def easeOutElastic(n, amplitude=1, period=0.3):
    """An elastic tween function that overshoots the destination and then "rubber bands" into the destination.

    Args:
      n (float): The time progress, starting at 0.0 and ending at 1.0.

    Returns:
      (float) The line progress, starting at 0.0 and ending at 1.0. Suitable for passing to getPointOnLine().
    """
    _checkRange(n)

    if amplitude < 1:
        amplitude = 1
        s = period / 4
    else:
        s = period / (2 * math.pi) * math.asin(1 / amplitude)

    return amplitude * 2**(-10*n) * math.sin((n-s)*(2*math.pi / period)) + 1