PaintPanel.java 文件源码

public PaintPanel()
{
   // handle frame mouse motion event
   addMouseMotionListener(
      new MouseMotionAdapter() // anonymous inner class
      {  
         // store drag coordinates and repaint
         @Override
         public void mouseDragged(MouseEvent event)
         {
            points.add(event.getPoint());
            repaint(); // repaint JFrame
         } 
      } 
   ); 
}