What is the angle of vector conecting two points?

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评论： K M Ibrahim Khalilullah 2016-5-19

Suppose I have two points P1(x1,y1) and P2(x2,y2). How can I calculate angle of vector connecting the two points?

TastyPastry 2016-5-19

The angle of the vector and what? The x or y axis?

no, for pixels of an image. It is related to the direction...

KSSV 2016-5-19

Angle means, it shall be anti-clockwise with respect to x -axis... use: theta = atan((y2-y1)/(x2-x1))

thanks for reply>>Actually I need directional vector of the line connecting two point.

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