paper.js/examples/Scripts/arcTo.html

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Example</title>
<script type="text/javascript" src="../../lib/Bootstrap.js"></script>
<script type="text/javascript" src="../../src/Paper.js"></script>
<script type="text/javascript" src="../../src/item/Item.js"></script>
<script type="text/javascript" src="../../src/basic/Point.js"></script>
<script type="text/javascript" src="../../src/basic/Rectangle.js"></script>
<script type="text/javascript" src="../../src/basic/Size.js"></script>
<script type="text/javascript" src="../../src/path/Segment.js"></script>
<script type="text/javascript" src="../../src/path/PathItem.js"></script>
<script type="text/javascript" src="../../src/path/Path.js"></script>
<script type="text/javascript" src="../../src/document/Doc.js"></script>
<script type="text/javascript" src="../../src/item/Layer.js"></script>
<script type="text/javascript" src="../../src/item/Group.js"></script>
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<script>
window.onload = function() {
var canvas = document.getElementById('canvas');
var doc = new Doc(canvas);
var point = new Point(1024, 768).divide(2);
for(var i = 0; i < 30; i++) {
var vector = new Point(10 + 20 * i, 0).rotate(i);
var l = vector.length;
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var path = new Path();
path.fillColor = i % 2 ? 'red' : 'black';
path.closed = true;
for(var j = 0; j < 17; j++) {
vector = vector.rotate(45 / 2);
if(j == 0) {
path.add(point.add(vector));
} else {
path.arcTo(point.add(vector), true);
}
}
doc.activeLayer.appendBottom(path);
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}
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doc.redraw();
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}
</script>
</head>
<body>
<canvas id='canvas' width=1024 height=768></canvas>
</body>