secondanimation.java

Java2游戏编程源码 第四章 很好的学习Java和简单游戏编程的书籍

// 程序：使用线程播放动画
// 范例文件：SecondAnimation.java

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

public class SecondAnimation extends Applet implements Runnable
{
   URL          ErrorHTML;       
   int          currentImage;   
   Image        Animation[];    
   MediaTracker MT;            

   Thread       newThread;      

   public void init()
   {
      currentImage = 0;           
      Animation    = new Image[8];   
      MT           = new MediaTracker(this);
  
      for(int i=0;i<8;i++)        
      {
         Animation[i] 
         = getImage(getDocumentBase(),"Images/Freedom" + (i+1) + ".gif");

         MT.addImage(Animation[i],0);
      }
 
      try 
      {
         showStatus("图像载入中...");  
         MT.waitForAll();             
      }
      catch(InterruptedException E)  
      { 
         try                         
         {
            ErrorHTML = new URL(getCodeBase().toString() + "ErrorHTML.html");
         }
         catch(MalformedURLException ME){ }

         getAppletContext().showDocument(ErrorHTML); 
      }
   }


   public void start()
   {

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

   public void stop()  
   {
      newThread = null; 
   }

    public void paint(Graphics g)  
   {

      g.drawImage(Animation[currentImage],50,10,250,250,this);
   }

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

         try
         {
            Thread.sleep(125);    
         }
         catch(InterruptedException E) 
         {
            try                
            {
                ErrorHTML = new URL(getCodeBase().toString() + "ErrorHTML.html");
            }
            catch(MalformedURLException ME){ }

            getAppletContext().showDocument(ErrorHTML); 
         }
      
         if(currentImage == 7)   
            currentImage = 0;      
         else
            currentImage = currentImage + 1; 
      }
   }
}