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