hitpigheadv3.java

用JAVA进行游戏设计的图书 可以了解JAVA的运行状态 和编写游戏的特点

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     show,hide;
   Image   SpriteImage,Frame; 
   Applet  Game;     
   Random  R;
   boolean showPig;  

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

      this.SpriteImage = SpriteImage;
      this.Frame       = Frame;
      this.Game        = Game;  
      showPig          = false; 
      
      show             = 50;
      hide             = 9900;
      
      setVisible(true);    
      setMove(true);   
   }

   public void updateState()
   {
      if(active == true)
      {

         if(Math.abs(R.nextInt() % 10000) < show)
         {
            if(showPig == false)
               showPig = true;
         }
         else if(Math.abs(R.nextInt() % 10000) > hide)
         {
            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 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;
   }

   public void setShow(int i)
   {
      show = i;
   }

   public void setHide(int i)
   {
      hide = i;
   }
}

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 HitPigHeadv3 extends Applet 
       implements Runnable,MouseListener,MouseMotionListener,ActionListener
{
   int          AppletWidth,AppletHeight,FrameWidth,FrameHeight,
                countX,countY,HammerWidth,HammerHeight,score,
                CurrentSecond,GameSecond,level;
   Image        frame,pig,hammer1,hammer2,OffScreen,PigHead1,
                PigHead2;
   Thread       newThread; 
   Graphics     drawOffScreen;
   MediaTracker MT;   

   PigSprite    pigSprite[];
   HammerSprite hammerSprite;

   Panel        Status,Control;
   Label        Time,Score;
   Button       start,end;
   boolean      StartGame,EndGame;
   StartScreen  S_Screen;
   CloseDialog  CD;

   GregorianCalendar time;   

   public void init()
   {
      addMouseListener(this);     
      addMouseMotionListener(this);   
      
      CD      = new CloseDialog(this,new Frame());

      level   = 1;
      Time    = new Label("时间: 0");
      Score   = new Label("得分: 0");
      end     = new Button("结束游戏");
      start   = new Button("开始游戏");
      end.addActionListener(this);
      start.addActionListener(this);
      end.setEnabled(false);

      Status  = new Panel();
      Control = new Panel();
      Status.setLayout(new GridLayout(1,2));
      Control.setLayout(new GridLayout(1,2));
      
      Status.add(Time);
      Status.add(Score);
      Control.add(start);
      Control.add(end);

      setLayout(new BorderLayout());
      add(Status,BorderLayout.NORTH);
      add(Control,BorderLayout.SOUTH);
      
      AppletWidth   = getSize().width;
      AppletHeight  = getSize().height;
      countX        = 3;        
      countY        = 3;        
      score         = 0;        
      GameSecond    = 0;
      CurrentSecond = -1;
      StartGame     = true;      
      EndGame       = false;
 
      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");
      PigHead1 = getImage(getDocumentBase(),"Images/pighead1.gif");
      PigHead2 = getImage(getDocumentBase(),"Images/pighead2.gif");
      MT.addImage(pig,0);
      MT.addImage(frame,0);
      MT.addImage(hammer1,0);
      MT.addImage(hammer2,0);
      MT.addImage(PigHead1,0);
      MT.addImage(PigHead2,0);

      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,i+100);


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

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

      S_Screen = new StartScreen(AppletWidth,AppletHeight,this,
                                 PigHead1,PigHead2);

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

      resize(FrameWidth*countX,FrameHeight*countY + 70);
   }

   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);

      if(StartGame)

         S_Screen.paintScreen(drawOffScreen); 
      else
      {  

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


         hammerSprite.paintSprite(drawOffScreen);
      }
           

      g.drawImage(OffScreen,0,35,this); 
   }

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

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

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

         if(StartGame)
            S_Screen.UpdateStatus();  
         else
         {

            time   = new GregorianCalendar();

            if(CurrentSecond != time.get(Calendar.SECOND))
            {
               CurrentSecond = time.get(Calendar.SECOND);
            
               GameSecond++;
               Time.setText("时间: " + GameSecond + "秒");


               if(GameSecond > 0 && GameSecond % 5 == 0 && level < 50)
               {
                  for(int i=0;i<9;i++)
                  {
                     pigSprite[i].setShow(50 + (level * 5));
                     pigSprite[i].setHide(9900 - (level * 50));
                  }

                  level++;
                  showStatus("level: " + level);
               }
            }

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

   public void endGame(boolean isEndGame)
   {
      EndGame = isEndGame;
   }

   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) - 35);
      showStatus("X:" + e.getX() + "," + "Y:" + e.getY());
   }
   
   public void mousePressed(MouseEvent e)  
   {
      if(StartGame) return;
      
