rotate vector around center.

2016 9 12
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更新时间：2016 9 14
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Hi,
I have a non linear vector that I am trying to rotate with 2.8 degrees. In my case however I want to make the rotation around the center of my vector. Can you give me a tip on how to rotate around the center. I only found out how to rotate around the origin.
Vector is included in attachment.
Thank you! Liza

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回答（1 个）

KSSV
KSSV 2016-9-12

1 个投票

If the center is (x,y) you first subtract (x,y) from all the coordinates, then use your rotation matrix, then add the (x,y) back to the point obtained.

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Liza Marie de Wit
Liza Marie de Wit 2016-9-12
Thank you. This would work for a linear vector. But it's actually about a non linear vector, see attachment. I am sorry for the non clarity!
KSSV
KSSV 2016-9-14
what do you mean by a non linear vector?

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