?下面是拼圖游戲的代碼.為了降低理解的程度,變量與方法的訪問控制都省掉了.
PPuzzle.java
import?java.awt.*;
import?java.awt.event.*;
import?java.applet.*;
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("新游戲");
Button?bSee=new?Button("顯示正確的圖像");
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.waitForAll();
???????}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);
???????????y1=rnd.nextInt(4);
???????????x2=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;
???????drawScreen();
???????}
???????
???});
???}
???void?initButtons(){
????bStart.addActionListener(new?ActionListener(){
??????public?void?actionPerformed(ActionEvent?ae){
????????initMap();
????????drawScreen();
????????running=true;
????????bSee.setLabel("顯示正確的圖像");
??????}
????});
????bSee.addActionListener(new?ActionListener(){
??????public?void?actionPerformed(ActionEvent?ae){
????????if(bSee.getLabel().equals("繼續游戲")){
??????????drawScreen();
??????????bSee.setLabel("顯示正確的圖像");
????????}??
????????else{
??????????gs.drawImage(imgpuzzle,?0,?0,?screen);
??????????bSee.setLabel("繼續游戲");
????????}??
??????}
????});
??}
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);
}
}下面是Html的代碼
<Htm>
<Body>
???<Center>
???<Applet?code="PPuzzle.class"?width=300?height=300?>
???</Applet>
???</Center>?
</Body>
</Htm>
方法prepareImage()中的imgpuzzle=getImage(getCodeBase(),"images/baby.gif");images/baby.gif可以改成你自己文件中的圖片.