      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;
            Score.setText("得分: " + score);
         }
      }
   }

   public void mouseReleased(MouseEvent e)  
   {
      if(StartGame) return;

      hammerSprite.updateState();     
   }

   public void mouseMoved(MouseEvent e) 
   {
      hammerSprite.setLocation(e.getX() - (HammerWidth / 2),
                               e.getY() - (HammerHeight / 2) - 35);
      showStatus("X:" + e.getX() + "," + "Y:" + e.getY());
   }  
 
   public void mouseDragged(MouseEvent e) 
   {

      hammerSprite.setLocation(e.getX() - (HammerWidth / 2),
                               e.getY() - (HammerHeight / 2) - 35);
   }

   public void actionPerformed(ActionEvent e)
   {
      if(e.getSource() == start)
      {
         StartGame = false;
 
         start.setEnabled(false);
         end.setEnabled(true);
      }
      
      if(e.getSource() == end)   
      {
         newThread = null;  
         CD.show();    

         if(EndGame)    
         {

            score         = 0;
            GameSecond    = 0;
            CurrentSecond = -1;
            StartGame     = true;
            EndGame       = false;
            start.setEnabled(true);
            end.setEnabled(false);

            Time.setText("时间: 0");
            Score.setText("得分: 0");
         }

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

class StartScreen    
{

   int     width,height,StringWidth,StringHeight,Ascent,Descent,X,Y;
   int     ImageLeftBound,ImageRightBound,ImageX,ImageY,ImageWidth,
           ImageHeight,VX;
   Font    F1,F2,F3;
   Image   Normal,Hit,currentImage;
   String  ChineseTitle,EnglishTitle,PressEnter;
   Applet  Game;
   boolean showPressEnter;

   FontMetrics FM;

 
   public StartScreen(int AppletWidth,int AppletHeight,Applet Game,
                      Image normal,Image hit)
   {

      F1     = new Font("TimesRoman",Font.BOLD,72);
      F2     = new Font("TimesRoman",Font.BOLD + Font.ITALIC,36);
      F3     = new Font("TimesRoman",Font.BOLD,20);

      ChineseTitle    = "棒打猪头";         
      EnglishTitle    = "Hit Pig's Head";    
      
      width           = AppletWidth;       
      height          = AppletHeight;      

      Normal          = normal; 
      Hit             = hit; 
 
      ImageWidth      = Normal.getWidth(Game);  
      ImageHeight     = Normal.getHeight(Game); 
      ImageLeftBound  = 25;                    
      ImageRightBound = AppletWidth - (25 + ImageWidth);  
      ImageX          = ImageRightBound;    
 
      VX              = -2;    
      this.Game       = Game;
      currentImage    = Normal; 
      showPressEnter  = true;    
   }

   public void UpdateStatus() 
   {
      ImageX = ImageX + VX;    

      if(ImageX <= ImageLeftBound) 
      {
         currentImage = Hit;    

         ImageX = ImageLeftBound;  
         VX     = -VX;      
      }

      if(ImageX >= ImageRightBound) 
      {
         currentImage = Normal;  

         ImageX = ImageRightBound; 
         VX     = -VX;       
      }
   }

   public void paintScreen(Graphics g) 
   {
      g.setFont(F1);  
      FM = g.getFontMetrics();

      Ascent       = FM.getAscent();
      Descent      = FM.getDescent();
      StringWidth  = FM.stringWidth(ChineseTitle);
      StringHeight = Ascent + Descent; 
      
      X            = (width - StringWidth) / 2;
      Y            = Ascent;

      g.setColor(Color.black);      
      g.drawString(ChineseTitle,X,Y); 

      Y            = StringHeight;
      g.drawLine(X,Y,X+StringWidth,Y);  

      X            = X + 30;
      Y            = Y + 5;
      g.drawLine(X,Y,X+StringWidth-60,Y);


      g.setFont(F2);                  
      FM = g.getFontMetrics();

      Ascent       = FM.getAscent();
      Descent      = FM.getDescent();
      StringWidth  = FM.stringWidth(EnglishTitle);
      StringHeight = Ascent + Descent; 

      X            = (width - StringWidth) / 2;
      Y            = Y + Ascent;
      g.drawString(EnglishTitle,X,Y);  

      ImageY       = Y + Descent + 30; 
      g.drawImage(currentImage,ImageX,ImageY,Game);
   }
}

class CloseDialog extends Dialog implements ActionListener
{
   Panel        P1,P2;
   Button       B1,B2;
   HitPigHeadv3 Game;

   public CloseDialog(HitPigHeadv3 Game,Frame owner)
   {
      super(owner,"离开游戏...",true);  

      this.Game = Game;
  
      setLayout(new GridLayout(2,1));   
      P1 = new Panel();                 
      P2 = new Panel();
      
      P1.add(new Label("真的要离开吗???"));
      P2.add(B1 = new Button("确定"));    
      P2.add(B2 = new Button("取消"));
      B1.addActionListener(this);        
      B2.addActionListener(this);

      add(P1);       
      add(P2);
      pack();      
   }

   public void actionPerformed(ActionEvent e)
   {
      if(e.getSource() == B1)    
         Game.endGame(true);
      else if(e.getSource() == B2) 
         Game.endGame(false);

      hide(); 
   }
}