EaselJS demo: hitTest

 <!DOCTYPE html>
<html>
<head>
	<title>EaselJS demo: hitTest</title>
	<link href="../shared/demo.css" rel="stylesheet" type="text/css">
	<script src="../../lib/easeljs-0.5.0.min.js"></script>
	<script>
		var stage, circle;
		function init() {
			stage = new createjs.Stage("demoCanvas");
			
			circle = stage.addChild(new createjs.Shape());
			circle.graphics.beginFill("red").drawCircle(50,50,50);
			circle.x = 0;
			circle.y = 0;
			
			createjs.Ticker.addListener(this);
		}
		
		function tick() {
			circle.alpha = 0.2;
			if (circle.hitTest(stage.mouseX, stage.mouseY)) { circle.alpha = 1; }
			stage.update();
		}
	</script>
</head>
<body onLoad="init();">
	<canvas id="demoCanvas" width="300" height="100">
		alternate content
	</canvas>
</body>
</html>