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July 29, 2013 21:37
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A CodePen by Giovanny.
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| <!doctype html> | |
| <html lang="en"> | |
| <head> | |
| <meta charset="UTF-8" /> | |
| <title>Canvas Background</title> | |
| </head> | |
| <body> | |
| <header> | |
| <h1>Hello canvas background</h1> | |
| </header> | |
| <section> | |
| <header> | |
| <h2>It's amazing how this works</h2> | |
| </header> | |
| <article> | |
| <p>The original article is in <a href="http://updates.html5rocks.com/2012/12/Canvas-driven-background-images">HTML5 Rocks</a> | |
| </article> | |
| </section> | |
| <footer> | |
| </footer> | |
| </body> | |
| </html> |
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| var ctx = document.getCSSCanvasContext('2d', 'animation', 100, 100); | |
| ctx.fillStyle = 'rgb(49,149,137)'; | |
| ctx.fillRect(0,0,50,50); | |
| ctx.stroke(); | |
| colors= {red:62, green:27, blue:60}; | |
| window.requestAnimFrame = (function(){ | |
| return window.requestAnimationFrame || | |
| window.webkitRequestAnimationFrame || | |
| window.mozRequestAnimationFrame || | |
| function( callback ){ | |
| window.setTimeout(callback, 1000 / 60); | |
| }; | |
| })(); | |
| var redMulti = greenMulti = blueMulti = 1; | |
| (function loop(){ | |
| colors.red+=redMulti; | |
| colors.green+=greenMulti; | |
| colors.blue+=blueMulti; | |
| if(colors.red>105){ | |
| redMulti=-1; | |
| }else if(colors.red<62){ | |
| redMulti=1; | |
| } | |
| if(colors.green>244){ | |
| greenMulti=-1; | |
| }else if(colors.green<27){ | |
| greenMulti=1; | |
| } | |
| if(colors.blue>189){ | |
| blueMulti=-1; | |
| }else if(colors.blue<60){ | |
| blueMulti=1; | |
| } | |
| ctx.fillStyle = 'rgb('+colors.red+','+colors.green+','+colors.blue+')'; | |
| ctx.fillRect(0,0,50,50); | |
| ctx.fillRect(50,50,50,50); | |
| ctx.fillStyle = 'rgb('+(255-colors.red)+','+(255-colors.green)+','+(255-colors.blue)+')'; | |
| ctx.fillRect(50,0,50,50); | |
| ctx.fillRect(0,50,50,50); | |
| ctx.fill(); | |
| window.requestAnimFrame(loop); | |
| })(); |
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| body { | |
| background: -webkit-canvas(animation); | |
| font-size:200%; | |
| } | |
| header { | |
| margin: 0 auto; | |
| text-align: center; | |
| } |
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