private\n * @param {Event} e Event object\n */\n _isSelectionKeyPressed: function(e) {\n var selectionKeyPressed = false;\n\n if (Object.prototype.toString.call(this.selectionKey) === '[object Array]') {\n selectionKeyPressed = !!this.selectionKey.find(function(key) { return e[key] === true; });\n }\n else {\n selectionKeyPressed = e[this.selectionKey];\n }\n\n return selectionKeyPressed;\n },\n\n /**\n * @private\n * @param {Event} e Event object\n * @param {fabric.Object} target\n */\n _shouldClearSelection: function (e, target) {\n var activeObjects = this.getActiveObjects(),\n activeObject = this._activeObject;\n\n return (\n !target\n ||\n (target &&\n activeObject &&\n activeObjects.length > 1 &&\n activeObjects.indexOf(target) === -1 &&\n activeObject !== target &&\n !this._isSelectionKeyPressed(e))\n ||\n (target && !target.evented)\n ||\n (target &&\n !target.selectable &&\n activeObject &&\n activeObject !== target)\n );\n },\n\n /**\n * centeredScaling from object can't override centeredScaling from canvas.\n * this should be fixed, since object setting should take precedence over canvas.\n * also this should be something that will be migrated in the control properties.\n * as ability to define the origin of the transformation that the control provide.\n * @private\n * @param {fabric.Object} target\n * @param {String} action\n * @param {Boolean} altKey\n */\n _shouldCenterTransform: function (target, action, altKey) {\n if (!target) {\n return;\n }\n\n var centerTransform;\n\n if (action === 'scale' || action === 'scaleX' || action === 'scaleY' || action === 'resizing') {\n centerTransform = this.centeredScaling || target.centeredScaling;\n }\n else if (action === 'rotate') {\n centerTransform = this.centeredRotation || target.centeredRotation;\n }\n\n return centerTransform ? !altKey : altKey;\n },\n\n /**\n * should disappear before release 4.0\n * @private\n */\n _getOriginFromCorner: function(target, corner) {\n var origin = {\n x: target.originX,\n y: target.originY\n };\n\n if (corner === 'ml' || corner === 'tl' || corner === 'bl') {\n origin.x = 'right';\n }\n else if (corner === 'mr' || corner === 'tr' || corner === 'br') {\n origin.x = 'left';\n }\n\n if (corner === 'tl' || corner === 'mt' || corner === 'tr') {\n origin.y = 'bottom';\n }\n else if (corner === 'bl' || corner === 'mb' || corner === 'br') {\n origin.y = 'top';\n }\n else if (corner === 'mtr') {\n origin.x = 'center';\n origin.y = 'center';\n }\n return origin;\n },\n\n /**\n * @private\n * @param {Boolean} alreadySelected true if target is already selected\n * @param {String} corner a string representing the corner ml, mr, tl ...\n * @param {Event} e Event object\n * @param {fabric.Object} [target] inserted back to help overriding. Unused\n */\n _getActionFromCorner: function(alreadySelected, corner, e, target) {\n if (!corner || !alreadySelected) {\n return 'drag';\n }\n var control = target.controls[corner];\n return control.getActionName(e, control, target);\n },\n\n /**\n * @private\n * @param {Event} e Event object\n * @param {fabric.Object} target\n */\n _setupCurrentTransform: function (e, target, alreadySelected) {\n if (!target) {\n return;\n }\n\n var pointer = this.getPointer(e), corner = target.__corner,\n actionHandler = (alreadySelected && corner) ?\n target.controls[corner].getActionHandler() : fabric.controlsUtils.dragHandler,\n action = this._getActionFromCorner(alreadySelected, corner, e, target),\n origin = this._getOriginFromCorner(target, corner),\n altKey = e[this.centeredKey],\n transform = {\n target: target,\n action: action,\n actionHandler: actionHandler,\n corner: corner,\n scaleX: target.scaleX,\n scaleY: target.scaleY,\n skewX: target.skewX,\n skewY: target.skewY,\n // used by transation\n offsetX: pointer.x - target.left,\n offsetY: pointer.y - target.top,\n originX: origin.x,\n originY: origin.y,\n ex: pointer.x,\n ey: pointer.y,\n lastX: pointer.x,\n lastY: pointer.y,\n // unsure they are useful anymore.\n // left: target.left,\n // top: target.top,\n theta: degreesToRadians(target.angle),\n // end of unsure\n width: target.width * target.scaleX,\n shiftKey: e.shiftKey,\n altKey: altKey,\n original: fabric.util.saveObjectTransform(target),\n };\n\n if (this._shouldCenterTransform(target, action, altKey)) {\n transform.originX = 'center';\n transform.originY = 'center';\n }\n transform.original.originX = origin.x;\n transform.original.originY = origin.y;\n this._currentTransform = transform;\n this._beforeTransform(e);\n },\n\n /**\n * Set the cursor type of the canvas element\n * @param {String} value Cursor type of the canvas element.\n * @see http://www.w3.org/TR/css3-ui/#cursor\n */\n setCursor: function (value) {\n this.upperCanvasEl.style.cursor = value;\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx to draw the selection on\n */\n _drawSelection: function (ctx) {\n var groupSelector = this._groupSelector,\n left = groupSelector.left,\n top = groupSelector.top,\n aleft = abs(left),\n atop = abs(top);\n\n if (this.selectionColor) {\n ctx.fillStyle = this.selectionColor;\n\n ctx.fillRect(\n groupSelector.ex - ((left > 0) ? 0 : -left),\n groupSelector.ey - ((top > 0) ? 0 : -top),\n aleft,\n atop\n );\n }\n\n if (!this.selectionLineWidth || !this.selectionBorderColor) {\n return;\n }\n ctx.lineWidth = this.selectionLineWidth;\n ctx.strokeStyle = this.selectionBorderColor;\n\n // selection border\n if (this.selectionDashArray.length > 1 && !supportLineDash) {\n\n var px = groupSelector.ex + STROKE_OFFSET - ((left > 0) ? 0 : aleft),\n py = groupSelector.ey + STROKE_OFFSET - ((top > 0) ? 0 : atop);\n\n ctx.beginPath();\n\n fabric.util.drawDashedLine(ctx, px, py, px + aleft, py, this.selectionDashArray);\n fabric.util.drawDashedLine(ctx, px, py + atop - 1, px + aleft, py + atop - 1, this.selectionDashArray);\n fabric.util.drawDashedLine(ctx, px, py, px, py + atop, this.selectionDashArray);\n fabric.util.drawDashedLine(ctx, px + aleft - 1, py, px + aleft - 1, py + atop, this.selectionDashArray);\n\n ctx.closePath();\n ctx.stroke();\n }\n else {\n fabric.Object.prototype._setLineDash.call(this, ctx, this.selectionDashArray);\n ctx.strokeRect(\n groupSelector.ex + STROKE_OFFSET - ((left > 0) ? 0 : aleft),\n groupSelector.ey + STROKE_OFFSET - ((top > 0) ? 0 : atop),\n aleft,\n atop\n );\n }\n },\n\n /**\n * Method that determines what object we are clicking on\n * the skipGroup parameter is for internal use, is needed for shift+click action\n * 11/09/2018 TODO: would be cool if findTarget could discern between being a full target\n * or the outside part of the corner.\n * @param {Event} e mouse event\n * @param {Boolean} skipGroup when true, activeGroup is skipped and only objects are traversed through\n * @return {fabric.Object} the target found\n */\n findTarget: function (e, skipGroup) {\n if (this.skipTargetFind) {\n return;\n }\n\n var ignoreZoom = true,\n pointer = this.getPointer(e, ignoreZoom),\n activeObject = this._activeObject,\n aObjects = this.getActiveObjects(),\n activeTarget, activeTargetSubs,\n isTouch = isTouchEvent(e);\n\n // first check current group (if one exists)\n // active group does not check sub targets like normal groups.\n // if active group just exits.\n this.targets = [];\n\n if (aObjects.length > 1 && !skipGroup && activeObject === this._searchPossibleTargets([activeObject], pointer)) {\n return activeObject;\n }\n // if we hit the corner of an activeObject, let's return that.\n if (aObjects.length === 1 && activeObject._findTargetCorner(pointer, isTouch)) {\n return activeObject;\n }\n if (aObjects.length === 1 &&\n activeObject === this._searchPossibleTargets([activeObject], pointer)) {\n if (!this.preserveObjectStacking) {\n return activeObject;\n }\n else {\n activeTarget = activeObject;\n activeTargetSubs = this.targets;\n this.targets = [];\n }\n }\n var target = this._searchPossibleTargets(this._objects, pointer);\n if (e[this.altSelectionKey] && target && activeTarget && target !== activeTarget) {\n target = activeTarget;\n this.targets = activeTargetSubs;\n }\n return target;\n },\n\n /**\n * Checks point is inside the object.\n * @param {Object} [pointer] x,y object of point coordinates we want to check.\n * @param {fabric.Object} obj Object to test against\n * @param {Object} [globalPointer] x,y object of point coordinates relative to canvas used to search per pixel target.\n * @return {Boolean} true if point is contained within an area of given object\n * @private\n */\n _checkTarget: function(pointer, obj, globalPointer) {\n if (obj &&\n obj.visible &&\n obj.evented &&\n // http://www.geog.ubc.ca/courses/klink/gis.notes/ncgia/u32.html\n // http://idav.ucdavis.edu/~okreylos/TAship/Spring2000/PointInPolygon.html\n (obj.containsPoint(pointer) || !!obj._findTargetCorner(pointer))\n ) {\n if ((this.perPixelTargetFind || obj.perPixelTargetFind) && !obj.isEditing) {\n var isTransparent = this.isTargetTransparent(obj, globalPointer.x, globalPointer.y);\n if (!isTransparent) {\n return true;\n }\n }\n else {\n return true;\n }\n }\n },\n\n /**\n * Function used to search inside objects an object that contains pointer in bounding box or that contains pointerOnCanvas when painted\n * @param {Array} [objects] objects array to look into\n * @param {Object} [pointer] x,y object of point coordinates we want to check.\n * @return {fabric.Object} object that contains pointer\n * @private\n */\n _searchPossibleTargets: function(objects, pointer) {\n // Cache all targets where their bounding box contains point.\n var target, i = objects.length, subTarget;\n // Do not check for currently grouped objects, since we check the parent group itself.\n // until we call this function specifically to search inside the activeGroup\n while (i--) {\n var objToCheck = objects[i];\n var pointerToUse = objToCheck.group ?\n this._normalizePointer(objToCheck.group, pointer) : pointer;\n if (this._checkTarget(pointerToUse, objToCheck, pointer)) {\n target = objects[i];\n if (target.subTargetCheck && target instanceof fabric.Group) {\n subTarget = this._searchPossibleTargets(target._objects, pointer);\n subTarget && this.targets.push(subTarget);\n }\n break;\n }\n }\n return target;\n },\n\n /**\n * Returns pointer coordinates without the effect of the viewport\n * @param {Object} pointer with \"x\" and \"y\" number values\n * @return {Object} object with \"x\" and \"y\" number values\n */\n restorePointerVpt: function(pointer) {\n return fabric.util.transformPoint(\n pointer,\n fabric.util.invertTransform(this.viewportTransform)\n );\n },\n\n /**\n * Returns pointer coordinates relative to canvas.\n * Can return coordinates with or without viewportTransform.\n * ignoreZoom false gives back coordinates that represent\n * the point clicked on canvas element.\n * ignoreZoom true gives back coordinates after being processed\n * by the viewportTransform ( sort of coordinates of what is displayed\n * on the canvas where you are clicking.\n * ignoreZoom true = HTMLElement coordinates relative to top,left\n * ignoreZoom false, default = fabric space coordinates, the same used for shape position\n * To interact with your shapes top and left you want to use ignoreZoom true\n * most of the time, while ignoreZoom false will give you coordinates\n * compatible with the object.oCoords system.\n * of the time.\n * @param {Event} e\n * @param {Boolean} ignoreZoom\n * @return {Object} object with \"x\" and \"y\" number values\n */\n getPointer: function (e, ignoreZoom) {\n // return cached values if we are in the event processing chain\n if (this._absolutePointer && !ignoreZoom) {\n return this._absolutePointer;\n }\n if (this._pointer && ignoreZoom) {\n return this._pointer;\n }\n\n var pointer = getPointer(e),\n upperCanvasEl = this.upperCanvasEl,\n bounds = upperCanvasEl.getBoundingClientRect(),\n boundsWidth = bounds.width || 0,\n boundsHeight = bounds.height || 0,\n cssScale;\n\n if (!boundsWidth || !boundsHeight ) {\n if ('top' in bounds && 'bottom' in bounds) {\n boundsHeight = Math.abs( bounds.top - bounds.bottom );\n }\n if ('right' in bounds && 'left' in bounds) {\n boundsWidth = Math.abs( bounds.right - bounds.left );\n }\n }\n\n this.calcOffset();\n pointer.x = pointer.x - this._offset.left;\n pointer.y = pointer.y - this._offset.top;\n if (!ignoreZoom) {\n pointer = this.restorePointerVpt(pointer);\n }\n\n var retinaScaling = this.getRetinaScaling();\n if (retinaScaling !== 1) {\n pointer.x /= retinaScaling;\n pointer.y /= retinaScaling;\n }\n\n if (boundsWidth === 0 || boundsHeight === 0) {\n // If bounds are not available (i.e. not visible), do not apply scale.\n cssScale = { width: 1, height: 1 };\n }\n else {\n cssScale = {\n width: upperCanvasEl.width / boundsWidth,\n height: upperCanvasEl.height / boundsHeight\n };\n }\n\n return {\n x: pointer.x * cssScale.width,\n y: pointer.y * cssScale.height\n };\n },\n\n /**\n * @private\n * @throws {CANVAS_INIT_ERROR} If canvas can not be initialized\n */\n _createUpperCanvas: function () {\n var lowerCanvasClass = this.lowerCanvasEl.className.replace(/\\s*lower-canvas\\s*/, ''),\n lowerCanvasEl = this.lowerCanvasEl, upperCanvasEl = this.upperCanvasEl;\n\n // there is no need to create a new upperCanvas element if we have already one.\n if (upperCanvasEl) {\n upperCanvasEl.className = '';\n }\n else {\n upperCanvasEl = this._createCanvasElement();\n this.upperCanvasEl = upperCanvasEl;\n }\n fabric.util.addClass(upperCanvasEl, 'upper-canvas ' + lowerCanvasClass);\n\n this.wrapperEl.appendChild(upperCanvasEl);\n\n this._copyCanvasStyle(lowerCanvasEl, upperCanvasEl);\n this._applyCanvasStyle(upperCanvasEl);\n this.contextTop = upperCanvasEl.getContext('2d');\n },\n\n /**\n * @private\n */\n _createCacheCanvas: function () {\n this.cacheCanvasEl = this._createCanvasElement();\n this.cacheCanvasEl.setAttribute('width', this.width);\n this.cacheCanvasEl.setAttribute('height', this.height);\n this.contextCache = this.cacheCanvasEl.getContext('2d');\n },\n\n /**\n * @private\n */\n _initWrapperElement: function () {\n this.wrapperEl = fabric.util.wrapElement(this.lowerCanvasEl, 'div', {\n 'class': this.containerClass\n });\n fabric.util.setStyle(this.wrapperEl, {\n width: this.width + 'px',\n height: this.height + 'px',\n position: 'relative'\n });\n fabric.util.makeElementUnselectable(this.wrapperEl);\n },\n\n /**\n * @private\n * @param {HTMLElement} element canvas element to apply styles on\n */\n _applyCanvasStyle: function (element) {\n var width = this.width || element.width,\n height = this.height || element.height;\n\n fabric.util.setStyle(element, {\n position: 'absolute',\n width: width + 'px',\n height: height + 'px',\n left: 0,\n top: 0,\n 'touch-action': this.allowTouchScrolling ? 'manipulation' : 'none',\n '-ms-touch-action': this.allowTouchScrolling ? 'manipulation' : 'none'\n });\n element.width = width;\n element.height = height;\n fabric.util.makeElementUnselectable(element);\n },\n\n /**\n * Copy the entire inline style from one element (fromEl) to another (toEl)\n * @private\n * @param {Element} fromEl Element style is copied from\n * @param {Element} toEl Element copied style is applied to\n */\n _copyCanvasStyle: function (fromEl, toEl) {\n toEl.style.cssText = fromEl.style.cssText;\n },\n\n /**\n * Returns context of canvas where object selection is drawn\n * @return {CanvasRenderingContext2D}\n */\n getSelectionContext: function() {\n return this.contextTop;\n },\n\n /**\n * Returns <canvas> element on which object selection is drawn\n * @return {HTMLCanvasElement}\n */\n getSelectionElement: function () {\n return this.upperCanvasEl;\n },\n\n /**\n * Returns currently active object\n * @return {fabric.Object} active object\n */\n getActiveObject: function () {\n return this._activeObject;\n },\n\n /**\n * Returns an array with the current selected objects\n * @return {fabric.Object} active object\n */\n getActiveObjects: function () {\n var active = this._activeObject;\n if (active) {\n if (active.type === 'activeSelection' && active._objects) {\n return active._objects.slice(0);\n }\n else {\n return [active];\n }\n }\n return [];\n },\n\n /**\n * @private\n * @param {fabric.Object} obj Object that was removed\n */\n _onObjectRemoved: function(obj) {\n // removing active object should fire \"selection:cleared\" events\n if (obj === this._activeObject) {\n this.fire('before:selection:cleared', { target: obj });\n this._discardActiveObject();\n this.fire('selection:cleared', { target: obj });\n obj.fire('deselected');\n }\n if (obj === this._hoveredTarget){\n this._hoveredTarget = null;\n this._hoveredTargets = [];\n }\n this.callSuper('_onObjectRemoved', obj);\n },\n\n /**\n * @private\n * Compares the old activeObject with the current one and fires correct events\n * @param {fabric.Object} obj old activeObject\n */\n _fireSelectionEvents: function(oldObjects, e) {\n var somethingChanged = false, objects = this.getActiveObjects(),\n added = [], removed = [], opt = { e: e };\n oldObjects.forEach(function(oldObject) {\n if (objects.indexOf(oldObject) === -1) {\n somethingChanged = true;\n oldObject.fire('deselected', opt);\n removed.push(oldObject);\n }\n });\n objects.forEach(function(object) {\n if (oldObjects.indexOf(object) === -1) {\n somethingChanged = true;\n object.fire('selected', opt);\n added.push(object);\n }\n });\n if (oldObjects.length > 0 && objects.length > 0) {\n opt.selected = added;\n opt.deselected = removed;\n // added for backward compatibility\n opt.updated = added[0] || removed[0];\n opt.target = this._activeObject;\n somethingChanged && this.fire('selection:updated', opt);\n }\n else if (objects.length > 0) {\n opt.selected = added;\n // added for backward compatibility\n opt.target = this._activeObject;\n this.fire('selection:created', opt);\n }\n else if (oldObjects.length > 0) {\n opt.deselected = removed;\n this.fire('selection:cleared', opt);\n }\n },\n\n /**\n * Sets given object as the only active object on canvas\n * @param {fabric.Object} object Object to set as an active one\n * @param {Event} [e] Event (passed along when firing \"object:selected\")\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n setActiveObject: function (object, e) {\n var currentActives = this.getActiveObjects();\n this._setActiveObject(object, e);\n this._fireSelectionEvents(currentActives, e);\n return this;\n },\n\n /**\n * @private\n * @param {Object} object to set as active\n * @param {Event} [e] Event (passed along when firing \"object:selected\")\n * @return {Boolean} true if the selection happened\n */\n _setActiveObject: function(object, e) {\n if (this._activeObject === object) {\n return false;\n }\n if (!this._discardActiveObject(e, object)) {\n return false;\n }\n if (object.onSelect({ e: e })) {\n return false;\n }\n this._activeObject = object;\n return true;\n },\n\n /**\n * @private\n */\n _discardActiveObject: function(e, object) {\n var obj = this._activeObject;\n if (obj) {\n // onDeselect return TRUE to cancel selection;\n if (obj.onDeselect({ e: e, object: object })) {\n return false;\n }\n this._activeObject = null;\n }\n return true;\n },\n\n /**\n * Discards currently active object and fire events. If the function is called by fabric\n * as a consequence of a mouse event, the event is passed as a parameter and\n * sent to the fire function for the custom events. When used as a method the\n * e param does not have any application.\n * @param {event} e\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n discardActiveObject: function (e) {\n var currentActives = this.getActiveObjects(), activeObject = this.getActiveObject();\n if (currentActives.length) {\n this.fire('before:selection:cleared', { target: activeObject, e: e });\n }\n this._discardActiveObject(e);\n this._fireSelectionEvents(currentActives, e);\n return this;\n },\n\n /**\n * Clears a canvas element and removes all event listeners\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n dispose: function () {\n var wrapper = this.wrapperEl;\n this.removeListeners();\n wrapper.removeChild(this.upperCanvasEl);\n wrapper.removeChild(this.lowerCanvasEl);\n this.contextCache = null;\n this.contextTop = null;\n ['upperCanvasEl', 'cacheCanvasEl'].forEach((function(element) {\n fabric.util.cleanUpJsdomNode(this[element]);\n this[element] = undefined;\n }).bind(this));\n if (wrapper.parentNode) {\n wrapper.parentNode.replaceChild(this.lowerCanvasEl, this.wrapperEl);\n }\n delete this.wrapperEl;\n fabric.StaticCanvas.prototype.dispose.call(this);\n return this;\n },\n\n /**\n * Clears all contexts (background, main, top) of an instance\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n clear: function () {\n // this.discardActiveGroup();\n this.discardActiveObject();\n this.clearContext(this.contextTop);\n return this.callSuper('clear');\n },\n\n /**\n * Draws objects' controls (borders/controls)\n * @param {CanvasRenderingContext2D} ctx Context to render controls on\n */\n drawControls: function(ctx) {\n var activeObject = this._activeObject;\n\n if (activeObject) {\n activeObject._renderControls(ctx);\n }\n },\n\n /**\n * @private\n */\n _toObject: function(instance, methodName, propertiesToInclude) {\n //If the object is part of the current selection group, it should\n //be transformed appropriately\n //i.e. it should be serialised as it would appear if the selection group\n //were to be destroyed.\n var originalProperties = this._realizeGroupTransformOnObject(instance),\n object = this.callSuper('_toObject', instance, methodName, propertiesToInclude);\n //Undo the damage we did by changing all of its properties\n this._unwindGroupTransformOnObject(instance, originalProperties);\n return object;\n },\n\n /**\n * Realises an object's group transformation on it\n * @private\n * @param {fabric.Object} [instance] the object to transform (gets mutated)\n * @returns the original values of instance which were changed\n */\n _realizeGroupTransformOnObject: function(instance) {\n if (instance.group && instance.group.type === 'activeSelection' && this._activeObject === instance.group) {\n var layoutProps = ['angle', 'flipX', 'flipY', 'left', 'scaleX', 'scaleY', 'skewX', 'skewY', 'top'];\n //Copy all the positionally relevant properties across now\n var originalValues = {};\n layoutProps.forEach(function(prop) {\n originalValues[prop] = instance[prop];\n });\n this._activeObject.realizeTransform(instance);\n return originalValues;\n }\n else {\n return null;\n }\n },\n\n /**\n * Restores the changed properties of instance\n * @private\n * @param {fabric.Object} [instance] the object to un-transform (gets mutated)\n * @param {Object} [originalValues] the original values of instance, as returned by _realizeGroupTransformOnObject\n */\n _unwindGroupTransformOnObject: function(instance, originalValues) {\n if (originalValues) {\n instance.set(originalValues);\n }\n },\n\n /**\n * @private\n */\n _setSVGObject: function(markup, instance, reviver) {\n //If the object is in a selection group, simulate what would happen to that\n //object when the group is deselected\n var originalProperties = this._realizeGroupTransformOnObject(instance);\n this.callSuper('_setSVGObject', markup, instance, reviver);\n this._unwindGroupTransformOnObject(instance, originalProperties);\n },\n\n setViewportTransform: function (vpt) {\n if (this.renderOnAddRemove && this._activeObject && this._activeObject.isEditing) {\n this._activeObject.clearContextTop();\n }\n fabric.StaticCanvas.prototype.setViewportTransform.call(this, vpt);\n }\n });\n\n // copying static properties manually to work around Opera's bug,\n // where \"prototype\" property is enumerable and overrides existing prototype\n for (var prop in fabric.StaticCanvas) {\n if (prop !== 'prototype') {\n fabric.Canvas[prop] = fabric.StaticCanvas[prop];\n }\n }\n})();\n\n\n(function() {\n\n var addListener = fabric.util.addListener,\n removeListener = fabric.util.removeListener,\n RIGHT_CLICK = 3, MIDDLE_CLICK = 2, LEFT_CLICK = 1,\n addEventOptions = { passive: false };\n\n function checkClick(e, value) {\n return e.button && (e.button === value - 1);\n }\n\n fabric.util.object.extend(fabric.Canvas.prototype, /** @lends fabric.Canvas.prototype */ {\n\n /**\n * Contains the id of the touch event that owns the fabric transform\n * @type Number\n * @private\n */\n mainTouchId: null,\n\n /**\n * Adds mouse listeners to canvas\n * @private\n */\n _initEventListeners: function () {\n // in case we initialized the class twice. This should not happen normally\n // but in some kind of applications where the canvas element may be changed\n // this is a workaround to having double listeners.\n this.removeListeners();\n this._bindEvents();\n this.addOrRemove(addListener, 'add');\n },\n\n /**\n * return an event prefix pointer or mouse.\n * @private\n */\n _getEventPrefix: function () {\n return this.enablePointerEvents ? 'pointer' : 'mouse';\n },\n\n addOrRemove: function(functor, eventjsFunctor) {\n var canvasElement = this.upperCanvasEl,\n eventTypePrefix = this._getEventPrefix();\n functor(fabric.window, 'resize', this._onResize);\n functor(canvasElement, eventTypePrefix + 'down', this._onMouseDown);\n functor(canvasElement, eventTypePrefix + 'move', this._onMouseMove, addEventOptions);\n functor(canvasElement, eventTypePrefix + 'out', this._onMouseOut);\n functor(canvasElement, eventTypePrefix + 'enter', this._onMouseEnter);\n functor(canvasElement, 'wheel', this._onMouseWheel);\n functor(canvasElement, 'contextmenu', this._onContextMenu);\n functor(canvasElement, 'dblclick', this._onDoubleClick);\n functor(canvasElement, 'dragover', this._onDragOver);\n functor(canvasElement, 'dragenter', this._onDragEnter);\n functor(canvasElement, 'dragleave', this._onDragLeave);\n functor(canvasElement, 'drop', this._onDrop);\n if (!this.enablePointerEvents) {\n functor(canvasElement, 'touchstart', this._onTouchStart, addEventOptions);\n }\n if (typeof eventjs !== 'undefined' && eventjsFunctor in eventjs) {\n eventjs[eventjsFunctor](canvasElement, 'gesture', this._onGesture);\n eventjs[eventjsFunctor](canvasElement, 'drag', this._onDrag);\n eventjs[eventjsFunctor](canvasElement, 'orientation', this._onOrientationChange);\n eventjs[eventjsFunctor](canvasElement, 'shake', this._onShake);\n eventjs[eventjsFunctor](canvasElement, 'longpress', this._onLongPress);\n }\n },\n\n /**\n * Removes all event listeners\n */\n removeListeners: function() {\n this.addOrRemove(removeListener, 'remove');\n // if you dispose on a mouseDown, before mouse up, you need to clean document to...\n var eventTypePrefix = this._getEventPrefix();\n removeListener(fabric.document, eventTypePrefix + 'up', this._onMouseUp);\n removeListener(fabric.document, 'touchend', this._onTouchEnd, addEventOptions);\n removeListener(fabric.document, eventTypePrefix + 'move', this._onMouseMove, addEventOptions);\n removeListener(fabric.document, 'touchmove', this._onMouseMove, addEventOptions);\n },\n\n /**\n * @private\n */\n _bindEvents: function() {\n if (this.eventsBound) {\n // for any reason we pass here twice we do not want to bind events twice.\n return;\n }\n this._onMouseDown = this._onMouseDown.bind(this);\n this._onTouchStart = this._onTouchStart.bind(this);\n this._onMouseMove = this._onMouseMove.bind(this);\n this._onMouseUp = this._onMouseUp.bind(this);\n this._onTouchEnd = this._onTouchEnd.bind(this);\n this._onResize = this._onResize.bind(this);\n this._onGesture = this._onGesture.bind(this);\n this._onDrag = this._onDrag.bind(this);\n this._onShake = this._onShake.bind(this);\n this._onLongPress = this._onLongPress.bind(this);\n this._onOrientationChange = this._onOrientationChange.bind(this);\n this._onMouseWheel = this._onMouseWheel.bind(this);\n this._onMouseOut = this._onMouseOut.bind(this);\n this._onMouseEnter = this._onMouseEnter.bind(this);\n this._onContextMenu = this._onContextMenu.bind(this);\n this._onDoubleClick = this._onDoubleClick.bind(this);\n this._onDragOver = this._onDragOver.bind(this);\n this._onDragEnter = this._simpleEventHandler.bind(this, 'dragenter');\n this._onDragLeave = this._simpleEventHandler.bind(this, 'dragleave');\n this._onDrop = this._simpleEventHandler.bind(this, 'drop');\n this.eventsBound = true;\n },\n\n /**\n * @private\n * @param {Event} [e] Event object fired on Event.js gesture\n * @param {Event} [self] Inner Event object\n */\n _onGesture: function(e, self) {\n this.__onTransformGesture && this.__onTransformGesture(e, self);\n },\n\n /**\n * @private\n * @param {Event} [e] Event object fired on Event.js drag\n * @param {Event} [self] Inner Event object\n */\n _onDrag: function(e, self) {\n this.__onDrag && this.__onDrag(e, self);\n },\n\n /**\n * @private\n * @param {Event} [e] Event object fired on wheel event\n */\n _onMouseWheel: function(e) {\n this.__onMouseWheel(e);\n },\n\n /**\n * @private\n * @param {Event} e Event object fired on mousedown\n */\n _onMouseOut: function(e) {\n var target = this._hoveredTarget;\n this.fire('mouse:out', { target: target, e: e });\n this._hoveredTarget = null;\n target && target.fire('mouseout', { e: e });\n\n var _this = this;\n this._hoveredTargets.forEach(function(_target){\n _this.fire('mouse:out', { target: target, e: e });\n _target && target.fire('mouseout', { e: e });\n });\n this._hoveredTargets = [];\n\n if (this._iTextInstances) {\n this._iTextInstances.forEach(function(obj) {\n if (obj.isEditing) {\n obj.hiddenTextarea.focus();\n }\n });\n }\n },\n\n /**\n * @private\n * @param {Event} e Event object fired on mouseenter\n */\n _onMouseEnter: function(e) {\n // This find target and consequent 'mouse:over' is used to\n // clear old instances on hovered target.\n // calling findTarget has the side effect of killing target.__corner.\n // as a short term fix we are not firing this if we are currently transforming.\n // as a long term fix we need to separate the action of finding a target with the\n // side effects we added to it.\n if (!this._currentTransform && !this.findTarget(e)) {\n this.fire('mouse:over', { target: null, e: e });\n this._hoveredTarget = null;\n this._hoveredTargets = [];\n }\n },\n\n /**\n * @private\n * @param {Event} [e] Event object fired on Event.js orientation change\n * @param {Event} [self] Inner Event object\n */\n _onOrientationChange: function(e, self) {\n this.__onOrientationChange && this.__onOrientationChange(e, self);\n },\n\n /**\n * @private\n * @param {Event} [e] Event object fired on Event.js shake\n * @param {Event} [self] Inner Event object\n */\n _onShake: function(e, self) {\n this.__onShake && this.__onShake(e, self);\n },\n\n /**\n * @private\n * @param {Event} [e] Event object fired on Event.js shake\n * @param {Event} [self] Inner Event object\n */\n _onLongPress: function(e, self) {\n this.__onLongPress && this.__onLongPress(e, self);\n },\n\n /**\n * prevent default to allow drop event to be fired\n * @private\n * @param {Event} [e] Event object fired on Event.js shake\n */\n _onDragOver: function(e) {\n e.preventDefault();\n var target = this._simpleEventHandler('dragover', e);\n this._fireEnterLeaveEvents(target, e);\n },\n\n /**\n * @private\n * @param {Event} e Event object fired on mousedown\n */\n _onContextMenu: function (e) {\n if (this.stopContextMenu) {\n e.stopPropagation();\n e.preventDefault();\n }\n return false;\n },\n\n /**\n * @private\n * @param {Event} e Event object fired on mousedown\n */\n _onDoubleClick: function (e) {\n this._cacheTransformEventData(e);\n this._handleEvent(e, 'dblclick');\n this._resetTransformEventData(e);\n },\n\n /**\n * Return a the id of an event.\n * returns either the pointerId or the identifier or 0 for the mouse event\n * @private\n * @param {Event} evt Event object\n */\n getPointerId: function(evt) {\n var changedTouches = evt.changedTouches;\n\n if (changedTouches) {\n return changedTouches[0] && changedTouches[0].identifier;\n }\n\n if (this.enablePointerEvents) {\n return evt.pointerId;\n }\n\n return -1;\n },\n\n /**\n * Determines if an event has the id of the event that is considered main\n * @private\n * @param {evt} event Event object\n */\n _isMainEvent: function(evt) {\n if (evt.isPrimary === true) {\n return true;\n }\n if (evt.isPrimary === false) {\n return false;\n }\n if (evt.type === 'touchend' && evt.touches.length === 0) {\n return true;\n }\n if (evt.changedTouches) {\n return evt.changedTouches[0].identifier === this.mainTouchId;\n }\n return true;\n },\n\n /**\n * @private\n * @param {Event} e Event object fired on mousedown\n */\n _onTouchStart: function(e) {\n e.preventDefault();\n if (this.mainTouchId === null) {\n this.mainTouchId = this.getPointerId(e);\n }\n this.__onMouseDown(e);\n this._resetTransformEventData();\n var canvasElement = this.upperCanvasEl,\n eventTypePrefix = this._getEventPrefix();\n addListener(fabric.document, 'touchend', this._onTouchEnd, addEventOptions);\n addListener(fabric.document, 'touchmove', this._onMouseMove, addEventOptions);\n // Unbind mousedown to prevent double triggers from touch devices\n removeListener(canvasElement, eventTypePrefix + 'down', this._onMouseDown);\n },\n\n /**\n * @private\n * @param {Event} e Event object fired on mousedown\n */\n _onMouseDown: function (e) {\n this.__onMouseDown(e);\n this._resetTransformEventData();\n var canvasElement = this.upperCanvasEl,\n eventTypePrefix = this._getEventPrefix();\n removeListener(canvasElement, eventTypePrefix + 'move', this._onMouseMove, addEventOptions);\n addListener(fabric.document, eventTypePrefix + 'up', this._onMouseUp);\n addListener(fabric.document, eventTypePrefix + 'move', this._onMouseMove, addEventOptions);\n },\n\n /**\n * @private\n * @param {Event} e Event object fired on mousedown\n */\n _onTouchEnd: function(e) {\n if (e.touches.length > 0) {\n // if there are still touches stop here\n return;\n }\n this.__onMouseUp(e);\n this._resetTransformEventData();\n this.mainTouchId = null;\n var eventTypePrefix = this._getEventPrefix();\n removeListener(fabric.document, 'touchend', this._onTouchEnd, addEventOptions);\n removeListener(fabric.document, 'touchmove', this._onMouseMove, addEventOptions);\n var _this = this;\n if (this._willAddMouseDown) {\n clearTimeout(this._willAddMouseDown);\n }\n this._willAddMouseDown = setTimeout(function() {\n // Wait 400ms before rebinding mousedown to prevent double triggers\n // from touch devices\n addListener(_this.upperCanvasEl, eventTypePrefix + 'down', _this._onMouseDown);\n _this._willAddMouseDown = 0;\n }, 400);\n },\n\n /**\n * @private\n * @param {Event} e Event object fired on mouseup\n */\n _onMouseUp: function (e) {\n this.__onMouseUp(e);\n this._resetTransformEventData();\n var canvasElement = this.upperCanvasEl,\n eventTypePrefix = this._getEventPrefix();\n if (this._isMainEvent(e)) {\n removeListener(fabric.document, eventTypePrefix + 'up', this._onMouseUp);\n removeListener(fabric.document, eventTypePrefix + 'move', this._onMouseMove, addEventOptions);\n addListener(canvasElement, eventTypePrefix + 'move', this._onMouseMove, addEventOptions);\n }\n },\n\n /**\n * @private\n * @param {Event} e Event object fired on mousemove\n */\n _onMouseMove: function (e) {\n !this.allowTouchScrolling && e.preventDefault && e.preventDefault();\n this.__onMouseMove(e);\n },\n\n /**\n * @private\n */\n _onResize: function () {\n this.calcOffset();\n },\n\n /**\n * Decides whether the canvas should be redrawn in mouseup and mousedown events.\n * @private\n * @param {Object} target\n */\n _shouldRender: function(target) {\n var activeObject = this._activeObject;\n\n if (\n !!activeObject !== !!target ||\n (activeObject && target && (activeObject !== target))\n ) {\n // this covers: switch of target, from target to no target, selection of target\n // multiSelection with key and mouse\n return true;\n }\n else if (activeObject && activeObject.isEditing) {\n // if we mouse up/down over a editing textbox a cursor change,\n // there is no need to re render\n return false;\n }\n return false;\n },\n\n /**\n * Method that defines the actions when mouse is released on canvas.\n * The method resets the currentTransform parameters, store the image corner\n * position in the image object and render the canvas on top.\n * @private\n * @param {Event} e Event object fired on mouseup\n */\n __onMouseUp: function (e) {\n var target, transform = this._currentTransform,\n groupSelector = this._groupSelector, shouldRender = false,\n isClick = (!groupSelector || (groupSelector.left === 0 && groupSelector.top === 0));\n this._cacheTransformEventData(e);\n target = this._target;\n this._handleEvent(e, 'up:before');\n // if right/middle click just fire events and return\n // target undefined will make the _handleEvent search the target\n if (checkClick(e, RIGHT_CLICK)) {\n if (this.fireRightClick) {\n this._handleEvent(e, 'up', RIGHT_CLICK, isClick);\n }\n return;\n }\n\n if (checkClick(e, MIDDLE_CLICK)) {\n if (this.fireMiddleClick) {\n this._handleEvent(e, 'up', MIDDLE_CLICK, isClick);\n }\n this._resetTransformEventData();\n return;\n }\n\n if (this.isDrawingMode && this._isCurrentlyDrawing) {\n this._onMouseUpInDrawingMode(e);\n return;\n }\n\n if (!this._isMainEvent(e)) {\n return;\n }\n if (transform) {\n this._finalizeCurrentTransform(e);\n shouldRender = transform.actionPerformed;\n }\n if (!isClick) {\n var targetWasActive = target === this._activeObject;\n this._maybeGroupObjects(e);\n if (!shouldRender) {\n shouldRender = (\n this._shouldRender(target) ||\n (!targetWasActive && target === this._activeObject)\n );\n }\n }\n if (target) {\n var corner = target._findTargetCorner(\n this.getPointer(e, true),\n fabric.util.isTouchEvent(e)\n );\n var control = target.controls[corner],\n mouseUpHandler = control && control.getMouseUpHandler(e, target, control);\n if (mouseUpHandler) {\n mouseUpHandler(e, target, control);\n }\n target.isMoving = false;\n }\n this._setCursorFromEvent(e, target);\n this._handleEvent(e, 'up', LEFT_CLICK, isClick);\n this._groupSelector = null;\n this._currentTransform = null;\n // reset the target information about which corner is selected\n target && (target.__corner = 0);\n if (shouldRender) {\n this.requestRenderAll();\n }\n else if (!isClick) {\n this.renderTop();\n }\n },\n\n /**\n * @private\n * Handle event firing for target and subtargets\n * @param {Event} e event from mouse\n * @param {String} eventType event to fire (up, down or move)\n * @return {Fabric.Object} target return the the target found, for internal reasons.\n */\n _simpleEventHandler: function(eventType, e) {\n var target = this.findTarget(e),\n targets = this.targets,\n options = {\n e: e,\n target: target,\n subTargets: targets,\n };\n this.fire(eventType, options);\n target && target.fire(eventType, options);\n if (!targets) {\n return target;\n }\n for (var i = 0; i < targets.length; i++) {\n targets[i].fire(eventType, options);\n }\n return target;\n },\n\n /**\n * @private\n * Handle event firing for target and subtargets\n * @param {Event} e event from mouse\n * @param {String} eventType event to fire (up, down or move)\n * @param {fabric.Object} targetObj receiving event\n * @param {Number} [button] button used in the event 1 = left, 2 = middle, 3 = right\n * @param {Boolean} isClick for left button only, indicates that the mouse up happened without move.\n */\n _handleEvent: function(e, eventType, button, isClick) {\n var target = this._target,\n targets = this.targets || [],\n options = {\n e: e,\n target: target,\n subTargets: targets,\n button: button || LEFT_CLICK,\n isClick: isClick || false,\n pointer: this._pointer,\n absolutePointer: this._absolutePointer,\n transform: this._currentTransform\n };\n if (eventType === 'up') {\n options.currentTarget = this.findTarget(e);\n options.currentSubTargets = this.targets;\n }\n this.fire('mouse:' + eventType, options);\n target && target.fire('mouse' + eventType, options);\n for (var i = 0; i < targets.length; i++) {\n targets[i].fire('mouse' + eventType, options);\n }\n },\n\n /**\n * @private\n * @param {Event} e send the mouse event that generate the finalize down, so it can be used in the event\n */\n _finalizeCurrentTransform: function(e) {\n\n var transform = this._currentTransform,\n target = transform.target,\n eventName,\n options = {\n e: e,\n target: target,\n transform: transform,\n action: transform.action,\n };\n\n if (target._scaling) {\n target._scaling = false;\n }\n\n target.setCoords();\n\n if (transform.actionPerformed || (this.stateful && target.hasStateChanged())) {\n if (transform.actionPerformed) {\n // this is not friendly to the new control api.\n // is deprecated.\n eventName = this._addEventOptions(options, transform);\n this._fire(eventName, options);\n }\n this._fire('modified', options);\n }\n },\n\n /**\n * Mutate option object in order to add by property and give back the event name.\n * @private\n * @deprecated since 4.2.0\n * @param {Object} options to mutate\n * @param {Object} transform to inspect action from\n */\n _addEventOptions: function(options, transform) {\n // we can probably add more details at low cost\n // scale change, rotation changes, translation changes\n var eventName, by;\n switch (transform.action) {\n case 'scaleX':\n eventName = 'scaled';\n by = 'x';\n break;\n case 'scaleY':\n eventName = 'scaled';\n by = 'y';\n break;\n case 'skewX':\n eventName = 'skewed';\n by = 'x';\n break;\n case 'skewY':\n eventName = 'skewed';\n by = 'y';\n break;\n case 'scale':\n eventName = 'scaled';\n by = 'equally';\n break;\n case 'rotate':\n eventName = 'rotated';\n break;\n case 'drag':\n eventName = 'moved';\n break;\n }\n options.by = by;\n return eventName;\n },\n\n /**\n * @private\n * @param {Event} e Event object fired on mousedown\n */\n _onMouseDownInDrawingMode: function(e) {\n this._isCurrentlyDrawing = true;\n if (this.getActiveObject()) {\n this.discardActiveObject(e).requestRenderAll();\n }\n var pointer = this.getPointer(e);\n this.freeDrawingBrush.onMouseDown(pointer, { e: e, pointer: pointer });\n this._handleEvent(e, 'down');\n },\n\n /**\n * @private\n * @param {Event} e Event object fired on mousemove\n */\n _onMouseMoveInDrawingMode: function(e) {\n if (this._isCurrentlyDrawing) {\n var pointer = this.getPointer(e);\n this.freeDrawingBrush.onMouseMove(pointer, { e: e, pointer: pointer });\n }\n this.setCursor(this.freeDrawingCursor);\n this._handleEvent(e, 'move');\n },\n\n /**\n * @private\n * @param {Event} e Event object fired on mouseup\n */\n _onMouseUpInDrawingMode: function(e) {\n var pointer = this.getPointer(e);\n this._isCurrentlyDrawing = this.freeDrawingBrush.onMouseUp({ e: e, pointer: pointer });\n this._handleEvent(e, 'up');\n },\n\n /**\n * Method that defines the actions when mouse is clicked on canvas.\n * The method inits the currentTransform parameters and renders all the\n * canvas so the current image can be placed on the top canvas and the rest\n * in on the container one.\n * @private\n * @param {Event} e Event object fired on mousedown\n */\n __onMouseDown: function (e) {\n this._cacheTransformEventData(e);\n this._handleEvent(e, 'down:before');\n var target = this._target;\n // if right click just fire events\n if (checkClick(e, RIGHT_CLICK)) {\n if (this.fireRightClick) {\n this._handleEvent(e, 'down', RIGHT_CLICK);\n }\n return;\n }\n\n if (checkClick(e, MIDDLE_CLICK)) {\n if (this.fireMiddleClick) {\n this._handleEvent(e, 'down', MIDDLE_CLICK);\n }\n return;\n }\n\n if (this.isDrawingMode) {\n this._onMouseDownInDrawingMode(e);\n return;\n }\n\n if (!this._isMainEvent(e)) {\n return;\n }\n\n // ignore if some object is being transformed at this moment\n if (this._currentTransform) {\n return;\n }\n\n var pointer = this._pointer;\n // save pointer for check in __onMouseUp event\n this._previousPointer = pointer;\n var shouldRender = this._shouldRender(target),\n shouldGroup = this._shouldGroup(e, target);\n if (this._shouldClearSelection(e, target)) {\n this.discardActiveObject(e);\n }\n else if (shouldGroup) {\n this._handleGrouping(e, target);\n target = this._activeObject;\n }\n\n if (this.selection && (!target ||\n (!target.selectable && !target.isEditing && target !== this._activeObject))) {\n this._groupSelector = {\n ex: pointer.x,\n ey: pointer.y,\n top: 0,\n left: 0\n };\n }\n\n if (target) {\n var alreadySelected = target === this._activeObject;\n if (target.selectable) {\n this.setActiveObject(target, e);\n }\n var corner = target._findTargetCorner(\n this.getPointer(e, true),\n fabric.util.isTouchEvent(e)\n );\n target.__corner = corner;\n if (target === this._activeObject && (corner || !shouldGroup)) {\n var control = target.controls[corner],\n mouseDownHandler = control && control.getMouseDownHandler(e, target, control);\n if (mouseDownHandler) {\n mouseDownHandler(e, target, control);\n }\n this._setupCurrentTransform(e, target, alreadySelected);\n }\n }\n this._handleEvent(e, 'down');\n // we must renderAll so that we update the visuals\n (shouldRender || shouldGroup) && this.requestRenderAll();\n },\n\n /**\n * reset cache form common information needed during event processing\n * @private\n */\n _resetTransformEventData: function() {\n this._target = null;\n this._pointer = null;\n this._absolutePointer = null;\n },\n\n /**\n * Cache common information needed during event processing\n * @private\n * @param {Event} e Event object fired on event\n */\n _cacheTransformEventData: function(e) {\n // reset in order to avoid stale caching\n this._resetTransformEventData();\n this._pointer = this.getPointer(e, true);\n this._absolutePointer = this.restorePointerVpt(this._pointer);\n this._target = this._currentTransform ? this._currentTransform.target : this.findTarget(e) || null;\n },\n\n /**\n * @private\n */\n _beforeTransform: function(e) {\n var t = this._currentTransform;\n this.stateful && t.target.saveState();\n this.fire('before:transform', {\n e: e,\n transform: t,\n });\n },\n\n /**\n * Method that defines the actions when mouse is hovering the canvas.\n * The currentTransform parameter will define whether the user is rotating/scaling/translating\n * an image or neither of them (only hovering). A group selection is also possible and would cancel\n * all any other type of action.\n * In case of an image transformation only the top canvas will be rendered.\n * @private\n * @param {Event} e Event object fired on mousemove\n */\n __onMouseMove: function (e) {\n this._handleEvent(e, 'move:before');\n this._cacheTransformEventData(e);\n var target, pointer;\n\n if (this.isDrawingMode) {\n this._onMouseMoveInDrawingMode(e);\n return;\n }\n\n if (!this._isMainEvent(e)) {\n return;\n }\n\n var groupSelector = this._groupSelector;\n\n // We initially clicked in an empty area, so we draw a box for multiple selection\n if (groupSelector) {\n pointer = this._pointer;\n\n groupSelector.left = pointer.x - groupSelector.ex;\n groupSelector.top = pointer.y - groupSelector.ey;\n\n this.renderTop();\n }\n else if (!this._currentTransform) {\n target = this.findTarget(e) || null;\n this._setCursorFromEvent(e, target);\n this._fireOverOutEvents(target, e);\n }\n else {\n this._transformObject(e);\n }\n this._handleEvent(e, 'move');\n this._resetTransformEventData();\n },\n\n /**\n * Manage the mouseout, mouseover events for the fabric object on the canvas\n * @param {Fabric.Object} target the target where the target from the mousemove event\n * @param {Event} e Event object fired on mousemove\n * @private\n */\n _fireOverOutEvents: function(target, e) {\n var _hoveredTarget = this._hoveredTarget,\n _hoveredTargets = this._hoveredTargets, targets = this.targets,\n length = Math.max(_hoveredTargets.length, targets.length);\n\n this.fireSyntheticInOutEvents(target, e, {\n oldTarget: _hoveredTarget,\n evtOut: 'mouseout',\n canvasEvtOut: 'mouse:out',\n evtIn: 'mouseover',\n canvasEvtIn: 'mouse:over',\n });\n for (var i = 0; i < length; i++){\n this.fireSyntheticInOutEvents(targets[i], e, {\n oldTarget: _hoveredTargets[i],\n evtOut: 'mouseout',\n evtIn: 'mouseover',\n });\n }\n this._hoveredTarget = target;\n this._hoveredTargets = this.targets.concat();\n },\n\n /**\n * Manage the dragEnter, dragLeave events for the fabric objects on the canvas\n * @param {Fabric.Object} target the target where the target from the onDrag event\n * @param {Event} e Event object fired on ondrag\n * @private\n */\n _fireEnterLeaveEvents: function(target, e) {\n var _draggedoverTarget = this._draggedoverTarget,\n _hoveredTargets = this._hoveredTargets, targets = this.targets,\n length = Math.max(_hoveredTargets.length, targets.length);\n\n this.fireSyntheticInOutEvents(target, e, {\n oldTarget: _draggedoverTarget,\n evtOut: 'dragleave',\n evtIn: 'dragenter',\n });\n for (var i = 0; i < length; i++) {\n this.fireSyntheticInOutEvents(targets[i], e, {\n oldTarget: _hoveredTargets[i],\n evtOut: 'dragleave',\n evtIn: 'dragenter',\n });\n }\n this._draggedoverTarget = target;\n },\n\n /**\n * Manage the synthetic in/out events for the fabric objects on the canvas\n * @param {Fabric.Object} target the target where the target from the supported events\n * @param {Event} e Event object fired\n * @param {Object} config configuration for the function to work\n * @param {String} config.targetName property on the canvas where the old target is stored\n * @param {String} [config.canvasEvtOut] name of the event to fire at canvas level for out\n * @param {String} config.evtOut name of the event to fire for out\n * @param {String} [config.canvasEvtIn] name of the event to fire at canvas level for in\n * @param {String} config.evtIn name of the event to fire for in\n * @private\n */\n fireSyntheticInOutEvents: function(target, e, config) {\n var inOpt, outOpt, oldTarget = config.oldTarget, outFires, inFires,\n targetChanged = oldTarget !== target, canvasEvtIn = config.canvasEvtIn, canvasEvtOut = config.canvasEvtOut;\n if (targetChanged) {\n inOpt = { e: e, target: target, previousTarget: oldTarget };\n outOpt = { e: e, target: oldTarget, nextTarget: target };\n }\n inFires = target && targetChanged;\n outFires = oldTarget && targetChanged;\n if (outFires) {\n canvasEvtOut && this.fire(canvasEvtOut, outOpt);\n oldTarget.fire(config.evtOut, outOpt);\n }\n if (inFires) {\n canvasEvtIn && this.fire(canvasEvtIn, inOpt);\n target.fire(config.evtIn, inOpt);\n }\n },\n\n /**\n * Method that defines actions when an Event Mouse Wheel\n * @param {Event} e Event object fired on mouseup\n */\n __onMouseWheel: function(e) {\n this._cacheTransformEventData(e);\n this._handleEvent(e, 'wheel');\n this._resetTransformEventData();\n },\n\n /**\n * @private\n * @param {Event} e Event fired on mousemove\n */\n _transformObject: function(e) {\n var pointer = this.getPointer(e),\n transform = this._currentTransform;\n\n transform.reset = false;\n transform.target.isMoving = true;\n transform.shiftKey = e.shiftKey;\n transform.altKey = e[this.centeredKey];\n\n this._performTransformAction(e, transform, pointer);\n transform.actionPerformed && this.requestRenderAll();\n },\n\n /**\n * @private\n */\n _performTransformAction: function(e, transform, pointer) {\n var x = pointer.x,\n y = pointer.y,\n action = transform.action,\n actionPerformed = false,\n actionHandler = transform.actionHandler;\n // this object could be created from the function in the control handlers\n\n\n if (actionHandler) {\n actionPerformed = actionHandler(e, transform, x, y);\n }\n if (action === 'drag' && actionPerformed) {\n this.setCursor(transform.target.moveCursor || this.moveCursor);\n }\n transform.actionPerformed = transform.actionPerformed || actionPerformed;\n },\n\n /**\n * @private\n */\n _fire: fabric.controlsUtils.fireEvent,\n\n /**\n * Sets the cursor depending on where the canvas is being hovered.\n * Note: very buggy in Opera\n * @param {Event} e Event object\n * @param {Object} target Object that the mouse is hovering, if so.\n */\n _setCursorFromEvent: function (e, target) {\n if (!target) {\n this.setCursor(this.defaultCursor);\n return false;\n }\n var hoverCursor = target.hoverCursor || this.hoverCursor,\n activeSelection = this._activeObject && this._activeObject.type === 'activeSelection' ?\n this._activeObject : null,\n // only show proper corner when group selection is not active\n corner = (!activeSelection || !activeSelection.contains(target))\n // here we call findTargetCorner always with undefined for the touch parameter.\n // we assume that if you are using a cursor you do not need to interact with\n // the bigger touch area.\n && target._findTargetCorner(this.getPointer(e, true));\n\n if (!corner) {\n if (target.subTargetCheck){\n // hoverCursor should come from top-most subTarget,\n // so we walk the array backwards\n this.targets.concat().reverse().map(function(_target){\n hoverCursor = _target.hoverCursor || hoverCursor;\n });\n }\n this.setCursor(hoverCursor);\n }\n else {\n this.setCursor(this.getCornerCursor(corner, target, e));\n }\n },\n\n /**\n * @private\n */\n getCornerCursor: function(corner, target, e) {\n var control = target.controls[corner];\n return control.cursorStyleHandler(e, control, target);\n }\n });\n})();\n\n\n(function() {\n\n var min = Math.min,\n max = Math.max;\n\n fabric.util.object.extend(fabric.Canvas.prototype, /** @lends fabric.Canvas.prototype */ {\n\n /**\n * @private\n * @param {Event} e Event object\n * @param {fabric.Object} target\n * @return {Boolean}\n */\n _shouldGroup: function(e, target) {\n var activeObject = this._activeObject;\n return activeObject && this._isSelectionKeyPressed(e) && target && target.selectable && this.selection &&\n (activeObject !== target || activeObject.type === 'activeSelection') && !target.onSelect({ e: e });\n },\n\n /**\n * @private\n * @param {Event} e Event object\n * @param {fabric.Object} target\n */\n _handleGrouping: function (e, target) {\n var activeObject = this._activeObject;\n // avoid multi select when shift click on a corner\n if (activeObject.__corner) {\n return;\n }\n if (target === activeObject) {\n // if it's a group, find target again, using activeGroup objects\n target = this.findTarget(e, true);\n // if even object is not found or we are on activeObjectCorner, bail out\n if (!target || !target.selectable) {\n return;\n }\n }\n if (activeObject && activeObject.type === 'activeSelection') {\n this._updateActiveSelection(target, e);\n }\n else {\n this._createActiveSelection(target, e);\n }\n },\n\n /**\n * @private\n */\n _updateActiveSelection: function(target, e) {\n var activeSelection = this._activeObject,\n currentActiveObjects = activeSelection._objects.slice(0);\n if (activeSelection.contains(target)) {\n activeSelection.removeWithUpdate(target);\n this._hoveredTarget = target;\n this._hoveredTargets = this.targets.concat();\n if (activeSelection.size() === 1) {\n // activate last remaining object\n this._setActiveObject(activeSelection.item(0), e);\n }\n }\n else {\n activeSelection.addWithUpdate(target);\n this._hoveredTarget = activeSelection;\n this._hoveredTargets = this.targets.concat();\n }\n this._fireSelectionEvents(currentActiveObjects, e);\n },\n\n /**\n * @private\n */\n _createActiveSelection: function(target, e) {\n var currentActives = this.getActiveObjects(), group = this._createGroup(target);\n this._hoveredTarget = group;\n // ISSUE 4115: should we consider subTargets here?\n // this._hoveredTargets = [];\n // this._hoveredTargets = this.targets.concat();\n this._setActiveObject(group, e);\n this._fireSelectionEvents(currentActives, e);\n },\n\n /**\n * @private\n * @param {Object} target\n */\n _createGroup: function(target) {\n var objects = this._objects,\n isActiveLower = objects.indexOf(this._activeObject) < objects.indexOf(target),\n groupObjects = isActiveLower\n ? [this._activeObject, target]\n : [target, this._activeObject];\n this._activeObject.isEditing && this._activeObject.exitEditing();\n return new fabric.ActiveSelection(groupObjects, {\n canvas: this\n });\n },\n\n /**\n * @private\n * @param {Event} e mouse event\n */\n _groupSelectedObjects: function (e) {\n\n var group = this._collectObjects(e),\n aGroup;\n\n // do not create group for 1 element only\n if (group.length === 1) {\n this.setActiveObject(group[0], e);\n }\n else if (group.length > 1) {\n aGroup = new fabric.ActiveSelection(group.reverse(), {\n canvas: this\n });\n this.setActiveObject(aGroup, e);\n }\n },\n\n /**\n * @private\n */\n _collectObjects: function(e) {\n var group = [],\n currentObject,\n x1 = this._groupSelector.ex,\n y1 = this._groupSelector.ey,\n x2 = x1 + this._groupSelector.left,\n y2 = y1 + this._groupSelector.top,\n selectionX1Y1 = new fabric.Point(min(x1, x2), min(y1, y2)),\n selectionX2Y2 = new fabric.Point(max(x1, x2), max(y1, y2)),\n allowIntersect = !this.selectionFullyContained,\n isClick = x1 === x2 && y1 === y2;\n // we iterate reverse order to collect top first in case of click.\n for (var i = this._objects.length; i--; ) {\n currentObject = this._objects[i];\n\n if (!currentObject || !currentObject.selectable || !currentObject.visible) {\n continue;\n }\n\n if ((allowIntersect && currentObject.intersectsWithRect(selectionX1Y1, selectionX2Y2)) ||\n currentObject.isContainedWithinRect(selectionX1Y1, selectionX2Y2) ||\n (allowIntersect && currentObject.containsPoint(selectionX1Y1)) ||\n (allowIntersect && currentObject.containsPoint(selectionX2Y2))\n ) {\n group.push(currentObject);\n // only add one object if it's a click\n if (isClick) {\n break;\n }\n }\n }\n\n if (group.length > 1) {\n group = group.filter(function(object) {\n return !object.onSelect({ e: e });\n });\n }\n\n return group;\n },\n\n /**\n * @private\n */\n _maybeGroupObjects: function(e) {\n if (this.selection && this._groupSelector) {\n this._groupSelectedObjects(e);\n }\n this.setCursor(this.defaultCursor);\n // clear selection and current transformation\n this._groupSelector = null;\n }\n });\n\n})();\n\n\n(function () {\n fabric.util.object.extend(fabric.StaticCanvas.prototype, /** @lends fabric.StaticCanvas.prototype */ {\n\n /**\n * Exports canvas element to a dataurl image. Note that when multiplier is used, cropping is scaled appropriately\n * @param {Object} [options] Options object\n * @param {String} [options.format=png] The format of the output image. Either \"jpeg\" or \"png\"\n * @param {Number} [options.quality=1] Quality level (0..1). Only used for jpeg.\n * @param {Number} [options.multiplier=1] Multiplier to scale by, to have consistent\n * @param {Number} [options.left] Cropping left offset. Introduced in v1.2.14\n * @param {Number} [options.top] Cropping top offset. Introduced in v1.2.14\n * @param {Number} [options.width] Cropping width. Introduced in v1.2.14\n * @param {Number} [options.height] Cropping height. Introduced in v1.2.14\n * @param {Boolean} [options.enableRetinaScaling] Enable retina scaling for clone image. Introduce in 2.0.0\n * @return {String} Returns a data: URL containing a representation of the object in the format specified by options.format\n * @see {@link http://jsfiddle.net/fabricjs/NfZVb/|jsFiddle demo}\n * @example <caption>Generate jpeg dataURL with lower quality</caption>\n * var dataURL = canvas.toDataURL({\n * format: 'jpeg',\n * quality: 0.8\n * });\n * @example <caption>Generate cropped png dataURL (clipping of canvas)</caption>\n * var dataURL = canvas.toDataURL({\n * format: 'png',\n * left: 100,\n * top: 100,\n * width: 200,\n * height: 200\n * });\n * @example <caption>Generate double scaled png dataURL</caption>\n * var dataURL = canvas.toDataURL({\n * format: 'png',\n * multiplier: 2\n * });\n */\n toDataURL: function (options) {\n options || (options = { });\n\n var format = options.format || 'png',\n quality = options.quality || 1,\n multiplier = (options.multiplier || 1) * (options.enableRetinaScaling ? this.getRetinaScaling() : 1),\n canvasEl = this.toCanvasElement(multiplier, options);\n return fabric.util.toDataURL(canvasEl, format, quality);\n },\n\n /**\n * Create a new HTMLCanvas element painted with the current canvas content.\n * No need to resize the actual one or repaint it.\n * Will transfer object ownership to a new canvas, paint it, and set everything back.\n * This is an intermediary step used to get to a dataUrl but also it is useful to\n * create quick image copies of a canvas without passing for the dataUrl string\n * @param {Number} [multiplier] a zoom factor.\n * @param {Object} [cropping] Cropping informations\n * @param {Number} [cropping.left] Cropping left offset.\n * @param {Number} [cropping.top] Cropping top offset.\n * @param {Number} [cropping.width] Cropping width.\n * @param {Number} [cropping.height] Cropping height.\n */\n toCanvasElement: function(multiplier, cropping) {\n multiplier = multiplier || 1;\n cropping = cropping || { };\n var scaledWidth = (cropping.width || this.width) * multiplier,\n scaledHeight = (cropping.height || this.height) * multiplier,\n zoom = this.getZoom(),\n originalWidth = this.width,\n originalHeight = this.height,\n newZoom = zoom * multiplier,\n vp = this.viewportTransform,\n translateX = (vp[4] - (cropping.left || 0)) * multiplier,\n translateY = (vp[5] - (cropping.top || 0)) * multiplier,\n originalInteractive = this.interactive,\n newVp = [newZoom, 0, 0, newZoom, translateX, translateY],\n originalRetina = this.enableRetinaScaling,\n canvasEl = fabric.util.createCanvasElement(),\n originalContextTop = this.contextTop;\n canvasEl.width = scaledWidth;\n canvasEl.height = scaledHeight;\n this.contextTop = null;\n this.enableRetinaScaling = false;\n this.interactive = false;\n this.viewportTransform = newVp;\n this.width = scaledWidth;\n this.height = scaledHeight;\n this.calcViewportBoundaries();\n this.renderCanvas(canvasEl.getContext('2d'), this._objects);\n this.viewportTransform = vp;\n this.width = originalWidth;\n this.height = originalHeight;\n this.calcViewportBoundaries();\n this.interactive = originalInteractive;\n this.enableRetinaScaling = originalRetina;\n this.contextTop = originalContextTop;\n return canvasEl;\n },\n });\n\n})();\n\n\nfabric.util.object.extend(fabric.StaticCanvas.prototype, /** @lends fabric.StaticCanvas.prototype */ {\n /**\n * Populates canvas with data from the specified JSON.\n * JSON format must conform to the one of {@link fabric.Canvas#toJSON}\n * @param {String|Object} json JSON string or object\n * @param {Function} callback Callback, invoked when json is parsed\n * and corresponding objects (e.g: {@link fabric.Image})\n * are initialized\n * @param {Function} [reviver] Method for further parsing of JSON elements, called after each fabric object created.\n * @return {fabric.Canvas} instance\n * @chainable\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-3#deserialization}\n * @see {@link http://jsfiddle.net/fabricjs/fmgXt/|jsFiddle demo}\n * @example <caption>loadFromJSON</caption>\n * canvas.loadFromJSON(json, canvas.renderAll.bind(canvas));\n * @example <caption>loadFromJSON with reviver</caption>\n * canvas.loadFromJSON(json, canvas.renderAll.bind(canvas), function(o, object) {\n * // `o` = json object\n * // `object` = fabric.Object instance\n * // ... do some stuff ...\n * });\n */\n loadFromJSON: function (json, callback, reviver) {\n if (!json) {\n return;\n }\n\n // serialize if it wasn't already\n var serialized = (typeof json === 'string')\n ? JSON.parse(json)\n : fabric.util.object.clone(json);\n\n var _this = this,\n clipPath = serialized.clipPath,\n renderOnAddRemove = this.renderOnAddRemove;\n\n this.renderOnAddRemove = false;\n\n delete serialized.clipPath;\n\n this._enlivenObjects(serialized.objects, function (enlivenedObjects) {\n _this.clear();\n _this._setBgOverlay(serialized, function () {\n if (clipPath) {\n _this._enlivenObjects([clipPath], function (enlivenedCanvasClip) {\n _this.clipPath = enlivenedCanvasClip[0];\n _this.__setupCanvas.call(_this, serialized, enlivenedObjects, renderOnAddRemove, callback);\n });\n }\n else {\n _this.__setupCanvas.call(_this, serialized, enlivenedObjects, renderOnAddRemove, callback);\n }\n });\n }, reviver);\n return this;\n },\n\n /**\n * @private\n * @param {Object} serialized Object with background and overlay information\n * @param {Array} restored canvas objects\n * @param {Function} cached renderOnAddRemove callback\n * @param {Function} callback Invoked after all background and overlay images/patterns loaded\n */\n __setupCanvas: function(serialized, enlivenedObjects, renderOnAddRemove, callback) {\n var _this = this;\n enlivenedObjects.forEach(function(obj, index) {\n // we splice the array just in case some custom classes restored from JSON\n // will add more object to canvas at canvas init.\n _this.insertAt(obj, index);\n });\n this.renderOnAddRemove = renderOnAddRemove;\n // remove parts i cannot set as options\n delete serialized.objects;\n delete serialized.backgroundImage;\n delete serialized.overlayImage;\n delete serialized.background;\n delete serialized.overlay;\n // this._initOptions does too many things to just\n // call it. Normally loading an Object from JSON\n // create the Object instance. Here the Canvas is\n // already an instance and we are just loading things over it\n this._setOptions(serialized);\n this.renderAll();\n callback && callback();\n },\n\n /**\n * @private\n * @param {Object} serialized Object with background and overlay information\n * @param {Function} callback Invoked after all background and overlay images/patterns loaded\n */\n _setBgOverlay: function(serialized, callback) {\n var loaded = {\n backgroundColor: false,\n overlayColor: false,\n backgroundImage: false,\n overlayImage: false\n };\n\n if (!serialized.backgroundImage && !serialized.overlayImage && !serialized.background && !serialized.overlay) {\n callback && callback();\n return;\n }\n\n var cbIfLoaded = function () {\n if (loaded.backgroundImage && loaded.overlayImage && loaded.backgroundColor && loaded.overlayColor) {\n callback && callback();\n }\n };\n\n this.__setBgOverlay('backgroundImage', serialized.backgroundImage, loaded, cbIfLoaded);\n this.