agg/inc/agg_conv_unclose_polygon.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_UNCLOSE_POLYGON_INCLUDED
  17 #define AGG_CONV_UNCLOSE_POLYGON_INCLUDED
  18
  19 #include "agg_basics.h"
  20 #include "agg_vertex_iterator.h"
  21
  22 namespace agg
  23 {
  24     //====================================================conv_unclose_polygon
  25     template<class VertexSource> class conv_unclose_polygon
  26     {
  27     public:
  28         conv_unclose_polygon(VertexSource& vs) : m_source(&vs) {}
  29
  30         void set_source(VertexSource& source) { m_source = &source; }
  31
  32         void rewind(unsigned path_id)
  33         {
  34             m_source->rewind(path_id);
  35         }
  36
  37         unsigned vertex(double* x, double* y)
  38         {
  39             unsigned cmd = m_source->vertex(x, y);
  40             if(is_end_poly(cmd)) cmd &= ~path_flags_close;
  41             return cmd;
  42         }
  43
  44         typedef conv_unclose_polygon<VertexSource> source_type;
  45         typedef vertex_iterator<source_type> iterator;
  46         iterator begin(unsigned id) { return iterator(*this, id); }
  47         iterator end() { return iterator(path_cmd_stop); }
  48
  49     private:
  50         conv_unclose_polygon(const conv_unclose_polygon<VertexSource>&);
  51         const conv_unclose_polygon<VertexSource>&
  52             operator = (const conv_unclose_polygon<VertexSource>&);
  53
  54         VertexSource* m_source;
  55     };
  56
  57 }
  58
  59 #endif