def get_middle_point(xx, yy):
    """
    Roughly get the middle point of line of x, y coordinates

    :param xx: np.array , x array coordinates
    :param yy: np.array , y array coordinates
    :return: (x_center, y_center)
    """
    half = int(len(xx) / 2)
    return xx[half], yy[half]