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<html>
<head>
<title>JSXGraph example</title>
<link rel="stylesheet" type="text/css" href="../distrib/jsxgraph.css" />
<script type="text/javascript" src="/javascript/prototype/prototype.js"></script>
<script type="text/javascript" src="../distrib/jsxgraphcore.js"></script>
</head>
<body>
<h2>Kegelschnitte in Polardarstellung</h2>
<div id="jxgbox" class="jxgbox" style="width:700px; height:500px;"></div>
<div id="debug" style="display:block;"></div>
<h3>Polar form of a conic section: r = p/(1-eps*cos(phi))</h3>
<h3 id="ausgabe"></h3>
<script type="text/javascript">
/* <![CDATA[ */
board = JXG.JSXGraph.initBoard('jxgbox', {originX: 250, originY: 250, unitX: 40, unitY: 40});
b1axisx = board.createElement('axis', [[0,0], [1,0]], {});
b1axisy = board.createElement('axis', [[0,0], [0,1]], {});
var p = board.createElement('point', [1,-2], {style:6,name:'p'});
var eps = board.createElement('point', [0,-3], {style:6,name:'eps'});
var len = board.createElement('point', [2,-4], {style:6,name:'length'});
var rho = board.createElement('slider', [[1,-5],[5,-5],[0,0,2*Math.PI]], {style:6,name:'rho'});
var f = board.createElement('curve',
[function(phi) { return p.X()/(1-eps.X()*Math.cos(phi+rho.Value())); }, [1,0], 0,function(){return len.X()*Math.PI}],
{curveType:'polar', strokewidth:2}
);
board.addHook(function(){$('ausgabe').innerHTML = p.X() + "/(1 - (" + eps.X() + ")*cos(φ))";});
var q = board.createElement('glider', [f], {style:6,name:'G'});
board.createElement('tangent', [q], {dash:3});
/* ]]> */
</script>
</body>
</html>
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