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get_winding_number

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Grant Sanderson
2018-08-28 09:45:12 -07:00
parent 6a225211a5
commit ce1eb4eb15
1 changed files with 12 additions and 0 deletions
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12
utils/space_ops.py
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@ -2,7 +2,10 @@ import numpy as np
from constants import OUT
from constants import RIGHT
from constants import PI
from constants import TAU
from functools import reduce
from utils.iterables import adjacent_pairs
# Matrix operations
@ -164,3 +167,12 @@ def line_intersection(line1, line2):
x = det(d, x_diff) / div
y = det(d, y_diff) / div
return np.array([x, y, 0])
def get_winding_number(points):
total_angle = 0
for p1, p2 in adjacent_pairs(points):
d_angle = angle_of_vector(p2) - angle_of_vector(p1)
d_angle = ((d_angle + PI) % TAU) - PI
total_angle += d_angle
return total_angle / TAU