Posted by julie on Sunday, March 7, 2010 at 4:57pm.
Let
P=(x0,y0), original position of a point P
P1=(x1, y1), position of P after rotation through an angle θ.
P1=RP
where
R=rotation matrix in two dimensional space about the origin:
cos(θ) sin(θ)
-sin(θ) cos(θ)
For more information, look up:
http://en.wikipedia.org/wiki/Cartesian_coordinate_system
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