headers/libs/agg/agg_conv_transform.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 // 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
  25 namespace agg
  26 {
  27
  28     //----------------------------------------------------------conv_transform
  29     template<class VertexSource, class Transformer=trans_affine> class conv_transform
  30     {
  31     public:
  32         conv_transform(VertexSource& source, const Transformer& tr) :
  33             m_source(&source), m_trans(&tr) {}
  34         void attach(VertexSource& source) { m_source = &source; }
  35
  36         void rewind(unsigned path_id)
  37         {
  38             m_source->rewind(path_id);
  39         }
  40
  41         unsigned vertex(double* x, double* y)
  42         {
  43             unsigned cmd = m_source->vertex(x, y);
  44             if(is_vertex(cmd))
  45             {
  46                 m_trans->transform(x, y);
  47             }
  48             return cmd;
  49         }
  50
  51         void transformer(const Transformer& tr)
  52         {
  53             m_trans = &tr;
  54         }
  55
  56     private:
  57         conv_transform(const conv_transform<VertexSource>&);
  58         const conv_transform<VertexSource>&
  59             operator = (const conv_transform<VertexSource>&);
  60
  61         VertexSource*      m_source;
  62         const Transformer* m_trans;
  63     };
  64
  65
  66 }
  67
  68 #endif