__setBgOverlay('overlayImage', serialized.overlayImage, loaded, cbIfLoaded);\n this.__setBgOverlay('backgroundColor', serialized.background, loaded, cbIfLoaded);\n this.__setBgOverlay('overlayColor', serialized.overlay, loaded, cbIfLoaded);\n },\n\n /**\n * @private\n * @param {String} property Property to set (backgroundImage, overlayImage, backgroundColor, overlayColor)\n * @param {(Object|String)} value Value to set\n * @param {Object} loaded Set loaded property to true if property is set\n * @param {Object} callback Callback function to invoke after property is set\n */\n __setBgOverlay: function(property, value, loaded, callback) {\n var _this = this;\n\n if (!value) {\n loaded[property] = true;\n callback && callback();\n return;\n }\n\n if (property === 'backgroundImage' || property === 'overlayImage') {\n fabric.util.enlivenObjects([value], function(enlivedObject){\n _this[property] = enlivedObject[0];\n loaded[property] = true;\n callback && callback();\n });\n }\n else {\n this['set' + fabric.util.string.capitalize(property, true)](value, function() {\n loaded[property] = true;\n callback && callback();\n });\n }\n },\n\n /**\n * @private\n * @param {Array} objects\n * @param {Function} callback\n * @param {Function} [reviver]\n */\n _enlivenObjects: function (objects, callback, reviver) {\n if (!objects || objects.length === 0) {\n callback && callback([]);\n return;\n }\n\n fabric.util.enlivenObjects(objects, function(enlivenedObjects) {\n callback && callback(enlivenedObjects);\n }, null, reviver);\n },\n\n /**\n * @private\n * @param {String} format\n * @param {Function} callback\n */\n _toDataURL: function (format, callback) {\n this.clone(function (clone) {\n callback(clone.toDataURL(format));\n });\n },\n\n /**\n * @private\n * @param {String} format\n * @param {Number} multiplier\n * @param {Function} callback\n */\n _toDataURLWithMultiplier: function (format, multiplier, callback) {\n this.clone(function (clone) {\n callback(clone.toDataURLWithMultiplier(format, multiplier));\n });\n },\n\n /**\n * Clones canvas instance\n * @param {Object} [callback] Receives cloned instance as a first argument\n * @param {Array} [properties] Array of properties to include in the cloned canvas and children\n */\n clone: function (callback, properties) {\n var data = JSON.stringify(this.toJSON(properties));\n this.cloneWithoutData(function(clone) {\n clone.loadFromJSON(data, function() {\n callback && callback(clone);\n });\n });\n },\n\n /**\n * Clones canvas instance without cloning existing data.\n * This essentially copies canvas dimensions, clipping properties, etc.\n * but leaves data empty (so that you can populate it with your own)\n * @param {Object} [callback] Receives cloned instance as a first argument\n */\n cloneWithoutData: function(callback) {\n var el = fabric.util.createCanvasElement();\n\n el.width = this.width;\n el.height = this.height;\n\n var clone = new fabric.Canvas(el);\n if (this.backgroundImage) {\n clone.setBackgroundImage(this.backgroundImage.src, function() {\n clone.renderAll();\n callback && callback(clone);\n });\n clone.backgroundImageOpacity = this.backgroundImageOpacity;\n clone.backgroundImageStretch = this.backgroundImageStretch;\n }\n else {\n callback && callback(clone);\n }\n }\n});\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }),\n extend = fabric.util.object.extend,\n clone = fabric.util.object.clone,\n toFixed = fabric.util.toFixed,\n capitalize = fabric.util.string.capitalize,\n degreesToRadians = fabric.util.degreesToRadians,\n supportsLineDash = fabric.StaticCanvas.supports('setLineDash'),\n objectCaching = !fabric.isLikelyNode,\n ALIASING_LIMIT = 2;\n\n if (fabric.Object) {\n return;\n }\n\n /**\n * Root object class from which all 2d shape classes inherit from\n * @class fabric.Object\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-1#objects}\n * @see {@link fabric.Object#initialize} for constructor definition\n *\n * @fires added\n * @fires removed\n *\n * @fires selected\n * @fires deselected\n * @fires modified\n * @fires modified\n * @fires moved\n * @fires scaled\n * @fires rotated\n * @fires skewed\n *\n * @fires rotating\n * @fires scaling\n * @fires moving\n * @fires skewing\n *\n * @fires mousedown\n * @fires mouseup\n * @fires mouseover\n * @fires mouseout\n * @fires mousewheel\n * @fires mousedblclick\n *\n * @fires dragover\n * @fires dragenter\n * @fires dragleave\n * @fires drop\n */\n fabric.Object = fabric.util.createClass(fabric.CommonMethods, /** @lends fabric.Object.prototype */ {\n\n /**\n * Type of an object (rect, circle, path, etc.).\n * Note that this property is meant to be read-only and not meant to be modified.\n * If you modify, certain parts of Fabric (such as JSON loading) won't work correctly.\n * @type String\n * @default\n */\n type: 'object',\n\n /**\n * Horizontal origin of transformation of an object (one of \"left\", \"right\", \"center\")\n * See http://jsfiddle.net/1ow02gea/244/ on how originX/originY affect objects in groups\n * @type String\n * @default\n */\n originX: 'left',\n\n /**\n * Vertical origin of transformation of an object (one of \"top\", \"bottom\", \"center\")\n * See http://jsfiddle.net/1ow02gea/244/ on how originX/originY affect objects in groups\n * @type String\n * @default\n */\n originY: 'top',\n\n /**\n * Top position of an object. Note that by default it's relative to object top. You can change this by setting originY={top/center/bottom}\n * @type Number\n * @default\n */\n top: 0,\n\n /**\n * Left position of an object. Note that by default it's relative to object left. You can change this by setting originX={left/center/right}\n * @type Number\n * @default\n */\n left: 0,\n\n /**\n * Object width\n * @type Number\n * @default\n */\n width: 0,\n\n /**\n * Object height\n * @type Number\n * @default\n */\n height: 0,\n\n /**\n * Object scale factor (horizontal)\n * @type Number\n * @default\n */\n scaleX: 1,\n\n /**\n * Object scale factor (vertical)\n * @type Number\n * @default\n */\n scaleY: 1,\n\n /**\n * When true, an object is rendered as flipped horizontally\n * @type Boolean\n * @default\n */\n flipX: false,\n\n /**\n * When true, an object is rendered as flipped vertically\n * @type Boolean\n * @default\n */\n flipY: false,\n\n /**\n * Opacity of an object\n * @type Number\n * @default\n */\n opacity: 1,\n\n /**\n * Angle of rotation of an object (in degrees)\n * @type Number\n * @default\n */\n angle: 0,\n\n /**\n * Angle of skew on x axes of an object (in degrees)\n * @type Number\n * @default\n */\n skewX: 0,\n\n /**\n * Angle of skew on y axes of an object (in degrees)\n * @type Number\n * @default\n */\n skewY: 0,\n\n /**\n * Size of object's controlling corners (in pixels)\n * @type Number\n * @default\n */\n cornerSize: 13,\n\n /**\n * Size of object's controlling corners when touch interaction is detected\n * @type Number\n * @default\n */\n touchCornerSize: 24,\n\n /**\n * When true, object's controlling corners are rendered as transparent inside (i.e. stroke instead of fill)\n * @type Boolean\n * @default\n */\n transparentCorners: true,\n\n /**\n * Default cursor value used when hovering over this object on canvas\n * @type String\n * @default\n */\n hoverCursor: null,\n\n /**\n * Default cursor value used when moving this object on canvas\n * @type String\n * @default\n */\n moveCursor: null,\n\n /**\n * Padding between object and its controlling borders (in pixels)\n * @type Number\n * @default\n */\n padding: 0,\n\n /**\n * Color of controlling borders of an object (when it's active)\n * @type String\n * @default\n */\n borderColor: 'rgb(178,204,255)',\n\n /**\n * Array specifying dash pattern of an object's borders (hasBorder must be true)\n * @since 1.6.2\n * @type Array\n */\n borderDashArray: null,\n\n /**\n * Color of controlling corners of an object (when it's active)\n * @type String\n * @default\n */\n cornerColor: 'rgb(178,204,255)',\n\n /**\n * Color of controlling corners of an object (when it's active and transparentCorners false)\n * @since 1.6.2\n * @type String\n * @default\n */\n cornerStrokeColor: null,\n\n /**\n * Specify style of control, 'rect' or 'circle'\n * @since 1.6.2\n * @type String\n */\n cornerStyle: 'rect',\n\n /**\n * Array specifying dash pattern of an object's control (hasBorder must be true)\n * @since 1.6.2\n * @type Array\n */\n cornerDashArray: null,\n\n /**\n * When true, this object will use center point as the origin of transformation\n * when being scaled via the controls.\n * <b>Backwards incompatibility note:</b> This property replaces \"centerTransform\" (Boolean).\n * @since 1.3.4\n * @type Boolean\n * @default\n */\n centeredScaling: false,\n\n /**\n * When true, this object will use center point as the origin of transformation\n * when being rotated via the controls.\n * <b>Backwards incompatibility note:</b> This property replaces \"centerTransform\" (Boolean).\n * @since 1.3.4\n * @type Boolean\n * @default\n */\n centeredRotation: true,\n\n /**\n * Color of object's fill\n * takes css colors https://www.w3.org/TR/css-color-3/\n * @type String\n * @default\n */\n fill: 'rgb(0,0,0)',\n\n /**\n * Fill rule used to fill an object\n * accepted values are nonzero, evenodd\n * <b>Backwards incompatibility note:</b> This property was used for setting globalCompositeOperation until v1.4.12 (use `fabric.Object#globalCompositeOperation` instead)\n * @type String\n * @default\n */\n fillRule: 'nonzero',\n\n /**\n * Composite rule used for canvas globalCompositeOperation\n * @type String\n * @default\n */\n globalCompositeOperation: 'source-over',\n\n /**\n * Background color of an object.\n * takes css colors https://www.w3.org/TR/css-color-3/\n * @type String\n * @default\n */\n backgroundColor: '',\n\n /**\n * Selection Background color of an object. colored layer behind the object when it is active.\n * does not mix good with globalCompositeOperation methods.\n * @type String\n * @default\n */\n selectionBackgroundColor: '',\n\n /**\n * When defined, an object is rendered via stroke and this property specifies its color\n * takes css colors https://www.w3.org/TR/css-color-3/\n * @type String\n * @default\n */\n stroke: null,\n\n /**\n * Width of a stroke used to render this object\n * @type Number\n * @default\n */\n strokeWidth: 1,\n\n /**\n * Array specifying dash pattern of an object's stroke (stroke must be defined)\n * @type Array\n */\n strokeDashArray: null,\n\n /**\n * Line offset of an object's stroke\n * @type Number\n * @default\n */\n strokeDashOffset: 0,\n\n /**\n * Line endings style of an object's stroke (one of \"butt\", \"round\", \"square\")\n * @type String\n * @default\n */\n strokeLineCap: 'butt',\n\n /**\n * Corner style of an object's stroke (one of \"bevil\", \"round\", \"miter\")\n * @type String\n * @default\n */\n strokeLineJoin: 'miter',\n\n /**\n * Maximum miter length (used for strokeLineJoin = \"miter\") of an object's stroke\n * @type Number\n * @default\n */\n strokeMiterLimit: 4,\n\n /**\n * Shadow object representing shadow of this shape\n * @type fabric.Shadow\n * @default\n */\n shadow: null,\n\n /**\n * Opacity of object's controlling borders when object is active and moving\n * @type Number\n * @default\n */\n borderOpacityWhenMoving: 0.4,\n\n /**\n * Scale factor of object's controlling borders\n * bigger number will make a thicker border\n * border is 1, so this is basically a border tickness\n * since there is no way to change the border itself.\n * @type Number\n * @default\n */\n borderScaleFactor: 1,\n\n /**\n * Minimum allowed scale value of an object\n * @type Number\n * @default\n */\n minScaleLimit: 0,\n\n /**\n * When set to `false`, an object can not be selected for modification (using either point-click-based or group-based selection).\n * But events still fire on it.\n * @type Boolean\n * @default\n */\n selectable: true,\n\n /**\n * When set to `false`, an object can not be a target of events. All events propagate through it. Introduced in v1.3.4\n * @type Boolean\n * @default\n */\n evented: true,\n\n /**\n * When set to `false`, an object is not rendered on canvas\n * @type Boolean\n * @default\n */\n visible: true,\n\n /**\n * When set to `false`, object's controls are not displayed and can not be used to manipulate object\n * @type Boolean\n * @default\n */\n hasControls: true,\n\n /**\n * When set to `false`, object's controlling borders are not rendered\n * @type Boolean\n * @default\n */\n hasBorders: true,\n\n /**\n * When set to `true`, objects are \"found\" on canvas on per-pixel basis rather than according to bounding box\n * @type Boolean\n * @default\n */\n perPixelTargetFind: false,\n\n /**\n * When `false`, default object's values are not included in its serialization\n * @type Boolean\n * @default\n */\n includeDefaultValues: true,\n\n /**\n * When `true`, object horizontal movement is locked\n * @type Boolean\n * @default\n */\n lockMovementX: false,\n\n /**\n * When `true`, object vertical movement is locked\n * @type Boolean\n * @default\n */\n lockMovementY: false,\n\n /**\n * When `true`, object rotation is locked\n * @type Boolean\n * @default\n */\n lockRotation: false,\n\n /**\n * When `true`, object horizontal scaling is locked\n * @type Boolean\n * @default\n */\n lockScalingX: false,\n\n /**\n * When `true`, object vertical scaling is locked\n * @type Boolean\n * @default\n */\n lockScalingY: false,\n\n /**\n * When `true`, object horizontal skewing is locked\n * @type Boolean\n * @default\n */\n lockSkewingX: false,\n\n /**\n * When `true`, object vertical skewing is locked\n * @type Boolean\n * @default\n */\n lockSkewingY: false,\n\n /**\n * When `true`, object cannot be flipped by scaling into negative values\n * @type Boolean\n * @default\n */\n lockScalingFlip: false,\n\n /**\n * When `true`, object is not exported in OBJECT/JSON\n * @since 1.6.3\n * @type Boolean\n * @default\n */\n excludeFromExport: false,\n\n /**\n * When `true`, object is cached on an additional canvas.\n * When `false`, object is not cached unless necessary ( clipPath )\n * default to true\n * @since 1.7.0\n * @type Boolean\n * @default true\n */\n objectCaching: objectCaching,\n\n /**\n * When `true`, object properties are checked for cache invalidation. In some particular\n * situation you may want this to be disabled ( spray brush, very big, groups)\n * or if your application does not allow you to modify properties for groups child you want\n * to disable it for groups.\n * default to false\n * since 1.7.0\n * @type Boolean\n * @default false\n */\n statefullCache: false,\n\n /**\n * When `true`, cache does not get updated during scaling. The picture will get blocky if scaled\n * too much and will be redrawn with correct details at the end of scaling.\n * this setting is performance and application dependant.\n * default to true\n * since 1.7.0\n * @type Boolean\n * @default true\n */\n noScaleCache: true,\n\n /**\n * When `false`, the stoke width will scale with the object.\n * When `true`, the stroke will always match the exact pixel size entered for stroke width.\n * default to false\n * @since 2.6.0\n * @type Boolean\n * @default false\n * @type Boolean\n * @default false\n */\n strokeUniform: false,\n\n /**\n * When set to `true`, object's cache will be rerendered next render call.\n * since 1.7.0\n * @type Boolean\n * @default true\n */\n dirty: true,\n\n /**\n * keeps the value of the last hovered corner during mouse move.\n * 0 is no corner, or 'mt', 'ml', 'mtr' etc..\n * It should be private, but there is no harm in using it as\n * a read-only property.\n * @type number|string|any\n * @default 0\n */\n __corner: 0,\n\n /**\n * Determines if the fill or the stroke is drawn first (one of \"fill\" or \"stroke\")\n * @type String\n * @default\n */\n paintFirst: 'fill',\n\n /**\n * List of properties to consider when checking if state\n * of an object is changed (fabric.Object#hasStateChanged)\n * as well as for history (undo/redo) purposes\n * @type Array\n */\n stateProperties: (\n 'top left width height scaleX scaleY flipX flipY originX originY transformMatrix ' +\n 'stroke strokeWidth strokeDashArray strokeLineCap strokeDashOffset strokeLineJoin strokeMiterLimit ' +\n 'angle opacity fill globalCompositeOperation shadow visible backgroundColor ' +\n 'skewX skewY fillRule paintFirst clipPath strokeUniform'\n ).split(' '),\n\n /**\n * List of properties to consider when checking if cache needs refresh\n * Those properties are checked by statefullCache ON ( or lazy mode if we want ) or from single\n * calls to Object.set(key, value). If the key is in this list, the object is marked as dirty\n * and refreshed at the next render\n * @type Array\n */\n cacheProperties: (\n 'fill stroke strokeWidth strokeDashArray width height paintFirst strokeUniform' +\n ' strokeLineCap strokeDashOffset strokeLineJoin strokeMiterLimit backgroundColor clipPath'\n ).split(' '),\n\n /**\n * List of properties to consider for animating colors.\n * @type Array\n */\n colorProperties: (\n 'fill stroke backgroundColor'\n ).split(' '),\n\n /**\n * a fabricObject that, without stroke define a clipping area with their shape. filled in black\n * the clipPath object gets used when the object has rendered, and the context is placed in the center\n * of the object cacheCanvas.\n * If you want 0,0 of a clipPath to align with an object center, use clipPath.originX/Y to 'center'\n * @type fabric.Object\n */\n clipPath: undefined,\n\n /**\n * Meaningful ONLY when the object is used as clipPath.\n * if true, the clipPath will make the object clip to the outside of the clipPath\n * since 2.4.0\n * @type boolean\n * @default false\n */\n inverted: false,\n\n /**\n * Meaningful ONLY when the object is used as clipPath.\n * if true, the clipPath will have its top and left relative to canvas, and will\n * not be influenced by the object transform. This will make the clipPath relative\n * to the canvas, but clipping just a particular object.\n * WARNING this is beta, this feature may change or be renamed.\n * since 2.4.0\n * @type boolean\n * @default false\n */\n absolutePositioned: false,\n\n /**\n * Constructor\n * @param {Object} [options] Options object\n */\n initialize: function(options) {\n if (options) {\n this.setOptions(options);\n }\n },\n\n /**\n * Create a the canvas used to keep the cached copy of the object\n * @private\n */\n _createCacheCanvas: function() {\n this._cacheProperties = {};\n this._cacheCanvas = fabric.util.createCanvasElement();\n this._cacheContext = this._cacheCanvas.getContext('2d');\n this._updateCacheCanvas();\n // if canvas gets created, is empty, so dirty.\n this.dirty = true;\n },\n\n /**\n * Limit the cache dimensions so that X * Y do not cross fabric.perfLimitSizeTotal\n * and each side do not cross fabric.cacheSideLimit\n * those numbers are configurable so that you can get as much detail as you want\n * making bargain with performances.\n * @param {Object} dims\n * @param {Object} dims.width width of canvas\n * @param {Object} dims.height height of canvas\n * @param {Object} dims.zoomX zoomX zoom value to unscale the canvas before drawing cache\n * @param {Object} dims.zoomY zoomY zoom value to unscale the canvas before drawing cache\n * @return {Object}.width width of canvas\n * @return {Object}.height height of canvas\n * @return {Object}.zoomX zoomX zoom value to unscale the canvas before drawing cache\n * @return {Object}.zoomY zoomY zoom value to unscale the canvas before drawing cache\n */\n _limitCacheSize: function(dims) {\n var perfLimitSizeTotal = fabric.perfLimitSizeTotal,\n width = dims.width, height = dims.height,\n max = fabric.maxCacheSideLimit, min = fabric.minCacheSideLimit;\n if (width <= max && height <= max && width * height <= perfLimitSizeTotal) {\n if (width < min) {\n dims.width = min;\n }\n if (height < min) {\n dims.height = min;\n }\n return dims;\n }\n var ar = width / height, limitedDims = fabric.util.limitDimsByArea(ar, perfLimitSizeTotal),\n capValue = fabric.util.capValue,\n x = capValue(min, limitedDims.x, max),\n y = capValue(min, limitedDims.y, max);\n if (width > x) {\n dims.zoomX /= width / x;\n dims.width = x;\n dims.capped = true;\n }\n if (height > y) {\n dims.zoomY /= height / y;\n dims.height = y;\n dims.capped = true;\n }\n return dims;\n },\n\n /**\n * Return the dimension and the zoom level needed to create a cache canvas\n * big enough to host the object to be cached.\n * @private\n * @return {Object}.x width of object to be cached\n * @return {Object}.y height of object to be cached\n * @return {Object}.width width of canvas\n * @return {Object}.height height of canvas\n * @return {Object}.zoomX zoomX zoom value to unscale the canvas before drawing cache\n * @return {Object}.zoomY zoomY zoom value to unscale the canvas before drawing cache\n */\n _getCacheCanvasDimensions: function() {\n var objectScale = this.getTotalObjectScaling(),\n // caculate dimensions without skewing\n dim = this._getTransformedDimensions(0, 0),\n neededX = dim.x * objectScale.scaleX / this.scaleX,\n neededY = dim.y * objectScale.scaleY / this.scaleY;\n return {\n // for sure this ALIASING_LIMIT is slightly creating problem\n // in situation in which the cache canvas gets an upper limit\n // also objectScale contains already scaleX and scaleY\n width: neededX + ALIASING_LIMIT,\n height: neededY + ALIASING_LIMIT,\n zoomX: objectScale.scaleX,\n zoomY: objectScale.scaleY,\n x: neededX,\n y: neededY\n };\n },\n\n /**\n * Update width and height of the canvas for cache\n * returns true or false if canvas needed resize.\n * @private\n * @return {Boolean} true if the canvas has been resized\n */\n _updateCacheCanvas: function() {\n var targetCanvas = this.canvas;\n if (this.noScaleCache && targetCanvas && targetCanvas._currentTransform) {\n var target = targetCanvas._currentTransform.target,\n action = targetCanvas._currentTransform.action;\n if (this === target && action.slice && action.slice(0, 5) === 'scale') {\n return false;\n }\n }\n var canvas = this._cacheCanvas,\n dims = this._limitCacheSize(this._getCacheCanvasDimensions()),\n minCacheSize = fabric.minCacheSideLimit,\n width = dims.width, height = dims.height, drawingWidth, drawingHeight,\n zoomX = dims.zoomX, zoomY = dims.zoomY,\n dimensionsChanged = width !== this.cacheWidth || height !== this.cacheHeight,\n zoomChanged = this.zoomX !== zoomX || this.zoomY !== zoomY,\n shouldRedraw = dimensionsChanged || zoomChanged,\n additionalWidth = 0, additionalHeight = 0, shouldResizeCanvas = false;\n if (dimensionsChanged) {\n var canvasWidth = this._cacheCanvas.width,\n canvasHeight = this._cacheCanvas.height,\n sizeGrowing = width > canvasWidth || height > canvasHeight,\n sizeShrinking = (width < canvasWidth * 0.9 || height < canvasHeight * 0.9) &&\n canvasWidth > minCacheSize && canvasHeight > minCacheSize;\n shouldResizeCanvas = sizeGrowing || sizeShrinking;\n if (sizeGrowing && !dims.capped && (width > minCacheSize || height > minCacheSize)) {\n additionalWidth = width * 0.1;\n additionalHeight = height * 0.1;\n }\n }\n if (shouldRedraw) {\n if (shouldResizeCanvas) {\n canvas.width = Math.ceil(width + additionalWidth);\n canvas.height = Math.ceil(height + additionalHeight);\n }\n else {\n this._cacheContext.setTransform(1, 0, 0, 1, 0, 0);\n this._cacheContext.clearRect(0, 0, canvas.width, canvas.height);\n }\n drawingWidth = dims.x / 2;\n drawingHeight = dims.y / 2;\n this.cacheTranslationX = Math.round(canvas.width / 2 - drawingWidth) + drawingWidth;\n this.cacheTranslationY = Math.round(canvas.height / 2 - drawingHeight) + drawingHeight;\n this.cacheWidth = width;\n this.cacheHeight = height;\n this._cacheContext.translate(this.cacheTranslationX, this.cacheTranslationY);\n this._cacheContext.scale(zoomX, zoomY);\n this.zoomX = zoomX;\n this.zoomY = zoomY;\n return true;\n }\n return false;\n },\n\n /**\n * Sets object's properties from options\n * @param {Object} [options] Options object\n */\n setOptions: function(options) {\n this._setOptions(options);\n this._initGradient(options.fill, 'fill');\n this._initGradient(options.stroke, 'stroke');\n this._initPattern(options.fill, 'fill');\n this._initPattern(options.stroke, 'stroke');\n },\n\n /**\n * Transforms context when rendering an object\n * @param {CanvasRenderingContext2D} ctx Context\n */\n transform: function(ctx) {\n var needFullTransform = (this.group && !this.group._transformDone) ||\n (this.group && this.canvas && ctx === this.canvas.contextTop);\n var m = this.calcTransformMatrix(!needFullTransform);\n ctx.transform(m[0], m[1], m[2], m[3], m[4], m[5]);\n },\n\n /**\n * Returns an object representation of an instance\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} Object representation of an instance\n */\n toObject: function(propertiesToInclude) {\n var NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS,\n\n object = {\n type: this.type,\n version: fabric.version,\n originX: this.originX,\n originY: this.originY,\n left: toFixed(this.left, NUM_FRACTION_DIGITS),\n top: toFixed(this.top, NUM_FRACTION_DIGITS),\n width: toFixed(this.width, NUM_FRACTION_DIGITS),\n height: toFixed(this.height, NUM_FRACTION_DIGITS),\n fill: (this.fill && this.fill.toObject) ? this.fill.toObject() : this.fill,\n stroke: (this.stroke && this.stroke.toObject) ? this.stroke.toObject() : this.stroke,\n strokeWidth: toFixed(this.strokeWidth, NUM_FRACTION_DIGITS),\n strokeDashArray: this.strokeDashArray ? this.strokeDashArray.concat() : this.strokeDashArray,\n strokeLineCap: this.strokeLineCap,\n strokeDashOffset: this.strokeDashOffset,\n strokeLineJoin: this.strokeLineJoin,\n // strokeUniform: this.strokeUniform,\n strokeMiterLimit: toFixed(this.strokeMiterLimit, NUM_FRACTION_DIGITS),\n scaleX: toFixed(this.scaleX, NUM_FRACTION_DIGITS),\n scaleY: toFixed(this.scaleY, NUM_FRACTION_DIGITS),\n angle: toFixed(this.angle, NUM_FRACTION_DIGITS),\n flipX: this.flipX,\n flipY: this.flipY,\n opacity: toFixed(this.opacity, NUM_FRACTION_DIGITS),\n shadow: (this.shadow && this.shadow.toObject) ? this.shadow.toObject() : this.shadow,\n visible: this.visible,\n backgroundColor: this.backgroundColor,\n fillRule: this.fillRule,\n paintFirst: this.paintFirst,\n globalCompositeOperation: this.globalCompositeOperation,\n skewX: toFixed(this.skewX, NUM_FRACTION_DIGITS),\n skewY: toFixed(this.skewY, NUM_FRACTION_DIGITS),\n };\n\n if (this.clipPath) {\n object.clipPath = this.clipPath.toObject(propertiesToInclude);\n object.clipPath.inverted = this.clipPath.inverted;\n object.clipPath.absolutePositioned = this.clipPath.absolutePositioned;\n }\n\n fabric.util.populateWithProperties(this, object, propertiesToInclude);\n if (!this.includeDefaultValues) {\n object = this._removeDefaultValues(object);\n }\n\n return object;\n },\n\n /**\n * Returns (dataless) object representation of an instance\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} Object representation of an instance\n */\n toDatalessObject: function(propertiesToInclude) {\n // will be overwritten by subclasses\n return this.toObject(propertiesToInclude);\n },\n\n /**\n * @private\n * @param {Object} object\n */\n _removeDefaultValues: function(object) {\n var prototype = fabric.util.getKlass(object.type).prototype,\n stateProperties = prototype.stateProperties;\n stateProperties.forEach(function(prop) {\n if (prop === 'left' || prop === 'top') {\n return;\n }\n if (object[prop] === prototype[prop]) {\n delete object[prop];\n }\n var isArray = Object.prototype.toString.call(object[prop]) === '[object Array]' &&\n Object.prototype.toString.call(prototype[prop]) === '[object Array]';\n\n // basically a check for [] === []\n if (isArray && object[prop].length === 0 && prototype[prop].length === 0) {\n delete object[prop];\n }\n });\n\n return object;\n },\n\n /**\n * Returns a string representation of an instance\n * @return {String}\n */\n toString: function() {\n return '#<fabric.' + capitalize(this.type) + '>';\n },\n\n /**\n * Return the object scale factor counting also the group scaling\n * @return {Object} object with scaleX and scaleY properties\n */\n getObjectScaling: function() {\n var options = fabric.util.qrDecompose(this.calcTransformMatrix());\n return { scaleX: Math.abs(options.scaleX), scaleY: Math.abs(options.scaleY) };\n },\n\n /**\n * Return the object scale factor counting also the group scaling, zoom and retina\n * @return {Object} object with scaleX and scaleY properties\n */\n getTotalObjectScaling: function() {\n var scale = this.getObjectScaling(), scaleX = scale.scaleX, scaleY = scale.scaleY;\n if (this.canvas) {\n var zoom = this.canvas.getZoom();\n var retina = this.canvas.getRetinaScaling();\n scaleX *= zoom * retina;\n scaleY *= zoom * retina;\n }\n return { scaleX: scaleX, scaleY: scaleY };\n },\n\n /**\n * Return the object opacity counting also the group property\n * @return {Number}\n */\n getObjectOpacity: function() {\n var opacity = this.opacity;\n if (this.group) {\n opacity *= this.group.getObjectOpacity();\n }\n return opacity;\n },\n\n /**\n * @private\n * @param {String} key\n * @param {*} value\n * @return {fabric.Object} thisArg\n */\n _set: function(key, value) {\n var shouldConstrainValue = (key === 'scaleX' || key === 'scaleY'),\n isChanged = this[key] !== value, groupNeedsUpdate = false;\n\n if (shouldConstrainValue) {\n value = this._constrainScale(value);\n }\n if (key === 'scaleX' && value < 0) {\n this.flipX = !this.flipX;\n value *= -1;\n }\n else if (key === 'scaleY' && value < 0) {\n this.flipY = !this.flipY;\n value *= -1;\n }\n else if (key === 'shadow' && value && !(value instanceof fabric.Shadow)) {\n value = new fabric.Shadow(value);\n }\n else if (key === 'dirty' && this.group) {\n this.group.set('dirty', value);\n }\n\n this[key] = value;\n\n if (isChanged) {\n groupNeedsUpdate = this.group && this.group.isOnACache();\n if (this.cacheProperties.indexOf(key) > -1) {\n this.dirty = true;\n groupNeedsUpdate && this.group.set('dirty', true);\n }\n else if (groupNeedsUpdate && this.stateProperties.indexOf(key) > -1) {\n this.group.set('dirty', true);\n }\n }\n\n return this;\n },\n\n /**\n * This callback function is called by the parent group of an object every\n * time a non-delegated property changes on the group. It is passed the key\n * and value as parameters. Not adding in this function's signature to avoid\n * Travis build error about unused variables.\n */\n setOnGroup: function() {\n // implemented by sub-classes, as needed.\n },\n\n /**\n * Retrieves viewportTransform from Object's canvas if possible\n * @method getViewportTransform\n * @memberOf fabric.Object.prototype\n * @return {Array}\n */\n getViewportTransform: function() {\n if (this.canvas && this.canvas.viewportTransform) {\n return this.canvas.viewportTransform;\n }\n return fabric.iMatrix.concat();\n },\n\n /*\n * @private\n * return if the object would be visible in rendering\n * @memberOf fabric.Object.prototype\n * @return {Boolean}\n */\n isNotVisible: function() {\n return this.opacity === 0 ||\n (!this.width && !this.height && this.strokeWidth === 0) ||\n !this.visible;\n },\n\n /**\n * Renders an object on a specified context\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n render: function(ctx) {\n // do not render if width/height are zeros or object is not visible\n if (this.isNotVisible()) {\n return;\n }\n if (this.canvas && this.canvas.skipOffscreen && !this.group && !this.isOnScreen()) {\n return;\n }\n ctx.save();\n this._setupCompositeOperation(ctx);\n this.drawSelectionBackground(ctx);\n this.transform(ctx);\n this._setOpacity(ctx);\n this._setShadow(ctx, this);\n if (this.shouldCache()) {\n this.renderCache();\n this.drawCacheOnCanvas(ctx);\n }\n else {\n this._removeCacheCanvas();\n this.dirty = false;\n this.drawObject(ctx);\n if (this.objectCaching && this.statefullCache) {\n this.saveState({ propertySet: 'cacheProperties' });\n }\n }\n ctx.restore();\n },\n\n renderCache: function(options) {\n options = options || {};\n if (!this._cacheCanvas) {\n this._createCacheCanvas();\n }\n if (this.isCacheDirty()) {\n this.statefullCache && this.saveState({ propertySet: 'cacheProperties' });\n this.drawObject(this._cacheContext, options.forClipping);\n this.dirty = false;\n }\n },\n\n /**\n * Remove cacheCanvas and its dimensions from the objects\n */\n _removeCacheCanvas: function() {\n this._cacheCanvas = null;\n this.cacheWidth = 0;\n this.cacheHeight = 0;\n },\n\n /**\n * return true if the object will draw a stroke\n * Does not consider text styles. This is just a shortcut used at rendering time\n * We want it to be an aproximation and be fast.\n * wrote to avoid extra caching, it has to return true when stroke happens,\n * can guess when it will not happen at 100% chance, does not matter if it misses\n * some use case where the stroke is invisible.\n * @since 3.0.0\n * @returns Boolean\n */\n hasStroke: function() {\n return this.stroke && this.stroke !== 'transparent' && this.strokeWidth !== 0;\n },\n\n /**\n * return true if the object will draw a fill\n * Does not consider text styles. This is just a shortcut used at rendering time\n * We want it to be an aproximation and be fast.\n * wrote to avoid extra caching, it has to return true when fill happens,\n * can guess when it will not happen at 100% chance, does not matter if it misses\n * some use case where the fill is invisible.\n * @since 3.0.0\n * @returns Boolean\n */\n hasFill: function() {\n return this.fill && this.fill !== 'transparent';\n },\n\n /**\n * When set to `true`, force the object to have its own cache, even if it is inside a group\n * it may be needed when your object behave in a particular way on the cache and always needs\n * its own isolated canvas to render correctly.\n * Created to be overridden\n * since 1.7.12\n * @returns Boolean\n */\n needsItsOwnCache: function() {\n if (this.paintFirst === 'stroke' &&\n this.hasFill() && this.hasStroke() && typeof this.shadow === 'object') {\n return true;\n }\n if (this.clipPath) {\n return true;\n }\n return false;\n },\n\n /**\n * Decide if the object should cache or not. Create its own cache level\n * objectCaching is a global flag, wins over everything\n * needsItsOwnCache should be used when the object drawing method requires\n * a cache step. None of the fabric classes requires it.\n * Generally you do not cache objects in groups because the group outside is cached.\n * Read as: cache if is needed, or if the feature is enabled but we are not already caching.\n * @return {Boolean}\n */\n shouldCache: function() {\n this.ownCaching = this.needsItsOwnCache() || (\n this.objectCaching &&\n (!this.group || !this.group.isOnACache())\n );\n return this.ownCaching;\n },\n\n /**\n * Check if this object or a child object will cast a shadow\n * used by Group.shouldCache to know if child has a shadow recursively\n * @return {Boolean}\n */\n willDrawShadow: function() {\n return !!this.shadow && (this.shadow.offsetX !== 0 || this.shadow.offsetY !== 0);\n },\n\n /**\n * Execute the drawing operation for an object clipPath\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n drawClipPathOnCache: function(ctx) {\n var path = this.clipPath;\n ctx.save();\n // DEBUG: uncomment this line, comment the following\n // ctx.globalAlpha = 0.4\n if (path.inverted) {\n ctx.globalCompositeOperation = 'destination-out';\n }\n else {\n ctx.globalCompositeOperation = 'destination-in';\n }\n //ctx.scale(1 / 2, 1 / 2);\n if (path.absolutePositioned) {\n var m = fabric.util.invertTransform(this.calcTransformMatrix());\n ctx.transform(m[0], m[1], m[2], m[3], m[4], m[5]);\n }\n path.transform(ctx);\n ctx.scale(1 / path.zoomX, 1 / path.zoomY);\n ctx.drawImage(path._cacheCanvas, -path.cacheTranslationX, -path.cacheTranslationY);\n ctx.restore();\n },\n\n /**\n * Execute the drawing operation for an object on a specified context\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n drawObject: function(ctx, forClipping) {\n var originalFill = this.fill, originalStroke = this.stroke;\n if (forClipping) {\n this.fill = 'black';\n this.stroke = '';\n this._setClippingProperties(ctx);\n }\n else {\n this._renderBackground(ctx);\n this._setStrokeStyles(ctx, this);\n this._setFillStyles(ctx, this);\n }\n this._render(ctx);\n this._drawClipPath(ctx);\n this.fill = originalFill;\n this.stroke = originalStroke;\n },\n\n _drawClipPath: function(ctx) {\n var path = this.clipPath;\n if (!path) { return; }\n // needed to setup a couple of variables\n // path canvas gets overridden with this one.\n // TODO find a better solution?\n path.canvas = this.canvas;\n path.shouldCache();\n path._transformDone = true;\n path.renderCache({ forClipping: true });\n this.drawClipPathOnCache(ctx);\n },\n\n /**\n * Paint the cached copy of the object on the target context.\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n drawCacheOnCanvas: function(ctx) {\n ctx.scale(1 / this.zoomX, 1 / this.zoomY);\n ctx.drawImage(this._cacheCanvas, -this.cacheTranslationX, -this.cacheTranslationY);\n },\n\n /**\n * Check if cache is dirty\n * @param {Boolean} skipCanvas skip canvas checks because this object is painted\n * on parent canvas.\n */\n isCacheDirty: function(skipCanvas) {\n if (this.isNotVisible()) {\n return false;\n }\n if (this._cacheCanvas && !skipCanvas && this._updateCacheCanvas()) {\n // in this case the context is already cleared.\n return true;\n }\n else {\n if (this.dirty ||\n (this.clipPath && this.clipPath.absolutePositioned) ||\n (this.statefullCache && this.hasStateChanged('cacheProperties'))\n ) {\n if (this._cacheCanvas && !skipCanvas) {\n var width = this.cacheWidth / this.zoomX;\n var height = this.cacheHeight / this.zoomY;\n this._cacheContext.clearRect(-width / 2, -height / 2, width, height);\n }\n return true;\n }\n }\n return false;\n },\n\n /**\n * Draws a background for the object big as its untransformed dimensions\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderBackground: function(ctx) {\n if (!this.backgroundColor) {\n return;\n }\n var dim = this._getNonTransformedDimensions();\n ctx.fillStyle = this.backgroundColor;\n\n ctx.fillRect(\n -dim.x / 2,\n -dim.y / 2,\n dim.x,\n dim.y\n );\n // if there is background color no other shadows\n // should be casted\n this._removeShadow(ctx);\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _setOpacity: function(ctx) {\n if (this.group && !this.group._transformDone) {\n ctx.globalAlpha = this.getObjectOpacity();\n }\n else {\n ctx.globalAlpha *= this.opacity;\n }\n },\n\n _setStrokeStyles: function(ctx, decl) {\n if (decl.stroke) {\n ctx.lineWidth = decl.strokeWidth;\n ctx.lineCap = decl.strokeLineCap;\n ctx.lineDashOffset = decl.strokeDashOffset;\n ctx.lineJoin = decl.strokeLineJoin;\n ctx.miterLimit = decl.strokeMiterLimit;\n ctx.strokeStyle = decl.stroke.toLive\n ? decl.stroke.toLive(ctx, this)\n : decl.stroke;\n }\n },\n\n _setFillStyles: function(ctx, decl) {\n if (decl.fill) {\n ctx.fillStyle = decl.fill.toLive\n ? decl.fill.toLive(ctx, this)\n : decl.fill;\n }\n },\n\n _setClippingProperties: function(ctx) {\n ctx.globalAlpha = 1;\n ctx.strokeStyle = 'transparent';\n ctx.fillStyle = '#000000';\n },\n\n /**\n * @private\n * Sets line dash\n * @param {CanvasRenderingContext2D} ctx Context to set the dash line on\n * @param {Array} dashArray array representing dashes\n * @param {Function} alternative function to call if browser does not support lineDash\n */\n _setLineDash: function(ctx, dashArray, alternative) {\n if (!dashArray || dashArray.length === 0) {\n return;\n }\n // Spec requires the concatenation of two copies the dash list when the number of elements is odd\n if (1 & dashArray.length) {\n dashArray.push.apply(dashArray, dashArray);\n }\n if (supportsLineDash) {\n ctx.setLineDash(dashArray);\n }\n else {\n alternative && alternative(ctx);\n }\n },\n\n /**\n * Renders controls and borders for the object\n * @param {CanvasRenderingContext2D} ctx Context to render on\n * @param {Object} [styleOverride] properties to override the object style\n */\n _renderControls: function(ctx, styleOverride) {\n var vpt = this.getViewportTransform(),\n matrix = this.calcTransformMatrix(),\n options, drawBorders, drawControls;\n styleOverride = styleOverride || { };\n drawBorders = typeof styleOverride.hasBorders !== 'undefined' ? styleOverride.hasBorders : this.hasBorders;\n drawControls = typeof styleOverride.hasControls !== 'undefined' ? styleOverride.hasControls : this.hasControls;\n matrix = fabric.util.multiplyTransformMatrices(vpt, matrix);\n options = fabric.util.qrDecompose(matrix);\n ctx.save();\n ctx.translate(options.translateX, options.translateY);\n ctx.lineWidth = 1 * this.borderScaleFactor;\n if (!this.group) {\n ctx.globalAlpha = this.isMoving ? this.borderOpacityWhenMoving : 1;\n }\n if (styleOverride.forActiveSelection) {\n ctx.rotate(degreesToRadians(options.angle));\n drawBorders && this.drawBordersInGroup(ctx, options, styleOverride);\n }\n else {\n ctx.rotate(degreesToRadians(this.angle));\n drawBorders && this.drawBorders(ctx, styleOverride);\n }\n drawControls && this.drawControls(ctx, styleOverride);\n ctx.restore();\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _setShadow: function(ctx) {\n if (!this.shadow) {\n return;\n }\n\n var shadow = this.shadow, canvas = this.canvas, scaling,\n multX = (canvas && canvas.viewportTransform[0]) || 1,\n multY = (canvas && canvas.viewportTransform[3]) || 1;\n if (shadow.nonScaling) {\n scaling = { scaleX: 1, scaleY: 1 };\n }\n else {\n scaling = this.getObjectScaling();\n }\n if (canvas && canvas._isRetinaScaling()) {\n multX *= fabric.devicePixelRatio;\n multY *= fabric.devicePixelRatio;\n }\n ctx.shadowColor = shadow.color;\n ctx.shadowBlur = shadow.blur * fabric.browserShadowBlurConstant *\n (multX + multY) * (scaling.scaleX + scaling.scaleY) / 4;\n ctx.shadowOffsetX = shadow.offsetX * multX * scaling.scaleX;\n ctx.shadowOffsetY = shadow.offsetY * multY * scaling.scaleY;\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _removeShadow: function(ctx) {\n if (!this.shadow) {\n return;\n }\n\n ctx.shadowColor = '';\n ctx.shadowBlur = ctx.shadowOffsetX = ctx.shadowOffsetY = 0;\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n * @param {Object} filler fabric.Pattern or fabric.Gradient\n * @return {Object} offset.offsetX offset for text rendering\n * @return {Object} offset.offsetY offset for text rendering\n */\n _applyPatternGradientTransform: function(ctx, filler) {\n if (!filler || !filler.toLive) {\n return { offsetX: 0, offsetY: 0 };\n }\n var t = filler.gradientTransform || filler.patternTransform;\n var offsetX = -this.width / 2 + filler.offsetX || 0,\n offsetY = -this.height / 2 + filler.offsetY || 0;\n\n if (filler.gradientUnits === 'percentage') {\n ctx.transform(this.width, 0, 0, this.height, offsetX, offsetY);\n }\n else {\n ctx.transform(1, 0, 0, 1, offsetX, offsetY);\n }\n if (t) {\n ctx.transform(t[0], t[1], t[2], t[3], t[4], t[5]);\n }\n return { offsetX: offsetX, offsetY: offsetY };\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderPaintInOrder: function(ctx) {\n if (this.paintFirst === 'stroke') {\n this._renderStroke(ctx);\n this._renderFill(ctx);\n }\n else {\n this._renderFill(ctx);\n this._renderStroke(ctx);\n }\n },\n\n /**\n * @private\n * function that actually render something on the context.\n * empty here to allow Obects to work on tests to benchmark fabric functionalites\n * not related to rendering\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _render: function(/* ctx */) {\n\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderFill: function(ctx) {\n if (!this.fill) {\n return;\n }\n\n ctx.save();\n this._applyPatternGradientTransform(ctx, this.fill);\n if (this.fillRule === 'evenodd') {\n ctx.fill('evenodd');\n }\n else {\n ctx.fill();\n }\n ctx.restore();\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderStroke: function(ctx) {\n if (!this.stroke || this.strokeWidth === 0) {\n return;\n }\n\n if (this.shadow && !this.shadow.affectStroke) {\n this._removeShadow(ctx);\n }\n\n ctx.save();\n if (this.strokeUniform && this.group) {\n var scaling = this.getObjectScaling();\n ctx.scale(1 / scaling.scaleX, 1 / scaling.scaleY);\n }\n else if (this.strokeUniform) {\n ctx.scale(1 / this.scaleX, 1 / this.scaleY);\n }\n this._setLineDash(ctx, this.strokeDashArray, this._renderDashedStroke);\n if (this.stroke.toLive && this.stroke.gradientUnits === 'percentage') {\n // need to transform gradient in a pattern.\n // this is a slow process. If you are hitting this codepath, and the object\n // is not using caching, you should consider switching it on.\n // we need a canvas as big as the current object caching canvas.\n this._applyPatternForTransformedGradient(ctx, this.stroke);\n }\n else {\n this._applyPatternGradientTransform(ctx, this.stroke);\n }\n ctx.stroke();\n ctx.restore();\n },\n\n /**\n * This function try to patch the missing gradientTransform on canvas gradients.\n * transforming a context to transform the gradient, is going to transform the stroke too.\n * we want to transform the gradient but not the stroke operation, so we create\n * a transformed gradient on a pattern and then we use the pattern instead of the gradient.\n * this method has drwabacks: is slow, is in low resolution, needs a patch for when the size\n * is limited.\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n * @param {fabric.Gradient} filler a fabric gradient instance\n */\n _applyPatternForTransformedGradient: function(ctx, filler) {\n var dims = this._limitCacheSize(this._getCacheCanvasDimensions()),\n pCanvas = fabric.util.createCanvasElement(), pCtx, retinaScaling = this.canvas.getRetinaScaling(),\n width = dims.x / this.scaleX / retinaScaling, height = dims.y / this.scaleY / retinaScaling;\n pCanvas.width = width;\n pCanvas.height = height;\n pCtx = pCanvas.getContext('2d');\n pCtx.beginPath(); pCtx.moveTo(0, 0); pCtx.lineTo(width, 0); pCtx.lineTo(width, height);\n pCtx.lineTo(0, height); pCtx.closePath();\n pCtx.translate(width / 2, height / 2);\n pCtx.scale(\n dims.zoomX / this.scaleX / retinaScaling,\n dims.zoomY / this.scaleY / retinaScaling\n );\n this._applyPatternGradientTransform(pCtx, filler);\n pCtx.fillStyle = filler.toLive(ctx);\n pCtx.fill();\n ctx.translate(-this.width / 2 - this.strokeWidth / 2, -this.height / 2 - this.strokeWidth / 2);\n ctx.scale(\n retinaScaling * this.scaleX / dims.zoomX,\n retinaScaling * this.scaleY / dims.zoomY\n );\n ctx.strokeStyle = pCtx.createPattern(pCanvas, 'no-repeat');\n },\n\n /**\n * This function is an helper for svg import. it returns the center of the object in the svg\n * untransformed coordinates\n * @private\n * @return {Object} center point from element coordinates\n */\n _findCenterFromElement: function() {\n return { x: this.left + this.width / 2, y: this.top + this.height / 2 };\n },\n\n /**\n * This function is an helper for svg import. it decompose the transformMatrix\n * and assign properties to object.\n * untransformed coordinates\n * @private\n * @chainable\n */\n _assignTransformMatrixProps: function() {\n if (this.transformMatrix) {\n var options = fabric.util.qrDecompose(this.transformMatrix);\n this.flipX = false;\n this.flipY = false;\n this.set('scaleX', options.scaleX);\n this.set('scaleY', options.scaleY);\n this.angle = options.angle;\n this.skewX = options.skewX;\n this.skewY = 0;\n }\n },\n\n /**\n * This function is an helper for svg import. it removes the transform matrix\n * and set to object properties that fabricjs can handle\n * @private\n * @param {Object} preserveAspectRatioOptions\n * @return {thisArg}\n */\n _removeTransformMatrix: function(preserveAspectRatioOptions) {\n var center = this._findCenterFromElement();\n if (this.transformMatrix) {\n this._assignTransformMatrixProps();\n center = fabric.util.transformPoint(center, this.transformMatrix);\n }\n this.transformMatrix = null;\n if (preserveAspectRatioOptions) {\n this.scaleX *= preserveAspectRatioOptions.scaleX;\n this.scaleY *= preserveAspectRatioOptions.scaleY;\n this.cropX = preserveAspectRatioOptions.cropX;\n this.cropY = preserveAspectRatioOptions.cropY;\n center.x += preserveAspectRatioOptions.offsetLeft;\n center.y += preserveAspectRatioOptions.offsetTop;\n this.width = preserveAspectRatioOptions.width;\n this.height = preserveAspectRatioOptions.height;\n }\n this.setPositionByOrigin(center, 'center', 'center');\n },\n\n /**\n * Clones an instance, using a callback method will work for every object.\n * @param {Function} callback Callback is invoked with a clone as a first argument\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n */\n clone: function(callback, propertiesToInclude) {\n var objectForm = this.toObject(propertiesToInclude);\n if (this.constructor.fromObject) {\n this.constructor.fromObject(objectForm, callback);\n }\n else {\n fabric.Object._fromObject('Object', objectForm, callback);\n }\n },\n\n /**\n * Creates an instance of fabric.Image out of an object\n * could make use of both toDataUrl or toCanvasElement.\n * @param {Function} callback callback, invoked with an instance as a first argument\n * @param {Object} [options] for clone as image, passed to toDataURL\n * @param {String} [options.format=png] The format of the output image. Either \"jpeg\" or \"png\"\n * @param {Number} [options.quality=1] Quality level (0..1). Only used for jpeg.\n * @param {Number} [options.multiplier=1] Multiplier to scale by\n * @param {Number} [options.left] Cropping left offset. Introduced in v1.2.14\n * @param {Number} [options.top] Cropping top offset. Introduced in v1.2.14\n * @param {Number} [options.width] Cropping width. Introduced in v1.2.14\n * @param {Number} [options.height] Cropping height. Introduced in v1.2.14\n * @param {Boolean} [options.enableRetinaScaling] Enable retina scaling for clone image. Introduce in 1.6.4\n * @param {Boolean} [options.withoutTransform] Remove current object transform ( no scale , no angle, no flip, no skew ). Introduced in 2.3.4\n * @param {Boolean} [options.withoutShadow] Remove current object shadow. Introduced in 2.4.2\n * @return {fabric.Object} thisArg\n */\n cloneAsImage: function(callback, options) {\n var canvasEl = this.toCanvasElement(options);\n if (callback) {\n callback(new fabric.Image(canvasEl));\n }\n return this;\n },\n\n /**\n * Converts an object into a HTMLCanvas element\n * @param {Object} options Options object\n * @param {Number} [options.multiplier=1] Multiplier to scale by\n * @param {Number} [options.left] Cropping left offset. Introduced in v1.2.14\n * @param {Number} [options.top] Cropping top offset. Introduced in v1.2.14\n * @param {Number} [options.width] Cropping width. Introduced in v1.2.14\n * @param {Number} [options.height] Cropping height. Introduced in v1.2.14\n * @param {Boolean} [options.enableRetinaScaling] Enable retina scaling for clone image. Introduce in 1.6.4\n * @param {Boolean} [options.withoutTransform] Remove current object transform ( no scale , no angle, no flip, no skew ). Introduced in 2.3.4\n * @param {Boolean} [options.withoutShadow] Remove current object shadow. Introduced in 2.4.2\n * @return {HTMLCanvasElement} Returns DOM element <canvas> with the fabric.Object\n */\n toCanvasElement: function(options) {\n options || (options = { });\n\n var utils = fabric.util, origParams = utils.saveObjectTransform(this),\n originalGroup = this.group,\n originalShadow = this.shadow, abs = Math.abs,\n multiplier = (options.multiplier || 1) * (options.enableRetinaScaling ? fabric.devicePixelRatio : 1);\n delete this.group;\n if (options.withoutTransform) {\n utils.resetObjectTransform(this);\n }\n if (options.withoutShadow) {\n this.shadow = null;\n }\n\n var el = fabric.util.createCanvasElement(),\n // skip canvas zoom and calculate with setCoords now.\n boundingRect = this.getBoundingRect(true, true),\n shadow = this.shadow, scaling,\n shadowOffset = { x: 0, y: 0 }, shadowBlur,\n width, height;\n\n if (shadow) {\n shadowBlur = shadow.blur;\n if (shadow.nonScaling) {\n scaling = { scaleX: 1, scaleY: 1 };\n }\n else {\n scaling = this.getObjectScaling();\n }\n // consider non scaling shadow.\n shadowOffset.x = 2 * Math.round(abs(shadow.offsetX) + shadowBlur) * (abs(scaling.scaleX));\n shadowOffset.y = 2 * Math.round(abs(shadow.offsetY) + shadowBlur) * (abs(scaling.scaleY));\n }\n width = boundingRect.width + shadowOffset.x;\n height = boundingRect.height + shadowOffset.y;\n // if the current width/height is not an integer\n // we need to make it so.\n el.width = Math.ceil(width);\n el.height = Math.ceil(height);\n var canvas = new fabric.StaticCanvas(el, {\n enableRetinaScaling: false,\n renderOnAddRemove: false,\n skipOffscreen: false,\n });\n if (options.format === 'jpeg') {\n canvas.backgroundColor = '#fff';\n }\n this.setPositionByOrigin(new fabric.Point(canvas.width / 2, canvas.height / 2), 'center', 'center');\n\n var originalCanvas = this.canvas;\n canvas.add(this);\n var canvasEl = canvas.toCanvasElement(multiplier || 1, options);\n this.shadow = originalShadow;\n this.set('canvas', originalCanvas);\n if (originalGroup) {\n this.group = originalGroup;\n }\n this.set(origParams).setCoords();\n // canvas.dispose will call image.dispose that will nullify the elements\n // since this canvas is a simple element for the process, we remove references\n // to objects in this way in order to avoid object trashing.\n canvas._objects = [];\n canvas.dispose();\n canvas = null;\n\n return canvasEl;\n },\n\n /**\n * Converts an object into a data-url-like string\n * @param {Object} options Options object\n * @param {String} [options.format=png] The format of the output image. Either \"jpeg\" or \"png\"\n * @param {Number} [options.quality=1] Quality level (0..1). Only used for jpeg.\n * @param {Number} [options.multiplier=1] Multiplier to scale by\n * @param {Number} [options.left] Cropping left offset. Introduced in v1.2.14\n * @param {Number} [options.top] Cropping top offset. Introduced in v1.2.14\n * @param {Number} [options.width] Cropping width. Introduced in v1.2.14\n * @param {Number} [options.height] Cropping height. Introduced in v1.2.14\n * @param {Boolean} [options.enableRetinaScaling] Enable retina scaling for clone image. Introduce in 1.6.4\n * @param {Boolean} [options.withoutTransform] Remove current object transform ( no scale , no angle, no flip, no skew ). Introduced in 2.3.4\n * @param {Boolean} [options.withoutShadow] Remove current object shadow. Introduced in 2.4.2\n * @return {String} Returns a data: URL containing a representation of the object in the format specified by options.format\n */\n toDataURL: function(options) {\n options || (options = { });\n return fabric.util.toDataURL(this.toCanvasElement(options), options.format || 'png', options.quality || 1);\n },\n\n /**\n * Returns true if specified type is identical to the type of an instance\n * @param {String} type Type to check against\n * @return {Boolean}\n */\n isType: function(type) {\n return this.type === type;\n },\n\n /**\n * Returns complexity of an instance\n * @return {Number} complexity of this instance (is 1 unless subclassed)\n */\n complexity: function() {\n return 1;\n },\n\n /**\n * Returns a JSON representation of an instance\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} JSON\n */\n toJSON: function(propertiesToInclude) {\n // delegate, not alias\n return this.toObject(propertiesToInclude);\n },\n\n /**\n * Sets \"angle\" of an instance with centered rotation\n * @param {Number} angle Angle value (in degrees)\n * @return {fabric.Object} thisArg\n * @chainable\n */\n rotate: function(angle) {\n var shouldCenterOrigin = (this.originX !== 'center' || this.originY !== 'center') && this.centeredRotation;\n\n if (shouldCenterOrigin) {\n this._setOriginToCenter();\n }\n\n this.set('angle', angle);\n\n if (shouldCenterOrigin) {\n this._resetOrigin();\n }\n\n return this;\n },\n\n /**\n * Centers object horizontally on canvas to which it was added last.\n * You might need to call `setCoords` on an object after centering, to update controls area.\n * @return {fabric.Object} thisArg\n * @chainable\n */\n centerH: function () {\n this.canvas && this.canvas.centerObjectH(this);\n return this;\n },\n\n /**\n * Centers object horizontally on current viewport of canvas to which it was added last.\n * You might need to call `setCoords` on an object after centering, to update controls area.\n * @return {fabric.Object} thisArg\n * @chainable\n */\n viewportCenterH: function () {\n this.canvas && this.canvas.viewportCenterObjectH(this);\n return this;\n },\n\n /**\n * Centers object vertically on canvas to which it was added last.\n * You might need to call `setCoords` on an object after centering, to update controls area.\n * @return {fabric.Object} thisArg\n * @chainable\n */\n centerV: function () {\n this.canvas && this.canvas.centerObjectV(this);\n return this;\n },\n\n /**\n * Centers object vertically on current viewport of canvas to which it was added last.\n * You might need to call `setCoords` on an object after centering, to update controls area.\n * @return {fabric.Object} thisArg\n * @chainable\n */\n viewportCenterV: function () {\n this.canvas && this.canvas.viewportCenterObjectV(this);\n return this;\n },\n\n /**\n * Centers object vertically and horizontally on canvas to which is was added last\n * You might need to call `setCoords` on an object after centering, to update controls area.\n * @return {fabric.Object} thisArg\n * @chainable\n */\n center: function () {\n this.canvas && this.canvas.centerObject(this);\n return this;\n },\n\n /**\n * Centers object on current viewport of canvas to which it was added last.\n * You might need to call `setCoords` on an object after centering, to update controls area.\n * @return {fabric.Object} thisArg\n * @chainable\n */\n viewportCenter: function () {\n this.canvas && this.canvas.viewportCenterObject(this);\n return this;\n },\n\n /**\n * Returns coordinates of a pointer relative to an object\n * @param {Event} e Event to operate upon\n * @param {Object} [pointer] Pointer to operate upon (instead of event)\n * @return {Object} Coordinates of a pointer (x, y)\n */\n getLocalPointer: function(e, pointer) {\n pointer = pointer || this.canvas.getPointer(e);\n var pClicked = new fabric.Point(pointer.x, pointer.y),\n objectLeftTop = this._getLeftTopCoords();\n if (this.angle) {\n pClicked = fabric.util.rotatePoint(\n pClicked, objectLeftTop, degreesToRadians(-this.angle));\n }\n return {\n x: pClicked.x - objectLeftTop.x,\n y: pClicked.y - objectLeftTop.y\n };\n },\n\n /**\n * Sets canvas globalCompositeOperation for specific object\n * custom composition operation for the particular object can be specified using globalCompositeOperation property\n * @param {CanvasRenderingContext2D} ctx Rendering canvas context\n */\n _setupCompositeOperation: function (ctx) {\n if (this.globalCompositeOperation) {\n ctx.globalCompositeOperation = this.globalCompositeOperation;\n }\n }\n });\n\n fabric.util.createAccessors && fabric.util.createAccessors(fabric.Object);\n\n extend(fabric.Object.prototype, fabric.Observable);\n\n /**\n * Defines the number of fraction digits to use when serializing object values.\n * You can use it to increase/decrease precision of such values like left, top, scaleX, scaleY, etc.\n * @static\n * @memberOf fabric.Object\n * @constant\n * @type Number\n */\n fabric.Object.NUM_FRACTION_DIGITS = 2;\n\n fabric.Object._fromObject = function(className, object, callback, extraParam) {\n var klass = fabric[className];\n object = clone(object, true);\n fabric.util.enlivenPatterns([object.fill, object.stroke], function(patterns) {\n if (typeof patterns[0] !== 'undefined') {\n object.fill = patterns[0];\n }\n if (typeof patterns[1] !== 'undefined') {\n object.stroke = patterns[1];\n }\n fabric.util.enlivenObjects([object.clipPath], function(enlivedProps) {\n object.clipPath = enlivedProps[0];\n var instance = extraParam ? new klass(object[extraParam], object) : new klass(object);\n callback && callback(instance);\n });\n });\n };\n\n /**\n * Unique id used internally when creating SVG elements\n * @static\n * @memberOf fabric.Object\n * @type Number\n */\n fabric.Object.__uid = 0;\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function() {\n\n var degreesToRadians = fabric.util.degreesToRadians,\n originXOffset = {\n left: -0.5,\n center: 0,\n right: 0.5\n },\n originYOffset = {\n top: -0.5,\n center: 0,\n bottom: 0.5\n };\n\n fabric.util.object.extend(fabric.Object.prototype, /** @lends fabric.Object.prototype */ {\n\n /**\n * Translates the coordinates from a set of origin to another (based on the object's dimensions)\n * @param {fabric.Point} point The point which corresponds to the originX and originY params\n * @param {String} fromOriginX Horizontal origin: 'left', 'center' or 'right'\n * @param {String} fromOriginY Vertical origin: 'top', 'center' or 'bottom'\n * @param {String} toOriginX Horizontal origin: 'left', 'center' or 'right'\n * @param {String} toOriginY Vertical origin: 'top', 'center' or 'bottom'\n * @return {fabric.Point}\n */\n translateToGivenOrigin: function(point, fromOriginX, fromOriginY, toOriginX, toOriginY) {\n var x = point.x,\n y = point.y,\n offsetX, offsetY, dim;\n\n if (typeof fromOriginX === 'string') {\n fromOriginX = originXOffset[fromOriginX];\n }\n else {\n fromOriginX -= 0.5;\n }\n\n if (typeof toOriginX === 'string') {\n toOriginX = originXOffset[toOriginX];\n }\n else {\n toOriginX -= 0.5;\n }\n\n offsetX = toOriginX - fromOriginX;\n\n if (typeof fromOriginY === 'string') {\n fromOriginY = originYOffset[fromOriginY];\n }\n else {\n fromOriginY -= 0.5;\n }\n\n if (typeof toOriginY === 'string') {\n toOriginY = originYOffset[toOriginY];\n }\n else {\n toOriginY -= 0.5;\n }\n\n offsetY = toOriginY - fromOriginY;\n\n if (offsetX || offsetY) {\n dim = this._getTransformedDimensions();\n x = point.x + offsetX * dim.x;\n y = point.y + offsetY * dim.y;\n }\n\n return new fabric.Point(x, y);\n },\n\n /**\n * Translates the coordinates from origin to center coordinates (based on the object's dimensions)\n * @param {fabric.Point} point The point which corresponds to the originX and originY params\n * @param {String} originX Horizontal origin: 'left', 'center' or 'right'\n * @param {String} originY Vertical origin: 'top', 'center' or 'bottom'\n * @return {fabric.Point}\n */\n translateToCenterPoint: function(point, originX, originY) {\n var p = this.translateToGivenOrigin(point, originX, originY, 'center', 'center');\n if (this.angle) {\n return fabric.util.rotatePoint(p, point, degreesToRadians(this.angle));\n }\n return p;\n },\n\n /**\n * Translates the coordinates from center to origin coordinates (based on the object's dimensions)\n * @param {fabric.Point} center The point which corresponds to center of the object\n * @param {String} originX Horizontal origin: 'left', 'center' or 'right'\n * @param {String} originY Vertical origin: 'top', 'center' or 'bottom'\n * @return {fabric.Point}\n */\n translateToOriginPoint: function(center, originX, originY) {\n var p = this.translateToGivenOrigin(center, 'center', 'center', originX, originY);\n if (this.angle) {\n return fabric.util.rotatePoint(p, center, degreesToRadians(this.angle));\n }\n return p;\n },\n\n /**\n * Returns the real center coordinates of the object\n * @return {fabric.Point}\n */\n getCenterPoint: function() {\n var leftTop = new fabric.Point(this.left, this.top);\n return this.translateToCenterPoint(leftTop, this.originX, this.originY);\n },\n\n /**\n * Returns the coordinates of the object based on center coordinates\n * @param {fabric.Point} point The point which corresponds to the originX and originY params\n * @return {fabric.Point}\n */\n // getOriginPoint: function(center) {\n // return this.translateToOriginPoint(center, this.originX, this.originY);\n // },\n\n /**\n * Returns the coordinates of the object as if it has a different origin\n * @param {String} originX Horizontal origin: 'left', 'center' or 'right'\n * @param {String} originY Vertical origin: 'top', 'center' or 'bottom'\n * @return {fabric.Point}\n */\n getPointByOrigin: function(originX, originY) {\n var center = this.getCenterPoint();\n return this.translateToOriginPoint(center, originX, originY);\n },\n\n /**\n * Returns the point in local coordinates\n * @param {fabric.Point} point The point relative to the global coordinate system\n * @param {String} originX Horizontal origin: 'left', 'center' or 'right'\n * @param {String} originY Vertical origin: 'top', 'center' or 'bottom'\n * @return {fabric.Point}\n */\n toLocalPoint: function(point, originX, originY) {\n var center = this.getCenterPoint(),\n p, p2;\n\n if (typeof originX !== 'undefined' && typeof originY !== 'undefined' ) {\n p = this.translateToGivenOrigin(center, 'center', 'center', originX, originY);\n }\n else {\n p = new fabric.Point(this.left, this.top);\n }\n\n p2 = new fabric.Point(point.x, point.y);\n if (this.angle) {\n p2 = fabric.util.rotatePoint(p2, center, -degreesToRadians(this.angle));\n }\n return p2.subtractEquals(p);\n },\n\n /**\n * Returns the point in global coordinates\n * @param {fabric.Point} The point relative to the local coordinate system\n * @return {fabric.Point}\n */\n // toGlobalPoint: function(point) {\n // return fabric.util.rotatePoint(point, this.getCenterPoint(), degreesToRadians(this.angle)).addEquals(new fabric.Point(this.left, this.top));\n // },\n\n /**\n * Sets the position of the object taking into consideration the object's origin\n * @param {fabric.Point} pos The new position of the object\n * @param {String} originX Horizontal origin: 'left', 'center' or 'right'\n * @param {String} originY Vertical origin: 'top', 'center' or 'bottom'\n * @return {void}\n */\n setPositionByOrigin: function(pos, originX, originY) {\n var center = this.translateToCenterPoint(pos, originX, originY),\n position = this.translateToOriginPoint(center, this.originX, this.originY);\n this.set('left', position.x);\n this.set('top', position.y);\n },\n\n /**\n * @param {String} to One of 'left', 'center', 'right'\n */\n adjustPosition: function(to) {\n var angle = degreesToRadians(this.angle),\n hypotFull = this.getScaledWidth(),\n xFull = fabric.util.cos(angle) * hypotFull,\n yFull = fabric.util.sin(angle) * hypotFull,\n offsetFrom, offsetTo;\n\n //TODO: this function does not consider mixed situation like top, center.