Scripted changes can be added to the sketch by overriding its update
function. This process would be analogous to Processing's draw()
function:
Last active
August 29, 2015 14:13
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Animation
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<!DOCTYPE html> | |
<meta charset="utf-8"> | |
<html> | |
<head> | |
<link rel="stylesheet" type="text/css" href="styles.css"> | |
</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.js"></script> | |
<script type="text/javascript" src="sketch.js"></script> | |
</html> |
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// Create new instance of Sketchpad in target Canvas | |
var pad = new Sketchpad('sketchpadCanvas'); | |
// Construct a circle with a rotating line inside | |
var center = new pad.Node(pad.width.value / 2, pad.height.value / 2), | |
circle = pad.Circle.centerRadius(center, 100); | |
tip = pad.Point.along(circle, 0.0), | |
hand = pad.Line.between(center, tip); | |
// Override sketch's update function with a custom updater | |
pad.update = function () { | |
// Make sure to use object's methods to modify values | |
// or changes won't replicate to children elements | |
tip.setParameter(pad.frameCount / 500); | |
// tip.parameter = pad.frameCount / 500; // this won't work | |
}; |
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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; | |
} |
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