Created
November 3, 2011 14:41
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Bouncing Balls!
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| $ = jQuery | |
| requestAnimFrame = window.requestAnimationFrame or window.mozRequestAnimationFrame or window.webkitRequestAnimationFrame or window.msRequestAnimationFrame or window.oRequestAnimationFrame or (callback) -> window.setTimeout(callback, 1000 / 60) | |
| $.fn.axiom = (render) -> | |
| $element = $ this | |
| $canvas = $("<canvas width=\"#{$element.width()}\" height=\"#{$element.height()}\" />").appendTo(this) | |
| screen = $canvas[0].getContext '2d' | |
| $doublebuffer = $("<canvas width=\"#{$element.width()}\" height=\"#{$element.height()}\" />")[0] | |
| ctx = $doublebuffer.getContext '2d' | |
| update = -> | |
| requestAnimFrame update | |
| render ctx | |
| screen.clearRect 0, 0, $canvas.width(), $canvas.height() | |
| screen.drawImage $doublebuffer, 0, 0 | |
| requestAnimFrame update |
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| <!DOCTYPE html> | |
| <html lang="en"> | |
| <head> | |
| <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.6.4/jquery.min.js"></script> | |
| <script type="text/javascript" src="axiom.js"></script> | |
| <script type="text/javascript" src="test.js"></script> | |
| <style type="text/css"> | |
| #game{width:800px;height:600px;margin:auto;} | |
| </style> | |
| </head> | |
| <body> | |
| <div id="game"> | |
| </div> | |
| </body> | |
| </html> |
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| WIDTH = 800 | |
| HEIGHT = 600 | |
| rand = (m) -> (Math.random() * m) | |
| requestAnimFrame = window.requestAnimationFrame or window.mozRequestAnimationFrame or window.webkitRequestAnimationFrame or window.msRequestAnimationFrame or window.oRequestAnimationFrame or (callback) -> window.setTimeout(callback, 1000 / 60) | |
| $ -> | |
| balls = for i in [0..1000] | |
| ball = | |
| x: rand WIDTH | |
| y: rand HEIGHT | |
| vx: rand(3) - 1 | |
| vy: rand(3) - 1 | |
| $('#game').axiom (ctx) -> | |
| ctx.clearRect 0,0,WIDTH,HEIGHT | |
| ctx.fillStyle = '#f00' | |
| for ball in balls | |
| ball.x += ball.vx | |
| ball.y += ball.vy | |
| ball.vx = -ball.vx if ball.x > WIDTH or ball.x < 0 | |
| ball.vy = -ball.vy if ball.y > HEIGHT or ball.y < 0 | |
| ctx.beginPath() | |
| ctx.arc Math.round(ball.x), Math.round(ball.y), 5, 0, Math.PI*2, true | |
| ctx.closePath() | |
| ctx.fill() |
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