PaintPanel.java 文件源码

public PaintPanel()
{
   // handle frame mouse motion event
   addMouseMotionListener(

      new MouseMotionAdapter() // anonymous inner class
      {  
         // store drag coordinates and repaint
         public void mouseDragged( MouseEvent event )
         {
            if ( pointCount < points.length ) 
            {
               points[ pointCount ] = event.getPoint(); // find point
               pointCount++; // increment number of points in array
               repaint(); // repaint JFrame
            } // end if
         } // end method mouseDragged
      } // end anonymous inner class
   ); // end call to addMouseMotionListener
}