\n if (typeof this.originX === 'string') {\n offsetFrom = originXOffset[this.originX];\n }\n else {\n offsetFrom = this.originX - 0.5;\n }\n if (typeof to === 'string') {\n offsetTo = originXOffset[to];\n }\n else {\n offsetTo = to - 0.5;\n }\n this.left += xFull * (offsetTo - offsetFrom);\n this.top += yFull * (offsetTo - offsetFrom);\n this.setCoords();\n this.originX = to;\n },\n\n /**\n * Sets the origin/position of the object to it's center point\n * @private\n * @return {void}\n */\n _setOriginToCenter: function() {\n this._originalOriginX = this.originX;\n this._originalOriginY = this.originY;\n\n var center = this.getCenterPoint();\n\n this.originX = 'center';\n this.originY = 'center';\n\n this.left = center.x;\n this.top = center.y;\n },\n\n /**\n * Resets the origin/position of the object to it's original origin\n * @private\n * @return {void}\n */\n _resetOrigin: function() {\n var originPoint = this.translateToOriginPoint(\n this.getCenterPoint(),\n this._originalOriginX,\n this._originalOriginY);\n\n this.originX = this._originalOriginX;\n this.originY = this._originalOriginY;\n\n this.left = originPoint.x;\n this.top = originPoint.y;\n\n this._originalOriginX = null;\n this._originalOriginY = null;\n },\n\n /**\n * @private\n */\n _getLeftTopCoords: function() {\n return this.translateToOriginPoint(this.getCenterPoint(), 'left', 'top');\n },\n });\n\n})();\n\n\n(function() {\n\n function arrayFromCoords(coords) {\n return [\n new fabric.Point(coords.tl.x, coords.tl.y),\n new fabric.Point(coords.tr.x, coords.tr.y),\n new fabric.Point(coords.br.x, coords.br.y),\n new fabric.Point(coords.bl.x, coords.bl.y)\n ];\n }\n\n var util = fabric.util,\n degreesToRadians = util.degreesToRadians,\n multiplyMatrices = util.multiplyTransformMatrices,\n transformPoint = util.transformPoint;\n\n util.object.extend(fabric.Object.prototype, /** @lends fabric.Object.prototype */ {\n\n /**\n * Describe object's corner position in canvas element coordinates.\n * properties are depending on control keys and padding the main controls.\n * each property is an object with x, y and corner.\n * The `corner` property contains in a similar manner the 4 points of the\n * interactive area of the corner.\n * The coordinates depends from the controls positionHandler and are used\n * to draw and locate controls\n * @memberOf fabric.Object.prototype\n */\n oCoords: null,\n\n /**\n * Describe object's corner position in canvas object absolute coordinates\n * properties are tl,tr,bl,br and describe the four main corner.\n * each property is an object with x, y, instance of Fabric.Point.\n * The coordinates depends from this properties: width, height, scaleX, scaleY\n * skewX, skewY, angle, strokeWidth, top, left.\n * Those coordinates are useful to understand where an object is. They get updated\n * with oCoords but they do not need to be updated when zoom or panning change.\n * The coordinates get updated with @method setCoords.\n * You can calculate them without updating with @method calcACoords();\n * @memberOf fabric.Object.prototype\n */\n aCoords: null,\n\n /**\n * Describe object's corner position in canvas element coordinates.\n * includes padding. Used of object detection.\n * set and refreshed with setCoords and calcCoords.\n * @memberOf fabric.Object.prototype\n */\n lineCoords: null,\n\n /**\n * storage for object transform matrix\n */\n ownMatrixCache: null,\n\n /**\n * storage for object full transform matrix\n */\n matrixCache: null,\n\n /**\n * custom controls interface\n * controls are added by default_controls.js\n */\n controls: { },\n\n /**\n * return correct set of coordinates for intersection\n * this will return either aCoords or lineCoords.\n * @param {Boolean} absolute will return aCoords if true or lineCoords\n * @return {Object} {tl, tr, br, bl} points\n */\n _getCoords: function(absolute, calculate) {\n if (calculate) {\n return (absolute ? this.calcACoords() : this.calcLineCoords());\n }\n if (!this.aCoords || !this.lineCoords) {\n this.setCoords(true);\n }\n return (absolute ? this.aCoords : this.lineCoords);\n },\n\n /**\n * return correct set of coordinates for intersection\n * this will return either aCoords or lineCoords.\n * The coords are returned in an array.\n * @return {Array} [tl, tr, br, bl] of points\n */\n getCoords: function(absolute, calculate) {\n return arrayFromCoords(this._getCoords(absolute, calculate));\n },\n\n /**\n * Checks if object intersects with an area formed by 2 points\n * @param {Object} pointTL top-left point of area\n * @param {Object} pointBR bottom-right point of area\n * @param {Boolean} [absolute] use coordinates without viewportTransform\n * @param {Boolean} [calculate] use coordinates of current position instead of .oCoords\n * @return {Boolean} true if object intersects with an area formed by 2 points\n */\n intersectsWithRect: function(pointTL, pointBR, absolute, calculate) {\n var coords = this.getCoords(absolute, calculate),\n intersection = fabric.Intersection.intersectPolygonRectangle(\n coords,\n pointTL,\n pointBR\n );\n return intersection.status === 'Intersection';\n },\n\n /**\n * Checks if object intersects with another object\n * @param {Object} other Object to test\n * @param {Boolean} [absolute] use coordinates without viewportTransform\n * @param {Boolean} [calculate] use coordinates of current position instead of .oCoords\n * @return {Boolean} true if object intersects with another object\n */\n intersectsWithObject: function(other, absolute, calculate) {\n var intersection = fabric.Intersection.intersectPolygonPolygon(\n this.getCoords(absolute, calculate),\n other.getCoords(absolute, calculate)\n );\n\n return intersection.status === 'Intersection'\n || other.isContainedWithinObject(this, absolute, calculate)\n || this.isContainedWithinObject(other, absolute, calculate);\n },\n\n /**\n * Checks if object is fully contained within area of another object\n * @param {Object} other Object to test\n * @param {Boolean} [absolute] use coordinates without viewportTransform\n * @param {Boolean} [calculate] use coordinates of current position instead of .oCoords\n * @return {Boolean} true if object is fully contained within area of another object\n */\n isContainedWithinObject: function(other, absolute, calculate) {\n var points = this.getCoords(absolute, calculate),\n otherCoords = absolute ? other.aCoords : other.lineCoords,\n i = 0, lines = other._getImageLines(otherCoords);\n for (; i < 4; i++) {\n if (!other.containsPoint(points[i], lines)) {\n return false;\n }\n }\n return true;\n },\n\n /**\n * Checks if object is fully contained within area formed by 2 points\n * @param {Object} pointTL top-left point of area\n * @param {Object} pointBR bottom-right point of area\n * @param {Boolean} [absolute] use coordinates without viewportTransform\n * @param {Boolean} [calculate] use coordinates of current position instead of .oCoords\n * @return {Boolean} true if object is fully contained within area formed by 2 points\n */\n isContainedWithinRect: function(pointTL, pointBR, absolute, calculate) {\n var boundingRect = this.getBoundingRect(absolute, calculate);\n\n return (\n boundingRect.left >= pointTL.x &&\n boundingRect.left + boundingRect.width <= pointBR.x &&\n boundingRect.top >= pointTL.y &&\n boundingRect.top + boundingRect.height <= pointBR.y\n );\n },\n\n /**\n * Checks if point is inside the object\n * @param {fabric.Point} point Point to check against\n * @param {Object} [lines] object returned from @method _getImageLines\n * @param {Boolean} [absolute] use coordinates without viewportTransform\n * @param {Boolean} [calculate] use coordinates of current position instead of .oCoords\n * @return {Boolean} true if point is inside the object\n */\n containsPoint: function(point, lines, absolute, calculate) {\n var coords = this._getCoords(absolute, calculate),\n lines = lines || this._getImageLines(coords),\n xPoints = this._findCrossPoints(point, lines);\n // if xPoints is odd then point is inside the object\n return (xPoints !== 0 && xPoints % 2 === 1);\n },\n\n /**\n * Checks if object is contained within the canvas with current viewportTransform\n * the check is done stopping at first point that appears on screen\n * @param {Boolean} [calculate] use coordinates of current position instead of .aCoords\n * @return {Boolean} true if object is fully or partially contained within canvas\n */\n isOnScreen: function(calculate) {\n if (!this.canvas) {\n return false;\n }\n var pointTL = this.canvas.vptCoords.tl, pointBR = this.canvas.vptCoords.br;\n var points = this.getCoords(true, calculate);\n // if some point is on screen, the object is on screen.\n if (points.some(function(point) {\n return point.x <= pointBR.x && point.x >= pointTL.x &&\n point.y <= pointBR.y && point.y >= pointTL.y;\n })) {\n return true;\n }\n // no points on screen, check intersection with absolute coordinates\n if (this.intersectsWithRect(pointTL, pointBR, true, calculate)) {\n return true;\n }\n return this._containsCenterOfCanvas(pointTL, pointBR, calculate);\n },\n\n /**\n * Checks if the object contains the midpoint between canvas extremities\n * Does not make sense outside the context of isOnScreen and isPartiallyOnScreen\n * @private\n * @param {Fabric.Point} pointTL Top Left point\n * @param {Fabric.Point} pointBR Top Right point\n * @param {Boolean} calculate use coordinates of current position instead of .oCoords\n * @return {Boolean} true if the object contains the point\n */\n _containsCenterOfCanvas: function(pointTL, pointBR, calculate) {\n // worst case scenario the object is so big that contains the screen\n var centerPoint = { x: (pointTL.x + pointBR.x) / 2, y: (pointTL.y + pointBR.y) / 2 };\n if (this.containsPoint(centerPoint, null, true, calculate)) {\n return true;\n }\n return false;\n },\n\n /**\n * Checks if object is partially contained within the canvas with current viewportTransform\n * @param {Boolean} [calculate] use coordinates of current position instead of .oCoords\n * @return {Boolean} true if object is partially contained within canvas\n */\n isPartiallyOnScreen: function(calculate) {\n if (!this.canvas) {\n return false;\n }\n var pointTL = this.canvas.vptCoords.tl, pointBR = this.canvas.vptCoords.br;\n if (this.intersectsWithRect(pointTL, pointBR, true, calculate)) {\n return true;\n }\n var allPointsAreOutside = this.getCoords(true, calculate).every(function(point) {\n return (point.x >= pointBR.x || point.x <= pointTL.x) &&\n (point.y >= pointBR.y || point.y <= pointTL.y);\n });\n return allPointsAreOutside && this._containsCenterOfCanvas(pointTL, pointBR, calculate);\n },\n\n /**\n * Method that returns an object with the object edges in it, given the coordinates of the corners\n * @private\n * @param {Object} oCoords Coordinates of the object corners\n */\n _getImageLines: function(oCoords) {\n\n var lines = {\n topline: {\n o: oCoords.tl,\n d: oCoords.tr\n },\n rightline: {\n o: oCoords.tr,\n d: oCoords.br\n },\n bottomline: {\n o: oCoords.br,\n d: oCoords.bl\n },\n leftline: {\n o: oCoords.bl,\n d: oCoords.tl\n }\n };\n\n // // debugging\n // if (this.canvas.contextTop) {\n // this.canvas.contextTop.fillRect(lines.bottomline.d.x, lines.bottomline.d.y, 2, 2);\n // this.canvas.contextTop.fillRect(lines.bottomline.o.x, lines.bottomline.o.y, 2, 2);\n //\n // this.canvas.contextTop.fillRect(lines.leftline.d.x, lines.leftline.d.y, 2, 2);\n // this.canvas.contextTop.fillRect(lines.leftline.o.x, lines.leftline.o.y, 2, 2);\n //\n // this.canvas.contextTop.fillRect(lines.topline.d.x, lines.topline.d.y, 2, 2);\n // this.canvas.contextTop.fillRect(lines.topline.o.x, lines.topline.o.y, 2, 2);\n //\n // this.canvas.contextTop.fillRect(lines.rightline.d.x, lines.rightline.d.y, 2, 2);\n // this.canvas.contextTop.fillRect(lines.rightline.o.x, lines.rightline.o.y, 2, 2);\n // }\n\n return lines;\n },\n\n /**\n * Helper method to determine how many cross points are between the 4 object edges\n * and the horizontal line determined by a point on canvas\n * @private\n * @param {fabric.Point} point Point to check\n * @param {Object} lines Coordinates of the object being evaluated\n */\n // remove yi, not used but left code here just in case.\n _findCrossPoints: function(point, lines) {\n var b1, b2, a1, a2, xi, // yi,\n xcount = 0,\n iLine;\n\n for (var lineKey in lines) {\n iLine = lines[lineKey];\n // optimisation 1: line below point. no cross\n if ((iLine.o.y < point.y) && (iLine.d.y < point.y)) {\n continue;\n }\n // optimisation 2: line above point. no cross\n if ((iLine.o.y >= point.y) && (iLine.d.y >= point.y)) {\n continue;\n }\n // optimisation 3: vertical line case\n if ((iLine.o.x === iLine.d.x) && (iLine.o.x >= point.x)) {\n xi = iLine.o.x;\n // yi = point.y;\n }\n // calculate the intersection point\n else {\n b1 = 0;\n b2 = (iLine.d.y - iLine.o.y) / (iLine.d.x - iLine.o.x);\n a1 = point.y - b1 * point.x;\n a2 = iLine.o.y - b2 * iLine.o.x;\n\n xi = -(a1 - a2) / (b1 - b2);\n // yi = a1 + b1 * xi;\n }\n // dont count xi < point.x cases\n if (xi >= point.x) {\n xcount += 1;\n }\n // optimisation 4: specific for square images\n if (xcount === 2) {\n break;\n }\n }\n return xcount;\n },\n\n /**\n * Returns coordinates of object's bounding rectangle (left, top, width, height)\n * the box is intended as aligned to axis of canvas.\n * @param {Boolean} [absolute] use coordinates without viewportTransform\n * @param {Boolean} [calculate] use coordinates of current position instead of .oCoords / .aCoords\n * @return {Object} Object with left, top, width, height properties\n */\n getBoundingRect: function(absolute, calculate) {\n var coords = this.getCoords(absolute, calculate);\n return util.makeBoundingBoxFromPoints(coords);\n },\n\n /**\n * Returns width of an object's bounding box counting transformations\n * before 2.0 it was named getWidth();\n * @return {Number} width value\n */\n getScaledWidth: function() {\n return this._getTransformedDimensions().x;\n },\n\n /**\n * Returns height of an object bounding box counting transformations\n * before 2.0 it was named getHeight();\n * @return {Number} height value\n */\n getScaledHeight: function() {\n return this._getTransformedDimensions().y;\n },\n\n /**\n * Makes sure the scale is valid and modifies it if necessary\n * @private\n * @param {Number} value\n * @return {Number}\n */\n _constrainScale: function(value) {\n if (Math.abs(value) < this.minScaleLimit) {\n if (value < 0) {\n return -this.minScaleLimit;\n }\n else {\n return this.minScaleLimit;\n }\n }\n else if (value === 0) {\n return 0.0001;\n }\n return value;\n },\n\n /**\n * Scales an object (equally by x and y)\n * @param {Number} value Scale factor\n * @return {fabric.Object} thisArg\n * @chainable\n */\n scale: function(value) {\n this._set('scaleX', value);\n this._set('scaleY', value);\n return this.setCoords();\n },\n\n /**\n * Scales an object to a given width, with respect to bounding box (scaling by x/y equally)\n * @param {Number} value New width value\n * @param {Boolean} absolute ignore viewport\n * @return {fabric.Object} thisArg\n * @chainable\n */\n scaleToWidth: function(value, absolute) {\n // adjust to bounding rect factor so that rotated shapes would fit as well\n var boundingRectFactor = this.getBoundingRect(absolute).width / this.getScaledWidth();\n return this.scale(value / this.width / boundingRectFactor);\n },\n\n /**\n * Scales an object to a given height, with respect to bounding box (scaling by x/y equally)\n * @param {Number} value New height value\n * @param {Boolean} absolute ignore viewport\n * @return {fabric.Object} thisArg\n * @chainable\n */\n scaleToHeight: function(value, absolute) {\n // adjust to bounding rect factor so that rotated shapes would fit as well\n var boundingRectFactor = this.getBoundingRect(absolute).height / this.getScaledHeight();\n return this.scale(value / this.height / boundingRectFactor);\n },\n\n /**\n * Calculates and returns the .coords of an object.\n * unused by the library, only for the end dev.\n * @return {Object} Object with tl, tr, br, bl ....\n * @chainable\n * @deprecated\n */\n calcCoords: function(absolute) {\n // this is a compatibility function to avoid removing calcCoords now.\n if (absolute) {\n return this.calcACoords();\n }\n return this.calcOCoords();\n },\n\n calcLineCoords: function() {\n var vpt = this.getViewportTransform(),\n padding = this.padding, angle = degreesToRadians(this.angle),\n cos = util.cos(angle), sin = util.sin(angle),\n cosP = cos * padding, sinP = sin * padding, cosPSinP = cosP + sinP,\n cosPMinusSinP = cosP - sinP, aCoords = this.calcACoords();\n\n var lineCoords = {\n tl: transformPoint(aCoords.tl, vpt),\n tr: transformPoint(aCoords.tr, vpt),\n bl: transformPoint(aCoords.bl, vpt),\n br: transformPoint(aCoords.br, vpt),\n };\n\n if (padding) {\n lineCoords.tl.x -= cosPMinusSinP;\n lineCoords.tl.y -= cosPSinP;\n lineCoords.tr.x += cosPSinP;\n lineCoords.tr.y -= cosPMinusSinP;\n lineCoords.bl.x -= cosPSinP;\n lineCoords.bl.y += cosPMinusSinP;\n lineCoords.br.x += cosPMinusSinP;\n lineCoords.br.y += cosPSinP;\n }\n\n return lineCoords;\n },\n\n calcOCoords: function() {\n var rotateMatrix = this._calcRotateMatrix(),\n translateMatrix = this._calcTranslateMatrix(),\n vpt = this.getViewportTransform(),\n startMatrix = multiplyMatrices(vpt, translateMatrix),\n finalMatrix = multiplyMatrices(startMatrix, rotateMatrix),\n finalMatrix = multiplyMatrices(finalMatrix, [1 / vpt[0], 0, 0, 1 / vpt[3], 0, 0]),\n dim = this._calculateCurrentDimensions(),\n coords = {};\n this.forEachControl(function(control, key, fabricObject) {\n coords[key] = control.positionHandler(dim, finalMatrix, fabricObject);\n });\n\n // debug code\n // var canvas = this.canvas;\n // setTimeout(function() {\n // canvas.contextTop.clearRect(0, 0, 700, 700);\n // canvas.contextTop.fillStyle = 'green';\n // Object.keys(coords).forEach(function(key) {\n // var control = coords[key];\n // canvas.contextTop.fillRect(control.x, control.y, 3, 3);\n // });\n // }, 50);\n return coords;\n },\n\n calcACoords: function() {\n var rotateMatrix = this._calcRotateMatrix(),\n translateMatrix = this._calcTranslateMatrix(),\n finalMatrix = multiplyMatrices(translateMatrix, rotateMatrix),\n dim = this._getTransformedDimensions(),\n w = dim.x / 2, h = dim.y / 2;\n return {\n // corners\n tl: transformPoint({ x: -w, y: -h }, finalMatrix),\n tr: transformPoint({ x: w, y: -h }, finalMatrix),\n bl: transformPoint({ x: -w, y: h }, finalMatrix),\n br: transformPoint({ x: w, y: h }, finalMatrix)\n };\n },\n\n /**\n * Sets corner position coordinates based on current angle, width and height.\n * oCoords are used to find the corners\n * aCoords are used to quickly find an object on the canvas\n * lineCoords are used to quickly find object during pointer events.\n * See {@link https://github.com/kangax/fabric.js/wiki/When-to-call-setCoords|When-to-call-setCoords}\n * @param {Boolean} [skipCorners] skip calculation of oCoords.\n * @return {fabric.Object} thisArg\n * @chainable\n */\n setCoords: function(skipCorners) {\n this.aCoords = this.calcACoords();\n // in case we are in a group, for how the inner group target check works,\n // lineCoords are exactly aCoords. Since the vpt gets absorbed by the normalized pointer.\n this.lineCoords = this.group ? this.aCoords : this.calcLineCoords();\n if (skipCorners) {\n return this;\n }\n // set coordinates of the draggable boxes in the corners used to scale/rotate the image\n this.oCoords = this.calcOCoords();\n this._setCornerCoords && this._setCornerCoords();\n return this;\n },\n\n /**\n * calculate rotation matrix of an object\n * @return {Array} rotation matrix for the object\n */\n _calcRotateMatrix: function() {\n return util.calcRotateMatrix(this);\n },\n\n /**\n * calculate the translation matrix for an object transform\n * @return {Array} rotation matrix for the object\n */\n _calcTranslateMatrix: function() {\n var center = this.getCenterPoint();\n return [1, 0, 0, 1, center.x, center.y];\n },\n\n transformMatrixKey: function(skipGroup) {\n var sep = '_', prefix = '';\n if (!skipGroup && this.group) {\n prefix = this.group.transformMatrixKey(skipGroup) + sep;\n };\n return prefix + this.top + sep + this.left + sep + this.scaleX + sep + this.scaleY +\n sep + this.skewX + sep + this.skewY + sep + this.angle + sep + this.originX + sep + this.originY +\n sep + this.width + sep + this.height + sep + this.strokeWidth + this.flipX + this.flipY;\n },\n\n /**\n * calculate transform matrix that represents the current transformations from the\n * object's properties.\n * @param {Boolean} [skipGroup] return transform matrix for object not counting parent transformations\n * There are some situation in which this is useful to avoid the fake rotation.\n * @return {Array} transform matrix for the object\n */\n calcTransformMatrix: function(skipGroup) {\n var matrix = this.calcOwnMatrix();\n if (skipGroup || !this.group) {\n return matrix;\n }\n var key = this.transformMatrixKey(skipGroup), cache = this.matrixCache || (this.matrixCache = {});\n if (cache.key === key) {\n return cache.value;\n }\n if (this.group) {\n matrix = multiplyMatrices(this.group.calcTransformMatrix(false), matrix);\n }\n cache.key = key;\n cache.value = matrix;\n return matrix;\n },\n\n /**\n * calculate transform matrix that represents the current transformations from the\n * object's properties, this matrix does not include the group transformation\n * @return {Array} transform matrix for the object\n */\n calcOwnMatrix: function() {\n var key = this.transformMatrixKey(true), cache = this.ownMatrixCache || (this.ownMatrixCache = {});\n if (cache.key === key) {\n return cache.value;\n }\n var tMatrix = this._calcTranslateMatrix(),\n options = {\n angle: this.angle,\n translateX: tMatrix[4],\n translateY: tMatrix[5],\n scaleX: this.scaleX,\n scaleY: this.scaleY,\n skewX: this.skewX,\n skewY: this.skewY,\n flipX: this.flipX,\n flipY: this.flipY,\n };\n cache.key = key;\n cache.value = util.composeMatrix(options);\n return cache.value;\n },\n\n /*\n * Calculate object dimensions from its properties\n * @private\n * @deprecated since 3.4.0, please use fabric.util._calcDimensionsTransformMatrix\n * not including or including flipX, flipY to emulate the flipping boolean\n * @return {Object} .x width dimension\n * @return {Object} .y height dimension\n */\n _calcDimensionsTransformMatrix: function(skewX, skewY, flipping) {\n return util.calcDimensionsMatrix({\n skewX: skewX,\n skewY: skewY,\n scaleX: this.scaleX * (flipping && this.flipX ? -1 : 1),\n scaleY: this.scaleY * (flipping && this.flipY ? -1 : 1)\n });\n },\n\n /*\n * Calculate object dimensions from its properties\n * @private\n * @return {Object} .x width dimension\n * @return {Object} .y height dimension\n */\n _getNonTransformedDimensions: function() {\n var strokeWidth = this.strokeWidth,\n w = this.width + strokeWidth,\n h = this.height + strokeWidth;\n return { x: w, y: h };\n },\n\n /*\n * Calculate object bounding box dimensions from its properties scale, skew.\n * @param {Number} skewX, a value to override current skewX\n * @param {Number} skewY, a value to override current skewY\n * @private\n * @return {Object} .x width dimension\n * @return {Object} .y height dimension\n */\n _getTransformedDimensions: function(skewX, skewY) {\n if (typeof skewX === 'undefined') {\n skewX = this.skewX;\n }\n if (typeof skewY === 'undefined') {\n skewY = this.skewY;\n }\n var dimensions = this._getNonTransformedDimensions(), dimX, dimY,\n noSkew = skewX === 0 && skewY === 0;\n\n if (this.strokeUniform) {\n dimX = this.width;\n dimY = this.height;\n }\n else {\n dimX = dimensions.x;\n dimY = dimensions.y;\n }\n if (noSkew) {\n return this._finalizeDimensions(dimX * this.scaleX, dimY * this.scaleY);\n }\n var bbox = util.sizeAfterTransform(dimX, dimY, {\n scaleX: this.scaleX,\n scaleY: this.scaleY,\n skewX: skewX,\n skewY: skewY,\n });\n return this._finalizeDimensions(bbox.x, bbox.y);\n },\n\n /*\n * Calculate object bounding box dimensions from its properties scale, skew.\n * @param Number width width of the bbox\n * @param Number height height of the bbox\n * @private\n * @return {Object} .x finalized width dimension\n * @return {Object} .y finalized height dimension\n */\n _finalizeDimensions: function(width, height) {\n return this.strokeUniform ?\n { x: width + this.strokeWidth, y: height + this.strokeWidth }\n :\n { x: width, y: height };\n },\n\n /*\n * Calculate object dimensions for controls box, including padding and canvas zoom.\n * and active selection\n * private\n */\n _calculateCurrentDimensions: function() {\n var vpt = this.getViewportTransform(),\n dim = this._getTransformedDimensions(),\n p = transformPoint(dim, vpt, true);\n return p.scalarAdd(2 * this.padding);\n },\n });\n})();\n\n\nfabric.util.object.extend(fabric.Object.prototype, /** @lends fabric.Object.prototype */ {\n\n /**\n * Moves an object to the bottom of the stack of drawn objects\n * @return {fabric.Object} thisArg\n * @chainable\n */\n sendToBack: function() {\n if (this.group) {\n fabric.StaticCanvas.prototype.sendToBack.call(this.group, this);\n }\n else if (this.canvas) {\n this.canvas.sendToBack(this);\n }\n return this;\n },\n\n /**\n * Moves an object to the top of the stack of drawn objects\n * @return {fabric.Object} thisArg\n * @chainable\n */\n bringToFront: function() {\n if (this.group) {\n fabric.StaticCanvas.prototype.bringToFront.call(this.group, this);\n }\n else if (this.canvas) {\n this.canvas.bringToFront(this);\n }\n return this;\n },\n\n /**\n * Moves an object down in stack of drawn objects\n * @param {Boolean} [intersecting] If `true`, send object behind next lower intersecting object\n * @return {fabric.Object} thisArg\n * @chainable\n */\n sendBackwards: function(intersecting) {\n if (this.group) {\n fabric.StaticCanvas.prototype.sendBackwards.call(this.group, this, intersecting);\n }\n else if (this.canvas) {\n this.canvas.sendBackwards(this, intersecting);\n }\n return this;\n },\n\n /**\n * Moves an object up in stack of drawn objects\n * @param {Boolean} [intersecting] If `true`, send object in front of next upper intersecting object\n * @return {fabric.Object} thisArg\n * @chainable\n */\n bringForward: function(intersecting) {\n if (this.group) {\n fabric.StaticCanvas.prototype.bringForward.call(this.group, this, intersecting);\n }\n else if (this.canvas) {\n this.canvas.bringForward(this, intersecting);\n }\n return this;\n },\n\n /**\n * Moves an object to specified level in stack of drawn objects\n * @param {Number} index New position of object\n * @return {fabric.Object} thisArg\n * @chainable\n */\n moveTo: function(index) {\n if (this.group && this.group.type !== 'activeSelection') {\n fabric.StaticCanvas.prototype.moveTo.call(this.group, this, index);\n }\n else if (this.canvas) {\n this.canvas.moveTo(this, index);\n }\n return this;\n }\n});\n\n\n/* _TO_SVG_START_ */\n(function() {\n function getSvgColorString(prop, value) {\n if (!value) {\n return prop + ': none; ';\n }\n else if (value.toLive) {\n return prop + ': url(#SVGID_' + value.id + '); ';\n }\n else {\n var color = new fabric.Color(value),\n str = prop + ': ' + color.toRgb() + '; ',\n opacity = color.getAlpha();\n if (opacity !== 1) {\n //change the color in rgb + opacity\n str += prop + '-opacity: ' + opacity.toString() + '; ';\n }\n return str;\n }\n }\n\n var toFixed = fabric.util.toFixed;\n\n fabric.util.object.extend(fabric.Object.prototype, /** @lends fabric.Object.prototype */ {\n /**\n * Returns styles-string for svg-export\n * @param {Boolean} skipShadow a boolean to skip shadow filter output\n * @return {String}\n */\n getSvgStyles: function(skipShadow) {\n\n var fillRule = this.fillRule ? this.fillRule : 'nonzero',\n strokeWidth = this.strokeWidth ? this.strokeWidth : '0',\n strokeDashArray = this.strokeDashArray ? this.strokeDashArray.join(' ') : 'none',\n strokeDashOffset = this.strokeDashOffset ? this.strokeDashOffset : '0',\n strokeLineCap = this.strokeLineCap ? this.strokeLineCap : 'butt',\n strokeLineJoin = this.strokeLineJoin ? this.strokeLineJoin : 'miter',\n strokeMiterLimit = this.strokeMiterLimit ? this.strokeMiterLimit : '4',\n opacity = typeof this.opacity !== 'undefined' ? this.opacity : '1',\n visibility = this.visible ? '' : ' visibility: hidden;',\n filter = skipShadow ? '' : this.getSvgFilter(),\n fill = getSvgColorString('fill', this.fill),\n stroke = getSvgColorString('stroke', this.stroke);\n\n return [\n stroke,\n 'stroke-width: ', strokeWidth, '; ',\n 'stroke-dasharray: ', strokeDashArray, '; ',\n 'stroke-linecap: ', strokeLineCap, '; ',\n 'stroke-dashoffset: ', strokeDashOffset, '; ',\n 'stroke-linejoin: ', strokeLineJoin, '; ',\n 'stroke-miterlimit: ', strokeMiterLimit, '; ',\n fill,\n 'fill-rule: ', fillRule, '; ',\n 'opacity: ', opacity, ';',\n filter,\n visibility\n ].join('');\n },\n\n /**\n * Returns styles-string for svg-export\n * @param {Object} style the object from which to retrieve style properties\n * @param {Boolean} useWhiteSpace a boolean to include an additional attribute in the style.\n * @return {String}\n */\n getSvgSpanStyles: function(style, useWhiteSpace) {\n var term = '; ';\n var fontFamily = style.fontFamily ?\n 'font-family: ' + (((style.fontFamily.indexOf('\\'') === -1 && style.fontFamily.indexOf('\"') === -1) ?\n '\\'' + style.fontFamily + '\\'' : style.fontFamily)) + term : '';\n var strokeWidth = style.strokeWidth ? 'stroke-width: ' + style.strokeWidth + term : '',\n fontFamily = fontFamily,\n fontSize = style.fontSize ? 'font-size: ' + style.fontSize + 'px' + term : '',\n fontStyle = style.fontStyle ? 'font-style: ' + style.fontStyle + term : '',\n fontWeight = style.fontWeight ? 'font-weight: ' + style.fontWeight + term : '',\n fill = style.fill ? getSvgColorString('fill', style.fill) : '',\n stroke = style.stroke ? getSvgColorString('stroke', style.stroke) : '',\n textDecoration = this.getSvgTextDecoration(style),\n deltaY = style.deltaY ? 'baseline-shift: ' + (-style.deltaY) + '; ' : '';\n if (textDecoration) {\n textDecoration = 'text-decoration: ' + textDecoration + term;\n }\n\n return [\n stroke,\n strokeWidth,\n fontFamily,\n fontSize,\n fontStyle,\n fontWeight,\n textDecoration,\n fill,\n deltaY,\n useWhiteSpace ? 'white-space: pre; ' : ''\n ].join('');\n },\n\n /**\n * Returns text-decoration property for svg-export\n * @param {Object} style the object from which to retrieve style properties\n * @return {String}\n */\n getSvgTextDecoration: function(style) {\n return ['overline', 'underline', 'line-through'].filter(function(decoration) {\n return style[decoration.replace('-', '')];\n }).join(' ');\n },\n\n /**\n * Returns filter for svg shadow\n * @return {String}\n */\n getSvgFilter: function() {\n return this.shadow ? 'filter: url(#SVGID_' + this.shadow.id + ');' : '';\n },\n\n /**\n * Returns id attribute for svg output\n * @return {String}\n */\n getSvgCommons: function() {\n return [\n this.id ? 'id=\"' + this.id + '\" ' : '',\n this.clipPath ? 'clip-path=\"url(#' + this.clipPath.clipPathId + ')\" ' : '',\n ].join('');\n },\n\n /**\n * Returns transform-string for svg-export\n * @param {Boolean} use the full transform or the single object one.\n * @return {String}\n */\n getSvgTransform: function(full, additionalTransform) {\n var transform = full ? this.calcTransformMatrix() : this.calcOwnMatrix(),\n svgTransform = 'transform=\"' + fabric.util.matrixToSVG(transform);\n return svgTransform +\n (additionalTransform || '') + '\" ';\n },\n\n _setSVGBg: function(textBgRects) {\n if (this.backgroundColor) {\n var NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS;\n textBgRects.push(\n '\\t\\t<rect ',\n this._getFillAttributes(this.backgroundColor),\n ' x=\"',\n toFixed(-this.width / 2, NUM_FRACTION_DIGITS),\n '\" y=\"',\n toFixed(-this.height / 2, NUM_FRACTION_DIGITS),\n '\" width=\"',\n toFixed(this.width, NUM_FRACTION_DIGITS),\n '\" height=\"',\n toFixed(this.height, NUM_FRACTION_DIGITS),\n '\"></rect>\\n');\n }\n },\n\n /**\n * Returns svg representation of an instance\n * @param {Function} [reviver] Method for further parsing of svg representation.\n * @return {String} svg representation of an instance\n */\n toSVG: function(reviver) {\n return this._createBaseSVGMarkup(this._toSVG(reviver), { reviver: reviver });\n },\n\n /**\n * Returns svg clipPath representation of an instance\n * @param {Function} [reviver] Method for further parsing of svg representation.\n * @return {String} svg representation of an instance\n */\n toClipPathSVG: function(reviver) {\n return '\\t' + this._createBaseClipPathSVGMarkup(this._toSVG(reviver), { reviver: reviver });\n },\n\n /**\n * @private\n */\n _createBaseClipPathSVGMarkup: function(objectMarkup, options) {\n options = options || {};\n var reviver = options.reviver,\n additionalTransform = options.additionalTransform || '',\n commonPieces = [\n this.getSvgTransform(true, additionalTransform),\n this.getSvgCommons(),\n ].join(''),\n // insert commons in the markup, style and svgCommons\n index = objectMarkup.indexOf('COMMON_PARTS');\n objectMarkup[index] = commonPieces;\n return reviver ? reviver(objectMarkup.join('')) : objectMarkup.join('');\n },\n\n /**\n * @private\n */\n _createBaseSVGMarkup: function(objectMarkup, options) {\n options = options || {};\n var noStyle = options.noStyle,\n reviver = options.reviver,\n styleInfo = noStyle ? '' : 'style=\"' + this.getSvgStyles() + '\" ',\n shadowInfo = options.withShadow ? 'style=\"' + this.getSvgFilter() + '\" ' : '',\n clipPath = this.clipPath,\n vectorEffect = this.strokeUniform ? 'vector-effect=\"non-scaling-stroke\" ' : '',\n absoluteClipPath = clipPath && clipPath.absolutePositioned,\n stroke = this.stroke, fill = this.fill, shadow = this.shadow,\n commonPieces, markup = [], clipPathMarkup,\n // insert commons in the markup, style and svgCommons\n index = objectMarkup.indexOf('COMMON_PARTS'),\n additionalTransform = options.additionalTransform;\n if (clipPath) {\n clipPath.clipPathId = 'CLIPPATH_' + fabric.Object.__uid++;\n clipPathMarkup = '<clipPath id=\"' + clipPath.clipPathId + '\" >\\n' +\n clipPath.toClipPathSVG(reviver) +\n '</clipPath>\\n';\n }\n if (absoluteClipPath) {\n markup.push(\n '<g ', shadowInfo, this.getSvgCommons(), ' >\\n'\n );\n }\n markup.push(\n '<g ',\n this.getSvgTransform(false),\n !absoluteClipPath ? shadowInfo + this.getSvgCommons() : '',\n ' >\\n'\n );\n commonPieces = [\n styleInfo,\n vectorEffect,\n noStyle ? '' : this.addPaintOrder(), ' ',\n additionalTransform ? 'transform=\"' + additionalTransform + '\" ' : '',\n ].join('');\n objectMarkup[index] = commonPieces;\n if (fill && fill.toLive) {\n markup.push(fill.toSVG(this));\n }\n if (stroke && stroke.toLive) {\n markup.push(stroke.toSVG(this));\n }\n if (shadow) {\n markup.push(shadow.toSVG(this));\n }\n if (clipPath) {\n markup.push(clipPathMarkup);\n }\n markup.push(objectMarkup.join(''));\n markup.push('</g>\\n');\n absoluteClipPath && markup.push('</g>\\n');\n return reviver ? reviver(markup.join('')) : markup.join('');\n },\n\n addPaintOrder: function() {\n return this.paintFirst !== 'fill' ? ' paint-order=\"' + this.paintFirst + '\" ' : '';\n }\n });\n})();\n/* _TO_SVG_END_ */\n\n\n(function() {\n\n var extend = fabric.util.object.extend,\n originalSet = 'stateProperties';\n\n /*\n Depends on `stateProperties`\n */\n function saveProps(origin, destination, props) {\n var tmpObj = { }, deep = true;\n props.forEach(function(prop) {\n tmpObj[prop] = origin[prop];\n });\n\n extend(origin[destination], tmpObj, deep);\n }\n\n function _isEqual(origValue, currentValue, firstPass) {\n if (origValue === currentValue) {\n // if the objects are identical, return\n return true;\n }\n else if (Array.isArray(origValue)) {\n if (!Array.isArray(currentValue) || origValue.length !== currentValue.length) {\n return false;\n }\n for (var i = 0, len = origValue.length; i < len; i++) {\n if (!_isEqual(origValue[i], currentValue[i])) {\n return false;\n }\n }\n return true;\n }\n else if (origValue && typeof origValue === 'object') {\n var keys = Object.keys(origValue), key;\n if (!currentValue ||\n typeof currentValue !== 'object' ||\n (!firstPass && keys.length !== Object.keys(currentValue).length)\n ) {\n return false;\n }\n for (var i = 0, len = keys.length; i < len; i++) {\n key = keys[i];\n // since clipPath is in the statefull cache list and the clipPath objects\n // would be iterated as an object, this would lead to possible infinite recursion\n // we do not want to compare those.\n if (key === 'canvas' || key === 'group') {\n continue;\n }\n if (!_isEqual(origValue[key], currentValue[key])) {\n return false;\n }\n }\n return true;\n }\n }\n\n\n fabric.util.object.extend(fabric.Object.prototype, /** @lends fabric.Object.prototype */ {\n\n /**\n * Returns true if object state (one of its state properties) was changed\n * @param {String} [propertySet] optional name for the set of property we want to save\n * @return {Boolean} true if instance' state has changed since `{@link fabric.Object#saveState}` was called\n */\n hasStateChanged: function(propertySet) {\n propertySet = propertySet || originalSet;\n var dashedPropertySet = '_' + propertySet;\n if (Object.keys(this[dashedPropertySet]).length < this[propertySet].length) {\n return true;\n }\n return !_isEqual(this[dashedPropertySet], this, true);\n },\n\n /**\n * Saves state of an object\n * @param {Object} [options] Object with additional `stateProperties` array to include when saving state\n * @return {fabric.Object} thisArg\n */\n saveState: function(options) {\n var propertySet = options && options.propertySet || originalSet,\n destination = '_' + propertySet;\n if (!this[destination]) {\n return this.setupState(options);\n }\n saveProps(this, destination, this[propertySet]);\n if (options && options.stateProperties) {\n saveProps(this, destination, options.stateProperties);\n }\n return this;\n },\n\n /**\n * Setups state of an object\n * @param {Object} [options] Object with additional `stateProperties` array to include when saving state\n * @return {fabric.Object} thisArg\n */\n setupState: function(options) {\n options = options || { };\n var propertySet = options.propertySet || originalSet;\n options.propertySet = propertySet;\n this['_' + propertySet] = { };\n this.saveState(options);\n return this;\n }\n });\n})();\n\n\n(function() {\n\n var degreesToRadians = fabric.util.degreesToRadians;\n\n fabric.util.object.extend(fabric.Object.prototype, /** @lends fabric.Object.prototype */ {\n /**\n * Determines which corner has been clicked\n * @private\n * @param {Object} pointer The pointer indicating the mouse position\n * @return {String|Boolean} corner code (tl, tr, bl, br, etc.), or false if nothing is found\n */\n _findTargetCorner: function(pointer, forTouch) {\n // objects in group, anykind, are not self modificable,\n // must not return an hovered corner.\n if (!this.hasControls || this.group || (!this.canvas || this.canvas._activeObject !== this)) {\n return false;\n }\n\n var ex = pointer.x,\n ey = pointer.y,\n xPoints,\n lines, keys = Object.keys(this.oCoords),\n j = keys.length - 1, i;\n this.__corner = 0;\n\n // cycle in reverse order so we pick first the one on top\n for (; j >= 0; j--) {\n i = keys[j];\n if (!this.isControlVisible(i)) {\n continue;\n }\n\n lines = this._getImageLines(forTouch ? this.oCoords[i].touchCorner : this.oCoords[i].corner);\n // debugging\n\n // this.canvas.contextTop.fillRect(lines.bottomline.d.x, lines.bottomline.d.y, 2, 2);\n // this.canvas.contextTop.fillRect(lines.bottomline.o.x, lines.bottomline.o.y, 2, 2);\n //\n // this.canvas.contextTop.fillRect(lines.leftline.d.x, lines.leftline.d.y, 2, 2);\n // this.canvas.contextTop.fillRect(lines.leftline.o.x, lines.leftline.o.y, 2, 2);\n //\n // this.canvas.contextTop.fillRect(lines.topline.d.x, lines.topline.d.y, 2, 2);\n // this.canvas.contextTop.fillRect(lines.topline.o.x, lines.topline.o.y, 2, 2);\n //\n // this.canvas.contextTop.fillRect(lines.rightline.d.x, lines.rightline.d.y, 2, 2);\n // this.canvas.contextTop.fillRect(lines.rightline.o.x, lines.rightline.o.y, 2, 2);\n\n xPoints = this._findCrossPoints({ x: ex, y: ey }, lines);\n if (xPoints !== 0 && xPoints % 2 === 1) {\n this.__corner = i;\n return i;\n }\n }\n return false;\n },\n\n /**\n * Calls a function for each control. The function gets called,\n * with the control, the object that is calling the iterator and the control's key\n * @param {Function} fn function to iterate over the controls over\n */\n forEachControl: function(fn) {\n for (var i in this.controls) {\n fn(this.controls[i], i, this);\n };\n },\n\n /**\n * Sets the coordinates of the draggable boxes in the corners of\n * the image used to scale/rotate it.\n * note: if we would switch to ROUND corner area, all of this would disappear.\n * everything would resolve to a single point and a pythagorean theorem for the distance\n * @private\n */\n _setCornerCoords: function() {\n var coords = this.oCoords,\n newTheta = degreesToRadians(45 - this.angle),\n cosTheta = fabric.util.cos(newTheta),\n sinTheta = fabric.util.sin(newTheta),\n /* Math.sqrt(2 * Math.pow(this.cornerSize, 2)) / 2, */\n /* 0.707106 stands for sqrt(2)/2 */\n cornerHypotenuse = this.cornerSize * 0.707106,\n touchHypotenuse = this.touchCornerSize * 0.707106,\n cosHalfOffset = cornerHypotenuse * cosTheta,\n sinHalfOffset = cornerHypotenuse * sinTheta,\n touchCosHalfOffset = touchHypotenuse * cosTheta,\n touchSinHalfOffset = touchHypotenuse * sinTheta,\n x, y;\n\n for (var control in coords) {\n x = coords[control].x;\n y = coords[control].y;\n coords[control].corner = {\n tl: {\n x: x - sinHalfOffset,\n y: y - cosHalfOffset\n },\n tr: {\n x: x + cosHalfOffset,\n y: y - sinHalfOffset\n },\n bl: {\n x: x - cosHalfOffset,\n y: y + sinHalfOffset\n },\n br: {\n x: x + sinHalfOffset,\n y: y + cosHalfOffset\n }\n };\n coords[control].touchCorner = {\n tl: {\n x: x - touchSinHalfOffset,\n y: y - touchCosHalfOffset\n },\n tr: {\n x: x + touchCosHalfOffset,\n y: y - touchSinHalfOffset\n },\n bl: {\n x: x - touchCosHalfOffset,\n y: y + touchSinHalfOffset\n },\n br: {\n x: x + touchSinHalfOffset,\n y: y + touchCosHalfOffset\n }\n };\n }\n },\n\n /**\n * Draws a colored layer behind the object, inside its selection borders.\n * Requires public options: padding, selectionBackgroundColor\n * this function is called when the context is transformed\n * has checks to be skipped when the object is on a staticCanvas\n * @param {CanvasRenderingContext2D} ctx Context to draw on\n * @return {fabric.Object} thisArg\n * @chainable\n */\n drawSelectionBackground: function(ctx) {\n if (!this.selectionBackgroundColor ||\n (this.canvas && !this.canvas.interactive) ||\n (this.canvas && this.canvas._activeObject !== this)\n ) {\n return this;\n }\n ctx.save();\n var center = this.getCenterPoint(), wh = this._calculateCurrentDimensions(),\n vpt = this.canvas.viewportTransform;\n ctx.translate(center.x, center.y);\n ctx.scale(1 / vpt[0], 1 / vpt[3]);\n ctx.rotate(degreesToRadians(this.angle));\n ctx.fillStyle = this.selectionBackgroundColor;\n ctx.fillRect(-wh.x / 2, -wh.y / 2, wh.x, wh.y);\n ctx.restore();\n return this;\n },\n\n /**\n * Draws borders of an object's bounding box.\n * Requires public properties: width, height\n * Requires public options: padding, borderColor\n * @param {CanvasRenderingContext2D} ctx Context to draw on\n * @param {Object} styleOverride object to override the object style\n * @return {fabric.Object} thisArg\n * @chainable\n */\n drawBorders: function(ctx, styleOverride) {\n styleOverride = styleOverride || {};\n var wh = this._calculateCurrentDimensions(),\n strokeWidth = this.borderScaleFactor,\n width = wh.x + strokeWidth,\n height = wh.y + strokeWidth,\n hasControls = typeof styleOverride.hasControls !== 'undefined' ?\n styleOverride.hasControls : this.hasControls,\n shouldStroke = false;\n\n ctx.save();\n ctx.strokeStyle = styleOverride.borderColor || this.borderColor;\n this._setLineDash(ctx, styleOverride.borderDashArray || this.borderDashArray, null);\n\n ctx.strokeRect(\n -width / 2,\n -height / 2,\n width,\n height\n );\n\n if (hasControls) {\n ctx.beginPath();\n this.forEachControl(function(control, key, fabricObject) {\n // in this moment, the ctx is centered on the object.\n // width and height of the above function are the size of the bbox.\n if (control.withConnection && control.getVisibility(fabricObject, key)) {\n // reset movement for each control\n shouldStroke = true;\n ctx.moveTo(control.x * width, control.y * height);\n ctx.lineTo(\n control.x * width + control.offsetX,\n control.y * height + control.offsetY\n );\n }\n });\n if (shouldStroke) {\n ctx.stroke();\n }\n }\n ctx.restore();\n return this;\n },\n\n /**\n * Draws borders of an object's bounding box when it is inside a group.\n * Requires public properties: width, height\n * Requires public options: padding, borderColor\n * @param {CanvasRenderingContext2D} ctx Context to draw on\n * @param {object} options object representing current object parameters\n * @param {Object} styleOverride object to override the object style\n * @return {fabric.Object} thisArg\n * @chainable\n */\n drawBordersInGroup: function(ctx, options, styleOverride) {\n styleOverride = styleOverride || {};\n var bbox = fabric.util.sizeAfterTransform(this.width, this.height, options),\n strokeWidth = this.strokeWidth,\n strokeUniform = this.strokeUniform,\n borderScaleFactor = this.borderScaleFactor,\n width =\n bbox.x + strokeWidth * (strokeUniform ? this.canvas.getZoom() : options.scaleX) + borderScaleFactor,\n height =\n bbox.y + strokeWidth * (strokeUniform ? this.canvas.getZoom() : options.scaleY) + borderScaleFactor;\n ctx.save();\n this._setLineDash(ctx, styleOverride.borderDashArray || this.borderDashArray, null);\n ctx.strokeStyle = styleOverride.borderColor || this.borderColor;\n ctx.strokeRect(\n -width / 2,\n -height / 2,\n width,\n height\n );\n\n ctx.restore();\n return this;\n },\n\n /**\n * Draws corners of an object's bounding box.\n * Requires public properties: width, height\n * Requires public options: cornerSize, padding\n * @param {CanvasRenderingContext2D} ctx Context to draw on\n * @param {Object} styleOverride object to override the object style\n * @return {fabric.Object} thisArg\n * @chainable\n */\n drawControls: function(ctx, styleOverride) {\n styleOverride = styleOverride || {};\n ctx.save();\n ctx.setTransform(this.canvas.getRetinaScaling(), 0, 0, this.canvas.getRetinaScaling(), 0, 0);\n ctx.strokeStyle = ctx.fillStyle = styleOverride.cornerColor || this.cornerColor;\n if (!this.transparentCorners) {\n ctx.strokeStyle = styleOverride.cornerStrokeColor || this.cornerStrokeColor;\n }\n this._setLineDash(ctx, styleOverride.cornerDashArray || this.cornerDashArray, null);\n this.setCoords();\n this.forEachControl(function(control, key, fabricObject) {\n if (control.getVisibility(fabricObject, key)) {\n control.render(ctx,\n fabricObject.oCoords[key].x,\n fabricObject.oCoords[key].y, styleOverride, fabricObject);\n }\n });\n ctx.restore();\n\n return this;\n },\n\n /**\n * Returns true if the specified control is visible, false otherwise.\n * @param {String} controlKey The key of the control. Possible values are 'tl', 'tr', 'br', 'bl', 'ml', 'mt', 'mr', 'mb', 'mtr'.\n * @returns {Boolean} true if the specified control is visible, false otherwise\n */\n isControlVisible: function(controlKey) {\n return this.controls[controlKey] && this.controls[controlKey].getVisibility(this, controlKey);\n },\n\n /**\n * Sets the visibility of the specified control.\n * @param {String} controlKey The key of the control. Possible values are 'tl', 'tr', 'br', 'bl', 'ml', 'mt', 'mr', 'mb', 'mtr'.\n * @param {Boolean} visible true to set the specified control visible, false otherwise\n * @return {fabric.Object} thisArg\n * @chainable\n */\n setControlVisible: function(controlKey, visible) {\n if (!this._controlsVisibility) {\n this._controlsVisibility = {};\n }\n this._controlsVisibility[controlKey] = visible;\n return this;\n },\n\n /**\n * Sets the visibility state of object controls.\n * @param {Object} [options] Options object\n * @param {Boolean} [options.bl] true to enable the bottom-left control, false to disable it\n * @param {Boolean} [options.br] true to enable the bottom-right control, false to disable it\n * @param {Boolean} [options.mb] true to enable the middle-bottom control, false to disable it\n * @param {Boolean} [options.ml] true to enable the middle-left control, false to disable it\n * @param {Boolean} [options.mr] true to enable the middle-right control, false to disable it\n * @param {Boolean} [options.mt] true to enable the middle-top control, false to disable it\n * @param {Boolean} [options.tl] true to enable the top-left control, false to disable it\n * @param {Boolean} [options.tr] true to enable the top-right control, false to disable it\n * @param {Boolean} [options.mtr] true to enable the middle-top-rotate control, false to disable it\n * @return {fabric.Object} thisArg\n * @chainable\n */\n setControlsVisibility: function(options) {\n options || (options = { });\n\n for (var p in options) {\n this.setControlVisible(p, options[p]);\n }\n return this;\n },\n\n\n /**\n * This callback function is called every time _discardActiveObject or _setActiveObject\n * try to to deselect this object. If the function returns true, the process is cancelled\n * @param {Object} [options] options sent from the upper functions\n * @param {Event} [options.e] event if the process is generated by an event\n */\n onDeselect: function() {\n // implemented by sub-classes, as needed.\n },\n\n\n /**\n * This callback function is called every time _discardActiveObject or _setActiveObject\n * try to to select this object. If the function returns true, the process is cancelled\n * @param {Object} [options] options sent from the upper functions\n * @param {Event} [options.e] event if the process is generated by an event\n */\n onSelect: function() {\n // implemented by sub-classes, as needed.\n }\n });\n})();\n\n\nfabric.util.object.extend(fabric.StaticCanvas.prototype, /** @lends fabric.StaticCanvas.prototype */ {\n\n /**\n * Animation duration (in ms) for fx* methods\n * @type Number\n * @default\n */\n FX_DURATION: 500,\n\n /**\n * Centers object horizontally with animation.\n * @param {fabric.Object} object Object to center\n * @param {Object} [callbacks] Callbacks object with optional \"onComplete\" and/or \"onChange\" properties\n * @param {Function} [callbacks.onComplete] Invoked on completion\n * @param {Function} [callbacks.onChange] Invoked on every step of animation\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n fxCenterObjectH: function (object, callbacks) {\n callbacks = callbacks || { };\n\n var empty = function() { },\n onComplete = callbacks.onComplete || empty,\n onChange = callbacks.onChange || empty,\n _this = this;\n\n fabric.util.animate({\n startValue: object.left,\n endValue: this.getCenter().left,\n duration: this.FX_DURATION,\n onChange: function(value) {\n object.set('left', value);\n _this.requestRenderAll();\n onChange();\n },\n onComplete: function() {\n object.setCoords();\n onComplete();\n }\n });\n\n return this;\n },\n\n /**\n * Centers object vertically with animation.\n * @param {fabric.Object} object Object to center\n * @param {Object} [callbacks] Callbacks object with optional \"onComplete\" and/or \"onChange\" properties\n * @param {Function} [callbacks.onComplete] Invoked on completion\n * @param {Function} [callbacks.onChange] Invoked on every step of animation\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n fxCenterObjectV: function (object, callbacks) {\n callbacks = callbacks || { };\n\n var empty = function() { },\n onComplete = callbacks.onComplete || empty,\n onChange = callbacks.onChange || empty,\n _this = this;\n\n fabric.util.animate({\n startValue: object.top,\n endValue: this.getCenter().top,\n duration: this.FX_DURATION,\n onChange: function(value) {\n object.set('top', value);\n _this.requestRenderAll();\n onChange();\n },\n onComplete: function() {\n object.setCoords();\n onComplete();\n }\n });\n\n return this;\n },\n\n /**\n * Same as `fabric.Canvas#remove` but animated\n * @param {fabric.Object} object Object to remove\n * @param {Object} [callbacks] Callbacks object with optional \"onComplete\" and/or \"onChange\" properties\n * @param {Function} [callbacks.onComplete] Invoked on completion\n * @param {Function} [callbacks.onChange] Invoked on every step of animation\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n fxRemove: function (object, callbacks) {\n callbacks = callbacks || { };\n\n var empty = function() { },\n onComplete = callbacks.onComplete || empty,\n onChange = callbacks.onChange || empty,\n _this = this;\n\n fabric.util.animate({\n startValue: object.opacity,\n endValue: 0,\n duration: this.FX_DURATION,\n onChange: function(value) {\n object.set('opacity', value);\n _this.requestRenderAll();\n onChange();\n },\n onComplete: function () {\n _this.remove(object);\n onComplete();\n }\n });\n\n return this;\n }\n});\n\nfabric.util.object.extend(fabric.Object.prototype, /** @lends fabric.Object.prototype */ {\n /**\n * Animates object's properties\n * @param {String|Object} property Property to animate (if string) or properties to animate (if object)\n * @param {Number|Object} value Value to animate property to (if string was given first) or options object\n * @return {fabric.Object} thisArg\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-2#animation}\n * @chainable\n *\n * As object — multiple properties\n *\n * object.animate({ left: ..., top: ... });\n * object.animate({ left: ..., top: ... }, { duration: ... });\n *\n * As string — one property\n *\n * object.animate('left', ...);\n * object.animate('left', { duration: ... });\n *\n */\n animate: function() {\n if (arguments[0] && typeof arguments[0] === 'object') {\n var propsToAnimate = [], prop, skipCallbacks;\n for (prop in arguments[0]) {\n propsToAnimate.push(prop);\n }\n for (var i = 0, len = propsToAnimate.length; i < len; i++) {\n prop = propsToAnimate[i];\n skipCallbacks = i !== len - 1;\n this._animate(prop, arguments[0][prop], arguments[1], skipCallbacks);\n }\n }\n else {\n this._animate.apply(this, arguments);\n }\n return this;\n },\n\n /**\n * @private\n * @param {String} property Property to animate\n * @param {String} to Value to animate to\n * @param {Object} [options] Options object\n * @param {Boolean} [skipCallbacks] When true, callbacks like onchange and oncomplete are not invoked\n */\n _animate: function(property, to, options, skipCallbacks) {\n var _this = this, propPair;\n\n to = to.toString();\n\n if (!options) {\n options = { };\n }\n else {\n options = fabric.util.object.clone(options);\n }\n\n if (~property.indexOf('.')) {\n propPair = property.split('.');\n }\n\n var propIsColor =\n _this.colorProperties.indexOf(property) > -1 ||\n (propPair && _this.colorProperties.indexOf(propPair[1]) > -1);\n\n var currentValue = propPair\n ? this.get(propPair[0])[propPair[1]]\n : this.get(property);\n\n if (!('from' in options)) {\n options.from = currentValue;\n }\n\n if (!propIsColor) {\n if (~to.indexOf('=')) {\n to = currentValue + parseFloat(to.replace('=', ''));\n }\n else {\n to = parseFloat(to);\n }\n }\n\n var _options = {\n startValue: options.from,\n endValue: to,\n byValue: options.by,\n easing: options.easing,\n duration: options.duration,\n abort: options.abort && function () {\n return options.abort.call(_this);\n },\n onChange: function (value, valueProgress, timeProgress) {\n if (propPair) {\n _this[propPair[0]][propPair[1]] = value;\n }\n else {\n _this.set(property, value);\n }\n if (skipCallbacks) {\n return;\n }\n options.onChange && options.onChange(value, valueProgress, timeProgress);\n },\n onComplete: function (value, valueProgress, timeProgress) {\n if (skipCallbacks) {\n return;\n }\n\n _this.setCoords();\n options.onComplete && options.onComplete(value, valueProgress, timeProgress);\n }\n };\n\n if (propIsColor) {\n fabric.util.animateColor(_options.startValue, _options.endValue, _options.duration, _options);\n }\n else {\n fabric.util.animate(_options);\n }\n }\n});\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }),\n extend = fabric.util.object.extend,\n clone = fabric.util.object.clone,\n coordProps = { x1: 1, x2: 1, y1: 1, y2: 1 },\n supportsLineDash = fabric.StaticCanvas.supports('setLineDash');\n\n if (fabric.Line) {\n fabric.warn('fabric.Line is already defined');\n return;\n }\n\n /**\n * Line class\n * @class fabric.Line\n * @extends fabric.Object\n * @see {@link fabric.Line#initialize} for constructor definition\n */\n fabric.Line = fabric.util.createClass(fabric.Object, /** @lends fabric.Line.prototype */ {\n\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'line',\n\n /**\n * x value or first line edge\n * @type Number\n * @default\n */\n x1: 0,\n\n /**\n * y value or first line edge\n * @type Number\n * @default\n */\n y1: 0,\n\n /**\n * x value or second line edge\n * @type Number\n * @default\n */\n x2: 0,\n\n /**\n * y value or second line edge\n * @type Number\n * @default\n */\n y2: 0,\n\n cacheProperties: fabric.Object.prototype.cacheProperties.concat('x1', 'x2', 'y1', 'y2'),\n\n /**\n * Constructor\n * @param {Array} [points] Array of points\n * @param {Object} [options] Options object\n * @return {fabric.Line} thisArg\n */\n initialize: function(points, options) {\n if (!points) {\n points = [0, 0, 0, 0];\n }\n\n this.callSuper('initialize', options);\n\n this.set('x1', points[0]);\n this.set('y1', points[1]);\n this.set('x2', points[2]);\n this.set('y2', points[3]);\n\n this._setWidthHeight(options);\n },\n\n /**\n * @private\n * @param {Object} [options] Options\n */\n _setWidthHeight: function(options) {\n options || (options = { });\n\n this.width = Math.abs(this.x2 - this.x1);\n this.height = Math.abs(this.y2 - this.y1);\n\n this.left = 'left' in options\n ? options.left\n : this._getLeftToOriginX();\n\n this.top = 'top' in options\n ? options.top\n : this._getTopToOriginY();\n },\n\n /**\n * @private\n * @param {String} key\n * @param {*} value\n */\n _set: function(key, value) {\n this.callSuper('_set', key, value);\n if (typeof coordProps[key] !== 'undefined') {\n this._setWidthHeight();\n }\n return this;\n },\n\n /**\n * @private\n * @return {Number} leftToOriginX Distance from left edge of canvas to originX of Line.\n */\n _getLeftToOriginX: makeEdgeToOriginGetter(\n { // property names\n origin: 'originX',\n axis1: 'x1',\n axis2: 'x2',\n dimension: 'width'\n },\n { // possible values of origin\n nearest: 'left',\n center: 'center',\n farthest: 'right'\n }\n ),\n\n /**\n * @private\n * @return {Number} topToOriginY Distance from top edge of canvas to originY of Line.\n */\n _getTopToOriginY: makeEdgeToOriginGetter(\n { // property names\n origin: 'originY',\n axis1: 'y1',\n axis2: 'y2',\n dimension: 'height'\n },\n { // possible values of origin\n nearest: 'top',\n center: 'center',\n farthest: 'bottom'\n }\n ),\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _render: function(ctx) {\n ctx.beginPath();\n\n if (!this.strokeDashArray || this.strokeDashArray && supportsLineDash) {\n // move from center (of virtual box) to its left/top corner\n // we can't assume x1, y1 is top left and x2, y2 is bottom right\n var p = this.calcLinePoints();\n ctx.moveTo(p.x1, p.y1);\n ctx.lineTo(p.x2, p.y2);\n }\n\n ctx.lineWidth = this.strokeWidth;\n\n // TODO: test this\n // make sure setting \"fill\" changes color of a line\n // (by copying fillStyle to strokeStyle, since line is stroked, not filled)\n var origStrokeStyle = ctx.strokeStyle;\n ctx.strokeStyle = this.stroke || ctx.fillStyle;\n this.stroke && this._renderStroke(ctx);\n ctx.strokeStyle = origStrokeStyle;\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderDashedStroke: function(ctx) {\n var p = this.calcLinePoints();\n\n ctx.beginPath();\n fabric.util.drawDashedLine(ctx, p.x1, p.y1, p.x2, p.y2, this.strokeDashArray);\n ctx.closePath();\n },\n\n /**\n * This function is an helper for svg import. it returns the center of the object in the svg\n * untransformed coordinates\n * @private\n * @return {Object} center point from element coordinates\n */\n _findCenterFromElement: function() {\n return {\n x: (this.x1 + this.x2) / 2,\n y: (this.y1 + this.y2) / 2,\n };\n },\n\n /**\n * Returns object representation of an instance\n * @methd toObject\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} object representation of an instance\n */\n toObject: function(propertiesToInclude) {\n return extend(this.callSuper('toObject', propertiesToInclude), this.calcLinePoints());\n },\n\n /*\n * Calculate object dimensions from its properties\n * @private\n */\n _getNonTransformedDimensions: function() {\n var dim = this.callSuper('_getNonTransformedDimensions');\n if (this.strokeLineCap === 'butt') {\n if (this.width === 0) {\n dim.y -= this.strokeWidth;\n }\n if (this.height === 0) {\n dim.x -= this.strokeWidth;\n }\n }\n return dim;\n },\n\n /**\n * Recalculates line points given width and height\n * @private\n */\n calcLinePoints: function() {\n var xMult = this.x1 <= this.x2 ? -1 : 1,\n yMult = this.y1 <= this.y2 ? -1 : 1,\n x1 = (xMult * this.width * 0.5),\n y1 = (yMult * this.height * 0.5),\n x2 = (xMult * this.width * -0.5),\n y2 = (yMult * this.height * -0.5);\n\n return {\n x1: x1,\n x2: x2,\n y1: y1,\n y2: y2\n };\n },\n\n /* _TO_SVG_START_ */\n /**\n * Returns svg representation of an instance\n * @return {Array} an array of strings with the specific svg representation\n * of the instance\n */\n _toSVG: function() {\n var p = this.calcLinePoints();\n return [\n '<line ', 'COMMON_PARTS',\n 'x1=\"', p.x1,\n '\" y1=\"', p.y1,\n '\" x2=\"', p.x2,\n '\" y2=\"', p.y2,\n '\" />\\n'\n ];\n },\n /* _TO_SVG_END_ */\n });\n\n /* _FROM_SVG_START_ */\n /**\n * List of attribute names to account for when parsing SVG element (used by {@link fabric.Line.fromElement})\n * @static\n * @memberOf fabric.Line\n * @see http://www.w3.org/TR/SVG/shapes.html#LineElement\n */\n fabric.Line.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat('x1 y1 x2 y2'.split(' '));\n\n /**\n * Returns fabric.Line instance from an SVG element\n * @static\n * @memberOf fabric.Line\n * @param {SVGElement} element Element to parse\n * @param {Object} [options] Options object\n * @param {Function} [callback] callback function invoked after parsing\n */\n fabric.Line.fromElement = function(element, callback, options) {\n options = options || { };\n var parsedAttributes = fabric.parseAttributes(element, fabric.Line.ATTRIBUTE_NAMES),\n points = [\n parsedAttributes.x1 || 0,\n parsedAttributes.y1 || 0,\n parsedAttributes.x2 || 0,\n parsedAttributes.y2 || 0\n ];\n callback(new fabric.Line(points, extend(parsedAttributes, options)));\n };\n /* _FROM_SVG_END_ */\n\n /**\n * Returns fabric.Line instance from an object representation\n * @static\n * @memberOf fabric.Line\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] invoked with new instance as first argument\n */\n fabric.Line.fromObject = function(object, callback) {\n function _callback(instance) {\n delete instance.points;\n callback && callback(instance);\n };\n var options = clone(object, true);\n options.points = [object.x1, object.y1, object.x2, object.y2];\n fabric.Object._fromObject('Line', options, _callback, 'points');\n };\n\n /**\n * Produces a function that calculates distance from canvas edge to Line origin.\n */\n function makeEdgeToOriginGetter(propertyNames, originValues) {\n var origin = propertyNames.origin,\n axis1 = propertyNames.axis1,\n axis2 = propertyNames.axis2,\n dimension = propertyNames.dimension,\n nearest = originValues.nearest,\n center = originValues.center,\n farthest = originValues.farthest;\n\n return function() {\n switch (this.get(origin)) {\n case nearest:\n return Math.min(this.get(axis1), this.get(axis2));\n case center:\n return Math.min(this.get(axis1), this.get(axis2)) + (0.5 * this.get(dimension));\n case farthest:\n return Math.max(this.get(axis1), this.get(axis2));\n }\n };\n\n }\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }),\n pi = Math.PI;\n\n if (fabric.Circle) {\n fabric.warn('fabric.Circle is already defined.');\n return;\n }\n\n /**\n * Circle class\n * @class fabric.Circle\n * @extends fabric.Object\n * @see {@link fabric.Circle#initialize} for constructor definition\n */\n fabric.Circle = fabric.util.createClass(fabric.Object, /** @lends fabric.Circle.prototype */ {\n\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'circle',\n\n /**\n * Radius of this circle\n * @type Number\n * @default\n */\n radius: 0,\n\n /**\n * Start angle of the circle, moving clockwise\n * deprectated type, this should be in degree, this was an oversight.\n * probably will change to degrees in next major version\n * @type Number\n * @default 0\n */\n startAngle: 0,\n\n /**\n * End angle of the circle\n * deprectated type, this should be in degree, this was an oversight.