agg/inc/agg_conv_concat.h

   1 //----------------------------------------------------------------------------
   2 // Anti-Grain Geometry - Version 2.3
   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 #include "agg_vertex_iterator.h"
  21
  22 namespace agg
  23 {
  24     //=============================================================conv_concat
  25     // Concatenation of two paths. Usually used to combine lines or curves
  26     // with markers such as arrowheads
  27     template<class VS1, class VS2> class conv_concat
  28     {
  29     public:
  30         conv_concat(VS1& source1, VS2& source2) :
  31             m_source1(&source1), m_source2(&source2), m_status(2) {}
  32
  33         void set_source1(VS1& source) { m_source1 = &source; }
  34         void set_source2(VS2& source) { m_source2 = &source; }
  35
  36
  37         void rewind(unsigned id)
  38         {
  39             m_source1->rewind(id);
  40             m_source2->rewind(0);
  41             m_status = 0;
  42         }
  43
  44         unsigned vertex(double* x, double* y)
  45         {
  46             unsigned cmd;
  47             if(m_status == 0)
  48             {
  49                 cmd = m_source1->vertex(x, y);
  50                 if(!is_stop(cmd)) return cmd;
  51                 m_status = 1;
  52             }
  53             if(m_status == 1)
  54             {
  55                 cmd = m_source2->vertex(x, y);
  56                 if(!is_stop(cmd)) return cmd;
  57                 m_status = 2;
  58             }
  59             return path_cmd_stop;
  60         }
  61
  62         typedef conv_concat<VS1, VS2> source_type;
  63         typedef vertex_iterator<source_type> iterator;
  64         iterator begin(unsigned id) { return iterator(*this, id); }
  65         iterator end() { return iterator(path_cmd_stop); }
  66
  67     private:
  68         conv_concat(const conv_concat<VS1, VS2>&);
  69         const conv_concat<VS1, VS2>&
  70             operator = (const conv_concat<VS1, VS2>&);
  71
  72         VS1* m_source1;
  73         VS2* m_source2;
  74         int  m_status;
  75
  76     };
  77 }
  78
  79
  80 #endif