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part16c_pixelation.html
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part16c_pixelation.html
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<!DOCTYPE html>
<html>
<title>Creative Coding Yea!</title>
<head>
<meta charset="utf-8">
<script language="javascript" src="js/creative_coding.js"></script>
<script language="javascript" src="js/canvas.js"></script>
<link rel="stylesheet" href="css/reset.css" type="text/css" media="screen" />
<link rel="stylesheet" href="css/style.css" type="text/css" media="screen" />
</head>
<body>
<script>
var ctx = createCanvas("canvas1");
// define the sample size
var sample_size = randomInt(20, 80);
//load an image
var img = new Image();
img.src = 'img/stevie-nicks2.jpg';
function draw(){
if(chance(200)) sample_size = randomInt(10, 40);
// loop through the rows from to to bottom of page
ctx.drawImage(img, 0, 0, w, h);
pixelate(sample_size)
}
function pixelate(sample_size, _ctx){
var context = _ctx || ctx;
var sample = context.getImageData(0,0,w,h).data;
for (var y= 0; y < h; y+= sample_size) {
for (var x = 0; x < w; x+= sample_size) {
var pos = (x + y * w) * 4;
var red = sample[pos];
var green = sample[pos + 1];
var blue = sample[pos + 2];
context.fillStyle = rgb(red, blue, green);
context.fillRect(x, y, sample_size, sample_size);
}
}
}
</script>
</body>
</html>