File: colorful_tangents.html

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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="../src/loadjsxgraph.js"></script>
</head>
<body>
<h2>Colorful tangents</h2>
<div style="width:800px">
  <div id="jxgbox" class="jxgbox" style="width:600px; height:450px; float:left"></div>
</div>
<div id="debug" style="display:block;"></div>
   <script type="text/javascript">
    /* <![CDATA[ */
        JXG.Options.layer.curve = 8;

    
        var board, cons, p = [], t=[], f;
        board = JXG.JSXGraph.initBoard('jxgbox', {grid:true, originX: 300, originY: 400, unitX: 50, unitY: 50, axis:true});
        board.suspendUpdate();
        var j=0;
        f= board.create('functiongraph', [function(x){ return x*x;}, -4, 4], {strokeColor:'black', strokeWidth:'2pt'});
        for(i=-3; i<=3; i=i+0.25) {
            p.push(board.create('glider',[i,i*i,f],{strokeColor:'black', fillColor:JXG.hsv2rgb(j*360/25,1,1)}));
            t.push(board.create('tangent', [p[p.length-1]], { strokeColor:JXG.hsv2rgb(j*360/25,1,1) }));
            j++;
        }
        board.unsuspendUpdate();
  /* ]]> */
  </script>
</body>
</html>