SE450: Add New Node [50/63]

public void mousePressed(MouseEvent event)
{
   Point2D mousePoint = event.getPoint();
   Object tool = toolBar.getSelectedTool();
   ...
   if (tool instanceof Node)
   {
      Node prototype = (Node) tool;
      Node newNode = (Node)prototype.clone();
      graph.add(newNode, mousePoint);
   }
   ...
   repaint();
}