geometry.py 文件源码

def clean_cut_polygon(polygon: Polygon) -> Polygon:
    interiors = []
    interiors.extend(cut_ring(polygon.exterior))
    exteriors = [(i, ring) for (i, ring) in enumerate(interiors) if ring.is_ccw]

    with suppress(AttributeError):
        delattr(polygon, 'c3nav_cache')

    if len(exteriors) != 1:
        raise ValueError('Invalid cut polygon!')
    exterior = interiors[exteriors[0][0]]
    interiors.pop(exteriors[0][0])

    for ring in polygon.interiors:
        interiors.extend(cut_ring(ring))

    return Polygon(exterior, interiors)