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Segments & polygons clipping

Home Page: https://clip.rtfd.io

License: MIT License

Dockerfile 0.04% Python 99.79% PowerShell 0.08% Shell 0.08%
polygon-boolean polygon-clipping polygon-clipping-algorithm martinez-algorithm

clipping's Issues

Invalid `subtract_multipolygons` result

For 2 multipolygons

>>> left = [([(0, 0), (4, 0), (4, 4), (0, 4)], [])]
>>> right = [([(2, 4), (1, 3), (3, 3)], [])]

result of subtract_multipolygons

>>> subtract_multipolygons(left, right)
[([(0, 0), (4, 0), (4, 4), (2, 4), (3, 3), (1, 3), (2, 4), (0, 4)], [])]

or visualized

actual

which is invalid, because polygon border can't have self-intersections, it should be a hole or separate polygon instead.
Correct result should be multipolygon consisting of 1 polygon with 1 hole

[([(0, 0), (4, 0), (4, 4), (0, 4)], [[(2, 4), (1, 3), (3, 3)]])]

or visualized

expected

Invalid `symmetric_subtract_multipolygons` result

For 2 multipolygons

>>> left = [([(2, 2), (6, 2), (6, 6), (2, 6)], [])]
>>> right = [([(3, 0), (5, 0), (5, 3), (3, 3)], [])]

result of symmetric_subtract_multipolygons

>>> symmetric_subtract_multipolygons(left, right)
[([(2, 2), (3, 2), (3, 0), (5, 0), (5, 2), (6, 2), (6, 6), (2, 6)],
  [[(3, 3), (5, 3), (5, 2), (3, 2)]])]

or visualized

actual

which is invalid, because hole cannot touch polygon border in more than one point, because it tears polygon apart.
Correct result should be multipolygon consisting of 2 polygons without holes

[([(2, 2), (3, 2), (3, 3), (5, 3), (5, 2), (6, 2), (6, 6), (2, 6)], []),
 ([(3, 0), (5, 0), (5, 2), (3, 2)], [])]

or visualized
expected

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