def get_circle_points(xy, radius):
    """ Returns tuples of (x0, y0), (x1, y1) for a circle centered at x, y with radius

    Arguments:
        xy: tuple of x, y coordinates
        radius: radius of circle to draw

    Returns:
        [(x0, y0), (x1, y1)] for bounding box of circle centered at x, y
    """
    x, y = xy
    x0, y0 = x - radius, y - radius
    x1, y1 = x + radius, y + radius
    return [(x0, y0), (x1, y1)]