ppuzzle.java

适合刚学习java的朋友们

import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public class PPuzzle extends Applet{
  Image imgPuzzle, buff;
  Point fifteen=new Point(3,3);
  int[][] map={{0,4,8,12},{1,5,9,13},{2,6,10,14},{3,7,11,15}};
  int sx, sy;
  Canvas screen;
  Graphics gs, gb;
  boolean running=false;
  Button bStart=new Button("货 霸烙");
  Button bSee=new Button("沥翠 弊覆 焊扁");
  public void init(){
    prepareImage();
    sx=imgPuzzle.getWidth(this)/4;
    sy=imgPuzzle.getHeight(this)/4;
    setBackground(Color.blue);
    initScreen();
    initButtons();
    add(screen);
    add(bStart);
    add(bSee);
  }
  void prepareImage(){
    imgPuzzle=getImage(getCodeBase(),"images/baby.gif");
    MediaTracker mt=new MediaTracker(this);
    mt.addImage(imgPuzzle,0);
    try{
      mt.waitForID(0);
    }catch(Exception e){}
    buff=createImage(imgPuzzle.getWidth(this),imgPuzzle.getHeight(this));
    gb=buff.getGraphics();
  }
  void initMap(){
    java.util.Random rnd=new java.util.Random(); 
    int temp, x1, y1, x2, y2;
    for(int i=0;i<100;i++){
      x1=rnd.nextInt(4);
      x2=rnd.nextInt(4);
      y1=rnd.nextInt(4);
      y2=rnd.nextInt(4);
      temp=map[x1][y1];
      map[x1][y1]=map[x2][y2];
      map[x2][y2]=temp;
    }
outer:for(int j=0;j<4;j++)
      for(int i=0;i<4;i++)
        if(map[i][j]==15){
          fifteen.setLocation(i,j);
          break outer;
        }  
  }
  void initScreen(){
    screen=new Canvas(){
       public void paint(Graphics g){
         if(gs==null)gs=getGraphics();
         if(running)
          drawScreen();
         else
          g.drawImage(imgPuzzle, 0, 0, this); 
       }
    };
    screen.setSize(imgPuzzle.getWidth(this),imgPuzzle.getHeight(this));
    screen.addMouseListener(new MouseAdapter(){
      public void mousePressed(MouseEvent me){
        if(!running)return;
        int x=me.getX()/sx, y=me.getY()/sy;
        int fx=(int)fifteen.getX(), fy=(int)fifteen.getY();
        if(Math.abs(fx-x)+Math.abs(fy-y)>=2)return;
        if(map[x][y]==15)return;
        map[fx][fy]=map[x][y];
        map[x][y]=15;
        fifteen.setLocation(x, y);
        drawScreen();
      } 
    });
  }
  void initButtons(){
    bStart.addActionListener(new ActionListener(){
      public void actionPerformed(ActionEvent ae){
        initMap();
        drawScreen();
        running=true;
        bSee.setLabel("沥翠 弊覆 焊扁");
      }
    });
    bSee.addActionListener(new ActionListener(){
      public void actionPerformed(ActionEvent ae){
        if(bSee.getLabel().equals("拌加 窍扁")){
          drawScreen();
          bSee.setLabel("沥翠 弊覆 焊扁");
        }  
        else{
          gs.drawImage(imgPuzzle, 0, 0, screen);
          bSee.setLabel("拌加 窍扁");
        }  
      }
    });
  }
  void drawScreen(){
    gb.clearRect(0, 0, sx*4, sy*4);
    for(int j=0;j<4;j++)
     for(int i=0;i<4;i++)
       if(map[i][j]!=15)drawSegment(map[i][j], i, j);
    gs.drawImage(buff, 0,0, screen);   
  }
  void drawSegment(int seg, int x, int y){
    int dx=seg%4*sx, dy=seg/4*sy;
    gb.drawImage(imgPuzzle, x*sx,y*sy,x*sx+sx-1,y*sy+sy-1, dx, dy, dx+sx-1, dy+sy-1, screen);
  }
}