inpolygon for Python - Examples of matplotlib.path.Path contains_points() method?

Question

I have been searching for a python alternative to MATLAB\'s inpolygon() and I have come across contains_points as a good option.

However, the docs are a little bare with

Answer 1

Make sure that the vertices are ordered as wanted. Below vertices are ordered in a way that the resulting path is a pair of triangles rather than a rectangle. So, contains_points only returns True for points inside any of the triangles.

>>> p = path.Path(np.array([bfp1, bfp2, bfp4, bfp3]))
>>> p
Path([[ 5.53147871  0.78330843]
 [ 1.78330843  5.46852129]
 [ 0.53147871 -3.21669157]
 [-3.21669157  1.46852129]], None)
>>> IsPointInside = np.array([[1, 2], [1, 9]])
>>> IsPointInside
array([[1, 2],
       [1, 9]])
>>> p.contains_points(IsPointInside)
array([False, False], dtype=bool)
>>> 

The output for the first point would have been True if bfp3 and bfp4 were swapped.