java - MouseListener没有移动

Question

我一直在学习如何在 Java 中使用角色扮演游戏，并找到了一个很棒的教程。然而，本教程展示了如何使用关键监听器移动 Sprite ，我想做的是通过获取屏幕上的鼠标位置来移动 Sprite ，并在没有任何关键监听器的情况下自行移动 Sprite 。这是我到目前为止的代码，感谢您的帮助! (哦，问题是 Sprite 没有移动，忘了说……是因为 move 方法中的 while 循环吗？)

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.awt.Image;
import java.awt.event.*;

import javax.swing.ImageIcon;

public class SpaceCraft {

    private String craft = "craft.png";

    private int dx;
    private int dy;
    private int x;
    private int y;
    private Image image;

    public SpaceCraft() {
        ImageIcon spaceCraft = new ImageIcon(this.getClass().getResource(craft));
        image = spaceCraft.getImage();
        x = 40;
        y = 60;
    }

    public void move() {
        while ((x==Board.mouseX)==false) {
            if (x < Board.mouseX){
                x += 1;
            } else if (x > Board.mouseX){
                x -= 1;
            }
        }
        while ((y==Board.mouseY)==false) {
            if (y < Board.mouseY){
                y += 1;
            } else if (y > Board.mouseY){
                y -= 1;
            }
        }

    }

    public int getX() {
        return x;
    }

    public int getY() {
        return y;
    }

    public Image getImage() {
        return image;
    }



   /* public void keyPressed(KeyEvent e) {

        int key = e.getKeyCode();

        if (key == KeyEvent.VK_LEFT){
            dx = -1;
        }
        if (key == KeyEvent.VK_RIGHT) {
            dx = 1;
        }

        if (key == KeyEvent.VK_UP) {
            dy = -1;
        }

        if (key == KeyEvent.VK_DOWN) {
            dy = 1;
        }

    }*/

   /* public void keyReleased(KeyEvent e) {
        int key = e.getKeyCode();

        if (key == KeyEvent.VK_LEFT) {
            dx = 0;
        }

        if (key == KeyEvent.VK_RIGHT) {
            dx = 0;
        }

        if (key == KeyEvent.VK_UP) {
            dy = 0;
        }

        if (key == KeyEvent.VK_DOWN) {
            dy = 0;
        }
    }*/


}


import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Toolkit;
import java.awt.event.*;

import javax.swing.*;

import javax.swing.JPanel;
import javax.swing.Timer;
public class Board extends JPanel implements ActionListener {

    public static int mouseX;
    public static int mouseY;
    private Timer timer;
    private SpaceCraft craft;

    public Board() {
        //addKeyListener(new TAdapter());
        setFocusable(true);
        setBackground(Color.GREEN);
        setDoubleBuffered(true);

        craft = new SpaceCraft();

        timer = new Timer(5, this);
        timer.start();
    }

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

        Graphics2D g2d = (Graphics2D)g;
        g2d.drawImage(craft.getImage(), craft.getX(), craft.getY(), this);

        Toolkit.getDefaultToolkit().sync();
        g.dispose();
    }

    public void actionPerformed(ActionEvent e) {
        craft.move();
        repaint();
    }
    public void mouseReleased(MouseEvent e) {
        mouseX = e.getXOnScreen();
        mouseY = e.getYOnScreen();
        craft.move();
        repaint();
    }

    /*private class TAdapter extends KeyAdapter {

        public void keyReleased(KeyEvent e) {
            craft.keyReleased(e);
        }

        public void keyPressed(KeyEvent e) {
            craft.keyPressed(e);
        }
    }*/



}

import javax.swing.*;
import java.applet.*;
import java.awt.Dimension;
import java.net.*;

public class RType extends Applet {
    Board b = new Board();

    public void init() {
        b.setPreferredSize(new Dimension(400, 400));
        add(b);

    }

}

Answer 1

您必须将 MouseListener 添加到您的面板 Board。

改变

public class Board extends JPanel implements ActionListener {

至

public class Board extends JPanel implements ActionListener,MouseListener  {

在构造函数中添加

addMouseListener(this);