这里有两个错误。
如果我进行这些修改,我会得到一个有意义的结果:
import numpy as np
points = np.array([[343.8998, 168.1526], [351.2377, 173.7503], [353.531, 182.72]])
A = points[2] - points[0]
B = points[1] - points[0]
C = points[2] - points[1]
angles = []
for e1, e2 in ((A, B), (A, C), (B, -C)):
num = np.dot(e1, e2)
denom = np.linalg.norm(e1) * np.linalg.norm(e2)
angles.append(np.arccos(num/denom) * 180 / np.pi)
print angles
print sum(angles)
打印出
[19.191300537488704, 19.12889310421054, 141.67980635830079]
180.0
我可能会让事情变得更加对称,并使用循环的 A、B、C 向量且总和为零:
import numpy as np
points = np.array([[343.8998, 168.1526], [351.2377, 173.7503], [353.531, 182.72]])
A = points[1] - points[0]
B = points[2] - points[1]
C = points[0] - points[2]
angles = []
for e1, e2 in ((A, -B), (B, -C), (C, -A)):
num = np.dot(e1, e2)
denom = np.linalg.norm(e1) * np.linalg.norm(e2)
angles.append(np.arccos(num/denom) * 180 / np.pi)
print angles
print sum(angles)
打印出
[141.67980635830079, 19.12889310421054, 19.191300537488704]
180.0
点积中的负号是因为我们试图获得内角。
很抱歉,我们在您需要的时候关闭了问题,把您赶走了。