public class GameObject {
    public final Vector2 position;
    public final Rectangle bounds;

    public GameObject (float x, float y, float width, float height) {
        this.position = new Vector2(x, y);
        this.bounds = new Rectangle(x - width / 2, y - height / 2, width, height);
    }

public class DynamicGameObject extends GameObject {
    protected static Vector2 velocity;
    public final Vector2 accel;

    public DynamicGameObject (float x, float y, float width, float height) {
        super(x, y, width, height);
        setVelocity(new Vector2());
        accel = new Vector2();
    }

    public Vector2 getVelocity() {
        return velocity;
}

public void setVelocity(Vector2 velocity) {
    DynamicGameObject.velocity = velocity;
}
}

public Ruben (float x, float y) {
    super(x, y, RUBEN_WIDTH, RUBEN_HEIGHT);
    state = RUBEN_STATE_IDLE;
    stateTime = 0;
    grounded = true;
    facingRight = true;
    }

public void update (float deltaTime) {
    //getVelocity().add(World.gravity.x * deltaTime, World.gravity.y * deltaTime);
    position.add(velocity.x * deltaTime, velocity.y * deltaTime);
    bounds.x = position.x - bounds.width / 2;
    bounds.y = position.y - bounds.height / 2;

    if (position.x < 0) position.x = World.WORLD_WIDTH;
    if (position.x > World.WORLD_WIDTH) position.x = 0;
    stateTime += deltaTime;
}

private void updateRuben (float deltaTime, float accelX) {


    if (ruben.getState() != Ruben.RUBEN_STATE_IDLE && ruben.position.y <= 0.5f) ruben.hitPlatform();
    if (ruben.getState() != Ruben.RUBEN_STATE_IDLE) ruben.getVelocity().x = -accelX / 10 * Ruben.RUBEN_MOVE_VELOCITY;

    // clamp the velocity to the maximum, x-axis only
            if (Math.abs(ruben.getVelocity().x) > Ruben.RUBEN_MAX_VELOCITY) {
                ruben.getVelocity().x = Math.signum(ruben.getVelocity().x) * Ruben.RUBEN_MAX_VELOCITY;
            }

            // clamp the velocity to 0 if it's < 1, and set the state to standing
            if (Math.abs(ruben.getVelocity().x) < 1) {
                ruben.getVelocity().x = 0;
                if (Ruben.isGrounded()) {
                    Ruben.setState(Ruben.RUBEN_STATE_IDLE);
                }
            }

    ruben.getVelocity().scl(deltaTime);
    ruben.update(deltaTime);
    heightSoFar = Math.max(ruben.position.y, heightSoFar);
}

(GestureDetector gd = new GestureDetector(new GestureHandler(this));