//---------------------------------------------------------------------------- // 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_VPGEN_INCLUDED #define AGG_CONV_ADAPTOR_VPGEN_INCLUDED #include "agg_basics.h" namespace agg { //======================================================conv_adaptor_vpgen template<class VertexSource, class VPGen> class conv_adaptor_vpgen { public: explicit conv_adaptor_vpgen(VertexSource& source) : m_source(&source) {} void attach(VertexSource& source) { m_source = &source; } VPGen& vpgen() { return m_vpgen; } const VPGen& vpgen() const { return m_vpgen; } void rewind(unsigned path_id); unsigned vertex(double* x, double* y); private: conv_adaptor_vpgen(const conv_adaptor_vpgen<VertexSource, VPGen>&); const conv_adaptor_vpgen<VertexSource, VPGen>& operator = (const conv_adaptor_vpgen<VertexSource, VPGen>&); VertexSource* m_source; VPGen m_vpgen; double m_start_x; double m_start_y; unsigned m_poly_flags; int m_vertices; }; //------------------------------------------------------------------------ template<class VertexSource, class VPGen> void conv_adaptor_vpgen<VertexSource, VPGen>::rewind(unsigned path_id) { m_source->rewind(path_id); m_vpgen.reset(); m_start_x = 0; m_start_y = 0; m_poly_flags = 0; m_vertices = 0; } //------------------------------------------------------------------------ template<class VertexSource, class VPGen> unsigned conv_adaptor_vpgen<VertexSource, VPGen>::vertex(double* x, double* y) { unsigned cmd = path_cmd_stop; for(;;) { cmd = m_vpgen.vertex(x, y); if(!is_stop(cmd)) break; if(m_poly_flags && !m_vpgen.auto_unclose()) { *x = 0.0; *y = 0.0; cmd = m_poly_flags; m_poly_flags = 0; break; } if(m_vertices < 0) { if(m_vertices < -1) { m_vertices = 0; return path_cmd_stop; } m_vpgen.move_to(m_start_x, m_start_y); m_vertices = 1; continue; } double tx, ty; cmd = m_source->vertex(&tx, &ty); if(is_vertex(cmd)) { if(is_move_to(cmd)) { if(m_vpgen.auto_close() && m_vertices > 2) { m_vpgen.line_to(m_start_x, m_start_y); m_poly_flags = path_cmd_end_poly | path_flags_close; m_start_x = tx; m_start_y = ty; m_vertices = -1; continue; } m_vpgen.move_to(tx, ty); m_start_x = tx; m_start_y = ty; m_vertices = 1; } else { m_vpgen.line_to(tx, ty); ++m_vertices; } } else { if(is_end_poly(cmd)) { m_poly_flags = cmd; if(is_closed(cmd) || m_vpgen.auto_close()) { if(m_vpgen.auto_close()) m_poly_flags |= path_flags_close; if(m_vertices > 2) { m_vpgen.line_to(m_start_x, m_start_y); } m_vertices = 0; } } else { // path_cmd_stop if(m_vpgen.auto_close() && m_vertices > 2) { m_vpgen.line_to(m_start_x, m_start_y); m_poly_flags = path_cmd_end_poly | path_flags_close; m_vertices = -2; continue; } break; } } } return cmd; } } #endif