Get a vector perpendicular to another vector

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Get a vector perpendicular to another vector

Assume the vector is defined by two points P1 P2

dx = p2_x - p1_x dy = p2_y - p1_y

p3_x = p1_x - dyp3_y = p1_y + dx

Or in the other direction

p4_x = p1_x + dyp4_y = p1_y - dx

Lastest update in December 2019, inital post in June 2011

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