python点到向量的距离，夹角

图像坐标系，0,0在左上角 向右x正方向，向下y轴正方向。

y轴与标准坐标系方向相反。

      import numpy as np
      def angle(v1, v2):
          dx1 = v1[2] - v1[0]
          dy1 = -(v1[3] - v1[1])
          dx2 = v2[2] - v2[0]
          dy2 = -(v2[3] - v2[1])
          angle1 = math.atan2(dy1, dx1)
          angle1 = -int(angle1 * 180 / math.pi)
         if angle1 < 0:
              angle1 = 360 + angle1
         # print(angle1)
          angle2 = math.atan2(dy2, dx2)
          angle2 = - int(angle2 * 180 / math.pi)
         if angle2 < 0:
              angle2 = 360 + angle2
          print(angle1, angle2)
          included_angle = angle1 - angle2
         if abs(included_angle) > 180:
              included_angle = included_angle / abs(included_angle) * (360 - abs(included_angle))
         else:
              included_angle *= -1
         return included_angle
      if __name__ == '__main__':
         import math
          AB = [2, 5, 4, 1]
          CD = [2, 5, 5, 3]
          ang1 = angle(AB, CD)
          print("AB和CD的夹角")
          print(ang1)
          ang1 = angle(CD, AB)
          print("CD和AB的夹角")
          print(ang1)
          dis_long=np.sqrt((CD[3]-CD[1])**2+(CD[2]-CD[0])**2)
          print(dis_long)
          dis2= (ang1 / 180 * math.pi)*dis_long
          print(abs(dis2))
  
 

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原文链接：blog.csdn.net/jacke121/article/details/120602814