LibGDX - 向上滑动或向右滑动等?

2022-01-12 00:00:00 swipe android java libgdx touch

触摸区域http://imageshack.us/a/img836/2909/swipe1.png

在绿色区域，用户可以向上、向右、向下、向左滑动.我现在怎么能得到例如向上滑动?或向下滑动?或向右滑动或向左滑动?例如如何获取字符串 -> input = getSwiped();-> 输入然后向上，或向右，或向下，或向左

In the green area the user can swipe up, right, down, left. How can I now get e.g. swipe Up? or swipe Down? or swipe right or swipe left? e.g. how to get a String -> input = getSwiped(); -> input is then Up, or right, or down, or left

并且用户可以触摸两个按钮.1 或 2.1 是鸭子，2 是跳跃.

And the user can touch two buttons. 1 or 2. 1 is for duck and 2 is for jump.

我想同时检查这些输入.用户可以同时触摸和向上滑动.

I want to check this inputs at the same time. The user can touch and also swipe Up at the same moment.

我知道有一个 GestureDetector.我查看了代码，但不知道如何使用滑动部分.

I know there is a GestureDetector. I looked at the code, but no clue how can I use the swipe part.

我知道一点如何检查按钮.问题只在这里 -> 如何同时检查输入以及如何向上滑动或向右滑动等.

I know a little bit how to check the buttons. The problem is only here -> How to check the inputs at the same time and how get Swipe Up, or Swipe right etc.

我搜索了一个发现如何检查多点触控:

I searched an found how to check Multitouching:

for (int i = 0; i < 10; i++) {
    if (Gdx.input.isTouched(i) == false) continue;
    float x = Gdx.input.getX(i);
    float y = Gdx.graphics.getHeight() - Gdx.input.getY(i) - 1;
    //...
}

推荐答案

这解释了一种很好的方法来实现一个系统来检测滑动的方向.我将它发布在这里，因为将来该文章可能会丢失:

This explain a very good way to implement a system to detect the direction of a swipe. I'll post it here because the article may be lost in the future:

创建一个类名 SimpleDirectionGestureDetector

Create a class name SimpleDirectionGestureDetector

public class SimpleDirectionGestureDetector extends GestureDetector {
public interface DirectionListener {
    void onLeft();

    void onRight();

    void onUp();

    void onDown();
}

public SimpleDirectionGestureDetector(DirectionListener directionListener) {
    super(new DirectionGestureListener(directionListener));
}

private static class DirectionGestureListener extends GestureAdapter{
    DirectionListener directionListener;

    public DirectionGestureListener(DirectionListener directionListener){
        this.directionListener = directionListener;
    }

    @Override
    public boolean fling(float velocityX, float velocityY, int button) {
        if(Math.abs(velocityX)>Math.abs(velocityY)){
            if(velocityX>0){
                    directionListener.onRight();
            }else{
                    directionListener.onLeft();
            }
        }else{
            if(velocityY>0){
                    directionListener.onDown();
            }else{                                  
                    directionListener.onUp();
            }
        }
        return super.fling(velocityX, velocityY, button);
    }

}

}

在 LibGdx 应用程序的 create() 函数上，将其用于激活游戏的手势处理:

On the create() function of the LibGdx application, put this to activate gesture handling for your game:

Gdx.input.setInputProcessor(new SimpleDirectionGestureDetector(new SimpleDirectionGestureDetector.DirectionListener() {

@Override
public void onUp() {

}

@Override
public void onRight() {

}

@Override
public void onLeft() {

}

@Override
public void onDown() {

}
}));

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