example18_6.java.bak

不错的教程 适合中高级人员的使用

import java.applet.*;import java.awt.*;import java.awt.event.*;
public class Example18_4 extends Applet implements MouseMotionListener
{  int x=-1,y=-1;
   public void init()
   {  setBackground(Color.green);
      addMouseMotionListener(this); 
   }
   public void paint(Graphics g)
   {  if(x!=-1&&y!=-1)
       {  g.setColor(Color.red);
          g.drawLine(x,y,x,y);
       }
   }
   public void mouseDragged(MouseEvent e)
   {  x=(int)e.getX();y=(int)e.getY();
      repaint();
    }
   public void mouseMoved(MouseEvent e){} 
   public void update(Graphics g)
   {  paint(g);
   } 
}