headers/libs/agg/agg_trans_single_path.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_TRANS_SINGLE_PATH_INCLUDED
  17 #define AGG_TRANS_SINGLE_PATH_INCLUDED
  18
  19 #include "agg_basics.h"
  20 #include "agg_vertex_sequence.h"
  21
  22 namespace agg
  23 {
  24
  25     // See also: agg_trans_single_path.cpp
  26     //
  27     //-------------------------------------------------------trans_single_path
  28     class trans_single_path
  29     {
  30         enum status_e
  31         {
  32             initial,
  33             making_path,
  34             ready
  35         };
  36
  37     public:
  38         typedef vertex_sequence<vertex_dist, 6> vertex_storage;
  39
  40         trans_single_path();
  41
  42         //--------------------------------------------------------------------
  43         void   base_length(double v)  { m_base_length = v; }
  44         double base_length() const { return m_base_length; }
  45
  46         //--------------------------------------------------------------------
  47         void preserve_x_scale(bool f) { m_preserve_x_scale = f;    }
  48         bool preserve_x_scale() const { return m_preserve_x_scale; }
  49
  50         //--------------------------------------------------------------------
  51         void reset();
  52         void move_to(double x, double y);
  53         void line_to(double x, double y);
  54         void finalize_path();
  55
  56         //--------------------------------------------------------------------
  57         template<class VertexSource>
  58         void add_path(VertexSource& vs, unsigned path_id=0)
  59         {
  60             double x;
  61             double y;
  62
  63             unsigned cmd;
  64             vs.rewind(path_id);
  65             while(!is_stop(cmd = vs.vertex(&x, &y)))
  66             {
  67                 if(is_move_to(cmd))
  68                 {
  69                     move_to(x, y);
  70                 }
  71                 else
  72                 {
  73                     if(is_vertex(cmd))
  74                     {
  75                         line_to(x, y);
  76                     }
  77                 }
  78             }
  79             finalize_path();
  80         }
  81
  82         //--------------------------------------------------------------------
  83         double total_length() const;
  84         void transform(double *x, double *y) const;
  85
  86     private:
  87         vertex_storage m_src_vertices;
  88         double         m_base_length;
  89         double         m_kindex;
  90         status_e       m_status;
  91         bool           m_preserve_x_scale;
  92     };
  93
  94
  95 }
  96
  97 #endif