def polygon(surf, points, color):
    """Draw an antialiased filled polygon on a surface"""

    gfxdraw.aapolygon(surf, points, color)
    gfxdraw.filled_polygon(surf, points, color)

    x = min([x for (x, y) in points])
    y = min([y for (x, y) in points])
    xm = max([x for (x, y) in points])
    ym = max([y for (x, y) in points])

    return pygame.Rect(x, y, xm - x, ym - y)