Hyperbolic spiral

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Revision as of 18:08, 29 October 2009 by A WASSERMANN (talk | contribs)

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It can be described in polar coordinates [math](r, \theta)[/math] by the equation

[math]r = \frac{a}{\theta}\,[/math]

with a real number [math]a[/math].

The JavaScript code to produce this picture

<link rel="stylesheet" type="text/css" href="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraph.css" />
<script type="text/javascript" src="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraphcore.js"></script>
<div id="jsxgbox" class="jxgbox" style="width:500px; height:500px;"></div>
 board = JXG.JSXGraph.initBoard('jsxgbox', {originX: 250, originY: 250, unitX: 50, unitY: 50});
 var a = board.createElement('slider', [[0,5],[8,5],[0,4,30]],{name:'a'});
 var c = board.createElement('curve', [function(phi){return a.Value()/phi; }, [0, 0],0, 8*Math.PI],
             {curveType:'polar', strokewidth:4});