1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
//----------------------------------------------------------------------------
// Anti-Grain Geometry - Version 2.4
// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
//
// Permission to copy, use, modify, sell and distribute this software
// is granted provided this copyright notice appears in all copies.
// This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
//
//----------------------------------------------------------------------------
// Contact: mcseem@antigrain.com
// mcseemagg@yahoo.com
// http://www.antigrain.com
//----------------------------------------------------------------------------
//
// Contour generator
//
//----------------------------------------------------------------------------
#include <math.h>
#include "agg_vcgen_contour.h"
namespace agg
{
//------------------------------------------------------------------------
vcgen_contour::vcgen_contour() :
m_stroker(),
m_width(1),
m_src_vertices(),
m_out_vertices(),
m_status(initial),
m_src_vertex(0),
m_closed(0),
m_orientation(0),
m_auto_detect(false)
{
}
//------------------------------------------------------------------------
void vcgen_contour::remove_all()
{
m_src_vertices.remove_all();
m_closed = 0;
m_orientation = 0;
m_status = initial;
}
//------------------------------------------------------------------------
void vcgen_contour::add_vertex(double x, double y, unsigned cmd)
{
m_status = initial;
if(is_move_to(cmd))
{
m_src_vertices.modify_last(vertex_dist(x, y));
}
else
{
if(is_vertex(cmd))
{
m_src_vertices.add(vertex_dist(x, y));
}
else
{
if(is_end_poly(cmd))
{
m_closed = get_close_flag(cmd);
if(m_orientation == path_flags_none)
{
m_orientation = get_orientation(cmd);
}
}
}
}
}
//------------------------------------------------------------------------
void vcgen_contour::rewind(unsigned)
{
if(m_status == initial)
{
m_src_vertices.close(true);
if(m_auto_detect)
{
if(!is_oriented(m_orientation))
{
m_orientation = (calc_polygon_area(m_src_vertices) > 0.0) ?
path_flags_ccw :
path_flags_cw;
}
}
if(is_oriented(m_orientation))
{
m_stroker.width(is_ccw(m_orientation) ? m_width : -m_width);
}
}
m_status = ready;
m_src_vertex = 0;
}
//------------------------------------------------------------------------
unsigned vcgen_contour::vertex(double* x, double* y)
{
unsigned cmd = path_cmd_line_to;
while(!is_stop(cmd))
{
switch(m_status)
{
case initial:
rewind(0);
case ready:
if(m_src_vertices.size() < 2 + unsigned(m_closed != 0))
{
cmd = path_cmd_stop;
break;
}
m_status = outline;
cmd = path_cmd_move_to;
m_src_vertex = 0;
m_out_vertex = 0;
case outline:
if(m_src_vertex >= m_src_vertices.size())
{
m_status = end_poly;
break;
}
m_stroker.calc_join(m_out_vertices,
m_src_vertices.prev(m_src_vertex),
m_src_vertices.curr(m_src_vertex),
m_src_vertices.next(m_src_vertex),
m_src_vertices.prev(m_src_vertex).dist,
m_src_vertices.curr(m_src_vertex).dist);
++m_src_vertex;
m_status = out_vertices;
m_out_vertex = 0;
case out_vertices:
if(m_out_vertex >= m_out_vertices.size())
{
m_status = outline;
}
else
{
const point_d& c = m_out_vertices[m_out_vertex++];
*x = c.x;
*y = c.y;
return cmd;
}
break;
case end_poly:
if(!m_closed) return path_cmd_stop;
m_status = stop;
return path_cmd_end_poly | path_flags_close | path_flags_ccw;
case stop:
return path_cmd_stop;
}
}
return cmd;
}
}
|
