The tutorial window

All of the tutorials show some common code in the constructor that creates an instance of JGraph and places it into a frame. The code is:

  _jgraph = new JGraph();
  _graphPane = _jgraph.getGraphPane();

  TutorialWindow window = new TutorialWindow("Simple graph tutorial");
  window.getContentPane().add("Center",_jgraph);
  window.setSize(600,400);
  window.setVisible(true);

(Where _jgraph and _graphPane are private variables of the class.) Every JGraph contains a top-level canvas pane, which in turn contains layers. By default, the top-level pane is an instance of GraphPane.