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// the result is NOT a polygon; you need a subsequent call to ConvertToShape to get a real polygon
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int MakeOffset(Shape *of, double dec, JoinType join, double miter, bool do_profile=false, double cx = 0, double cy = 0, double radius = 0, NR::Matrix *i2doc = NULL);
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int MakeTweak (int mode, Shape *a, double dec, JoinType join, double miter, bool do_profile, NR::Point c, NR::Point vector, double radius, NR::Matrix *i2doc);
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int MakeTweak (int mode, Shape *a, double dec, JoinType join, double miter, bool do_profile, Geom::Point c, Geom::Point vector, double radius, Geom::Matrix *i2doc);
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int PtWinding(const NR::Point px) const; // plus rapide
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int Winding(const NR::Point px) const;