agg/inc/agg_arc.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 // Arc vertex generator
  17 //
  18 //----------------------------------------------------------------------------
  19
  20 #ifndef AGG_ARC_INCLUDED
  21 #define AGG_ARC_INCLUDED
  22
  23 #include <math.h>
  24 #include "agg_basics.h"
  25
  26 namespace agg
  27 {
  28
  29     //=====================================================================arc
  30     //
  31     // See Implementation agg_arc.cpp
  32     //
  33     class arc
  34     {
  35     public:
  36         arc() : m_scale(1.0), m_initialized(false) {}
  37         arc(double x,  double y,
  38             double rx, double ry,
  39             double a1, double a2,
  40             bool ccw=true);
  41
  42         void init(double x,  double y,
  43                   double rx, double ry,
  44                   double a1, double a2,
  45                   bool ccw=true);
  46
  47         void approximation_scale(double s);
  48         double approximation_scale() const { return m_scale;  }
  49
  50         void rewind(unsigned);
  51         unsigned vertex(double* x, double* y);
  52
  53     private:
  54         void normalize(double a1, double a2, bool ccw);
  55
  56         double   m_x;
  57         double   m_y;
  58         double   m_rx;
  59         double   m_ry;
  60         double   m_angle;
  61         double   m_start;
  62         double   m_end;
  63         double   m_scale;
  64         double   m_da;
  65         bool     m_ccw;
  66         bool     m_initialized;
  67         unsigned m_path_cmd;
  68     };
  69
  70
  71 }
  72
  73
  74 #endif