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[sara123 <>]

consider we have a polygon and we want to rotate it under the angle of one of
it's vertices (for example v0), i used this functions in my program:


CGAL::Rotation RTN;

typedef CGAL::Aff_transformation_2<K> tr;

tr ration_rot (RTN, sin(-ang), cos(-ang),
sin(-ang)*sin(-ang)+cos(-ang)*cos(-ang))

(ang: angle of v0 with x-axis)
(K is double)
i receive wrong result in some examples (some polygons).


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