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"
19 namespace agg
20 {
21 struct null_markers {
remove_allnull_markers22 void remove_all() {}
add_vertexnull_markers23 void add_vertex(float, float, unsigned) {}
prepare_srcnull_markers24 void prepare_src() {}
rewindnull_markers25 void rewind(unsigned) {}
vertexnull_markers26 unsigned vertex(float*, float*)
27 {
28 return path_cmd_stop;
29 }
30 };
31 template<class VertexSource,
32 class Generator,
33 class Markers = null_markers> class conv_adaptor_vcgen
34 {
35 enum status {
36 initial,
37 accumulate,
38 generate
39 };
40 public:
conv_adaptor_vcgen(VertexSource & source)41 conv_adaptor_vcgen(VertexSource& source) :
42 m_source(&source),
43 m_status(initial)
44 {}
set_source(VertexSource & source)45 void set_source(VertexSource& source)
46 {
47 m_source = &source;
48 }
generator()49 Generator& generator()
50 {
51 return m_generator;
52 }
generator()53 const Generator& generator() const
54 {
55 return m_generator;
56 }
markers()57 Markers& markers()
58 {
59 return m_markers;
60 }
markers()61 const Markers& markers() const
62 {
63 return m_markers;
64 }
rewind(unsigned path_id)65 void rewind(unsigned path_id)
66 {
67 m_source->rewind(path_id);
68 m_status = initial;
69 }
70 unsigned vertex(float* x, float* y);
71 private:
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 float m_start_x;
81 float m_start_y;
82 };
83 template<class VertexSource, class Generator, class Markers>
vertex(float * x,float * y)84 unsigned conv_adaptor_vcgen<VertexSource, Generator, Markers>::vertex(float* x, 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