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Clip a region in JavaScript

Description

The following code shows how to clip a region.

Example


<!--from  ww  w .  java  2s  .co m-->
<!DOCTYPE HTML>
<html>
<head>
<style>
canvas {
border: thin solid black
}

</style>
</head>
<body>
<canvas id="canvas" width="500" height="140">
Your browser doesn't support the <code>canvas</code> element
</canvas>
<script>
var ctx = document.getElementById("canvas").getContext("2d");
ctx.fillStyle = "yellow";
ctx.beginPath();
ctx.rect(20, 20, 500, 140);
ctx.fill();
ctx.beginPath();
ctx.rect(100, 20, 300, 100);
ctx.clip();
ctx.fillStyle = "red";
ctx.beginPath();
ctx.rect(0, 0, 500, 140);
ctx.fill();
</script>
</body>
</html>

Click to view the demo

The code above generates the following result.

Clip a region in JavaScript
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