<html>
<head>
<title>A canvas globalCompositeOperation with shadow</title>
<script>
var compositeTypes = [
'source-over', 'source-in', 'source-out', 'source-atop',
'destination-over', 'destination-in'
];
function draw(){
for (i=0;i<compositeTypes.length;i++){
var label = document.createTextNode(compositeTypes[i]);
document.getElementById('lab'+i).appendChild(label);
var canvas = document.getElementById('tut'+i);
canvas.width = 80;
canvas.height = 80;
var ctx = canvas.getContext('2d');
// draw rectangle
ctx.fillStyle = "#09f";
ctx.fillRect(5,5,45,45);
// set composite property
ctx.globalCompositeOperation = compositeTypes[i];
// draw rectangle with shadow
ctx.fillStyle = "#f30";
ctx.shadowColor = 'blue';
ctx.shadowBlur = 10;
ctx.shadowOffsetX = 10;
ctx.shadowOffsetY = -10;
ctx.fillRect(20,25,45,45);
}
}
</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: 4px; }
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"></canvas><br/><label id="lab0"></label></td>
<td><canvas id="tut1"></canvas><br/><label id="lab1"></label></td>
<td><canvas id="tut2"></canvas><br/><label id="lab2"></label></td>
<td><canvas id="tut3"></canvas><br/><label id="lab3"></label></td>
<td><canvas id="tut4"></canvas><br/><label id="lab4"></label></td>
<td><canvas id="tut5"></canvas><br/><label id="lab5"></label></td>
</tr>
</table>
</div>
</body>
</html>
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