Created
January 12, 2014 14:53
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta name="description" content="Simple animation tests" /> | |
| <meta charset=utf-8 /> | |
| <title>Simple Animation Tests</title> | |
| </head> | |
| <body> | |
| <canvas id="canvas"></canvas> | |
| </body> | |
| </html> | |
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| var canvas = | |
| document.getElementById('canvas'), | |
| ctx = canvas.getContext('2d'), | |
| HEIGHT = window.innerHeight, | |
| WIDTH = window.innerWidth, | |
| TO_RADIANS = Math.PI / 360; | |
| var raf = (function(){ | |
| return window.requestAnimationFrame || | |
| window.webkitRequestAnimationFrame || | |
| window.mozRequestAnimationFrame || | |
| window.oRequestAnimationFrame || | |
| window.msRequestAnimationFrame || | |
| function(callback){ | |
| window.setTimeout(callback,1000/60); | |
| }; | |
| })(); | |
| function clear(style){ | |
| ctx.save(); | |
| ctx.fillStyle = style ||'black'|| 'rgba(0,0,0,0.01)'; | |
| ctx.fillRect(0,0,WIDTH,HEIGHT); | |
| ctx.restore(); | |
| } | |
| function square(x,y,w,h){ | |
| ctx.beginPath(); | |
| ctx.rect(WIDTH/2+x,HEIGHT/2+y,w,h); | |
| ctx.closePath(); | |
| ctx.fill(); | |
| } | |
| function circle(x,y,w,h){ | |
| ctx.beginPath(); | |
| ctx.arc(WIDTH/2+x,HEIGHT/2+y,w,0,Math.PI*2,true); | |
| ctx.closePath(); | |
| ctx.fill(); | |
| } | |
| canvas.width = WIDTH; | |
| canvas.height = HEIGHT; | |
| var offsetX = 0, | |
| offsetY = 0; | |
| function draw(){ | |
| clear(); | |
| offsetX += 1 ; | |
| offsetY++; | |
| var x = Math.cos(WIDTH + offsetX * TO_RADIANS)*WIDTH/7; | |
| var y = Math.cos(HEIGHT + offsetY * TO_RADIANS)*HEIGHT/2; | |
| ctx.fillStyle = 'orange'; | |
| circle(x,y,offsetX/200,offsetY); | |
| circle(y,x,offsetX/200,offsetY); | |
| circle(x,x,offsetX/200,offsetY); | |
| circle(y,y,offsetX/200,offsetY); | |
| //circle(x, y, 2, 10); | |
| // square(x,y,5,10); | |
| if(offsetX>1000){offsetX=0;} | |
| raf(draw,16); | |
| } | |
| clear('black'); | |
| draw(); | |
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