/// Test ///

    auto contactListener = EventListenerPhysicsContact::create();
    contactListener->onContactBegin = CC_CALLBACK_1(GameScene::onContactBegin, this);
    _eventDispatcher->addEventListenerWithSceneGraphPriority(contactListener, this);

//    _paddle->_controller->getEventDispatcher()->addEventListenerWithSceneGraphPriority(contactListener, this);
//    PaddleController::getEventDispatcher()->addEventListenerWithSceneGraphPriority(contactListener, this);
    schedule(CC_SCHEDULE_SELECTOR(GameScene::update));

    return true;
}

bool GameScene::onContactBegin(PhysicsContact& contact)
{
    Node *paddle = nullptr;
    Node *ball = nullptr;

    if (contact.getShapeA()->getBody()->getName() == "paddle" &&
            contact.getShapeB()->getBody()->getName() == "ball")
    {
        paddle = contact.getShapeA()->getBody()->getNode();
        ball = contact.getShapeB()->getBody()->getNode();
    }
    else if (contact.getShapeA()->getBody()->getName() == "ball" &&
            contact.getShapeB()->getBody()->getName() == "paddle")
    {
        paddle = contact.getShapeB()->getBody()->getNode();
        ball = contact.getShapeA()->getBody()->getNode();
    }

    if (ball && paddle)
    {
        int minSpeed = 600;
        int maxSpeed = 800;
        float hitDisplacement =
                (ball->getPosition().x - paddle->getPosition().x) / (paddle->getContentSize().width * paddle->getScaleX()/ 2);

        auto velocity = ball->getPhysicsBody()->getVelocity();

        float x = hitDisplacement * maxSpeed;
        float y = minSpeed + (maxSpeed - minSpeed)* fabsf(hitDisplacement);
        ball->getPhysicsBody()->setVelocity(Vec2(x,y));

        AudioPlayer::playEffect(AudioPlayer::hitPaddle);
        CCLOG("Ball collide with Paddle at %f ", hitDisplacement);

        return true;
    }
    return false;
}