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 <math.h>
24#include "agg_basics.h"
25
26namespace 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
75