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Rotation of 90 degrees
(x,y) → (-y,x)
Rotation of 180 degrees
(x,y) → (-x,-y)
(BOTH clockwise, and counter-clockwise)
Rotation of 270 degrees
(x,y) → (y,-x)
Rotation of -90 degrees
(x,y) → (y,-x)
Rotation of -270 degrees
(x,y) → (-y,x)
Rotation of 360 degrees
(x,y) = (x,y)
(complete rotation)