\n * probably will change to degrees in next major version\n * @type Number\n * @default 2Pi\n */\n endAngle: pi * 2,\n\n cacheProperties: fabric.Object.prototype.cacheProperties.concat('radius', 'startAngle', 'endAngle'),\n\n /**\n * @private\n * @param {String} key\n * @param {*} value\n * @return {fabric.Circle} thisArg\n */\n _set: function(key, value) {\n this.callSuper('_set', key, value);\n\n if (key === 'radius') {\n this.setRadius(value);\n }\n\n return this;\n },\n\n /**\n * Returns object representation of an instance\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} object representation of an instance\n */\n toObject: function(propertiesToInclude) {\n return this.callSuper('toObject', ['radius', 'startAngle', 'endAngle'].concat(propertiesToInclude));\n },\n\n /* _TO_SVG_START_ */\n\n /**\n * Returns svg representation of an instance\n * @return {Array} an array of strings with the specific svg representation\n * of the instance\n */\n _toSVG: function() {\n var svgString, x = 0, y = 0,\n angle = (this.endAngle - this.startAngle) % ( 2 * pi);\n\n if (angle === 0) {\n svgString = [\n '<circle ', 'COMMON_PARTS',\n 'cx=\"' + x + '\" cy=\"' + y + '\" ',\n 'r=\"', this.radius,\n '\" />\\n'\n ];\n }\n else {\n var startX = fabric.util.cos(this.startAngle) * this.radius,\n startY = fabric.util.sin(this.startAngle) * this.radius,\n endX = fabric.util.cos(this.endAngle) * this.radius,\n endY = fabric.util.sin(this.endAngle) * this.radius,\n largeFlag = angle > pi ? '1' : '0';\n svgString = [\n '<path d=\"M ' + startX + ' ' + startY,\n ' A ' + this.radius + ' ' + this.radius,\n ' 0 ', +largeFlag + ' 1', ' ' + endX + ' ' + endY,\n '\" ', 'COMMON_PARTS', ' />\\n'\n ];\n }\n return svgString;\n },\n /* _TO_SVG_END_ */\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx context to render on\n */\n _render: function(ctx) {\n ctx.beginPath();\n ctx.arc(\n 0,\n 0,\n this.radius,\n this.startAngle,\n this.endAngle, false);\n this._renderPaintInOrder(ctx);\n },\n\n /**\n * Returns horizontal radius of an object (according to how an object is scaled)\n * @return {Number}\n */\n getRadiusX: function() {\n return this.get('radius') * this.get('scaleX');\n },\n\n /**\n * Returns vertical radius of an object (according to how an object is scaled)\n * @return {Number}\n */\n getRadiusY: function() {\n return this.get('radius') * this.get('scaleY');\n },\n\n /**\n * Sets radius of an object (and updates width accordingly)\n * @return {fabric.Circle} thisArg\n */\n setRadius: function(value) {\n this.radius = value;\n return this.set('width', value * 2).set('height', value * 2);\n },\n });\n\n /* _FROM_SVG_START_ */\n /**\n * List of attribute names to account for when parsing SVG element (used by {@link fabric.Circle.fromElement})\n * @static\n * @memberOf fabric.Circle\n * @see: http://www.w3.org/TR/SVG/shapes.html#CircleElement\n */\n fabric.Circle.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat('cx cy r'.split(' '));\n\n /**\n * Returns {@link fabric.Circle} instance from an SVG element\n * @static\n * @memberOf fabric.Circle\n * @param {SVGElement} element Element to parse\n * @param {Function} [callback] Options callback invoked after parsing is finished\n * @param {Object} [options] Options object\n * @throws {Error} If value of `r` attribute is missing or invalid\n */\n fabric.Circle.fromElement = function(element, callback) {\n var parsedAttributes = fabric.parseAttributes(element, fabric.Circle.ATTRIBUTE_NAMES);\n\n if (!isValidRadius(parsedAttributes)) {\n throw new Error('value of `r` attribute is required and can not be negative');\n }\n\n parsedAttributes.left = (parsedAttributes.left || 0) - parsedAttributes.radius;\n parsedAttributes.top = (parsedAttributes.top || 0) - parsedAttributes.radius;\n callback(new fabric.Circle(parsedAttributes));\n };\n\n /**\n * @private\n */\n function isValidRadius(attributes) {\n return (('radius' in attributes) && (attributes.radius >= 0));\n }\n /* _FROM_SVG_END_ */\n\n /**\n * Returns {@link fabric.Circle} instance from an object representation\n * @static\n * @memberOf fabric.Circle\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] invoked with new instance as first argument\n * @return {Object} Instance of fabric.Circle\n */\n fabric.Circle.fromObject = function(object, callback) {\n return fabric.Object._fromObject('Circle', object, callback);\n };\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { });\n\n if (fabric.Triangle) {\n fabric.warn('fabric.Triangle is already defined');\n return;\n }\n\n /**\n * Triangle class\n * @class fabric.Triangle\n * @extends fabric.Object\n * @return {fabric.Triangle} thisArg\n * @see {@link fabric.Triangle#initialize} for constructor definition\n */\n fabric.Triangle = fabric.util.createClass(fabric.Object, /** @lends fabric.Triangle.prototype */ {\n\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'triangle',\n\n /**\n * Width is set to 100 to compensate the old initialize code that was setting it to 100\n * @type Number\n * @default\n */\n width: 100,\n\n /**\n * Height is set to 100 to compensate the old initialize code that was setting it to 100\n * @type Number\n * @default\n */\n height: 100,\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _render: function(ctx) {\n var widthBy2 = this.width / 2,\n heightBy2 = this.height / 2;\n\n ctx.beginPath();\n ctx.moveTo(-widthBy2, heightBy2);\n ctx.lineTo(0, -heightBy2);\n ctx.lineTo(widthBy2, heightBy2);\n ctx.closePath();\n\n this._renderPaintInOrder(ctx);\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderDashedStroke: function(ctx) {\n var widthBy2 = this.width / 2,\n heightBy2 = this.height / 2;\n\n ctx.beginPath();\n fabric.util.drawDashedLine(ctx, -widthBy2, heightBy2, 0, -heightBy2, this.strokeDashArray);\n fabric.util.drawDashedLine(ctx, 0, -heightBy2, widthBy2, heightBy2, this.strokeDashArray);\n fabric.util.drawDashedLine(ctx, widthBy2, heightBy2, -widthBy2, heightBy2, this.strokeDashArray);\n ctx.closePath();\n },\n\n /* _TO_SVG_START_ */\n /**\n * Returns svg representation of an instance\n * @return {Array} an array of strings with the specific svg representation\n * of the instance\n */\n _toSVG: function() {\n var widthBy2 = this.width / 2,\n heightBy2 = this.height / 2,\n points = [\n -widthBy2 + ' ' + heightBy2,\n '0 ' + -heightBy2,\n widthBy2 + ' ' + heightBy2\n ].join(',');\n return [\n '<polygon ', 'COMMON_PARTS',\n 'points=\"', points,\n '\" />'\n ];\n },\n /* _TO_SVG_END_ */\n });\n\n /**\n * Returns {@link fabric.Triangle} instance from an object representation\n * @static\n * @memberOf fabric.Triangle\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] invoked with new instance as first argument\n */\n fabric.Triangle.fromObject = function(object, callback) {\n return fabric.Object._fromObject('Triangle', object, callback);\n };\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }),\n piBy2 = Math.PI * 2;\n\n if (fabric.Ellipse) {\n fabric.warn('fabric.Ellipse is already defined.');\n return;\n }\n\n /**\n * Ellipse class\n * @class fabric.Ellipse\n * @extends fabric.Object\n * @return {fabric.Ellipse} thisArg\n * @see {@link fabric.Ellipse#initialize} for constructor definition\n */\n fabric.Ellipse = fabric.util.createClass(fabric.Object, /** @lends fabric.Ellipse.prototype */ {\n\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'ellipse',\n\n /**\n * Horizontal radius\n * @type Number\n * @default\n */\n rx: 0,\n\n /**\n * Vertical radius\n * @type Number\n * @default\n */\n ry: 0,\n\n cacheProperties: fabric.Object.prototype.cacheProperties.concat('rx', 'ry'),\n\n /**\n * Constructor\n * @param {Object} [options] Options object\n * @return {fabric.Ellipse} thisArg\n */\n initialize: function(options) {\n this.callSuper('initialize', options);\n this.set('rx', options && options.rx || 0);\n this.set('ry', options && options.ry || 0);\n },\n\n /**\n * @private\n * @param {String} key\n * @param {*} value\n * @return {fabric.Ellipse} thisArg\n */\n _set: function(key, value) {\n this.callSuper('_set', key, value);\n switch (key) {\n\n case 'rx':\n this.rx = value;\n this.set('width', value * 2);\n break;\n\n case 'ry':\n this.ry = value;\n this.set('height', value * 2);\n break;\n\n }\n return this;\n },\n\n /**\n * Returns horizontal radius of an object (according to how an object is scaled)\n * @return {Number}\n */\n getRx: function() {\n return this.get('rx') * this.get('scaleX');\n },\n\n /**\n * Returns Vertical radius of an object (according to how an object is scaled)\n * @return {Number}\n */\n getRy: function() {\n return this.get('ry') * this.get('scaleY');\n },\n\n /**\n * Returns object representation of an instance\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} object representation of an instance\n */\n toObject: function(propertiesToInclude) {\n return this.callSuper('toObject', ['rx', 'ry'].concat(propertiesToInclude));\n },\n\n /* _TO_SVG_START_ */\n /**\n * Returns svg representation of an instance\n * @return {Array} an array of strings with the specific svg representation\n * of the instance\n */\n _toSVG: function() {\n return [\n '<ellipse ', 'COMMON_PARTS',\n 'cx=\"0\" cy=\"0\" ',\n 'rx=\"', this.rx,\n '\" ry=\"', this.ry,\n '\" />\\n'\n ];\n },\n /* _TO_SVG_END_ */\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx context to render on\n */\n _render: function(ctx) {\n ctx.beginPath();\n ctx.save();\n ctx.transform(1, 0, 0, this.ry / this.rx, 0, 0);\n ctx.arc(\n 0,\n 0,\n this.rx,\n 0,\n piBy2,\n false);\n ctx.restore();\n this._renderPaintInOrder(ctx);\n },\n });\n\n /* _FROM_SVG_START_ */\n /**\n * List of attribute names to account for when parsing SVG element (used by {@link fabric.Ellipse.fromElement})\n * @static\n * @memberOf fabric.Ellipse\n * @see http://www.w3.org/TR/SVG/shapes.html#EllipseElement\n */\n fabric.Ellipse.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat('cx cy rx ry'.split(' '));\n\n /**\n * Returns {@link fabric.Ellipse} instance from an SVG element\n * @static\n * @memberOf fabric.Ellipse\n * @param {SVGElement} element Element to parse\n * @param {Function} [callback] Options callback invoked after parsing is finished\n * @return {fabric.Ellipse}\n */\n fabric.Ellipse.fromElement = function(element, callback) {\n\n var parsedAttributes = fabric.parseAttributes(element, fabric.Ellipse.ATTRIBUTE_NAMES);\n\n parsedAttributes.left = (parsedAttributes.left || 0) - parsedAttributes.rx;\n parsedAttributes.top = (parsedAttributes.top || 0) - parsedAttributes.ry;\n callback(new fabric.Ellipse(parsedAttributes));\n };\n /* _FROM_SVG_END_ */\n\n /**\n * Returns {@link fabric.Ellipse} instance from an object representation\n * @static\n * @memberOf fabric.Ellipse\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] invoked with new instance as first argument\n * @return {fabric.Ellipse}\n */\n fabric.Ellipse.fromObject = function(object, callback) {\n return fabric.Object._fromObject('Ellipse', object, callback);\n };\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }),\n extend = fabric.util.object.extend;\n\n if (fabric.Rect) {\n fabric.warn('fabric.Rect is already defined');\n return;\n }\n\n /**\n * Rectangle class\n * @class fabric.Rect\n * @extends fabric.Object\n * @return {fabric.Rect} thisArg\n * @see {@link fabric.Rect#initialize} for constructor definition\n */\n fabric.Rect = fabric.util.createClass(fabric.Object, /** @lends fabric.Rect.prototype */ {\n\n /**\n * List of properties to consider when checking if state of an object is changed ({@link fabric.Object#hasStateChanged})\n * as well as for history (undo/redo) purposes\n * @type Array\n */\n stateProperties: fabric.Object.prototype.stateProperties.concat('rx', 'ry'),\n\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'rect',\n\n /**\n * Horizontal border radius\n * @type Number\n * @default\n */\n rx: 0,\n\n /**\n * Vertical border radius\n * @type Number\n * @default\n */\n ry: 0,\n\n cacheProperties: fabric.Object.prototype.cacheProperties.concat('rx', 'ry'),\n\n /**\n * Constructor\n * @param {Object} [options] Options object\n * @return {Object} thisArg\n */\n initialize: function(options) {\n this.callSuper('initialize', options);\n this._initRxRy();\n },\n\n /**\n * Initializes rx/ry attributes\n * @private\n */\n _initRxRy: function() {\n if (this.rx && !this.ry) {\n this.ry = this.rx;\n }\n else if (this.ry && !this.rx) {\n this.rx = this.ry;\n }\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _render: function(ctx) {\n\n // 1x1 case (used in spray brush) optimization was removed because\n // with caching and higher zoom level this makes more damage than help\n\n var rx = this.rx ? Math.min(this.rx, this.width / 2) : 0,\n ry = this.ry ? Math.min(this.ry, this.height / 2) : 0,\n w = this.width,\n h = this.height,\n x = -this.width / 2,\n y = -this.height / 2,\n isRounded = rx !== 0 || ry !== 0,\n /* \"magic number\" for bezier approximations of arcs (http://itc.ktu.lt/itc354/Riskus354.pdf) */\n k = 1 - 0.5522847498;\n ctx.beginPath();\n\n ctx.moveTo(x + rx, y);\n\n ctx.lineTo(x + w - rx, y);\n isRounded && ctx.bezierCurveTo(x + w - k * rx, y, x + w, y + k * ry, x + w, y + ry);\n\n ctx.lineTo(x + w, y + h - ry);\n isRounded && ctx.bezierCurveTo(x + w, y + h - k * ry, x + w - k * rx, y + h, x + w - rx, y + h);\n\n ctx.lineTo(x + rx, y + h);\n isRounded && ctx.bezierCurveTo(x + k * rx, y + h, x, y + h - k * ry, x, y + h - ry);\n\n ctx.lineTo(x, y + ry);\n isRounded && ctx.bezierCurveTo(x, y + k * ry, x + k * rx, y, x + rx, y);\n\n ctx.closePath();\n\n this._renderPaintInOrder(ctx);\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderDashedStroke: function(ctx) {\n var x = -this.width / 2,\n y = -this.height / 2,\n w = this.width,\n h = this.height;\n\n ctx.beginPath();\n fabric.util.drawDashedLine(ctx, x, y, x + w, y, this.strokeDashArray);\n fabric.util.drawDashedLine(ctx, x + w, y, x + w, y + h, this.strokeDashArray);\n fabric.util.drawDashedLine(ctx, x + w, y + h, x, y + h, this.strokeDashArray);\n fabric.util.drawDashedLine(ctx, x, y + h, x, y, this.strokeDashArray);\n ctx.closePath();\n },\n\n /**\n * Returns object representation of an instance\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} object representation of an instance\n */\n toObject: function(propertiesToInclude) {\n return this.callSuper('toObject', ['rx', 'ry'].concat(propertiesToInclude));\n },\n\n /* _TO_SVG_START_ */\n /**\n * Returns svg representation of an instance\n * @return {Array} an array of strings with the specific svg representation\n * of the instance\n */\n _toSVG: function() {\n var x = -this.width / 2, y = -this.height / 2;\n return [\n '<rect ', 'COMMON_PARTS',\n 'x=\"', x, '\" y=\"', y,\n '\" rx=\"', this.rx, '\" ry=\"', this.ry,\n '\" width=\"', this.width, '\" height=\"', this.height,\n '\" />\\n'\n ];\n },\n /* _TO_SVG_END_ */\n });\n\n /* _FROM_SVG_START_ */\n /**\n * List of attribute names to account for when parsing SVG element (used by `fabric.Rect.fromElement`)\n * @static\n * @memberOf fabric.Rect\n * @see: http://www.w3.org/TR/SVG/shapes.html#RectElement\n */\n fabric.Rect.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat('x y rx ry width height'.split(' '));\n\n /**\n * Returns {@link fabric.Rect} instance from an SVG element\n * @static\n * @memberOf fabric.Rect\n * @param {SVGElement} element Element to parse\n * @param {Function} callback callback function invoked after parsing\n * @param {Object} [options] Options object\n */\n fabric.Rect.fromElement = function(element, callback, options) {\n if (!element) {\n return callback(null);\n }\n options = options || { };\n\n var parsedAttributes = fabric.parseAttributes(element, fabric.Rect.ATTRIBUTE_NAMES);\n parsedAttributes.left = parsedAttributes.left || 0;\n parsedAttributes.top = parsedAttributes.top || 0;\n parsedAttributes.height = parsedAttributes.height || 0;\n parsedAttributes.width = parsedAttributes.width || 0;\n var rect = new fabric.Rect(extend((options ? fabric.util.object.clone(options) : { }), parsedAttributes));\n rect.visible = rect.visible && rect.width > 0 && rect.height > 0;\n callback(rect);\n };\n /* _FROM_SVG_END_ */\n\n /**\n * Returns {@link fabric.Rect} instance from an object representation\n * @static\n * @memberOf fabric.Rect\n * @param {Object} object Object to create an instance from\n * @param {Function} [callback] Callback to invoke when an fabric.Rect instance is created\n */\n fabric.Rect.fromObject = function(object, callback) {\n return fabric.Object._fromObject('Rect', object, callback);\n };\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }),\n extend = fabric.util.object.extend,\n min = fabric.util.array.min,\n max = fabric.util.array.max,\n toFixed = fabric.util.toFixed;\n\n if (fabric.Polyline) {\n fabric.warn('fabric.Polyline is already defined');\n return;\n }\n\n /**\n * Polyline class\n * @class fabric.Polyline\n * @extends fabric.Object\n * @see {@link fabric.Polyline#initialize} for constructor definition\n */\n fabric.Polyline = fabric.util.createClass(fabric.Object, /** @lends fabric.Polyline.prototype */ {\n\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'polyline',\n\n /**\n * Points array\n * @type Array\n * @default\n */\n points: null,\n\n cacheProperties: fabric.Object.prototype.cacheProperties.concat('points'),\n\n /**\n * Constructor\n * @param {Array} points Array of points (where each point is an object with x and y)\n * @param {Object} [options] Options object\n * @return {fabric.Polyline} thisArg\n * @example\n * var poly = new fabric.Polyline([\n * { x: 10, y: 10 },\n * { x: 50, y: 30 },\n * { x: 40, y: 70 },\n * { x: 60, y: 50 },\n * { x: 100, y: 150 },\n * { x: 40, y: 100 }\n * ], {\n * stroke: 'red',\n * left: 100,\n * top: 100\n * });\n */\n initialize: function(points, options) {\n options = options || {};\n this.points = points || [];\n this.callSuper('initialize', options);\n this._setPositionDimensions(options);\n },\n\n _setPositionDimensions: function(options) {\n var calcDim = this._calcDimensions(options), correctLeftTop;\n this.width = calcDim.width;\n this.height = calcDim.height;\n if (!options.fromSVG) {\n correctLeftTop = this.translateToGivenOrigin(\n { x: calcDim.left - this.strokeWidth / 2, y: calcDim.top - this.strokeWidth / 2 },\n 'left',\n 'top',\n this.originX,\n this.originY\n );\n }\n if (typeof options.left === 'undefined') {\n this.left = options.fromSVG ? calcDim.left : correctLeftTop.x;\n }\n if (typeof options.top === 'undefined') {\n this.top = options.fromSVG ? calcDim.top : correctLeftTop.y;\n }\n this.pathOffset = {\n x: calcDim.left + this.width / 2,\n y: calcDim.top + this.height / 2\n };\n },\n\n /**\n * Calculate the polygon min and max point from points array,\n * returning an object with left, top, widht, height to measure the\n * polygon size\n * @return {Object} object.left X coordinate of the polygon leftmost point\n * @return {Object} object.top Y coordinate of the polygon topmost point\n * @return {Object} object.width distance between X coordinates of the polygon leftmost and rightmost point\n * @return {Object} object.height distance between Y coordinates of the polygon topmost and bottommost point\n * @private\n */\n _calcDimensions: function() {\n\n var points = this.points,\n minX = min(points, 'x') || 0,\n minY = min(points, 'y') || 0,\n maxX = max(points, 'x') || 0,\n maxY = max(points, 'y') || 0,\n width = (maxX - minX),\n height = (maxY - minY);\n\n return {\n left: minX,\n top: minY,\n width: width,\n height: height\n };\n },\n\n /**\n * Returns object representation of an instance\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} Object representation of an instance\n */\n toObject: function(propertiesToInclude) {\n return extend(this.callSuper('toObject', propertiesToInclude), {\n points: this.points.concat()\n });\n },\n\n /* _TO_SVG_START_ */\n /**\n * Returns svg representation of an instance\n * @return {Array} an array of strings with the specific svg representation\n * of the instance\n */\n _toSVG: function() {\n var points = [], diffX = this.pathOffset.x, diffY = this.pathOffset.y,\n NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS;\n\n for (var i = 0, len = this.points.length; i < len; i++) {\n points.push(\n toFixed(this.points[i].x - diffX, NUM_FRACTION_DIGITS), ',',\n toFixed(this.points[i].y - diffY, NUM_FRACTION_DIGITS), ' '\n );\n }\n return [\n '<' + this.type + ' ', 'COMMON_PARTS',\n 'points=\"', points.join(''),\n '\" />\\n'\n ];\n },\n /* _TO_SVG_END_ */\n\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n commonRender: function(ctx) {\n var point, len = this.points.length,\n x = this.pathOffset.x,\n y = this.pathOffset.y;\n\n if (!len || isNaN(this.points[len - 1].y)) {\n // do not draw if no points or odd points\n // NaN comes from parseFloat of a empty string in parser\n return false;\n }\n ctx.beginPath();\n ctx.moveTo(this.points[0].x - x, this.points[0].y - y);\n for (var i = 0; i < len; i++) {\n point = this.points[i];\n ctx.lineTo(point.x - x, point.y - y);\n }\n return true;\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _render: function(ctx) {\n if (!this.commonRender(ctx)) {\n return;\n }\n this._renderPaintInOrder(ctx);\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderDashedStroke: function(ctx) {\n var p1, p2;\n\n ctx.beginPath();\n for (var i = 0, len = this.points.length; i < len; i++) {\n p1 = this.points[i];\n p2 = this.points[i + 1] || p1;\n fabric.util.drawDashedLine(ctx, p1.x, p1.y, p2.x, p2.y, this.strokeDashArray);\n }\n },\n\n /**\n * Returns complexity of an instance\n * @return {Number} complexity of this instance\n */\n complexity: function() {\n return this.get('points').length;\n }\n });\n\n /* _FROM_SVG_START_ */\n /**\n * List of attribute names to account for when parsing SVG element (used by {@link fabric.Polyline.fromElement})\n * @static\n * @memberOf fabric.Polyline\n * @see: http://www.w3.org/TR/SVG/shapes.html#PolylineElement\n */\n fabric.Polyline.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat();\n\n /**\n * Returns fabric.Polyline instance from an SVG element\n * @static\n * @memberOf fabric.Polyline\n * @param {SVGElement} element Element to parser\n * @param {Function} callback callback function invoked after parsing\n * @param {Object} [options] Options object\n */\n fabric.Polyline.fromElementGenerator = function(_class) {\n return function(element, callback, options) {\n if (!element) {\n return callback(null);\n }\n options || (options = { });\n\n var points = fabric.parsePointsAttribute(element.getAttribute('points')),\n parsedAttributes = fabric.parseAttributes(element, fabric[_class].ATTRIBUTE_NAMES);\n parsedAttributes.fromSVG = true;\n callback(new fabric[_class](points, extend(parsedAttributes, options)));\n };\n };\n\n fabric.Polyline.fromElement = fabric.Polyline.fromElementGenerator('Polyline');\n\n /* _FROM_SVG_END_ */\n\n /**\n * Returns fabric.Polyline instance from an object representation\n * @static\n * @memberOf fabric.Polyline\n * @param {Object} object Object to create an instance from\n * @param {Function} [callback] Callback to invoke when an fabric.Path instance is created\n */\n fabric.Polyline.fromObject = function(object, callback) {\n return fabric.Object._fromObject('Polyline', object, callback, 'points');\n };\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { });\n\n if (fabric.Polygon) {\n fabric.warn('fabric.Polygon is already defined');\n return;\n }\n\n /**\n * Polygon class\n * @class fabric.Polygon\n * @extends fabric.Polyline\n * @see {@link fabric.Polygon#initialize} for constructor definition\n */\n fabric.Polygon = fabric.util.createClass(fabric.Polyline, /** @lends fabric.Polygon.prototype */ {\n\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'polygon',\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _render: function(ctx) {\n if (!this.commonRender(ctx)) {\n return;\n }\n ctx.closePath();\n this._renderPaintInOrder(ctx);\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderDashedStroke: function(ctx) {\n this.callSuper('_renderDashedStroke', ctx);\n ctx.closePath();\n },\n });\n\n /* _FROM_SVG_START_ */\n /**\n * List of attribute names to account for when parsing SVG element (used by `fabric.Polygon.fromElement`)\n * @static\n * @memberOf fabric.Polygon\n * @see: http://www.w3.org/TR/SVG/shapes.html#PolygonElement\n */\n fabric.Polygon.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat();\n\n /**\n * Returns {@link fabric.Polygon} instance from an SVG element\n * @static\n * @memberOf fabric.Polygon\n * @param {SVGElement} element Element to parse\n * @param {Function} callback callback function invoked after parsing\n * @param {Object} [options] Options object\n */\n fabric.Polygon.fromElement = fabric.Polyline.fromElementGenerator('Polygon');\n /* _FROM_SVG_END_ */\n\n /**\n * Returns fabric.Polygon instance from an object representation\n * @static\n * @memberOf fabric.Polygon\n * @param {Object} object Object to create an instance from\n * @param {Function} [callback] Callback to invoke when an fabric.Path instance is created\n */\n fabric.Polygon.fromObject = function(object, callback) {\n return fabric.Object._fromObject('Polygon', object, callback, 'points');\n };\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }),\n min = fabric.util.array.min,\n max = fabric.util.array.max,\n extend = fabric.util.object.extend,\n _toString = Object.prototype.toString,\n toFixed = fabric.util.toFixed;\n\n if (fabric.Path) {\n fabric.warn('fabric.Path is already defined');\n return;\n }\n\n /**\n * Path class\n * @class fabric.Path\n * @extends fabric.Object\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-1#path_and_pathgroup}\n * @see {@link fabric.Path#initialize} for constructor definition\n */\n fabric.Path = fabric.util.createClass(fabric.Object, /** @lends fabric.Path.prototype */ {\n\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'path',\n\n /**\n * Array of path points\n * @type Array\n * @default\n */\n path: null,\n\n cacheProperties: fabric.Object.prototype.cacheProperties.concat('path', 'fillRule'),\n\n stateProperties: fabric.Object.prototype.stateProperties.concat('path'),\n\n /**\n * Constructor\n * @param {Array|String} path Path data (sequence of coordinates and corresponding \"command\" tokens)\n * @param {Object} [options] Options object\n * @return {fabric.Path} thisArg\n */\n initialize: function(path, options) {\n options = options || { };\n this.callSuper('initialize', options);\n if (!path) {\n path = [];\n }\n\n var fromArray = _toString.call(path) === '[object Array]';\n\n this.path = fromArray\n ? fabric.util.makePathSimpler(path)\n\n : fabric.util.makePathSimpler(\n fabric.util.parsePath(path)\n );\n\n if (!this.path) {\n return;\n }\n fabric.Polyline.prototype._setPositionDimensions.call(this, options);\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx context to render path on\n */\n _renderPathCommands: function(ctx) {\n var current, // current instruction\n subpathStartX = 0,\n subpathStartY = 0,\n x = 0, // current x\n y = 0, // current y\n controlX = 0, // current control point x\n controlY = 0, // current control point y\n l = -this.pathOffset.x,\n t = -this.pathOffset.y;\n\n ctx.beginPath();\n\n for (var i = 0, len = this.path.length; i < len; ++i) {\n\n current = this.path[i];\n\n switch (current[0]) { // first letter\n\n case 'L': // lineto, absolute\n x = current[1];\n y = current[2];\n ctx.lineTo(x + l, y + t);\n break;\n\n case 'M': // moveTo, absolute\n x = current[1];\n y = current[2];\n subpathStartX = x;\n subpathStartY = y;\n ctx.moveTo(x + l, y + t);\n break;\n\n case 'C': // bezierCurveTo, absolute\n x = current[5];\n y = current[6];\n controlX = current[3];\n controlY = current[4];\n ctx.bezierCurveTo(\n current[1] + l,\n current[2] + t,\n controlX + l,\n controlY + t,\n x + l,\n y + t\n );\n break;\n\n case 'Q': // quadraticCurveTo, absolute\n ctx.quadraticCurveTo(\n current[1] + l,\n current[2] + t,\n current[3] + l,\n current[4] + t\n );\n x = current[3];\n y = current[4];\n controlX = current[1];\n controlY = current[2];\n break;\n\n case 'z':\n case 'Z':\n x = subpathStartX;\n y = subpathStartY;\n ctx.closePath();\n break;\n }\n }\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx context to render path on\n */\n _render: function(ctx) {\n this._renderPathCommands(ctx);\n this._renderPaintInOrder(ctx);\n },\n\n /**\n * Returns string representation of an instance\n * @return {String} string representation of an instance\n */\n toString: function() {\n return '#<fabric.Path (' + this.complexity() +\n '): { \"top\": ' + this.top + ', \"left\": ' + this.left + ' }>';\n },\n\n /**\n * Returns object representation of an instance\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} object representation of an instance\n */\n toObject: function(propertiesToInclude) {\n return extend(this.callSuper('toObject', propertiesToInclude), {\n path: this.path.map(function(item) { return item.slice(); }),\n });\n },\n\n /**\n * Returns dataless object representation of an instance\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} object representation of an instance\n */\n toDatalessObject: function(propertiesToInclude) {\n var o = this.toObject(['sourcePath'].concat(propertiesToInclude));\n if (o.sourcePath) {\n delete o.path;\n }\n return o;\n },\n\n /* _TO_SVG_START_ */\n /**\n * Returns svg representation of an instance\n * @return {Array} an array of strings with the specific svg representation\n * of the instance\n */\n _toSVG: function() {\n var path = this.path.map(function(path) {\n return path.join(' ');\n }).join(' ');\n return [\n '<path ', 'COMMON_PARTS',\n 'd=\"', path,\n '\" stroke-linecap=\"round\" ',\n '/>\\n'\n ];\n },\n\n _getOffsetTransform: function() {\n var digits = fabric.Object.NUM_FRACTION_DIGITS;\n return ' translate(' + toFixed(-this.pathOffset.x, digits) + ', ' +\n toFixed(-this.pathOffset.y, digits) + ')';\n },\n\n /**\n * Returns svg clipPath representation of an instance\n * @param {Function} [reviver] Method for further parsing of svg representation.\n * @return {String} svg representation of an instance\n */\n toClipPathSVG: function(reviver) {\n var additionalTransform = this._getOffsetTransform();\n return '\\t' + this._createBaseClipPathSVGMarkup(\n this._toSVG(), { reviver: reviver, additionalTransform: additionalTransform }\n );\n },\n\n /**\n * Returns svg representation of an instance\n * @param {Function} [reviver] Method for further parsing of svg representation.\n * @return {String} svg representation of an instance\n */\n toSVG: function(reviver) {\n var additionalTransform = this._getOffsetTransform();\n return this._createBaseSVGMarkup(this._toSVG(), { reviver: reviver, additionalTransform: additionalTransform });\n },\n /* _TO_SVG_END_ */\n\n /**\n * Returns number representation of an instance complexity\n * @return {Number} complexity of this instance\n */\n complexity: function() {\n return this.path.length;\n },\n\n /**\n * @private\n */\n _calcDimensions: function() {\n\n var aX = [],\n aY = [],\n current, // current instruction\n subpathStartX = 0,\n subpathStartY = 0,\n x = 0, // current x\n y = 0, // current y\n bounds;\n\n for (var i = 0, len = this.path.length; i < len; ++i) {\n\n current = this.path[i];\n\n switch (current[0]) { // first letter\n\n case 'L': // lineto, absolute\n x = current[1];\n y = current[2];\n bounds = [];\n break;\n\n case 'M': // moveTo, absolute\n x = current[1];\n y = current[2];\n subpathStartX = x;\n subpathStartY = y;\n bounds = [];\n break;\n\n case 'C': // bezierCurveTo, absolute\n bounds = fabric.util.getBoundsOfCurve(x, y,\n current[1],\n current[2],\n current[3],\n current[4],\n current[5],\n current[6]\n );\n x = current[5];\n y = current[6];\n break;\n\n case 'Q': // quadraticCurveTo, absolute\n bounds = fabric.util.getBoundsOfCurve(x, y,\n current[1],\n current[2],\n current[1],\n current[2],\n current[3],\n current[4]\n );\n x = current[3];\n y = current[4];\n break;\n\n case 'z':\n case 'Z':\n x = subpathStartX;\n y = subpathStartY;\n break;\n }\n bounds.forEach(function (point) {\n aX.push(point.x);\n aY.push(point.y);\n });\n aX.push(x);\n aY.push(y);\n }\n\n var minX = min(aX) || 0,\n minY = min(aY) || 0,\n maxX = max(aX) || 0,\n maxY = max(aY) || 0,\n deltaX = maxX - minX,\n deltaY = maxY - minY;\n\n return {\n left: minX,\n top: minY,\n width: deltaX,\n height: deltaY\n };\n }\n });\n\n /**\n * Creates an instance of fabric.Path from an object\n * @static\n * @memberOf fabric.Path\n * @param {Object} object\n * @param {Function} [callback] Callback to invoke when an fabric.Path instance is created\n */\n fabric.Path.fromObject = function(object, callback) {\n if (typeof object.sourcePath === 'string') {\n var pathUrl = object.sourcePath;\n fabric.loadSVGFromURL(pathUrl, function (elements) {\n var path = elements[0];\n path.setOptions(object);\n callback && callback(path);\n });\n }\n else {\n fabric.Object._fromObject('Path', object, callback, 'path');\n }\n };\n\n /* _FROM_SVG_START_ */\n /**\n * List of attribute names to account for when parsing SVG element (used by `fabric.Path.fromElement`)\n * @static\n * @memberOf fabric.Path\n * @see http://www.w3.org/TR/SVG/paths.html#PathElement\n */\n fabric.Path.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat(['d']);\n\n /**\n * Creates an instance of fabric.Path from an SVG <path> element\n * @static\n * @memberOf fabric.Path\n * @param {SVGElement} element to parse\n * @param {Function} callback Callback to invoke when an fabric.Path instance is created\n * @param {Object} [options] Options object\n * @param {Function} [callback] Options callback invoked after parsing is finished\n */\n fabric.Path.fromElement = function(element, callback, options) {\n var parsedAttributes = fabric.parseAttributes(element, fabric.Path.ATTRIBUTE_NAMES);\n parsedAttributes.fromSVG = true;\n callback(new fabric.Path(parsedAttributes.d, extend(parsedAttributes, options)));\n };\n /* _FROM_SVG_END_ */\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }),\n min = fabric.util.array.min,\n max = fabric.util.array.max;\n\n if (fabric.Group) {\n return;\n }\n\n /**\n * Group class\n * @class fabric.Group\n * @extends fabric.Object\n * @mixes fabric.Collection\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-3#groups}\n * @see {@link fabric.Group#initialize} for constructor definition\n */\n fabric.Group = fabric.util.createClass(fabric.Object, fabric.Collection, /** @lends fabric.Group.prototype */ {\n\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'group',\n\n /**\n * Width of stroke\n * @type Number\n * @default\n */\n strokeWidth: 0,\n\n /**\n * Indicates if click, mouseover, mouseout events & hoverCursor should also check for subtargets\n * @type Boolean\n * @default\n */\n subTargetCheck: false,\n\n /**\n * Groups are container, do not render anything on theyr own, ence no cache properties\n * @type Array\n * @default\n */\n cacheProperties: [],\n\n /**\n * setOnGroup is a method used for TextBox that is no more used since 2.0.0 The behavior is still\n * available setting this boolean to true.\n * @type Boolean\n * @since 2.0.0\n * @default\n */\n useSetOnGroup: false,\n\n /**\n * Constructor\n * @param {Object} objects Group objects\n * @param {Object} [options] Options object\n * @param {Boolean} [isAlreadyGrouped] if true, objects have been grouped already.\n * @return {Object} thisArg\n */\n initialize: function(objects, options, isAlreadyGrouped) {\n options = options || {};\n this._objects = [];\n // if objects enclosed in a group have been grouped already,\n // we cannot change properties of objects.\n // Thus we need to set options to group without objects,\n isAlreadyGrouped && this.callSuper('initialize', options);\n this._objects = objects || [];\n for (var i = this._objects.length; i--; ) {\n this._objects[i].group = this;\n }\n\n if (!isAlreadyGrouped) {\n var center = options && options.centerPoint;\n // we want to set origins before calculating the bounding box.\n // so that the topleft can be set with that in mind.\n // if specific top and left are passed, are overwritten later\n // with the callSuper('initialize', options)\n if (options.originX !== undefined) {\n this.originX = options.originX;\n }\n if (options.originY !== undefined) {\n this.originY = options.originY;\n }\n // if coming from svg i do not want to calc bounds.\n // i assume width and height are passed along options\n center || this._calcBounds();\n this._updateObjectsCoords(center);\n delete options.centerPoint;\n this.callSuper('initialize', options);\n }\n else {\n this._updateObjectsACoords();\n }\n\n this.setCoords();\n },\n\n /**\n * @private\n */\n _updateObjectsACoords: function() {\n var skipControls = true;\n for (var i = this._objects.length; i--; ){\n this._objects[i].setCoords(skipControls);\n }\n },\n\n /**\n * @private\n * @param {Boolean} [skipCoordsChange] if true, coordinates of objects enclosed in a group do not change\n */\n _updateObjectsCoords: function(center) {\n var center = center || this.getCenterPoint();\n for (var i = this._objects.length; i--; ){\n this._updateObjectCoords(this._objects[i], center);\n }\n },\n\n /**\n * @private\n * @param {Object} object\n * @param {fabric.Point} center, current center of group.\n */\n _updateObjectCoords: function(object, center) {\n var objectLeft = object.left,\n objectTop = object.top,\n skipControls = true;\n\n object.set({\n left: objectLeft - center.x,\n top: objectTop - center.y\n });\n object.group = this;\n object.setCoords(skipControls);\n },\n\n /**\n * Returns string represenation of a group\n * @return {String}\n */\n toString: function() {\n return '#<fabric.Group: (' + this.complexity() + ')>';\n },\n\n /**\n * Adds an object to a group; Then recalculates group's dimension, position.\n * @param {Object} object\n * @return {fabric.Group} thisArg\n * @chainable\n */\n addWithUpdate: function(object) {\n this._restoreObjectsState();\n fabric.util.resetObjectTransform(this);\n if (object) {\n this._objects.push(object);\n object.group = this;\n object._set('canvas', this.canvas);\n }\n this._calcBounds();\n this._updateObjectsCoords();\n this.setCoords();\n this.dirty = true;\n return this;\n },\n\n /**\n * Removes an object from a group; Then recalculates group's dimension, position.\n * @param {Object} object\n * @return {fabric.Group} thisArg\n * @chainable\n */\n removeWithUpdate: function(object) {\n this._restoreObjectsState();\n fabric.util.resetObjectTransform(this);\n\n this.remove(object);\n this._calcBounds();\n this._updateObjectsCoords();\n this.setCoords();\n this.dirty = true;\n return this;\n },\n\n /**\n * @private\n */\n _onObjectAdded: function(object) {\n this.dirty = true;\n object.group = this;\n object._set('canvas', this.canvas);\n },\n\n /**\n * @private\n */\n _onObjectRemoved: function(object) {\n this.dirty = true;\n delete object.group;\n },\n\n /**\n * @private\n */\n _set: function(key, value) {\n var i = this._objects.length;\n if (this.useSetOnGroup) {\n while (i--) {\n this._objects[i].setOnGroup(key, value);\n }\n }\n if (key === 'canvas') {\n while (i--) {\n this._objects[i]._set(key, value);\n }\n }\n fabric.Object.prototype._set.call(this, key, value);\n },\n\n /**\n * Returns object representation of an instance\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} object representation of an instance\n */\n toObject: function(propertiesToInclude) {\n var _includeDefaultValues = this.includeDefaultValues;\n var objsToObject = this._objects.map(function(obj) {\n var originalDefaults = obj.includeDefaultValues;\n obj.includeDefaultValues = _includeDefaultValues;\n var _obj = obj.toObject(propertiesToInclude);\n obj.includeDefaultValues = originalDefaults;\n return _obj;\n });\n var obj = fabric.Object.prototype.toObject.call(this, propertiesToInclude);\n obj.objects = objsToObject;\n return obj;\n },\n\n /**\n * Returns object representation of an instance, in dataless mode.\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} object representation of an instance\n */\n toDatalessObject: function(propertiesToInclude) {\n var objsToObject, sourcePath = this.sourcePath;\n if (sourcePath) {\n objsToObject = sourcePath;\n }\n else {\n var _includeDefaultValues = this.includeDefaultValues;\n objsToObject = this._objects.map(function(obj) {\n var originalDefaults = obj.includeDefaultValues;\n obj.includeDefaultValues = _includeDefaultValues;\n var _obj = obj.toDatalessObject(propertiesToInclude);\n obj.includeDefaultValues = originalDefaults;\n return _obj;\n });\n }\n var obj = fabric.Object.prototype.toDatalessObject.call(this, propertiesToInclude);\n obj.objects = objsToObject;\n return obj;\n },\n\n /**\n * Renders instance on a given context\n * @param {CanvasRenderingContext2D} ctx context to render instance on\n */\n render: function(ctx) {\n this._transformDone = true;\n this.callSuper('render', ctx);\n this._transformDone = false;\n },\n\n /**\n * Decide if the object should cache or not. Create its own cache level\n * needsItsOwnCache should be used when the object drawing method requires\n * a cache step. None of the fabric classes requires it.\n * Generally you do not cache objects in groups because the group is already cached.\n * @return {Boolean}\n */\n shouldCache: function() {\n var ownCache = fabric.Object.prototype.shouldCache.call(this);\n if (ownCache) {\n for (var i = 0, len = this._objects.length; i < len; i++) {\n if (this._objects[i].willDrawShadow()) {\n this.ownCaching = false;\n return false;\n }\n }\n }\n return ownCache;\n },\n\n /**\n * Check if this object or a child object will cast a shadow\n * @return {Boolean}\n */\n willDrawShadow: function() {\n if (fabric.Object.prototype.willDrawShadow.call(this)) {\n return true;\n }\n for (var i = 0, len = this._objects.length; i < len; i++) {\n if (this._objects[i].willDrawShadow()) {\n return true;\n }\n }\n return false;\n },\n\n /**\n * Check if this group or its parent group are caching, recursively up\n * @return {Boolean}\n */\n isOnACache: function() {\n return this.ownCaching || (this.group && this.group.isOnACache());\n },\n\n /**\n * Execute the drawing operation for an object on a specified context\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n drawObject: function(ctx) {\n for (var i = 0, len = this._objects.length; i < len; i++) {\n this._objects[i].render(ctx);\n }\n this._drawClipPath(ctx);\n },\n\n /**\n * Check if cache is dirty\n */\n isCacheDirty: function(skipCanvas) {\n if (this.callSuper('isCacheDirty', skipCanvas)) {\n return true;\n }\n if (!this.statefullCache) {\n return false;\n }\n for (var i = 0, len = this._objects.length; i < len; i++) {\n if (this._objects[i].isCacheDirty(true)) {\n if (this._cacheCanvas) {\n // if this group has not a cache canvas there is nothing to clean\n var x = this.cacheWidth / this.zoomX, y = this.cacheHeight / this.zoomY;\n this._cacheContext.clearRect(-x / 2, -y / 2, x, y);\n }\n return true;\n }\n }\n return false;\n },\n\n /**\n * Retores original state of each of group objects (original state is that which was before group was created).\n * @private\n * @return {fabric.Group} thisArg\n * @chainable\n */\n _restoreObjectsState: function() {\n this._objects.forEach(this._restoreObjectState, this);\n return this;\n },\n\n /**\n * Realises the transform from this group onto the supplied object\n * i.e. it tells you what would happen if the supplied object was in\n * the group, and then the group was destroyed. It mutates the supplied\n * object.\n * @param {fabric.Object} object\n * @return {fabric.Object} transformedObject\n */\n realizeTransform: function(object) {\n var matrix = object.calcTransformMatrix(),\n options = fabric.util.qrDecompose(matrix),\n center = new fabric.Point(options.translateX, options.translateY);\n object.flipX = false;\n object.flipY = false;\n object.set('scaleX', options.scaleX);\n object.set('scaleY', options.scaleY);\n object.skewX = options.skewX;\n object.skewY = options.skewY;\n object.angle = options.angle;\n object.setPositionByOrigin(center, 'center', 'center');\n return object;\n },\n\n /**\n * Restores original state of a specified object in group\n * @private\n * @param {fabric.Object} object\n * @return {fabric.Group} thisArg\n */\n _restoreObjectState: function(object) {\n this.realizeTransform(object);\n delete object.group;\n object.setCoords();\n return this;\n },\n\n /**\n * Destroys a group (restoring state of its objects)\n * @return {fabric.Group} thisArg\n * @chainable\n */\n destroy: function() {\n // when group is destroyed objects needs to get a repaint to be eventually\n // displayed on canvas.\n this._objects.forEach(function(object) {\n object.set('dirty', true);\n });\n return this._restoreObjectsState();\n },\n\n /**\n * make a group an active selection, remove the group from canvas\n * the group has to be on canvas for this to work.\n * @return {fabric.ActiveSelection} thisArg\n * @chainable\n */\n toActiveSelection: function() {\n if (!this.canvas) {\n return;\n }\n var objects = this._objects, canvas = this.canvas;\n this._objects = [];\n var options = this.toObject();\n delete options.objects;\n var activeSelection = new fabric.ActiveSelection([]);\n activeSelection.set(options);\n activeSelection.type = 'activeSelection';\n canvas.remove(this);\n objects.forEach(function(object) {\n object.group = activeSelection;\n object.dirty = true;\n canvas.add(object);\n });\n activeSelection.canvas = canvas;\n activeSelection._objects = objects;\n canvas._activeObject = activeSelection;\n activeSelection.setCoords();\n return activeSelection;\n },\n\n /**\n * Destroys a group (restoring state of its objects)\n * @return {fabric.Group} thisArg\n * @chainable\n */\n ungroupOnCanvas: function() {\n return this._restoreObjectsState();\n },\n\n /**\n * Sets coordinates of all objects inside group\n * @return {fabric.Group} thisArg\n * @chainable\n */\n setObjectsCoords: function() {\n var skipControls = true;\n this.forEachObject(function(object) {\n object.setCoords(skipControls);\n });\n return this;\n },\n\n /**\n * @private\n */\n _calcBounds: function(onlyWidthHeight) {\n var aX = [],\n aY = [],\n o, prop,\n props = ['tr', 'br', 'bl', 'tl'],\n i = 0, iLen = this._objects.length,\n j, jLen = props.length;\n\n for ( ; i < iLen; ++i) {\n o = this._objects[i];\n o.aCoords = o.calcACoords();\n for (j = 0; j < jLen; j++) {\n prop = props[j];\n aX.push(o.aCoords[prop].x);\n aY.push(o.aCoords[prop].y);\n }\n }\n\n this._getBounds(aX, aY, onlyWidthHeight);\n },\n\n /**\n * @private\n */\n _getBounds: function(aX, aY, onlyWidthHeight) {\n var minXY = new fabric.Point(min(aX), min(aY)),\n maxXY = new fabric.Point(max(aX), max(aY)),\n top = minXY.y || 0, left = minXY.x || 0,\n width = (maxXY.x - minXY.x) || 0,\n height = (maxXY.y - minXY.y) || 0;\n this.width = width;\n this.height = height;\n if (!onlyWidthHeight) {\n // the bounding box always finds the topleft most corner.\n // whatever is the group origin, we set up here the left/top position.\n this.setPositionByOrigin({ x: left, y: top }, 'left', 'top');\n }\n },\n\n /* _TO_SVG_START_ */\n /**\n * Returns svg representation of an instance\n * @param {Function} [reviver] Method for further parsing of svg representation.\n * @return {String} svg representation of an instance\n */\n _toSVG: function(reviver) {\n var svgString = ['<g ', 'COMMON_PARTS', ' >\\n'];\n\n for (var i = 0, len = this._objects.length; i < len; i++) {\n svgString.push('\\t\\t', this._objects[i].toSVG(reviver));\n }\n svgString.push('</g>\\n');\n return svgString;\n },\n\n /**\n * Returns styles-string for svg-export, specific version for group\n * @return {String}\n */\n getSvgStyles: function() {\n var opacity = typeof this.opacity !== 'undefined' && this.opacity !== 1 ?\n 'opacity: ' + this.opacity + ';' : '',\n visibility = this.visible ? '' : ' visibility: hidden;';\n return [\n opacity,\n this.getSvgFilter(),\n visibility\n ].join('');\n },\n\n /**\n * Returns svg clipPath representation of an instance\n * @param {Function} [reviver] Method for further parsing of svg representation.\n * @return {String} svg representation of an instance\n */\n toClipPathSVG: function(reviver) {\n var svgString = [];\n\n for (var i = 0, len = this._objects.length; i < len; i++) {\n svgString.push('\\t', this._objects[i].toClipPathSVG(reviver));\n }\n\n return this._createBaseClipPathSVGMarkup(svgString, { reviver: reviver });\n },\n /* _TO_SVG_END_ */\n });\n\n /**\n * Returns {@link fabric.Group} instance from an object representation\n * @static\n * @memberOf fabric.Group\n * @param {Object} object Object to create a group from\n * @param {Function} [callback] Callback to invoke when an group instance is created\n */\n fabric.Group.fromObject = function(object, callback) {\n var objects = object.objects,\n options = fabric.util.object.clone(object, true);\n delete options.objects;\n if (typeof objects === 'string') {\n // it has to be an url or something went wrong.\n fabric.loadSVGFromURL(objects, function (elements) {\n var group = fabric.util.groupSVGElements(elements, object, objects);\n group.set(options);\n callback && callback(group);\n });\n return;\n }\n fabric.util.enlivenObjects(objects, function(enlivenedObjects) {\n fabric.util.enlivenObjects([object.clipPath], function(enlivedClipPath) {\n var options = fabric.util.object.clone(object, true);\n options.clipPath = enlivedClipPath[0];\n delete options.objects;\n callback && callback(new fabric.Group(enlivenedObjects, options, true));\n });\n });\n };\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { });\n\n if (fabric.ActiveSelection) {\n return;\n }\n\n /**\n * Group class\n * @class fabric.ActiveSelection\n * @extends fabric.Group\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-3#groups}\n * @see {@link fabric.ActiveSelection#initialize} for constructor definition\n */\n fabric.ActiveSelection = fabric.util.createClass(fabric.Group, /** @lends fabric.ActiveSelection.prototype */ {\n\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'activeSelection',\n\n /**\n * Constructor\n * @param {Object} objects ActiveSelection objects\n * @param {Object} [options] Options object\n * @return {Object} thisArg\n */\n initialize: function(objects, options) {\n options = options || {};\n this._objects = objects || [];\n for (var i = this._objects.length; i--; ) {\n this._objects[i].group = this;\n }\n\n if (options.originX) {\n this.originX = options.originX;\n }\n if (options.originY) {\n this.originY = options.originY;\n }\n this._calcBounds();\n this._updateObjectsCoords();\n fabric.Object.prototype.initialize.call(this, options);\n this.setCoords();\n },\n\n /**\n * Change te activeSelection to a normal group,\n * High level function that automatically adds it to canvas as\n * active object. no events fired.\n * @since 2.0.0\n * @return {fabric.Group}\n */\n toGroup: function() {\n var objects = this._objects.concat();\n this._objects = [];\n var options = fabric.Object.prototype.toObject.call(this);\n var newGroup = new fabric.Group([]);\n delete options.type;\n newGroup.set(options);\n objects.forEach(function(object) {\n object.canvas.remove(object);\n object.group = newGroup;\n });\n newGroup._objects = objects;\n if (!this.canvas) {\n return newGroup;\n }\n var canvas = this.canvas;\n canvas.add(newGroup);\n canvas._activeObject = newGroup;\n newGroup.setCoords();\n return newGroup;\n },\n\n /**\n * If returns true, deselection is cancelled.\n * @since 2.0.0\n * @return {Boolean} [cancel]\n */\n onDeselect: function() {\n this.destroy();\n return false;\n },\n\n /**\n * Returns string representation of a group\n * @return {String}\n */\n toString: function() {\n return '#<fabric.ActiveSelection: (' + this.complexity() + ')>';\n },\n\n /**\n * Decide if the object should cache or not. Create its own cache level\n * objectCaching is a global flag, wins over everything\n * needsItsOwnCache should be used when the object drawing method requires\n * a cache step. None of the fabric classes requires it.\n * Generally you do not cache objects in groups because the group outside is cached.\n * @return {Boolean}\n */\n shouldCache: function() {\n return false;\n },\n\n /**\n * Check if this group or its parent group are caching, recursively up\n * @return {Boolean}\n */\n isOnACache: function() {\n return false;\n },\n\n /**\n * Renders controls and borders for the object\n * @param {CanvasRenderingContext2D} ctx Context to render on\n * @param {Object} [styleOverride] properties to override the object style\n * @param {Object} [childrenOverride] properties to override the children overrides\n */\n _renderControls: function(ctx, styleOverride, childrenOverride) {\n ctx.save();\n ctx.globalAlpha = this.isMoving ? this.borderOpacityWhenMoving : 1;\n this.callSuper('_renderControls', ctx, styleOverride);\n childrenOverride = childrenOverride || { };\n if (typeof childrenOverride.hasControls === 'undefined') {\n childrenOverride.hasControls = false;\n }\n childrenOverride.forActiveSelection = true;\n for (var i = 0, len = this._objects.length; i < len; i++) {\n this._objects[i]._renderControls(ctx, childrenOverride);\n }\n ctx.restore();\n },\n });\n\n /**\n * Returns {@link fabric.ActiveSelection} instance from an object representation\n * @static\n * @memberOf fabric.ActiveSelection\n * @param {Object} object Object to create a group from\n * @param {Function} [callback] Callback to invoke when an ActiveSelection instance is created\n */\n fabric.ActiveSelection.fromObject = function(object, callback) {\n fabric.util.enlivenObjects(object.objects, function(enlivenedObjects) {\n delete object.objects;\n callback && callback(new fabric.ActiveSelection(enlivenedObjects, object, true));\n });\n };\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var extend = fabric.util.object.extend;\n\n if (!global.fabric) {\n global.fabric = { };\n }\n\n if (global.fabric.Image) {\n fabric.warn('fabric.Image is already defined.');\n return;\n }\n\n /**\n * Image class\n * @class fabric.Image\n * @extends fabric.Object\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-1#images}\n * @see {@link fabric.Image#initialize} for constructor definition\n */\n fabric.Image = fabric.util.createClass(fabric.Object, /** @lends fabric.Image.prototype */ {\n\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'image',\n\n /**\n * Width of a stroke.\n * For image quality a stroke multiple of 2 gives better results.\n * @type Number\n * @default\n */\n strokeWidth: 0,\n\n /**\n * When calling {@link fabric.Image.getSrc}, return value from element src with `element.getAttribute('src')`.\n * This allows for relative urls as image src.\n * @since 2.7.0\n * @type Boolean\n * @default\n */\n srcFromAttribute: false,\n\n /**\n * private\n * contains last value of scaleX to detect\n * if the Image got resized after the last Render\n * @type Number\n */\n _lastScaleX: 1,\n\n /**\n * private\n * contains last value of scaleY to detect\n * if the Image got resized after the last Render\n * @type Number\n */\n _lastScaleY: 1,\n\n /**\n * private\n * contains last value of scaling applied by the apply filter chain\n * @type Number\n */\n _filterScalingX: 1,\n\n /**\n * private\n * contains last value of scaling applied by the apply filter chain\n * @type Number\n */\n _filterScalingY: 1,\n\n /**\n * minimum scale factor under which any resizeFilter is triggered to resize the image\n * 0 will disable the automatic resize. 1 will trigger automatically always.\n * number bigger than 1 are not implemented yet.\n * @type Number\n */\n minimumScaleTrigger: 0.5,\n\n /**\n * List of properties to consider when checking if\n * state of an object is changed ({@link fabric.Object#hasStateChanged})\n * as well as for history (undo/redo) purposes\n * @type Array\n */\n stateProperties: fabric.Object.prototype.stateProperties.concat('cropX', 'cropY'),\n\n /**\n * key used to retrieve the texture representing this image\n * @since 2.0.0\n * @type String\n * @default\n */\n cacheKey: '',\n\n /**\n * Image crop in pixels from original image size.\n * @since 2.0.0\n * @type Number\n * @default\n */\n cropX: 0,\n\n /**\n * Image crop in pixels from original image size.\n * @since 2.0.0\n * @type Number\n * @default\n */\n cropY: 0,\n\n /**\n * Indicates whether this canvas will use image smoothing when painting this image.\n * Also influence if the cacheCanvas for this image uses imageSmoothing\n * @since 4.0.0-beta.11\n * @type Boolean\n * @default\n */\n imageSmoothing: true,\n\n /**\n * Constructor\n * @param {HTMLImageElement | String} element Image element\n * @param {Object} [options] Options object\n * @param {function} [callback] callback function to call after eventual filters applied.\n * @return {fabric.Image} thisArg\n */\n initialize: function(element, options) {\n options || (options = { });\n this.filters = [];\n this.cacheKey = 'texture' + fabric.Object.__uid++;\n this.callSuper('initialize', options);\n this._initElement(element, options);\n },\n\n /**\n * Returns image element which this instance if based on\n * @return {HTMLImageElement} Image element\n */\n getElement: function() {\n return this._element || {};\n },\n\n /**\n * Sets image element for this instance to a specified one.\n * If filters defined they are applied to new image.\n * You might need to call `canvas.renderAll` and `object.setCoords` after replacing, to render new image and update controls area.\n * @param {HTMLImageElement} element\n * @param {Object} [options] Options object\n * @return {fabric.Image} thisArg\n * @chainable\n */\n setElement: function(element, options) {\n this.removeTexture(this.cacheKey);\n this.removeTexture(this.cacheKey + '_filtered');\n this._element = element;\n this._originalElement = element;\n this._initConfig(options);\n if (this.filters.length !== 0) {\n this.applyFilters();\n }\n // resizeFilters work on the already filtered copy.\n // we need to apply resizeFilters AFTER normal filters.\n // applyResizeFilters is run more often than normal fiters\n // and is triggered by user interactions rather than dev code\n if (this.resizeFilter) {\n this.applyResizeFilters();\n }\n return this;\n },\n\n /**\n * Delete a single texture if in webgl mode\n */\n removeTexture: function(key) {\n var backend = fabric.filterBackend;\n if (backend && backend.evictCachesForKey) {\n backend.evictCachesForKey(key);\n }\n },\n\n /**\n * Delete textures, reference to elements and eventually JSDOM cleanup\n */\n dispose: function() {\n this.removeTexture(this.cacheKey);\n this.removeTexture(this.cacheKey + '_filtered');\n this._cacheContext = undefined;\n ['_originalElement', '_element', '_filteredEl', '_cacheCanvas'].forEach((function(element) {\n fabric.util.cleanUpJsdomNode(this[element]);\n this[element] = undefined;\n }).bind(this));\n },\n\n /**\n * Get the crossOrigin value (of the corresponding image element)\n */\n getCrossOrigin: function() {\n return this._originalElement && (this._originalElement.crossOrigin || null);\n },\n\n /**\n * Returns original size of an image\n * @return {Object} Object with \"width\" and \"height\" properties\n */\n getOriginalSize: function() {\n var element = this.getElement();\n return {\n width: element.naturalWidth || element.width,\n height: element.naturalHeight || element.height\n };\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _stroke: function(ctx) {\n if (!this.stroke || this.strokeWidth === 0) {\n return;\n }\n var w = this.width / 2, h = this.height / 2;\n ctx.beginPath();\n ctx.moveTo(-w, -h);\n ctx.lineTo(w, -h);\n ctx.lineTo(w, h);\n ctx.lineTo(-w, h);\n ctx.lineTo(-w, -h);\n ctx.closePath();\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderDashedStroke: function(ctx) {\n var x = -this.width / 2,\n y = -this.height / 2,\n w = this.width,\n h = this.height;\n\n ctx.save();\n this._setStrokeStyles(ctx, this);\n\n ctx.beginPath();\n fabric.util.drawDashedLine(ctx, x, y, x + w, y, this.strokeDashArray);\n fabric.util.drawDashedLine(ctx, x + w, y, x + w, y + h, this.strokeDashArray);\n fabric.util.drawDashedLine(ctx, x + w, y + h, x, y + h, this.strokeDashArray);\n fabric.util.drawDashedLine(ctx, x, y + h, x, y, this.strokeDashArray);\n ctx.closePath();\n ctx.restore();\n },\n\n /**\n * Returns object representation of an instance\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} Object representation of an instance\n */\n toObject: function(propertiesToInclude) {\n var filters = [];\n\n this.filters.forEach(function(filterObj) {\n if (filterObj) {\n filters.push(filterObj.toObject());\n }\n });\n var object = extend(\n this.callSuper(\n 'toObject',\n ['cropX', 'cropY'].concat(propertiesToInclude)\n ), {\n src: this.getSrc(),\n crossOrigin: this.getCrossOrigin(),\n filters: filters,\n });\n if (this.resizeFilter) {\n object.resizeFilter = this.resizeFilter.toObject();\n }\n return object;\n },\n\n /**\n * Returns true if an image has crop applied, inspecting values of cropX,cropY,width,hight.\n * @return {Boolean}\n */\n hasCrop: function() {\n return this.cropX || this.cropY || this.width < this._element.width || this.height < this._element.height;\n },\n\n /* _TO_SVG_START_ */\n /**\n * Returns svg representation of an instance\n * @return {Array} an array of strings with the specific svg representation\n * of the instance\n */\n _toSVG: function() {\n var svgString = [], imageMarkup = [], strokeSvg, element = this._element,\n x = -this.width / 2, y = -this.height / 2, clipPath = '', imageRendering = '';\n if (!element) {\n return [];\n }\n if (this.hasCrop()) {\n var clipPathId = fabric.Object.__uid++;\n svgString.push(\n '<clipPath id=\"imageCrop_' + clipPathId + '\">\\n',\n '\\t<rect x=\"' + x + '\" y=\"' + y + '\" width=\"' + this.width + '\" height=\"' + this.height + '\" />\\n',\n '</clipPath>\\n'\n );\n clipPath = ' clip-path=\"url(#imageCrop_' + clipPathId + ')\" ';\n }\n if (!this.imageSmoothing) {\n imageRendering = '\" image-rendering=\"optimizeSpeed';\n }\n imageMarkup.push('\\t<image ', 'COMMON_PARTS', 'xlink:href=\"', this.getSvgSrc(true),\n '\" x=\"', x - this.cropX, '\" y=\"', y - this.cropY,\n // we're essentially moving origin of transformation from top/left corner to the center of the shape\n // by wrapping it in container <g> element with actual transformation, then offsetting object to the top/left\n // so that object's center aligns with container's left/top\n '\" width=\"', element.width || element.naturalWidth,\n '\" height=\"', element.height || element.height,\n imageRendering,\n '\"', clipPath,\n '></image>\\n');\n\n if (this.stroke || this.strokeDashArray) {\n var origFill = this.fill;\n this.fill = null;\n strokeSvg = [\n '\\t<rect ',\n 'x=\"', x, '\" y=\"', y,\n '\" width=\"', this.width, '\" height=\"', this.height,\n '\" style=\"', this.getSvgStyles(),\n '\"/>\\n'\n ];\n this.fill = origFill;\n }\n if (this.paintFirst !== 'fill') {\n svgString = svgString.concat(strokeSvg, imageMarkup);\n }\n else {\n svgString = svgString.concat(imageMarkup, strokeSvg);\n }\n return svgString;\n },\n /* _TO_SVG_END_ */\n\n /**\n * Returns source of an image\n * @param {Boolean} filtered indicates if the src is needed for svg\n * @return {String} Source of an image\n */\n getSrc: function(filtered) {\n var element = filtered ? this._element : this._originalElement;\n if (element) {\n if (element.toDataURL) {\n return element.toDataURL();\n }\n\n if (this.srcFromAttribute) {\n return element.getAttribute('src');\n }\n else {\n return element.src;\n }\n }\n else {\n return this.src || '';\n }\n },\n\n /**\n * Sets source of an image\n * @param {String} src Source string (URL)\n * @param {Function} [callback] Callback is invoked when image has been loaded (and all filters have been applied)\n * @param {Object} [options] Options object\n * @param {String} [options.crossOrigin] crossOrigin value (one of \"\", \"anonymous\", \"use-credentials\")\n * @see https://developer.mozilla.org/en-US/docs/HTML/CORS_settings_attributes\n * @return {fabric.Image} thisArg\n * @chainable\n */\n setSrc: function(src, callback, options) {\n fabric.util.loadImage(src, function(img, isError) {\n this.setElement(img, options);\n this._setWidthHeight();\n callback && callback(this, isError);\n }, this, options && options.crossOrigin);\n return this;\n },\n\n /**\n * Returns string representation of an instance\n * @return {String} String representation of an instance\n */\n toString: function() {\n return '#<fabric.Image: { src: \"' + this.getSrc() + '\" }>';\n },\n\n applyResizeFilters: function() {\n var filter = this.resizeFilter,\n minimumScale = this.minimumScaleTrigger,\n objectScale = this.getTotalObjectScaling(),\n scaleX = objectScale.scaleX,\n scaleY = objectScale.scaleY,\n elementToFilter = this._filteredEl || this._originalElement;\n if (this.group) {\n this.set('dirty', true);\n }\n if (!filter || (scaleX > minimumScale && scaleY > minimumScale)) {\n this._element = elementToFilter;\n this._filterScalingX = 1;\n this._filterScalingY = 1;\n this._lastScaleX = scaleX;\n this._lastScaleY = scaleY;\n return;\n }\n if (!fabric.filterBackend) {\n fabric.filterBackend = fabric.initFilterBackend();\n }\n var canvasEl = fabric.util.createCanvasElement(),\n cacheKey = this._filteredEl ? (this.cacheKey + '_filtered') : this.cacheKey,\n sourceWidth = elementToFilter.width, sourceHeight = elementToFilter.height;\n canvasEl.width = sourceWidth;\n canvasEl.height = sourceHeight;\n this._element = canvasEl;\n this._lastScaleX = filter.scaleX = scaleX;\n this._lastScaleY = filter.scaleY = scaleY;\n fabric.filterBackend.applyFilters(\n [filter], elementToFilter, sourceWidth, sourceHeight, this._element, cacheKey);\n this._filterScalingX = canvasEl.width / this._originalElement.width;\n this._filterScalingY = canvasEl.height / this._originalElement.height;\n },\n\n /**\n * Applies filters assigned to this image (from \"filters\" array) or from filter param\n * @method applyFilters\n * @param {Array} filters to be applied\n * @param {Boolean} forResizing specify if the filter operation is a resize operation\n * @return {thisArg} return the fabric.Image object\n * @chainable\n */\n applyFilters: function(filters) {\n\n filters = filters || this.filters || [];\n filters = filters.filter(function(filter) { return filter && !filter.isNeutralState(); });\n this.set('dirty', true);\n\n // needs to clear out or WEBGL will not resize correctly\n this.removeTexture(this.cacheKey + '_filtered');\n\n if (filters.length === 0) {\n this._element = this._originalElement;\n this._filteredEl = null;\n this._filterScalingX = 1;\n this._filterScalingY = 1;\n return this;\n }\n\n var imgElement = this._originalElement,\n sourceWidth = imgElement.naturalWidth || imgElement.width,\n sourceHeight = imgElement.naturalHeight || imgElement.height;\n\n if (this._element === this._originalElement) {\n // if the element is the same we need to create a new element\n var canvasEl = fabric.util.createCanvasElement();\n canvasEl.width = sourceWidth;\n canvasEl.height = sourceHeight;\n this._element = canvasEl;\n this._filteredEl = canvasEl;\n }\n else {\n // clear the existing element to get new filter data\n // also dereference the eventual resized _element\n this._element = this._filteredEl;\n this._filteredEl.getContext('2d').clearRect(0, 0, sourceWidth, sourceHeight);\n // we also need to resize again at next renderAll, so remove saved _lastScaleX/Y\n this._lastScaleX = 1;\n this._lastScaleY = 1;\n }\n if (!fabric.filterBackend) {\n fabric.filterBackend = fabric.initFilterBackend();\n }\n fabric.filterBackend.applyFilters(\n filters, this._originalElement, sourceWidth, sourceHeight, this._element, this.cacheKey);\n if (this._originalElement.width !