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Merge pull request #96 from nittre/feature_socketConnection
Feature socket connection
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,172 @@ | ||
| import React, { useRef, useEffect } from 'react'; | ||
| import io from 'socket.io-client'; | ||
| // import './styles/board.css'; | ||
|
|
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| const Board = () => { | ||
| const canvasRef = useRef(null); | ||
| const colorsRef = useRef(null); | ||
| const socketRef = useRef(); | ||
|
|
||
| useEffect(() => { | ||
| // --------------- getContext() method returns a drawing context on the canvas----- | ||
|
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| const canvas = canvasRef.current; | ||
| const test = colorsRef.current; | ||
| const context = canvas.getContext('2d'); | ||
|
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| // ----------------------- Colors -------------------------------------------------- | ||
|
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| const colors = document.getElementsByClassName('color'); | ||
| console.log(colors, 'the colors'); | ||
| console.log(test); | ||
| // set the current color | ||
| const current = { | ||
| color: 'black', | ||
| }; | ||
|
|
||
| // helper that will update the current color | ||
| const onColorUpdate = (e) => { | ||
| current.color = e.target.className.split(' ')[1]; | ||
| }; | ||
|
|
||
| // loop through the color elements and add the click event listeners | ||
| for (let i = 0; i < colors.length; i++) { | ||
| colors[i].addEventListener('click', onColorUpdate, false); | ||
| } | ||
| let drawing = false; | ||
|
|
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| // ------------------------------- create the drawing ---------------------------- | ||
|
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| const drawLine = (x0, y0, x1, y1, color, emit) => { | ||
| context.beginPath(); | ||
| context.moveTo(x0, y0); | ||
| context.lineTo(x1, y1); | ||
| context.strokeStyle = color; | ||
| context.lineWidth = 2; | ||
| context.stroke(); | ||
| context.closePath(); | ||
|
|
||
| if (!emit) { | ||
| return; | ||
| } | ||
| const w = canvas.width; | ||
| const h = canvas.height; | ||
|
|
||
| socketRef.current.emit('drawing', { | ||
| x0: x0 / w, | ||
| y0: y0 / h, | ||
| x1: x1 / w, | ||
| y1: y1 / h, | ||
| color, | ||
| }); | ||
| }; | ||
|
|
||
| // ---------------- mouse movement -------------------------------------- | ||
|
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| const onMouseDown = (e) => { | ||
| drawing = true; | ||
| current.x = e.clientX || e.touches[0].clientX; | ||
| current.y = e.clientY || e.touches[0].clientY; | ||
| }; | ||
|
|
||
| const onMouseMove = (e) => { | ||
| if (!drawing) { | ||
| return; | ||
| } | ||
| drawLine( | ||
| current.x, | ||
| current.y, | ||
| e.clientX || e.touches[0].clientX, | ||
| e.clientY || e.touches[0].clientY, | ||
| current.color, | ||
| true | ||
| ); | ||
| current.x = e.clientX || e.touches[0].clientX; | ||
| current.y = e.clientY || e.touches[0].clientY; | ||
| }; | ||
|
|
||
| const onMouseUp = (e) => { | ||
| if (!drawing) { | ||
| return; | ||
| } | ||
| drawing = false; | ||
| drawLine( | ||
| current.x, | ||
| current.y, | ||
| e.clientX || e.touches[0].clientX, | ||
| e.clientY || e.touches[0].clientY, | ||
| current.color, | ||
| true | ||
| ); | ||
| }; | ||
|
|
||
| // ----------- limit the number of events per second ----------------------- | ||
|
|
||
| const throttle = (callback, delay) => { | ||
| let previousCall = new Date().getTime(); | ||
| return function () { | ||
| const time = new Date().getTime(); | ||
|
|
||
| if (time - previousCall >= delay) { | ||
| previousCall = time; | ||
| callback.apply(null, arguments); | ||
| } | ||
| }; | ||
| }; | ||
|
|
||
| // -----------------add event listeners to our canvas ---------------------- | ||
|
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| canvas.addEventListener('mousedown', onMouseDown, false); | ||
| canvas.addEventListener('mouseup', onMouseUp, false); | ||
| canvas.addEventListener('mouseout', onMouseUp, false); | ||
| canvas.addEventListener('mousemove', throttle(onMouseMove, 10), false); | ||
|
|
||
| // Touch support for mobile devices | ||
| canvas.addEventListener('touchstart', onMouseDown, false); | ||
| canvas.addEventListener('touchend', onMouseUp, false); | ||
| canvas.addEventListener('touchcancel', onMouseUp, false); | ||
| canvas.addEventListener('touchmove', throttle(onMouseMove, 10), false); | ||
|
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| // -------------- make the canvas fill its parent component ----------------- | ||
|
|
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| const onResize = () => { | ||
| canvas.width = window.innerWidth; | ||
| canvas.height = window.innerHeight; | ||
| }; | ||
|
|
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| window.addEventListener('resize', onResize, false); | ||
| onResize(); | ||
|
|
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| // ----------------------- socket.io connection ---------------------------- | ||
| const onDrawingEvent = (data) => { | ||
| console.log('onDrawingEvent'); | ||
| const w = canvas.width; | ||
| const h = canvas.height; | ||
| drawLine(data.x0 * w, data.y0 * h, data.x1 * w, data.y1 * h, data.color); | ||
| }; | ||
|
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||
| socketRef.current = io.connect('http://localhost:4000', { | ||
| transports: ['websocket', 'polling'], | ||
| path: '/socket.io', | ||
| }); | ||
| socketRef.current.on('drawing', onDrawingEvent); | ||
| }, []); | ||
|
|
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| // ------------- The Canvas and color elements -------------------------- | ||
|
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||
| return ( | ||
| <div> | ||
| <canvas ref={canvasRef} className="WhiteBoard" /> | ||
|
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||
| <div ref={colorsRef} className="colors"> | ||
| <div className="color black" /> | ||
| <div className="color red" /> | ||
| <div className="color green" /> | ||
| <div className="color blue" /> | ||
| <div className="color yellow" /> | ||
| </div> | ||
| </div> | ||
| ); | ||
| }; | ||
|
|
||
| export default Board; |
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