agg/inc/agg_vpgen_clip_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_VPGEN_CLIP_POLYGON_INCLUDED
  17 #define AGG_VPGEN_CLIP_POLYGON_INCLUDED
  18
  19 #include "agg_basics.h"
  20
  21 namespace agg
  22 {
  23
  24     //======================================================vpgen_clip_polygon
  25     //
  26     // See Implementation agg_vpgen_clip_polygon.cpp
  27     //
  28     class vpgen_clip_polygon
  29     {
  30     public:
  31         vpgen_clip_polygon() :
  32             m_clip_box(0, 0, 1, 1),
  33             m_x1(0),
  34             m_y1(0),
  35             m_clip_flags(0),
  36             m_num_vertices(0),
  37             m_vertex(0),
  38             m_cmd(path_cmd_move_to)
  39         {
  40         }
  41
  42         void clip_box(double _x1, double _y1, double _x2, double _y2)
  43         {
  44             m_clip_box.x1 = _x1;
  45             m_clip_box.y1 = _y1;
  46             m_clip_box.x2 = _x2;
  47             m_clip_box.y2 = _y2;
  48             m_clip_box.normalize();
  49         }
  50
  51
  52         double x1() const { return m_clip_box.x1; }
  53         double y1() const { return m_clip_box.y1; }
  54         double x2() const { return m_clip_box.x2; }
  55         double y2() const { return m_clip_box.y2; }
  56
  57         static bool auto_close()   { return true;  }
  58         static bool auto_unclose() { return false; }
  59
  60         void     reset();
  61         void     move_to(double x, double y);
  62         void     line_to(double x, double y);
  63         unsigned vertex(double* x, double* y);
  64
  65     private:
  66         unsigned clipping_flags(double x, double y);
  67
  68     private:
  69         rect_d        m_clip_box;
  70         double        m_x1;
  71         double        m_y1;
  72         unsigned      m_clip_flags;
  73         double        m_x[4];
  74         double        m_y[4];
  75         unsigned      m_num_vertices;
  76         unsigned      m_vertex;
  77         unsigned      m_cmd;
  78     };
  79
  80 }
  81
  82
  83 #endif