Created
March 19, 2012 18:47
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Create noise with canvas
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function generateNoise(opacity) { | |
if ( !!!document.createElement('canvas').getContext ) { | |
return false; | |
} | |
var canvas = document.createElement("canvas"), | |
ctx = canvas.getContext('2d'), | |
x, y, | |
number, | |
opacity = opacity || .2; | |
canvas.width = 100; | |
canvas.height = 100; | |
for ( x = 0; x < canvas.width; x++ ) { | |
for ( y = 0; y < canvas.height; y++ ) { | |
number = Math.floor( Math.random() * 60 ); | |
ctx.fillStyle = "rgba(" + number + "," + number + "," + number + "," + opacity + ")"; | |
ctx.fillRect(x, y, 1, 1); | |
} | |
} | |
document.body.style.backgroundImage = "url(" + canvas.toDataURL("image/png") + ")"; | |
} |
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