fancytitle.java

java applet小程序 运行可以产生火焰招牌

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

public class FancyTitle extends Applet implements Runnable
{
  private Image BackImage,ForeImage;
  private Image offI,virtualI;
  private Graphics offG,virtualG;
  private Thread thread = null;
  private MediaTracker imageTracker;
  
  private int height,width,X,Y;
  
  public void init()
  {
    BackImage = getImage(getDocumentBase(),"Back.jpg");
    ForeImage = getImage(getDocumentBase(),"Fore.gif");
    imageTracker = new MediaTracker(this);
    imageTracker.addImage(BackImage,0);
    imageTracker.addImage(ForeImage,0);
    
    width = this.size().width;
    height = this.size().height;
    
    try
    {
      imageTracker.waitForID(0);
    }
    catch(InterruptedException e){}
    
    offI = createImage(width,height);
    offG = offI.getGraphics();
    
    virtualI=createImage(width*2,height*2);
    virtualG=virtualI.getGraphics();
    
    
  }
  
  public void start()
  {
    if(thread == null)
    {
      thread = new Thread(this);
      thread.start();
    }
  }
  
  
  public void run()
  {
    int x= 0, y=0;
    
    int tileWidth   =   BackImage.getWidth(this);
    int tileHeight  =   BackImage.getHeight(this);
    while(thread != null)
    {
      try
      {
        thread.sleep(0);
		x=virtualI.getWidth(this)-width;
		y=virtualI.getHeight(this)-height;
        for(;(x>0)&&(y>0); x--,y--)
		{
              if((x==0)||(y==0))
              {
                x=virtualI.getWidth(this)-width;
                y=virtualI.getHeight(this)-height;
              }
              
              for(int j=0; j < virtualI.getHeight(this); j = j + tileHeight)
                for(int i=0; i < virtualI.getWidth(this); i = i + tileWidth)
                  virtualG.drawImage(BackImage, i, j, this);
              
              
              virtualG.drawImage(ForeImage, x, y,width,height,this);
              offG.drawImage(virtualI,-x,-y,this);
              repaint();
            }
      }
      catch(InterruptedException e){}
      
    }
  }
  
  public void update(Graphics g)
  {
    paint(g);
  }
  
  public void paint(Graphics g)
  {
    g.drawImage(offI,0,0,this);
  }


}