agg/inc/agg_vcgen_dash.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 // Line dash generator
  17 //
  18 //----------------------------------------------------------------------------
  19 #ifndef AGG_VCGEN_DASH_INCLUDED
  20 #define AGG_VCGEN_DASH_INCLUDED
  21
  22 #include "agg_basics.h"
  23 #include "agg_vertex_sequence.h"
  24 #include "agg_vertex_iterator.h"
  25
  26 namespace agg
  27 {
  28
  29     //---------------------------------------------------------------vcgen_dash
  30     //
  31     // See Implementation agg_vcgen_dash.cpp
  32     //
  33     class vcgen_dash
  34     {
  35         enum
  36         {
  37             max_dashes = 32
  38         };
  39
  40         enum status_e
  41         {
  42             initial,
  43             ready,
  44             polyline,
  45             stop
  46         };
  47
  48     public:
  49         typedef vertex_sequence<vertex_dist, 6> vertex_storage;
  50
  51         vcgen_dash();
  52
  53         void remove_all_dashes();
  54         void add_dash(double dash_len, double gap_len);
  55         void dash_start(double ds);
  56
  57         void shorten(double s) { m_shorten = s; }
  58         double shorten() const { return m_shorten; }
  59
  60         // Vertex Generator Interface
  61         void remove_all();
  62         void add_vertex(double x, double y, unsigned cmd);
  63
  64         // Vertex Source Interface
  65         void     rewind(unsigned id);
  66         unsigned vertex(double* x, double* y);
  67
  68         typedef vcgen_dash source_type;
  69         typedef vertex_iterator<source_type> iterator;
  70         iterator begin(unsigned id) { return iterator(*this, id); }
  71         iterator end() { return iterator(path_cmd_stop); }
  72
  73     private:
  74         vcgen_dash(const vcgen_dash&);
  75         const vcgen_dash& operator = (const vcgen_dash&);
  76
  77         void calc_dash_start(double ds);
  78
  79         double             m_dashes[max_dashes];
  80         double             m_total_dash_len;
  81         unsigned           m_num_dashes;
  82         double             m_dash_start;
  83         double             m_shorten;
  84         double             m_curr_dash_start;
  85         unsigned           m_curr_dash;
  86         double             m_curr_rest;
  87         const vertex_dist* m_v1;
  88         const vertex_dist* m_v2;
  89
  90         vertex_storage m_src_vertices;
  91         unsigned       m_closed;
  92         status_e       m_status;
  93         unsigned       m_src_vertex;
  94     };
  95
  96
  97 }
  98
  99 #endif