Libgdx - 两个演员（英雄和硬币）碰撞后的奇怪行为

Question

我目前正在创建一个 2d 无限奔跑游戏。在我的游戏中，我有两个演员，英雄和硬币，他们的身体都设置为动态，但每次英雄击中/碰撞硬币时，英雄都会向左移动（英雄会受到硬币的影响）。

这是我的代码，我不知道我的设置是否有问题，任何帮助，将不胜感激。

public static Body createRunner(World world) {
        BodyDef bodyDef = new BodyDef();

        bodyDef.type = BodyDef.BodyType.DynamicBody;
        bodyDef.position.set(new Vector2(Constants.RUNNER_X, Constants.RUNNER_Y));
        PolygonShape shape = new PolygonShape();
        shape.setAsBox(Constants.RUNNER_WIDTH / 2, Constants.RUNNER_HEIGHT / 2);
        Body body = world.createBody(bodyDef);
        body.setGravityScale(Constants.RUNNER_GRAVITY_SCALE);    
        body.setUserData(new RunnerUserData());  
        FixtureDef fixtureDef = new FixtureDef();
        fixtureDef.shape = shape;
        fixtureDef.density = 0.0f; 
        fixtureDef.friction = 0.0f;
        fixtureDef.restitution = 0.0f; 
        body.createFixture(fixtureDef);
        body.resetMassData();
        body.setUserData(new RunnerUserData(Constants.RUNNER_WIDTH, Constants.RUNNER_HEIGHT));


        shape.dispose();
        return body;
    }

    public static Body createCoins(World world) {
        EnemyType enemyType = RandomUtils.getRandomEnemyType();
        BodyDef bodyDef = new BodyDef();
        //bodyDef used to set the enemy to make it not be affected when the runner hit
        bodyDef.type = BodyDef.BodyType.DynamicBody;
        bodyDef.position.set(new Vector2(enemyType.getX(), enemyType.getY()));
        PolygonShape shape = new PolygonShape();
        shape.setAsBox(enemyType.getWidth() / 2, enemyType.getHeight() / 2);
        Body body = world.createBody(bodyDef);
        FixtureDef fixtureDef = new FixtureDef();
        fixtureDef.shape = shape;
        fixtureDef.density = -100.0f; 
        fixtureDef.friction = 0.0f;
        fixtureDef.restitution = -50.0f; 
        body.createFixture(fixtureDef);
        body.resetMassData();
        EnemyUserData userData = new EnemyUserData(enemyType.getWidth(), enemyType.getHeight(), enemyType.getRegions());
        body.setUserData(userData);
        shape.dispose();
        return body;
    }

谢谢

Answer 1

我会通过 world.setContactFilter 将 ContactFilter 设置为您的世界实例

每当您的灯具发生碰撞时，这都会给您一个回调。如果你从这个回调中返回 false，它应该会阻止 Box2D 解决你的碰撞，这很可能是推动你的英雄离开的原因。

ContactListener listener = new ContactListneer(){
    public boolean shouldCollide(Fixture fixtureA,
                  Fixture fixtureB){
        Body bodyA = fixtureA.getBody();
        Body bodyB = fixtureB.getBody();
        /* !!! You'll need to implement this next part !!!*/
        //figure out which body is hero, which body is coin
        //if this is a collision between a hero and coin....
        {
            world.destroyBody(coinBody);
            return false;
        }
        //else
            return true;
    }
};
world.setContactFilter(contactFilter);