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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 OUT
from constants import RIGHT from constants import RIGHT
from constants import PI
from constants import TAU
from functools import reduce from functools import reduce
from utils.iterables import adjacent_pairs
# Matrix operations # Matrix operations
@ -164,3 +167,12 @@ def line_intersection(line1, line2):
x = det(d, x_diff) / div x = det(d, x_diff) / div
y = det(d, y_diff) / div y = det(d, y_diff) / div
return np.array([x, y, 0]) 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