== this._element.width ||\n this._originalElement.height !== this._element.height) {\n this._filterScalingX = this._element.width / this._originalElement.width;\n this._filterScalingY = this._element.height / this._originalElement.height;\n }\n return this;\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _render: function(ctx) {\n fabric.util.setImageSmoothing(ctx, this.imageSmoothing);\n if (this.isMoving !== true && this.resizeFilter && this._needsResize()) {\n this.applyResizeFilters();\n }\n this._stroke(ctx);\n this._renderPaintInOrder(ctx);\n },\n\n /**\n * Paint the cached copy of the object on the target context.\n * it will set the imageSmoothing for the draw operation\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n drawCacheOnCanvas: function(ctx) {\n fabric.util.setImageSmoothing(ctx, this.imageSmoothing);\n fabric.Object.prototype.drawCacheOnCanvas.call(this, ctx);\n },\n\n /**\n * Decide if the object should cache or not. Create its own cache level\n * needsItsOwnCache should be used when the object drawing method requires\n * a cache step. None of the fabric classes requires it.\n * Generally you do not cache objects in groups because the group outside is cached.\n * This is the special image version where we would like to avoid caching where possible.\n * Essentially images do not benefit from caching. They may require caching, and in that\n * case we do it. Also caching an image usually ends in a loss of details.\n * A full performance audit should be done.\n * @return {Boolean}\n */\n shouldCache: function() {\n return this.needsItsOwnCache();\n },\n\n _renderFill: function(ctx) {\n var elementToDraw = this._element;\n if (!elementToDraw) {\n return;\n }\n var scaleX = this._filterScalingX, scaleY = this._filterScalingY,\n w = this.width, h = this.height, min = Math.min, max = Math.max,\n // crop values cannot be lesser than 0.\n cropX = max(this.cropX, 0), cropY = max(this.cropY, 0),\n elWidth = elementToDraw.naturalWidth || elementToDraw.width,\n elHeight = elementToDraw.naturalHeight || elementToDraw.height,\n sX = cropX * scaleX,\n sY = cropY * scaleY,\n // the width height cannot exceed element width/height, starting from the crop offset.\n sW = min(w * scaleX, elWidth - sX),\n sH = min(h * scaleY, elHeight - sY),\n x = -w / 2, y = -h / 2,\n maxDestW = min(w, elWidth / scaleX - cropX),\n maxDestH = min(h, elHeight / scaleX - cropY);\n\n elementToDraw && ctx.drawImage(elementToDraw, sX, sY, sW, sH, x, y, maxDestW, maxDestH);\n },\n\n /**\n * needed to check if image needs resize\n * @private\n */\n _needsResize: function() {\n var scale = this.getTotalObjectScaling();\n return (scale.scaleX !== this._lastScaleX || scale.scaleY !== this._lastScaleY);\n },\n\n /**\n * @private\n */\n _resetWidthHeight: function() {\n this.set(this.getOriginalSize());\n },\n\n /**\n * The Image class's initialization method. This method is automatically\n * called by the constructor.\n * @private\n * @param {HTMLImageElement|String} element The element representing the image\n * @param {Object} [options] Options object\n */\n _initElement: function(element, options) {\n this.setElement(fabric.util.getById(element), options);\n fabric.util.addClass(this.getElement(), fabric.Image.CSS_CANVAS);\n },\n\n /**\n * @private\n * @param {Object} [options] Options object\n */\n _initConfig: function(options) {\n options || (options = { });\n this.setOptions(options);\n this._setWidthHeight(options);\n },\n\n /**\n * @private\n * @param {Array} filters to be initialized\n * @param {Function} callback Callback to invoke when all fabric.Image.filters instances are created\n */\n _initFilters: function(filters, callback) {\n if (filters && filters.length) {\n fabric.util.enlivenObjects(filters, function(enlivenedObjects) {\n callback && callback(enlivenedObjects);\n }, 'fabric.Image.filters');\n }\n else {\n callback && callback();\n }\n },\n\n /**\n * @private\n * Set the width and the height of the image object, using the element or the\n * options.\n * @param {Object} [options] Object with width/height properties\n */\n _setWidthHeight: function(options) {\n options || (options = { });\n var el = this.getElement();\n this.width = options.width || el.naturalWidth || el.width || 0;\n this.height = options.height || el.naturalHeight || el.height || 0;\n },\n\n /**\n * Calculate offset for center and scale factor for the image in order to respect\n * the preserveAspectRatio attribute\n * @private\n * @return {Object}\n */\n parsePreserveAspectRatioAttribute: function() {\n var pAR = fabric.util.parsePreserveAspectRatioAttribute(this.preserveAspectRatio || ''),\n rWidth = this._element.width, rHeight = this._element.height,\n scaleX = 1, scaleY = 1, offsetLeft = 0, offsetTop = 0, cropX = 0, cropY = 0,\n offset, pWidth = this.width, pHeight = this.height, parsedAttributes = { width: pWidth, height: pHeight };\n if (pAR && (pAR.alignX !== 'none' || pAR.alignY !== 'none')) {\n if (pAR.meetOrSlice === 'meet') {\n scaleX = scaleY = fabric.util.findScaleToFit(this._element, parsedAttributes);\n offset = (pWidth - rWidth * scaleX) / 2;\n if (pAR.alignX === 'Min') {\n offsetLeft = -offset;\n }\n if (pAR.alignX === 'Max') {\n offsetLeft = offset;\n }\n offset = (pHeight - rHeight * scaleY) / 2;\n if (pAR.alignY === 'Min') {\n offsetTop = -offset;\n }\n if (pAR.alignY === 'Max') {\n offsetTop = offset;\n }\n }\n if (pAR.meetOrSlice === 'slice') {\n scaleX = scaleY = fabric.util.findScaleToCover(this._element, parsedAttributes);\n offset = rWidth - pWidth / scaleX;\n if (pAR.alignX === 'Mid') {\n cropX = offset / 2;\n }\n if (pAR.alignX === 'Max') {\n cropX = offset;\n }\n offset = rHeight - pHeight / scaleY;\n if (pAR.alignY === 'Mid') {\n cropY = offset / 2;\n }\n if (pAR.alignY === 'Max') {\n cropY = offset;\n }\n rWidth = pWidth / scaleX;\n rHeight = pHeight / scaleY;\n }\n }\n else {\n scaleX = pWidth / rWidth;\n scaleY = pHeight / rHeight;\n }\n return {\n width: rWidth,\n height: rHeight,\n scaleX: scaleX,\n scaleY: scaleY,\n offsetLeft: offsetLeft,\n offsetTop: offsetTop,\n cropX: cropX,\n cropY: cropY\n };\n }\n });\n\n /**\n * Default CSS class name for canvas\n * @static\n * @type String\n * @default\n */\n fabric.Image.CSS_CANVAS = 'canvas-img';\n\n /**\n * Alias for getSrc\n * @static\n */\n fabric.Image.prototype.getSvgSrc = fabric.Image.prototype.getSrc;\n\n /**\n * Creates an instance of fabric.Image from its object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {Function} callback Callback to invoke when an image instance is created\n */\n fabric.Image.fromObject = function(_object, callback) {\n var object = fabric.util.object.clone(_object);\n fabric.util.loadImage(object.src, function(img, isError) {\n if (isError) {\n callback && callback(null, true);\n return;\n }\n fabric.Image.prototype._initFilters.call(object, object.filters, function(filters) {\n object.filters = filters || [];\n fabric.Image.prototype._initFilters.call(object, [object.resizeFilter], function(resizeFilters) {\n object.resizeFilter = resizeFilters[0];\n fabric.util.enlivenObjects([object.clipPath], function(enlivedProps) {\n object.clipPath = enlivedProps[0];\n var image = new fabric.Image(img, object);\n callback(image, false);\n });\n });\n });\n }, null, object.crossOrigin);\n };\n\n /**\n * Creates an instance of fabric.Image from an URL string\n * @static\n * @param {String} url URL to create an image from\n * @param {Function} [callback] Callback to invoke when image is created (newly created image is passed as a first argument). Second argument is a boolean indicating if an error occured or not.\n * @param {Object} [imgOptions] Options object\n */\n fabric.Image.fromURL = function(url, callback, imgOptions) {\n fabric.util.loadImage(url, function(img, isError) {\n callback && callback(new fabric.Image(img, imgOptions), isError);\n }, null, imgOptions && imgOptions.crossOrigin);\n };\n\n /* _FROM_SVG_START_ */\n /**\n * List of attribute names to account for when parsing SVG element (used by {@link fabric.Image.fromElement})\n * @static\n * @see {@link http://www.w3.org/TR/SVG/struct.html#ImageElement}\n */\n fabric.Image.ATTRIBUTE_NAMES =\n fabric.SHARED_ATTRIBUTES.concat(\n 'x y width height preserveAspectRatio xlink:href crossOrigin image-rendering'.split(' ')\n );\n\n /**\n * Returns {@link fabric.Image} instance from an SVG element\n * @static\n * @param {SVGElement} element Element to parse\n * @param {Object} [options] Options object\n * @param {Function} callback Callback to execute when fabric.Image object is created\n * @return {fabric.Image} Instance of fabric.Image\n */\n fabric.Image.fromElement = function(element, callback, options) {\n var parsedAttributes = fabric.parseAttributes(element, fabric.Image.ATTRIBUTE_NAMES);\n fabric.Image.fromURL(parsedAttributes['xlink:href'], callback,\n extend((options ? fabric.util.object.clone(options) : { }), parsedAttributes));\n };\n /* _FROM_SVG_END_ */\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\nfabric.util.object.extend(fabric.Object.prototype, /** @lends fabric.Object.prototype */ {\n\n /**\n * @private\n * @return {Number} angle value\n */\n _getAngleValueForStraighten: function() {\n var angle = this.angle % 360;\n if (angle > 0) {\n return Math.round((angle - 1) / 90) * 90;\n }\n return Math.round(angle / 90) * 90;\n },\n\n /**\n * Straightens an object (rotating it from current angle to one of 0, 90, 180, 270, etc. depending on which is closer)\n * @return {fabric.Object} thisArg\n * @chainable\n */\n straighten: function() {\n this.rotate(this._getAngleValueForStraighten());\n return this;\n },\n\n /**\n * Same as {@link fabric.Object.prototype.straighten} but with animation\n * @param {Object} callbacks Object with callback functions\n * @param {Function} [callbacks.onComplete] Invoked on completion\n * @param {Function} [callbacks.onChange] Invoked on every step of animation\n * @return {fabric.Object} thisArg\n * @chainable\n */\n fxStraighten: function(callbacks) {\n callbacks = callbacks || { };\n\n var empty = function() { },\n onComplete = callbacks.onComplete || empty,\n onChange = callbacks.onChange || empty,\n _this = this;\n\n fabric.util.animate({\n startValue: this.get('angle'),\n endValue: this._getAngleValueForStraighten(),\n duration: this.FX_DURATION,\n onChange: function(value) {\n _this.rotate(value);\n onChange();\n },\n onComplete: function() {\n _this.setCoords();\n onComplete();\n },\n });\n\n return this;\n }\n});\n\nfabric.util.object.extend(fabric.StaticCanvas.prototype, /** @lends fabric.StaticCanvas.prototype */ {\n\n /**\n * Straightens object, then rerenders canvas\n * @param {fabric.Object} object Object to straighten\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n straightenObject: function (object) {\n object.straighten();\n this.requestRenderAll();\n return this;\n },\n\n /**\n * Same as {@link fabric.Canvas.prototype.straightenObject}, but animated\n * @param {fabric.Object} object Object to straighten\n * @return {fabric.Canvas} thisArg\n * @chainable\n */\n fxStraightenObject: function (object) {\n object.fxStraighten({\n onChange: this.requestRenderAllBound\n });\n return this;\n }\n});\n\n\n(function() {\n\n 'use strict';\n\n /**\n * Tests if webgl supports certain precision\n * @param {WebGL} Canvas WebGL context to test on\n * @param {String} Precision to test can be any of following: 'lowp', 'mediump', 'highp'\n * @returns {Boolean} Whether the user's browser WebGL supports given precision.\n */\n function testPrecision(gl, precision){\n var fragmentSource = 'precision ' + precision + ' float;\\nvoid main(){}';\n var fragmentShader = gl.createShader(gl.FRAGMENT_SHADER);\n gl.shaderSource(fragmentShader, fragmentSource);\n gl.compileShader(fragmentShader);\n if (!gl.getShaderParameter(fragmentShader, gl.COMPILE_STATUS)) {\n return false;\n }\n return true;\n }\n\n /**\n * Indicate whether this filtering backend is supported by the user's browser.\n * @param {Number} tileSize check if the tileSize is supported\n * @returns {Boolean} Whether the user's browser supports WebGL.\n */\n fabric.isWebglSupported = function(tileSize) {\n if (fabric.isLikelyNode) {\n return false;\n }\n tileSize = tileSize || fabric.WebglFilterBackend.prototype.tileSize;\n var canvas = document.createElement('canvas');\n var gl = canvas.getContext('webgl') || canvas.getContext('experimental-webgl');\n var isSupported = false;\n // eslint-disable-next-line\n if (gl) {\n fabric.maxTextureSize = gl.getParameter(gl.MAX_TEXTURE_SIZE);\n isSupported = fabric.maxTextureSize >= tileSize;\n var precisions = ['highp', 'mediump', 'lowp'];\n for (var i = 0; i < 3; i++){\n if (testPrecision(gl, precisions[i])){\n fabric.webGlPrecision = precisions[i];\n break;\n };\n }\n }\n this.isSupported = isSupported;\n return isSupported;\n };\n\n fabric.WebglFilterBackend = WebglFilterBackend;\n\n /**\n * WebGL filter backend.\n */\n function WebglFilterBackend(options) {\n if (options && options.tileSize) {\n this.tileSize = options.tileSize;\n }\n this.setupGLContext(this.tileSize, this.tileSize);\n this.captureGPUInfo();\n };\n\n WebglFilterBackend.prototype = /** @lends fabric.WebglFilterBackend.prototype */ {\n\n tileSize: 2048,\n\n /**\n * Experimental. This object is a sort of repository of help layers used to avoid\n * of recreating them during frequent filtering. If you are previewing a filter with\n * a slider you problably do not want to create help layers every filter step.\n * in this object there will be appended some canvases, created once, resized sometimes\n * cleared never. Clearing is left to the developer.\n **/\n resources: {\n\n },\n\n /**\n * Setup a WebGL context suitable for filtering, and bind any needed event handlers.\n */\n setupGLContext: function(width, height) {\n this.dispose();\n this.createWebGLCanvas(width, height);\n // eslint-disable-next-line\n this.aPosition = new Float32Array([0, 0, 0, 1, 1, 0, 1, 1]);\n this.chooseFastestCopyGLTo2DMethod(width, height);\n },\n\n /**\n * Pick a method to copy data from GL context to 2d canvas. In some browsers using\n * putImageData is faster than drawImage for that specific operation.\n */\n chooseFastestCopyGLTo2DMethod: function(width, height) {\n var canMeasurePerf = typeof window.performance !== 'undefined', canUseImageData;\n try {\n new ImageData(1, 1);\n canUseImageData = true;\n }\n catch (e) {\n canUseImageData = false;\n }\n // eslint-disable-next-line no-undef\n var canUseArrayBuffer = typeof ArrayBuffer !== 'undefined';\n // eslint-disable-next-line no-undef\n var canUseUint8Clamped = typeof Uint8ClampedArray !== 'undefined';\n\n if (!(canMeasurePerf && canUseImageData && canUseArrayBuffer && canUseUint8Clamped)) {\n return;\n }\n\n var targetCanvas = fabric.util.createCanvasElement();\n // eslint-disable-next-line no-undef\n var imageBuffer = new ArrayBuffer(width * height * 4);\n if (fabric.forceGLPutImageData) {\n this.imageBuffer = imageBuffer;\n this.copyGLTo2D = copyGLTo2DPutImageData;\n return;\n }\n var testContext = {\n imageBuffer: imageBuffer,\n destinationWidth: width,\n destinationHeight: height,\n targetCanvas: targetCanvas\n };\n var startTime, drawImageTime, putImageDataTime;\n targetCanvas.width = width;\n targetCanvas.height = height;\n\n startTime = window.performance.now();\n copyGLTo2DDrawImage.call(testContext, this.gl, testContext);\n drawImageTime = window.performance.now() - startTime;\n\n startTime = window.performance.now();\n copyGLTo2DPutImageData.call(testContext, this.gl, testContext);\n putImageDataTime = window.performance.now() - startTime;\n\n if (drawImageTime > putImageDataTime) {\n this.imageBuffer = imageBuffer;\n this.copyGLTo2D = copyGLTo2DPutImageData;\n }\n else {\n this.copyGLTo2D = copyGLTo2DDrawImage;\n }\n },\n\n /**\n * Create a canvas element and associated WebGL context and attaches them as\n * class properties to the GLFilterBackend class.\n */\n createWebGLCanvas: function(width, height) {\n var canvas = fabric.util.createCanvasElement();\n canvas.width = width;\n canvas.height = height;\n var glOptions = {\n alpha: true,\n premultipliedAlpha: false,\n depth: false,\n stencil: false,\n antialias: false\n },\n gl = canvas.getContext('webgl', glOptions);\n if (!gl) {\n gl = canvas.getContext('experimental-webgl', glOptions);\n }\n if (!gl) {\n return;\n }\n gl.clearColor(0, 0, 0, 0);\n // this canvas can fire webglcontextlost and webglcontextrestored\n this.canvas = canvas;\n this.gl = gl;\n },\n\n /**\n * Attempts to apply the requested filters to the source provided, drawing the filtered output\n * to the provided target canvas.\n *\n * @param {Array} filters The filters to apply.\n * @param {HTMLImageElement|HTMLCanvasElement} source The source to be filtered.\n * @param {Number} width The width of the source input.\n * @param {Number} height The height of the source input.\n * @param {HTMLCanvasElement} targetCanvas The destination for filtered output to be drawn.\n * @param {String|undefined} cacheKey A key used to cache resources related to the source. If\n * omitted, caching will be skipped.\n */\n applyFilters: function(filters, source, width, height, targetCanvas, cacheKey) {\n var gl = this.gl;\n var cachedTexture;\n if (cacheKey) {\n cachedTexture = this.getCachedTexture(cacheKey, source);\n }\n var pipelineState = {\n originalWidth: source.width || source.originalWidth,\n originalHeight: source.height || source.originalHeight,\n sourceWidth: width,\n sourceHeight: height,\n destinationWidth: width,\n destinationHeight: height,\n context: gl,\n sourceTexture: this.createTexture(gl, width, height, !cachedTexture && source),\n targetTexture: this.createTexture(gl, width, height),\n originalTexture: cachedTexture ||\n this.createTexture(gl, width, height, !cachedTexture && source),\n passes: filters.length,\n webgl: true,\n aPosition: this.aPosition,\n programCache: this.programCache,\n pass: 0,\n filterBackend: this,\n targetCanvas: targetCanvas\n };\n var tempFbo = gl.createFramebuffer();\n gl.bindFramebuffer(gl.FRAMEBUFFER, tempFbo);\n filters.forEach(function(filter) { filter && filter.applyTo(pipelineState); });\n resizeCanvasIfNeeded(pipelineState);\n this.copyGLTo2D(gl, pipelineState);\n gl.bindTexture(gl.TEXTURE_2D, null);\n gl.deleteTexture(pipelineState.sourceTexture);\n gl.deleteTexture(pipelineState.targetTexture);\n gl.deleteFramebuffer(tempFbo);\n targetCanvas.getContext('2d').setTransform(1, 0, 0, 1, 0, 0);\n return pipelineState;\n },\n\n /**\n * Detach event listeners, remove references, and clean up caches.\n */\n dispose: function() {\n if (this.canvas) {\n this.canvas = null;\n this.gl = null;\n }\n this.clearWebGLCaches();\n },\n\n /**\n * Wipe out WebGL-related caches.\n */\n clearWebGLCaches: function() {\n this.programCache = {};\n this.textureCache = {};\n },\n\n /**\n * Create a WebGL texture object.\n *\n * Accepts specific dimensions to initialize the textuer to or a source image.\n *\n * @param {WebGLRenderingContext} gl The GL context to use for creating the texture.\n * @param {Number} width The width to initialize the texture at.\n * @param {Number} height The height to initialize the texture.\n * @param {HTMLImageElement|HTMLCanvasElement} textureImageSource A source for the texture data.\n * @returns {WebGLTexture}\n */\n createTexture: function(gl, width, height, textureImageSource) {\n var texture = gl.createTexture();\n gl.bindTexture(gl.TEXTURE_2D, texture);\n gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST);\n gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST);\n gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);\n gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);\n if (textureImageSource) {\n gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.RGBA, gl.UNSIGNED_BYTE, textureImageSource);\n }\n else {\n gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, null);\n }\n return texture;\n },\n\n /**\n * Can be optionally used to get a texture from the cache array\n *\n * If an existing texture is not found, a new texture is created and cached.\n *\n * @param {String} uniqueId A cache key to use to find an existing texture.\n * @param {HTMLImageElement|HTMLCanvasElement} textureImageSource A source to use to create the\n * texture cache entry if one does not already exist.\n */\n getCachedTexture: function(uniqueId, textureImageSource) {\n if (this.textureCache[uniqueId]) {\n return this.textureCache[uniqueId];\n }\n else {\n var texture = this.createTexture(\n this.gl, textureImageSource.width, textureImageSource.height, textureImageSource);\n this.textureCache[uniqueId] = texture;\n return texture;\n }\n },\n\n /**\n * Clear out cached resources related to a source image that has been\n * filtered previously.\n *\n * @param {String} cacheKey The cache key provided when the source image was filtered.\n */\n evictCachesForKey: function(cacheKey) {\n if (this.textureCache[cacheKey]) {\n this.gl.deleteTexture(this.textureCache[cacheKey]);\n delete this.textureCache[cacheKey];\n }\n },\n\n copyGLTo2D: copyGLTo2DDrawImage,\n\n /**\n * Attempt to extract GPU information strings from a WebGL context.\n *\n * Useful information when debugging or blacklisting specific GPUs.\n *\n * @returns {Object} A GPU info object with renderer and vendor strings.\n */\n captureGPUInfo: function() {\n if (this.gpuInfo) {\n return this.gpuInfo;\n }\n var gl = this.gl, gpuInfo = { renderer: '', vendor: '' };\n if (!gl) {\n return gpuInfo;\n }\n var ext = gl.getExtension('WEBGL_debug_renderer_info');\n if (ext) {\n var renderer = gl.getParameter(ext.UNMASKED_RENDERER_WEBGL);\n var vendor = gl.getParameter(ext.UNMASKED_VENDOR_WEBGL);\n if (renderer) {\n gpuInfo.renderer = renderer.toLowerCase();\n }\n if (vendor) {\n gpuInfo.vendor = vendor.toLowerCase();\n }\n }\n this.gpuInfo = gpuInfo;\n return gpuInfo;\n },\n };\n})();\n\nfunction resizeCanvasIfNeeded(pipelineState) {\n var targetCanvas = pipelineState.targetCanvas,\n width = targetCanvas.width, height = targetCanvas.height,\n dWidth = pipelineState.destinationWidth,\n dHeight = pipelineState.destinationHeight;\n\n if (width !== dWidth || height !== dHeight) {\n targetCanvas.width = dWidth;\n targetCanvas.height = dHeight;\n }\n}\n\n/**\n * Copy an input WebGL canvas on to an output 2D canvas.\n *\n * The WebGL canvas is assumed to be upside down, with the top-left pixel of the\n * desired output image appearing in the bottom-left corner of the WebGL canvas.\n *\n * @param {WebGLRenderingContext} sourceContext The WebGL context to copy from.\n * @param {HTMLCanvasElement} targetCanvas The 2D target canvas to copy on to.\n * @param {Object} pipelineState The 2D target canvas to copy on to.\n */\nfunction copyGLTo2DDrawImage(gl, pipelineState) {\n var glCanvas = gl.canvas, targetCanvas = pipelineState.targetCanvas,\n ctx = targetCanvas.getContext('2d');\n ctx.translate(0, targetCanvas.height); // move it down again\n ctx.scale(1, -1); // vertical flip\n // where is my image on the big glcanvas?\n var sourceY = glCanvas.height - targetCanvas.height;\n ctx.drawImage(glCanvas, 0, sourceY, targetCanvas.width, targetCanvas.height, 0, 0,\n targetCanvas.width, targetCanvas.height);\n}\n\n/**\n * Copy an input WebGL canvas on to an output 2D canvas using 2d canvas' putImageData\n * API. Measurably faster than using ctx.drawImage in Firefox (version 54 on OSX Sierra).\n *\n * @param {WebGLRenderingContext} sourceContext The WebGL context to copy from.\n * @param {HTMLCanvasElement} targetCanvas The 2D target canvas to copy on to.\n * @param {Object} pipelineState The 2D target canvas to copy on to.\n */\nfunction copyGLTo2DPutImageData(gl, pipelineState) {\n var targetCanvas = pipelineState.targetCanvas, ctx = targetCanvas.getContext('2d'),\n dWidth = pipelineState.destinationWidth,\n dHeight = pipelineState.destinationHeight,\n numBytes = dWidth * dHeight * 4;\n\n // eslint-disable-next-line no-undef\n var u8 = new Uint8Array(this.imageBuffer, 0, numBytes);\n // eslint-disable-next-line no-undef\n var u8Clamped = new Uint8ClampedArray(this.imageBuffer, 0, numBytes);\n\n gl.readPixels(0, 0, dWidth, dHeight, gl.RGBA, gl.UNSIGNED_BYTE, u8);\n var imgData = new ImageData(u8Clamped, dWidth, dHeight);\n ctx.putImageData(imgData, 0, 0);\n}\n\n\n(function() {\n\n 'use strict';\n\n var noop = function() {};\n\n fabric.Canvas2dFilterBackend = Canvas2dFilterBackend;\n\n /**\n * Canvas 2D filter backend.\n */\n function Canvas2dFilterBackend() {};\n\n Canvas2dFilterBackend.prototype = /** @lends fabric.Canvas2dFilterBackend.prototype */ {\n evictCachesForKey: noop,\n dispose: noop,\n clearWebGLCaches: noop,\n\n /**\n * Experimental. This object is a sort of repository of help layers used to avoid\n * of recreating them during frequent filtering. If you are previewing a filter with\n * a slider you probably do not want to create help layers every filter step.\n * in this object there will be appended some canvases, created once, resized sometimes\n * cleared never. Clearing is left to the developer.\n **/\n resources: {\n\n },\n\n /**\n * Apply a set of filters against a source image and draw the filtered output\n * to the provided destination canvas.\n *\n * @param {EnhancedFilter} filters The filter to apply.\n * @param {HTMLImageElement|HTMLCanvasElement} sourceElement The source to be filtered.\n * @param {Number} sourceWidth The width of the source input.\n * @param {Number} sourceHeight The height of the source input.\n * @param {HTMLCanvasElement} targetCanvas The destination for filtered output to be drawn.\n */\n applyFilters: function(filters, sourceElement, sourceWidth, sourceHeight, targetCanvas) {\n var ctx = targetCanvas.getContext('2d');\n ctx.drawImage(sourceElement, 0, 0, sourceWidth, sourceHeight);\n var imageData = ctx.getImageData(0, 0, sourceWidth, sourceHeight);\n var originalImageData = ctx.getImageData(0, 0, sourceWidth, sourceHeight);\n var pipelineState = {\n sourceWidth: sourceWidth,\n sourceHeight: sourceHeight,\n imageData: imageData,\n originalEl: sourceElement,\n originalImageData: originalImageData,\n canvasEl: targetCanvas,\n ctx: ctx,\n filterBackend: this,\n };\n filters.forEach(function(filter) { filter.applyTo(pipelineState); });\n if (pipelineState.imageData.width !== sourceWidth || pipelineState.imageData.height !== sourceHeight) {\n targetCanvas.width = pipelineState.imageData.width;\n targetCanvas.height = pipelineState.imageData.height;\n }\n ctx.putImageData(pipelineState.imageData, 0, 0);\n return pipelineState;\n },\n\n };\n})();\n\n\n/**\n * @namespace fabric.Image.filters\n * @memberOf fabric.Image\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-2#image_filters}\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n */\nfabric.Image = fabric.Image || { };\nfabric.Image.filters = fabric.Image.filters || { };\n\n/**\n * Root filter class from which all filter classes inherit from\n * @class fabric.Image.filters.BaseFilter\n * @memberOf fabric.Image.filters\n */\nfabric.Image.filters.BaseFilter = fabric.util.createClass(/** @lends fabric.Image.filters.BaseFilter.prototype */ {\n\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'BaseFilter',\n\n /**\n * Array of attributes to send with buffers. do not modify\n * @private\n */\n\n vertexSource: 'attribute vec2 aPosition;\\n' +\n 'varying vec2 vTexCoord;\\n' +\n 'void main() {\\n' +\n 'vTexCoord = aPosition;\\n' +\n 'gl_Position = vec4(aPosition * 2.0 - 1.0, 0.0, 1.0);\\n' +\n '}',\n\n fragmentSource: 'precision highp float;\\n' +\n 'varying vec2 vTexCoord;\\n' +\n 'uniform sampler2D uTexture;\\n' +\n 'void main() {\\n' +\n 'gl_FragColor = texture2D(uTexture, vTexCoord);\\n' +\n '}',\n\n /**\n * Constructor\n * @param {Object} [options] Options object\n */\n initialize: function(options) {\n if (options) {\n this.setOptions(options);\n }\n },\n\n /**\n * Sets filter's properties from options\n * @param {Object} [options] Options object\n */\n setOptions: function(options) {\n for (var prop in options) {\n this[prop] = options[prop];\n }\n },\n\n /**\n * Compile this filter's shader program.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context to use for shader compilation.\n * @param {String} fragmentSource fragmentShader source for compilation\n * @param {String} vertexSource vertexShader source for compilation\n */\n createProgram: function(gl, fragmentSource, vertexSource) {\n fragmentSource = fragmentSource || this.fragmentSource;\n vertexSource = vertexSource || this.vertexSource;\n if (fabric.webGlPrecision !== 'highp'){\n fragmentSource = fragmentSource.replace(\n /precision highp float/g,\n 'precision ' + fabric.webGlPrecision + ' float'\n );\n }\n var vertexShader = gl.createShader(gl.VERTEX_SHADER);\n gl.shaderSource(vertexShader, vertexSource);\n gl.compileShader(vertexShader);\n if (!gl.getShaderParameter(vertexShader, gl.COMPILE_STATUS)) {\n throw new Error(\n // eslint-disable-next-line prefer-template\n 'Vertex shader compile error for ' + this.type + ': ' +\n gl.getShaderInfoLog(vertexShader)\n );\n }\n\n var fragmentShader = gl.createShader(gl.FRAGMENT_SHADER);\n gl.shaderSource(fragmentShader, fragmentSource);\n gl.compileShader(fragmentShader);\n if (!gl.getShaderParameter(fragmentShader, gl.COMPILE_STATUS)) {\n throw new Error(\n // eslint-disable-next-line prefer-template\n 'Fragment shader compile error for ' + this.type + ': ' +\n gl.getShaderInfoLog(fragmentShader)\n );\n }\n\n var program = gl.createProgram();\n gl.attachShader(program, vertexShader);\n gl.attachShader(program, fragmentShader);\n gl.linkProgram(program);\n if (!gl.getProgramParameter(program, gl.LINK_STATUS)) {\n throw new Error(\n // eslint-disable-next-line prefer-template\n 'Shader link error for \"${this.type}\" ' +\n gl.getProgramInfoLog(program)\n );\n }\n\n var attributeLocations = this.getAttributeLocations(gl, program);\n var uniformLocations = this.getUniformLocations(gl, program) || { };\n uniformLocations.uStepW = gl.getUniformLocation(program, 'uStepW');\n uniformLocations.uStepH = gl.getUniformLocation(program, 'uStepH');\n return {\n program: program,\n attributeLocations: attributeLocations,\n uniformLocations: uniformLocations\n };\n },\n\n /**\n * Return a map of attribute names to WebGLAttributeLocation objects.\n *\n * @param {WebGLRenderingContext} gl The canvas context used to compile the shader program.\n * @param {WebGLShaderProgram} program The shader program from which to take attribute locations.\n * @returns {Object} A map of attribute names to attribute locations.\n */\n getAttributeLocations: function(gl, program) {\n return {\n aPosition: gl.getAttribLocation(program, 'aPosition'),\n };\n },\n\n /**\n * Return a map of uniform names to WebGLUniformLocation objects.\n *\n * Intended to be overridden by subclasses.\n *\n * @param {WebGLRenderingContext} gl The canvas context used to compile the shader program.\n * @param {WebGLShaderProgram} program The shader program from which to take uniform locations.\n * @returns {Object} A map of uniform names to uniform locations.\n */\n getUniformLocations: function (/* gl, program */) {\n // in case i do not need any special uniform i need to return an empty object\n return { };\n },\n\n /**\n * Send attribute data from this filter to its shader program on the GPU.\n *\n * @param {WebGLRenderingContext} gl The canvas context used to compile the shader program.\n * @param {Object} attributeLocations A map of shader attribute names to their locations.\n */\n sendAttributeData: function(gl, attributeLocations, aPositionData) {\n var attributeLocation = attributeLocations.aPosition;\n var buffer = gl.createBuffer();\n gl.bindBuffer(gl.ARRAY_BUFFER, buffer);\n gl.enableVertexAttribArray(attributeLocation);\n gl.vertexAttribPointer(attributeLocation, 2, gl.FLOAT, false, 0, 0);\n gl.bufferData(gl.ARRAY_BUFFER, aPositionData, gl.STATIC_DRAW);\n },\n\n _setupFrameBuffer: function(options) {\n var gl = options.context, width, height;\n if (options.passes > 1) {\n width = options.destinationWidth;\n height = options.destinationHeight;\n if (options.sourceWidth !== width || options.sourceHeight !== height) {\n gl.deleteTexture(options.targetTexture);\n options.targetTexture = options.filterBackend.createTexture(gl, width, height);\n }\n gl.framebufferTexture2D(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.TEXTURE_2D,\n options.targetTexture, 0);\n }\n else {\n // draw last filter on canvas and not to framebuffer.\n gl.bindFramebuffer(gl.FRAMEBUFFER, null);\n gl.finish();\n }\n },\n\n _swapTextures: function(options) {\n options.passes--;\n options.pass++;\n var temp = options.targetTexture;\n options.targetTexture = options.sourceTexture;\n options.sourceTexture = temp;\n },\n\n /**\n * Generic isNeutral implementation for one parameter based filters.\n * Used only in image applyFilters to discard filters that will not have an effect\n * on the image\n * Other filters may need their own verison ( ColorMatrix, HueRotation, gamma, ComposedFilter )\n * @param {Object} options\n **/\n isNeutralState: function(/* options */) {\n var main = this.mainParameter,\n _class = fabric.Image.filters[this.type].prototype;\n if (main) {\n if (Array.isArray(_class[main])) {\n for (var i = _class[main].length; i--;) {\n if (this[main][i] !== _class[main][i]) {\n return false;\n }\n }\n return true;\n }\n else {\n return _class[main] === this[main];\n }\n }\n else {\n return false;\n }\n },\n\n /**\n * Apply this filter to the input image data provided.\n *\n * Determines whether to use WebGL or Canvas2D based on the options.webgl flag.\n *\n * @param {Object} options\n * @param {Number} options.passes The number of filters remaining to be executed\n * @param {Boolean} options.webgl Whether to use webgl to render the filter.\n * @param {WebGLTexture} options.sourceTexture The texture setup as the source to be filtered.\n * @param {WebGLTexture} options.targetTexture The texture where filtered output should be drawn.\n * @param {WebGLRenderingContext} options.context The GL context used for rendering.\n * @param {Object} options.programCache A map of compiled shader programs, keyed by filter type.\n */\n applyTo: function(options) {\n if (options.webgl) {\n this._setupFrameBuffer(options);\n this.applyToWebGL(options);\n this._swapTextures(options);\n }\n else {\n this.applyTo2d(options);\n }\n },\n\n /**\n * Retrieves the cached shader.\n * @param {Object} options\n * @param {WebGLRenderingContext} options.context The GL context used for rendering.\n * @param {Object} options.programCache A map of compiled shader programs, keyed by filter type.\n */\n retrieveShader: function(options) {\n if (!options.programCache.hasOwnProperty(this.type)) {\n options.programCache[this.type] = this.createProgram(options.context);\n }\n return options.programCache[this.type];\n },\n\n /**\n * Apply this filter using webgl.\n *\n * @param {Object} options\n * @param {Number} options.passes The number of filters remaining to be executed\n * @param {Boolean} options.webgl Whether to use webgl to render the filter.\n * @param {WebGLTexture} options.originalTexture The texture of the original input image.\n * @param {WebGLTexture} options.sourceTexture The texture setup as the source to be filtered.\n * @param {WebGLTexture} options.targetTexture The texture where filtered output should be drawn.\n * @param {WebGLRenderingContext} options.context The GL context used for rendering.\n * @param {Object} options.programCache A map of compiled shader programs, keyed by filter type.\n */\n applyToWebGL: function(options) {\n var gl = options.context;\n var shader = this.retrieveShader(options);\n if (options.pass === 0 && options.originalTexture) {\n gl.bindTexture(gl.TEXTURE_2D, options.originalTexture);\n }\n else {\n gl.bindTexture(gl.TEXTURE_2D, options.sourceTexture);\n }\n gl.useProgram(shader.program);\n this.sendAttributeData(gl, shader.attributeLocations, options.aPosition);\n\n gl.uniform1f(shader.uniformLocations.uStepW, 1 / options.sourceWidth);\n gl.uniform1f(shader.uniformLocations.uStepH, 1 / options.sourceHeight);\n\n this.sendUniformData(gl, shader.uniformLocations);\n gl.viewport(0, 0, options.destinationWidth, options.destinationHeight);\n gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);\n },\n\n bindAdditionalTexture: function(gl, texture, textureUnit) {\n gl.activeTexture(textureUnit);\n gl.bindTexture(gl.TEXTURE_2D, texture);\n // reset active texture to 0 as usual\n gl.activeTexture(gl.TEXTURE0);\n },\n\n unbindAdditionalTexture: function(gl, textureUnit) {\n gl.activeTexture(textureUnit);\n gl.bindTexture(gl.TEXTURE_2D, null);\n gl.activeTexture(gl.TEXTURE0);\n },\n\n getMainParameter: function() {\n return this[this.mainParameter];\n },\n\n setMainParameter: function(value) {\n this[this.mainParameter] = value;\n },\n\n /**\n * Send uniform data from this filter to its shader program on the GPU.\n *\n * Intended to be overridden by subclasses.\n *\n * @param {WebGLRenderingContext} gl The canvas context used to compile the shader program.\n * @param {Object} uniformLocations A map of shader uniform names to their locations.\n */\n sendUniformData: function(/* gl, uniformLocations */) {\n // Intentionally left blank. Override me in subclasses.\n },\n\n /**\n * If needed by a 2d filter, this functions can create an helper canvas to be used\n * remember that options.targetCanvas is available for use till end of chain.\n */\n createHelpLayer: function(options) {\n if (!options.helpLayer) {\n var helpLayer = document.createElement('canvas');\n helpLayer.width = options.sourceWidth;\n helpLayer.height = options.sourceHeight;\n options.helpLayer = helpLayer;\n }\n },\n\n /**\n * Returns object representation of an instance\n * @return {Object} Object representation of an instance\n */\n toObject: function() {\n var object = { type: this.type }, mainP = this.mainParameter;\n if (mainP) {\n object[mainP] = this[mainP];\n }\n return object;\n },\n\n /**\n * Returns a JSON representation of an instance\n * @return {Object} JSON\n */\n toJSON: function() {\n // delegate, not alias\n return this.toObject();\n }\n});\n\nfabric.Image.filters.BaseFilter.fromObject = function(object, callback) {\n var filter = new fabric.Image.filters[object.type](object);\n callback && callback(filter);\n return filter;\n};\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }),\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n\n /**\n * Color Matrix filter class\n * @class fabric.Image.filters.ColorMatrix\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link fabric.Image.filters.ColorMatrix#initialize} for constructor definition\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @see {@Link http://www.webwasp.co.uk/tutorials/219/Color_Matrix_Filter.php}\n * @see {@Link http://phoboslab.org/log/2013/11/fast-image-filters-with-webgl}\n * @example <caption>Kodachrome filter</caption>\n * var filter = new fabric.Image.filters.ColorMatrix({\n * matrix: [\n 1.1285582396593525, -0.3967382283601348, -0.03992559172921793, 0, 63.72958762196502,\n -0.16404339962244616, 1.0835251566291304, -0.05498805115633132, 0, 24.732407896706203,\n -0.16786010706155763, -0.5603416277695248, 1.6014850761964943, 0, 35.62982807460946,\n 0, 0, 0, 1, 0\n ]\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n */\n filters.ColorMatrix = createClass(filters.BaseFilter, /** @lends fabric.Image.filters.ColorMatrix.prototype */ {\n\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'ColorMatrix',\n\n fragmentSource: 'precision highp float;\\n' +\n 'uniform sampler2D uTexture;\\n' +\n 'varying vec2 vTexCoord;\\n' +\n 'uniform mat4 uColorMatrix;\\n' +\n 'uniform vec4 uConstants;\\n' +\n 'void main() {\\n' +\n 'vec4 color = texture2D(uTexture, vTexCoord);\\n' +\n 'color *= uColorMatrix;\\n' +\n 'color += uConstants;\\n' +\n 'gl_FragColor = color;\\n' +\n '}',\n\n /**\n * Colormatrix for pixels.\n * array of 20 floats. Numbers in positions 4, 9, 14, 19 loose meaning\n * outside the -1, 1 range.\n * 0.0039215686 is the part of 1 that get translated to 1 in 2d\n * @param {Array} matrix array of 20 numbers.\n * @default\n */\n matrix: [\n 1, 0, 0, 0, 0,\n 0, 1, 0, 0, 0,\n 0, 0, 1, 0, 0,\n 0, 0, 0, 1, 0\n ],\n\n mainParameter: 'matrix',\n\n /**\n * Lock the colormatrix on the color part, skipping alpha, manly for non webgl scenario\n * to save some calculation\n */\n colorsOnly: true,\n\n /**\n * Constructor\n * @param {Object} [options] Options object\n */\n initialize: function(options) {\n this.callSuper('initialize', options);\n // create a new array instead mutating the prototype with push\n this.matrix = this.matrix.slice(0);\n },\n\n /**\n * Apply the ColorMatrix operation to a Uint8Array representing the pixels of an image.\n *\n * @param {Object} options\n * @param {ImageData} options.imageData The Uint8Array to be filtered.\n */\n applyTo2d: function(options) {\n var imageData = options.imageData,\n data = imageData.data,\n iLen = data.length,\n m = this.matrix,\n r, g, b, a, i, colorsOnly = this.colorsOnly;\n\n for (i = 0; i < iLen; i += 4) {\n r = data[i];\n g = data[i + 1];\n b = data[i + 2];\n if (colorsOnly) {\n data[i] = r * m[0] + g * m[1] + b * m[2] + m[4] * 255;\n data[i + 1] = r * m[5] + g * m[6] + b * m[7] + m[9] * 255;\n data[i + 2] = r * m[10] + g * m[11] + b * m[12] + m[14] * 255;\n }\n else {\n a = data[i + 3];\n data[i] = r * m[0] + g * m[1] + b * m[2] + a * m[3] + m[4] * 255;\n data[i + 1] = r * m[5] + g * m[6] + b * m[7] + a * m[8] + m[9] * 255;\n data[i + 2] = r * m[10] + g * m[11] + b * m[12] + a * m[13] + m[14] * 255;\n data[i + 3] = r * m[15] + g * m[16] + b * m[17] + a * m[18] + m[19] * 255;\n }\n }\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function(gl, program) {\n return {\n uColorMatrix: gl.getUniformLocation(program, 'uColorMatrix'),\n uConstants: gl.getUniformLocation(program, 'uConstants'),\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function(gl, uniformLocations) {\n var m = this.matrix,\n matrix = [\n m[0], m[1], m[2], m[3],\n m[5], m[6], m[7], m[8],\n m[10], m[11], m[12], m[13],\n m[15], m[16], m[17], m[18]\n ],\n constants = [m[4], m[9], m[14], m[19]];\n gl.uniformMatrix4fv(uniformLocations.uColorMatrix, false, matrix);\n gl.uniform4fv(uniformLocations.uConstants, constants);\n },\n });\n\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] function to invoke after filter creation\n * @return {fabric.Image.filters.ColorMatrix} Instance of fabric.Image.filters.ColorMatrix\n */\n fabric.Image.filters.ColorMatrix.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }),\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n\n /**\n * Brightness filter class\n * @class fabric.Image.filters.Brightness\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link fabric.Image.filters.Brightness#initialize} for constructor definition\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @example\n * var filter = new fabric.Image.filters.Brightness({\n * brightness: 0.05\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n */\n filters.Brightness = createClass(filters.BaseFilter, /** @lends fabric.Image.filters.Brightness.prototype */ {\n\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'Brightness',\n\n /**\n * Fragment source for the brightness program\n */\n fragmentSource: 'precision highp float;\\n' +\n 'uniform sampler2D uTexture;\\n' +\n 'uniform float uBrightness;\\n' +\n 'varying vec2 vTexCoord;\\n' +\n 'void main() {\\n' +\n 'vec4 color = texture2D(uTexture, vTexCoord);\\n' +\n 'color.rgb += uBrightness;\\n' +\n 'gl_FragColor = color;\\n' +\n '}',\n\n /**\n * Brightness value, from -1 to 1.\n * translated to -255 to 255 for 2d\n * 0.0039215686 is the part of 1 that get translated to 1 in 2d\n * @param {Number} brightness\n * @default\n */\n brightness: 0,\n\n /**\n * Describe the property that is the filter parameter\n * @param {String} m\n * @default\n */\n mainParameter: 'brightness',\n\n /**\n * Apply the Brightness operation to a Uint8ClampedArray representing the pixels of an image.\n *\n * @param {Object} options\n * @param {ImageData} options.imageData The Uint8ClampedArray to be filtered.\n */\n applyTo2d: function(options) {\n if (this.brightness === 0) {\n return;\n }\n var imageData = options.imageData,\n data = imageData.data, i, len = data.length,\n brightness = Math.round(this.brightness * 255);\n for (i = 0; i < len; i += 4) {\n data[i] = data[i] + brightness;\n data[i + 1] = data[i + 1] + brightness;\n data[i + 2] = data[i + 2] + brightness;\n }\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function(gl, program) {\n return {\n uBrightness: gl.getUniformLocation(program, 'uBrightness'),\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function(gl, uniformLocations) {\n gl.uniform1f(uniformLocations.uBrightness, this.brightness);\n },\n });\n\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] to be invoked after filter creation\n * @return {fabric.Image.filters.Brightness} Instance of fabric.Image.filters.Brightness\n */\n fabric.Image.filters.Brightness.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }),\n extend = fabric.util.object.extend,\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n\n /**\n * Adapted from <a href=\"http://www.html5rocks.com/en/tutorials/canvas/imagefilters/\">html5rocks article</a>\n * @class fabric.Image.filters.Convolute\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link fabric.Image.filters.Convolute#initialize} for constructor definition\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @example <caption>Sharpen filter</caption>\n * var filter = new fabric.Image.filters.Convolute({\n * matrix: [ 0, -1, 0,\n * -1, 5, -1,\n * 0, -1, 0 ]\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n * canvas.renderAll();\n * @example <caption>Blur filter</caption>\n * var filter = new fabric.Image.filters.Convolute({\n * matrix: [ 1/9, 1/9, 1/9,\n * 1/9, 1/9, 1/9,\n * 1/9, 1/9, 1/9 ]\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n * canvas.renderAll();\n * @example <caption>Emboss filter</caption>\n * var filter = new fabric.Image.filters.Convolute({\n * matrix: [ 1, 1, 1,\n * 1, 0.7, -1,\n * -1, -1, -1 ]\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n * canvas.renderAll();\n * @example <caption>Emboss filter with opaqueness</caption>\n * var filter = new fabric.Image.filters.Convolute({\n * opaque: true,\n * matrix: [ 1, 1, 1,\n * 1, 0.7, -1,\n * -1, -1, -1 ]\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n * canvas.renderAll();\n */\n filters.Convolute = createClass(filters.BaseFilter, /** @lends fabric.Image.filters.Convolute.prototype */ {\n\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'Convolute',\n\n /*\n * Opaque value (true/false)\n */\n opaque: false,\n\n /*\n * matrix for the filter, max 9x9\n */\n matrix: [0, 0, 0, 0, 1, 0, 0, 0, 0],\n\n /**\n * Fragment source for the brightness program\n */\n fragmentSource: {\n Convolute_3_1: 'precision highp float;\\n' +\n 'uniform sampler2D uTexture;\\n' +\n 'uniform float uMatrix[9];\\n' +\n 'uniform float uStepW;\\n' +\n 'uniform float uStepH;\\n' +\n 'varying vec2 vTexCoord;\\n' +\n 'void main() {\\n' +\n 'vec4 color = vec4(0, 0, 0, 0);\\n' +\n 'for (float h = 0.0; h < 3.0; h+=1.0) {\\n' +\n 'for (float w = 0.0; w < 3.0; w+=1.0) {\\n' +\n 'vec2 matrixPos = vec2(uStepW * (w - 1), uStepH * (h - 1));\\n' +\n 'color += texture2D(uTexture, vTexCoord + matrixPos) * uMatrix[int(h * 3.0 + w)];\\n' +\n '}\\n' +\n '}\\n' +\n 'gl_FragColor = color;\\n' +\n '}',\n Convolute_3_0: 'precision highp float;\\n' +\n 'uniform sampler2D uTexture;\\n' +\n 'uniform float uMatrix[9];\\n' +\n 'uniform float uStepW;\\n' +\n 'uniform float uStepH;\\n' +\n 'varying vec2 vTexCoord;\\n' +\n 'void main() {\\n' +\n 'vec4 color = vec4(0, 0, 0, 1);\\n' +\n 'for (float h = 0.0; h < 3.0; h+=1.0) {\\n' +\n 'for (float w = 0.0; w < 3.0; w+=1.0) {\\n' +\n 'vec2 matrixPos = vec2(uStepW * (w - 1.0), uStepH * (h - 1.0));\\n' +\n 'color.rgb += texture2D(uTexture, vTexCoord + matrixPos).rgb * uMatrix[int(h * 3.0 + w)];\\n' +\n '}\\n' +\n '}\\n' +\n 'float alpha = texture2D(uTexture, vTexCoord).a;\\n' +\n 'gl_FragColor = color;\\n' +\n 'gl_FragColor.a = alpha;\\n' +\n '}',\n Convolute_5_1: 'precision highp float;\\n' +\n 'uniform sampler2D uTexture;\\n' +\n 'uniform float uMatrix[25];\\n' +\n 'uniform float uStepW;\\n' +\n 'uniform float uStepH;\\n' +\n 'varying vec2 vTexCoord;\\n' +\n 'void main() {\\n' +\n 'vec4 color = vec4(0, 0, 0, 0);\\n' +\n 'for (float h = 0.0; h < 5.0; h+=1.0) {\\n' +\n 'for (float w = 0.0; w < 5.0; w+=1.0) {\\n' +\n 'vec2 matrixPos = vec2(uStepW * (w - 2.0), uStepH * (h - 2.0));\\n' +\n 'color += texture2D(uTexture, vTexCoord + matrixPos) * uMatrix[int(h * 5.0 + w)];\\n' +\n '}\\n' +\n '}\\n' +\n 'gl_FragColor = color;\\n' +\n '}',\n Convolute_5_0: 'precision highp float;\\n' +\n 'uniform sampler2D uTexture;\\n' +\n 'uniform float uMatrix[25];\\n' +\n 'uniform float uStepW;\\n' +\n 'uniform float uStepH;\\n' +\n 'varying vec2 vTexCoord;\\n' +\n 'void main() {\\n' +\n 'vec4 color = vec4(0, 0, 0, 1);\\n' +\n 'for (float h = 0.0; h < 5.0; h+=1.0) {\\n' +\n 'for (float w = 0.0; w < 5.0; w+=1.0) {\\n' +\n 'vec2 matrixPos = vec2(uStepW * (w - 2.0), uStepH * (h - 2.0));\\n' +\n 'color.rgb += texture2D(uTexture, vTexCoord + matrixPos).rgb * uMatrix[int(h * 5.0 + w)];\\n' +\n '}\\n' +\n '}\\n' +\n 'float alpha = texture2D(uTexture, vTexCoord).a;\\n' +\n 'gl_FragColor = color;\\n' +\n 'gl_FragColor.a = alpha;\\n' +\n '}',\n Convolute_7_1: 'precision highp float;\\n' +\n 'uniform sampler2D uTexture;\\n' +\n 'uniform float uMatrix[49];\\n' +\n 'uniform float uStepW;\\n' +\n 'uniform float uStepH;\\n' +\n 'varying vec2 vTexCoord;\\n' +\n 'void main() {\\n' +\n 'vec4 color = vec4(0, 0, 0, 0);\\n' +\n 'for (float h = 0.0; h < 7.0; h+=1.0) {\\n' +\n 'for (float w = 0.0; w < 7.0; w+=1.0) {\\n' +\n 'vec2 matrixPos = vec2(uStepW * (w - 3.0), uStepH * (h - 3.0));\\n' +\n 'color += texture2D(uTexture, vTexCoord + matrixPos) * uMatrix[int(h * 7.0 + w)];\\n' +\n '}\\n' +\n '}\\n' +\n 'gl_FragColor = color;\\n' +\n '}',\n Convolute_7_0: 'precision highp float;\\n' +\n 'uniform sampler2D uTexture;\\n' +\n 'uniform float uMatrix[49];\\n' +\n 'uniform float uStepW;\\n' +\n 'uniform float uStepH;\\n' +\n 'varying vec2 vTexCoord;\\n' +\n 'void main() {\\n' +\n 'vec4 color = vec4(0, 0, 0, 1);\\n' +\n 'for (float h = 0.0; h < 7.0; h+=1.0) {\\n' +\n 'for (float w = 0.0; w < 7.0; w+=1.0) {\\n' +\n 'vec2 matrixPos = vec2(uStepW * (w - 3.0), uStepH * (h - 3.0));\\n' +\n 'color.rgb += texture2D(uTexture, vTexCoord + matrixPos).rgb * uMatrix[int(h * 7.0 + w)];\\n' +\n '}\\n' +\n '}\\n' +\n 'float alpha = texture2D(uTexture, vTexCoord).a;\\n' +\n 'gl_FragColor = color;\\n' +\n 'gl_FragColor.a = alpha;\\n' +\n '}',\n Convolute_9_1: 'precision highp float;\\n' +\n 'uniform sampler2D uTexture;\\n' +\n 'uniform float uMatrix[81];\\n' +\n 'uniform float uStepW;\\n' +\n 'uniform float uStepH;\\n' +\n 'varying vec2 vTexCoord;\\n' +\n 'void main() {\\n' +\n 'vec4 color = vec4(0, 0, 0, 0);\\n' +\n 'for (float h = 0.0; h < 9.0; h+=1.0) {\\n' +\n 'for (float w = 0.0; w < 9.0; w+=1.0) {\\n' +\n 'vec2 matrixPos = vec2(uStepW * (w - 4.0), uStepH * (h - 4.0));\\n' +\n 'color += texture2D(uTexture, vTexCoord + matrixPos) * uMatrix[int(h * 9.0 + w)];\\n' +\n '}\\n' +\n '}\\n' +\n 'gl_FragColor = color;\\n' +\n '}',\n Convolute_9_0: 'precision highp float;\\n' +\n 'uniform sampler2D uTexture;\\n' +\n 'uniform float uMatrix[81];\\n' +\n 'uniform float uStepW;\\n' +\n 'uniform float uStepH;\\n' +\n 'varying vec2 vTexCoord;\\n' +\n 'void main() {\\n' +\n 'vec4 color = vec4(0, 0, 0, 1);\\n' +\n 'for (float h = 0.0; h < 9.0; h+=1.0) {\\n' +\n 'for (float w = 0.0; w < 9.0; w+=1.0) {\\n' +\n 'vec2 matrixPos = vec2(uStepW * (w - 4.0), uStepH * (h - 4.0));\\n' +\n 'color.rgb += texture2D(uTexture, vTexCoord + matrixPos).rgb * uMatrix[int(h * 9.0 + w)];\\n' +\n '}\\n' +\n '}\\n' +\n 'float alpha = texture2D(uTexture, vTexCoord).a;\\n' +\n 'gl_FragColor = color;\\n' +\n 'gl_FragColor.a = alpha;\\n' +\n '}',\n },\n\n /**\n * Constructor\n * @memberOf fabric.Image.filters.Convolute.prototype\n * @param {Object} [options] Options object\n * @param {Boolean} [options.opaque=false] Opaque value (true/false)\n * @param {Array} [options.matrix] Filter matrix\n */\n\n\n /**\n * Retrieves the cached shader.\n * @param {Object} options\n * @param {WebGLRenderingContext} options.context The GL context used for rendering.\n * @param {Object} options.programCache A map of compiled shader programs, keyed by filter type.\n */\n retrieveShader: function(options) {\n var size = Math.sqrt(this.matrix.length);\n var cacheKey = this.type + '_' + size + '_' + (this.opaque ? 1 : 0);\n var shaderSource = this.fragmentSource[cacheKey];\n if (!options.programCache.hasOwnProperty(cacheKey)) {\n options.programCache[cacheKey] = this.createProgram(options.context, shaderSource);\n }\n return options.programCache[cacheKey];\n },\n\n /**\n * Apply the Brightness operation to a Uint8ClampedArray representing the pixels of an image.\n *\n * @param {Object} options\n * @param {ImageData} options.imageData The Uint8ClampedArray to be filtered.\n */\n applyTo2d: function(options) {\n var imageData = options.imageData,\n data = imageData.data,\n weights = this.matrix,\n side = Math.round(Math.sqrt(weights.length)),\n halfSide = Math.floor(side / 2),\n sw = imageData.width,\n sh = imageData.height,\n output = options.ctx.createImageData(sw, sh),\n dst = output.data,\n // go through the destination image pixels\n alphaFac = this.opaque ? 1 : 0,\n r, g, b, a, dstOff,\n scx, scy, srcOff, wt,\n x, y, cx, cy;\n\n for (y = 0; y < sh; y++) {\n for (x = 0; x < sw; x++) {\n dstOff = (y * sw + x) * 4;\n // calculate the weighed sum of the source image pixels that\n // fall under the convolution matrix\n r = 0; g = 0; b = 0; a = 0;\n\n for (cy = 0; cy < side; cy++) {\n for (cx = 0; cx < side; cx++) {\n scy = y + cy - halfSide;\n scx = x + cx - halfSide;\n\n // eslint-disable-next-line max-depth\n if (scy < 0 || scy >= sh || scx < 0 || scx >= sw) {\n continue;\n }\n\n srcOff = (scy * sw + scx) * 4;\n wt = weights[cy * side + cx];\n\n r += data[srcOff] * wt;\n g += data[srcOff + 1] * wt;\n b += data[srcOff + 2] * wt;\n // eslint-disable-next-line max-depth\n if (!alphaFac) {\n a += data[srcOff + 3] * wt;\n }\n }\n }\n dst[dstOff] = r;\n dst[dstOff + 1] = g;\n dst[dstOff + 2] = b;\n if (!alphaFac) {\n dst[dstOff + 3] = a;\n }\n else {\n dst[dstOff + 3] = data[dstOff + 3];\n }\n }\n }\n options.imageData = output;\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function(gl, program) {\n return {\n uMatrix: gl.getUniformLocation(program, 'uMatrix'),\n uOpaque: gl.getUniformLocation(program, 'uOpaque'),\n uHalfSize: gl.getUniformLocation(program, 'uHalfSize'),\n uSize: gl.getUniformLocation(program, 'uSize'),\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function(gl, uniformLocations) {\n gl.uniform1fv(uniformLocations.uMatrix, this.matrix);\n },\n\n /**\n * Returns object representation of an instance\n * @return {Object} Object representation of an instance\n */\n toObject: function() {\n return extend(this.callSuper('toObject'), {\n opaque: this.opaque,\n matrix: this.matrix\n });\n }\n });\n\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] to be invoked after filter creation\n * @return {fabric.Image.filters.Convolute} Instance of fabric.Image.filters.Convolute\n */\n fabric.Image.filters.Convolute.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }),\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n\n /**\n * Grayscale image filter class\n * @class fabric.Image.filters.Grayscale\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @example\n * var filter = new fabric.Image.filters.Grayscale();\n * object.filters.push(filter);\n * object.applyFilters();\n */\n filters.Grayscale = createClass(filters.BaseFilter, /** @lends fabric.Image.filters.Grayscale.prototype */ {\n\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'Grayscale',\n\n fragmentSource: {\n average: 'precision highp float;\\n' +\n 'uniform sampler2D uTexture;\\n' +\n 'varying vec2 vTexCoord;\\n' +\n 'void main() {\\n' +\n 'vec4 color = texture2D(uTexture, vTexCoord);\\n' +\n 'float average = (color.r + color.b + color.g) / 3.0;\\n' +\n 'gl_FragColor = vec4(average, average, average, color.a);\\n' +\n '}',\n lightness: 'precision highp float;\\n' +\n 'uniform sampler2D uTexture;\\n' +\n 'uniform int uMode;\\n' +\n 'varying vec2 vTexCoord;\\n' +\n 'void main() {\\n' +\n 'vec4 col = texture2D(uTexture, vTexCoord);\\n' +\n 'float average = (max(max(col.r, col.g),col.b) + min(min(col.r, col.g),col.b)) / 2.0;\\n' +\n 'gl_FragColor = vec4(average, average, average, col.a);\\n' +\n '}',\n luminosity: 'precision highp float;\\n' +\n 'uniform sampler2D uTexture;\\n' +\n 'uniform int uMode;\\n' +\n 'varying vec2 vTexCoord;\\n' +\n 'void main() {\\n' +\n 'vec4 col = texture2D(uTexture, vTexCoord);\\n' +\n 'float average = 0.21 * col.r + 0.72 * col.g + 0.07 * col.b;\\n' +\n 'gl_FragColor = vec4(average, average, average, col.a);\\n' +\n '}',\n },\n\n\n /**\n * Grayscale mode, between 'average', 'lightness', 'luminosity'\n * @param {String} type\n * @default\n */\n mode: 'average',\n\n mainParameter: 'mode',\n\n /**\n * Apply the Grayscale operation to a Uint8Array representing the pixels of an image.\n *\n * @param {Object} options\n * @param {ImageData} options.imageData The Uint8Array to be filtered.\n */\n applyTo2d: function(options) {\n var imageData = options.imageData,\n data = imageData.data, i,\n len = data.length, value,\n mode = this.mode;\n for (i = 0; i < len; i += 4) {\n if (mode === 'average') {\n value = (data[i] + data[i + 1] + data[i + 2]) / 3;\n }\n else if (mode === 'lightness') {\n value = (Math.min(data[i], data[i + 1], data[i + 2]) +\n Math.max(data[i], data[i + 1], data[i + 2])) / 2;\n }\n else if (mode === 'luminosity') {\n value = 0.21 * data[i] + 0.72 * data[i + 1] + 0.07 * data[i + 2];\n }\n data[i] = value;\n data[i + 1] = value;\n data[i + 2] = value;\n }\n },\n\n /**\n * Retrieves the cached shader.\n * @param {Object} options\n * @param {WebGLRenderingContext} options.context The GL context used for rendering.\n * @param {Object} options.programCache A map of compiled shader programs, keyed by filter type.\n */\n retrieveShader: function(options) {\n var cacheKey = this.type + '_' + this.mode;\n if (!options.programCache.hasOwnProperty(cacheKey)) {\n var shaderSource = this.fragmentSource[this.mode];\n options.programCache[cacheKey] = this.createProgram(options.context, shaderSource);\n }\n return options.programCache[cacheKey];\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function(gl, program) {\n return {\n uMode: gl.getUniformLocation(program, 'uMode'),\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function(gl, uniformLocations) {\n // default average mode.\n var mode = 1;\n gl.uniform1i(uniformLocations.uMode, mode);\n },\n\n /**\n * Grayscale filter isNeutralState implementation\n * The filter is never neutral\n * on the image\n **/\n isNeutralState: function() {\n return false;\n },\n });\n\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] to be invoked after filter creation\n * @return {fabric.Image.filters.Grayscale} Instance of fabric.Image.filters.Grayscale\n */\n fabric.Image.filters.Grayscale.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }),\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n\n /**\n * Invert filter class\n * @class fabric.Image.filters.Invert\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @example\n * var filter = new fabric.Image.filters.Invert();\n * object.filters.push(filter);\n * object.applyFilters(canvas.renderAll.bind(canvas));\n */\n filters.Invert = createClass(filters.BaseFilter, /** @lends fabric.Image.filters.Invert.prototype */ {\n\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'Invert',\n\n fragmentSource: 'precision highp float;\\n' +\n 'uniform sampler2D uTexture;\\n' +\n 'uniform int uInvert;\\n' +\n 'varying vec2 vTexCoord;\\n' +\n 'void main() {\\n' +\n 'vec4 color = texture2D(uTexture, vTexCoord);\\n' +\n 'if (uInvert == 1) {\\n' +\n 'gl_FragColor = vec4(1.0 - color.r,1.0 -color.g,1.0 -color.b,color.a);\\n' +\n '} else {\\n' +\n 'gl_FragColor = color;\\n' +\n '}\\n' +\n '}',\n\n /**\n * Filter invert. if false, does nothing\n * @param {Boolean} invert\n * @default\n */\n invert: true,\n\n mainParameter: 'invert',\n\n /**\n * Apply the Invert operation to a Uint8Array representing the pixels of an image.\n *\n * @param {Object} options\n * @param {ImageData} options.imageData The Uint8Array to be filtered.\n */\n applyTo2d: function(options) {\n var imageData = options.imageData,\n data = imageData.data, i,\n len = data.length;\n for (i = 0; i < len; i += 4) {\n data[i] = 255 - data[i];\n data[i + 1] = 255 - data[i + 1];\n data[i + 2] = 255 - data[i + 2];\n }\n },\n\n /**\n * Invert filter isNeutralState implementation\n * Used only in image applyFilters to discard filters that will not have an effect\n * on the image\n * @param {Object} options\n **/\n isNeutralState: function() {\n return !this.invert;\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function(gl, program) {\n return {\n uInvert: gl.getUniformLocation(program, 'uInvert'),\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function(gl, uniformLocations) {\n gl.uniform1i(uniformLocations.uInvert, this.invert);\n },\n });\n\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] to be invoked after filter creation\n * @return {fabric.Image.filters.Invert} Instance of fabric.Image.filters.Invert\n */\n fabric.Image.filters.Invert.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }),\n extend = fabric.util.object.extend,\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n\n /**\n * Noise filter class\n * @class fabric.Image.filters.Noise\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link fabric.Image.filters.Noise#initialize} for constructor definition\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @example\n * var filter = new fabric.Image.filters.Noise({\n * noise: 700\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n * canvas.renderAll();\n */\n filters.Noise = createClass(filters.BaseFilter, /** @lends fabric.Image.filters.Noise.prototype */ {\n\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'Noise',\n\n /**\n * Fragment source for the noise program\n */\n fragmentSource: 'precision highp float;\\n' +\n 'uniform sampler2D uTexture;\\n' +\n 'uniform float uStepH;\\n' +\n 'uniform float uNoise;\\n' +\n 'uniform float uSeed;\\n' +\n 'varying vec2 vTexCoord;\\n' +\n 'float rand(vec2 co, float seed, float vScale) {\\n' +\n 'return fract(sin(dot(co.xy * vScale ,vec2(12.9898 , 78.233))) * 43758.5453 * (seed + 0.01) / 2.0);\\n' +\n '}\\n' +\n 'void main() {\\n' +\n 'vec4 color = texture2D(uTexture, vTexCoord);\\n' +\n 'color.rgb += (0.5 - rand(vTexCoord, uSeed, 0.1 / uStepH)) * uNoise;\\n' +\n 'gl_FragColor = color;\\n' +\n '}',\n\n /**\n * Describe the property that is the filter parameter\n * @param {String} m\n * @default\n */\n mainParameter: 'noise',\n\n /**\n * Noise value, from\n * @param {Number} noise\n * @default\n */\n noise: 0,\n\n /**\n * Apply the Brightness operation to a Uint8ClampedArray representing the pixels of an image.\n *\n * @param {Object} options\n * @param {ImageData} options.imageData The Uint8ClampedArray to be filtered.\n */\n applyTo2d: function(options) {\n if (this.noise === 0) {\n return;\n }\n var imageData = options.imageData,\n data = imageData.data, i, len = data.length,\n noise = this.noise, rand;\n\n for (i = 0, len = data.length; i < len; i += 4) {\n\n rand = (0.5 - Math.random()) * noise;\n\n data[i] += rand;\n data[i + 1] += rand;\n data[i + 2] += rand;\n }\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function(gl, program) {\n return {\n uNoise: gl.getUniformLocation(program, 'uNoise'),\n uSeed: gl.getUniformLocation(program, 'uSeed'),\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function(gl, uniformLocations) {\n gl.uniform1f(uniformLocations.uNoise, this.noise / 255);\n gl.uniform1f(uniformLocations.uSeed, Math.random());\n },\n\n /**\n * Returns object representation of an instance\n * @return {Object} Object representation of an instance\n */\n toObject: function() {\n return extend(this.callSuper('toObject'), {\n noise: this.noise\n });\n }\n });\n\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {Function} [callback] to be invoked after filter creation\n * @return {fabric.Image.filters.Noise} Instance of fabric.Image.filters.Noise\n */\n fabric.Image.filters.Noise.