python 已知平行四边形三个点,求第四个点的案例
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2020-12-20
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python 已知平行四边形三个点已知平行四边形三个点,求第四个点的案例求第四个点的案例
我就废话不多说了，大家还是直接看代码吧！
import numpy as np
#已知平行四边形三个点，求第四个点
#计算两点之间的距离
def CalcEuclideanDistance(point1,point2):
vec1 = np.array(point1)
vec2 = np.array(point2)
distance = np.linalg.norm(vec1 - vec2)
return distance
#计算第四个点
def CalcFourthPoint(point1,point2,point3): #pint3为A点
D = (point1[0]+point2[0]-point3[0],point1[1]+point2[1]-point3[1])
return D
#三点构成一个三角形，利用两点之间的距离，判断邻边AB和AC,利用向量法以及平行四边形法则，可以求得第四个点D
def JudgeBeveling(point1,point2,point3):
dist1 = CalcEuclideanDistance(point1,point2)
dist2 = CalcEuclideanDistance(point1,point3)
dist3 = CalcEuclideanDistance(point2,point3)
dist = [dist1, dist2, dist3] max_dist = dist.index(max(dist))
if max_dist == 0:
D = CalcFourthPoint(point1,point2,point3)
elif max_dist == 1:
D = CalcFourthPoint(point1,point3,point2)
else:
D = CalcFourthPoint(point2,point3,point1)
return D
print(JudgeBeveling((0,1),(1,0),(1,1)))
print(JudgeBeveling((5,39),(500,35),(496,17)))
补充知识：补充知识：计算图像中任意四个点连成的四边形面积与计算图像中任意四个点连成的四边形面积与Ground truth的的IOU(Python)
1.先求任意四个点连成四边形的面积先求任意四个点连成四边形的面积
这个问题可以用下面的图简单的看一下
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