How to clip a region

Description

clip() creates a new clipping region

Example

The following code clips a region.


<!DOCTYPE HTML>
<html>
<head>
<style>
canvas {<!--from   w w w  .  j  a v a2 s.c o m-->
      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>