简单的问题。我正在尝试重新创建Pong游戏。我已经在屏幕上得到了想要的图形,并且两个按键与KeyEvents一起移动了。我唯一的问题是,当我释放一个键时,另一个拨片也将停止(如果两个拨片都同时移动),我确切地知道为什么会发生这种情况,但无法找出解决方法。发生这种情况的原因是,当调用keyReleased方法时,两个桨都设置为速度0。如何在使用keyReleased方法分别移动/停止两个桨的地方进行不同的编码?

码:

package pong.main;

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

public class PongGame extends JPanel implements ActionListener,KeyListener {

private final int WIDTH = 750;
private final int HEIGHT = 750;
private int DELAY = 20;
private int IMAGE_SIZE = 35;

private ImageIcon paddle_one;
private ImageIcon paddle_two;
private ImageIcon pong_logo;
private ImageIcon pong_ball;
private Timer timer = new Timer(DELAY, this);

private int p1_x = 10;
private int p1_y = 325;

private int p2_x = 710;
private int p2_y = 325;

private int p1_moveX;
private int p1_moveY;

private int p2_moveX;
private int p2_moveY;

public PongGame(){

    timer.start();
    addKeyListener(this);
    setFocusable(true);
    setFocusTraversalKeysEnabled(false);

    paddle_one = new ImageIcon("C:\\Users\\Bryan\\Pictures\\paddle.gif");
    paddle_two = new ImageIcon("C:\\Users\\Bryan\\Pictures\\paddle.gif");
    pong_logo = new ImageIcon("C:\\Users\\Bryan\\Pictures\\pong_logo.gif");
    pong_ball = new ImageIcon("C:\\Users\\Bryan\\Pictures\\pong_ball.gif");

    setPreferredSize(new Dimension(WIDTH, HEIGHT));
    setBackground(Color.black);

}

public void paintComponent(Graphics g){

    super.paintComponent(g);

    paddle_one.paintIcon(this, g, p1_x, p1_y);
    paddle_two.paintIcon(this, g, p2_x, p2_y);
    pong_ball.paintIcon(this, g, 350, 350);
    pong_logo.paintIcon(this, g, 220, -100);

}

public void actionPerformed(ActionEvent e){

    repaint();

    p1_x += p1_moveX;
    p1_y += p1_moveY;

    p2_x += p2_moveX;
    p2_y += p2_moveY;
}

public void paddle_one_up(){
    p1_moveX = 0;
    p1_moveY = -5;
}

public void paddle_one_down(){
    p1_moveX = 0;
    p1_moveY = 5;
}

public void paddle_two_up(){
    p2_moveX = 0;
    p2_moveY = -5;
}

public void paddle_two_down(){
    p2_moveX = 0;
    p2_moveY = 5;
}

public void keyPressed(KeyEvent e){
    int code = e.getKeyCode();

    if(code == KeyEvent.VK_W){
        paddle_one_up();

    }
    if(code == KeyEvent.VK_S){
        paddle_one_down();

    }

    if(code == KeyEvent.VK_UP){
        paddle_two_up();

    }
    if(code == KeyEvent.VK_DOWN){
        paddle_two_down();

    }
}

public void keyReleased(KeyEvent e){

    int code = e.getKeyCode();

    if(code != KeyEvent.VK_W){
        p1_moveX = 0;
        p1_moveY = 0;
    }

    if(code != KeyEvent.VK_S){
        p1_moveX = 0;
        p1_moveY = 0;
    }

    if(code != KeyEvent.VK_UP){
        p2_moveX = 0;
        p2_moveY = 0;
    }
    if(code != KeyEvent.VK_DOWN){
        p2_moveX = 0;
        p2_moveY = 0;
    }
public void keyTyped(KeyEvent e){}

}

最佳答案

查看您的keyPressed方法和keyReleased方法之间的区别。
在keyReleased中执行类似的操作-检查KeyEvent对象的键代码并采取相应的措施。这两种方法之间的差异以及您无法解决此问题表明您的keyPressed代码是借来的代码。只要您先理解代码就可以借用代码。最好借用想法,然后编写自己的代码。
甚至更好-使用Key Bindings是比使用KeyListeners更安全,更好的解决方案。

10-08 07:15