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Bouncing balls// source https://jsbin.com/xoqejok
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<!DOCTYPE html> | |
<html> | |
<head> | |
<meta charset="utf-8"> | |
<title>Bouncing balls</title> | |
<link rel="stylesheet" href="style.css"> | |
</head> | |
<body> | |
<h1>bouncing balls</h1> | |
<canvas></canvas> | |
<script src="main.js"></script> | |
</body> | |
</html> |
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// setup canvas | |
const canvas = document.querySelector('canvas'); | |
const ctx = canvas.getContext('2d'); | |
const width = canvas.width = window.innerWidth; | |
const height = canvas.height = window.innerHeight; | |
// function to generate random number | |
function random(min,max) { | |
const num = Math.floor(Math.random()*(max-min)) + min; | |
return num; | |
} | |
class Ball { | |
constructor(x, y, velX, velY, color, size) { | |
this.x = x; | |
this.y = y; | |
this.velX = velX; | |
this.velY = velY; | |
this.color = color; | |
this.size = size; | |
} | |
draw() { | |
ctx.beginPath(); | |
ctx.fillStyle = this.color; | |
ctx.arc(this.x, this.y, this.size, 0, 2 * Math.PI); | |
ctx.fill(); | |
} | |
update() { | |
if ((this.x + this.size) >= width) { | |
this.velX = -(this.velX); | |
} | |
if ((this.x - this.size) <= 0) { | |
this.velX = -(this.velX); | |
} | |
if ((this.y + this.size) >= height) { | |
this.velY = -(this.velY); | |
} | |
if ((this.y - this.size) <= 0) { | |
this.velY = -(this.velY); | |
} | |
this.x += this.velX; | |
this.y += this.velY; | |
} | |
collisionDetect() { | |
for (let j = 0; j < balls.length; j++) { | |
if (!(this === balls[j])) { | |
const dx = this.x - balls[j].x; | |
const dy = this.y - balls[j].y; | |
const distance = Math.sqrt(dx * dx + dy * dy); | |
if (distance < this.size + balls[j].size) { | |
balls[j].color = this.color = 'rgb(' + random(0, 255) + ',' + random(0, 255) + ',' + random(0, 255) +')'; | |
} | |
} | |
} | |
} | |
} | |
var balls = []; | |
while (balls.length < 25) { | |
const size = random(10,20); | |
let ball = new Ball( | |
// ball position always drawn at least one ball width | |
// away from the edge of the canvas, to avoid drawing errors | |
random(0 + size,width - size), | |
random(0 + size,height - size), | |
random(-5,5), | |
random(-5,5), | |
'rgb(' + random(0,255) + ',' + random(0,255) + ',' + random(0,255) +')', | |
size | |
); | |
balls.push(ball); | |
} | |
function loop() { | |
ctx.fillStyle = 'rgba(0, 0, 0, 0.5)'; | |
ctx.fillRect(0, 0, width, height); | |
for (let i = 0; i < balls.length; i++) { | |
balls[i].draw(); | |
balls[i].update(); | |
balls[i].collisionDetect(); | |
} | |
requestAnimationFrame(loop); | |
} | |
loop(); |
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html, body { | |
margin: 0; | |
} | |
html { | |
font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif; | |
height: 100%; | |
} | |
body { | |
overflow: hidden; | |
height: inherit; | |
} | |
h1 { | |
font-size: 2rem; | |
letter-spacing: -1px; | |
position: absolute; | |
margin: 0; | |
top: -4px; | |
right: 5px; | |
color: transparent; | |
text-shadow: 0 0 4px white; | |
} |
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