Merge branch 'feature/canvas' into feature/room

+import React, { useCallback, useEffect, useRef, useState } from 'react';
+import { Vector } from './types';
+
+// 참고 : https://basketdeveloper.tistory.com/79
+
+export const Canvas: React.FC = () => {
+  const canvasRef = useRef<HTMLCanvasElement>(null);
+  
+  const [mousePosition, setMousePosition] = useState<Vector>({ x:0, y:0 });
+  const [isPainting, setIsPainting] = useState(false);
+
+  const getCoordinates = useCallback((event: MouseEvent): Vector | undefined => {
+    if (!canvasRef.current) {
+      return;
+    } else {
+      return {
+        x: event.pageX - canvasRef.current.offsetLeft,
+        y: event.pageY - canvasRef.current.offsetTop
+      };
+    }
+  }, []);
+
+  const drawLine = useCallback((prev: Vector, current: Vector) => {
+    if (canvasRef.current) {
+      const context = canvasRef.current!.getContext('2d');
+      if (context) {
+        context.strokeStyle = 'black';
+        context.lineJoin = 'round';
+        context.lineWidth = 5;
+
+        context.beginPath();
+        context.moveTo(prev.x, prev.y);
+        context.lineTo(current.x, current.y);
+        context.closePath();
+
+        context.stroke();
+      }
+    }
+  }, []);
+
+  const startPaint = useCallback((event: MouseEvent) => {
+    const coordinates = getCoordinates(event);
+    if (coordinates) {
+      setIsPainting(true);
+      setMousePosition(coordinates);
+    }
+  }, []);
+
+  const paint = useCallback(
+    (event: MouseEvent) => {
+      // 드래그 방지
+      event.preventDefault();
+      event.stopPropagation();
+
+      if (isPainting) {
+        const newMousePosition = getCoordinates(event);
+        if (mousePosition && newMousePosition) {
+          drawLine(mousePosition, newMousePosition);
+          setMousePosition(newMousePosition);
+        }
+      }
+    },
+    [isPainting, mousePosition]
+  );
+
+  const exitPaint = useCallback(() => {
+    setIsPainting(false);
+  }, []);
+
+  useEffect(() => {
+    if (canvasRef.current) {
+      const canvas: HTMLCanvasElement = canvasRef.current;
+
+      canvas.addEventListener('mousedown', startPaint);
+      canvas.addEventListener('mousemove', paint);
+      canvas.addEventListener('mouseup', exitPaint);
+      canvas.addEventListener('mouseleave', exitPaint);
+  
+      return () => {
+        canvas.removeEventListener('mousedown', startPaint);
+        canvas.removeEventListener('mousemove', paint);
+        canvas.removeEventListener('mouseup', exitPaint);
+        canvas.removeEventListener('mouseleave', exitPaint);
+      };
+    }
+  }, [startPaint, paint, exitPaint]);
+
+  return (
+    <div className='mx-3 px-2 py-1 rounded shadow'>
+      <canvas ref={canvasRef} width='512' height='384' />
+    </div>
+  );
+}
\ No newline at end of file

@@ -24,3 +24,8 @@ export interface ChatData {
   sender: string;
   message: string;
 }
+
+export interface Vector {
+  x: number;
+  y: number;
+}

 import React, { useContext } from 'react';
 import { useLocation } from 'react-router';
 import { Main } from '../components/common/Main';
+import { Canvas } from '../components/room/Canvas';
 import { Chat } from '../components/room/Chat';
 import { RoomInfo } from '../components/room/RoomInfo';
 import SocketContext from '../contexts/SocketContext';
@@ -9,7 +10,8 @@ export const Room: React.FC = () => {
   return (
     <Main>
       <RoomInfo />
-      <div className='w-full'>
+      <div className='w-full flex'>
+          <Canvas />
           <Chat />
       </div>
     </Main>