headers/libs/agg/agg_conv_concat.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_CONV_CONCAT_INCLUDED
  17 #define AGG_CONV_CONCAT_INCLUDED
  18
  19 #include "agg_basics.h"
  20
  21 namespace agg
  22 {
  23     //=============================================================conv_concat
  24     // Concatenation of two paths. Usually used to combine lines or curves
  25     // with markers such as arrowheads
  26     template<class VS1, class VS2> class conv_concat
  27     {
  28     public:
  29         conv_concat(VS1& source1, VS2& source2) :
  30             m_source1(&source1), m_source2(&source2), m_status(2) {}
  31         void attach1(VS1& source) { m_source1 = &source; }
  32         void attach2(VS2& source) { m_source2 = &source; }
  33
  34
  35         void rewind(unsigned path_id)
  36         {
  37             m_source1->rewind(path_id);
  38             m_source2->rewind(0);
  39             m_status = 0;
  40         }
  41
  42         unsigned vertex(double* x, double* y)
  43         {
  44             unsigned cmd;
  45             if(m_status == 0)
  46             {
  47                 cmd = m_source1->vertex(x, y);
  48                 if(!is_stop(cmd)) return cmd;
  49                 m_status = 1;
  50             }
  51             if(m_status == 1)
  52             {
  53                 cmd = m_source2->vertex(x, y);
  54                 if(!is_stop(cmd)) return cmd;
  55                 m_status = 2;
  56             }
  57             return path_cmd_stop;
  58         }
  59
  60     private:
  61         conv_concat(const conv_concat<VS1, VS2>&);
  62         const conv_concat<VS1, VS2>&
  63             operator = (const conv_concat<VS1, VS2>&);
  64
  65         VS1* m_source1;
  66         VS2* m_source2;
  67         int  m_status;
  68
  69     };
  70 }
  71
  72
  73 #endif