Rotation Equation

Posts: 40
Joined: 2008.10
Post: #1
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.
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Posts: 749
Joined: 2003.01
Post: #2
Constructively (x3,y3)=(x2,y2)+cos(a)*(dx,dy)+(-dy,dx)*sin(a)

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

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