agg/inc/agg_conv_transform.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 // class conv_transform
  17 //
  18 //----------------------------------------------------------------------------
  19 #ifndef AGG_CONV_TRANSFORM_INCLUDED
  20 #define AGG_CONV_TRANSFORM_INCLUDED
  21
  22 #include "agg_basics.h"
  23 #include "agg_trans_affine.h"
  24 #include "agg_vertex_iterator.h"
  25
  26 namespace agg
  27 {
  28
  29     //----------------------------------------------------------conv_transform
  30     template<class VertexSource, class Transformer=trans_affine> class conv_transform
  31     {
  32     public:
  33         conv_transform(VertexSource& source, const Transformer& tr) :
  34             m_source(&source), m_trans(&tr) {}
  35
  36         void set_source(VertexSource& source) { m_source = &source; }
  37
  38         void rewind(unsigned id)
  39         {
  40             m_source->rewind(id);
  41         }
  42
  43         unsigned vertex(double* x, double* y)
  44         {
  45             unsigned cmd = m_source->vertex(x, y);
  46             if(is_vertex(cmd))
  47             {
  48                 m_trans->transform(x, y);
  49             }
  50             return cmd;
  51         }
  52
  53         void transformer(const Transformer& tr)
  54         {
  55             m_trans = &tr;
  56         }
  57
  58         typedef conv_transform<VertexSource, Transformer> source_type;
  59         typedef vertex_iterator<source_type> iterator;
  60         iterator begin(unsigned id) { return iterator(*this, id); }
  61         iterator end() { return iterator(path_cmd_stop); }
  62
  63     private:
  64         conv_transform(const conv_transform<VertexSource>&);
  65         const conv_transform<VertexSource>&
  66             operator = (const conv_transform<VertexSource>&);
  67
  68         VertexSource*      m_source;
  69         const Transformer* m_trans;
  70     };
  71
  72
  73 }
  74
  75 #endif