- void set_tracking(int tracking);
- std::vector<frame_geometry::coord> create_vertex_stream(const std::wstring& str, int x, int y, int parent_width, int parent_height, string_metrics* metrics);
+ void set_tracking(double tracking);
+ std::vector<frame_geometry::coord> create_vertex_stream(const std::wstring& str, int x, int y, int parent_width, int parent_height, string_metrics* metrics, double shear = 0.0);