Created
August 25, 2020 07:49
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Canvas HTML collisions
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| const canvas = document.getElementById('canvas'); | |
| let ctx = canvas.getContext('2d'); | |
| canvas.width = window.innerWidth; | |
| canvas.height = window.innerHeight; | |
| window.addEventListener('resize', () => { | |
| canvas.width = window.innerWidth; | |
| canvas.height = window.innerHeight; | |
| animate(); | |
| }) | |
| const distanceMiddleCircle = (x1, y1, x2, y2) => { | |
| //racine carré de (x2-x1)² + (y2-y1)² | |
| let xDist = x2-x1; | |
| let yDist = y2 - y1; | |
| return Math.sqrt(Math.pow(xDist, 2) + Math.pow(yDist, 2)); | |
| } | |
| class Circle { | |
| constructor(x, y, radius, color) { | |
| this.x = x; | |
| this.y = y; | |
| this.radius = radius; | |
| this.color = color; | |
| } | |
| draw () { | |
| ctx.beginPath(); | |
| ctx.arc(this.x, this.y, this.radius, 0, 2 * Math.PI); | |
| ctx.fillStyle = this.color; | |
| ctx.fill(); | |
| } | |
| } | |
| const circle1 = new Circle(300, 300, 100, 'black'); | |
| const circle2 = new Circle(undefined, undefined, 30, 'red'); | |
| const animate = () => { | |
| requestAnimationFrame(animate); | |
| ctx.clearRect(0, 0, canvas.width, canvas.height); | |
| circle1.draw(); | |
| canvas.addEventListener('mousemove', (e) => { | |
| circle2.x = e.clientX; | |
| circle2.y = e.clientY; | |
| }) | |
| circle2.draw(); | |
| if (distanceMiddleCircle(circle1.x, circle1.y, circle2.x, circle2.y) < circle1.radius + circle2.radius) { | |
| circle1.color = 'red'; | |
| } else { | |
| circle1.color = 'black'; | |
| } | |
| } | |
| animate(); |
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| <!DOCTYPE html> | |
| <html lang="fr"> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <meta name="viewport" content="width=device-width, initial-scale=1.0"> | |
| <title>Collisions canvas</title> | |
| <style> | |
| * { | |
| margin: 0; | |
| padding: 0; | |
| } | |
| html, body { | |
| width: 100%; | |
| height: 100%; | |
| } | |
| canvas { | |
| display: block; | |
| } | |
| </style> | |
| </head> | |
| <body> | |
| <canvas id="canvas"></canvas> | |
| <script src="app.js"></script> | |
| </body> | |
| </html> |
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