headers/libs/agg/agg_vcgen_dash.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 // 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
  25 namespace agg
  26 {
  27
  28     //---------------------------------------------------------------vcgen_dash
  29     //
  30     // See Implementation agg_vcgen_dash.cpp
  31     //
  32     class vcgen_dash
  33     {
  34         enum max_dashes_e
  35         {
  36             max_dashes = 32
  37         };
  38
  39         enum status_e
  40         {
  41             initial,
  42             ready,
  43             polyline,
  44             stop
  45         };
  46
  47     public:
  48         typedef vertex_sequence<vertex_dist, 6> vertex_storage;
  49
  50         vcgen_dash();
  51
  52         void remove_all_dashes();
  53         void add_dash(double dash_len, double gap_len);
  54         void dash_start(double ds);
  55
  56         void shorten(double s) { m_shorten = s; }
  57         double shorten() const { return m_shorten; }
  58
  59         // Vertex Generator Interface
  60         void remove_all();
  61         void add_vertex(double x, double y, unsigned cmd);
  62
  63         // Vertex Source Interface
  64         void     rewind(unsigned path_id);
  65         unsigned vertex(double* x, double* y);
  66
  67     private:
  68         vcgen_dash(const vcgen_dash&);
  69         const vcgen_dash& operator = (const vcgen_dash&);
  70
  71         void calc_dash_start(double ds);
  72
  73         double             m_dashes[max_dashes];
  74         double             m_total_dash_len;
  75         unsigned           m_num_dashes;
  76         double             m_dash_start;
  77         double             m_shorten;
  78         double             m_curr_dash_start;
  79         unsigned           m_curr_dash;
  80         double             m_curr_rest;
  81         const vertex_dist* m_v1;
  82         const vertex_dist* m_v2;
  83
  84         vertex_storage m_src_vertices;
  85         unsigned       m_closed;
  86         status_e       m_status;
  87         unsigned       m_src_vertex;
  88     };
  89
  90
  91 }
  92
  93 #endif