mirror of
https://github.com/wassname/scikit-image.git
synced 2026-07-04 07:18:23 +08:00
Johannes Schönberger
28 lines
891 B
Cython
28 lines
891 B
Cython
#cython: cdivison=True
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#cython: boundscheck=False
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#cython: nonecheck=False
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#cython: wraparound=False
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cdef inline unsigned char point_in_polygon(int nr_verts, double *xp, double *yp,
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double x, double y):
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cdef int i
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cdef unsigned char c = 0
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cdef int j = nr_verts - 1
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for i in range(nr_verts):
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if (
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(((yp[i] <= y) and (y < yp[j])) or
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((yp[j] <= y) and (y < yp[i])))
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and (x < (xp[j] - xp[i]) * (y - yp[i]) / (yp[j] - yp[i]) + xp[i])
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):
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c = not c
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j = i
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return c
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cdef void points_in_polygon(int nr_verts, double *xp, double *yp,
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int nr_points, double *x, double *y,
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unsigned char *result):
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cdef int n
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for n in range(nr_points):
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result[n] = point_in_polygon(nr_verts, xp, yp, x[n], y[n])
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