<html>
<head>
<title>A canvas globalCompositeOperation example</title>
<meta name="DC.creator" content="Kamiel Martinet, http://www.martinet.nl/">
<meta name="DC.publisher" content="Mozilla Developer Center, http://developer.mozilla.org">
<script type="application/x-javascript">
var compositeTypes = [
'source-over','source-in','source-out','source-atop',
'destination-over','destination-in','destination-out','destination-atop',
'lighter','copy','xor'
];
function draw(){
for (i=0;i<compositeTypes.length;i++){
var label = document.createTextNode(compositeTypes[i]);
document.getElementById('lab'+i).appendChild(label);
var ctx = document.getElementById('tut'+i).getContext('2d');
// draw rectangle
ctx.fillStyle = "#09f";
ctx.fillRect(15,15,70,70);
// set composite property
ctx.globalCompositeOperation = compositeTypes[i];
// draw circle
ctx.fillStyle = "#f30";
ctx.beginPath();
ctx.arc(75,75,35,0,Math.PI*2,true);
ctx.fill();
}
}
</script>
<style type="text/css">
body { margin: 20px; font-family: arial,verdana,helvetica; background: #fff;}
h1 { font-size: 140%; font-weight:normal; color: #036; border-bottom: 1px solid #ccc; }
canvas { border: 2px solid #000; margin-bottom: 5px; }
td { padding: 7px; }
pre { float:left; display:block; background: rgb(238,238,238); border: 1px dashed #666; padding: 15px 20px; margin: 0 0 10px 0; }
</style>
</head>
<body onload="draw();">
<div>
<table>
<tr>
<td><canvas id="tut0" width="125" height="125"></canvas><br/><label id="lab0"></label></td>
<td><canvas id="tut1" width="125" height="125"></canvas><br/><label id="lab1"></label></td>
<td><canvas id="tut2" width="125" height="125"></canvas><br/><label id="lab2"></label></td>
<td><canvas id="tut3" width="125" height="125"></canvas><br/><label id="lab3"></label></td>
</tr>
<tr>
<td><canvas id="tut4" width="125" height="125"></canvas><br/><label id="lab4"></label></td>
<td><canvas id="tut5" width="125" height="125"></canvas><br/><label id="lab5"></label></td>
<td><canvas id="tut6" width="125" height="125"></canvas><br/><label id="lab6"></label></td>
<td><canvas id="tut7" width="125" height="125"></canvas><br/><label id="lab7"></label></td>
</tr>
<tr>
<td><canvas id="tut8" width="125" height="125"></canvas><br/><label id="lab8"></label></td>
<td><canvas id="tut9" width="125" height="125"></canvas><br/><label id="lab9"></label></td>
<td><canvas id="tut10" width="125" height="125"></canvas><br/><label id="lab10"></label></td>
</tr>
</table>
</div>
</body>
</html>
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