前面写过C#的。
import numpy
def GetAngle(sta_point, mid_point, end_point):
ma_x = sta_point.X-mid_point.X
ma_y = sta_point.Y-mid_point.Y
mb_x = end_point.X-mid_point.X
mb_y = end_point.Y-mid_point.Y
ab_x = sta_point.X-end_point.X
ab_y = sta_point.Y-end_point.Y
ab_val2 = ab_x * ab_x + ab_y * ab_y
ma_val2 = ma_x * ma_x + ma_y * ma_y
mb_val2 = mb_x * mb_x + mb_y * mb_y
cos_M = (ma_val2+mb_val2-ab_val2) / (2 * numpy.sqrt(ma_val2)*numpy.sqrt(mb_val2))
angleAMB = numpy.arccos(cos_M)/numpy.pi * 180
return angleAMB
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