LibGDX - Get Swipe Up or swipe right etc.?

问题

touch area http://imageshack.us/a/img836/2909/swipe1.png

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

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

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

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

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.

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;
    //...
}

回答1:

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:

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);
    }

}

}

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() {

}
}));

回答2:

i made a simple class to identify the direction of a swipe

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.input.GestureDetector;
import com.badlogic.gdx.math.Vector2;

/** * Created by ROHIT on 3/11/2018. */

public class swipelistener  {

public boolean isswipright(){
    if(Gdx.input.isTouched()&&Gdx.input.getDeltaX()>0)
        return true;
    return false;
}

public boolean isswipleft(){
    if(Gdx.input.isTouched()&&Gdx.input.getDeltaX()<0)
        return true;
    return false;
}

public boolean isswipup(){
    if(Gdx.input.isTouched()&&Gdx.input.getDeltaY()>0)
        return true;
    return false;
}

public boolean isswipdown(){
    if(Gdx.input.isTouched()&&Gdx.input.getDeltaX()<0)
        return true;
    return false;
}

}

All the above code uses the libGDX Gdx.input.getDeltaX() and Gdx.input.getDeltaY() to get the relative change in direction.

Hope this will help.

来源：https://stackoverflow.com/questions/15185799/libgdx-get-swipe-up-or-swipe-right-etc