??????今天搞了個開車的可以玩,但是就是覺得有幾個地方不是很好.大家可以幫我優化一下.
CarRace.java
import?java.awt.*;
import?java.applet.*;
import?java.awt.event.*;
import?java.awt.image.*;
import?java.awt.geom.*;
import?java.util.*;
class?Car
{
??Image?img;
??int?x,?y;
??Dimension?dim;
??Car(Image?img){
????this.img=img;
??}??
??Car(Image?img,?int?x,?int?y){
????this.img=img;?this.x=x;?this.y=y;
??}
??Car(Image?img,?int?x,?int?y,?Dimension?dim){
????this(img,?x,?y);
????this.dim=dim;
??}
??void?draw(Graphics?g,?ImageObserver?observer){
????g.drawImage(img,?x,?y,?observer);??
??}
??int?getX(){?return?x;}
??int?getY(){?return?y;}
??void?setX(int?x){this.x=x;}
??void?setY(int?y){this.y=y;}
??void?setLocation(int?x,?int?y){
????this.x=x;?this.y=y;
??}
??
??int?getWidth(){?return?img.getWidth(null);}
??int?getHeight(){?return?img.getHeight(null);}
??Rectangle2D?getRectangle(){
????return?new?Rectangle2D.Float(x,?y,?getWidth(),?getHeight());
??}
??void?move(int?dx,?int?dy){
????x+=dx;
????y+=dy;
????if(dim!=null){
??????if(x<0)x=0;
??????if(x+getWidth()>dim.getWidth())?
????????x=(int)dim.getWidth()-getWidth();
????????if(y<0)x=0;
??????if(y+getWidth()>dim.getHeight())?
????????x=(int)dim.getWidth()-getHeight();
????}
????
??}
??boolean?intersects(Car?car){
????return?getRectangle().intersects(car.getRectangle());
??}
??boolean?intersects(int?x,?int?y){
????return?getRectangle().intersects(x,?y,?getWidth(),?getHeight());
??}
}
public?class?CarRace?extends?Applet?implements?KeyListener,?Runnable{
??Image?buff;
??Canvas?screen;
??Graphics2D?gs,?gb;
??Car?redCar;
??Car[]?enemy=new?Car[20];
??Button?bStart;
??Thread?game;
??boolean?loop=true;
??Dimension?dim=new?Dimension(200,?300);
??int?road;
??Random?rnd=new?Random();
??public?void?init(){
????prepareResource();
????setBackground(Color.blue);
????initScreen();
????add(screen);
????bStart=new?Button("開始游戲");
????add(bStart);
????bStart.addActionListener(new?ActionListener(){
??????public?void?actionPerformed(ActionEvent?ae){
????????screen.requestFocus();
????????if(!game.isAlive())
???????????game.start();
??????}
????});
??}
??void?prepareResource(){
????Image?imgRed=getImage(getCodeBase(),"images/red_car.gif");//這個是汽車的圖片(需要圖片的加我的QQ:251342771)
????Image?imgBlue=getImage(getCodeBase(),"images/blue_car.gif");//這個是汽車的圖片
????Image?imgGreen=getImage(getCodeBase(),"images/green_car.gif");//這個是汽車的圖片
????MediaTracker?mt=new?MediaTracker(this);
????try{
??????mt.addImage(imgRed,?0);
??????mt.addImage(imgBlue,?1);
??????mt.addImage(imgGreen,?2);
??????mt.waitForAll();
????}catch(Exception?e){}
????buff=createImage((int)dim.getWidth(),?(int)dim.getHeight());
????gb=(Graphics2D)buff.getGraphics();
????redCar=new?Car(imgRed,?80,250,?dim);
????
????for(int?i=0;i<10;i++){
???????enemy[i]=new?Car(imgBlue,?0,?0);
????}
????for(int?i=10;i<enemy.length;i++){
???????enemy[i]=new?Car(imgGreen,?0,?0);
????}
????for(int?i=0;i<enemy.length;i++){
???????setEnemy(i);
????}
????game=new?Thread(this);
??}
??public?void?stop(){
????loop=false;
??}
??public?void?run(){
????while(loop){
???????drawScreen();
???????try{?Thread.sleep(50);}catch(Exception?e){}
????}??
??}
??void?initScreen(){
????screen=new?Canvas(){
???????public?void?paint(Graphics?g){
?????????if(gs==null){
???????????gs=(Graphics2D)screen.getGraphics();
?????????}??
?????????drawScreen();
???????}
????};
????screen.setSize(dim);
????screen.addKeyListener(this);
??}
??void?setEnemy(int?en){
????int?x,?y;
next:while(true){
???????x=rnd.nextInt((int)dim.getWidth()-enemy[en].getWidth());
???????y=-rnd.nextInt(5000)-200;
??????outer:?for(int?j=0;j<enemy.length;j++){
?????????if(j!=en?&&?enemy[j].intersects(x,?y))continue?next;
???????}
???????enemy[en].setLocation(x,?y);
???????break;
????}
??}
??void?check(Car?en){
??????if(redCar.intersects(en)){
?????????if(redCar.getX()>en.getX()){
???????????en.move(-20,?0);
???????????redCar.move(20,?0);
???????????
?????????}??
?????????else{
???????????en.move(20,0);
???????????redCar.move(-20,?0);
??????????
?????????}??
??????}?
??}
??synchronized?void?drawScreen(){
????gb.clearRect(0,?0,?(int)dim.getWidth(),?(int)dim.getHeight());
????gb.setPaint(new?Color(100,?100,?100));
????gb.fillRect(0,?0,?(int)dim.getWidth(),?(int)dim.getHeight());
????drawRoad();
????for(int?i=0;i<enemy.length;i++){
???????enemy[i].move(0,?15);
???????enemy[i].draw(gb,?screen);
???????if(enemy[i].getY()>dim.getHeight())
?????????setEnemy(i);
???????check(enemy[i]);??
????}
????
????redCar.draw(gb,?screen);
????gs.drawImage(buff,?0,0,?screen);
????
??}
??void?drawRoad(){
????road+=80;
????gb.setPaint(Color.yellow);
????gb.fillRect((int)dim.getWidth()/2,?road,10,150);
????if(road>=dim.getHeight())road=-150;
??}
??public?void?keyPressed(KeyEvent?ke){
????if(ke.getKeyCode()==KeyEvent.VK_LEFT){
???????redCar.move(-10,0);
????}?
????else?if(ke.getKeyCode()==KeyEvent.VK_RIGHT){
???????redCar.move(10,0);
???????}??
????else?if(ke.getKeyCode()==KeyEvent.VK_UP){
???????redCar.move(0,-10);??
??}
??else?if(ke.getKeyCode()==KeyEvent.VK_DOWN){
???????redCar.move(0,10);
???????}
??}
??public?void?keyReleased(KeyEvent?ke){}
??public?void?keyTyped(KeyEvent?ke){}
}CarRace.html
<html>
<body>
?<center>
?<applet?code="CarRace.class"?width=250?height=350>
???</applet>
????</center>
</body>
</html>