java - Hitbox 不起作用

Question

在此代码中，碰撞盒没有感知到任何东西。这当圆形和矩形接触时，检查两个碰撞框是否相交的 if 语句不会执行其中的操作。我该如何让它发挥作用？

import java.awt.Graphics;
import java.awt.Rectangle;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Rectangle2D;
import java.util.Random;

import javax.swing.JFrame;

public class RunPaintGUI extends JFrame implements KeyListener {
    int run = 10;
    int x = 30;
    int y = 30;
    int score = 0;
    Random randomgenerator = new Random();
    int a = randomgenerator.nextInt(1220);
    int b = randomgenerator.nextInt(700);

    public static void main(String[] args) {

        RunPaintGUI RunPaintGUI = new RunPaintGUI();
    }

    public RunPaintGUI() {
        this.setSize(1275, 775);
        this.setResizable(false);
        this.setTitle("game");
        this.setVisible(true);
        this.addKeyListener(this);
    }

    public void paint(Graphics g) {
        super.paint(g);

        g.fill3DRect(x, y, 60, 60, true);

        g.fillOval(a, b, 50, 50);

        g.drawString("score: " + score, 600, 50);

    }

    Rectangle2D hitbox = new Rectangle(x, y, 60, 60);
    Ellipse2D.Double hitbox1 = new Ellipse2D.Double(a, b, 50, 50);

    public void checkiftouching() {
        if (hitbox1.intersects(hitbox))
            ;

        System.out.println("you won");
        a = randomgenerator.nextInt(1220);
        b = randomgenerator.nextInt(720);
        repaint();
        score = score + 1;
    }

    public void keyPressed(KeyEvent e) {
        if (e.getKeyCode() == KeyEvent.VK_LEFT) {
            x = x - run;
            hitbox.setFrame(x, getY(), getWidth(), getHeight());
            hitbox1.setFrame(a, b, 50, 50);
            repaint();

            // System.out.println(x);
        } else if (e.getKeyCode() == KeyEvent.VK_RIGHT) {
            x = x + run;
            hitbox.setFrame(x, getY(), getWidth(), getHeight());
            hitbox1.setFrame(a, b, 50, 50);
            repaint();

            // System.out.println(x);
        } else if (e.getKeyCode() == KeyEvent.VK_UP) {
            y = y - run;
            hitbox.setFrame(getX(), y, getWidth(), getHeight());
            hitbox1.setFrame(a, b, 50, 50);
            repaint();

            // System.out.println(y);
        } else if (e.getKeyCode() == KeyEvent.VK_DOWN) {
            y = y + run;
            hitbox.setFrame(getX(), y, getWidth(), getHeight());
            hitbox1.setFrame(a, b, 50, 50);
            repaint();

            // System.out.println(y);
        }
    }

    @Override
    public void keyTyped(KeyEvent e) {
        // TODO Auto-generated method stub

    }

    @Override
    public void keyReleased(KeyEvent e) {
        // TODO Auto-generated method stub

    }
}

Answer 1

你会注意到

public void checkiftouching(){

从未被调用过。此外，这个 if 语句末尾有一个分号，所以它的作用很少。

if (hitbox1.intersects(hitbox));

始终在 if、while、for、开关后面加上完整的括号 { .. }

如果您使用 IDE，它应该会为您突出显示这些错误。