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }),\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n\n /**\n * Pixelate filter class\n * @class fabric.Image.filters.Pixelate\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link fabric.Image.filters.Pixelate#initialize} for constructor definition\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @example\n * var filter = new fabric.Image.filters.Pixelate({\n * blocksize: 8\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n */\n filters.Pixelate = createClass(filters.BaseFilter, /** @lends fabric.Image.filters.Pixelate.prototype */ {\n\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'Pixelate',\n\n blocksize: 4,\n\n mainParameter: 'blocksize',\n\n /**\n * Fragment source for the Pixelate program\n */\n fragmentSource: 'precision highp float;\\n' +\n 'uniform sampler2D uTexture;\\n' +\n 'uniform float uBlocksize;\\n' +\n 'uniform float uStepW;\\n' +\n 'uniform float uStepH;\\n' +\n 'varying vec2 vTexCoord;\\n' +\n 'void main() {\\n' +\n 'float blockW = uBlocksize * uStepW;\\n' +\n 'float blockH = uBlocksize * uStepW;\\n' +\n 'int posX = int(vTexCoord.x / blockW);\\n' +\n 'int posY = int(vTexCoord.y / blockH);\\n' +\n 'float fposX = float(posX);\\n' +\n 'float fposY = float(posY);\\n' +\n 'vec2 squareCoords = vec2(fposX * blockW, fposY * blockH);\\n' +\n 'vec4 color = texture2D(uTexture, squareCoords);\\n' +\n 'gl_FragColor = color;\\n' +\n '}',\n\n /**\n * Apply the Pixelate operation to a Uint8ClampedArray representing the pixels of an image.\n *\n * @param {Object} options\n * @param {ImageData} options.imageData The Uint8ClampedArray to be filtered.\n */\n applyTo2d: function(options) {\n var imageData = options.imageData,\n data = imageData.data,\n iLen = imageData.height,\n jLen = imageData.width,\n index, i, j, r, g, b, a,\n _i, _j, _iLen, _jLen;\n\n for (i = 0; i < iLen; i += this.blocksize) {\n for (j = 0; j < jLen; j += this.blocksize) {\n\n index = (i * 4) * jLen + (j * 4);\n\n r = data[index];\n g = data[index + 1];\n b = data[index + 2];\n a = data[index + 3];\n\n _iLen = Math.min(i + this.blocksize, iLen);\n _jLen = Math.min(j + this.blocksize, jLen);\n for (_i = i; _i < _iLen; _i++) {\n for (_j = j; _j < _jLen; _j++) {\n index = (_i * 4) * jLen + (_j * 4);\n data[index] = r;\n data[index + 1] = g;\n data[index + 2] = b;\n data[index + 3] = a;\n }\n }\n }\n }\n },\n\n /**\n * Indicate when the filter is not gonna apply changes to the image\n **/\n isNeutralState: function() {\n return this.blocksize === 1;\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function(gl, program) {\n return {\n uBlocksize: gl.getUniformLocation(program, 'uBlocksize'),\n uStepW: gl.getUniformLocation(program, 'uStepW'),\n uStepH: gl.getUniformLocation(program, 'uStepH'),\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function(gl, uniformLocations) {\n gl.uniform1f(uniformLocations.uBlocksize, this.blocksize);\n },\n });\n\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {Function} [callback] to be invoked after filter creation\n * @return {fabric.Image.filters.Pixelate} Instance of fabric.Image.filters.Pixelate\n */\n fabric.Image.filters.Pixelate.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }),\n extend = fabric.util.object.extend,\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n\n /**\n * Remove white filter class\n * @class fabric.Image.filters.RemoveColor\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link fabric.Image.filters.RemoveColor#initialize} for constructor definition\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @example\n * var filter = new fabric.Image.filters.RemoveColor({\n * threshold: 0.2,\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n * canvas.renderAll();\n */\n filters.RemoveColor = createClass(filters.BaseFilter, /** @lends fabric.Image.filters.RemoveColor.prototype */ {\n\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'RemoveColor',\n\n /**\n * Color to remove, in any format understood by fabric.Color.\n * @param {String} type\n * @default\n */\n color: '#FFFFFF',\n\n /**\n * Fragment source for the brightness program\n */\n fragmentSource: 'precision highp float;\\n' +\n 'uniform sampler2D uTexture;\\n' +\n 'uniform vec4 uLow;\\n' +\n 'uniform vec4 uHigh;\\n' +\n 'varying vec2 vTexCoord;\\n' +\n 'void main() {\\n' +\n 'gl_FragColor = texture2D(uTexture, vTexCoord);\\n' +\n 'if(all(greaterThan(gl_FragColor.rgb,uLow.rgb)) && all(greaterThan(uHigh.rgb,gl_FragColor.rgb))) {\\n' +\n 'gl_FragColor.a = 0.0;\\n' +\n '}\\n' +\n '}',\n\n /**\n * distance to actual color, as value up or down from each r,g,b\n * between 0 and 1\n **/\n distance: 0.02,\n\n /**\n * For color to remove inside distance, use alpha channel for a smoother deletion\n * NOT IMPLEMENTED YET\n **/\n useAlpha: false,\n\n /**\n * Constructor\n * @memberOf fabric.Image.filters.RemoveWhite.prototype\n * @param {Object} [options] Options object\n * @param {Number} [options.color=#RRGGBB] Threshold value\n * @param {Number} [options.distance=10] Distance value\n */\n\n /**\n * Applies filter to canvas element\n * @param {Object} canvasEl Canvas element to apply filter to\n */\n applyTo2d: function(options) {\n var imageData = options.imageData,\n data = imageData.data, i,\n distance = this.distance * 255,\n r, g, b,\n source = new fabric.Color(this.color).getSource(),\n lowC = [\n source[0] - distance,\n source[1] - distance,\n source[2] - distance,\n ],\n highC = [\n source[0] + distance,\n source[1] + distance,\n source[2] + distance,\n ];\n\n\n for (i = 0; i < data.length; i += 4) {\n r = data[i];\n g = data[i + 1];\n b = data[i + 2];\n\n if (r > lowC[0] &&\n g > lowC[1] &&\n b > lowC[2] &&\n r < highC[0] &&\n g < highC[1] &&\n b < highC[2]) {\n data[i + 3] = 0;\n }\n }\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function(gl, program) {\n return {\n uLow: gl.getUniformLocation(program, 'uLow'),\n uHigh: gl.getUniformLocation(program, 'uHigh'),\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function(gl, uniformLocations) {\n var source = new fabric.Color(this.color).getSource(),\n distance = parseFloat(this.distance),\n lowC = [\n 0 + source[0] / 255 - distance,\n 0 + source[1] / 255 - distance,\n 0 + source[2] / 255 - distance,\n 1\n ],\n highC = [\n source[0] / 255 + distance,\n source[1] / 255 + distance,\n source[2] / 255 + distance,\n 1\n ];\n gl.uniform4fv(uniformLocations.uLow, lowC);\n gl.uniform4fv(uniformLocations.uHigh, highC);\n },\n\n /**\n * Returns object representation of an instance\n * @return {Object} Object representation of an instance\n */\n toObject: function() {\n return extend(this.callSuper('toObject'), {\n color: this.color,\n distance: this.distance\n });\n }\n });\n\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {Function} [callback] to be invoked after filter creation\n * @return {fabric.Image.filters.RemoveColor} Instance of fabric.Image.filters.RemoveWhite\n */\n fabric.Image.filters.RemoveColor.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }),\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n\n var matrices = {\n Brownie: [\n 0.59970,0.34553,-0.27082,0,0.186,\n -0.03770,0.86095,0.15059,0,-0.1449,\n 0.24113,-0.07441,0.44972,0,-0.02965,\n 0,0,0,1,0\n ],\n Vintage: [\n 0.62793,0.32021,-0.03965,0,0.03784,\n 0.02578,0.64411,0.03259,0,0.02926,\n 0.04660,-0.08512,0.52416,0,0.02023,\n 0,0,0,1,0\n ],\n Kodachrome: [\n 1.12855,-0.39673,-0.03992,0,0.24991,\n -0.16404,1.08352,-0.05498,0,0.09698,\n -0.16786,-0.56034,1.60148,0,0.13972,\n 0,0,0,1,0\n ],\n Technicolor: [\n 1.91252,-0.85453,-0.09155,0,0.04624,\n -0.30878,1.76589,-0.10601,0,-0.27589,\n -0.23110,-0.75018,1.84759,0,0.12137,\n 0,0,0,1,0\n ],\n Polaroid: [\n 1.438,-0.062,-0.062,0,0,\n -0.122,1.378,-0.122,0,0,\n -0.016,-0.016,1.483,0,0,\n 0,0,0,1,0\n ],\n Sepia: [\n 0.393, 0.769, 0.189, 0, 0,\n 0.349, 0.686, 0.168, 0, 0,\n 0.272, 0.534, 0.131, 0, 0,\n 0, 0, 0, 1, 0\n ],\n BlackWhite: [\n 1.5, 1.5, 1.5, 0, -1,\n 1.5, 1.5, 1.5, 0, -1,\n 1.5, 1.5, 1.5, 0, -1,\n 0, 0, 0, 1, 0,\n ]\n };\n\n for (var key in matrices) {\n filters[key] = createClass(filters.ColorMatrix, /** @lends fabric.Image.filters.Sepia.prototype */ {\n\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: key,\n\n /**\n * Colormatrix for the effect\n * array of 20 floats. Numbers in positions 4, 9, 14, 19 loose meaning\n * outside the -1, 1 range.\n * @param {Array} matrix array of 20 numbers.\n * @default\n */\n matrix: matrices[key],\n\n /**\n * Lock the matrix export for this kind of static, parameter less filters.\n */\n mainParameter: false,\n /**\n * Lock the colormatrix on the color part, skipping alpha\n */\n colorsOnly: true,\n\n });\n fabric.Image.filters[key].fromObject = fabric.Image.filters.BaseFilter.fromObject;\n }\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n 'use strict';\n\n var fabric = global.fabric,\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n\n /**\n * Color Blend filter class\n * @class fabric.Image.filter.BlendColor\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @example\n * var filter = new fabric.Image.filters.BlendColor({\n * color: '#000',\n * mode: 'multiply'\n * });\n *\n * var filter = new fabric.Image.filters.BlendImage({\n * image: fabricImageObject,\n * mode: 'multiply',\n * alpha: 0.5\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n * canvas.renderAll();\n */\n\n filters.BlendColor = createClass(filters.BaseFilter, /** @lends fabric.Image.filters.Blend.prototype */ {\n type: 'BlendColor',\n\n /**\n * Color to make the blend operation with. default to a reddish color since black or white\n * gives always strong result.\n **/\n color: '#F95C63',\n\n /**\n * Blend mode for the filter: one of multiply, add, diff, screen, subtract,\n * darken, lighten, overlay, exclusion, tint.\n **/\n mode: 'multiply',\n\n /**\n * alpha value. represent the strength of the blend color operation.\n **/\n alpha: 1,\n\n /**\n * Fragment source for the Multiply program\n */\n fragmentSource: {\n multiply: 'gl_FragColor.rgb *= uColor.rgb;\\n',\n screen: 'gl_FragColor.rgb = 1.0 - (1.0 - gl_FragColor.rgb) * (1.0 - uColor.rgb);\\n',\n add: 'gl_FragColor.rgb += uColor.rgb;\\n',\n diff: 'gl_FragColor.rgb = abs(gl_FragColor.rgb - uColor.rgb);\\n',\n subtract: 'gl_FragColor.rgb -= uColor.rgb;\\n',\n lighten: 'gl_FragColor.rgb = max(gl_FragColor.rgb, uColor.rgb);\\n',\n darken: 'gl_FragColor.rgb = min(gl_FragColor.rgb, uColor.rgb);\\n',\n exclusion: 'gl_FragColor.rgb += uColor.rgb - 2.0 * (uColor.rgb * gl_FragColor.rgb);\\n',\n overlay: 'if (uColor.r < 0.5) {\\n' +\n 'gl_FragColor.r *= 2.0 * uColor.r;\\n' +\n '} else {\\n' +\n 'gl_FragColor.r = 1.0 - 2.0 * (1.0 - gl_FragColor.r) * (1.0 - uColor.r);\\n' +\n '}\\n' +\n 'if (uColor.g < 0.5) {\\n' +\n 'gl_FragColor.g *= 2.0 * uColor.g;\\n' +\n '} else {\\n' +\n 'gl_FragColor.g = 1.0 - 2.0 * (1.0 - gl_FragColor.g) * (1.0 - uColor.g);\\n' +\n '}\\n' +\n 'if (uColor.b < 0.5) {\\n' +\n 'gl_FragColor.b *= 2.0 * uColor.b;\\n' +\n '} else {\\n' +\n 'gl_FragColor.b = 1.0 - 2.0 * (1.0 - gl_FragColor.b) * (1.0 - uColor.b);\\n' +\n '}\\n',\n tint: 'gl_FragColor.rgb *= (1.0 - uColor.a);\\n' +\n 'gl_FragColor.rgb += uColor.rgb;\\n',\n },\n\n /**\n * build the fragment source for the filters, joining the common part with\n * the specific one.\n * @param {String} mode the mode of the filter, a key of this.fragmentSource\n * @return {String} the source to be compiled\n * @private\n */\n buildSource: function(mode) {\n return 'precision highp float;\\n' +\n 'uniform sampler2D uTexture;\\n' +\n 'uniform vec4 uColor;\\n' +\n 'varying vec2 vTexCoord;\\n' +\n 'void main() {\\n' +\n 'vec4 color = texture2D(uTexture, vTexCoord);\\n' +\n 'gl_FragColor = color;\\n' +\n 'if (color.a > 0.0) {\\n' +\n this.fragmentSource[mode] +\n '}\\n' +\n '}';\n },\n\n /**\n * Retrieves the cached shader.\n * @param {Object} options\n * @param {WebGLRenderingContext} options.context The GL context used for rendering.\n * @param {Object} options.programCache A map of compiled shader programs, keyed by filter type.\n */\n retrieveShader: function(options) {\n var cacheKey = this.type + '_' + this.mode, shaderSource;\n if (!options.programCache.hasOwnProperty(cacheKey)) {\n shaderSource = this.buildSource(this.mode);\n options.programCache[cacheKey] = this.createProgram(options.context, shaderSource);\n }\n return options.programCache[cacheKey];\n },\n\n /**\n * Apply the Blend operation to a Uint8ClampedArray representing the pixels of an image.\n *\n * @param {Object} options\n * @param {ImageData} options.imageData The Uint8ClampedArray to be filtered.\n */\n applyTo2d: function(options) {\n var imageData = options.imageData,\n data = imageData.data, iLen = data.length,\n tr, tg, tb,\n r, g, b,\n source, alpha1 = 1 - this.alpha;\n\n source = new fabric.Color(this.color).getSource();\n tr = source[0] * this.alpha;\n tg = source[1] * this.alpha;\n tb = source[2] * this.alpha;\n\n for (var i = 0; i < iLen; i += 4) {\n\n r = data[i];\n g = data[i + 1];\n b = data[i + 2];\n\n switch (this.mode) {\n case 'multiply':\n data[i] = r * tr / 255;\n data[i + 1] = g * tg / 255;\n data[i + 2] = b * tb / 255;\n break;\n case 'screen':\n data[i] = 255 - (255 - r) * (255 - tr) / 255;\n data[i + 1] = 255 - (255 - g) * (255 - tg) / 255;\n data[i + 2] = 255 - (255 - b) * (255 - tb) / 255;\n break;\n case 'add':\n data[i] = r + tr;\n data[i + 1] = g + tg;\n data[i + 2] = b + tb;\n break;\n case 'diff':\n case 'difference':\n data[i] = Math.abs(r - tr);\n data[i + 1] = Math.abs(g - tg);\n data[i + 2] = Math.abs(b - tb);\n break;\n case 'subtract':\n data[i] = r - tr;\n data[i + 1] = g - tg;\n data[i + 2] = b - tb;\n break;\n case 'darken':\n data[i] = Math.min(r, tr);\n data[i + 1] = Math.min(g, tg);\n data[i + 2] = Math.min(b, tb);\n break;\n case 'lighten':\n data[i] = Math.max(r, tr);\n data[i + 1] = Math.max(g, tg);\n data[i + 2] = Math.max(b, tb);\n break;\n case 'overlay':\n data[i] = tr < 128 ? (2 * r * tr / 255) : (255 - 2 * (255 - r) * (255 - tr) / 255);\n data[i + 1] = tg < 128 ? (2 * g * tg / 255) : (255 - 2 * (255 - g) * (255 - tg) / 255);\n data[i + 2] = tb < 128 ? (2 * b * tb / 255) : (255 - 2 * (255 - b) * (255 - tb) / 255);\n break;\n case 'exclusion':\n data[i] = tr + r - ((2 * tr * r) / 255);\n data[i + 1] = tg + g - ((2 * tg * g) / 255);\n data[i + 2] = tb + b - ((2 * tb * b) / 255);\n break;\n case 'tint':\n data[i] = tr + r * alpha1;\n data[i + 1] = tg + g * alpha1;\n data[i + 2] = tb + b * alpha1;\n }\n }\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function(gl, program) {\n return {\n uColor: gl.getUniformLocation(program, 'uColor'),\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function(gl, uniformLocations) {\n var source = new fabric.Color(this.color).getSource();\n source[0] = this.alpha * source[0] / 255;\n source[1] = this.alpha * source[1] / 255;\n source[2] = this.alpha * source[2] / 255;\n source[3] = this.alpha;\n gl.uniform4fv(uniformLocations.uColor, source);\n },\n\n /**\n * Returns object representation of an instance\n * @return {Object} Object representation of an instance\n */\n toObject: function() {\n return {\n type: this.type,\n color: this.color,\n mode: this.mode,\n alpha: this.alpha\n };\n }\n });\n\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] to be invoked after filter creation\n * @return {fabric.Image.filters.BlendColor} Instance of fabric.Image.filters.BlendColor\n */\n fabric.Image.filters.BlendColor.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n 'use strict';\n\n var fabric = global.fabric,\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n\n /**\n * Image Blend filter class\n * @class fabric.Image.filter.BlendImage\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @example\n * var filter = new fabric.Image.filters.BlendColor({\n * color: '#000',\n * mode: 'multiply'\n * });\n *\n * var filter = new fabric.Image.filters.BlendImage({\n * image: fabricImageObject,\n * mode: 'multiply',\n * alpha: 0.5\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n * canvas.renderAll();\n */\n\n filters.BlendImage = createClass(filters.BaseFilter, /** @lends fabric.Image.filters.BlendImage.prototype */ {\n type: 'BlendImage',\n\n /**\n * Color to make the blend operation with. default to a reddish color since black or white\n * gives always strong result.\n **/\n image: null,\n\n /**\n * Blend mode for the filter: one of multiply, add, diff, screen, subtract,\n * darken, lighten, overlay, exclusion, tint.\n **/\n mode: 'multiply',\n\n /**\n * alpha value. represent the strength of the blend image operation.\n * not implemented.\n **/\n alpha: 1,\n\n vertexSource: 'attribute vec2 aPosition;\\n' +\n 'varying vec2 vTexCoord;\\n' +\n 'varying vec2 vTexCoord2;\\n' +\n 'uniform mat3 uTransformMatrix;\\n' +\n 'void main() {\\n' +\n 'vTexCoord = aPosition;\\n' +\n 'vTexCoord2 = (uTransformMatrix * vec3(aPosition, 1.0)).xy;\\n' +\n 'gl_Position = vec4(aPosition * 2.0 - 1.0, 0.0, 1.0);\\n' +\n '}',\n\n /**\n * Fragment source for the Multiply program\n */\n fragmentSource: {\n multiply: 'precision highp float;\\n' +\n 'uniform sampler2D uTexture;\\n' +\n 'uniform sampler2D uImage;\\n' +\n 'uniform vec4 uColor;\\n' +\n 'varying vec2 vTexCoord;\\n' +\n 'varying vec2 vTexCoord2;\\n' +\n 'void main() {\\n' +\n 'vec4 color = texture2D(uTexture, vTexCoord);\\n' +\n 'vec4 color2 = texture2D(uImage, vTexCoord2);\\n' +\n 'color.rgba *= color2.rgba;\\n' +\n 'gl_FragColor = color;\\n' +\n '}',\n mask: 'precision highp float;\\n' +\n 'uniform sampler2D uTexture;\\n' +\n 'uniform sampler2D uImage;\\n' +\n 'uniform vec4 uColor;\\n' +\n 'varying vec2 vTexCoord;\\n' +\n 'varying vec2 vTexCoord2;\\n' +\n 'void main() {\\n' +\n 'vec4 color = texture2D(uTexture, vTexCoord);\\n' +\n 'vec4 color2 = texture2D(uImage, vTexCoord2);\\n' +\n 'color.a = color2.a;\\n' +\n 'gl_FragColor = color;\\n' +\n '}',\n },\n\n /**\n * Retrieves the cached shader.\n * @param {Object} options\n * @param {WebGLRenderingContext} options.context The GL context used for rendering.\n * @param {Object} options.programCache A map of compiled shader programs, keyed by filter type.\n */\n retrieveShader: function(options) {\n var cacheKey = this.type + '_' + this.mode;\n var shaderSource = this.fragmentSource[this.mode];\n if (!options.programCache.hasOwnProperty(cacheKey)) {\n options.programCache[cacheKey] = this.createProgram(options.context, shaderSource);\n }\n return options.programCache[cacheKey];\n },\n\n applyToWebGL: function(options) {\n // load texture to blend.\n var gl = options.context,\n texture = this.createTexture(options.filterBackend, this.image);\n this.bindAdditionalTexture(gl, texture, gl.TEXTURE1);\n this.callSuper('applyToWebGL', options);\n this.unbindAdditionalTexture(gl, gl.TEXTURE1);\n },\n\n createTexture: function(backend, image) {\n return backend.getCachedTexture(image.cacheKey, image._element);\n },\n\n /**\n * Calculate a transformMatrix to adapt the image to blend over\n * @param {Object} options\n * @param {WebGLRenderingContext} options.context The GL context used for rendering.\n * @param {Object} options.programCache A map of compiled shader programs, keyed by filter type.\n */\n calculateMatrix: function() {\n var image = this.image,\n width = image._element.width,\n height = image._element.height;\n return [\n 1 / image.scaleX, 0, 0,\n 0, 1 / image.scaleY, 0,\n -image.left / width, -image.top / height, 1\n ];\n },\n\n /**\n * Apply the Blend operation to a Uint8ClampedArray representing the pixels of an image.\n *\n * @param {Object} options\n * @param {ImageData} options.imageData The Uint8ClampedArray to be filtered.\n */\n applyTo2d: function(options) {\n var imageData = options.imageData,\n resources = options.filterBackend.resources,\n data = imageData.data, iLen = data.length,\n width = imageData.width,\n height = imageData.height,\n tr, tg, tb, ta,\n r, g, b, a,\n canvas1, context, image = this.image, blendData;\n\n if (!resources.blendImage) {\n resources.blendImage = fabric.util.createCanvasElement();\n }\n canvas1 = resources.blendImage;\n context = canvas1.getContext('2d');\n if (canvas1.width !== width || canvas1.height !== height) {\n canvas1.width = width;\n canvas1.height = height;\n }\n else {\n context.clearRect(0, 0, width, height);\n }\n context.setTransform(image.scaleX, 0, 0, image.scaleY, image.left, image.top);\n context.drawImage(image._element, 0, 0, width, height);\n blendData = context.getImageData(0, 0, width, height).data;\n for (var i = 0; i < iLen; i += 4) {\n\n r = data[i];\n g = data[i + 1];\n b = data[i + 2];\n a = data[i + 3];\n\n tr = blendData[i];\n tg = blendData[i + 1];\n tb = blendData[i + 2];\n ta = blendData[i + 3];\n\n switch (this.mode) {\n case 'multiply':\n data[i] = r * tr / 255;\n data[i + 1] = g * tg / 255;\n data[i + 2] = b * tb / 255;\n data[i + 3] = a * ta / 255;\n break;\n case 'mask':\n data[i + 3] = ta;\n break;\n }\n }\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function(gl, program) {\n return {\n uTransformMatrix: gl.getUniformLocation(program, 'uTransformMatrix'),\n uImage: gl.getUniformLocation(program, 'uImage'),\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function(gl, uniformLocations) {\n var matrix = this.calculateMatrix();\n gl.uniform1i(uniformLocations.uImage, 1); // texture unit 1.\n gl.uniformMatrix3fv(uniformLocations.uTransformMatrix, false, matrix);\n },\n\n /**\n * Returns object representation of an instance\n * @return {Object} Object representation of an instance\n */\n toObject: function() {\n return {\n type: this.type,\n image: this.image && this.image.toObject(),\n mode: this.mode,\n alpha: this.alpha\n };\n }\n });\n\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {function} callback to be invoked after filter creation\n * @return {fabric.Image.filters.BlendImage} Instance of fabric.Image.filters.BlendImage\n */\n fabric.Image.filters.BlendImage.fromObject = function(object, callback) {\n fabric.Image.fromObject(object.image, function(image) {\n var options = fabric.util.object.clone(object);\n options.image = image;\n callback(new fabric.Image.filters.BlendImage(options));\n });\n };\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }), pow = Math.pow, floor = Math.floor,\n sqrt = Math.sqrt, abs = Math.abs, round = Math.round, sin = Math.sin,\n ceil = Math.ceil,\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n\n /**\n * Resize image filter class\n * @class fabric.Image.filters.Resize\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @example\n * var filter = new fabric.Image.filters.Resize();\n * object.filters.push(filter);\n * object.applyFilters(canvas.renderAll.bind(canvas));\n */\n filters.Resize = createClass(filters.BaseFilter, /** @lends fabric.Image.filters.Resize.prototype */ {\n\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'Resize',\n\n /**\n * Resize type\n * for webgl resizeType is just lanczos, for canvas2d can be:\n * bilinear, hermite, sliceHack, lanczos.\n * @param {String} resizeType\n * @default\n */\n resizeType: 'hermite',\n\n /**\n * Scale factor for resizing, x axis\n * @param {Number} scaleX\n * @default\n */\n scaleX: 1,\n\n /**\n * Scale factor for resizing, y axis\n * @param {Number} scaleY\n * @default\n */\n scaleY: 1,\n\n /**\n * LanczosLobes parameter for lanczos filter, valid for resizeType lanczos\n * @param {Number} lanczosLobes\n * @default\n */\n lanczosLobes: 3,\n\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function(gl, program) {\n return {\n uDelta: gl.getUniformLocation(program, 'uDelta'),\n uTaps: gl.getUniformLocation(program, 'uTaps'),\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function(gl, uniformLocations) {\n gl.uniform2fv(uniformLocations.uDelta, this.horizontal ? [1 / this.width, 0] : [0, 1 / this.height]);\n gl.uniform1fv(uniformLocations.uTaps, this.taps);\n },\n\n /**\n * Retrieves the cached shader.\n * @param {Object} options\n * @param {WebGLRenderingContext} options.context The GL context used for rendering.\n * @param {Object} options.programCache A map of compiled shader programs, keyed by filter type.\n */\n retrieveShader: function(options) {\n var filterWindow = this.getFilterWindow(), cacheKey = this.type + '_' + filterWindow;\n if (!options.programCache.hasOwnProperty(cacheKey)) {\n var fragmentShader = this.generateShader(filterWindow);\n options.programCache[cacheKey] = this.createProgram(options.context, fragmentShader);\n }\n return options.programCache[cacheKey];\n },\n\n getFilterWindow: function() {\n var scale = this.tempScale;\n return Math.ceil(this.lanczosLobes / scale);\n },\n\n getTaps: function() {\n var lobeFunction = this.lanczosCreate(this.lanczosLobes), scale = this.tempScale,\n filterWindow = this.getFilterWindow(), taps = new Array(filterWindow);\n for (var i = 1; i <= filterWindow; i++) {\n taps[i - 1] = lobeFunction(i * scale);\n }\n return taps;\n },\n\n /**\n * Generate vertex and shader sources from the necessary steps numbers\n * @param {Number} filterWindow\n */\n generateShader: function(filterWindow) {\n var offsets = new Array(filterWindow),\n fragmentShader = this.fragmentSourceTOP, filterWindow;\n\n for (var i = 1; i <= filterWindow; i++) {\n offsets[i - 1] = i + '.0 * uDelta';\n }\n\n fragmentShader += 'uniform float uTaps[' + filterWindow + '];\\n';\n fragmentShader += 'void main() {\\n';\n fragmentShader += ' vec4 color = texture2D(uTexture, vTexCoord);\\n';\n fragmentShader += ' float sum = 1.0;\\n';\n\n offsets.forEach(function(offset, i) {\n fragmentShader += ' color += texture2D(uTexture, vTexCoord + ' + offset + ') * uTaps[' + i + '];\\n';\n fragmentShader += ' color += texture2D(uTexture, vTexCoord - ' + offset + ') * uTaps[' + i + '];\\n';\n fragmentShader += ' sum += 2.0 * uTaps[' + i + '];\\n';\n });\n fragmentShader += ' gl_FragColor = color / sum;\\n';\n fragmentShader += '}';\n return fragmentShader;\n },\n\n fragmentSourceTOP: 'precision highp float;\\n' +\n 'uniform sampler2D uTexture;\\n' +\n 'uniform vec2 uDelta;\\n' +\n 'varying vec2 vTexCoord;\\n',\n\n /**\n * Apply the resize filter to the image\n * Determines whether to use WebGL or Canvas2D based on the options.webgl flag.\n *\n * @param {Object} options\n * @param {Number} options.passes The number of filters remaining to be executed\n * @param {Boolean} options.webgl Whether to use webgl to render the filter.\n * @param {WebGLTexture} options.sourceTexture The texture setup as the source to be filtered.\n * @param {WebGLTexture} options.targetTexture The texture where filtered output should be drawn.\n * @param {WebGLRenderingContext} options.context The GL context used for rendering.\n * @param {Object} options.programCache A map of compiled shader programs, keyed by filter type.\n */\n applyTo: function(options) {\n if (options.webgl) {\n options.passes++;\n this.width = options.sourceWidth;\n this.horizontal = true;\n this.dW = Math.round(this.width * this.scaleX);\n this.dH = options.sourceHeight;\n this.tempScale = this.dW / this.width;\n this.taps = this.getTaps();\n options.destinationWidth = this.dW;\n this._setupFrameBuffer(options);\n this.applyToWebGL(options);\n this._swapTextures(options);\n options.sourceWidth = options.destinationWidth;\n\n this.height = options.sourceHeight;\n this.horizontal = false;\n this.dH = Math.round(this.height * this.scaleY);\n this.tempScale = this.dH / this.height;\n this.taps = this.getTaps();\n options.destinationHeight = this.dH;\n this._setupFrameBuffer(options);\n this.applyToWebGL(options);\n this._swapTextures(options);\n options.sourceHeight = options.destinationHeight;\n }\n else {\n this.applyTo2d(options);\n }\n },\n\n isNeutralState: function() {\n return this.scaleX === 1 && this.scaleY === 1;\n },\n\n lanczosCreate: function(lobes) {\n return function(x) {\n if (x >= lobes || x <= -lobes) {\n return 0.0;\n }\n if (x < 1.19209290E-07 && x > -1.19209290E-07) {\n return 1.0;\n }\n x *= Math.PI;\n var xx = x / lobes;\n return (sin(x) / x) * sin(xx) / xx;\n };\n },\n\n /**\n * Applies filter to canvas element\n * @memberOf fabric.Image.filters.Resize.prototype\n * @param {Object} canvasEl Canvas element to apply filter to\n * @param {Number} scaleX\n * @param {Number} scaleY\n */\n applyTo2d: function(options) {\n var imageData = options.imageData,\n scaleX = this.scaleX,\n scaleY = this.scaleY;\n\n this.rcpScaleX = 1 / scaleX;\n this.rcpScaleY = 1 / scaleY;\n\n var oW = imageData.width, oH = imageData.height,\n dW = round(oW * scaleX), dH = round(oH * scaleY),\n newData;\n\n if (this.resizeType === 'sliceHack') {\n newData = this.sliceByTwo(options, oW, oH, dW, dH);\n }\n else if (this.resizeType === 'hermite') {\n newData = this.hermiteFastResize(options, oW, oH, dW, dH);\n }\n else if (this.resizeType === 'bilinear') {\n newData = this.bilinearFiltering(options, oW, oH, dW, dH);\n }\n else if (this.resizeType === 'lanczos') {\n newData = this.lanczosResize(options, oW, oH, dW, dH);\n }\n options.imageData = newData;\n },\n\n /**\n * Filter sliceByTwo\n * @param {Object} canvasEl Canvas element to apply filter to\n * @param {Number} oW Original Width\n * @param {Number} oH Original Height\n * @param {Number} dW Destination Width\n * @param {Number} dH Destination Height\n * @returns {ImageData}\n */\n sliceByTwo: function(options, oW, oH, dW, dH) {\n var imageData = options.imageData,\n mult = 0.5, doneW = false, doneH = false, stepW = oW * mult,\n stepH = oH * mult, resources = fabric.filterBackend.resources,\n tmpCanvas, ctx, sX = 0, sY = 0, dX = oW, dY = 0;\n if (!resources.sliceByTwo) {\n resources.sliceByTwo = document.createElement('canvas');\n }\n tmpCanvas = resources.sliceByTwo;\n if (tmpCanvas.width < oW * 1.5 || tmpCanvas.height < oH) {\n tmpCanvas.width = oW * 1.5;\n tmpCanvas.height = oH;\n }\n ctx = tmpCanvas.getContext('2d');\n ctx.clearRect(0, 0, oW * 1.5, oH);\n ctx.putImageData(imageData, 0, 0);\n\n dW = floor(dW);\n dH = floor(dH);\n\n while (!doneW || !doneH) {\n oW = stepW;\n oH = stepH;\n if (dW < floor(stepW * mult)) {\n stepW = floor(stepW * mult);\n }\n else {\n stepW = dW;\n doneW = true;\n }\n if (dH < floor(stepH * mult)) {\n stepH = floor(stepH * mult);\n }\n else {\n stepH = dH;\n doneH = true;\n }\n ctx.drawImage(tmpCanvas, sX, sY, oW, oH, dX, dY, stepW, stepH);\n sX = dX;\n sY = dY;\n dY += stepH;\n }\n return ctx.getImageData(sX, sY, dW, dH);\n },\n\n /**\n * Filter lanczosResize\n * @param {Object} canvasEl Canvas element to apply filter to\n * @param {Number} oW Original Width\n * @param {Number} oH Original Height\n * @param {Number} dW Destination Width\n * @param {Number} dH Destination Height\n * @returns {ImageData}\n */\n lanczosResize: function(options, oW, oH, dW, dH) {\n\n function process(u) {\n var v, i, weight, idx, a, red, green,\n blue, alpha, fX, fY;\n center.x = (u + 0.5) * ratioX;\n icenter.x = floor(center.x);\n for (v = 0; v < dH; v++) {\n center.y = (v + 0.5) * ratioY;\n icenter.y = floor(center.y);\n a = 0; red = 0; green = 0; blue = 0; alpha = 0;\n for (i = icenter.x - range2X; i <= icenter.x + range2X; i++) {\n if (i < 0 || i >= oW) {\n continue;\n }\n fX = floor(1000 * abs(i - center.x));\n if (!cacheLanc[fX]) {\n cacheLanc[fX] = { };\n }\n for (var j = icenter.y - range2Y; j <= icenter.y + range2Y; j++) {\n if (j < 0 || j >= oH) {\n continue;\n }\n fY = floor(1000 * abs(j - center.y));\n if (!cacheLanc[fX][fY]) {\n cacheLanc[fX][fY] = lanczos(sqrt(pow(fX * rcpRatioX, 2) + pow(fY * rcpRatioY, 2)) / 1000);\n }\n weight = cacheLanc[fX][fY];\n if (weight > 0) {\n idx = (j * oW + i) * 4;\n a += weight;\n red += weight * srcData[idx];\n green += weight * srcData[idx + 1];\n blue += weight * srcData[idx + 2];\n alpha += weight * srcData[idx + 3];\n }\n }\n }\n idx = (v * dW + u) * 4;\n destData[idx] = red / a;\n destData[idx + 1] = green / a;\n destData[idx + 2] = blue / a;\n destData[idx + 3] = alpha / a;\n }\n\n if (++u < dW) {\n return process(u);\n }\n else {\n return destImg;\n }\n }\n\n var srcData = options.imageData.data,\n destImg = options.ctx.createImageData(dW, dH),\n destData = destImg.data,\n lanczos = this.lanczosCreate(this.lanczosLobes),\n ratioX = this.rcpScaleX, ratioY = this.rcpScaleY,\n rcpRatioX = 2 / this.rcpScaleX, rcpRatioY = 2 / this.rcpScaleY,\n range2X = ceil(ratioX * this.lanczosLobes / 2),\n range2Y = ceil(ratioY * this.lanczosLobes / 2),\n cacheLanc = { }, center = { }, icenter = { };\n\n return process(0);\n },\n\n /**\n * bilinearFiltering\n * @param {Object} canvasEl Canvas element to apply filter to\n * @param {Number} oW Original Width\n * @param {Number} oH Original Height\n * @param {Number} dW Destination Width\n * @param {Number} dH Destination Height\n * @returns {ImageData}\n */\n bilinearFiltering: function(options, oW, oH, dW, dH) {\n var a, b, c, d, x, y, i, j, xDiff, yDiff, chnl,\n color, offset = 0, origPix, ratioX = this.rcpScaleX,\n ratioY = this.rcpScaleY,\n w4 = 4 * (oW - 1), img = options.imageData,\n pixels = img.data, destImage = options.ctx.createImageData(dW, dH),\n destPixels = destImage.data;\n for (i = 0; i < dH; i++) {\n for (j = 0; j < dW; j++) {\n x = floor(ratioX * j);\n y = floor(ratioY * i);\n xDiff = ratioX * j - x;\n yDiff = ratioY * i - y;\n origPix = 4 * (y * oW + x);\n\n for (chnl = 0; chnl < 4; chnl++) {\n a = pixels[origPix + chnl];\n b = pixels[origPix + 4 + chnl];\n c = pixels[origPix + w4 + chnl];\n d = pixels[origPix + w4 + 4 + chnl];\n color = a * (1 - xDiff) * (1 - yDiff) + b * xDiff * (1 - yDiff) +\n c * yDiff * (1 - xDiff) + d * xDiff * yDiff;\n destPixels[offset++] = color;\n }\n }\n }\n return destImage;\n },\n\n /**\n * hermiteFastResize\n * @param {Object} canvasEl Canvas element to apply filter to\n * @param {Number} oW Original Width\n * @param {Number} oH Original Height\n * @param {Number} dW Destination Width\n * @param {Number} dH Destination Height\n * @returns {ImageData}\n */\n hermiteFastResize: function(options, oW, oH, dW, dH) {\n var ratioW = this.rcpScaleX, ratioH = this.rcpScaleY,\n ratioWHalf = ceil(ratioW / 2),\n ratioHHalf = ceil(ratioH / 2),\n img = options.imageData, data = img.data,\n img2 = options.ctx.createImageData(dW, dH), data2 = img2.data;\n for (var j = 0; j < dH; j++) {\n for (var i = 0; i < dW; i++) {\n var x2 = (i + j * dW) * 4, weight = 0, weights = 0, weightsAlpha = 0,\n gxR = 0, gxG = 0, gxB = 0, gxA = 0, centerY = (j + 0.5) * ratioH;\n for (var yy = floor(j * ratioH); yy < (j + 1) * ratioH; yy++) {\n var dy = abs(centerY - (yy + 0.5)) / ratioHHalf,\n centerX = (i + 0.5) * ratioW, w0 = dy * dy;\n for (var xx = floor(i * ratioW); xx < (i + 1) * ratioW; xx++) {\n var dx = abs(centerX - (xx + 0.5)) / ratioWHalf,\n w = sqrt(w0 + dx * dx);\n /* eslint-disable max-depth */\n if (w > 1 && w < -1) {\n continue;\n }\n //hermite filter\n weight = 2 * w * w * w - 3 * w * w + 1;\n if (weight > 0) {\n dx = 4 * (xx + yy * oW);\n //alpha\n gxA += weight * data[dx + 3];\n weightsAlpha += weight;\n //colors\n if (data[dx + 3] < 255) {\n weight = weight * data[dx + 3] / 250;\n }\n gxR += weight * data[dx];\n gxG += weight * data[dx + 1];\n gxB += weight * data[dx + 2];\n weights += weight;\n }\n /* eslint-enable max-depth */\n }\n }\n data2[x2] = gxR / weights;\n data2[x2 + 1] = gxG / weights;\n data2[x2 + 2] = gxB / weights;\n data2[x2 + 3] = gxA / weightsAlpha;\n }\n }\n return img2;\n },\n\n /**\n * Returns object representation of an instance\n * @return {Object} Object representation of an instance\n */\n toObject: function() {\n return {\n type: this.type,\n scaleX: this.scaleX,\n scaleY: this.scaleY,\n resizeType: this.resizeType,\n lanczosLobes: this.lanczosLobes\n };\n }\n });\n\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {Function} [callback] to be invoked after filter creation\n * @return {fabric.Image.filters.Resize} Instance of fabric.Image.filters.Resize\n */\n fabric.Image.filters.Resize.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }),\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n\n /**\n * Contrast filter class\n * @class fabric.Image.filters.Contrast\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link fabric.Image.filters.Contrast#initialize} for constructor definition\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @example\n * var filter = new fabric.Image.filters.Contrast({\n * contrast: 0.25\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n */\n filters.Contrast = createClass(filters.BaseFilter, /** @lends fabric.Image.filters.Contrast.prototype */ {\n\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'Contrast',\n\n fragmentSource: 'precision highp float;\\n' +\n 'uniform sampler2D uTexture;\\n' +\n 'uniform float uContrast;\\n' +\n 'varying vec2 vTexCoord;\\n' +\n 'void main() {\\n' +\n 'vec4 color = texture2D(uTexture, vTexCoord);\\n' +\n 'float contrastF = 1.015 * (uContrast + 1.0) / (1.0 * (1.015 - uContrast));\\n' +\n 'color.rgb = contrastF * (color.rgb - 0.5) + 0.5;\\n' +\n 'gl_FragColor = color;\\n' +\n '}',\n\n /**\n * contrast value, range from -1 to 1.\n * @param {Number} contrast\n * @default 0\n */\n contrast: 0,\n\n mainParameter: 'contrast',\n\n /**\n * Constructor\n * @memberOf fabric.Image.filters.Contrast.prototype\n * @param {Object} [options] Options object\n * @param {Number} [options.contrast=0] Value to contrast the image up (-1...1)\n */\n\n /**\n * Apply the Contrast operation to a Uint8Array representing the pixels of an image.\n *\n * @param {Object} options\n * @param {ImageData} options.imageData The Uint8Array to be filtered.\n */\n applyTo2d: function(options) {\n if (this.contrast === 0) {\n return;\n }\n var imageData = options.imageData, i, len,\n data = imageData.data, len = data.length,\n contrast = Math.floor(this.contrast * 255),\n contrastF = 259 * (contrast + 255) / (255 * (259 - contrast));\n\n for (i = 0; i < len; i += 4) {\n data[i] = contrastF * (data[i] - 128) + 128;\n data[i + 1] = contrastF * (data[i + 1] - 128) + 128;\n data[i + 2] = contrastF * (data[i + 2] - 128) + 128;\n }\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function(gl, program) {\n return {\n uContrast: gl.getUniformLocation(program, 'uContrast'),\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function(gl, uniformLocations) {\n gl.uniform1f(uniformLocations.uContrast, this.contrast);\n },\n });\n\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] to be invoked after filter creation\n * @return {fabric.Image.filters.Contrast} Instance of fabric.Image.filters.Contrast\n */\n fabric.Image.filters.Contrast.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }),\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n\n /**\n * Saturate filter class\n * @class fabric.Image.filters.Saturation\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link fabric.Image.filters.Saturation#initialize} for constructor definition\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @example\n * var filter = new fabric.Image.filters.Saturation({\n * saturation: 100\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n */\n filters.Saturation = createClass(filters.BaseFilter, /** @lends fabric.Image.filters.Saturation.prototype */ {\n\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'Saturation',\n\n fragmentSource: 'precision highp float;\\n' +\n 'uniform sampler2D uTexture;\\n' +\n 'uniform float uSaturation;\\n' +\n 'varying vec2 vTexCoord;\\n' +\n 'void main() {\\n' +\n 'vec4 color = texture2D(uTexture, vTexCoord);\\n' +\n 'float rgMax = max(color.r, color.g);\\n' +\n 'float rgbMax = max(rgMax, color.b);\\n' +\n 'color.r += rgbMax != color.r ? (rgbMax - color.r) * uSaturation : 0.00;\\n' +\n 'color.g += rgbMax != color.g ? (rgbMax - color.g) * uSaturation : 0.00;\\n' +\n 'color.b += rgbMax != color.b ? (rgbMax - color.b) * uSaturation : 0.00;\\n' +\n 'gl_FragColor = color;\\n' +\n '}',\n\n saturation: 0,\n\n mainParameter: 'saturation',\n\n /**\n * Constructor\n * @memberOf fabric.Image.filters.Saturate.prototype\n * @param {Object} [options] Options object\n * @param {Number} [options.saturate=0] Value to saturate the image (-1...1)\n */\n\n /**\n * Apply the Saturation operation to a Uint8ClampedArray representing the pixels of an image.\n *\n * @param {Object} options\n * @param {ImageData} options.imageData The Uint8ClampedArray to be filtered.\n */\n applyTo2d: function(options) {\n if (this.saturation === 0) {\n return;\n }\n var imageData = options.imageData,\n data = imageData.data, len = data.length,\n adjust = -this.saturation, i, max;\n\n for (i = 0; i < len; i += 4) {\n max = Math.max(data[i], data[i + 1], data[i + 2]);\n data[i] += max !== data[i] ? (max - data[i]) * adjust : 0;\n data[i + 1] += max !== data[i + 1] ? (max - data[i + 1]) * adjust : 0;\n data[i + 2] += max !== data[i + 2] ? (max - data[i + 2]) * adjust : 0;\n }\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function(gl, program) {\n return {\n uSaturation: gl.getUniformLocation(program, 'uSaturation'),\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function(gl, uniformLocations) {\n gl.uniform1f(uniformLocations.uSaturation, -this.saturation);\n },\n });\n\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {Function} [callback] to be invoked after filter creation\n * @return {fabric.Image.filters.Saturation} Instance of fabric.Image.filters.Saturate\n */\n fabric.Image.filters.Saturation.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }),\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n\n /**\n * Blur filter class\n * @class fabric.Image.filters.Blur\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link fabric.Image.filters.Blur#initialize} for constructor definition\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @example\n * var filter = new fabric.Image.filters.Blur({\n * blur: 0.5\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n * canvas.renderAll();\n */\n filters.Blur = createClass(filters.BaseFilter, /** @lends fabric.Image.filters.Blur.prototype */ {\n\n type: 'Blur',\n\n /*\n'gl_FragColor = vec4(0.0);',\n'gl_FragColor += texture2D(texture, vTexCoord + -7 * uDelta)*0.0044299121055113265;',\n'gl_FragColor += texture2D(texture, vTexCoord + -6 * uDelta)*0.00895781211794;',\n'gl_FragColor += texture2D(texture, vTexCoord + -5 * uDelta)*0.0215963866053;',\n'gl_FragColor += texture2D(texture, vTexCoord + -4 * uDelta)*0.0443683338718;',\n'gl_FragColor += texture2D(texture, vTexCoord + -3 * uDelta)*0.0776744219933;',\n'gl_FragColor += texture2D(texture, vTexCoord + -2 * uDelta)*0.115876621105;',\n'gl_FragColor += texture2D(texture, vTexCoord + -1 * uDelta)*0.147308056121;',\n'gl_FragColor += texture2D(texture, vTexCoord )*0.159576912161;',\n'gl_FragColor += texture2D(texture, vTexCoord + 1 * uDelta)*0.147308056121;',\n'gl_FragColor += texture2D(texture, vTexCoord + 2 * uDelta)*0.115876621105;',\n'gl_FragColor += texture2D(texture, vTexCoord + 3 * uDelta)*0.0776744219933;',\n'gl_FragColor += texture2D(texture, vTexCoord + 4 * uDelta)*0.0443683338718;',\n'gl_FragColor += texture2D(texture, vTexCoord + 5 * uDelta)*0.0215963866053;',\n'gl_FragColor += texture2D(texture, vTexCoord + 6 * uDelta)*0.00895781211794;',\n'gl_FragColor += texture2D(texture, vTexCoord + 7 * uDelta)*0.0044299121055113265;',\n*/\n\n /* eslint-disable max-len */\n fragmentSource: 'precision highp float;\\n' +\n 'uniform sampler2D uTexture;\\n' +\n 'uniform vec2 uDelta;\\n' +\n 'varying vec2 vTexCoord;\\n' +\n 'const float nSamples = 15.0;\\n' +\n 'vec3 v3offset = vec3(12.9898, 78.233, 151.7182);\\n' +\n 'float random(vec3 scale) {\\n' +\n /* use the fragment position for a different seed per-pixel */\n 'return fract(sin(dot(gl_FragCoord.xyz, scale)) * 43758.5453);\\n' +\n '}\\n' +\n 'void main() {\\n' +\n 'vec4 color = vec4(0.0);\\n' +\n 'float total = 0.0;\\n' +\n 'float offset = random(v3offset);\\n' +\n 'for (float t = -nSamples; t <= nSamples; t++) {\\n' +\n 'float percent = (t + offset - 0.5) / nSamples;\\n' +\n 'float weight = 1.0 - abs(percent);\\n' +\n 'color += texture2D(uTexture, vTexCoord + uDelta * percent) * weight;\\n' +\n 'total += weight;\\n' +\n '}\\n' +\n 'gl_FragColor = color / total;\\n' +\n '}',\n /* eslint-enable max-len */\n\n /**\n * blur value, in percentage of image dimensions.\n * specific to keep the image blur constant at different resolutions\n * range bewteen 0 and 1.\n */\n blur: 0,\n\n mainParameter: 'blur',\n\n applyTo: function(options) {\n if (options.webgl) {\n // this aspectRatio is used to give the same blur to vertical and horizontal\n this.aspectRatio = options.sourceWidth / options.sourceHeight;\n options.passes++;\n this._setupFrameBuffer(options);\n this.horizontal = true;\n this.applyToWebGL(options);\n this._swapTextures(options);\n this._setupFrameBuffer(options);\n this.horizontal = false;\n this.applyToWebGL(options);\n this._swapTextures(options);\n }\n else {\n this.applyTo2d(options);\n }\n },\n\n applyTo2d: function(options) {\n // paint canvasEl with current image data.\n //options.ctx.putImageData(options.imageData, 0, 0);\n options.imageData = this.simpleBlur(options);\n },\n\n simpleBlur: function(options) {\n var resources = options.filterBackend.resources, canvas1, canvas2,\n width = options.imageData.width,\n height = options.imageData.height;\n\n if (!resources.blurLayer1) {\n resources.blurLayer1 = fabric.util.createCanvasElement();\n resources.blurLayer2 = fabric.util.createCanvasElement();\n }\n canvas1 = resources.blurLayer1;\n canvas2 = resources.blurLayer2;\n if (canvas1.width !== width || canvas1.height !== height) {\n canvas2.width = canvas1.width = width;\n canvas2.height = canvas1.height = height;\n }\n var ctx1 = canvas1.getContext('2d'),\n ctx2 = canvas2.getContext('2d'),\n nSamples = 15,\n random, percent, j, i,\n blur = this.blur * 0.06 * 0.5;\n\n // load first canvas\n ctx1.putImageData(options.imageData, 0, 0);\n ctx2.clearRect(0, 0, width, height);\n\n for (i = -nSamples; i <= nSamples; i++) {\n random = (Math.random() - 0.5) / 4;\n percent = i / nSamples;\n j = blur * percent * width + random;\n ctx2.globalAlpha = 1 - Math.abs(percent);\n ctx2.drawImage(canvas1, j, random);\n ctx1.drawImage(canvas2, 0, 0);\n ctx2.globalAlpha = 1;\n ctx2.clearRect(0, 0, canvas2.width, canvas2.height);\n }\n for (i = -nSamples; i <= nSamples; i++) {\n random = (Math.random() - 0.5) / 4;\n percent = i / nSamples;\n j = blur * percent * height + random;\n ctx2.globalAlpha = 1 - Math.abs(percent);\n ctx2.drawImage(canvas1, random, j);\n ctx1.drawImage(canvas2, 0, 0);\n ctx2.globalAlpha = 1;\n ctx2.clearRect(0, 0, canvas2.width, canvas2.height);\n }\n options.ctx.drawImage(canvas1, 0, 0);\n var newImageData = options.ctx.getImageData(0, 0, canvas1.width, canvas1.height);\n ctx1.globalAlpha = 1;\n ctx1.clearRect(0, 0, canvas1.width, canvas1.height);\n return newImageData;\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function(gl, program) {\n return {\n delta: gl.getUniformLocation(program, 'uDelta'),\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function(gl, uniformLocations) {\n var delta = this.chooseRightDelta();\n gl.uniform2fv(uniformLocations.delta, delta);\n },\n\n /**\n * choose right value of image percentage to blur with\n * @returns {Array} a numeric array with delta values\n */\n chooseRightDelta: function() {\n var blurScale = 1, delta = [0, 0], blur;\n if (this.horizontal) {\n if (this.aspectRatio > 1) {\n // image is wide, i want to shrink radius horizontal\n blurScale = 1 / this.aspectRatio;\n }\n }\n else {\n if (this.aspectRatio < 1) {\n // image is tall, i want to shrink radius vertical\n blurScale = this.aspectRatio;\n }\n }\n blur = blurScale * this.blur * 0.12;\n if (this.horizontal) {\n delta[0] = blur;\n }\n else {\n delta[1] = blur;\n }\n return delta;\n },\n });\n\n /**\n * Deserialize a JSON definition of a BlurFilter into a concrete instance.\n */\n filters.Blur.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }),\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n\n /**\n * Gamma filter class\n * @class fabric.Image.filters.Gamma\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link fabric.Image.filters.Gamma#initialize} for constructor definition\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @example\n * var filter = new fabric.Image.filters.Gamma({\n * gamma: [1, 0.5, 2.1]\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n */\n filters.Gamma = createClass(filters.BaseFilter, /** @lends fabric.Image.filters.Gamma.prototype */ {\n\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'Gamma',\n\n fragmentSource: 'precision highp float;\\n' +\n 'uniform sampler2D uTexture;\\n' +\n 'uniform vec3 uGamma;\\n' +\n 'varying vec2 vTexCoord;\\n' +\n 'void main() {\\n' +\n 'vec4 color = texture2D(uTexture, vTexCoord);\\n' +\n 'vec3 correction = (1.0 / uGamma);\\n' +\n 'color.r = pow(color.r, correction.r);\\n' +\n 'color.g = pow(color.g, correction.g);\\n' +\n 'color.b = pow(color.b, correction.b);\\n' +\n 'gl_FragColor = color;\\n' +\n 'gl_FragColor.rgb *= color.a;\\n' +\n '}',\n\n /**\n * Gamma array value, from 0.01 to 2.2.\n * @param {Array} gamma\n * @default\n */\n gamma: [1, 1, 1],\n\n /**\n * Describe the property that is the filter parameter\n * @param {String} m\n * @default\n */\n mainParameter: 'gamma',\n\n /**\n * Constructor\n * @param {Object} [options] Options object\n */\n initialize: function(options) {\n this.gamma = [1, 1, 1];\n filters.BaseFilter.prototype.initialize.call(this, options);\n },\n\n /**\n * Apply the Gamma operation to a Uint8Array representing the pixels of an image.\n *\n * @param {Object} options\n * @param {ImageData} options.imageData The Uint8Array to be filtered.\n */\n applyTo2d: function(options) {\n var imageData = options.imageData, data = imageData.data,\n gamma = this.gamma, len = data.length,\n rInv = 1 / gamma[0], gInv = 1 / gamma[1],\n bInv = 1 / gamma[2], i;\n\n if (!this.rVals) {\n // eslint-disable-next-line\n this.rVals = new Uint8Array(256);\n // eslint-disable-next-line\n this.gVals = new Uint8Array(256);\n // eslint-disable-next-line\n this.bVals = new Uint8Array(256);\n }\n\n // This is an optimization - pre-compute a look-up table for each color channel\n // instead of performing these pow calls for each pixel in the image.\n for (i = 0, len = 256; i < len; i++) {\n this.rVals[i] = Math.pow(i / 255, rInv) * 255;\n this.gVals[i] = Math.pow(i / 255, gInv) * 255;\n this.bVals[i] = Math.pow(i / 255, bInv) * 255;\n }\n for (i = 0, len = data.length; i < len; i += 4) {\n data[i] = this.rVals[data[i]];\n data[i + 1] = this.gVals[data[i + 1]];\n data[i + 2] = this.bVals[data[i + 2]];\n }\n },\n\n /**\n * Return WebGL uniform locations for this filter's shader.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {WebGLShaderProgram} program This filter's compiled shader program.\n */\n getUniformLocations: function(gl, program) {\n return {\n uGamma: gl.getUniformLocation(program, 'uGamma'),\n };\n },\n\n /**\n * Send data from this filter to its shader program's uniforms.\n *\n * @param {WebGLRenderingContext} gl The GL canvas context used to compile this filter's shader.\n * @param {Object} uniformLocations A map of string uniform names to WebGLUniformLocation objects\n */\n sendUniformData: function(gl, uniformLocations) {\n gl.uniform3fv(uniformLocations.uGamma, this.gamma);\n },\n });\n\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] to be invoked after filter creation\n * @return {fabric.Image.filters.Gamma} Instance of fabric.Image.filters.Gamma\n */\n fabric.Image.filters.Gamma.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }),\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n\n /**\n * A container class that knows how to apply a sequence of filters to an input image.\n */\n filters.Composed = createClass(filters.BaseFilter, /** @lends fabric.Image.filters.Composed.prototype */ {\n\n type: 'Composed',\n\n /**\n * A non sparse array of filters to apply\n */\n subFilters: [],\n\n /**\n * Constructor\n * @param {Object} [options] Options object\n */\n initialize: function(options) {\n this.callSuper('initialize', options);\n // create a new array instead mutating the prototype with push\n this.subFilters = this.subFilters.slice(0);\n },\n\n /**\n * Apply this container's filters to the input image provided.\n *\n * @param {Object} options\n * @param {Number} options.passes The number of filters remaining to be applied.\n */\n applyTo: function(options) {\n options.passes += this.subFilters.length - 1;\n this.subFilters.forEach(function(filter) {\n filter.applyTo(options);\n });\n },\n\n /**\n * Serialize this filter into JSON.\n *\n * @returns {Object} A JSON representation of this filter.\n */\n toObject: function() {\n return fabric.util.object.extend(this.callSuper('toObject'), {\n subFilters: this.subFilters.map(function(filter) { return filter.toObject(); }),\n });\n },\n\n isNeutralState: function() {\n return !this.subFilters.some(function(filter) { return !filter.isNeutralState(); });\n }\n });\n\n /**\n * Deserialize a JSON definition of a ComposedFilter into a concrete instance.\n */\n fabric.Image.filters.Composed.fromObject = function(object, callback) {\n var filters = object.subFilters || [],\n subFilters = filters.map(function(filter) {\n return new fabric.Image.filters[filter.type](filter);\n }),\n instance = new fabric.Image.filters.Composed({ subFilters: subFilters });\n callback && callback(instance);\n return instance;\n };\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }),\n filters = fabric.Image.filters,\n createClass = fabric.util.createClass;\n\n /**\n * HueRotation filter class\n * @class fabric.Image.filters.HueRotation\n * @memberOf fabric.Image.filters\n * @extends fabric.Image.filters.BaseFilter\n * @see {@link fabric.Image.filters.HueRotation#initialize} for constructor definition\n * @see {@link http://fabricjs.com/image-filters|ImageFilters demo}\n * @example\n * var filter = new fabric.Image.filters.HueRotation({\n * rotation: -0.5\n * });\n * object.filters.push(filter);\n * object.applyFilters();\n */\n filters.HueRotation = createClass(filters.ColorMatrix, /** @lends fabric.Image.filters.HueRotation.prototype */ {\n\n /**\n * Filter type\n * @param {String} type\n * @default\n */\n type: 'HueRotation',\n\n /**\n * HueRotation value, from -1 to 1.\n * the unit is radians\n * @param {Number} myParameter\n * @default\n */\n rotation: 0,\n\n /**\n * Describe the property that is the filter parameter\n * @param {String} m\n * @default\n */\n mainParameter: 'rotation',\n\n calculateMatrix: function() {\n var rad = this.rotation * Math.PI, cos = fabric.util.cos(rad), sin = fabric.util.sin(rad),\n aThird = 1 / 3, aThirdSqtSin = Math.sqrt(aThird) * sin, OneMinusCos = 1 - cos;\n this.matrix = [\n 1, 0, 0, 0, 0,\n 0, 1, 0, 0, 0,\n 0, 0, 1, 0, 0,\n 0, 0, 0, 1, 0\n ];\n this.matrix[0] = cos + OneMinusCos / 3;\n this.matrix[1] = aThird * OneMinusCos - aThirdSqtSin;\n this.matrix[2] = aThird * OneMinusCos + aThirdSqtSin;\n this.matrix[5] = aThird * OneMinusCos + aThirdSqtSin;\n this.matrix[6] = cos + aThird * OneMinusCos;\n this.matrix[7] = aThird * OneMinusCos - aThirdSqtSin;\n this.matrix[10] = aThird * OneMinusCos - aThirdSqtSin;\n this.matrix[11] = aThird * OneMinusCos + aThirdSqtSin;\n this.matrix[12] = cos + aThird * OneMinusCos;\n },\n\n /**\n * HueRotation isNeutralState implementation\n * Used only in image applyFilters to discard filters that will not have an effect\n * on the image\n * @param {Object} options\n **/\n isNeutralState: function(options) {\n this.calculateMatrix();\n return filters.BaseFilter.prototype.isNeutralState.call(this, options);\n },\n\n /**\n * Apply this filter to the input image data provided.\n *\n * Determines whether to use WebGL or Canvas2D based on the options.webgl flag.\n *\n * @param {Object} options\n * @param {Number} options.passes The number of filters remaining to be executed\n * @param {Boolean} options.webgl Whether to use webgl to render the filter.\n * @param {WebGLTexture} options.sourceTexture The texture setup as the source to be filtered.\n * @param {WebGLTexture} options.targetTexture The texture where filtered output should be drawn.\n * @param {WebGLRenderingContext} options.context The GL context used for rendering.\n * @param {Object} options.programCache A map of compiled shader programs, keyed by filter type.\n */\n applyTo: function(options) {\n this.calculateMatrix();\n filters.BaseFilter.prototype.applyTo.call(this, options);\n },\n\n });\n\n /**\n * Returns filter instance from an object representation\n * @static\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] to be invoked after filter creation\n * @return {fabric.Image.filters.HueRotation} Instance of fabric.Image.filters.HueRotation\n */\n fabric.Image.filters.HueRotation.fromObject = fabric.Image.filters.BaseFilter.fromObject;\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = { }),\n clone = fabric.util.object.clone;\n\n if (fabric.Text) {\n fabric.warn('fabric.Text is already defined');\n return;\n }\n\n /**\n * Text class\n * @class fabric.Text\n * @extends fabric.Object\n * @return {fabric.Text} thisArg\n * @tutorial {@link http://fabricjs.com/fabric-intro-part-2#text}\n * @see {@link fabric.Text#initialize} for constructor definition\n */\n fabric.Text = fabric.util.createClass(fabric.Object, /** @lends fabric.Text.prototype */ {\n\n /**\n * Properties which when set cause object to change dimensions\n * @type Array\n * @private\n */\n _dimensionAffectingProps: [\n 'fontSize',\n 'fontWeight',\n 'fontFamily',\n 'fontStyle',\n 'lineHeight',\n 'text',\n 'charSpacing',\n 'textAlign',\n 'styles',\n ],\n\n /**\n * @private\n */\n _reNewline: /\\r?\\n/,\n\n /**\n * Use this regular expression to filter for whitespaces that is not a new line.\n * Mostly used when text is 'justify' aligned.\n * @private\n */\n _reSpacesAndTabs: /[ \\t\\r]/g,\n\n /**\n * Use this regular expression to filter for whitespace that is not a new line.\n * Mostly used when text is 'justify' aligned.\n * @private\n */\n _reSpaceAndTab: /[ \\t\\r]/,\n\n /**\n * Use this regular expression to filter consecutive groups of non spaces.\n * Mostly used when text is 'justify' aligned.\n * @private\n */\n _reWords: /\\S+/g,\n\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'text',\n\n /**\n * Font size (in pixels)\n * @type Number\n * @default\n */\n fontSize: 40,\n\n /**\n * Font weight (e.g. bold, normal, 400, 600, 800)\n * @type {(Number|String)}\n * @default\n */\n fontWeight: 'normal',\n\n /**\n * Font family\n * @type String\n * @default\n */\n fontFamily: 'Times New Roman',\n\n /**\n * Text decoration underline.\n * @type Boolean\n * @default\n */\n underline: false,\n\n /**\n * Text decoration overline.\n * @type Boolean\n * @default\n */\n overline: false,\n\n /**\n * Text decoration linethrough.\n * @type Boolean\n * @default\n */\n linethrough: false,\n\n /**\n * Text alignment. Possible values: \"left\", \"center\", \"right\", \"justify\",\n * \"justify-left\", \"justify-center\" or \"justify-right\".\n * @type String\n * @default\n */\n textAlign: 'left',\n\n /**\n * Font style . Possible values: \"\", \"normal\", \"italic\" or \"oblique\".\n * @type String\n * @default\n */\n fontStyle: 'normal',\n\n /**\n * Line height\n * @type Number\n * @default\n */\n lineHeight: 1.16,\n\n /**\n * Superscript schema object (minimum overlap)\n * @type {Object}\n * @default\n */\n superscript: {\n size: 0.60, // fontSize factor\n baseline: -0.35 // baseline-shift factor (upwards)\n },\n\n /**\n * Subscript schema object (minimum overlap)\n * @type {Object}\n * @default\n */\n subscript: {\n size: 0.60, // fontSize factor\n baseline: 0.11 // baseline-shift factor (downwards)\n },\n\n /**\n * Background color of text lines\n * @type String\n * @default\n */\n textBackgroundColor: '',\n\n /**\n * List of properties to consider when checking if\n * state of an object is changed ({@link fabric.Object#hasStateChanged})\n * as well as for history (undo/redo) purposes\n * @type Array\n */\n stateProperties: fabric.Object.prototype.stateProperties.concat('fontFamily',\n 'fontWeight',\n 'fontSize',\n 'text',\n 'underline',\n 'overline',\n 'linethrough',\n 'textAlign',\n 'fontStyle',\n 'lineHeight',\n 'textBackgroundColor',\n 'charSpacing',\n 'styles'),\n\n /**\n * List of properties to consider when checking if cache needs refresh\n * @type Array\n */\n cacheProperties: fabric.Object.prototype.cacheProperties.concat('fontFamily',\n 'fontWeight',\n 'fontSize',\n 'text',\n 'underline',\n 'overline',\n 'linethrough',\n 'textAlign',\n 'fontStyle',\n 'lineHeight',\n 'textBackgroundColor',\n 'charSpacing',\n 'styles'),\n\n /**\n * When defined, an object is rendered via stroke and this property specifies its color.\n * <b>Backwards incompatibility note:</b> This property was named \"strokeStyle\" until v1.1.6\n * @type String\n * @default\n */\n stroke: null,\n\n /**\n * Shadow object representing shadow of this shape.\n * <b>Backwards incompatibility note:</b> This property was named \"textShadow\" (String) until v1.2.11\n * @type fabric.Shadow\n * @default\n */\n shadow: null,\n\n /**\n * @private\n */\n _fontSizeFraction: 0.222,\n\n /**\n * @private\n */\n offsets: {\n underline: 0.10,\n linethrough: -0.315,\n overline: -0.88\n },\n\n /**\n * Text Line proportion to font Size (in pixels)\n * @type Number\n * @default\n */\n _fontSizeMult: 1.13,\n\n /**\n * additional space between characters\n * expressed in thousands of em unit\n * @type Number\n * @default\n */\n charSpacing: 0,\n\n /**\n * Object containing character styles - top-level properties -> line numbers,\n * 2nd-level properties - charater numbers\n * @type Object\n * @default\n */\n styles: null,\n\n /**\n * Reference to a context to measure text char or couple of chars\n * the cacheContext of the canvas will be used or a freshly created one if the object is not on canvas\n * once created it will be referenced on fabric._measuringContext to avoide creating a canvas for every\n * text object created.\n * @type {CanvasRenderingContext2D}\n * @default\n */\n _measuringContext: null,\n\n /**\n * Baseline shift, stlyes only, keep at 0 for the main text object\n * @type {Number}\n * @default\n */\n deltaY: 0,\n\n /**\n * Array of properties that define a style unit (of 'styles').\n * @type {Array}\n * @default\n */\n _styleProperties: [\n 'stroke',\n 'strokeWidth',\n 'fill',\n 'fontFamily',\n 'fontSize',\n 'fontWeight',\n 'fontStyle',\n 'underline',\n 'overline',\n 'linethrough',\n 'deltaY',\n 'textBackgroundColor',\n ],\n\n /**\n * contains characters bounding boxes\n */\n __charBounds: [],\n\n /**\n * use this size when measuring text. To avoid IE11 rounding errors\n * @type {Number}\n * @default\n * @readonly\n * @private\n */\n CACHE_FONT_SIZE: 400,\n\n /**\n * contains the min text width to avoid getting 0\n * @type {Number}\n * @default\n */\n MIN_TEXT_WIDTH: 2,\n\n /**\n * Constructor\n * @param {String} text Text string\n * @param {Object} [options] Options object\n * @return {fabric.Text} thisArg\n */\n initialize: function(text, options) {\n this.styles = options ? (options.styles || { }) : { };\n this.text = text;\n this.__skipDimension = true;\n this.callSuper('initialize', options);\n this.__skipDimension = false;\n this.initDimensions();\n this.setCoords();\n this.setupState({ propertySet: '_dimensionAffectingProps' });\n },\n\n /**\n * Return a contex for measurement of text string.\n * if created it gets stored for reuse\n * @param {String} text Text string\n * @param {Object} [options] Options object\n * @return {fabric.Text} thisArg\n */\n getMeasuringContext: function() {\n // if we did not return we have to measure something.\n if (!fabric._measuringContext) {\n fabric._measuringContext = this.canvas && this.canvas.contextCache ||\n fabric.util.createCanvasElement().getContext('2d');\n }\n return fabric._measuringContext;\n },\n\n /**\n * @private\n * Divides text into lines of text and lines of graphemes.\n */\n _splitText: function() {\n var newLines = this._splitTextIntoLines(this.text);\n this.textLines = newLines.lines;\n this._textLines = newLines.graphemeLines;\n this._unwrappedTextLines = newLines._unwrappedLines;\n this._text = newLines.graphemeText;\n return newLines;\n },\n\n /**\n * Initialize or update text dimensions.\n * Updates this.width and this.height with the proper values.\n * Does not return dimensions.\n */\n initDimensions: function() {\n if (this.__skipDimension) {\n return;\n }\n this._splitText();\n this._clearCache();\n this.width = this.calcTextWidth() || this.cursorWidth || this.MIN_TEXT_WIDTH;\n if (this.textAlign.indexOf('justify') !== -1) {\n // once text is measured we need to make space fatter to make justified text.\n this.enlargeSpaces();\n }\n this.height = this.calcTextHeight();\n this.saveState({ propertySet: '_dimensionAffectingProps' });\n },\n\n /**\n * Enlarge space boxes and shift the others\n */\n enlargeSpaces: function() {\n var diffSpace, currentLineWidth, numberOfSpaces, accumulatedSpace, line, charBound, spaces;\n for (var i = 0, len = this._textLines.length; i < len; i++) {\n if (this.textAlign !== 'justify' && (i === len - 1 || this.isEndOfWrapping(i))) {\n continue;\n }\n accumulatedSpace = 0;\n line = this._textLines[i];\n currentLineWidth = this.getLineWidth(i);\n if (currentLineWidth < this.width && (spaces = this.textLines[i].match(this._reSpacesAndTabs))) {\n numberOfSpaces = spaces.length;\n diffSpace = (this.width - currentLineWidth) / numberOfSpaces;\n for (var j = 0, jlen = line.length; j <= jlen; j++) {\n charBound = this.__charBounds[i][j];\n if (this._reSpaceAndTab.test(line[j])) {\n charBound.width += diffSpace;\n charBound.kernedWidth += diffSpace;\n charBound.left += accumulatedSpace;\n accumulatedSpace += diffSpace;\n }\n else {\n charBound.left += accumulatedSpace;\n }\n }\n }\n }\n },\n\n /**\n * Detect if the text line is ended with an hard break\n * text and itext do not have wrapping, return false\n * @return {Boolean}\n */\n isEndOfWrapping: function(lineIndex) {\n return lineIndex === this._textLines.length - 1;\n },\n\n /**\n * Detect if a line has a linebreak and so we need to account for it when moving\n * and counting style.