多个键盘输入 Java

Question

我正在开发 space 入侵者类型的游戏，我有一个键盘控制器 class 但问题是如果我想移动我的播放器我可以同时射击，我怎么能更换我的控制器来解决这个问题？

按键

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

    for(int i = 0; i<handler.object.size(); i++) {
        gameObject tempObject = handler.object.get(i);

        if(tempObject.getId()==ObjectID.Player){
            if(key == KeyEvent.VK_D) tempObject.setVelX(5);
            if(key == KeyEvent.VK_A) tempObject.setVelX(-5);
            if(key == KeyEvent.VK_W) tempObject.setVelY(-10);
            if(key == KeyEvent.VK_S) tempObject.setVelY(10);
        }
        if(tempObject.getId()==ObjectID.Player && key == KeyEvent.VK_SPACE){
            CurrentTime = System.currentTimeMillis();

            if(NextShootTime<CurrentTime){
                handler.addObject(new Bullet(tempObject.getX()+40, tempObject.getY()-20,0, ObjectID.Bullet));
                handler.addObject(new Bullet(tempObject.getX()+30, tempObject.getY()-20,1, ObjectID.Bullet));
                handler.addObject(new Bullet(tempObject.getX()+50, tempObject.getY()-20,2, ObjectID.Bullet));
                NextShootTime = CurrentTime+ShootDelay;
            }
        }

        if(tempObject.getId()==ObjectID.Bullet){
            tempObject.setVelY(-5f);
            if(key == KeyEvent.VK_K) {
                handler.removeObject(tempObject);
            }
        }
    }

    if(key == KeyEvent.VK_ESCAPE ) {
        System.exit(0);
    }
}

密钥发布

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

    for(int i = 0; i<handler.object.size(); i++) {
        gameObject tempObject = handler.object.get(i);

        if(tempObject.getId()==ObjectID.Player){
            if(key == KeyEvent.VK_D) tempObject.setVelX(0);
            if(key == KeyEvent.VK_A) tempObject.setVelX(0);
            if(key ==KeyEvent.VK_W) tempObject.setVelY(0);
            if(key ==KeyEvent.VK_S) tempObject.setVelY(0);
        }
    }
}

Answer 1

不计算KeyEvent中的速度、加速度和方向。你应该在你的 GameLoop 中这样做。你可以在KeyEvent中记住击键，然后在GameLoop中处理它们。

您可以按如下方式查询KeyEvents。

private final BitSet keys = new BitSet();

addKeyListener(new KeyAdapter() {
    @Override
    public void keyPressed(KeyEvent e) {
        keys.set(e.getKeyCode());
    }

    @Override
    public void keyReleased(KeyEvent e) {
         keys.clear(e.getKeyCode());
    }
});

在您的 GameLoop 中，您可以使用 keys.get(keyCode) 查询是否按下了一个或多个键。

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