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Rotation Equation - merrill541 - Nov 17, 2008 04:01 PM

Does anyone know of a general fast and simple 2D rotation equation in the form of where you input a point (x,y), it's axis (x2,y2) and the amount of rotation you want to be applied and it returns the new rotated point.

Rotation Equation - Najdorf - Nov 17, 2008 04:34 PM

Constructively (x3,y3)=(x2,y2)+cos(a)*(dx,dy)+(-dy,dx)*sin(a)

where a is the angle, dx=x-x2, dy=y-y2.