DateTimeAxis.js
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/**
* (c) 2010-2018 Torstein Honsi
*
* License: www.highcharts.com/license
*/
'use strict';
import H from './Globals.js';
import './Utilities.js';
var Axis = H.Axis,
getMagnitude = H.getMagnitude,
normalizeTickInterval = H.normalizeTickInterval,
timeUnits = H.timeUnits;
/**
* Set the tick positions to a time unit that makes sense, for example
* on the first of each month or on every Monday. Return an array
* with the time positions. Used in datetime axes as well as for grouping
* data on a datetime axis.
*
* @private
* @function Highcharts.Axis#getTimeTicks
*
* @param {*} normalizedInterval
* The interval in axis values (ms) and thecount
*
* @param {number} min
* The minimum in axis values
*
* @param {number} max
* The maximum in axis values
*
* @param {number} startOfWeek
*
* @return {number}
*/
Axis.prototype.getTimeTicks = function () {
return this.chart.time.getTimeTicks.apply(this.chart.time, arguments);
};
/**
* Get a normalized tick interval for dates. Returns a configuration object with
* unit range (interval), count and name. Used to prepare data for getTimeTicks.
* Previously this logic was part of getTimeTicks, but as getTimeTicks now runs
* of segments in stock charts, the normalizing logic was extracted in order to
* prevent it for running over again for each segment having the same interval.
* #662, #697.
*
* @private
* @function Highcharts.Axis#normalizeTimeTickInterval
*
* @param {number} tickInterval
*
* @param {Array<Array<number|string>>} [unitsOption]
*
* @return {*}
*/
Axis.prototype.normalizeTimeTickInterval = function (
tickInterval,
unitsOption
) {
var units = unitsOption || [[
'millisecond', // unit name
[1, 2, 5, 10, 20, 25, 50, 100, 200, 500] // allowed multiples
], [
'second',
[1, 2, 5, 10, 15, 30]
], [
'minute',
[1, 2, 5, 10, 15, 30]
], [
'hour',
[1, 2, 3, 4, 6, 8, 12]
], [
'day',
[1, 2]
], [
'week',
[1, 2]
], [
'month',
[1, 2, 3, 4, 6]
], [
'year',
null
]],
unit = units[units.length - 1], // default unit is years
interval = timeUnits[unit[0]],
multiples = unit[1],
count,
i;
// loop through the units to find the one that best fits the tickInterval
for (i = 0; i < units.length; i++) {
unit = units[i];
interval = timeUnits[unit[0]];
multiples = unit[1];
if (units[i + 1]) {
// lessThan is in the middle between the highest multiple and the
// next unit.
var lessThan = (interval * multiples[multiples.length - 1] +
timeUnits[units[i + 1][0]]) / 2;
// break and keep the current unit
if (tickInterval <= lessThan) {
break;
}
}
}
// prevent 2.5 years intervals, though 25, 250 etc. are allowed
if (interval === timeUnits.year && tickInterval < 5 * interval) {
multiples = [1, 2, 5];
}
// get the count
count = normalizeTickInterval(
tickInterval / interval,
multiples,
unit[0] === 'year' ?
Math.max(getMagnitude(tickInterval / interval), 1) : // #1913, #2360
1
);
return {
unitRange: interval,
count: count,
unitName: unit[0]
};
};