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#ifndef AGG_VCGEN_VERTEX_SEQUENCE_INCLUDED
17#define AGG_VCGEN_VERTEX_SEQUENCE_INCLUDED
18
19#include "agg_basics.h"
20#include "agg_vertex_sequence.h"
21#include "agg_shorten_path.h"
22
23namespace agg
24{
25
26    //===================================================vcgen_vertex_sequence
27    class vcgen_vertex_sequence
28    {
29    public:
30        typedef vertex_dist_cmd                 vertex_type;
31        typedef vertex_sequence<vertex_type, 6> vertex_storage;
32
33        vcgen_vertex_sequence() :
34            m_flags(0),
35            m_cur_vertex(0),
36            m_shorten(0.0),
37            m_ready(false)
38        {
39        }
40
41        // Vertex Generator Interface
42        void remove_all();
43        void add_vertex(double x, double y, unsigned cmd);
44
45        // Vertex Source Interface
46        void     rewind(unsigned path_id);
47        unsigned vertex(double* x, double* y);
48
49        void shorten(double s) { m_shorten = s; }
50        double shorten() const { return m_shorten; }
51
52    private:
53        vcgen_vertex_sequence(const vcgen_vertex_sequence&);
54        const vcgen_vertex_sequence& operator = (const vcgen_vertex_sequence&);
55
56        vertex_storage m_src_vertices;
57        unsigned       m_flags;
58        unsigned       m_cur_vertex;
59        double         m_shorten;
60        bool           m_ready;
61    };
62
63
64    //------------------------------------------------------------------------
65    inline void vcgen_vertex_sequence::remove_all()
66    {
67        m_ready = false;
68        m_src_vertices.remove_all();
69        m_cur_vertex = 0;
70        m_flags = 0;
71    }
72
73    //------------------------------------------------------------------------
74    inline void vcgen_vertex_sequence::add_vertex(double x, double y, unsigned cmd)
75    {
76        m_ready = false;
77        if(is_move_to(cmd))
78        {
79            m_src_vertices.modify_last(vertex_dist_cmd(x, y, cmd));
80        }
81        else
82        {
83            if(is_vertex(cmd))
84            {
85                m_src_vertices.add(vertex_dist_cmd(x, y, cmd));
86            }
87            else
88            {
89                m_flags = cmd & path_flags_mask;
90            }
91        }
92    }
93
94
95    //------------------------------------------------------------------------
96    inline void vcgen_vertex_sequence::rewind(unsigned)
97    {
98        if(!m_ready)
99        {
100            m_src_vertices.close(is_closed(m_flags));
101            shorten_path(m_src_vertices, m_shorten, get_close_flag(m_flags));
102        }
103        m_ready = true;
104        m_cur_vertex = 0;
105    }
106
107    //------------------------------------------------------------------------
108    inline unsigned vcgen_vertex_sequence::vertex(double* x, double* y)
109    {
110        if(!m_ready)
111        {
112            rewind(0);
113        }
114
115        if(m_cur_vertex == m_src_vertices.size())
116        {
117            ++m_cur_vertex;
118            return path_cmd_end_poly | m_flags;
119        }
120
121        if(m_cur_vertex > m_src_vertices.size())
122        {
123            return path_cmd_stop;
124        }
125
126        vertex_type& v = m_src_vertices[m_cur_vertex++];
127        *x = v.x;
128        *y = v.y;
129        return v.cmd;
130    }
131
132
133}
134
135#endif
136