headers/libs/agg/agg_conv_marker.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 // conv_marker
  17 //
  18 //----------------------------------------------------------------------------
  19 #ifndef AGG_CONV_MARKER_INCLUDED
  20 #define AGG_CONV_MARKER_INCLUDED
  21
  22 #include "agg_basics.h"
  23 #include "agg_trans_affine.h"
  24
  25 namespace agg
  26 {
  27     //-------------------------------------------------------------conv_marker
  28     template<class MarkerLocator, class MarkerShapes>
  29     class conv_marker
  30     {
  31     public:
  32         conv_marker(MarkerLocator& ml, MarkerShapes& ms);
  33
  34         trans_affine& transform() { return m_transform; }
  35         const trans_affine& transform() const { return m_transform; }
  36
  37         void rewind(unsigned path_id);
  38         unsigned vertex(double* x, double* y);
  39
  40     private:
  41         conv_marker(const conv_marker<MarkerLocator, MarkerShapes>&);
  42         const conv_marker<MarkerLocator, MarkerShapes>&
  43             operator = (const conv_marker<MarkerLocator, MarkerShapes>&);
  44
  45         enum status_e
  46         {
  47             initial,
  48             markers,
  49             polygon,
  50             stop
  51         };
  52
  53         MarkerLocator* m_marker_locator;
  54         MarkerShapes*  m_marker_shapes;
  55         trans_affine   m_transform;
  56         trans_affine   m_mtx;
  57         status_e       m_status;
  58         unsigned       m_marker;
  59         unsigned       m_num_markers;
  60     };
  61
  62
  63     //------------------------------------------------------------------------
  64     template<class MarkerLocator, class MarkerShapes>
  65     conv_marker<MarkerLocator, MarkerShapes>::conv_marker(MarkerLocator& ml, MarkerShapes& ms) :
  66         m_marker_locator(&ml),
  67         m_marker_shapes(&ms),
  68         m_status(initial),
  69         m_marker(0),
  70         m_num_markers(1)
  71     {
  72     }
  73
  74
  75     //------------------------------------------------------------------------
  76     template<class MarkerLocator, class MarkerShapes>
  77     void conv_marker<MarkerLocator, MarkerShapes>::rewind(unsigned)
  78     {
  79         m_status = initial;
  80         m_marker = 0;
  81         m_num_markers = 1;
  82     }
  83
  84
  85     //------------------------------------------------------------------------
  86     template<class MarkerLocator, class MarkerShapes>
  87     unsigned conv_marker<MarkerLocator, MarkerShapes>::vertex(double* x, double* y)
  88     {
  89         unsigned cmd = path_cmd_move_to;
  90         double x1, y1, x2, y2;
  91
  92         while(!is_stop(cmd))
  93         {
  94             switch(m_status)
  95             {
  96             case initial:
  97                 if(m_num_markers == 0)
  98                 {
  99                    cmd = path_cmd_stop;
 100                    break;
 101                 }
 102                 m_marker_locator->rewind(m_marker);
 103                 ++m_marker;
 104                 m_num_markers = 0;
 105                 m_status = markers;
 106
 107             case markers:
 108                 if(is_stop(m_marker_locator->vertex(&x1, &y1)))
 109                 {
 110                     m_status = initial;
 111                     break;
 112                 }
 113                 if(is_stop(m_marker_locator->vertex(&x2, &y2)))
 114                 {
 115                     m_status = initial;
 116                     break;
 117                 }
 118                 ++m_num_markers;
 119                 m_mtx = m_transform;
 120                 m_mtx *= trans_affine_rotation(atan2(y2 - y1, x2 - x1));
 121                 m_mtx *= trans_affine_translation(x1, y1);
 122                 m_marker_shapes->rewind(m_marker - 1);
 123                 m_status = polygon;
 124
 125             case polygon:
 126                 cmd = m_marker_shapes->vertex(x, y);
 127                 if(is_stop(cmd))
 128                 {
 129                     cmd = path_cmd_move_to;
 130                     m_status = markers;
 131                     break;
 132                 }
 133                 m_mtx.transform(x, y);
 134                 return cmd;
 135
 136             case stop:
 137                 cmd = path_cmd_stop;
 138                 break;
 139             }
 140         }
 141         return cmd;
 142     }
 143
 144 }
 145
 146
 147 #endif
 148