void RotatePoints(const double angle, const IPoint point);
IPoint GetPolyCentroid(const int16 poly);
void RotatePolyAroundCentroid(const int16 poly, const double angle);
void RotatePoints(const double angle, const IPoint point);
IPoint GetPolyCentroid(const int16 poly);
void RotatePolyAroundCentroid(const int16 poly, const double angle);