@staticmethod
def in_out_quint(progress):
    """.. image:: images/anim_in_out_quint.png
        """
    p = progress * 2
    if p < 1:
        return 0.5 * p * p * p * p * p
    p -= 2.0
    return 0.5 * (p * p * p * p * p + 2.0)
