Quelltext der Konstruktion

  board = JXG.JSXGraph.initBoard('jxgbox', {boundingbox: [-15, 15, 15, -15], axis: true, grid: false,
                                 keepaspectratio: true, showcopyright: false});

  p1 = board.createElement('glider', [4, 0, board.defaultAxes.x], {name:"G"});
  c1 = board.createElement('circle', [p1, 7], {name:"k_1", withlabel: true});
  p2 = board.createElement('intersection', [board.defaultAxes.y, c1, 0]);
  p3 = board.createElement('midpoint', [p1, p2]);
  p4 = board.createElement('midpoint', [p1, p3], {name:"T"});

  loc = board.createElement('locus', [p4], {strokeColor: 'red', strokeWidth: '1px'});