headers/libs/agg/agg_vcgen_vertex_sequence.h

   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
  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
  49         void shorten(double s) { m_shorten = s; }
  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     //------------------------------------------------------------------------
  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     //------------------------------------------------------------------------
  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     //------------------------------------------------------------------------
  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     //------------------------------------------------------------------------
 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