Lituus - JSXGraph Wiki (original) (raw)
From JSXGraph Wiki
A lituus is a spiral in which the angle is inversely proportional to the square of the radius (as expressed in polar coordinates).
[math]\displaystyle{ r^2\theta = k \, }[/math]
The JavaScript code to produce this picture
var b1 = JXG.JSXGraph.initBoard('box1', {axis:true,boundingbox: [-10, 10, 10, -10]}); var k = b1.create('slider', [[1,8],[5,8],[0,1,4]]); var c = b1.create('curve', [function(phi){return Math.sqrt(k.Value()/phi); }, [0, 0],0, 8*Math.PI], {curveType:'polar', strokewidth:1});