1 //---------------------------------------------------------------------------- 2 // Anti-Grain Geometry - Version 2.4 3 // Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com) 4 // 5 // Permission to copy, use, modify, sell and distribute this software 6 // is granted provided this copyright notice appears in all copies. 7 // This software is provided "as is" without express or implied 8 // warranty, and with no claim as to its suitability for any purpose. 9 // 10 //---------------------------------------------------------------------------- 11 // Contact: mcseem@antigrain.com 12 // mcseemagg@yahoo.com 13 // http://www.antigrain.com 14 //---------------------------------------------------------------------------- 15 16 #ifndef AGG_VCGEN_VERTEX_SEQUENCE_INCLUDED 17 #define AGG_VCGEN_VERTEX_SEQUENCE_INCLUDED 18 19 #include "agg_basics.h" 20 #include "agg_vertex_sequence.h" 21 #include "agg_shorten_path.h" 22 23 namespace agg 24 { 25 26 //===================================================vcgen_vertex_sequence 27 class vcgen_vertex_sequence 28 { 29 public: 30 typedef vertex_dist_cmd vertex_type; 31 typedef vertex_sequence<vertex_type, 6> vertex_storage; 32 vcgen_vertex_sequence()33 vcgen_vertex_sequence() : 34 m_flags(0), 35 m_cur_vertex(0), 36 m_shorten(0.0), 37 m_ready(false) 38 { 39 } 40 41 // Vertex Generator Interface 42 void remove_all(); 43 void add_vertex(double x, double y, unsigned cmd); 44 45 // Vertex Source Interface 46 void rewind(unsigned path_id); 47 unsigned vertex(double* x, double* y); 48 shorten(double s)49 void shorten(double s) { m_shorten = s; } shorten()50 double shorten() const { return m_shorten; } 51 52 private: 53 vcgen_vertex_sequence(const vcgen_vertex_sequence&); 54 const vcgen_vertex_sequence& operator = (const vcgen_vertex_sequence&); 55 56 vertex_storage m_src_vertices; 57 unsigned m_flags; 58 unsigned m_cur_vertex; 59 double m_shorten; 60 bool m_ready; 61 }; 62 63 64 //------------------------------------------------------------------------ remove_all()65 inline void vcgen_vertex_sequence::remove_all() 66 { 67 m_ready = false; 68 m_src_vertices.remove_all(); 69 m_cur_vertex = 0; 70 m_flags = 0; 71 } 72 73 //------------------------------------------------------------------------ add_vertex(double x,double y,unsigned cmd)74 inline void vcgen_vertex_sequence::add_vertex(double x, double y, unsigned cmd) 75 { 76 m_ready = false; 77 if(is_move_to(cmd)) 78 { 79 m_src_vertices.modify_last(vertex_dist_cmd(x, y, cmd)); 80 } 81 else 82 { 83 if(is_vertex(cmd)) 84 { 85 m_src_vertices.add(vertex_dist_cmd(x, y, cmd)); 86 } 87 else 88 { 89 m_flags = cmd & path_flags_mask; 90 } 91 } 92 } 93 94 95 //------------------------------------------------------------------------ rewind(unsigned)96 inline void vcgen_vertex_sequence::rewind(unsigned) 97 { 98 if(!m_ready) 99 { 100 m_src_vertices.close(is_closed(m_flags)); 101 shorten_path(m_src_vertices, m_shorten, get_close_flag(m_flags)); 102 } 103 m_ready = true; 104 m_cur_vertex = 0; 105 } 106 107 //------------------------------------------------------------------------ vertex(double * x,double * y)108 inline unsigned vcgen_vertex_sequence::vertex(double* x, double* y) 109 { 110 if(!m_ready) 111 { 112 rewind(0); 113 } 114 115 if(m_cur_vertex == m_src_vertices.size()) 116 { 117 ++m_cur_vertex; 118 return path_cmd_end_poly | m_flags; 119 } 120 121 if(m_cur_vertex > m_src_vertices.size()) 122 { 123 return path_cmd_stop; 124 } 125 126 vertex_type& v = m_src_vertices[m_cur_vertex++]; 127 *x = v.x; 128 *y = v.y; 129 return v.cmd; 130 } 131 132 133 } 134 135 #endif 136