Java Code Examples for com.badlogic.gdx.physics.box2d.Body#getUserData()

private boolean checkContact(Contact contact) {
    // ignore not touching contacts
    if (!contact.isTouching()) return false;

    Fixture fixtureA = contact.getFixtureA();
    if (fixtureA == null) return false;

    Fixture fixtureB = contact.getFixtureB();
    if (fixtureB == null) return false;

    Body bodyA = fixtureA.getBody();
    Body bodyB = fixtureB.getBody();

    String nameA = (String) bodyA.getUserData();
    String nameB = (String) bodyB.getUserData();

    if (nameA == null || nameB == null) {               // nameless bodies, check if sound needs to be played
        checkCollisionSound(contact, bodyA, bodyB);
        return false;
    } else if (nameA.equals(ObjectName.EDGE_SENSOR_NAME) || nameB.equals(ObjectName.EDGE_SENSOR_NAME)) {    // check edges
        Log.d(TAG, "onUpdate: OFF THE EDGE");

        setBallOut();

        return true;
    } else if (nameA.equals(ObjectName.SINKHOLE_NAME) || nameB.equals(ObjectName.SINKHOLE_NAME)) {  // check sinkhole
        Log.d(TAG, "onUpdate: SINKHOLE");

        setLevelComplete();

        return true;
    }

    return false;
}
 

public static boolean bodyInBounds(Body body) {
    UserData userData = (UserData) body.getUserData();

    switch (userData.getUserDataType()) {
        case RUNNER:
        case ENEMY:
            return body.getPosition().x + userData.getWidth() / 2 > 0;
    }

    return true;
}
 

private void ifCarThenCollide (Contact contact, Fixture f, Fixture other, ContactImpulse impulse) {
	Body body = f.getBody();
	Object userData = f.getUserData();
	if ((body != null) && (userData == CarType.PlayerCar || userData == CarType.ReplayCar)) {
		Car car = (Car)body.getUserData();
		float[] impulses = impulse.getNormalImpulses();
		tmpVec2.set(impulses[0], impulses[1]);

		// dbg
		Fixture fcar = null;
		if (contact.getFixtureA().getUserData() == CarType.PlayerCar) {
			fcar = contact.getFixtureA();
		} else if (contact.getFixtureB().getUserData() == CarType.PlayerCar) {
			fcar = contact.getFixtureB();
		}

		// assumes perfect side collision
		float front_ratio = 0.5f;

		// compute median front/rear ratio for collision points
		if (fcar != null) {
			front_ratio = 0;
			float ml = car.getCarModel().length;
			float half_ml = ml * 0.5f;
			Vector2[] pts = contact.getWorldManifold().getPoints();

			int num_points = contact.getWorldManifold().getNumberOfContactPoints();
			for (int i = 0; i < num_points; i++) {
				Vector2 lp = fcar.getBody().getLocalPoint(pts[i]);

				// examine front/rear ratio
				float r = MathUtils.clamp(lp.y + half_ml, 0, ml);
				r /= ml;
				front_ratio += r;
			}

			front_ratio /= (float)num_points;
			// Gdx.app.log("Cntct", "" + front_ratio);
		}
		// dbg

		car.onCollide(other, tmpVec2, front_ratio);
	}
}
 

public GameActor(Body body) {
    this.body = body;
    this.userData = (UserData) body.getUserData();
    screenRectangle = new Rectangle();
}
 

public static boolean bodyIsEnemy(Body body) {
    UserData userData = (UserData) body.getUserData();

    return userData != null && userData.getUserDataType() == UserDataType.ENEMY;
}
 

public static boolean bodyIsRunner(Body body) {
    UserData userData = (UserData) body.getUserData();

    return userData != null && userData.getUserDataType() == UserDataType.RUNNER;
}
 

public static boolean bodyIsGround(Body body) {
    UserData userData = (UserData) body.getUserData();

    return userData != null && userData.getUserDataType() == UserDataType.GROUND;
}
 

@Override
public void render(float delta) {
	/* Clear screen with a black background */
	Gdx.gl.glClearColor(1, 1, 1, 1);
	Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);

	/* Render all graphics before do physics step */
	debugRenderer.render(world, camera.combined);

	/*
	 * Set projection matrix to camera.combined, the same way we did with
	 * the debug renderer.
	 */
	batch.setProjectionMatrix(camera.combined);
	batch.begin();

	/* Get word bodies */
	world.getBodies(worldBodies);

	/*
	 * For each body in the world we have to check if it has user data
	 * associated and if it is an Sprite. In that case, we draw it in the
	 * screen.
	 */
	for (Body body : worldBodies) {
		if (body.getUserData() instanceof Sprite) {
			Sprite sprite = (Sprite) body.getUserData();

			/*
			 * Set body position equals to box position. We also need to
			 * center it in the box (measures are relative to body center).
			 */
			Vector2 position = body.getPosition();
			sprite.setPosition(position.x - sprite.getWidth() / 2,
					position.y - sprite.getWidth() / 2);

			/* Set sprite rotation equals to body rotation */
			sprite.setRotation(body.getAngle() * MathUtils.radiansToDegrees);

			/* Draw the sprite on screen */
			sprite.draw(batch);
		}
	}

	batch.end();

	/* Step the simulation with a fixed time step of 1/60 of a second */
	world.step(1 / 60f, 6, 2);
}