canvas.html

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<body>

  <div id="container">
    <header>

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    <div id="main" role="main">
		<canvas id="canvas" width="300" height="300"></canvas>
    </div>
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  <script type="text/javascript" charset="utf-8">
	$(document).ready(function(){
		//get a reference to the canvas
		//BEGIN LIBRARY CODE
		var x = 150;
		var y = 150;
		var dx = 2;
		var dy = 4;
		var WIDTH;
		var HEIGHT;
		var ctx;

		init = function() {
		  ctx = $('#canvas')[0].getContext("2d");
		  WIDTH = $("#canvas").width();
		  HEIGHT = $("#canvas").height();
		  return setInterval(draw, 10);
		}

		circle = function(x,y,r) {
		  ctx.beginPath();
		  ctx.arc(x, y, r, 0, Math.PI*2, true);
		  ctx.closePath();
		  ctx.fill();
		}

		rect = function(x,y,w,h) {
		  ctx.beginPath();
		  ctx.rect(x,y,w,h);
		  ctx.closePath();
		  ctx.fill();
		}

		clear = function() {
		  ctx.clearRect(0, 0, WIDTH, HEIGHT);
		}

		//END LIBRARY CODE

		draw = function() {
		  clear();
		  circle(x, y, 10);

		  if (x + dx > WIDTH || x + dx < 0)
		    dx = -dx;
		  if (y + dy > HEIGHT || y + dy < 0)
		    dy = -dy;

		  x += dx;
		  y += dy;
		}

		init();
	});
	</script>
</body>
</html>