//---------------------------------------------------------------------------- // 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_ADAPTOR_VCGEN_INCLUDED #define AGG_CONV_ADAPTOR_VCGEN_INCLUDED #include "agg_basics.h" namespace agg { //------------------------------------------------------------null_markers struct null_markers { void remove_all() {} void add_vertex(double, double, unsigned) {} void prepare_src() {} void rewind(unsigned) {} unsigned vertex(double*, double*) { return path_cmd_stop; } }; //------------------------------------------------------conv_adaptor_vcgen template<class VertexSource, class Generator, class Markers=null_markers> class conv_adaptor_vcgen { enum status { initial, accumulate, generate }; public: explicit conv_adaptor_vcgen(VertexSource& source) : m_source(&source), m_status(initial) {} void attach(VertexSource& source) { m_source = &source; } Generator& generator() { return m_generator; } const Generator& generator() const { return m_generator; } Markers& markers() { return m_markers; } const Markers& markers() const { return m_markers; } void rewind(unsigned path_id) { m_source->rewind(path_id); m_status = initial; } unsigned vertex(double* x, double* y); private: // Prohibit copying conv_adaptor_vcgen(const conv_adaptor_vcgen<VertexSource, Generator, Markers>&); const conv_adaptor_vcgen<VertexSource, Generator, Markers>& operator = (const conv_adaptor_vcgen<VertexSource, Generator, Markers>&); VertexSource* m_source; Generator m_generator; Markers m_markers; status m_status; unsigned m_last_cmd; double m_start_x; double m_start_y; }; //------------------------------------------------------------------------ template<class VertexSource, class Generator, class Markers> unsigned conv_adaptor_vcgen<VertexSource, Generator, Markers>::vertex(double* x, double* y) { unsigned cmd = path_cmd_stop; bool done = false; while(!done) { switch(m_status) { case initial: m_markers.remove_all(); m_last_cmd = m_source->vertex(&m_start_x, &m_start_y); m_status = accumulate; case accumulate: if(is_stop(m_last_cmd)) return path_cmd_stop; m_generator.remove_all(); m_generator.add_vertex(m_start_x, m_start_y, path_cmd_move_to); m_markers.add_vertex(m_start_x, m_start_y, path_cmd_move_to); for(;;) { cmd = m_source->vertex(x, y); if(is_vertex(cmd)) { m_last_cmd = cmd; if(is_move_to(cmd)) { m_start_x = *x; m_start_y = *y; break; } m_generator.add_vertex(*x, *y, cmd); m_markers.add_vertex(*x, *y, path_cmd_line_to); } else { if(is_stop(cmd)) { m_last_cmd = path_cmd_stop; break; } if(is_end_poly(cmd)) { m_generator.add_vertex(*x, *y, cmd); break; } } } m_generator.rewind(0); m_status = generate; case generate: cmd = m_generator.vertex(x, y); if(is_stop(cmd)) { m_status = accumulate; break; } done = true; break; } } return cmd; } } #endif