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Finding Angle between lines

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OriAlpha
OriAlpha 2018-12-24
回答： Image Analyst 2018-12-25
i need to find an angle between lines
has in the image
whats i do
Consider some random vector pointsAnnotation 2018-12-24 235825.jpg
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Image Analyst
Image Analyst 2018-12-25
I doubt you have both. What created that image?
And I'm not going to do an image processing example if you have the endpoints in a vector and can do a simple math thing like the answer below (scroll down).
OriAlpha
OriAlpha 2018-12-25
below one is not clear
could you give me again

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回答（2 个）

zb li
zb li 2018-12-25
编辑：madhan ravi 2018-12-25
A(a,b) B(c,d) C(e,f)
AB = (c-a,d-b),BC = (e-c,f-d)
cosABC = AB*BC/|AB|*|BC| = (c-a,d-b)*(e-c,f-d)/|(c-a,d-b)|*|(e-c,f-d)|
so , acos(cosABC)*180/pi
Image Analyst
Image Analyst 2018-12-25
See this link where it goes over it in extreme detail. Then use norm() and dot().

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