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| import React, { Component } from 'react'; | |
| import logo from './logo.svg'; | |
| import './App.css'; | |
| class App extends Component { | |
| render() { | |
| return ( | |
| <div className="App"> | |
| <header className="App-header"> | |
| <img src={logo} className="App-logo" alt="logo" /> |
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| import React from 'react'; | |
| import ReactDOM from 'react-dom'; | |
| import './index.css'; | |
| import App from './App'; | |
| import registerServiceWorker from './registerServiceWorker'; | |
| ReactDOM.render(<App />, document.getElementById('root')); | |
| registerServiceWorker(); |
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"> | |
| <meta name="theme-color" content="#000000"> | |
| <!-- | |
| manifest.json provides metadata used when your web app is added to the | |
| homescreen on Android. See https://developers.google.com/web/fundamentals/engage-and-retain/web-app-manifest/ | |
| --> |
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <title>HTML5 Canvas</title> | |
| <link rel="stylesheet" href="style.css" /> | |
| </head> | |
| <body> | |
| <canvas id="canvas" width="800" height="800"></canvas> | |
| <script src="app.js"></script> |
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| const canvas = document.querySelector('#canvas'); | |
| const ctx = canvas.getContext('2d'); | |
| canvas.width = window.innerWidth; | |
| canvas.height = window.innerHeight; | |
| ctx.strokeStyle = '#BADA55'; | |
| ctx.lineWidth = 1; | |
| ctx.lineJoin = 'round'; | |
| ctx.lineCap = 'round'; |
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| let isDrawing = false; | |
| function draw (e) { | |
| if(!isDrawing) return ; | |
| console.log(e); | |
| } | |
| canvas.addEventListener('mousemove', draw); | |
| canvas.addEventListener('mousedown', () => isDrawing = true); | |
| }); |
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| let isDrawing = false; | |
| let lastX = 0; | |
| let lastY = 0; | |
| function draw (e) { | |
| if(!isDrawing) return ; | |
| console.log(e); | |
| ctx.beginPath(); | |
| ctx.moveTo(lastX, lastY); |
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| function draw (e) { | |
| if(!isDrawing) return ; | |
| console.log(e); | |
| ctx.beginPath(); | |
| ctx.moveTo(lastX, lastY); | |
| ctx.lineTo(e.offsetX, e.offsetY); | |
| ctx.stroke(); | |
| [lastX, lastY] = [e.offsetX, e.offsetY]; | |
| } |
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| let hue = 0; | |
| let direction = true; | |
| function draw (e) { | |
| if(!isDrawing) return ; | |
| console.log(e); | |
| ctx.strokeStyle = `hsl(${hue}, 100%, 50%)`; | |
| ctx.beginPath(); | |
| ctx.moveTo(lastX, lastY); | |
| ctx.lineTo(e.offsetX, e.offsetY); |
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