#cvs
{
display: table-cell;
vertical-align: middle;
}
</style>
<script type="text/javascript">
function drawRound(context) {
if (context.counterclockwise) {
draw(context.x, context.y, context.r, context.start, context.start - Math.PI / 50, context.counterclockwise);
context.start -= Math.PI / 50;
return context.start > 0.5 * Math.PI;
}
else {
draw(context.x, context.y, context.r, context.start, context.start + Math.PI / 50, context.counterclockwise);
context.start += Math.PI / 50;
return context.start < Math.PI;
}
}
function draw(x, y, r, sAngle, eAngle, counterclockwise) {
var cvs = document.getElementById("cvs");
ctx = cvs.getContext("2d");
ctx.strokeStyle = "#f00";
ctx.beginPath();
ctx.arc(x, y, r, sAngle, eAngle, counterclockwise);
ctx.stroke();
}
$(function () {
$.timer(drawRound, { x: 100, y: 100, r: 50, start: 1.5 * Math.PI, counterclockwise: true }, 200);
$.timer(drawRound, { x: 100, y: 100, r: 60, start: 0, counterclockwise: false }, 200);
});
</script>
</head>
<body>
<div id="wrap">
<canvas id="cvs" height="400" width="500"></canvas>
</div>
</body>
</html>