1
2//----------------------------------------------------------------------------
3// Anti-Grain Geometry - Version 2.3
4// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
5//
6// Permission to copy, use, modify, sell and distribute this software
7// is granted provided this copyright notice appears in all copies.
8// This software is provided "as is" without express or implied
9// warranty, and with no claim as to its suitability for any purpose.
10//
11//----------------------------------------------------------------------------
12// Contact: mcseem@antigrain.com
13//          mcseemagg@yahoo.com
14//          http://www.antigrain.com
15//----------------------------------------------------------------------------
16#ifndef AGG_CONV_ADAPTOR_VCGEN_INCLUDED
17#define AGG_CONV_ADAPTOR_VCGEN_INCLUDED
18#include "agg_basics.h"
19namespace agg
20{
21struct null_markers : public CFX_Object {
22    void remove_all() {}
23    void add_vertex(FX_FLOAT, FX_FLOAT, unsigned) {}
24    void prepare_src() {}
25    void rewind(unsigned) {}
26    unsigned vertex(FX_FLOAT*, FX_FLOAT*)
27    {
28        return path_cmd_stop;
29    }
30};
31template<class VertexSource,
32         class Generator,
33         class Markers = null_markers> class conv_adaptor_vcgen : public CFX_Object
34{
35    enum status {
36        initial,
37        accumulate,
38        generate
39    };
40public:
41    conv_adaptor_vcgen(VertexSource& source) :
42        m_source(&source),
43        m_status(initial)
44    {}
45    void set_source(VertexSource& source)
46    {
47        m_source = &source;
48    }
49    Generator& generator()
50    {
51        return m_generator;
52    }
53    const Generator& generator() const
54    {
55        return m_generator;
56    }
57    Markers& markers()
58    {
59        return m_markers;
60    }
61    const Markers& markers() const
62    {
63        return m_markers;
64    }
65    void rewind(unsigned path_id)
66    {
67        m_source->rewind(path_id);
68        m_status = initial;
69    }
70    unsigned vertex(FX_FLOAT* x, FX_FLOAT* y);
71private:
72    conv_adaptor_vcgen(const conv_adaptor_vcgen<VertexSource, Generator, Markers>&);
73    const conv_adaptor_vcgen<VertexSource, Generator, Markers>&
74    operator = (const conv_adaptor_vcgen<VertexSource, Generator, Markers>&);
75    VertexSource* m_source;
76    Generator     m_generator;
77    Markers       m_markers;
78    status        m_status;
79    unsigned      m_last_cmd;
80    FX_FLOAT        m_start_x;
81    FX_FLOAT        m_start_y;
82};
83template<class VertexSource, class Generator, class Markers>
84unsigned conv_adaptor_vcgen<VertexSource, Generator, Markers>::vertex(FX_FLOAT* x, FX_FLOAT* y)
85{
86    unsigned cmd = path_cmd_stop;
87    bool done = false;
88    while(!done) {
89        switch(m_status) {
90            case initial:
91                m_markers.remove_all();
92                m_last_cmd = m_source->vertex(&m_start_x, &m_start_y);
93                m_status = accumulate;
94            case accumulate:
95                if(is_stop(m_last_cmd)) {
96                    return path_cmd_stop;
97                }
98                m_generator.remove_all();
99                m_generator.add_vertex(m_start_x, m_start_y, path_cmd_move_to);
100                m_markers.add_vertex(m_start_x, m_start_y, path_cmd_move_to);
101                for(;;) {
102                    cmd = m_source->vertex(x, y);
103                    if(is_vertex(cmd)) {
104                        m_last_cmd = cmd;
105                        if(is_move_to(cmd)) {
106                            m_start_x = *x;
107                            m_start_y = *y;
108                            break;
109                        }
110                        m_generator.add_vertex(*x, *y, cmd);
111                        m_markers.add_vertex(*x, *y, path_cmd_line_to);
112                    } else {
113                        if(is_stop(cmd)) {
114                            m_last_cmd = path_cmd_stop;
115                            break;
116                        }
117                        if(is_end_poly(cmd)) {
118                            m_generator.add_vertex(*x, *y, cmd);
119                            break;
120                        }
121                    }
122                }
123                m_generator.rewind(0);
124                m_status = generate;
125            case generate:
126                cmd = m_generator.vertex(x, y);
127                if(is_stop(cmd)) {
128                    m_status = accumulate;
129                    break;
130                }
131                done = true;
132                break;
133        }
134    }
135    return cmd;
136}
137}
138#endif
139