c# - Calculating direction of rotation -

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if have 4 points in 2d space, rotated m degrees, best/ efficient way determine direction(clockwise/counter clockwise) of rotation.

i know point before , after rotation.

i have tried taking account lowest point , highest point (based on y value) , comparing x difference e.g. (+ve or -ve) not seem reliable , doubt efficient solution.

any point if have both before , after coordinates. take cross product of before after. sign of resultant vector tell clockwise (-) or counterclockwise(+).


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