//---------------------------------------------------------------------------- // Anti-Grain Geometry - Version 2.4 // Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com) // // Permission to copy, use, modify, sell and distribute this software // is granted provided this copyright notice appears in all copies. // This software is provided "as is" without express or implied // warranty, and with no claim as to its suitability for any purpose. // //---------------------------------------------------------------------------- // Contact: mcseem@antigrain.com // mcseemagg@yahoo.com // http://www.antigrain.com //---------------------------------------------------------------------------- #ifndef AGG_CONV_CLOSE_POLYGON_INCLUDED #define AGG_CONV_CLOSE_POLYGON_INCLUDED #include "agg_basics.h" namespace agg { //======================================================conv_close_polygon template<class VertexSource> class conv_close_polygon { public: explicit conv_close_polygon(VertexSource& vs) : m_source(&vs) {} void attach(VertexSource& source) { m_source = &source; } void rewind(unsigned path_id); unsigned vertex(double* x, double* y); private: conv_close_polygon(const conv_close_polygon<VertexSource>&); const conv_close_polygon<VertexSource>& operator = (const conv_close_polygon<VertexSource>&); VertexSource* m_source; unsigned m_cmd[2]; double m_x[2]; double m_y[2]; unsigned m_vertex; bool m_line_to; }; //------------------------------------------------------------------------ template<class VertexSource> void conv_close_polygon<VertexSource>::rewind(unsigned path_id) { m_source->rewind(path_id); m_vertex = 2; m_line_to = false; } //------------------------------------------------------------------------ template<class VertexSource> unsigned conv_close_polygon<VertexSource>::vertex(double* x, double* y) { unsigned cmd = path_cmd_stop; for(;;) { if(m_vertex < 2) { *x = m_x[m_vertex]; *y = m_y[m_vertex]; cmd = m_cmd[m_vertex]; ++m_vertex; break; } cmd = m_source->vertex(x, y); if(is_end_poly(cmd)) { cmd |= path_flags_close; break; } if(is_stop(cmd)) { if(m_line_to) { m_cmd[0] = path_cmd_end_poly | path_flags_close; m_cmd[1] = path_cmd_stop; m_vertex = 0; m_line_to = false; continue; } break; } if(is_move_to(cmd)) { if(m_line_to) { m_x[0] = 0.0; m_y[0] = 0.0; m_cmd[0] = path_cmd_end_poly | path_flags_close; m_x[1] = *x; m_y[1] = *y; m_cmd[1] = cmd; m_vertex = 0; m_line_to = false; continue; } break; } if(is_vertex(cmd)) { m_line_to = true; break; } } return cmd; } } #endif