// 程序：棒打豬頭
// 范例文件：HitPigHeadv1.java

import java.awt.*;
import java.util.*;
import java.applet.*;
import java.awt.event.*;

abstract class SuperSprite    
{
   int     X,Y,width,height;
   boolean visible,active;

   abstract public void paintSprite(Graphics g);
   abstract public void updateState();

   public int getX()
   {
      return X;
   }

   public int getY()
   {
      return Y;
   }

   public void setLocation(int X,int Y)
   {
      this.X = X;
      this.Y = Y;
   }

   public int getWidth()
   {
      return width;
   }

   public int getHeight()
   {
      return height;
   }

   public void setSize(int width,int height)
   {
      this.width  = width;
      this.height = height;
   }

   public boolean canVisible()
   {
      return visible;
   }

   public void setVisible(boolean v)
   {
      visible = v;
   }

   public boolean canMove()
   {
      return active;
   }

   public void setMove(boolean m)
   {
      active = m;
   }
}

class PigSprite extends SuperSprite  
{
   int     seed;                    
   Image   SpriteImage,Frame;        
   Applet  Game;                   
   Random  R;
   boolean showPig;              

   public PigSprite(Image SpriteImage,Image Frame,Applet Game)
   {
      R = new Random();

      this.SpriteImage = SpriteImage;
      this.Frame       = Frame;
      this.Game        = Game;  
      showPig          = false; 
      
      setVisible(true);           
      setMove(true);            
   }

   public void updateState()
   {
      if(active == true)
      {
         if(R.nextInt(seed) % 100 < 1)
         {
            if(showPig == false)
               showPig = true;
         }
         else if(R.nextInt(seed) % 100 > 95)
         {
            if(showPig == true)
               showPig = false;
         }
      }
   }

   public void paintSprite(Graphics g)  
   {
      if(visible == true)     
      { 
         g.drawImage(Frame,X,Y,Game);  

         if(showPig == true)
            g.drawImage(SpriteImage,X + 12,Y + 18,Game);
      }
   }

   public void setSeed(int seed)
   {
      this.seed = seed;
   }

   public boolean hit(int X,int Y,int P_Width,int P_Height,int H_Width,
                      int H_Height)      
   {
      if((this.X + P_Width >= X) && (this.Y + (P_Height / 2) >= Y) && 
         (X + (H_Width / 2) >= this.X) && (Y + (H_Height / 2) >= this.Y) 
         && showPig)
      {
         showPig = false;
         return true;
      }
      else
         return false;
   }
}

class HammerSprite extends SuperSprite 
{
   Image  hammer1,hammer2,currentImage; 
   Applet Game; 
 
   public HammerSprite(Image hammer1,Image hammer2,Applet Game)
   {
      this.hammer1 = hammer1;
      this.hammer2 = hammer2;
      this.Game    = Game;

      currentImage = hammer1;

      setLocation(0,0);
      setVisible(false);     
      setMove(false);      
   }

   public void updateState()
   {
      if(currentImage == hammer1)
         currentImage = hammer2;
      else
         currentImage = hammer1;
   }

   public void paintSprite(Graphics g) 
   {
      if(visible == true)      
         g.drawImage(currentImage,X,Y,Game); 
   }
}

public class HitPigHeadv1 extends Applet 
             implements Runnable,MouseListener,MouseMotionListener
{
   int          AppletWidth,AppletHeight,FrameWidth,FrameHeight,
                countX,countY,HammerWidth,HammerHeight,score;
   Image        frame,pig,hammer1,hammer2,OffScreen;
   Thread       newThread; 
   Graphics     drawOffScreen;
   MediaTracker MT;   

   PigSprite    pigSprite[];
   HammerSprite hammerSprite;

   public void init()
   {
      addMouseListener(this);         
      addMouseMotionListener(this);   

      AppletWidth  = getSize().width;
      AppletHeight = getSize().height;

      countX       = 3;         
      countY       = 3;        
      score        = 0;        

      MT      = new MediaTracker(this);
      pig     = getImage(getDocumentBase(),"Images/pig.gif");
      frame   = getImage(getDocumentBase(),"Images/frame.gif");
      hammer1 = getImage(getDocumentBase(),"Images/hammer1.gif");
      hammer2 = getImage(getDocumentBase(),"Images/hammer2.gif");
      MT.addImage(pig,0);
      MT.addImage(frame,0);
      MT.addImage(hammer1,0);
      MT.addImage(hammer2,0);

      try
      {
         MT.waitForAll();
      }      
      catch(InterruptedException E){ }  

      FrameWidth  = frame.getWidth(this);   
      FrameHeight = frame.getHeight(this); 

      pigSprite   = new PigSprite[9];
      for(int i=0;i<9;i++)
      {

         pigSprite[i] = new PigSprite(pig,frame,this);


         pigSprite[i].setLocation(i%countX*FrameWidth,
                                  i/countY*FrameHeight);
 
         pigSprite[i].setSeed(i+100);  
      }         

      hammerSprite   = new HammerSprite(hammer1,hammer2,this);
      HammerWidth    = hammer1.getWidth(this);  
      HammerHeight   = hammer1.getHeight(this); 

      OffScreen      = createImage(AppletWidth,AppletHeight);
      drawOffScreen  = OffScreen.getGraphics();

      resize(FrameWidth*countX,FrameHeight*countY);
   }

   public void start()         
   {
      newThread = new Thread(this);  
      newThread.start();
   }

   public void stop()      
   {
      newThread = null;    
   }

   public void paint(Graphics g)
   {

      drawOffScreen.clearRect(0,0,AppletWidth,AppletHeight);


      for(int i=0;i<9;i++)
         pigSprite[i].paintSprite(drawOffScreen);


      hammerSprite.paintSprite(drawOffScreen);
           

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

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

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

         try
         {
            Thread.sleep(33);  
         }
         catch(InterruptedException E){ }

         for(int i=0;i<9;i++)     
            pigSprite[i].updateState();
      }
   }

   public void mouseExited(MouseEvent e)  
   {
      hammerSprite.setVisible(false);    
      hammerSprite.setLocation(0,0);     
   }
   
   public void mouseClicked(MouseEvent e){ }  
   
   public void mouseEntered(MouseEvent e)  
   {
      hammerSprite.setVisible(true);     

      hammerSprite.setLocation(e.getX() - (HammerWidth / 2),
                               e.getY() - (HammerHeight / 2));
   }
   
   public void mousePressed(MouseEvent e) 
   {
      hammerSprite.updateState();       

      int X = hammerSprite.getX();     
      int Y = hammerSprite.getY();   

      for(int i=0;i<9;i++)
      {

         if(pigSprite[i].hit(X,Y,FrameWidth,FrameHeight,HammerWidth,
                             HammerHeight) == true)
         {
            score = score + 10;
            showStatus("目前得分: " + score);
         }
      }
   }

   public void mouseReleased(MouseEvent e) 
   {
      hammerSprite.updateState();          
   }

   public void mouseMoved(MouseEvent e)  
   {

      hammerSprite.setLocation(e.getX() - (HammerWidth / 2),
                               e.getY() - (HammerHeight / 2));
   }  
 
   public void mouseDragged(MouseEvent e)   
   {

      hammerSprite.setLocation(e.getX() - (HammerWidth / 2),
                               e.getY() - (HammerHeight / 2));
   }
}