Osculating circles.
Created
January 16, 2015 19:04
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Osculating circles
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<html> | |
<head> | |
<style> | |
body { | |
margin: 0; | |
padding: 0; | |
} | |
#sketchpadDiv { | |
position: absolute; | |
width: 100%; | |
height: 100%; | |
border: 1px solid #000; | |
-webkit-box-sizing: border-box; | |
-moz-box-sizing: border-box; | |
box-sizing: border-box; | |
} | |
#sketchpadCanvas { | |
position: absolute; | |
} | |
</style> | |
</head> | |
<body> | |
<div id="sketchpadDiv"> | |
<canvas id="sketchpadCanvas"></canvas> | |
</div> | |
</body> | |
<script type="text/javascript" src="https://code.jquery.com/jquery-2.1.1.min.js"></script> | |
<script type="text/javascript" src="http://www.garciadelcastillo.es/sketchpad/sketchpad-0.0.2.js"></script> | |
<script> | |
// OSCULLATING CIRCLES | |
// Define some sketch variables | |
var count = 30, // number of osculating circles | |
shrinkFactor = 0.95, // size ratio between them | |
intialSpeed = 750; // starting speed of main circle | |
// Initialize Sketchpad | |
var pad = new Sketchpad('sketchpadCanvas'); | |
// Define some styles | |
var blackFill = new pad.Style({ | |
stroke: 'rgba(0, 0, 0, 0)', // aka none | |
fill: '#000' | |
}), | |
whiteFill = new pad.Style({ | |
stroke: 'rgba(0, 0, 0, 0)', | |
fill: '#FFF' | |
}); | |
// Link radius to sketch dimensions | |
var r = pad.Measure.compose(pad.width, pad.height, function() { | |
return pad.width.value > pad.height.value ? 0.45 * pad.height.value : 0.45 * pad.width.value; | |
}); | |
// Initialize collections | |
var points = [], | |
circles = [], | |
circlesAux = []; | |
// Base elements | |
points.push(new pad.Node(0.5 * pad.width.value, 0.5 * pad.height.value)); | |
circles.push(pad.Circle.centerRadius(points[0], r)); | |
blackFill.applyTo(circles[0]); | |
// More elements | |
for (var i = 1; i < count; i++) { | |
// Create elements | |
var caux = pad.Circle.centerRadius(points[i - 1], (1 - shrinkFactor) * circles[i - 1].r) | |
p = pad.Point.along(caux, 0.0), | |
c = pad.Circle.centerRadius(p, shrinkFactor * circles[i - 1].r); | |
// Apply some styling | |
caux.setVisible(false); | |
if (i % 2 == 0) { | |
blackFill.applyTo(c); | |
} else { | |
whiteFill.applyTo(c); | |
} | |
// Add them to collection | |
circlesAux.push(caux); | |
points.push(p); | |
circles.push(c); | |
}; | |
// Now override pad.update to set some changes to happen at every frame | |
pad.update = function() { | |
for (var i = 1; i < count; i++) { | |
points[i].setParameter(pad.frameCount / (intialSpeed / i)); | |
} | |
}; | |
</script> | |
</html> |
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