\n * It return always for text and Itext.\n * @return Number\n */\n missingNewlineOffset: function() {\n return 1;\n },\n\n /**\n * Returns string representation of an instance\n * @return {String} String representation of text object\n */\n toString: function() {\n return '#<fabric.Text (' + this.complexity() +\n '): { \"text\": \"' + this.text + '\", \"fontFamily\": \"' + this.fontFamily + '\" }>';\n },\n\n /**\n * Return the dimension and the zoom level needed to create a cache canvas\n * big enough to host the object to be cached.\n * @private\n * @param {Object} dim.x width of object to be cached\n * @param {Object} dim.y height of object to be cached\n * @return {Object}.width width of canvas\n * @return {Object}.height height of canvas\n * @return {Object}.zoomX zoomX zoom value to unscale the canvas before drawing cache\n * @return {Object}.zoomY zoomY zoom value to unscale the canvas before drawing cache\n */\n _getCacheCanvasDimensions: function() {\n var dims = this.callSuper('_getCacheCanvasDimensions');\n var fontSize = this.fontSize;\n dims.width += fontSize * dims.zoomX;\n dims.height += fontSize * dims.zoomY;\n return dims;\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _render: function(ctx) {\n this._setTextStyles(ctx);\n this._renderTextLinesBackground(ctx);\n this._renderTextDecoration(ctx, 'underline');\n this._renderText(ctx);\n this._renderTextDecoration(ctx, 'overline');\n this._renderTextDecoration(ctx, 'linethrough');\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderText: function(ctx) {\n if (this.paintFirst === 'stroke') {\n this._renderTextStroke(ctx);\n this._renderTextFill(ctx);\n }\n else {\n this._renderTextFill(ctx);\n this._renderTextStroke(ctx);\n }\n },\n\n /**\n * Set the font parameter of the context with the object properties or with charStyle\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n * @param {Object} [charStyle] object with font style properties\n * @param {String} [charStyle.fontFamily] Font Family\n * @param {Number} [charStyle.fontSize] Font size in pixels. ( without px suffix )\n * @param {String} [charStyle.fontWeight] Font weight\n * @param {String} [charStyle.fontStyle] Font style (italic|normal)\n */\n _setTextStyles: function(ctx, charStyle, forMeasuring) {\n ctx.textBaseline = 'alphabetic';\n ctx.font = this._getFontDeclaration(charStyle, forMeasuring);\n },\n\n /**\n * calculate and return the text Width measuring each line.\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n * @return {Number} Maximum width of fabric.Text object\n */\n calcTextWidth: function() {\n var maxWidth = this.getLineWidth(0);\n\n for (var i = 1, len = this._textLines.length; i < len; i++) {\n var currentLineWidth = this.getLineWidth(i);\n if (currentLineWidth > maxWidth) {\n maxWidth = currentLineWidth;\n }\n }\n return maxWidth;\n },\n\n /**\n * @private\n * @param {String} method Method name (\"fillText\" or \"strokeText\")\n * @param {CanvasRenderingContext2D} ctx Context to render on\n * @param {String} line Text to render\n * @param {Number} left Left position of text\n * @param {Number} top Top position of text\n * @param {Number} lineIndex Index of a line in a text\n */\n _renderTextLine: function(method, ctx, line, left, top, lineIndex) {\n this._renderChars(method, ctx, line, left, top, lineIndex);\n },\n\n /**\n * Renders the text background for lines, taking care of style\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderTextLinesBackground: function(ctx) {\n if (!this.textBackgroundColor && !this.styleHas('textBackgroundColor')) {\n return;\n }\n var lineTopOffset = 0, heightOfLine,\n lineLeftOffset, originalFill = ctx.fillStyle,\n line, lastColor,\n leftOffset = this._getLeftOffset(),\n topOffset = this._getTopOffset(),\n boxStart = 0, boxWidth = 0, charBox, currentColor;\n\n for (var i = 0, len = this._textLines.length; i < len; i++) {\n heightOfLine = this.getHeightOfLine(i);\n if (!this.textBackgroundColor && !this.styleHas('textBackgroundColor', i)) {\n lineTopOffset += heightOfLine;\n continue;\n }\n line = this._textLines[i];\n lineLeftOffset = this._getLineLeftOffset(i);\n boxWidth = 0;\n boxStart = 0;\n lastColor = this.getValueOfPropertyAt(i, 0, 'textBackgroundColor');\n for (var j = 0, jlen = line.length; j < jlen; j++) {\n charBox = this.__charBounds[i][j];\n currentColor = this.getValueOfPropertyAt(i, j, 'textBackgroundColor');\n if (currentColor !== lastColor) {\n ctx.fillStyle = lastColor;\n lastColor && ctx.fillRect(\n leftOffset + lineLeftOffset + boxStart,\n topOffset + lineTopOffset,\n boxWidth,\n heightOfLine / this.lineHeight\n );\n boxStart = charBox.left;\n boxWidth = charBox.width;\n lastColor = currentColor;\n }\n else {\n boxWidth += charBox.kernedWidth;\n }\n }\n if (currentColor) {\n ctx.fillStyle = currentColor;\n ctx.fillRect(\n leftOffset + lineLeftOffset + boxStart,\n topOffset + lineTopOffset,\n boxWidth,\n heightOfLine / this.lineHeight\n );\n }\n lineTopOffset += heightOfLine;\n }\n ctx.fillStyle = originalFill;\n // if there is text background color no\n // other shadows should be casted\n this._removeShadow(ctx);\n },\n\n /**\n * @private\n * @param {Object} decl style declaration for cache\n * @param {String} decl.fontFamily fontFamily\n * @param {String} decl.fontStyle fontStyle\n * @param {String} decl.fontWeight fontWeight\n * @return {Object} reference to cache\n */\n getFontCache: function(decl) {\n var fontFamily = decl.fontFamily.toLowerCase();\n if (!fabric.charWidthsCache[fontFamily]) {\n fabric.charWidthsCache[fontFamily] = { };\n }\n var cache = fabric.charWidthsCache[fontFamily],\n cacheProp = decl.fontStyle.toLowerCase() + '_' + (decl.fontWeight + '').toLowerCase();\n if (!cache[cacheProp]) {\n cache[cacheProp] = { };\n }\n return cache[cacheProp];\n },\n\n /**\n * apply all the character style to canvas for rendering\n * @private\n * @param {String} _char\n * @param {Number} lineIndex\n * @param {Number} charIndex\n * @param {Object} [decl]\n */\n _applyCharStyles: function(method, ctx, lineIndex, charIndex, styleDeclaration) {\n\n this._setFillStyles(ctx, styleDeclaration);\n this._setStrokeStyles(ctx, styleDeclaration);\n\n ctx.font = this._getFontDeclaration(styleDeclaration);\n },\n\n /**\n * measure and return the width of a single character.\n * possibly overridden to accommodate different measure logic or\n * to hook some external lib for character measurement\n * @private\n * @param {String} _char, char to be measured\n * @param {Object} charStyle style of char to be measured\n * @param {String} [previousChar] previous char\n * @param {Object} [prevCharStyle] style of previous char\n */\n _measureChar: function(_char, charStyle, previousChar, prevCharStyle) {\n // first i try to return from cache\n var fontCache = this.getFontCache(charStyle), fontDeclaration = this._getFontDeclaration(charStyle),\n previousFontDeclaration = this._getFontDeclaration(prevCharStyle), couple = previousChar + _char,\n stylesAreEqual = fontDeclaration === previousFontDeclaration, width, coupleWidth, previousWidth,\n fontMultiplier = charStyle.fontSize / this.CACHE_FONT_SIZE, kernedWidth;\n\n if (previousChar && fontCache[previousChar] !== undefined) {\n previousWidth = fontCache[previousChar];\n }\n if (fontCache[_char] !== undefined) {\n kernedWidth = width = fontCache[_char];\n }\n if (stylesAreEqual && fontCache[couple] !== undefined) {\n coupleWidth = fontCache[couple];\n kernedWidth = coupleWidth - previousWidth;\n }\n if (width === undefined || previousWidth === undefined || coupleWidth === undefined) {\n var ctx = this.getMeasuringContext();\n // send a TRUE to specify measuring font size CACHE_FONT_SIZE\n this._setTextStyles(ctx, charStyle, true);\n }\n if (width === undefined) {\n kernedWidth = width = ctx.measureText(_char).width;\n fontCache[_char] = width;\n }\n if (previousWidth === undefined && stylesAreEqual && previousChar) {\n previousWidth = ctx.measureText(previousChar).width;\n fontCache[previousChar] = previousWidth;\n }\n if (stylesAreEqual && coupleWidth === undefined) {\n // we can measure the kerning couple and subtract the width of the previous character\n coupleWidth = ctx.measureText(couple).width;\n fontCache[couple] = coupleWidth;\n kernedWidth = coupleWidth - previousWidth;\n }\n return { width: width * fontMultiplier, kernedWidth: kernedWidth * fontMultiplier };\n },\n\n /**\n * Computes height of character at given position\n * @param {Number} line the line index number\n * @param {Number} _char the character index number\n * @return {Number} fontSize of the character\n */\n getHeightOfChar: function(line, _char) {\n return this.getValueOfPropertyAt(line, _char, 'fontSize');\n },\n\n /**\n * measure a text line measuring all characters.\n * @param {Number} lineIndex line number\n * @return {Number} Line width\n */\n measureLine: function(lineIndex) {\n var lineInfo = this._measureLine(lineIndex);\n if (this.charSpacing !== 0) {\n lineInfo.width -= this._getWidthOfCharSpacing();\n }\n if (lineInfo.width < 0) {\n lineInfo.width = 0;\n }\n return lineInfo;\n },\n\n /**\n * measure every grapheme of a line, populating __charBounds\n * @param {Number} lineIndex\n * @return {Object} object.width total width of characters\n * @return {Object} object.widthOfSpaces length of chars that match this._reSpacesAndTabs\n */\n _measureLine: function(lineIndex) {\n var width = 0, i, grapheme, line = this._textLines[lineIndex], prevGrapheme,\n graphemeInfo, numOfSpaces = 0, lineBounds = new Array(line.length);\n\n this.__charBounds[lineIndex] = lineBounds;\n for (i = 0; i < line.length; i++) {\n grapheme = line[i];\n graphemeInfo = this._getGraphemeBox(grapheme, lineIndex, i, prevGrapheme);\n lineBounds[i] = graphemeInfo;\n width += graphemeInfo.kernedWidth;\n prevGrapheme = grapheme;\n }\n // this latest bound box represent the last character of the line\n // to simplify cursor handling in interactive mode.\n lineBounds[i] = {\n left: graphemeInfo ? graphemeInfo.left + graphemeInfo.width : 0,\n width: 0,\n kernedWidth: 0,\n height: this.fontSize\n };\n return { width: width, numOfSpaces: numOfSpaces };\n },\n\n /**\n * Measure and return the info of a single grapheme.\n * needs the the info of previous graphemes already filled\n * @private\n * @param {String} grapheme to be measured\n * @param {Number} lineIndex index of the line where the char is\n * @param {Number} charIndex position in the line\n * @param {String} [prevGrapheme] character preceding the one to be measured\n */\n _getGraphemeBox: function(grapheme, lineIndex, charIndex, prevGrapheme, skipLeft) {\n var style = this.getCompleteStyleDeclaration(lineIndex, charIndex),\n prevStyle = prevGrapheme ? this.getCompleteStyleDeclaration(lineIndex, charIndex - 1) : { },\n info = this._measureChar(grapheme, style, prevGrapheme, prevStyle),\n kernedWidth = info.kernedWidth,\n width = info.width, charSpacing;\n\n if (this.charSpacing !== 0) {\n charSpacing = this._getWidthOfCharSpacing();\n width += charSpacing;\n kernedWidth += charSpacing;\n }\n\n var box = {\n width: width,\n left: 0,\n height: style.fontSize,\n kernedWidth: kernedWidth,\n deltaY: style.deltaY,\n };\n if (charIndex > 0 && !skipLeft) {\n var previousBox = this.__charBounds[lineIndex][charIndex - 1];\n box.left = previousBox.left + previousBox.width + info.kernedWidth - info.width;\n }\n return box;\n },\n\n /**\n * Calculate height of line at 'lineIndex'\n * @param {Number} lineIndex index of line to calculate\n * @return {Number}\n */\n getHeightOfLine: function(lineIndex) {\n if (this.__lineHeights[lineIndex]) {\n return this.__lineHeights[lineIndex];\n }\n\n var line = this._textLines[lineIndex],\n // char 0 is measured before the line cycle because it nneds to char\n // emptylines\n maxHeight = this.getHeightOfChar(lineIndex, 0);\n for (var i = 1, len = line.length; i < len; i++) {\n maxHeight = Math.max(this.getHeightOfChar(lineIndex, i), maxHeight);\n }\n\n return this.__lineHeights[lineIndex] = maxHeight * this.lineHeight * this._fontSizeMult;\n },\n\n /**\n * Calculate text box height\n */\n calcTextHeight: function() {\n var lineHeight, height = 0;\n for (var i = 0, len = this._textLines.length; i < len; i++) {\n lineHeight = this.getHeightOfLine(i);\n height += (i === len - 1 ? lineHeight / this.lineHeight : lineHeight);\n }\n return height;\n },\n\n /**\n * @private\n * @return {Number} Left offset\n */\n _getLeftOffset: function() {\n return -this.width / 2;\n },\n\n /**\n * @private\n * @return {Number} Top offset\n */\n _getTopOffset: function() {\n return -this.height / 2;\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n * @param {String} method Method name (\"fillText\" or \"strokeText\")\n */\n _renderTextCommon: function(ctx, method) {\n ctx.save();\n var lineHeights = 0, left = this._getLeftOffset(), top = this._getTopOffset(),\n offsets = this._applyPatternGradientTransform(ctx, method === 'fillText' ? this.fill : this.stroke);\n for (var i = 0, len = this._textLines.length; i < len; i++) {\n var heightOfLine = this.getHeightOfLine(i),\n maxHeight = heightOfLine / this.lineHeight,\n leftOffset = this._getLineLeftOffset(i);\n this._renderTextLine(\n method,\n ctx,\n this._textLines[i],\n left + leftOffset - offsets.offsetX,\n top + lineHeights + maxHeight - offsets.offsetY,\n i\n );\n lineHeights += heightOfLine;\n }\n ctx.restore();\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderTextFill: function(ctx) {\n if (!this.fill && !this.styleHas('fill')) {\n return;\n }\n\n this._renderTextCommon(ctx, 'fillText');\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderTextStroke: function(ctx) {\n if ((!this.stroke || this.strokeWidth === 0) && this.isEmptyStyles()) {\n return;\n }\n\n if (this.shadow && !this.shadow.affectStroke) {\n this._removeShadow(ctx);\n }\n\n ctx.save();\n this._setLineDash(ctx, this.strokeDashArray);\n ctx.beginPath();\n this._renderTextCommon(ctx, 'strokeText');\n ctx.closePath();\n ctx.restore();\n },\n\n /**\n * @private\n * @param {String} method fillText or strokeText.\n * @param {CanvasRenderingContext2D} ctx Context to render on\n * @param {Array} line Content of the line, splitted in an array by grapheme\n * @param {Number} left\n * @param {Number} top\n * @param {Number} lineIndex\n */\n _renderChars: function(method, ctx, line, left, top, lineIndex) {\n // set proper line offset\n var lineHeight = this.getHeightOfLine(lineIndex),\n isJustify = this.textAlign.indexOf('justify') !== -1,\n actualStyle,\n nextStyle,\n charsToRender = '',\n charBox,\n boxWidth = 0,\n timeToRender,\n shortCut = !isJustify && this.charSpacing === 0 && this.isEmptyStyles(lineIndex);\n\n ctx.save();\n top -= lineHeight * this._fontSizeFraction / this.lineHeight;\n if (shortCut) {\n // render all the line in one pass without checking\n this._renderChar(method, ctx, lineIndex, 0, line.join(''), left, top, lineHeight);\n ctx.restore();\n return;\n }\n for (var i = 0, len = line.length - 1; i <= len; i++) {\n timeToRender = i === len || this.charSpacing;\n charsToRender += line[i];\n charBox = this.__charBounds[lineIndex][i];\n if (boxWidth === 0) {\n left += charBox.kernedWidth - charBox.width;\n boxWidth += charBox.width;\n }\n else {\n boxWidth += charBox.kernedWidth;\n }\n if (isJustify && !timeToRender) {\n if (this._reSpaceAndTab.test(line[i])) {\n timeToRender = true;\n }\n }\n if (!timeToRender) {\n // if we have charSpacing, we render char by char\n actualStyle = actualStyle || this.getCompleteStyleDeclaration(lineIndex, i);\n nextStyle = this.getCompleteStyleDeclaration(lineIndex, i + 1);\n timeToRender = this._hasStyleChanged(actualStyle, nextStyle);\n }\n if (timeToRender) {\n this._renderChar(method, ctx, lineIndex, i, charsToRender, left, top, lineHeight);\n charsToRender = '';\n actualStyle = nextStyle;\n left += boxWidth;\n boxWidth = 0;\n }\n }\n ctx.restore();\n },\n\n /**\n * @private\n * @param {String} method\n * @param {CanvasRenderingContext2D} ctx Context to render on\n * @param {Number} lineIndex\n * @param {Number} charIndex\n * @param {String} _char\n * @param {Number} left Left coordinate\n * @param {Number} top Top coordinate\n * @param {Number} lineHeight Height of the line\n */\n _renderChar: function(method, ctx, lineIndex, charIndex, _char, left, top) {\n var decl = this._getStyleDeclaration(lineIndex, charIndex),\n fullDecl = this.getCompleteStyleDeclaration(lineIndex, charIndex),\n shouldFill = method === 'fillText' && fullDecl.fill,\n shouldStroke = method === 'strokeText' && fullDecl.stroke && fullDecl.strokeWidth;\n\n if (!shouldStroke && !shouldFill) {\n return;\n }\n decl && ctx.save();\n\n this._applyCharStyles(method, ctx, lineIndex, charIndex, fullDecl);\n\n if (decl && decl.textBackgroundColor) {\n this._removeShadow(ctx);\n }\n if (decl && decl.deltaY) {\n top += decl.deltaY;\n }\n\n shouldFill && ctx.fillText(_char, left, top);\n shouldStroke && ctx.strokeText(_char, left, top);\n decl && ctx.restore();\n },\n\n /**\n * Turns the character into a 'superior figure' (i.e. 'superscript')\n * @param {Number} start selection start\n * @param {Number} end selection end\n * @returns {fabric.Text} thisArg\n * @chainable\n */\n setSuperscript: function(start, end) {\n return this._setScript(start, end, this.superscript);\n },\n\n /**\n * Turns the character into an 'inferior figure' (i.e. 'subscript')\n * @param {Number} start selection start\n * @param {Number} end selection end\n * @returns {fabric.Text} thisArg\n * @chainable\n */\n setSubscript: function(start, end) {\n return this._setScript(start, end, this.subscript);\n },\n\n /**\n * Applies 'schema' at given position\n * @private\n * @param {Number} start selection start\n * @param {Number} end selection end\n * @param {Number} schema\n * @returns {fabric.Text} thisArg\n * @chainable\n */\n _setScript: function(start, end, schema) {\n var loc = this.get2DCursorLocation(start, true),\n fontSize = this.getValueOfPropertyAt(loc.lineIndex, loc.charIndex, 'fontSize'),\n dy = this.getValueOfPropertyAt(loc.lineIndex, loc.charIndex, 'deltaY'),\n style = { fontSize: fontSize * schema.size, deltaY: dy + fontSize * schema.baseline };\n this.setSelectionStyles(style, start, end);\n return this;\n },\n\n /**\n * @private\n * @param {Object} prevStyle\n * @param {Object} thisStyle\n */\n _hasStyleChanged: function(prevStyle, thisStyle) {\n return prevStyle.fill !== thisStyle.fill ||\n prevStyle.stroke !== thisStyle.stroke ||\n prevStyle.strokeWidth !== thisStyle.strokeWidth ||\n prevStyle.fontSize !== thisStyle.fontSize ||\n prevStyle.fontFamily !== thisStyle.fontFamily ||\n prevStyle.fontWeight !== thisStyle.fontWeight ||\n prevStyle.fontStyle !== thisStyle.fontStyle ||\n prevStyle.deltaY !== thisStyle.deltaY;\n },\n\n /**\n * @private\n * @param {Object} prevStyle\n * @param {Object} thisStyle\n */\n _hasStyleChangedForSvg: function(prevStyle, thisStyle) {\n return this._hasStyleChanged(prevStyle, thisStyle) ||\n prevStyle.overline !== thisStyle.overline ||\n prevStyle.underline !== thisStyle.underline ||\n prevStyle.linethrough !== thisStyle.linethrough;\n },\n\n /**\n * @private\n * @param {Number} lineIndex index text line\n * @return {Number} Line left offset\n */\n _getLineLeftOffset: function(lineIndex) {\n var lineWidth = this.getLineWidth(lineIndex);\n if (this.textAlign === 'center') {\n return (this.width - lineWidth) / 2;\n }\n if (this.textAlign === 'right') {\n return this.width - lineWidth;\n }\n if (this.textAlign === 'justify-center' && this.isEndOfWrapping(lineIndex)) {\n return (this.width - lineWidth) / 2;\n }\n if (this.textAlign === 'justify-right' && this.isEndOfWrapping(lineIndex)) {\n return this.width - lineWidth;\n }\n return 0;\n },\n\n /**\n * @private\n */\n _clearCache: function() {\n this.__lineWidths = [];\n this.__lineHeights = [];\n this.__charBounds = [];\n },\n\n /**\n * @private\n */\n _shouldClearDimensionCache: function() {\n var shouldClear = this._forceClearCache;\n shouldClear || (shouldClear = this.hasStateChanged('_dimensionAffectingProps'));\n if (shouldClear) {\n this.dirty = true;\n this._forceClearCache = false;\n }\n return shouldClear;\n },\n\n /**\n * Measure a single line given its index. Used to calculate the initial\n * text bounding box. The values are calculated and stored in __lineWidths cache.\n * @private\n * @param {Number} lineIndex line number\n * @return {Number} Line width\n */\n getLineWidth: function(lineIndex) {\n if (this.__lineWidths[lineIndex]) {\n return this.__lineWidths[lineIndex];\n }\n\n var width, line = this._textLines[lineIndex], lineInfo;\n\n if (line === '') {\n width = 0;\n }\n else {\n lineInfo = this.measureLine(lineIndex);\n width = lineInfo.width;\n }\n this.__lineWidths[lineIndex] = width;\n return width;\n },\n\n _getWidthOfCharSpacing: function() {\n if (this.charSpacing !== 0) {\n return this.fontSize * this.charSpacing / 1000;\n }\n return 0;\n },\n\n /**\n * Retrieves the value of property at given character position\n * @param {Number} lineIndex the line number\n * @param {Number} charIndex the charater number\n * @param {String} property the property name\n * @returns the value of 'property'\n */\n getValueOfPropertyAt: function(lineIndex, charIndex, property) {\n var charStyle = this._getStyleDeclaration(lineIndex, charIndex);\n if (charStyle && typeof charStyle[property] !== 'undefined') {\n return charStyle[property];\n }\n return this[property];\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _renderTextDecoration: function(ctx, type) {\n if (!this[type] && !this.styleHas(type)) {\n return;\n }\n var heightOfLine, size, _size,\n lineLeftOffset, dy, _dy,\n line, lastDecoration,\n leftOffset = this._getLeftOffset(),\n topOffset = this._getTopOffset(), top,\n boxStart, boxWidth, charBox, currentDecoration,\n maxHeight, currentFill, lastFill,\n charSpacing = this._getWidthOfCharSpacing();\n\n for (var i = 0, len = this._textLines.length; i < len; i++) {\n heightOfLine = this.getHeightOfLine(i);\n if (!this[type] && !this.styleHas(type, i)) {\n topOffset += heightOfLine;\n continue;\n }\n line = this._textLines[i];\n maxHeight = heightOfLine / this.lineHeight;\n lineLeftOffset = this._getLineLeftOffset(i);\n boxStart = 0;\n boxWidth = 0;\n lastDecoration = this.getValueOfPropertyAt(i, 0, type);\n lastFill = this.getValueOfPropertyAt(i, 0, 'fill');\n top = topOffset + maxHeight * (1 - this._fontSizeFraction);\n size = this.getHeightOfChar(i, 0);\n dy = this.getValueOfPropertyAt(i, 0, 'deltaY');\n for (var j = 0, jlen = line.length; j < jlen; j++) {\n charBox = this.__charBounds[i][j];\n currentDecoration = this.getValueOfPropertyAt(i, j, type);\n currentFill = this.getValueOfPropertyAt(i, j, 'fill');\n _size = this.getHeightOfChar(i, j);\n _dy = this.getValueOfPropertyAt(i, j, 'deltaY');\n if ((currentDecoration !== lastDecoration || currentFill !== lastFill || _size !== size || _dy !== dy) &&\n boxWidth > 0) {\n ctx.fillStyle = lastFill;\n lastDecoration && lastFill && ctx.fillRect(\n leftOffset + lineLeftOffset + boxStart,\n top + this.offsets[type] * size + dy,\n boxWidth,\n this.fontSize / 15\n );\n boxStart = charBox.left;\n boxWidth = charBox.width;\n lastDecoration = currentDecoration;\n lastFill = currentFill;\n size = _size;\n dy = _dy;\n }\n else {\n boxWidth += charBox.kernedWidth;\n }\n }\n ctx.fillStyle = currentFill;\n currentDecoration && currentFill && ctx.fillRect(\n leftOffset + lineLeftOffset + boxStart,\n top + this.offsets[type] * size + dy,\n boxWidth - charSpacing,\n this.fontSize / 15\n );\n topOffset += heightOfLine;\n }\n // if there is text background color no\n // other shadows should be casted\n this._removeShadow(ctx);\n },\n\n /**\n * return font declaration string for canvas context\n * @param {Object} [styleObject] object\n * @returns {String} font declaration formatted for canvas context.\n */\n _getFontDeclaration: function(styleObject, forMeasuring) {\n var style = styleObject || this, family = this.fontFamily,\n fontIsGeneric = fabric.Text.genericFonts.indexOf(family.toLowerCase()) > -1;\n var fontFamily = family === undefined ||\n family.indexOf('\\'') > -1 || family.indexOf(',') > -1 ||\n family.indexOf('\"') > -1 || fontIsGeneric\n ? style.fontFamily : '\"' + style.fontFamily + '\"';\n return [\n // node-canvas needs \"weight style\", while browsers need \"style weight\"\n // verify if this can be fixed in JSDOM\n (fabric.isLikelyNode ? style.fontWeight : style.fontStyle),\n (fabric.isLikelyNode ? style.fontStyle : style.fontWeight),\n forMeasuring ? this.CACHE_FONT_SIZE + 'px' : style.fontSize + 'px',\n fontFamily\n ].join(' ');\n },\n\n /**\n * Renders text instance on a specified context\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n render: function(ctx) {\n // do not render if object is not visible\n if (!this.visible) {\n return;\n }\n if (this.canvas && this.canvas.skipOffscreen && !this.group && !this.isOnScreen()) {\n return;\n }\n if (this._shouldClearDimensionCache()) {\n this.initDimensions();\n }\n this.callSuper('render', ctx);\n },\n\n /**\n * Returns the text as an array of lines.\n * @param {String} text text to split\n * @returns {Array} Lines in the text\n */\n _splitTextIntoLines: function(text) {\n var lines = text.split(this._reNewline),\n newLines = new Array(lines.length),\n newLine = ['\\n'],\n newText = [];\n for (var i = 0; i < lines.length; i++) {\n newLines[i] = fabric.util.string.graphemeSplit(lines[i]);\n newText = newText.concat(newLines[i], newLine);\n }\n newText.pop();\n return { _unwrappedLines: newLines, lines: lines, graphemeText: newText, graphemeLines: newLines };\n },\n\n /**\n * Returns object representation of an instance\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} Object representation of an instance\n */\n toObject: function(propertiesToInclude) {\n var additionalProperties = [\n 'text',\n 'fontSize',\n 'fontWeight',\n 'fontFamily',\n 'fontStyle',\n 'lineHeight',\n 'underline',\n 'overline',\n 'linethrough',\n 'textAlign',\n 'textBackgroundColor',\n 'charSpacing',\n ].concat(propertiesToInclude);\n var obj = this.callSuper('toObject', additionalProperties);\n obj.styles = clone(this.styles, true);\n return obj;\n },\n\n /**\n * Sets property to a given value. When changing position/dimension -related properties (left, top, scale, angle, etc.) `set` does not update position of object's borders/controls. If you need to update those, call `setCoords()`.\n * @param {String|Object} key Property name or object (if object, iterate over the object properties)\n * @param {Object|Function} value Property value (if function, the value is passed into it and its return value is used as a new one)\n * @return {fabric.Object} thisArg\n * @chainable\n */\n set: function(key, value) {\n this.callSuper('set', key, value);\n var needsDims = false;\n if (typeof key === 'object') {\n for (var _key in key) {\n needsDims = needsDims || this._dimensionAffectingProps.indexOf(_key) !== -1;\n }\n }\n else {\n needsDims = this._dimensionAffectingProps.indexOf(key) !== -1;\n }\n if (needsDims) {\n this.initDimensions();\n this.setCoords();\n }\n return this;\n },\n\n /**\n * Returns complexity of an instance\n * @return {Number} complexity\n */\n complexity: function() {\n return 1;\n }\n });\n\n /* _FROM_SVG_START_ */\n /**\n * List of attribute names to account for when parsing SVG element (used by {@link fabric.Text.fromElement})\n * @static\n * @memberOf fabric.Text\n * @see: http://www.w3.org/TR/SVG/text.html#TextElement\n */\n fabric.Text.ATTRIBUTE_NAMES = fabric.SHARED_ATTRIBUTES.concat(\n 'x y dx dy font-family font-style font-weight font-size letter-spacing text-decoration text-anchor'.split(' '));\n\n /**\n * Default SVG font size\n * @static\n * @memberOf fabric.Text\n */\n fabric.Text.DEFAULT_SVG_FONT_SIZE = 16;\n\n /**\n * Returns fabric.Text instance from an SVG element (<b>not yet implemented</b>)\n * @static\n * @memberOf fabric.Text\n * @param {SVGElement} element Element to parse\n * @param {Function} callback callback function invoked after parsing\n * @param {Object} [options] Options object\n */\n fabric.Text.fromElement = function(element, callback, options) {\n if (!element) {\n return callback(null);\n }\n\n var parsedAttributes = fabric.parseAttributes(element, fabric.Text.ATTRIBUTE_NAMES),\n parsedAnchor = parsedAttributes.textAnchor || 'left';\n options = fabric.util.object.extend((options ? clone(options) : { }), parsedAttributes);\n\n options.top = options.top || 0;\n options.left = options.left || 0;\n if (parsedAttributes.textDecoration) {\n var textDecoration = parsedAttributes.textDecoration;\n if (textDecoration.indexOf('underline') !== -1) {\n options.underline = true;\n }\n if (textDecoration.indexOf('overline') !== -1) {\n options.overline = true;\n }\n if (textDecoration.indexOf('line-through') !== -1) {\n options.linethrough = true;\n }\n delete options.textDecoration;\n }\n if ('dx' in parsedAttributes) {\n options.left += parsedAttributes.dx;\n }\n if ('dy' in parsedAttributes) {\n options.top += parsedAttributes.dy;\n }\n if (!('fontSize' in options)) {\n options.fontSize = fabric.Text.DEFAULT_SVG_FONT_SIZE;\n }\n\n var textContent = '';\n\n // The XML is not properly parsed in IE9 so a workaround to get\n // textContent is through firstChild.data. Another workaround would be\n // to convert XML loaded from a file to be converted using DOMParser (same way loadSVGFromString() does)\n if (!('textContent' in element)) {\n if ('firstChild' in element && element.firstChild !== null) {\n if ('data' in element.firstChild && element.firstChild.data !== null) {\n textContent = element.firstChild.data;\n }\n }\n }\n else {\n textContent = element.textContent;\n }\n\n textContent = textContent.replace(/^\\s+|\\s+$|\\n+/g, '').replace(/\\s+/g, ' ');\n var originalStrokeWidth = options.strokeWidth;\n options.strokeWidth = 0;\n\n var text = new fabric.Text(textContent, options),\n textHeightScaleFactor = text.getScaledHeight() / text.height,\n lineHeightDiff = (text.height + text.strokeWidth) * text.lineHeight - text.height,\n scaledDiff = lineHeightDiff * textHeightScaleFactor,\n textHeight = text.getScaledHeight() + scaledDiff,\n offX = 0;\n /*\n Adjust positioning:\n x/y attributes in SVG correspond to the bottom-left corner of text bounding box\n fabric output by default at top, left.\n */\n if (parsedAnchor === 'center') {\n offX = text.getScaledWidth() / 2;\n }\n if (parsedAnchor === 'right') {\n offX = text.getScaledWidth();\n }\n text.set({\n left: text.left - offX,\n top: text.top - (textHeight - text.fontSize * (0.07 + text._fontSizeFraction)) / text.lineHeight,\n strokeWidth: typeof originalStrokeWidth !== 'undefined' ? originalStrokeWidth : 1,\n });\n callback(text);\n };\n /* _FROM_SVG_END_ */\n\n /**\n * Returns fabric.Text instance from an object representation\n * @static\n * @memberOf fabric.Text\n * @param {Object} object Object to create an instance from\n * @param {Function} [callback] Callback to invoke when an fabric.Text instance is created\n */\n fabric.Text.fromObject = function(object, callback) {\n return fabric.Object._fromObject('Text', object, callback, 'text');\n };\n\n fabric.Text.genericFonts = ['sans-serif', 'serif', 'cursive', 'fantasy', 'monospace'];\n\n fabric.util.createAccessors && fabric.util.createAccessors(fabric.Text);\n\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function() {\n fabric.util.object.extend(fabric.Text.prototype, /** @lends fabric.Text.prototype */ {\n /**\n * Returns true if object has no styling or no styling in a line\n * @param {Number} lineIndex , lineIndex is on wrapped lines.\n * @return {Boolean}\n */\n isEmptyStyles: function(lineIndex) {\n if (!this.styles) {\n return true;\n }\n if (typeof lineIndex !== 'undefined' && !this.styles[lineIndex]) {\n return true;\n }\n var obj = typeof lineIndex === 'undefined' ? this.styles : { line: this.styles[lineIndex] };\n for (var p1 in obj) {\n for (var p2 in obj[p1]) {\n // eslint-disable-next-line no-unused-vars\n for (var p3 in obj[p1][p2]) {\n return false;\n }\n }\n }\n return true;\n },\n\n /**\n * Returns true if object has a style property or has it ina specified line\n * This function is used to detect if a text will use a particular property or not.\n * @param {String} property to check for\n * @param {Number} lineIndex to check the style on\n * @return {Boolean}\n */\n styleHas: function(property, lineIndex) {\n if (!this.styles || !property || property === '') {\n return false;\n }\n if (typeof lineIndex !== 'undefined' && !this.styles[lineIndex]) {\n return false;\n }\n var obj = typeof lineIndex === 'undefined' ? this.styles : { 0: this.styles[lineIndex] };\n // eslint-disable-next-line\n for (var p1 in obj) {\n // eslint-disable-next-line\n for (var p2 in obj[p1]) {\n if (typeof obj[p1][p2][property] !== 'undefined') {\n return true;\n }\n }\n }\n return false;\n },\n\n /**\n * Check if characters in a text have a value for a property\n * whose value matches the textbox's value for that property. If so,\n * the character-level property is deleted. If the character\n * has no other properties, then it is also deleted. Finally,\n * if the line containing that character has no other characters\n * then it also is deleted.\n *\n * @param {string} property The property to compare between characters and text.\n */\n cleanStyle: function(property) {\n if (!this.styles || !property || property === '') {\n return false;\n }\n var obj = this.styles, stylesCount = 0, letterCount, stylePropertyValue,\n allStyleObjectPropertiesMatch = true, graphemeCount = 0, styleObject;\n // eslint-disable-next-line\n for (var p1 in obj) {\n letterCount = 0;\n // eslint-disable-next-line\n for (var p2 in obj[p1]) {\n var styleObject = obj[p1][p2],\n stylePropertyHasBeenSet = styleObject.hasOwnProperty(property);\n\n stylesCount++;\n\n if (stylePropertyHasBeenSet) {\n if (!stylePropertyValue) {\n stylePropertyValue = styleObject[property];\n }\n else if (styleObject[property] !== stylePropertyValue) {\n allStyleObjectPropertiesMatch = false;\n }\n\n if (styleObject[property] === this[property]) {\n delete styleObject[property];\n }\n }\n else {\n allStyleObjectPropertiesMatch = false;\n }\n\n if (Object.keys(styleObject).length !== 0) {\n letterCount++;\n }\n else {\n delete obj[p1][p2];\n }\n }\n\n if (letterCount === 0) {\n delete obj[p1];\n }\n }\n // if every grapheme has the same style set then\n // delete those styles and set it on the parent\n for (var i = 0; i < this._textLines.length; i++) {\n graphemeCount += this._textLines[i].length;\n }\n if (allStyleObjectPropertiesMatch && stylesCount === graphemeCount) {\n this[property] = stylePropertyValue;\n this.removeStyle(property);\n }\n },\n\n /**\n * Remove a style property or properties from all individual character styles\n * in a text object. Deletes the character style object if it contains no other style\n * props. Deletes a line style object if it contains no other character styles.\n *\n * @param {String} props The property to remove from character styles.\n */\n removeStyle: function(property) {\n if (!this.styles || !property || property === '') {\n return;\n }\n var obj = this.styles, line, lineNum, charNum;\n for (lineNum in obj) {\n line = obj[lineNum];\n for (charNum in line) {\n delete line[charNum][property];\n if (Object.keys(line[charNum]).length === 0) {\n delete line[charNum];\n }\n }\n if (Object.keys(line).length === 0) {\n delete obj[lineNum];\n }\n }\n },\n\n /**\n * @private\n */\n _extendStyles: function(index, styles) {\n var loc = this.get2DCursorLocation(index);\n\n if (!this._getLineStyle(loc.lineIndex)) {\n this._setLineStyle(loc.lineIndex);\n }\n\n if (!this._getStyleDeclaration(loc.lineIndex, loc.charIndex)) {\n this._setStyleDeclaration(loc.lineIndex, loc.charIndex, {});\n }\n\n fabric.util.object.extend(this._getStyleDeclaration(loc.lineIndex, loc.charIndex), styles);\n },\n\n /**\n * Returns 2d representation (lineIndex and charIndex) of cursor (or selection start)\n * @param {Number} [selectionStart] Optional index. When not given, current selectionStart is used.\n * @param {Boolean} [skipWrapping] consider the location for unwrapped lines. useful to manage styles.\n */\n get2DCursorLocation: function(selectionStart, skipWrapping) {\n if (typeof selectionStart === 'undefined') {\n selectionStart = this.selectionStart;\n }\n var lines = skipWrapping ? this._unwrappedTextLines : this._textLines,\n len = lines.length;\n for (var i = 0; i < len; i++) {\n if (selectionStart <= lines[i].length) {\n return {\n lineIndex: i,\n charIndex: selectionStart\n };\n }\n selectionStart -= lines[i].length + this.missingNewlineOffset(i);\n }\n return {\n lineIndex: i - 1,\n charIndex: lines[i - 1].length < selectionStart ? lines[i - 1].length : selectionStart\n };\n },\n\n /**\n * Gets style of a current selection/cursor (at the start position)\n * if startIndex or endIndex are not provided, slectionStart or selectionEnd will be used.\n * @param {Number} [startIndex] Start index to get styles at\n * @param {Number} [endIndex] End index to get styles at, if not specified selectionEnd or startIndex + 1\n * @param {Boolean} [complete] get full style or not\n * @return {Array} styles an array with one, zero or more Style objects\n */\n getSelectionStyles: function(startIndex, endIndex, complete) {\n if (typeof startIndex === 'undefined') {\n startIndex = this.selectionStart || 0;\n }\n if (typeof endIndex === 'undefined') {\n endIndex = this.selectionEnd || startIndex;\n }\n var styles = [];\n for (var i = startIndex; i < endIndex; i++) {\n styles.push(this.getStyleAtPosition(i, complete));\n }\n return styles;\n },\n\n /**\n * Gets style of a current selection/cursor position\n * @param {Number} position to get styles at\n * @param {Boolean} [complete] full style if true\n * @return {Object} style Style object at a specified index\n * @private\n */\n getStyleAtPosition: function(position, complete) {\n var loc = this.get2DCursorLocation(position),\n style = complete ? this.getCompleteStyleDeclaration(loc.lineIndex, loc.charIndex) :\n this._getStyleDeclaration(loc.lineIndex, loc.charIndex);\n return style || {};\n },\n\n /**\n * Sets style of a current selection, if no selection exist, do not set anything.\n * @param {Object} [styles] Styles object\n * @param {Number} [startIndex] Start index to get styles at\n * @param {Number} [endIndex] End index to get styles at, if not specified selectionEnd or startIndex + 1\n * @return {fabric.IText} thisArg\n * @chainable\n */\n setSelectionStyles: function(styles, startIndex, endIndex) {\n if (typeof startIndex === 'undefined') {\n startIndex = this.selectionStart || 0;\n }\n if (typeof endIndex === 'undefined') {\n endIndex = this.selectionEnd || startIndex;\n }\n for (var i = startIndex; i < endIndex; i++) {\n this._extendStyles(i, styles);\n }\n /* not included in _extendStyles to avoid clearing cache more than once */\n this._forceClearCache = true;\n return this;\n },\n\n /**\n * get the reference, not a clone, of the style object for a given character\n * @param {Number} lineIndex\n * @param {Number} charIndex\n * @return {Object} style object\n */\n _getStyleDeclaration: function(lineIndex, charIndex) {\n var lineStyle = this.styles && this.styles[lineIndex];\n if (!lineStyle) {\n return null;\n }\n return lineStyle[charIndex];\n },\n\n /**\n * return a new object that contains all the style property for a character\n * the object returned is newly created\n * @param {Number} lineIndex of the line where the character is\n * @param {Number} charIndex position of the character on the line\n * @return {Object} style object\n */\n getCompleteStyleDeclaration: function(lineIndex, charIndex) {\n var style = this._getStyleDeclaration(lineIndex, charIndex) || { },\n styleObject = { }, prop;\n for (var i = 0; i < this._styleProperties.length; i++) {\n prop = this._styleProperties[i];\n styleObject[prop] = typeof style[prop] === 'undefined' ? this[prop] : style[prop];\n }\n return styleObject;\n },\n\n /**\n * @param {Number} lineIndex\n * @param {Number} charIndex\n * @param {Object} style\n * @private\n */\n _setStyleDeclaration: function(lineIndex, charIndex, style) {\n this.styles[lineIndex][charIndex] = style;\n },\n\n /**\n *\n * @param {Number} lineIndex\n * @param {Number} charIndex\n * @private\n */\n _deleteStyleDeclaration: function(lineIndex, charIndex) {\n delete this.styles[lineIndex][charIndex];\n },\n\n /**\n * @param {Number} lineIndex\n * @return {Boolean} if the line exists or not\n * @private\n */\n _getLineStyle: function(lineIndex) {\n return !!this.styles[lineIndex];\n },\n\n /**\n * Set the line style to an empty object so that is initialized\n * @param {Number} lineIndex\n * @private\n */\n _setLineStyle: function(lineIndex) {\n this.styles[lineIndex] = {};\n },\n\n /**\n * @param {Number} lineIndex\n * @private\n */\n _deleteLineStyle: function(lineIndex) {\n delete this.styles[lineIndex];\n }\n });\n})();\n\n\n(function() {\n\n function parseDecoration(object) {\n if (object.textDecoration) {\n object.textDecoration.indexOf('underline') > -1 && (object.underline = true);\n object.textDecoration.indexOf('line-through') > -1 && (object.linethrough = true);\n object.textDecoration.indexOf('overline') > -1 && (object.overline = true);\n delete object.textDecoration;\n }\n }\n\n /**\n * IText class (introduced in <b>v1.4</b>) Events are also fired with \"text:\"\n * prefix when observing canvas.\n * @class fabric.IText\n * @extends fabric.Text\n * @mixes fabric.Observable\n *\n * @fires changed\n * @fires selection:changed\n * @fires editing:entered\n * @fires editing:exited\n *\n * @return {fabric.IText} thisArg\n * @see {@link fabric.IText#initialize} for constructor definition\n *\n * <p>Supported key combinations:</p>\n * <pre>\n * Move cursor: left, right, up, down\n * Select character: shift + left, shift + right\n * Select text vertically: shift + up, shift + down\n * Move cursor by word: alt + left, alt + right\n * Select words: shift + alt + left, shift + alt + right\n * Move cursor to line start/end: cmd + left, cmd + right or home, end\n * Select till start/end of line: cmd + shift + left, cmd + shift + right or shift + home, shift + end\n * Jump to start/end of text: cmd + up, cmd + down\n * Select till start/end of text: cmd + shift + up, cmd + shift + down or shift + pgUp, shift + pgDown\n * Delete character: backspace\n * Delete word: alt + backspace\n * Delete line: cmd + backspace\n * Forward delete: delete\n * Copy text: ctrl/cmd + c\n * Paste text: ctrl/cmd + v\n * Cut text: ctrl/cmd + x\n * Select entire text: ctrl/cmd + a\n * Quit editing tab or esc\n * </pre>\n *\n * <p>Supported mouse/touch combination</p>\n * <pre>\n * Position cursor: click/touch\n * Create selection: click/touch & drag\n * Create selection: click & shift + click\n * Select word: double click\n * Select line: triple click\n * </pre>\n */\n fabric.IText = fabric.util.createClass(fabric.Text, fabric.Observable, /** @lends fabric.IText.prototype */ {\n\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'i-text',\n\n /**\n * Index where text selection starts (or where cursor is when there is no selection)\n * @type Number\n * @default\n */\n selectionStart: 0,\n\n /**\n * Index where text selection ends\n * @type Number\n * @default\n */\n selectionEnd: 0,\n\n /**\n * Color of text selection\n * @type String\n * @default\n */\n selectionColor: 'rgba(17,119,255,0.3)',\n\n /**\n * Indicates whether text is in editing mode\n * @type Boolean\n * @default\n */\n isEditing: false,\n\n /**\n * Indicates whether a text can be edited\n * @type Boolean\n * @default\n */\n editable: true,\n\n /**\n * Border color of text object while it's in editing mode\n * @type String\n * @default\n */\n editingBorderColor: 'rgba(102,153,255,0.25)',\n\n /**\n * Width of cursor (in px)\n * @type Number\n * @default\n */\n cursorWidth: 2,\n\n /**\n * Color of text cursor color in editing mode.\n * if not set (default) will take color from the text.\n * if set to a color value that fabric can understand, it will\n * be used instead of the color of the text at the current position.\n * @type String\n * @default\n */\n cursorColor: '',\n\n /**\n * Delay between cursor blink (in ms)\n * @type Number\n * @default\n */\n cursorDelay: 1000,\n\n /**\n * Duration of cursor fadein (in ms)\n * @type Number\n * @default\n */\n cursorDuration: 600,\n\n /**\n * Indicates whether internal text char widths can be cached\n * @type Boolean\n * @default\n */\n caching: true,\n\n /**\n * @private\n */\n _reSpace: /\\s|\\n/,\n\n /**\n * @private\n */\n _currentCursorOpacity: 0,\n\n /**\n * @private\n */\n _selectionDirection: null,\n\n /**\n * @private\n */\n _abortCursorAnimation: false,\n\n /**\n * @private\n */\n __widthOfSpace: [],\n\n /**\n * Helps determining when the text is in composition, so that the cursor\n * rendering is altered.\n */\n inCompositionMode: false,\n\n /**\n * Constructor\n * @param {String} text Text string\n * @param {Object} [options] Options object\n * @return {fabric.IText} thisArg\n */\n initialize: function(text, options) {\n this.callSuper('initialize', text, options);\n this.initBehavior();\n },\n\n /**\n * Sets selection start (left boundary of a selection)\n * @param {Number} index Index to set selection start to\n */\n setSelectionStart: function(index) {\n index = Math.max(index, 0);\n this._updateAndFire('selectionStart', index);\n },\n\n /**\n * Sets selection end (right boundary of a selection)\n * @param {Number} index Index to set selection end to\n */\n setSelectionEnd: function(index) {\n index = Math.min(index, this.text.length);\n this._updateAndFire('selectionEnd', index);\n },\n\n /**\n * @private\n * @param {String} property 'selectionStart' or 'selectionEnd'\n * @param {Number} index new position of property\n */\n _updateAndFire: function(property, index) {\n if (this[property] !== index) {\n this._fireSelectionChanged();\n this[property] = index;\n }\n this._updateTextarea();\n },\n\n /**\n * Fires the even of selection changed\n * @private\n */\n _fireSelectionChanged: function() {\n this.fire('selection:changed');\n this.canvas && this.canvas.fire('text:selection:changed', { target: this });\n },\n\n /**\n * Initialize text dimensions. Render all text on given context\n * or on a offscreen canvas to get the text width with measureText.\n * Updates this.width and this.height with the proper values.\n * Does not return dimensions.\n * @private\n */\n initDimensions: function() {\n this.isEditing && this.initDelayedCursor();\n this.clearContextTop();\n this.callSuper('initDimensions');\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n render: function(ctx) {\n this.clearContextTop();\n this.callSuper('render', ctx);\n // clear the cursorOffsetCache, so we ensure to calculate once per renderCursor\n // the correct position but not at every cursor animation.\n this.cursorOffsetCache = { };\n this.renderCursorOrSelection();\n },\n\n /**\n * @private\n * @param {CanvasRenderingContext2D} ctx Context to render on\n */\n _render: function(ctx) {\n this.callSuper('_render', ctx);\n },\n\n /**\n * Prepare and clean the contextTop\n */\n clearContextTop: function(skipRestore) {\n if (!this.isEditing || !this.canvas || !this.canvas.contextTop) {\n return;\n }\n var ctx = this.canvas.contextTop, v = this.canvas.viewportTransform;\n ctx.save();\n ctx.transform(v[0], v[1], v[2], v[3], v[4], v[5]);\n this.transform(ctx);\n this._clearTextArea(ctx);\n skipRestore || ctx.restore();\n },\n /**\n * Renders cursor or selection (depending on what exists)\n * it does on the contextTop. If contextTop is not available, do nothing.\n */\n renderCursorOrSelection: function() {\n if (!this.isEditing || !this.canvas || !this.canvas.contextTop) {\n return;\n }\n var boundaries = this._getCursorBoundaries(),\n ctx = this.canvas.contextTop;\n this.clearContextTop(true);\n if (this.selectionStart === this.selectionEnd) {\n this.renderCursor(boundaries, ctx);\n }\n else {\n this.renderSelection(boundaries, ctx);\n }\n ctx.restore();\n },\n\n _clearTextArea: function(ctx) {\n // we add 4 pixel, to be sure to do not leave any pixel out\n var width = this.width + 4, height = this.height + 4;\n ctx.clearRect(-width / 2, -height / 2, width, height);\n },\n\n /**\n * Returns cursor boundaries (left, top, leftOffset, topOffset)\n * @private\n * @param {Array} chars Array of characters\n * @param {String} typeOfBoundaries\n */\n _getCursorBoundaries: function(position) {\n\n // left/top are left/top of entire text box\n // leftOffset/topOffset are offset from that left/top point of a text box\n\n if (typeof position === 'undefined') {\n position = this.selectionStart;\n }\n\n var left = this._getLeftOffset(),\n top = this._getTopOffset(),\n offsets = this._getCursorBoundariesOffsets(position);\n\n return {\n left: left,\n top: top,\n leftOffset: offsets.left,\n topOffset: offsets.top\n };\n },\n\n /**\n * @private\n */\n _getCursorBoundariesOffsets: function(position) {\n if (this.cursorOffsetCache && 'top' in this.cursorOffsetCache) {\n return this.cursorOffsetCache;\n }\n var lineLeftOffset,\n lineIndex,\n charIndex,\n topOffset = 0,\n leftOffset = 0,\n boundaries,\n cursorPosition = this.get2DCursorLocation(position);\n charIndex = cursorPosition.charIndex;\n lineIndex = cursorPosition.lineIndex;\n for (var i = 0; i < lineIndex; i++) {\n topOffset += this.getHeightOfLine(i);\n }\n lineLeftOffset = this._getLineLeftOffset(lineIndex);\n var bound = this.__charBounds[lineIndex][charIndex];\n bound && (leftOffset = bound.left);\n if (this.charSpacing !== 0 && charIndex === this._textLines[lineIndex].length) {\n leftOffset -= this._getWidthOfCharSpacing();\n }\n boundaries = {\n top: topOffset,\n left: lineLeftOffset + (leftOffset > 0 ? leftOffset : 0),\n };\n this.cursorOffsetCache = boundaries;\n return this.cursorOffsetCache;\n },\n\n /**\n * Renders cursor\n * @param {Object} boundaries\n * @param {CanvasRenderingContext2D} ctx transformed context to draw on\n */\n renderCursor: function(boundaries, ctx) {\n var cursorLocation = this.get2DCursorLocation(),\n lineIndex = cursorLocation.lineIndex,\n charIndex = cursorLocation.charIndex > 0 ? cursorLocation.charIndex - 1 : 0,\n charHeight = this.getValueOfPropertyAt(lineIndex, charIndex, 'fontSize'),\n multiplier = this.scaleX * this.canvas.getZoom(),\n cursorWidth = this.cursorWidth / multiplier,\n topOffset = boundaries.topOffset,\n dy = this.getValueOfPropertyAt(lineIndex, charIndex, 'deltaY');\n\n topOffset += (1 - this._fontSizeFraction) * this.getHeightOfLine(lineIndex) / this.lineHeight\n - charHeight * (1 - this._fontSizeFraction);\n\n if (this.inCompositionMode) {\n this.renderSelection(boundaries, ctx);\n }\n\n ctx.fillStyle = this.cursorColor || this.getValueOfPropertyAt(lineIndex, charIndex, 'fill');\n ctx.globalAlpha = this.__isMousedown ? 1 : this._currentCursorOpacity;\n ctx.fillRect(\n boundaries.left + boundaries.leftOffset - cursorWidth / 2,\n topOffset + boundaries.top + dy,\n cursorWidth,\n charHeight);\n },\n\n /**\n * Renders text selection\n * @param {Object} boundaries Object with left/top/leftOffset/topOffset\n * @param {CanvasRenderingContext2D} ctx transformed context to draw on\n */\n renderSelection: function(boundaries, ctx) {\n\n var selectionStart = this.inCompositionMode ? this.hiddenTextarea.selectionStart : this.selectionStart,\n selectionEnd = this.inCompositionMode ? this.hiddenTextarea.selectionEnd : this.selectionEnd,\n isJustify = this.textAlign.indexOf('justify') !== -1,\n start = this.get2DCursorLocation(selectionStart),\n end = this.get2DCursorLocation(selectionEnd),\n startLine = start.lineIndex,\n endLine = end.lineIndex,\n startChar = start.charIndex < 0 ? 0 : start.charIndex,\n endChar = end.charIndex < 0 ? 0 : end.charIndex;\n\n for (var i = startLine; i <= endLine; i++) {\n var lineOffset = this._getLineLeftOffset(i) || 0,\n lineHeight = this.getHeightOfLine(i),\n realLineHeight = 0, boxStart = 0, boxEnd = 0;\n\n if (i === startLine) {\n boxStart = this.__charBounds[startLine][startChar].left;\n }\n if (i >= startLine && i < endLine) {\n boxEnd = isJustify && !this.isEndOfWrapping(i) ? this.width : this.getLineWidth(i) || 5; // WTF is this 5?\n }\n else if (i === endLine) {\n if (endChar === 0) {\n boxEnd = this.__charBounds[endLine][endChar].left;\n }\n else {\n var charSpacing = this._getWidthOfCharSpacing();\n boxEnd = this.__charBounds[endLine][endChar - 1].left\n + this.__charBounds[endLine][endChar - 1].width - charSpacing;\n }\n }\n realLineHeight = lineHeight;\n if (this.lineHeight < 1 || (i === endLine && this.lineHeight > 1)) {\n lineHeight /= this.lineHeight;\n }\n if (this.inCompositionMode) {\n ctx.fillStyle = this.compositionColor || 'black';\n ctx.fillRect(\n boundaries.left + lineOffset + boxStart,\n boundaries.top + boundaries.topOffset + lineHeight,\n boxEnd - boxStart,\n 1);\n }\n else {\n ctx.fillStyle = this.selectionColor;\n ctx.fillRect(\n boundaries.left + lineOffset + boxStart,\n boundaries.top + boundaries.topOffset,\n boxEnd - boxStart,\n lineHeight);\n }\n\n\n boundaries.topOffset += realLineHeight;\n }\n },\n\n /**\n * High level function to know the height of the cursor.\n * the currentChar is the one that precedes the cursor\n * Returns fontSize of char at the current cursor\n * Unused from the library, is for the end user\n * @return {Number} Character font size\n */\n getCurrentCharFontSize: function() {\n var cp = this._getCurrentCharIndex();\n return this.getValueOfPropertyAt(cp.l, cp.c, 'fontSize');\n },\n\n /**\n * High level function to know the color of the cursor.\n * the currentChar is the one that precedes the cursor\n * Returns color (fill) of char at the current cursor\n * Unused from the library, is for the end user\n * @return {String} Character color (fill)\n */\n getCurrentCharColor: function() {\n var cp = this._getCurrentCharIndex();\n return this.getValueOfPropertyAt(cp.l, cp.c, 'fill');\n },\n\n /**\n * Returns the cursor position for the getCurrent.. functions\n * @private\n */\n _getCurrentCharIndex: function() {\n var cursorPosition = this.get2DCursorLocation(this.selectionStart, true),\n charIndex = cursorPosition.charIndex > 0 ? cursorPosition.charIndex - 1 : 0;\n return { l: cursorPosition.lineIndex, c: charIndex };\n }\n });\n\n /**\n * Returns fabric.IText instance from an object representation\n * @static\n * @memberOf fabric.IText\n * @param {Object} object Object to create an instance from\n * @param {function} [callback] invoked with new instance as argument\n */\n fabric.IText.fromObject = function(object, callback) {\n parseDecoration(object);\n if (object.styles) {\n for (var i in object.styles) {\n for (var j in object.styles[i]) {\n parseDecoration(object.styles[i][j]);\n }\n }\n }\n fabric.Object._fromObject('IText', object, callback, 'text');\n };\n})();\n\n\n(function() {\n\n var clone = fabric.util.object.clone;\n\n fabric.util.object.extend(fabric.IText.prototype, /** @lends fabric.IText.prototype */ {\n\n /**\n * Initializes all the interactive behavior of IText\n */\n initBehavior: function() {\n this.initAddedHandler();\n this.initRemovedHandler();\n this.initCursorSelectionHandlers();\n this.initDoubleClickSimulation();\n this.mouseMoveHandler = this.mouseMoveHandler.bind(this);\n },\n\n onDeselect: function() {\n this.isEditing && this.exitEditing();\n this.selected = false;\n },\n\n /**\n * Initializes \"added\" event handler\n */\n initAddedHandler: function() {\n var _this = this;\n this.on('added', function() {\n var canvas = _this.canvas;\n if (canvas) {\n if (!canvas._hasITextHandlers) {\n canvas._hasITextHandlers = true;\n _this._initCanvasHandlers(canvas);\n }\n canvas._iTextInstances = canvas._iTextInstances || [];\n canvas._iTextInstances.push(_this);\n }\n });\n },\n\n initRemovedHandler: function() {\n var _this = this;\n this.on('removed', function() {\n var canvas = _this.canvas;\n if (canvas) {\n canvas._iTextInstances = canvas._iTextInstances || [];\n fabric.util.removeFromArray(canvas._iTextInstances, _this);\n if (canvas._iTextInstances.length === 0) {\n canvas._hasITextHandlers = false;\n _this._removeCanvasHandlers(canvas);\n }\n }\n });\n },\n\n /**\n * register canvas event to manage exiting on other instances\n * @private\n */\n _initCanvasHandlers: function(canvas) {\n canvas._mouseUpITextHandler = function() {\n if (canvas._iTextInstances) {\n canvas._iTextInstances.forEach(function(obj) {\n obj.__isMousedown = false;\n });\n }\n };\n canvas.on('mouse:up', canvas._mouseUpITextHandler);\n },\n\n /**\n * remove canvas event to manage exiting on other instances\n * @private\n */\n _removeCanvasHandlers: function(canvas) {\n canvas.off('mouse:up', canvas._mouseUpITextHandler);\n },\n\n /**\n * @private\n */\n _tick: function() {\n this._currentTickState = this._animateCursor(this, 1, this.cursorDuration, '_onTickComplete');\n },\n\n /**\n * @private\n */\n _animateCursor: function(obj, targetOpacity, duration, completeMethod) {\n\n var tickState;\n\n tickState = {\n isAborted: false,\n abort: function() {\n this.isAborted = true;\n },\n };\n\n obj.animate('_currentCursorOpacity', targetOpacity, {\n duration: duration,\n onComplete: function() {\n if (!tickState.isAborted) {\n obj[completeMethod]();\n }\n },\n onChange: function() {\n // we do not want to animate a selection, only cursor\n if (obj.canvas && obj.selectionStart === obj.selectionEnd) {\n obj.renderCursorOrSelection();\n }\n },\n abort: function() {\n return tickState.isAborted;\n }\n });\n return tickState;\n },\n\n /**\n * @private\n */\n _onTickComplete: function() {\n\n var _this = this;\n\n if (this._cursorTimeout1) {\n clearTimeout(this._cursorTimeout1);\n }\n this._cursorTimeout1 = setTimeout(function() {\n _this._currentTickCompleteState = _this._animateCursor(_this, 0, this.cursorDuration / 2, '_tick');\n }, 100);\n },\n\n /**\n * Initializes delayed cursor\n */\n initDelayedCursor: function(restart) {\n var _this = this,\n delay = restart ? 0 : this.cursorDelay;\n\n this.abortCursorAnimation();\n this._currentCursorOpacity = 1;\n this._cursorTimeout2 = setTimeout(function() {\n _this._tick();\n }, delay);\n },\n\n /**\n * Aborts cursor animation and clears all timeouts\n */\n abortCursorAnimation: function() {\n var shouldClear = this._currentTickState || this._currentTickCompleteState,\n canvas = this.canvas;\n this._currentTickState && this._currentTickState.abort();\n this._currentTickCompleteState && this._currentTickCompleteState.abort();\n\n clearTimeout(this._cursorTimeout1);\n clearTimeout(this._cursorTimeout2);\n\n this._currentCursorOpacity = 0;\n // to clear just itext area we need to transform the context\n // it may not be worth it\n if (shouldClear && canvas) {\n canvas.clearContext(canvas.contextTop || canvas.contextContainer);\n }\n\n },\n\n /**\n * Selects entire text\n * @return {fabric.IText} thisArg\n * @chainable\n */\n selectAll: function() {\n this.selectionStart = 0;\n this.selectionEnd = this._text.length;\n this._fireSelectionChanged();\n this._updateTextarea();\n return this;\n },\n\n /**\n * Returns selected text\n * @return {String}\n */\n getSelectedText: function() {\n return this._text.slice(this.selectionStart, this.selectionEnd).join('');\n },\n\n /**\n * Find new selection index representing start of current word according to current selection index\n * @param {Number} startFrom Current selection index\n * @return {Number} New selection index\n */\n findWordBoundaryLeft: function(startFrom) {\n var offset = 0, index = startFrom - 1;\n\n // remove space before cursor first\n if (this._reSpace.test(this._text[index])) {\n while (this._reSpace.test(this._text[index])) {\n offset++;\n index--;\n }\n }\n while (/\\S/.test(this._text[index]) && index > -1) {\n offset++;\n index--;\n }\n\n return startFrom - offset;\n },\n\n /**\n * Find new selection index representing end of current word according to current selection index\n * @param {Number} startFrom Current selection index\n * @return {Number} New selection index\n */\n findWordBoundaryRight: function(startFrom) {\n var offset = 0, index = startFrom;\n\n // remove space after cursor first\n if (this._reSpace.test(this._text[index])) {\n while (this._reSpace.test(this._text[index])) {\n offset++;\n index++;\n }\n }\n while (/\\S/.test(this._text[index]) && index < this._text.length) {\n offset++;\n index++;\n }\n\n return startFrom + offset;\n },\n\n /**\n * Find new selection index representing start of current line according to current selection index\n * @param {Number} startFrom Current selection index\n * @return {Number} New selection index\n */\n findLineBoundaryLeft: function(startFrom) {\n var offset = 0, index = startFrom - 1;\n\n while (!/\\n/.test(this._text[index]) && index > -1) {\n offset++;\n index--;\n }\n\n return startFrom - offset;\n },\n\n /**\n * Find new selection index representing end of current line according to current selection index\n * @param {Number} startFrom Current selection index\n * @return {Number} New selection index\n */\n findLineBoundaryRight: function(startFrom) {\n var offset = 0, index = startFrom;\n\n while (!/\\n/.test(this._text[index]) && index < this._text.length) {\n offset++;\n index++;\n }\n\n return startFrom + offset;\n },\n\n /**\n * Finds index corresponding to beginning or end of a word\n * @param {Number} selectionStart Index of a character\n * @param {Number} direction 1 or -1\n * @return {Number} Index of the beginning or end of a word\n */\n searchWordBoundary: function(selectionStart, direction) {\n var text = this._text,\n index = this._reSpace.test(text[selectionStart]) ? selectionStart - 1 : selectionStart,\n _char = text[index],\n // wrong\n reNonWord = fabric.reNonWord;\n\n while (!reNonWord.test(_char) && index > 0 && index < text.length) {\n index += direction;\n _char = text[index];\n }\n if (reNonWord.test(_char)) {\n index += direction === 1 ? 0 : 1;\n }\n return index;\n },\n\n /**\n * Selects a word based on the index\n * @param {Number} selectionStart Index of a character\n */\n selectWord: function(selectionStart) {\n selectionStart = selectionStart || this.selectionStart;\n var newSelectionStart = this.searchWordBoundary(selectionStart, -1), /* search backwards */\n newSelectionEnd = this.searchWordBoundary(selectionStart, 1); /* search forward */\n\n this.selectionStart = newSelectionStart;\n this.selectionEnd = newSelectionEnd;\n this._fireSelectionChanged();\n this._updateTextarea();\n this.renderCursorOrSelection();\n },\n\n /**\n * Selects a line based on the index\n * @param {Number} selectionStart Index of a character\n * @return {fabric.IText} thisArg\n * @chainable\n */\n selectLine: function(selectionStart) {\n selectionStart = selectionStart || this.selectionStart;\n var newSelectionStart = this.findLineBoundaryLeft(selectionStart),\n newSelectionEnd = this.findLineBoundaryRight(selectionStart);\n\n this.selectionStart = newSelectionStart;\n this.selectionEnd = newSelectionEnd;\n this._fireSelectionChanged();\n this._updateTextarea();\n return this;\n },\n\n /**\n * Enters editing state\n * @return {fabric.IText} thisArg\n * @chainable\n */\n enterEditing: function(e) {\n if (this.isEditing || !this.editable) {\n return;\n }\n\n if (this.canvas) {\n this.canvas.calcOffset();\n this.exitEditingOnOthers(this.canvas);\n }\n\n this.isEditing = true;\n\n this.initHiddenTextarea(e);\n this.hiddenTextarea.focus();\n this.hiddenTextarea.value = this.text;\n this._updateTextarea();\n this._saveEditingProps();\n this._setEditingProps();\n this._textBeforeEdit = this.text;\n\n this._tick();\n this.fire('editing:entered');\n this._fireSelectionChanged();\n if (!this.canvas) {\n return this;\n }\n this.canvas.fire('text:editing:entered', { target: this });\n this.initMouseMoveHandler();\n this.canvas.requestRenderAll();\n return this;\n },\n\n exitEditingOnOthers: function(canvas) {\n if (canvas._iTextInstances) {\n canvas._iTextInstances.forEach(function(obj) {\n obj.selected = false;\n if (obj.isEditing) {\n obj.exitEditing();\n }\n });\n }\n },\n\n /**\n * Initializes \"mousemove\" event handler\n */\n initMouseMoveHandler: function() {\n this.canvas.on('mouse:move', this.mouseMoveHandler);\n },\n\n /**\n * @private\n */\n mouseMoveHandler: function(options) {\n if (!this.__isMousedown || !this.isEditing) {\n return;\n }\n\n var newSelectionStart = this.getSelectionStartFromPointer(options.e),\n currentStart = this.selectionStart,\n currentEnd = this.selectionEnd;\n if (\n (newSelectionStart !== this.__selectionStartOnMouseDown || currentStart === currentEnd)\n &&\n (currentStart === newSelectionStart || currentEnd === newSelectionStart)\n ) {\n return;\n }\n if (newSelectionStart > this.__selectionStartOnMouseDown) {\n this.selectionStart = this.__selectionStartOnMouseDown;\n this.selectionEnd = newSelectionStart;\n }\n else {\n this.selectionStart = newSelectionStart;\n this.selectionEnd = this.__selectionStartOnMouseDown;\n }\n if (this.selectionStart !== currentStart || this.selectionEnd !