java - java中的砖 block 碰撞突破

Question

我一直在开发一款 Breakout 游戏，除了砖 block 碰撞之外，几乎所有的事情都完成了。球在墙壁、桨和砖 block 上弹跳。然而，当球从砖 block 上弹起时，砖 block 并没有消失。我真的很困惑。任何想法都将不胜感激。我所拥有的砖 block 、球和主类:

砖类:

import java.awt.*;
import java.applet.*;
public class Brick2{
    private int x;
    private int y;
    public Brick2(int X, int Y){
        x =X;
        y=Y;
    }
    public void update(Ball ba){
        collision(ba);
    }
    public void collision(Ball ba){
        int bX = ba.getX();
        int bY = ba.getY();
        int bHeight = ba.getImageHeight();
        int bWidth = ba.getImageWidth();
        for(int x=0; x <= 600; x+=55){
            for (int y=0; y<= 100; y+=25){
               if (bX-bWidth<=x && bX+bWidth>=x && bY-bHeight<=y && bY+bHeight>=y){
                   ba.setXVel(6);

                }
            }
        }
        }
        public int getX(){
        return x;
    }
    public int getY(){
        return y;
    }
    public void paint(Graphics g){
        for(int x=0; x <= 800; x+=55){
            for (int y=0; y<= 100; y+=25){
                g.setColor(Color.RED);
                g.fillRect(x,y,50,20);
            }
        }
   }
}

球类:

    import java.awt.*;
import java.applet.*;
public class Ball {
    private int x=355 ;
    private int y=200;
    private int speed = 6;
    private int xVel = -speed;
    private int yVel = speed;
    private boolean gameOver = false;
    private Image ball;
    public Ball (Breakout bR){
        ball = bR.getImage(bR.getDocumentBase(),"ball.png");
        }
    public void update(Breakout bR, Paddle p){
       x += xVel;
       y += yVel;
       if (x < 0){
           xVel = speed;
        }
       else if (x > bR.getWidth()){
            xVel = -speed;
        }
       if(y > bR.getHeight()){
           gameOver = true;
        }
       else if (y < 0){
            yVel = speed;
        }

       collision(p);
    }
    public void collision(Paddle p){
        int pX = p.getX();
        int pY = p.getY();
        int pHeight = p.getImageHeight();
        int pWidth = p.getImageWidth();

        if (pX<=x && pX+pWidth>=x && pY-pHeight<=y && pY+pHeight>=y){
           yVel = -speed;
        }
    }
    public int getX(){
        return x;
    }
    public int getY(){
        return y;
    }
    public int getImageWidth(){
        return ball.getWidth(null);
    }
    public int getImageHeight(){
        return ball.getHeight(null);
    }
    public void setXVel(int xv){
        yVel = xv;
    }
    public void paint (Graphics g, Breakout bR){
        g.drawImage(ball,x,y,bR);
        if (gameOver){
            g.setColor(Color.WHITE);
            g.drawString("Game Over", 100,300);
        }
    }
}

主类:

    import java.applet.*;
import java.awt.*;

public class Breakout extends Applet implements Runnable{
    Thread thread = new Thread(this);
    boolean running = true;
    //Brick b;
    Brick2 b2;
    Paddle p;
    Ball ba;
    Image dbImage;
    Graphics dbg;
   public void init(){
        setSize(800,600);
        //b = new Brick(this);
        b2 = new Brick2(0,0);
        p = new Paddle(this);
        ba = new Ball(this);

    }
    public void start(){
        thread.start();
    }
    public void destroy(){
        running = false;
    }
    public void stop(){
        running = false;
    }
    public void run(){
        while(running){
            //b.update(this,ba);

            b2.update(ba);
            p.update(this);
            ba.update(this,p);
            repaint();
            try{
                thread.sleep(20);
            }
            catch (InterruptedException e){
                System.out.println("AN ERROR HAS OCCURED");
            }
        }
    }
    public void update(Graphics g, Brick2 b){
        dbImage = createImage(getWidth(),getHeight());
        dbg = dbImage.getGraphics();
        paint(dbg);
        g.drawImage(dbImage,0,0,this);

                }
    public void paint(Graphics g){
        g.fillRect(0,0,800,600);
        //b.paint(g,this);
        b2.paint(g);
        p.paint(g,this);
        ba.paint(g,this);

    }   
}

感谢您的帮助。

Answer 1

您可以在 Brick 类 中添加一个 boolean isDestroyed = false。一旦Ball接触Brick(在您的collision()方法中)，设置isDestroyed = true并停止绘制/与该Brick交互:)不要忘记使该brick = null，以便稍后释放内存:)

执行此操作的最佳方法是将 boolean 值 isDestroyed 创建为私有(private)变量，并使用 isDestroyed 方法获取其值:

public class Brick2 {
    private boolean isDestroyed = false;

    public boolean isDestroyed() {
        return isDestroyed;
    }

    public void setIsDestroyed(boolean newValue) {
        isDestroyed = newValue;
    }
}

然后，在您的 Main 类中，在调用 b2.paint() 之前，检查 b2.isDestroyed 是否返回 true:

public class Breakout...{
    public void paint(...) {
        if(b2 != null && !b2.isDestroyed())
            b2.paint(g);
        else
            b2 = null;
}

但是，如果我是你，我会创建一个 Bricks 的 ArrayList 并通过 ArrayList 添加/删除它们。这样他们会更容易管理:)如果你还需要什么，你好。