[Python知识库]python计算向量夹角代码

向左为负，向右为正，标准坐标系,返回-180-180度

import math

AB = [0 ,0 ,5 ,-1]
CD = [0 ,0 ,4.5 ,4.5]
EF = [0 ,0 ,-2 ,6]
PQ = [0 ,0 ,-6 ,-1]

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

ang1 = angle(AB, CD)
print("AB和CD的夹角")
print(ang1)
ang1 = angle(CD,AB)
print("CD和AB的夹角"

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