Question

我正在制作经典的＆＃34;在屏幕上移动图像＆＃34;程序。我试图让键绑定工作，而不是Keylistener，但到目前为止还没有成功。

我的对象位于链接列表中

//called when select an annotation
func mapView(mapView: MKMapView, didSelectAnnotationView view: MKAnnotationView) {
    let tapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(tapped))
    view.addGestureRecognizer(tapGestureRecognizer)
}
//Called when deselects the annotation
func mapView(mapView: MKMapView, didDeselectAnnotationView view: MKAnnotationView) {
    view.removeGestureRecognizer(view.gestureRecognizers!.first!)
}
func tapped(sender: UITapGestureRecognizer) {
    if let view = sender.view as? MKAnnotationView {
        performSegueWithIdentifier("info", sender: view)
        //do yours
    }
}

并通过

添加到此列表中

public LinkedList<GameObject> object = new LinkedList<GameObject>();

我的KeyBinding类如下

public void addObject(GameObject object){
    this.object.add(object);
}

}

我的Player类扩展了GameObject类，看起来（略微浓缩）为：

public class KeyBindings extends JPanel{

private static final String accelerate = "accelerate";

public KeyBindings(){
    System.out.println("test");
    registerKeyBinding(KeyStroke.getKeyStroke(KeyEvent.VK_UP, 0, false), "UP-press", new ShuttleMove(accelerate));
}

public void registerKeyBinding(KeyStroke keyStroke, String name, Action action) {
    InputMap im = getInputMap(WHEN_IN_FOCUSED_WINDOW);
    ActionMap am = getActionMap();

    im.put(keyStroke, name);
    am.put(name, action);
}

class ShuttleMove extends AbstractAction {

    public ShuttleMove(String movement) {

            if (movement.equals("accelerate")){
                //this.setVelocityForward(this.getVelocityForward() + 0.1);
                System.out.println("accelerate");
            }
    }
    public void actionPerformed(ActionEvent e) {
    }
}

我不知道如何激活＆＃34;虽然键绑定。它应该在主循环中吗？它应该在player.tick方法中被调用以更新播放器图像并随后绘制它吗？

另外，inputmap和actionmap如何与播放器对象相关联？我尝试过做这样的事情，但是没有用：

public class Player extends GameObject {

Handler handler;

public Player(int x, int y, ID id, int width, int height, int rotation,double totalRotation, Handler handler, double velocityForward, double velocityRotate){
    super(x, y, id, width, height, rotation, totalRotation);
    this.handler = handler;

}

public void tick(){ 
    x += this.getVelocityForward();
    y += this.getVelocityForward();
}
public void render(Graphics2D g2d){

    try {
        player = ImageIO.read(new File("src/Game/images/shuttle3.png"));
    } catch (IOException e) {
        e.printStackTrace();
    }

    AffineTransform old = g2d.getTransform();
    AffineTransform at = AffineTransform.getTranslateInstance(x,y);     

    g2d.drawImage(player, at,null);
    g2d.setTransform(old);
}
}

我认为我的播放器应该如何转换为JComponent，但我不确定如何完成（因为Eclipse告诉我它与我的GameObject类不兼容）。谁能引导我朝着正确的方向前进？如果我意外地遗漏了一些重要信息（我很确定我这样做了），请告诉我。

Answer 1

您无需“激活”键绑定，一旦填充ActionMap，它就已经激活。你做需要做的是实现Action对象的actionPerfomed方法。 Action对象本质上是一个动作处理程序。它一旦创建就不应该做任何事情，它只应该在实际执行动作后做一些事情。

在何处以及如何实例化输入映射和动作映射

1 个答案: