clearing traces

clearing traces is important

by migerh

HTML

<script src="http://cdnjs.cloudflare.com/ajax/libs/jsxgraph/0.93/jsxgraphcore.js"></script>
<link rel="stylesheet" href="http://jsxgraph.uni-bayreuth.de/distrib/jsxgraph.css">
<div id="jxgbox" class="jxgbox" style="width:500px; height:500px;"></div>

JavaScript

board = JXG.JSXGraph.initBoard('jxgbox', {
      boundingbox:[-4, 6, 10, -4],
      axis: true,
      grid: false,
      keepaspectratio: true
  });

  p1 = board.createElement('point', [0, 0]);
  p2 = board.createElement('point', [6, -1]);
  c1 = board.createElement('circle', [p1, 2]);
  c2 = board.createElement('circle', [p2, 1.5]);
  g1 = board.createElement('glider', [6, 3, c1], {name:"D"});
  c3 = board.createElement('circle', [g1, 4]);
  g2 = board.createElement('intersection', [c2,c3,0], {name: "I"});
  m1 = board.createElement('midpoint', [g1,g2], {name:"T", trace: true});