paper.js/examples/Scripts/Chain.html

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<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>Example</title>
<link rel="stylesheet" href="../css/style.css">
<script type="text/javascript" src="../../dist/paper.js"></script>
<script type="text/paperscript" canvas="canvas">
// Adapted from the following Processing example:
// http://processing.org/learning/topics/follow3.html
var path = new Path();
path.style = {
strokeColor: '#E4141B',
strokeWidth: 20,
strokeCap: 'round'
};
var size = 25;
var segments = path.segments;
var start = view.center / [10, 1];
for (var i = 0; i < size; i++)
path.add(start + new Point(i * 100, 0));
function onMouseMove(event) {
segments[0].point = event.point;
for (var i = 0; i < size - 1; i++) {
var nextSegment = segments[i + 1];
var position = path.segments[i].point;
var angle = (position - nextSegment.point).angle;
var vector = new Point({ angle: angle, length: 35 });
nextSegment.point = position - vector;
}
path.smooth();
}
function onMouseDown(event) {
path.fullySelected = true;
path.strokeColor = '#e08285';
}
function onMouseUp(event) {
path.fullySelected = false;
path.strokeColor = '#e4141b';
}
</script>
</head>
<body>
<canvas id="canvas" resize keepalive="true"></canvas>
</body>
</html>