kkristof/gist:45862b9662ed9f8e9fbc

## gistfile1.txt
<!DOCTYPE html>
<html>
<body>

<canvas id="myCanvas" width="300" height="150" style="border:1px solid #d3d3d3;">
Your browser does not support the HTML5 canvas tag.</canvas>

<script>
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
ctx.fillStyle="red";
ctx.fillRect(10,10,50,50);
ctx.fillStyle="blue";
ctx.fillRect(20,20,50,50);

function copy()
{
var imgData=ctx.getImageData(10,10,50,100);
ctx.putImageData(imgData,10,70, 30, 5, 20, 100);
}
</script>

<button onclick="copy()">Copy</button>

</body>
</html>
	<!DOCTYPE html>
	<html>
	<body>

	<canvas id="myCanvas" width="300" height="150" style="border:1px solid #d3d3d3;">
	Your browser does not support the HTML5 canvas tag.</canvas>

	<script>
	var c=document.getElementById("myCanvas");
	var ctx=c.getContext("2d");
	ctx.fillStyle="red";
	ctx.fillRect(10,10,50,50);
	ctx.fillStyle="blue";
	ctx.fillRect(20,20,50,50);

	function copy()
	{
	var imgData=ctx.getImageData(10,10,50,100);
	ctx.putImageData(imgData,10,70, 30, 5, 20, 100);
	}
	</script>

	<button onclick="copy()">Copy</button>

	</body>
	</html>