// Fig. 10.21: Drag.java
// Using the MouseMotionAdapter class. 
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;

public class Drag extends Applet {
   private int xValue = -10, yValue = -10;

   public void init()
   {
      addMouseMotionListener( new MotionHandler( this ) );
   }

   public void paint( Graphics g )
   {
      g.drawString( "Drag the mouse to draw", 10, 20 );
      g.fillOval( xValue, yValue, 4, 4 );
   }

   // Override Component class update method to allow all ovals
   // to remain on the screen by not clearing the background.
   public void update( Graphics g ) { paint( g ); } 

   // set the drawing coordinates and repaint
   public void setCoordinates( int x, int y )
   {
      xValue = x;
      yValue = y;
      repaint();
   }
}

// Class to handle only mouse drag events for the Drag applet
class MotionHandler extends MouseMotionAdapter {
   private Drag dragger;

   public MotionHandler( Drag d ) { dragger = d; }

   public void mouseDragged( MouseEvent e )
      { dragger.setCoordinates( e.getX(), e.getY() ); }
}