// 程序：二維連續圖像播放
// 范例文件：SerialImage2.java

import java.awt.*;
import java.applet.*;

public class SerialImage2 extends Applet implements Runnable
{
   int          SPF;       
   int sx, sy;           
   Image        Animation;  
   MediaTracker MT;      

   Thread       newThread; 

   Image    OffScreen;   
   Graphics drawOffScreen; 

 
   public void init()
   {
      SPF          = 100;             
      MT           = new MediaTracker(this);
  
      Animation
         = getImage(getDocumentBase(),"Images/Cg0430.jpg");

      MT.addImage(Animation,0);
 
      try 
      {
         showStatus("圖像載入中..."); 
         MT.waitForAll();            
      }
      catch(InterruptedException E){ }

      OffScreen     = createImage(250,250);   
      drawOffScreen = OffScreen.getGraphics(); 
   }
   //==================================================================

   public void start()  
   {

      newThread = new Thread(this);
      newThread.start();
   }

   public void stop()  
   {
      newThread = null; 
   }

   //==================================================================

   public void paint(Graphics g) 
   {

      drawOffScreen.setColor(Color.black);
      drawOffScreen.fillRect(0,0,250,250);


      drawOffScreen.drawImage(Animation,80,30,208,126,sx,sy,sx+128,sy+96,this);


      g.drawImage(OffScreen,0,0,250,250,this); 
   }

   public void update(Graphics g)
   {
      paint(g);
   }

   public void run()
   {
      while(newThread != null)
      {
         repaint();                  

         try
         {
            Thread.sleep(SPF);       

            sx += 128;
            if(sx == 640)
            {
               sy += 96;
               sx=0;
               if (sy == 480)
                  sy=0;
            }
         }
         catch(InterruptedException E){ }
      }
   }
}