== currentEnd) {\n this.restartCursorIfNeeded();\n this._fireSelectionChanged();\n this._updateTextarea();\n this.renderCursorOrSelection();\n }\n },\n\n /**\n * @private\n */\n _setEditingProps: function() {\n this.hoverCursor = 'text';\n\n if (this.canvas) {\n this.canvas.defaultCursor = this.canvas.moveCursor = 'text';\n }\n\n this.borderColor = this.editingBorderColor;\n this.hasControls = this.selectable = false;\n this.lockMovementX = this.lockMovementY = true;\n },\n\n /**\n * convert from textarea to grapheme indexes\n */\n fromStringToGraphemeSelection: function(start, end, text) {\n var smallerTextStart = text.slice(0, start),\n graphemeStart = fabric.util.string.graphemeSplit(smallerTextStart).length;\n if (start === end) {\n return { selectionStart: graphemeStart, selectionEnd: graphemeStart };\n }\n var smallerTextEnd = text.slice(start, end),\n graphemeEnd = fabric.util.string.graphemeSplit(smallerTextEnd).length;\n return { selectionStart: graphemeStart, selectionEnd: graphemeStart + graphemeEnd };\n },\n\n /**\n * convert from fabric to textarea values\n */\n fromGraphemeToStringSelection: function(start, end, _text) {\n var smallerTextStart = _text.slice(0, start),\n graphemeStart = smallerTextStart.join('').length;\n if (start === end) {\n return { selectionStart: graphemeStart, selectionEnd: graphemeStart };\n }\n var smallerTextEnd = _text.slice(start, end),\n graphemeEnd = smallerTextEnd.join('').length;\n return { selectionStart: graphemeStart, selectionEnd: graphemeStart + graphemeEnd };\n },\n\n /**\n * @private\n */\n _updateTextarea: function() {\n this.cursorOffsetCache = { };\n if (!this.hiddenTextarea) {\n return;\n }\n if (!this.inCompositionMode) {\n var newSelection = this.fromGraphemeToStringSelection(this.selectionStart, this.selectionEnd, this._text);\n this.hiddenTextarea.selectionStart = newSelection.selectionStart;\n this.hiddenTextarea.selectionEnd = newSelection.selectionEnd;\n }\n this.updateTextareaPosition();\n },\n\n /**\n * @private\n */\n updateFromTextArea: function() {\n if (!this.hiddenTextarea) {\n return;\n }\n this.cursorOffsetCache = { };\n this.text = this.hiddenTextarea.value;\n if (this._shouldClearDimensionCache()) {\n this.initDimensions();\n this.setCoords();\n }\n var newSelection = this.fromStringToGraphemeSelection(\n this.hiddenTextarea.selectionStart, this.hiddenTextarea.selectionEnd, this.hiddenTextarea.value);\n this.selectionEnd = this.selectionStart = newSelection.selectionEnd;\n if (!this.inCompositionMode) {\n this.selectionStart = newSelection.selectionStart;\n }\n this.updateTextareaPosition();\n },\n\n /**\n * @private\n */\n updateTextareaPosition: function() {\n if (this.selectionStart === this.selectionEnd) {\n var style = this._calcTextareaPosition();\n this.hiddenTextarea.style.left = style.left;\n this.hiddenTextarea.style.top = style.top;\n }\n },\n\n /**\n * @private\n * @return {Object} style contains style for hiddenTextarea\n */\n _calcTextareaPosition: function() {\n if (!this.canvas) {\n return { x: 1, y: 1 };\n }\n var desiredPosition = this.inCompositionMode ? this.compositionStart : this.selectionStart,\n boundaries = this._getCursorBoundaries(desiredPosition),\n cursorLocation = this.get2DCursorLocation(desiredPosition),\n lineIndex = cursorLocation.lineIndex,\n charIndex = cursorLocation.charIndex,\n charHeight = this.getValueOfPropertyAt(lineIndex, charIndex, 'fontSize') * this.lineHeight,\n leftOffset = boundaries.leftOffset,\n m = this.calcTransformMatrix(),\n p = {\n x: boundaries.left + leftOffset,\n y: boundaries.top + boundaries.topOffset + charHeight\n },\n retinaScaling = this.canvas.getRetinaScaling(),\n upperCanvas = this.canvas.upperCanvasEl,\n upperCanvasWidth = upperCanvas.width / retinaScaling,\n upperCanvasHeight = upperCanvas.height / retinaScaling,\n maxWidth = upperCanvasWidth - charHeight,\n maxHeight = upperCanvasHeight - charHeight,\n scaleX = upperCanvas.clientWidth / upperCanvasWidth,\n scaleY = upperCanvas.clientHeight / upperCanvasHeight;\n\n p = fabric.util.transformPoint(p, m);\n p = fabric.util.transformPoint(p, this.canvas.viewportTransform);\n p.x *= scaleX;\n p.y *= scaleY;\n if (p.x < 0) {\n p.x = 0;\n }\n if (p.x > maxWidth) {\n p.x = maxWidth;\n }\n if (p.y < 0) {\n p.y = 0;\n }\n if (p.y > maxHeight) {\n p.y = maxHeight;\n }\n\n // add canvas offset on document\n p.x += this.canvas._offset.left;\n p.y += this.canvas._offset.top;\n\n return { left: p.x + 'px', top: p.y + 'px', fontSize: charHeight + 'px', charHeight: charHeight };\n },\n\n /**\n * @private\n */\n _saveEditingProps: function() {\n this._savedProps = {\n hasControls: this.hasControls,\n borderColor: this.borderColor,\n lockMovementX: this.lockMovementX,\n lockMovementY: this.lockMovementY,\n hoverCursor: this.hoverCursor,\n selectable: this.selectable,\n defaultCursor: this.canvas && this.canvas.defaultCursor,\n moveCursor: this.canvas && this.canvas.moveCursor\n };\n },\n\n /**\n * @private\n */\n _restoreEditingProps: function() {\n if (!this._savedProps) {\n return;\n }\n\n this.hoverCursor = this._savedProps.hoverCursor;\n this.hasControls = this._savedProps.hasControls;\n this.borderColor = this._savedProps.borderColor;\n this.selectable = this._savedProps.selectable;\n this.lockMovementX = this._savedProps.lockMovementX;\n this.lockMovementY = this._savedProps.lockMovementY;\n\n if (this.canvas) {\n this.canvas.defaultCursor = this._savedProps.defaultCursor;\n this.canvas.moveCursor = this._savedProps.moveCursor;\n }\n },\n\n /**\n * Exits from editing state\n * @return {fabric.IText} thisArg\n * @chainable\n */\n exitEditing: function() {\n var isTextChanged = (this._textBeforeEdit !== this.text);\n var hiddenTextarea = this.hiddenTextarea;\n this.selected = false;\n this.isEditing = false;\n\n this.selectionEnd = this.selectionStart;\n\n if (hiddenTextarea) {\n hiddenTextarea.blur && hiddenTextarea.blur();\n hiddenTextarea.parentNode && hiddenTextarea.parentNode.removeChild(hiddenTextarea);\n }\n this.hiddenTextarea = null;\n this.abortCursorAnimation();\n this._restoreEditingProps();\n this._currentCursorOpacity = 0;\n if (this._shouldClearDimensionCache()) {\n this.initDimensions();\n this.setCoords();\n }\n this.fire('editing:exited');\n isTextChanged && this.fire('modified');\n if (this.canvas) {\n this.canvas.off('mouse:move', this.mouseMoveHandler);\n this.canvas.fire('text:editing:exited', { target: this });\n isTextChanged && this.canvas.fire('object:modified', { target: this });\n }\n return this;\n },\n\n /**\n * @private\n */\n _removeExtraneousStyles: function() {\n for (var prop in this.styles) {\n if (!this._textLines[prop]) {\n delete this.styles[prop];\n }\n }\n },\n\n /**\n * remove and reflow a style block from start to end.\n * @param {Number} start linear start position for removal (included in removal)\n * @param {Number} end linear end position for removal ( excluded from removal )\n */\n removeStyleFromTo: function(start, end) {\n var cursorStart = this.get2DCursorLocation(start, true),\n cursorEnd = this.get2DCursorLocation(end, true),\n lineStart = cursorStart.lineIndex,\n charStart = cursorStart.charIndex,\n lineEnd = cursorEnd.lineIndex,\n charEnd = cursorEnd.charIndex,\n i, styleObj;\n if (lineStart !== lineEnd) {\n // step1 remove the trailing of lineStart\n if (this.styles[lineStart]) {\n for (i = charStart; i < this._unwrappedTextLines[lineStart].length; i++) {\n delete this.styles[lineStart][i];\n }\n }\n // step2 move the trailing of lineEnd to lineStart if needed\n if (this.styles[lineEnd]) {\n for (i = charEnd; i < this._unwrappedTextLines[lineEnd].length; i++) {\n styleObj = this.styles[lineEnd][i];\n if (styleObj) {\n this.styles[lineStart] || (this.styles[lineStart] = { });\n this.styles[lineStart][charStart + i - charEnd] = styleObj;\n }\n }\n }\n // step3 detects lines will be completely removed.\n for (i = lineStart + 1; i <= lineEnd; i++) {\n delete this.styles[i];\n }\n // step4 shift remaining lines.\n this.shiftLineStyles(lineEnd, lineStart - lineEnd);\n }\n else {\n // remove and shift left on the same line\n if (this.styles[lineStart]) {\n styleObj = this.styles[lineStart];\n var diff = charEnd - charStart, numericChar, _char;\n for (i = charStart; i < charEnd; i++) {\n delete styleObj[i];\n }\n for (_char in this.styles[lineStart]) {\n numericChar = parseInt(_char, 10);\n if (numericChar >= charEnd) {\n styleObj[numericChar - diff] = styleObj[_char];\n delete styleObj[_char];\n }\n }\n }\n }\n },\n\n /**\n * Shifts line styles up or down\n * @param {Number} lineIndex Index of a line\n * @param {Number} offset Can any number?\n */\n shiftLineStyles: function(lineIndex, offset) {\n // shift all line styles by offset upward or downward\n // do not clone deep. we need new array, not new style objects\n var clonedStyles = clone(this.styles);\n for (var line in this.styles) {\n var numericLine = parseInt(line, 10);\n if (numericLine > lineIndex) {\n this.styles[numericLine + offset] = clonedStyles[numericLine];\n if (!clonedStyles[numericLine - offset]) {\n delete this.styles[numericLine];\n }\n }\n }\n },\n\n restartCursorIfNeeded: function() {\n if (!this._currentTickState || this._currentTickState.isAborted\n || !this._currentTickCompleteState || this._currentTickCompleteState.isAborted\n ) {\n this.initDelayedCursor();\n }\n },\n\n /**\n * Handle insertion of more consecutive style lines for when one or more\n * newlines gets added to the text. Since current style needs to be shifted\n * first we shift the current style of the number lines needed, then we add\n * new lines from the last to the first.\n * @param {Number} lineIndex Index of a line\n * @param {Number} charIndex Index of a char\n * @param {Number} qty number of lines to add\n * @param {Array} copiedStyle Array of objects styles\n */\n insertNewlineStyleObject: function(lineIndex, charIndex, qty, copiedStyle) {\n var currentCharStyle,\n newLineStyles = {},\n somethingAdded = false,\n isEndOfLine = this._unwrappedTextLines[lineIndex].length === charIndex;\n\n qty || (qty = 1);\n this.shiftLineStyles(lineIndex, qty);\n if (this.styles[lineIndex]) {\n currentCharStyle = this.styles[lineIndex][charIndex === 0 ? charIndex : charIndex - 1];\n }\n // we clone styles of all chars\n // after cursor onto the current line\n for (var index in this.styles[lineIndex]) {\n var numIndex = parseInt(index, 10);\n if (numIndex >= charIndex) {\n somethingAdded = true;\n newLineStyles[numIndex - charIndex] = this.styles[lineIndex][index];\n // remove lines from the previous line since they're on a new line now\n if (!(isEndOfLine && charIndex === 0)) {\n delete this.styles[lineIndex][index];\n }\n }\n }\n var styleCarriedOver = false;\n if (somethingAdded && !isEndOfLine) {\n // if is end of line, the extra style we copied\n // is probably not something we want\n this.styles[lineIndex + qty] = newLineStyles;\n styleCarriedOver = true;\n }\n if (styleCarriedOver) {\n // skip the last line of since we already prepared it.\n qty--;\n }\n // for the all the lines or all the other lines\n // we clone current char style onto the next (otherwise empty) line\n while (qty > 0) {\n if (copiedStyle && copiedStyle[qty - 1]) {\n this.styles[lineIndex + qty] = { 0: clone(copiedStyle[qty - 1]) };\n }\n else if (currentCharStyle) {\n this.styles[lineIndex + qty] = { 0: clone(currentCharStyle) };\n }\n else {\n delete this.styles[lineIndex + qty];\n }\n qty--;\n }\n this._forceClearCache = true;\n },\n\n /**\n * Inserts style object for a given line/char index\n * @param {Number} lineIndex Index of a line\n * @param {Number} charIndex Index of a char\n * @param {Number} quantity number Style object to insert, if given\n * @param {Array} copiedStyle array of style objects\n */\n insertCharStyleObject: function(lineIndex, charIndex, quantity, copiedStyle) {\n if (!this.styles) {\n this.styles = {};\n }\n var currentLineStyles = this.styles[lineIndex],\n currentLineStylesCloned = currentLineStyles ? clone(currentLineStyles) : {};\n\n quantity || (quantity = 1);\n // shift all char styles by quantity forward\n // 0,1,2,3 -> (charIndex=2) -> 0,1,3,4 -> (insert 2) -> 0,1,2,3,4\n for (var index in currentLineStylesCloned) {\n var numericIndex = parseInt(index, 10);\n if (numericIndex >= charIndex) {\n currentLineStyles[numericIndex + quantity] = currentLineStylesCloned[numericIndex];\n // only delete the style if there was nothing moved there\n if (!currentLineStylesCloned[numericIndex - quantity]) {\n delete currentLineStyles[numericIndex];\n }\n }\n }\n this._forceClearCache = true;\n if (copiedStyle) {\n while (quantity--) {\n if (!Object.keys(copiedStyle[quantity]).length) {\n continue;\n }\n if (!this.styles[lineIndex]) {\n this.styles[lineIndex] = {};\n }\n this.styles[lineIndex][charIndex + quantity] = clone(copiedStyle[quantity]);\n }\n return;\n }\n if (!currentLineStyles) {\n return;\n }\n var newStyle = currentLineStyles[charIndex ? charIndex - 1 : 1];\n while (newStyle && quantity--) {\n this.styles[lineIndex][charIndex + quantity] = clone(newStyle);\n }\n },\n\n /**\n * Inserts style object(s)\n * @param {Array} insertedText Characters at the location where style is inserted\n * @param {Number} start cursor index for inserting style\n * @param {Array} [copiedStyle] array of style objects to insert.\n */\n insertNewStyleBlock: function(insertedText, start, copiedStyle) {\n var cursorLoc = this.get2DCursorLocation(start, true),\n addedLines = [0], linesLength = 0;\n // get an array of how many char per lines are being added.\n for (var i = 0; i < insertedText.length; i++) {\n if (insertedText[i] === '\\n') {\n linesLength++;\n addedLines[linesLength] = 0;\n }\n else {\n addedLines[linesLength]++;\n }\n }\n // for the first line copy the style from the current char position.\n if (addedLines[0] > 0) {\n this.insertCharStyleObject(cursorLoc.lineIndex, cursorLoc.charIndex, addedLines[0], copiedStyle);\n copiedStyle = copiedStyle && copiedStyle.slice(addedLines[0] + 1);\n }\n linesLength && this.insertNewlineStyleObject(\n cursorLoc.lineIndex, cursorLoc.charIndex + addedLines[0], linesLength);\n for (var i = 1; i < linesLength; i++) {\n if (addedLines[i] > 0) {\n this.insertCharStyleObject(cursorLoc.lineIndex + i, 0, addedLines[i], copiedStyle);\n }\n else if (copiedStyle) {\n this.styles[cursorLoc.lineIndex + i][0] = copiedStyle[0];\n }\n copiedStyle = copiedStyle && copiedStyle.slice(addedLines[i] + 1);\n }\n // we use i outside the loop to get it like linesLength\n if (addedLines[i] > 0) {\n this.insertCharStyleObject(cursorLoc.lineIndex + i, 0, addedLines[i], copiedStyle);\n }\n },\n\n /**\n * Set the selectionStart and selectionEnd according to the new position of cursor\n * mimic the key - mouse navigation when shift is pressed.\n */\n setSelectionStartEndWithShift: function(start, end, newSelection) {\n if (newSelection <= start) {\n if (end === start) {\n this._selectionDirection = 'left';\n }\n else if (this._selectionDirection === 'right') {\n this._selectionDirection = 'left';\n this.selectionEnd = start;\n }\n this.selectionStart = newSelection;\n }\n else if (newSelection > start && newSelection < end) {\n if (this._selectionDirection === 'right') {\n this.selectionEnd = newSelection;\n }\n else {\n this.selectionStart = newSelection;\n }\n }\n else {\n // newSelection is > selection start and end\n if (end === start) {\n this._selectionDirection = 'right';\n }\n else if (this._selectionDirection === 'left') {\n this._selectionDirection = 'right';\n this.selectionStart = end;\n }\n this.selectionEnd = newSelection;\n }\n },\n\n setSelectionInBoundaries: function() {\n var length = this.text.length;\n if (this.selectionStart > length) {\n this.selectionStart = length;\n }\n else if (this.selectionStart < 0) {\n this.selectionStart = 0;\n }\n if (this.selectionEnd > length) {\n this.selectionEnd = length;\n }\n else if (this.selectionEnd < 0) {\n this.selectionEnd = 0;\n }\n }\n });\n})();\n\n\nfabric.util.object.extend(fabric.IText.prototype, /** @lends fabric.IText.prototype */ {\n /**\n * Initializes \"dbclick\" event handler\n */\n initDoubleClickSimulation: function() {\n\n // for double click\n this.__lastClickTime = +new Date();\n\n // for triple click\n this.__lastLastClickTime = +new Date();\n\n this.__lastPointer = { };\n\n this.on('mousedown', this.onMouseDown);\n },\n\n /**\n * Default event handler to simulate triple click\n * @private\n */\n onMouseDown: function(options) {\n if (!this.canvas) {\n return;\n }\n this.__newClickTime = +new Date();\n var newPointer = options.pointer;\n if (this.isTripleClick(newPointer)) {\n this.fire('tripleclick', options);\n this._stopEvent(options.e);\n }\n this.__lastLastClickTime = this.__lastClickTime;\n this.__lastClickTime = this.__newClickTime;\n this.__lastPointer = newPointer;\n this.__lastIsEditing = this.isEditing;\n this.__lastSelected = this.selected;\n },\n\n isTripleClick: function(newPointer) {\n return this.__newClickTime - this.__lastClickTime < 500 &&\n this.__lastClickTime - this.__lastLastClickTime < 500 &&\n this.__lastPointer.x === newPointer.x &&\n this.__lastPointer.y === newPointer.y;\n },\n\n /**\n * @private\n */\n _stopEvent: function(e) {\n e.preventDefault && e.preventDefault();\n e.stopPropagation && e.stopPropagation();\n },\n\n /**\n * Initializes event handlers related to cursor or selection\n */\n initCursorSelectionHandlers: function() {\n this.initMousedownHandler();\n this.initMouseupHandler();\n this.initClicks();\n },\n\n /**\n * Default handler for double click, select a word\n */\n doubleClickHandler: function(options) {\n if (!this.isEditing) {\n return;\n }\n this.selectWord(this.getSelectionStartFromPointer(options.e));\n },\n\n /**\n * Default handler for triple click, select a line\n */\n tripleClickHandler: function(options) {\n if (!this.isEditing) {\n return;\n }\n this.selectLine(this.getSelectionStartFromPointer(options.e));\n },\n\n /**\n * Initializes double and triple click event handlers\n */\n initClicks: function() {\n this.on('mousedblclick', this.doubleClickHandler);\n this.on('tripleclick', this.tripleClickHandler);\n },\n\n /**\n * Default event handler for the basic functionalities needed on _mouseDown\n * can be overridden to do something different.\n * Scope of this implementation is: find the click position, set selectionStart\n * find selectionEnd, initialize the drawing of either cursor or selection area\n * initializing a mousedDown on a text area will cancel fabricjs knowledge of\n * current compositionMode. It will be set to false.\n */\n _mouseDownHandler: function(options) {\n if (!this.canvas || !this.editable || (options.e.button && options.e.button !== 1)) {\n return;\n }\n\n this.__isMousedown = true;\n\n if (this.selected) {\n this.inCompositionMode = false;\n this.setCursorByClick(options.e);\n }\n\n if (this.isEditing) {\n this.__selectionStartOnMouseDown = this.selectionStart;\n if (this.selectionStart === this.selectionEnd) {\n this.abortCursorAnimation();\n }\n this.renderCursorOrSelection();\n }\n },\n\n /**\n * Default event handler for the basic functionalities needed on mousedown:before\n * can be overridden to do something different.\n * Scope of this implementation is: verify the object is already selected when mousing down\n */\n _mouseDownHandlerBefore: function(options) {\n if (!this.canvas || !this.editable || (options.e.button && options.e.button !== 1)) {\n return;\n }\n // we want to avoid that an object that was selected and then becomes unselectable,\n // may trigger editing mode in some way.\n this.selected = this === this.canvas._activeObject;\n },\n\n /**\n * Initializes \"mousedown\" event handler\n */\n initMousedownHandler: function() {\n this.on('mousedown', this._mouseDownHandler);\n this.on('mousedown:before', this._mouseDownHandlerBefore);\n },\n\n /**\n * Initializes \"mouseup\" event handler\n */\n initMouseupHandler: function() {\n this.on('mouseup', this.mouseUpHandler);\n },\n\n /**\n * standard hander for mouse up, overridable\n * @private\n */\n mouseUpHandler: function(options) {\n this.__isMousedown = false;\n if (!this.editable || this.group ||\n (options.transform && options.transform.actionPerformed) ||\n (options.e.button && options.e.button !== 1)) {\n return;\n }\n\n if (this.canvas) {\n var currentActive = this.canvas._activeObject;\n if (currentActive && currentActive !== this) {\n // avoid running this logic when there is an active object\n // this because is possible with shift click and fast clicks,\n // to rapidly deselect and reselect this object and trigger an enterEdit\n return;\n }\n }\n\n if (this.__lastSelected && !this.__corner) {\n this.selected = false;\n this.__lastSelected = false;\n this.enterEditing(options.e);\n if (this.selectionStart === this.selectionEnd) {\n this.initDelayedCursor(true);\n }\n else {\n this.renderCursorOrSelection();\n }\n }\n else {\n this.selected = true;\n }\n },\n\n /**\n * Changes cursor location in a text depending on passed pointer (x/y) object\n * @param {Event} e Event object\n */\n setCursorByClick: function(e) {\n var newSelection = this.getSelectionStartFromPointer(e),\n start = this.selectionStart, end = this.selectionEnd;\n if (e.shiftKey) {\n this.setSelectionStartEndWithShift(start, end, newSelection);\n }\n else {\n this.selectionStart = newSelection;\n this.selectionEnd = newSelection;\n }\n if (this.isEditing) {\n this._fireSelectionChanged();\n this._updateTextarea();\n }\n },\n\n /**\n * Returns index of a character corresponding to where an object was clicked\n * @param {Event} e Event object\n * @return {Number} Index of a character\n */\n getSelectionStartFromPointer: function(e) {\n var mouseOffset = this.getLocalPointer(e),\n prevWidth = 0,\n width = 0,\n height = 0,\n charIndex = 0,\n lineIndex = 0,\n lineLeftOffset,\n line;\n\n for (var i = 0, len = this._textLines.length; i < len; i++) {\n if (height <= mouseOffset.y) {\n height += this.getHeightOfLine(i) * this.scaleY;\n lineIndex = i;\n if (i > 0) {\n charIndex += this._textLines[i - 1].length + this.missingNewlineOffset(i - 1);\n }\n }\n else {\n break;\n }\n }\n lineLeftOffset = this._getLineLeftOffset(lineIndex);\n width = lineLeftOffset * this.scaleX;\n line = this._textLines[lineIndex];\n for (var j = 0, jlen = line.length; j < jlen; j++) {\n prevWidth = width;\n // i removed something about flipX here, check.\n width += this.__charBounds[lineIndex][j].kernedWidth * this.scaleX;\n if (width <= mouseOffset.x) {\n charIndex++;\n }\n else {\n break;\n }\n }\n return this._getNewSelectionStartFromOffset(mouseOffset, prevWidth, width, charIndex, jlen);\n },\n\n /**\n * @private\n */\n _getNewSelectionStartFromOffset: function(mouseOffset, prevWidth, width, index, jlen) {\n // we need Math.abs because when width is after the last char, the offset is given as 1, while is 0\n var distanceBtwLastCharAndCursor = mouseOffset.x - prevWidth,\n distanceBtwNextCharAndCursor = width - mouseOffset.x,\n offset = distanceBtwNextCharAndCursor > distanceBtwLastCharAndCursor ||\n distanceBtwNextCharAndCursor < 0 ? 0 : 1,\n newSelectionStart = index + offset;\n // if object is horizontally flipped, mirror cursor location from the end\n if (this.flipX) {\n newSelectionStart = jlen - newSelectionStart;\n }\n\n if (newSelectionStart > this._text.length) {\n newSelectionStart = this._text.length;\n }\n\n return newSelectionStart;\n }\n});\n\n\nfabric.util.object.extend(fabric.IText.prototype, /** @lends fabric.IText.prototype */ {\n\n /**\n * Initializes hidden textarea (needed to bring up keyboard in iOS)\n */\n initHiddenTextarea: function() {\n this.hiddenTextarea = fabric.document.createElement('textarea');\n this.hiddenTextarea.setAttribute('autocapitalize', 'off');\n this.hiddenTextarea.setAttribute('autocorrect', 'off');\n this.hiddenTextarea.setAttribute('autocomplete', 'off');\n this.hiddenTextarea.setAttribute('spellcheck', 'false');\n this.hiddenTextarea.setAttribute('data-fabric-hiddentextarea', '');\n this.hiddenTextarea.setAttribute('wrap', 'off');\n var style = this._calcTextareaPosition();\n // line-height: 1px; was removed from the style to fix this:\n // https://bugs.chromium.org/p/chromium/issues/detail?id=870966\n this.hiddenTextarea.style.cssText = 'position: absolute; top: ' + style.top +\n '; left: ' + style.left + '; z-index: -999; opacity: 0; width: 1px; height: 1px; font-size: 1px;' +\n ' paddingｰtop: ' + style.fontSize + ';';\n fabric.document.body.appendChild(this.hiddenTextarea);\n\n fabric.util.addListener(this.hiddenTextarea, 'keydown', this.onKeyDown.bind(this));\n fabric.util.addListener(this.hiddenTextarea, 'keyup', this.onKeyUp.bind(this));\n fabric.util.addListener(this.hiddenTextarea, 'input', this.onInput.bind(this));\n fabric.util.addListener(this.hiddenTextarea, 'copy', this.copy.bind(this));\n fabric.util.addListener(this.hiddenTextarea, 'cut', this.copy.bind(this));\n fabric.util.addListener(this.hiddenTextarea, 'paste', this.paste.bind(this));\n fabric.util.addListener(this.hiddenTextarea, 'compositionstart', this.onCompositionStart.bind(this));\n fabric.util.addListener(this.hiddenTextarea, 'compositionupdate', this.onCompositionUpdate.bind(this));\n fabric.util.addListener(this.hiddenTextarea, 'compositionend', this.onCompositionEnd.bind(this));\n\n if (!this._clickHandlerInitialized && this.canvas) {\n fabric.util.addListener(this.canvas.upperCanvasEl, 'click', this.onClick.bind(this));\n this._clickHandlerInitialized = true;\n }\n },\n\n /**\n * For functionalities on keyDown\n * Map a special key to a function of the instance/prototype\n * If you need different behaviour for ESC or TAB or arrows, you have to change\n * this map setting the name of a function that you build on the fabric.Itext or\n * your prototype.\n * the map change will affect all Instances unless you need for only some text Instances\n * in that case you have to clone this object and assign your Instance.\n * this.keysMap = fabric.util.object.clone(this.keysMap);\n * The function must be in fabric.Itext.prototype.myFunction And will receive event as args[0]\n */\n keysMap: {\n 9: 'exitEditing',\n 27: 'exitEditing',\n 33: 'moveCursorUp',\n 34: 'moveCursorDown',\n 35: 'moveCursorRight',\n 36: 'moveCursorLeft',\n 37: 'moveCursorLeft',\n 38: 'moveCursorUp',\n 39: 'moveCursorRight',\n 40: 'moveCursorDown',\n },\n\n /**\n * For functionalities on keyUp + ctrl || cmd\n */\n ctrlKeysMapUp: {\n 67: 'copy',\n 88: 'cut'\n },\n\n /**\n * For functionalities on keyDown + ctrl || cmd\n */\n ctrlKeysMapDown: {\n 65: 'selectAll'\n },\n\n onClick: function() {\n // No need to trigger click event here, focus is enough to have the keyboard appear on Android\n this.hiddenTextarea && this.hiddenTextarea.focus();\n },\n\n /**\n * Handles keydown event\n * only used for arrows and combination of modifier keys.\n * @param {Event} e Event object\n */\n onKeyDown: function(e) {\n if (!this.isEditing) {\n return;\n }\n if (e.keyCode in this.keysMap) {\n this[this.keysMap[e.keyCode]](e);\n }\n else if ((e.keyCode in this.ctrlKeysMapDown) && (e.ctrlKey || e.metaKey)) {\n this[this.ctrlKeysMapDown[e.keyCode]](e);\n }\n else {\n return;\n }\n e.stopImmediatePropagation();\n e.preventDefault();\n if (e.keyCode >= 33 && e.keyCode <= 40) {\n // if i press an arrow key just update selection\n this.inCompositionMode = false;\n this.clearContextTop();\n this.renderCursorOrSelection();\n }\n else {\n this.canvas && this.canvas.requestRenderAll();\n }\n },\n\n /**\n * Handles keyup event\n * We handle KeyUp because ie11 and edge have difficulties copy/pasting\n * if a copy/cut event fired, keyup is dismissed\n * @param {Event} e Event object\n */\n onKeyUp: function(e) {\n if (!this.isEditing || this._copyDone || this.inCompositionMode) {\n this._copyDone = false;\n return;\n }\n if ((e.keyCode in this.ctrlKeysMapUp) && (e.ctrlKey || e.metaKey)) {\n this[this.ctrlKeysMapUp[e.keyCode]](e);\n }\n else {\n return;\n }\n e.stopImmediatePropagation();\n e.preventDefault();\n this.canvas && this.canvas.requestRenderAll();\n },\n\n /**\n * Handles onInput event\n * @param {Event} e Event object\n */\n onInput: function(e) {\n var fromPaste = this.fromPaste;\n this.fromPaste = false;\n e && e.stopPropagation();\n if (!this.isEditing) {\n return;\n }\n // decisions about style changes.\n var nextText = this._splitTextIntoLines(this.hiddenTextarea.value).graphemeText,\n charCount = this._text.length,\n nextCharCount = nextText.length,\n removedText, insertedText,\n charDiff = nextCharCount - charCount,\n selectionStart = this.selectionStart, selectionEnd = this.selectionEnd,\n selection = selectionStart !== selectionEnd,\n copiedStyle, removeFrom, removeTo;\n if (this.hiddenTextarea.value === '') {\n this.styles = { };\n this.updateFromTextArea();\n this.fire('changed');\n if (this.canvas) {\n this.canvas.fire('text:changed', { target: this });\n this.canvas.requestRenderAll();\n }\n return;\n }\n\n var textareaSelection = this.fromStringToGraphemeSelection(\n this.hiddenTextarea.selectionStart,\n this.hiddenTextarea.selectionEnd,\n this.hiddenTextarea.value\n );\n var backDelete = selectionStart > textareaSelection.selectionStart;\n\n if (selection) {\n removedText = this._text.slice(selectionStart, selectionEnd);\n charDiff += selectionEnd - selectionStart;\n }\n else if (nextCharCount < charCount) {\n if (backDelete) {\n removedText = this._text.slice(selectionEnd + charDiff, selectionEnd);\n }\n else {\n removedText = this._text.slice(selectionStart, selectionStart - charDiff);\n }\n }\n insertedText = nextText.slice(textareaSelection.selectionEnd - charDiff, textareaSelection.selectionEnd);\n if (removedText && removedText.length) {\n if (insertedText.length) {\n // let's copy some style before deleting.\n // we want to copy the style before the cursor OR the style at the cursor if selection\n // is bigger than 0.\n copiedStyle = this.getSelectionStyles(selectionStart, selectionStart + 1, false);\n // now duplicate the style one for each inserted text.\n copiedStyle = insertedText.map(function() {\n // this return an array of references, but that is fine since we are\n // copying the style later.\n return copiedStyle[0];\n });\n }\n if (selection) {\n removeFrom = selectionStart;\n removeTo = selectionEnd;\n }\n else if (backDelete) {\n // detect differencies between forwardDelete and backDelete\n removeFrom = selectionEnd - removedText.length;\n removeTo = selectionEnd;\n }\n else {\n removeFrom = selectionEnd;\n removeTo = selectionEnd + removedText.length;\n }\n this.removeStyleFromTo(removeFrom, removeTo);\n }\n if (insertedText.length) {\n if (fromPaste && insertedText.join('') === fabric.copiedText && !fabric.disableStyleCopyPaste) {\n copiedStyle = fabric.copiedTextStyle;\n }\n this.insertNewStyleBlock(insertedText, selectionStart, copiedStyle);\n }\n this.updateFromTextArea();\n this.fire('changed');\n if (this.canvas) {\n this.canvas.fire('text:changed', { target: this });\n this.canvas.requestRenderAll();\n }\n },\n /**\n * Composition start\n */\n onCompositionStart: function() {\n this.inCompositionMode = true;\n },\n\n /**\n * Composition end\n */\n onCompositionEnd: function() {\n this.inCompositionMode = false;\n },\n\n // /**\n // * Composition update\n // */\n onCompositionUpdate: function(e) {\n this.compositionStart = e.target.selectionStart;\n this.compositionEnd = e.target.selectionEnd;\n this.updateTextareaPosition();\n },\n\n /**\n * Copies selected text\n * @param {Event} e Event object\n */\n copy: function() {\n if (this.selectionStart === this.selectionEnd) {\n //do not cut-copy if no selection\n return;\n }\n\n fabric.copiedText = this.getSelectedText();\n if (!fabric.disableStyleCopyPaste) {\n fabric.copiedTextStyle = this.getSelectionStyles(this.selectionStart, this.selectionEnd, true);\n }\n else {\n fabric.copiedTextStyle = null;\n }\n this._copyDone = true;\n },\n\n /**\n * Pastes text\n * @param {Event} e Event object\n */\n paste: function() {\n this.fromPaste = true;\n },\n\n /**\n * @private\n * @param {Event} e Event object\n * @return {Object} Clipboard data object\n */\n _getClipboardData: function(e) {\n return (e && e.clipboardData) || fabric.window.clipboardData;\n },\n\n /**\n * Finds the width in pixels before the cursor on the same line\n * @private\n * @param {Number} lineIndex\n * @param {Number} charIndex\n * @return {Number} widthBeforeCursor width before cursor\n */\n _getWidthBeforeCursor: function(lineIndex, charIndex) {\n var widthBeforeCursor = this._getLineLeftOffset(lineIndex), bound;\n\n if (charIndex > 0) {\n bound = this.__charBounds[lineIndex][charIndex - 1];\n widthBeforeCursor += bound.left + bound.width;\n }\n return widthBeforeCursor;\n },\n\n /**\n * Gets start offset of a selection\n * @param {Event} e Event object\n * @param {Boolean} isRight\n * @return {Number}\n */\n getDownCursorOffset: function(e, isRight) {\n var selectionProp = this._getSelectionForOffset(e, isRight),\n cursorLocation = this.get2DCursorLocation(selectionProp),\n lineIndex = cursorLocation.lineIndex;\n // if on last line, down cursor goes to end of line\n if (lineIndex === this._textLines.length - 1 || e.metaKey || e.keyCode === 34) {\n // move to the end of a text\n return this._text.length - selectionProp;\n }\n var charIndex = cursorLocation.charIndex,\n widthBeforeCursor = this._getWidthBeforeCursor(lineIndex, charIndex),\n indexOnOtherLine = this._getIndexOnLine(lineIndex + 1, widthBeforeCursor),\n textAfterCursor = this._textLines[lineIndex].slice(charIndex);\n return textAfterCursor.length + indexOnOtherLine + 1 + this.missingNewlineOffset(lineIndex);\n },\n\n /**\n * private\n * Helps finding if the offset should be counted from Start or End\n * @param {Event} e Event object\n * @param {Boolean} isRight\n * @return {Number}\n */\n _getSelectionForOffset: function(e, isRight) {\n if (e.shiftKey && this.selectionStart !== this.selectionEnd && isRight) {\n return this.selectionEnd;\n }\n else {\n return this.selectionStart;\n }\n },\n\n /**\n * @param {Event} e Event object\n * @param {Boolean} isRight\n * @return {Number}\n */\n getUpCursorOffset: function(e, isRight) {\n var selectionProp = this._getSelectionForOffset(e, isRight),\n cursorLocation = this.get2DCursorLocation(selectionProp),\n lineIndex = cursorLocation.lineIndex;\n if (lineIndex === 0 || e.metaKey || e.keyCode === 33) {\n // if on first line, up cursor goes to start of line\n return -selectionProp;\n }\n var charIndex = cursorLocation.charIndex,\n widthBeforeCursor = this._getWidthBeforeCursor(lineIndex, charIndex),\n indexOnOtherLine = this._getIndexOnLine(lineIndex - 1, widthBeforeCursor),\n textBeforeCursor = this._textLines[lineIndex].slice(0, charIndex),\n missingNewlineOffset = this.missingNewlineOffset(lineIndex - 1);\n // return a negative offset\n return -this._textLines[lineIndex - 1].length\n + indexOnOtherLine - textBeforeCursor.length + (1 - missingNewlineOffset);\n },\n\n /**\n * for a given width it founds the matching character.\n * @private\n */\n _getIndexOnLine: function(lineIndex, width) {\n\n var line = this._textLines[lineIndex],\n lineLeftOffset = this._getLineLeftOffset(lineIndex),\n widthOfCharsOnLine = lineLeftOffset,\n indexOnLine = 0, charWidth, foundMatch;\n\n for (var j = 0, jlen = line.length; j < jlen; j++) {\n charWidth = this.__charBounds[lineIndex][j].width;\n widthOfCharsOnLine += charWidth;\n if (widthOfCharsOnLine > width) {\n foundMatch = true;\n var leftEdge = widthOfCharsOnLine - charWidth,\n rightEdge = widthOfCharsOnLine,\n offsetFromLeftEdge = Math.abs(leftEdge - width),\n offsetFromRightEdge = Math.abs(rightEdge - width);\n\n indexOnLine = offsetFromRightEdge < offsetFromLeftEdge ? j : (j - 1);\n break;\n }\n }\n\n // reached end\n if (!foundMatch) {\n indexOnLine = line.length - 1;\n }\n\n return indexOnLine;\n },\n\n\n /**\n * Moves cursor down\n * @param {Event} e Event object\n */\n moveCursorDown: function(e) {\n if (this.selectionStart >= this._text.length && this.selectionEnd >= this._text.length) {\n return;\n }\n this._moveCursorUpOrDown('Down', e);\n },\n\n /**\n * Moves cursor up\n * @param {Event} e Event object\n */\n moveCursorUp: function(e) {\n if (this.selectionStart === 0 && this.selectionEnd === 0) {\n return;\n }\n this._moveCursorUpOrDown('Up', e);\n },\n\n /**\n * Moves cursor up or down, fires the events\n * @param {String} direction 'Up' or 'Down'\n * @param {Event} e Event object\n */\n _moveCursorUpOrDown: function(direction, e) {\n // getUpCursorOffset\n // getDownCursorOffset\n var action = 'get' + direction + 'CursorOffset',\n offset = this[action](e, this._selectionDirection === 'right');\n if (e.shiftKey) {\n this.moveCursorWithShift(offset);\n }\n else {\n this.moveCursorWithoutShift(offset);\n }\n if (offset !== 0) {\n this.setSelectionInBoundaries();\n this.abortCursorAnimation();\n this._currentCursorOpacity = 1;\n this.initDelayedCursor();\n this._fireSelectionChanged();\n this._updateTextarea();\n }\n },\n\n /**\n * Moves cursor with shift\n * @param {Number} offset\n */\n moveCursorWithShift: function(offset) {\n var newSelection = this._selectionDirection === 'left'\n ? this.selectionStart + offset\n : this.selectionEnd + offset;\n this.setSelectionStartEndWithShift(this.selectionStart, this.selectionEnd, newSelection);\n return offset !== 0;\n },\n\n /**\n * Moves cursor up without shift\n * @param {Number} offset\n */\n moveCursorWithoutShift: function(offset) {\n if (offset < 0) {\n this.selectionStart += offset;\n this.selectionEnd = this.selectionStart;\n }\n else {\n this.selectionEnd += offset;\n this.selectionStart = this.selectionEnd;\n }\n return offset !== 0;\n },\n\n /**\n * Moves cursor left\n * @param {Event} e Event object\n */\n moveCursorLeft: function(e) {\n if (this.selectionStart === 0 && this.selectionEnd === 0) {\n return;\n }\n this._moveCursorLeftOrRight('Left', e);\n },\n\n /**\n * @private\n * @return {Boolean} true if a change happened\n */\n _move: function(e, prop, direction) {\n var newValue;\n if (e.altKey) {\n newValue = this['findWordBoundary' + direction](this[prop]);\n }\n else if (e.metaKey || e.keyCode === 35 || e.keyCode === 36 ) {\n newValue = this['findLineBoundary' + direction](this[prop]);\n }\n else {\n this[prop] += direction === 'Left' ? -1 : 1;\n return true;\n }\n if (typeof newValue !== undefined && this[prop] !== newValue) {\n this[prop] = newValue;\n return true;\n }\n },\n\n /**\n * @private\n */\n _moveLeft: function(e, prop) {\n return this._move(e, prop, 'Left');\n },\n\n /**\n * @private\n */\n _moveRight: function(e, prop) {\n return this._move(e, prop, 'Right');\n },\n\n /**\n * Moves cursor left without keeping selection\n * @param {Event} e\n */\n moveCursorLeftWithoutShift: function(e) {\n var change = true;\n this._selectionDirection = 'left';\n\n // only move cursor when there is no selection,\n // otherwise we discard it, and leave cursor on same place\n if (this.selectionEnd === this.selectionStart && this.selectionStart !== 0) {\n change = this._moveLeft(e, 'selectionStart');\n\n }\n this.selectionEnd = this.selectionStart;\n return change;\n },\n\n /**\n * Moves cursor left while keeping selection\n * @param {Event} e\n */\n moveCursorLeftWithShift: function(e) {\n if (this._selectionDirection === 'right' && this.selectionStart !== this.selectionEnd) {\n return this._moveLeft(e, 'selectionEnd');\n }\n else if (this.selectionStart !== 0){\n this._selectionDirection = 'left';\n return this._moveLeft(e, 'selectionStart');\n }\n },\n\n /**\n * Moves cursor right\n * @param {Event} e Event object\n */\n moveCursorRight: function(e) {\n if (this.selectionStart >= this._text.length && this.selectionEnd >= this._text.length) {\n return;\n }\n this._moveCursorLeftOrRight('Right', e);\n },\n\n /**\n * Moves cursor right or Left, fires event\n * @param {String} direction 'Left', 'Right'\n * @param {Event} e Event object\n */\n _moveCursorLeftOrRight: function(direction, e) {\n var actionName = 'moveCursor' + direction + 'With';\n this._currentCursorOpacity = 1;\n\n if (e.shiftKey) {\n actionName += 'Shift';\n }\n else {\n actionName += 'outShift';\n }\n if (this[actionName](e)) {\n this.abortCursorAnimation();\n this.initDelayedCursor();\n this._fireSelectionChanged();\n this._updateTextarea();\n }\n },\n\n /**\n * Moves cursor right while keeping selection\n * @param {Event} e\n */\n moveCursorRightWithShift: function(e) {\n if (this._selectionDirection === 'left' && this.selectionStart !== this.selectionEnd) {\n return this._moveRight(e, 'selectionStart');\n }\n else if (this.selectionEnd !== this._text.length) {\n this._selectionDirection = 'right';\n return this._moveRight(e, 'selectionEnd');\n }\n },\n\n /**\n * Moves cursor right without keeping selection\n * @param {Event} e Event object\n */\n moveCursorRightWithoutShift: function(e) {\n var changed = true;\n this._selectionDirection = 'right';\n\n if (this.selectionStart === this.selectionEnd) {\n changed = this._moveRight(e, 'selectionStart');\n this.selectionEnd = this.selectionStart;\n }\n else {\n this.selectionStart = this.selectionEnd;\n }\n return changed;\n },\n\n /**\n * Removes characters from start/end\n * start/end ar per grapheme position in _text array.\n *\n * @param {Number} start\n * @param {Number} end default to start + 1\n */\n removeChars: function(start, end) {\n if (typeof end === 'undefined') {\n end = start + 1;\n }\n this.removeStyleFromTo(start, end);\n this._text.splice(start, end - start);\n this.text = this._text.join('');\n this.set('dirty', true);\n if (this._shouldClearDimensionCache()) {\n this.initDimensions();\n this.setCoords();\n }\n this._removeExtraneousStyles();\n },\n\n /**\n * insert characters at start position, before start position.\n * start equal 1 it means the text get inserted between actual grapheme 0 and 1\n * if style array is provided, it must be as the same length of text in graphemes\n * if end is provided and is bigger than start, old text is replaced.\n * start/end ar per grapheme position in _text array.\n *\n * @param {String} text text to insert\n * @param {Array} style array of style objects\n * @param {Number} start\n * @param {Number} end default to start + 1\n */\n insertChars: function(text, style, start, end) {\n if (typeof end === 'undefined') {\n end = start;\n }\n if (end > start) {\n this.removeStyleFromTo(start, end);\n }\n var graphemes = fabric.util.string.graphemeSplit(text);\n this.insertNewStyleBlock(graphemes, start, style);\n this._text = [].concat(this._text.slice(0, start), graphemes, this._text.slice(end));\n this.text = this._text.join('');\n this.set('dirty', true);\n if (this._shouldClearDimensionCache()) {\n this.initDimensions();\n this.setCoords();\n }\n this._removeExtraneousStyles();\n },\n\n});\n\n\n/* _TO_SVG_START_ */\n(function() {\n var toFixed = fabric.util.toFixed,\n multipleSpacesRegex = / +/g;\n\n fabric.util.object.extend(fabric.Text.prototype, /** @lends fabric.Text.prototype */ {\n\n /**\n * Returns SVG representation of an instance\n * @param {Function} [reviver] Method for further parsing of svg representation.\n * @return {String} svg representation of an instance\n */\n _toSVG: function() {\n var offsets = this._getSVGLeftTopOffsets(),\n textAndBg = this._getSVGTextAndBg(offsets.textTop, offsets.textLeft);\n return this._wrapSVGTextAndBg(textAndBg);\n },\n\n /**\n * Returns svg representation of an instance\n * @param {Function} [reviver] Method for further parsing of svg representation.\n * @return {String} svg representation of an instance\n */\n toSVG: function(reviver) {\n return this._createBaseSVGMarkup(\n this._toSVG(),\n { reviver: reviver, noStyle: true, withShadow: true }\n );\n },\n\n /**\n * @private\n */\n _getSVGLeftTopOffsets: function() {\n return {\n textLeft: -this.width / 2,\n textTop: -this.height / 2,\n lineTop: this.getHeightOfLine(0)\n };\n },\n\n /**\n * @private\n */\n _wrapSVGTextAndBg: function(textAndBg) {\n var noShadow = true,\n textDecoration = this.getSvgTextDecoration(this);\n return [\n textAndBg.textBgRects.join(''),\n '\\t\\t<text xml:space=\"preserve\" ',\n (this.fontFamily ? 'font-family=\"' + this.fontFamily.replace(/\"/g, '\\'') + '\" ' : ''),\n (this.fontSize ? 'font-size=\"' + this.fontSize + '\" ' : ''),\n (this.fontStyle ? 'font-style=\"' + this.fontStyle + '\" ' : ''),\n (this.fontWeight ? 'font-weight=\"' + this.fontWeight + '\" ' : ''),\n (textDecoration ? 'text-decoration=\"' + textDecoration + '\" ' : ''),\n 'style=\"', this.getSvgStyles(noShadow), '\"', this.addPaintOrder(), ' >',\n textAndBg.textSpans.join(''),\n '</text>\\n'\n ];\n },\n\n /**\n * @private\n * @param {Number} textTopOffset Text top offset\n * @param {Number} textLeftOffset Text left offset\n * @return {Object}\n */\n _getSVGTextAndBg: function(textTopOffset, textLeftOffset) {\n var textSpans = [],\n textBgRects = [],\n height = textTopOffset, lineOffset;\n // bounding-box background\n this._setSVGBg(textBgRects);\n\n // text and text-background\n for (var i = 0, len = this._textLines.length; i < len; i++) {\n lineOffset = this._getLineLeftOffset(i);\n if (this.textBackgroundColor || this.styleHas('textBackgroundColor', i)) {\n this._setSVGTextLineBg(textBgRects, i, textLeftOffset + lineOffset, height);\n }\n this._setSVGTextLineText(textSpans, i, textLeftOffset + lineOffset, height);\n height += this.getHeightOfLine(i);\n }\n\n return {\n textSpans: textSpans,\n textBgRects: textBgRects\n };\n },\n\n /**\n * @private\n */\n _createTextCharSpan: function(_char, styleDecl, left, top) {\n var shouldUseWhitespace = _char !== _char.trim() || _char.match(multipleSpacesRegex),\n styleProps = this.getSvgSpanStyles(styleDecl, shouldUseWhitespace),\n fillStyles = styleProps ? 'style=\"' + styleProps + '\"' : '',\n dy = styleDecl.deltaY, dySpan = '',\n NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS;\n if (dy) {\n dySpan = ' dy=\"' + toFixed(dy, NUM_FRACTION_DIGITS) + '\" ';\n }\n return [\n '<tspan x=\"', toFixed(left, NUM_FRACTION_DIGITS), '\" y=\"',\n toFixed(top, NUM_FRACTION_DIGITS), '\" ', dySpan,\n fillStyles, '>',\n fabric.util.string.escapeXml(_char),\n '</tspan>'\n ].join('');\n },\n\n _setSVGTextLineText: function(textSpans, lineIndex, textLeftOffset, textTopOffset) {\n // set proper line offset\n var lineHeight = this.getHeightOfLine(lineIndex),\n isJustify = this.textAlign.indexOf('justify') !== -1,\n actualStyle,\n nextStyle,\n charsToRender = '',\n charBox, style,\n boxWidth = 0,\n line = this._textLines[lineIndex],\n timeToRender;\n\n textTopOffset += lineHeight * (1 - this._fontSizeFraction) / this.lineHeight;\n for (var i = 0, len = line.length - 1; i <= len; i++) {\n timeToRender = i === len || this.charSpacing;\n charsToRender += line[i];\n charBox = this.__charBounds[lineIndex][i];\n if (boxWidth === 0) {\n textLeftOffset += charBox.kernedWidth - charBox.width;\n boxWidth += charBox.width;\n }\n else {\n boxWidth += charBox.kernedWidth;\n }\n if (isJustify && !timeToRender) {\n if (this._reSpaceAndTab.test(line[i])) {\n timeToRender = true;\n }\n }\n if (!timeToRender) {\n // if we have charSpacing, we render char by char\n actualStyle = actualStyle || this.getCompleteStyleDeclaration(lineIndex, i);\n nextStyle = this.getCompleteStyleDeclaration(lineIndex, i + 1);\n timeToRender = this._hasStyleChangedForSvg(actualStyle, nextStyle);\n }\n if (timeToRender) {\n style = this._getStyleDeclaration(lineIndex, i) || { };\n textSpans.push(this._createTextCharSpan(charsToRender, style, textLeftOffset, textTopOffset));\n charsToRender = '';\n actualStyle = nextStyle;\n textLeftOffset += boxWidth;\n boxWidth = 0;\n }\n }\n },\n\n _pushTextBgRect: function(textBgRects, color, left, top, width, height) {\n var NUM_FRACTION_DIGITS = fabric.Object.NUM_FRACTION_DIGITS;\n textBgRects.push(\n '\\t\\t<rect ',\n this._getFillAttributes(color),\n ' x=\"',\n toFixed(left, NUM_FRACTION_DIGITS),\n '\" y=\"',\n toFixed(top, NUM_FRACTION_DIGITS),\n '\" width=\"',\n toFixed(width, NUM_FRACTION_DIGITS),\n '\" height=\"',\n toFixed(height, NUM_FRACTION_DIGITS),\n '\"></rect>\\n');\n },\n\n _setSVGTextLineBg: function(textBgRects, i, leftOffset, textTopOffset) {\n var line = this._textLines[i],\n heightOfLine = this.getHeightOfLine(i) / this.lineHeight,\n boxWidth = 0,\n boxStart = 0,\n charBox, currentColor,\n lastColor = this.getValueOfPropertyAt(i, 0, 'textBackgroundColor');\n for (var j = 0, jlen = line.length; j < jlen; j++) {\n charBox = this.__charBounds[i][j];\n currentColor = this.getValueOfPropertyAt(i, j, 'textBackgroundColor');\n if (currentColor !== lastColor) {\n lastColor && this._pushTextBgRect(textBgRects, lastColor, leftOffset + boxStart,\n textTopOffset, boxWidth, heightOfLine);\n boxStart = charBox.left;\n boxWidth = charBox.width;\n lastColor = currentColor;\n }\n else {\n boxWidth += charBox.kernedWidth;\n }\n }\n currentColor && this._pushTextBgRect(textBgRects, currentColor, leftOffset + boxStart,\n textTopOffset, boxWidth, heightOfLine);\n },\n\n /**\n * Adobe Illustrator (at least CS5) is unable to render rgba()-based fill values\n * we work around it by \"moving\" alpha channel into opacity attribute and setting fill's alpha to 1\n *\n * @private\n * @param {*} value\n * @return {String}\n */\n _getFillAttributes: function(value) {\n var fillColor = (value && typeof value === 'string') ? new fabric.Color(value) : '';\n if (!fillColor || !fillColor.getSource() || fillColor.getAlpha() === 1) {\n return 'fill=\"' + value + '\"';\n }\n return 'opacity=\"' + fillColor.getAlpha() + '\" fill=\"' + fillColor.setAlpha(1).toRgb() + '\"';\n },\n\n /**\n * @private\n */\n _getSVGLineTopOffset: function(lineIndex) {\n var lineTopOffset = 0, lastHeight = 0;\n for (var j = 0; j < lineIndex; j++) {\n lineTopOffset += this.getHeightOfLine(j);\n }\n lastHeight = this.getHeightOfLine(j);\n return {\n lineTop: lineTopOffset,\n offset: (this._fontSizeMult - this._fontSizeFraction) * lastHeight / (this.lineHeight * this._fontSizeMult)\n };\n },\n\n /**\n * Returns styles-string for svg-export\n * @param {Boolean} skipShadow a boolean to skip shadow filter output\n * @return {String}\n */\n getSvgStyles: function(skipShadow) {\n var svgStyle = fabric.Object.prototype.getSvgStyles.call(this, skipShadow);\n return svgStyle + ' white-space: pre;';\n },\n });\n})();\n/* _TO_SVG_END_ */\n\n\n(function(global) {\n\n 'use strict';\n\n var fabric = global.fabric || (global.fabric = {});\n\n /**\n * Textbox class, based on IText, allows the user to resize the text rectangle\n * and wraps lines automatically. Textboxes have their Y scaling locked, the\n * user can only change width. Height is adjusted automatically based on the\n * wrapping of lines.\n * @class fabric.Textbox\n * @extends fabric.IText\n * @mixes fabric.Observable\n * @return {fabric.Textbox} thisArg\n * @see {@link fabric.Textbox#initialize} for constructor definition\n */\n fabric.Textbox = fabric.util.createClass(fabric.IText, fabric.Observable, {\n\n /**\n * Type of an object\n * @type String\n * @default\n */\n type: 'textbox',\n\n /**\n * Minimum width of textbox, in pixels.\n * @type Number\n * @default\n */\n minWidth: 20,\n\n /**\n * Minimum calculated width of a textbox, in pixels.\n * fixed to 2 so that an empty textbox cannot go to 0\n * and is still selectable without text.\n * @type Number\n * @default\n */\n dynamicMinWidth: 2,\n\n /**\n * Cached array of text wrapping.\n * @type Array\n */\n __cachedLines: null,\n\n /**\n * Override standard Object class values\n */\n lockScalingFlip: true,\n\n /**\n * Override standard Object class values\n * Textbox needs this on false\n */\n noScaleCache: false,\n\n /**\n * Properties which when set cause object to change dimensions\n * @type Object\n * @private\n */\n _dimensionAffectingProps: fabric.Text.prototype._dimensionAffectingProps.concat('width'),\n\n /**\n * Use this regular expression to split strings in breakable lines\n * @private\n */\n _wordJoiners: /[ \\t\\r]/,\n\n /**\n * Use this boolean property in order to split strings that have no white space concept.\n * this is a cheap way to help with chinese/japaense\n * @type Boolean\n * @since 2.6.0\n */\n splitByGrapheme: false,\n\n /**\n * Unlike superclass's version of this function, Textbox does not update\n * its width.\n * @private\n * @override\n */\n initDimensions: function() {\n if (this.__skipDimension) {\n return;\n }\n this.isEditing && this.initDelayedCursor();\n this.clearContextTop();\n this._clearCache();\n // clear dynamicMinWidth as it will be different after we re-wrap line\n this.dynamicMinWidth = 0;\n // wrap lines\n this._styleMap = this._generateStyleMap(this._splitText());\n // if after wrapping, the width is smaller than dynamicMinWidth, change the width and re-wrap\n if (this.dynamicMinWidth > this.width) {\n this._set('width', this.dynamicMinWidth);\n }\n if (this.textAlign.indexOf('justify') !== -1) {\n // once text is measured we need to make space fatter to make justified text.\n this.enlargeSpaces();\n }\n // clear cache and re-calculate height\n this.height = this.calcTextHeight();\n this.saveState({ propertySet: '_dimensionAffectingProps' });\n },\n\n /**\n * Generate an object that translates the style object so that it is\n * broken up by visual lines (new lines and automatic wrapping).\n * The original text styles object is broken up by actual lines (new lines only),\n * which is only sufficient for Text / IText\n * @private\n */\n _generateStyleMap: function(textInfo) {\n var realLineCount = 0,\n realLineCharCount = 0,\n charCount = 0,\n map = {};\n\n for (var i = 0; i < textInfo.graphemeLines.length; i++) {\n if (textInfo.graphemeText[charCount] === '\\n' && i > 0) {\n realLineCharCount = 0;\n charCount++;\n realLineCount++;\n }\n else if (!this.splitByGrapheme && this._reSpaceAndTab.test(textInfo.graphemeText[charCount]) && i > 0) {\n // this case deals with space's that are removed from end of lines when wrapping\n realLineCharCount++;\n charCount++;\n }\n\n map[i] = { line: realLineCount, offset: realLineCharCount };\n\n charCount += textInfo.graphemeLines[i].length;\n realLineCharCount += textInfo.graphemeLines[i].length;\n }\n\n return map;\n },\n\n /**\n * Returns true if object has a style property or has it on a specified line\n * @param {Number} lineIndex\n * @return {Boolean}\n */\n styleHas: function(property, lineIndex) {\n if (this._styleMap && !this.isWrapping) {\n var map = this._styleMap[lineIndex];\n if (map) {\n lineIndex = map.line;\n }\n }\n return fabric.Text.prototype.styleHas.call(this, property, lineIndex);\n },\n\n /**\n * Returns true if object has no styling or no styling in a line\n * @param {Number} lineIndex , lineIndex is on wrapped lines.\n * @return {Boolean}\n */\n isEmptyStyles: function(lineIndex) {\n if (!this.styles) {\n return true;\n }\n var offset = 0, nextLineIndex = lineIndex + 1, nextOffset, obj, shouldLimit = false,\n map = this._styleMap[lineIndex], mapNextLine = this._styleMap[lineIndex + 1];\n if (map) {\n lineIndex = map.line;\n offset = map.offset;\n }\n if (mapNextLine) {\n nextLineIndex = mapNextLine.line;\n shouldLimit = nextLineIndex === lineIndex;\n nextOffset = mapNextLine.offset;\n }\n obj = typeof lineIndex === 'undefined' ? this.styles : { line: this.styles[lineIndex] };\n for (var p1 in obj) {\n for (var p2 in obj[p1]) {\n if (p2 >= offset && (!shouldLimit || p2 < nextOffset)) {\n // eslint-disable-next-line no-unused-vars\n for (var p3 in obj[p1][p2]) {\n return false;\n }\n }\n }\n }\n return true;\n },\n\n /**\n * @param {Number} lineIndex\n * @param {Number} charIndex\n * @private\n */\n _getStyleDeclaration: function(lineIndex, charIndex) {\n if (this._styleMap && !this.isWrapping) {\n var map = this._styleMap[lineIndex];\n if (!map) {\n return null;\n }\n lineIndex = map.line;\n charIndex = map.offset + charIndex;\n }\n return this.callSuper('_getStyleDeclaration', lineIndex, charIndex);\n },\n\n /**\n * @param {Number} lineIndex\n * @param {Number} charIndex\n * @param {Object} style\n * @private\n */\n _setStyleDeclaration: function(lineIndex, charIndex, style) {\n var map = this._styleMap[lineIndex];\n lineIndex = map.line;\n charIndex = map.offset + charIndex;\n\n this.styles[lineIndex][charIndex] = style;\n },\n\n /**\n * @param {Number} lineIndex\n * @param {Number} charIndex\n * @private\n */\n _deleteStyleDeclaration: function(lineIndex, charIndex) {\n var map = this._styleMap[lineIndex];\n lineIndex = map.line;\n charIndex = map.offset + charIndex;\n delete this.styles[lineIndex][charIndex];\n },\n\n /**\n * probably broken need a fix\n * Returns the real style line that correspond to the wrapped lineIndex line\n * Used just to verify if the line does exist or not.\n * @param {Number} lineIndex\n * @returns {Boolean} if the line exists or not\n * @private\n */\n _getLineStyle: function(lineIndex) {\n var map = this._styleMap[lineIndex];\n return !!this.styles[map.line];\n },\n\n /**\n * Set the line style to an empty object so that is initialized\n * @param {Number} lineIndex\n * @param {Object} style\n * @private\n */\n _setLineStyle: function(lineIndex) {\n var map = this._styleMap[lineIndex];\n this.styles[map.line] = {};\n },\n\n /**\n * Wraps text using the 'width' property of Textbox. First this function\n * splits text on newlines, so we preserve newlines entered by the user.\n * Then it wraps each line using the width of the Textbox by calling\n * _wrapLine().\n * @param {Array} lines The string array of text that is split into lines\n * @param {Number} desiredWidth width you want to wrap to\n * @returns {Array} Array of lines\n */\n _wrapText: function(lines, desiredWidth) {\n var wrapped = [], i;\n this.isWrapping = true;\n for (i = 0; i < lines.length; i++) {\n wrapped = wrapped.concat(this._wrapLine(lines[i], i, desiredWidth));\n }\n this.isWrapping = false;\n return wrapped;\n },\n\n /**\n * Helper function to measure a string of text, given its lineIndex and charIndex offset\n * it gets called when charBounds are not available yet.\n * @param {CanvasRenderingContext2D} ctx\n * @param {String} text\n * @param {number} lineIndex\n * @param {number} charOffset\n * @returns {number}\n * @private\n */\n _measureWord: function(word, lineIndex, charOffset) {\n var width = 0, prevGrapheme, skipLeft = true;\n charOffset = charOffset || 0;\n for (var i = 0, len = word.length; i < len; i++) {\n var box = this._getGraphemeBox(word[i], lineIndex, i + charOffset, prevGrapheme, skipLeft);\n width += box.kernedWidth;\n prevGrapheme = word[i];\n }\n return width;\n },\n\n /**\n * Wraps a line of text using the width of the Textbox and a context.\n * @param {Array} line The grapheme array that represent the line\n * @param {Number} lineIndex\n * @param {Number} desiredWidth width you want to wrap the line to\n * @param {Number} reservedSpace space to remove from wrapping for custom functionalities\n * @returns {Array} Array of line(s) into which the given text is wrapped\n * to.\n */\n _wrapLine: function(_line, lineIndex, desiredWidth, reservedSpace) {\n var lineWidth = 0,\n splitByGrapheme = this.splitByGrapheme,\n graphemeLines = [],\n line = [],\n // spaces in different languges?\n words = splitByGrapheme ? fabric.util.string.graphemeSplit(_line) : _line.split(this._wordJoiners),\n word = '',\n offset = 0,\n infix = splitByGrapheme ? '' : ' ',\n wordWidth = 0,\n infixWidth = 0,\n largestWordWidth = 0,\n lineJustStarted = true,\n additionalSpace = this._getWidthOfCharSpacing(),\n reservedSpace = reservedSpace || 0;\n // fix a difference between split and graphemeSplit\n if (words.length === 0) {\n words.push([]);\n }\n desiredWidth -= reservedSpace;\n for (var i = 0; i < words.length; i++) {\n // if using splitByGrapheme words are already in graphemes.\n word = splitByGrapheme ? words[i] : fabric.util.string.graphemeSplit(words[i]);\n wordWidth = this._measureWord(word, lineIndex, offset);\n offset += word.length;\n\n lineWidth += infixWidth + wordWidth - additionalSpace;\n if (lineWidth >= desiredWidth && !lineJustStarted) {\n graphemeLines.push(line);\n line = [];\n lineWidth = wordWidth;\n lineJustStarted = true;\n }\n else {\n lineWidth += additionalSpace;\n }\n\n if (!lineJustStarted && !splitByGrapheme) {\n line.push(infix);\n }\n line = line.concat(word);\n\n infixWidth = splitByGrapheme ? 0 : this._measureWord([infix], lineIndex, offset);\n offset++;\n lineJustStarted = false;\n // keep track of largest word\n if (wordWidth > largestWordWidth) {\n largestWordWidth = wordWidth;\n }\n }\n\n i && graphemeLines.push(line);\n\n if (largestWordWidth + reservedSpace > this.dynamicMinWidth) {\n this.dynamicMinWidth = largestWordWidth - additionalSpace + reservedSpace;\n }\n return graphemeLines;\n },\n\n /**\n * Detect if the text line is ended with an hard break\n * text and itext do not have wrapping, return false\n * @param {Number} lineIndex text to split\n * @return {Boolean}\n */\n isEndOfWrapping: function(lineIndex) {\n if (!this._styleMap[lineIndex + 1]) {\n // is last line, return true;\n return true;\n }\n if (this._styleMap[lineIndex + 1].line !== this._styleMap[lineIndex].line) {\n // this is last line before a line break, return true;\n return true;\n }\n return false;\n },\n\n /**\n * Detect if a line has a linebreak and so we need to account for it when moving\n * and counting style.\n * @return Number\n */\n missingNewlineOffset: function(lineIndex) {\n if (this.splitByGrapheme) {\n return this.isEndOfWrapping(lineIndex) ? 1 : 0;\n }\n return 1;\n },\n\n /**\n * Gets lines of text to render in the Textbox. This function calculates\n * text wrapping on the fly every time it is called.\n * @param {String} text text to split\n * @returns {Array} Array of lines in the Textbox.\n * @override\n */\n _splitTextIntoLines: function(text) {\n var newText = fabric.Text.prototype._splitTextIntoLines.call(this, text),\n graphemeLines = this._wrapText(newText.lines, this.width),\n lines = new Array(graphemeLines.length);\n for (var i = 0; i < graphemeLines.length; i++) {\n lines[i] = graphemeLines[i].join('');\n }\n newText.lines = lines;\n newText.graphemeLines = graphemeLines;\n return newText;\n },\n\n getMinWidth: function() {\n return Math.max(this.minWidth, this.dynamicMinWidth);\n },\n\n _removeExtraneousStyles: function() {\n var linesToKeep = {};\n for (var prop in this._styleMap) {\n if (this._textLines[prop]) {\n linesToKeep[this._styleMap[prop].line] = 1;\n }\n }\n for (var prop in this.styles) {\n if (!linesToKeep[prop]) {\n delete this.styles[prop];\n }\n }\n },\n\n /**\n * Returns object representation of an instance\n * @method toObject\n * @param {Array} [propertiesToInclude] Any properties that you might want to additionally include in the output\n * @return {Object} object representation of an instance\n */\n toObject: function(propertiesToInclude) {\n return this.callSuper('toObject', ['minWidth', 'splitByGrapheme'].concat(propertiesToInclude));\n }\n });\n\n /**\n * Returns fabric.Textbox instance from an object representation\n * @static\n * @memberOf fabric.Textbox\n * @param {Object} object Object to create an instance from\n * @param {Function} [callback] Callback to invoke when an fabric.Textbox instance is created\n */\n fabric.Textbox.fromObject = function(object, callback) {\n return fabric.Object._fromObject('Textbox', object, callback, 'text');\n };\n})(typeof exports !== 'undefined' ? exports : this);\n\n\n(function() {\n\n var controlsUtils = fabric.controlsUtils,\n scaleSkewStyleHandler = controlsUtils.scaleSkewCursorStyleHandler,\n scaleStyleHandler = controlsUtils.scaleCursorStyleHandler,\n scalingEqually = controlsUtils.scalingEqually,\n scalingYOrSkewingX = controlsUtils.scalingYOrSkewingX,\n scalingXOrSkewingY = controlsUtils.scalingXOrSkewingY,\n scaleOrSkewActionName = controlsUtils.scaleOrSkewActionName,\n objectControls = fabric.Object.prototype.controls;\n\n objectControls.ml = new fabric.Control({\n x: -0.5,\n y: 0,\n cursorStyleHandler: scaleSkewStyleHandler,\n actionHandler: scalingXOrSkewingY,\n getActionName: scaleOrSkewActionName,\n });\n\n objectControls.mr = new fabric.Control({\n x: 0.5,\n y: 0,\n cursorStyleHandler: scaleSkewStyleHandler,\n actionHandler: scalingXOrSkewingY,\n getActionName: scaleOrSkewActionName,\n });\n\n objectControls.mb = new fabric.Control({\n x: 0,\n y: 0.5,\n cursorStyleHandler: scaleSkewStyleHandler,\n actionHandler: scalingYOrSkewingX,\n getActionName: scaleOrSkewActionName,\n });\n\n objectControls.mt = new fabric.Control({\n x: 0,\n y: -0.5,\n cursorStyleHandler: scaleSkewStyleHandler,\n actionHandler: scalingYOrSkewingX,\n getActionName: scaleOrSkewActionName,\n });\n\n objectControls.tl = new fabric.Control({\n x: -0.5,\n y: -0.5,\n cursorStyleHandler: scaleStyleHandler,\n actionHandler: scalingEqually\n });\n\n objectControls.tr = new fabric.Control({\n x: 0.5,\n y: -0.5,\n cursorStyleHandler: scaleStyleHandler,\n actionHandler: scalingEqually\n });\n\n objectControls.bl = new fabric.Control({\n x: -0.5,\n y: 0.5,\n cursorStyleHandler: scaleStyleHandler,\n actionHandler: scalingEqually\n });\n\n objectControls.br = new fabric.Control({\n x: 0.5,\n y: 0.5,\n cursorStyleHandler: scaleStyleHandler,\n actionHandler: scalingEqually\n });\n\n objectControls.mtr = new fabric.Control({\n x: 0,\n y: -0.5,\n actionHandler: controlsUtils.rotationWithSnapping,\n cursorStyleHandler: controlsUtils.rotationStyleHandler,\n offsetY: -40,\n withConnection: true,\n actionName: 'rotate',\n });\n\n if (fabric.Textbox) {\n // this is breaking the prototype inheritance, no time / ideas to fix it.\n // is important to document that if you want to have all objects to have a\n // specific custom control, you have to add it to Object prototype and to Textbox\n // prototype. The controls are shared as references. So changes to control `tr`\n // can still apply to all objects if needed.\n var textBoxControls = fabric.Textbox.prototype.controls = { };\n\n textBoxControls.mtr = objectControls.mtr;\n textBoxControls.tr = objectControls.tr;\n textBoxControls.br = objectControls.br;\n textBoxControls.tl = objectControls.tl;\n textBoxControls.bl = objectControls.bl;\n textBoxControls.mt = objectControls.mt;\n textBoxControls.mb = objectControls.mb;\n\n textBoxControls.mr = new fabric.Control({\n x: 0.5,\n y: 0,\n actionHandler: controlsUtils.changeWidth,\n cursorStyleHandler: scaleSkewStyleHandler,\n actionName: 'resizing',\n });\n\n textBoxControls.ml = new fabric.Control({\n x: -0.5,\n y: 0,\n actionHandler: controlsUtils.changeWidth,\n cursorStyleHandler: scaleSkewStyleHandler,\n actionName: 'resizing',\n });\n }\n})();\n\n"]},"metadata":{},"sourceType":"script"}