Libgdx 多点触控不工作

Question

我正在开发一个游戏，我在这个游戏中使用 Libgdx 库。它可以在 Android 上运行，并且必须在一个屏幕上与两个玩家一起玩。但我无法获得其他玩家的输入。我可以和垫底玩家或顶部玩家一起玩，但不能同时玩。

这是获取输入代码：

public class PlayStateInput implements InputProcessor {

private PlayState playState;
private Vector2 touchPos;
private Vector2 bodyCord;


public PlayStateInput(PlayState playState){

    this.playState = playState;
    touchPos = new Vector2();
    bodyCord = new Vector2();

    touchPos.x=Gdx.input.getX();
    touchPos.y=Gdx.input.getY();
    bodyCord.x=playState.getGameWorld().getPaddle().getBody().getPosition().x;
    bodyCord.y=playState.getGameWorld().getPaddle().getBody().getPosition().y;

}

@Override
public boolean keyDown(int keycode) {
    return false;
}

@Override
public boolean keyUp(int keycode) {
    return false;
}

@Override
public boolean keyTyped(char character) {
    return false;
}

@Override
public boolean touchDown(int screenX, int screenY, int pointer, int button) {

    if(playState.getGameWorld().getPuck().getCircleRect().contains(screenX,screenY)){

        System.out.println("collision");
    }

    if(screenY > Gdx.graphics.getHeight()/2 && (pointer <= 2)){
        playState.getGameWorld().getPaddle2().setBottomPaddle(true);

    }

    if(screenY < Gdx.graphics.getHeight()/2 && (pointer <= 2)){
        playState.getGameWorld().getPaddle().setTopPaddle(true);
    }

    return false;
}

并在此处使用此输入：

public class Paddle implements GameObject {


private World world;
private Body body;
private Body body2;
private BodyDef bodyDef;
private BodyDef bodyDef2;
private Fixture fixture;
private Fixture fixture2;
private FixtureDef fixtureDef;
private FixtureDef fixtureDef2;


private Circle circleRect;
private Circle circleRect2;
boolean TopPaddle = false;
boolean BottomPaddle = false;

private float PPM=100f;
private float power=100f;

private Vector2 touchPos;

private Sprite sprite;

String koordinatlar;


public Paddle(World world){


    this.world = world;

    bodyDef = new BodyDef();
    bodyDef.type = BodyDef.BodyType.DynamicBody;
    bodyDef.position.set((Gdx.graphics.getWidth()/2)/PPM,(Gdx.graphics.getHeight()/3)/PPM);

    body = world.createBody(bodyDef);



    fixtureDef = new FixtureDef();
    fixtureDef.density = 1.0f;
    fixtureDef.friction = 1.0f;
    fixtureDef.restitution=0.3f;


    CircleShape circleShape = new CircleShape();
    circleShape.setRadius((Gdx.graphics.getWidth()/16)/PPM);
    fixtureDef.shape = circleShape;

    fixture = body.createFixture(fixtureDef);

    circleRect = new Circle(body.getPosition().x,body.getPosition().y,(Gdx.graphics.getWidth()/16));

    Sprite.split(ImageLoader.playButtonRegion.getTexture(),20,20);



    sprite = new Sprite(ImageLoader.paddle);
    sprite.setSize((Gdx.graphics.getWidth()/8),(Gdx.graphics.getWidth()/8));
    sprite.setPosition((Gdx.graphics.getWidth()/2)-30f,(Gdx.graphics.getHeight()/3)-30f);


    touchPos = new Vector2();

}

@Override
public void render(SpriteBatch sb) {


    sprite.draw(sb);
    sprite.setPosition(body.getPosition().x*PPM-30f,body.getPosition().y*PPM-30f);
}

@Override
public void update(float delta) {

    touchPos.x=Gdx.input.getX()/PPM;
    touchPos.y=Gdx.input.getY()/PPM;

    System.out.println(touchPos);


    if (TopPaddle) {

        body.setLinearVelocity(power*(touchPos.x-body.getPosition().x),power*(touchPos.y-body.getPosition().y));
        body.setAngularVelocity(0.0f);


        if(Gdx.input.getY()>Gdx.graphics.getHeight()/2){

            body.setLinearVelocity(0f,0f);
        }
        //System.out.println(Gdx.input.getX()+" "+Gdx.input.getY());
    }

}

我希望，我说清楚了。

Answer 1

我想我明白了你的问题，你依赖于一次只接受一个输入这一事实。因此，如果两个玩家同时提供输入，您将忽略其中一个。

有多种方法可以解决您的多点触控输入问题，但我将着手解释一种简单的技术 - 修改自 this answer。

为了让两个玩家都能接受输入，您需要两个变量 - 我将它们称为 topTouchPos 和 bottomTouchPos。这些中的每一个都将是一个 Vector2，就像您当前的 touchPos 一样，它们将按如下方式计算（在您的 update 方法中）：

//Initialise both vectors to vectors that can't be touched (negative)
Vector2 topTouchPos = new Vector2(-1,-1), bottomTouchPos = new Vector2(-1,-1);

//Two people can have up to 20 fingers (most touchscreen devices will have a lower limit anyway)
for (int i = 0; i < 20; i++) {
    //Check if this finger ID is touched
    if (Gdx.input.isTouched(i)) {
        //Classify it as either the top or bottom player
        bool bottom = Gdx.input.getY(i) > Gdx.graphics.getHeight()/2;
        if (bottom) bottomTouchPos.set(Gdx.input.getX(i), Gdx.input.getY(i));
        else topTouchPos.set(Gdx.input.getX(i), Gdx.input.getY(i));
    }
}

当您进入主游戏代码时，您必须检查两个玩家。如果 topTouchPos 或 bottomTouchPos 不是负数，则使用他们各自球员的接触值。

希望这对您有所帮助（我没有测试过任何代码，因此请注意任何拼写错误）。

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