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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
|
//----------------------------------------------------------------------------
// Anti-Grain Geometry - Version 2.3
// 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
//----------------------------------------------------------------------------
#ifndef AGG_RASTERIZER_OUTLINE_AA_INCLUDED
#define AGG_RASTERIZER_OUTLINE_AA_INCLUDED
#include "agg_basics.h"
#include "agg_line_aa_basics.h"
#include "agg_vertex_sequence.h"
namespace agg
{
//-------------------------------------------------------------------------
inline bool cmp_dist_start(int d) { return d > 0; }
inline bool cmp_dist_end(int d) { return d <= 0; }
//-----------------------------------------------------------line_aa_vertex
// Vertex (x, y) with the distance to the next one. The last vertex has
// the distance between the last and the first points
struct line_aa_vertex
{
int x;
int y;
int len;
line_aa_vertex() {}
line_aa_vertex(int x_, int y_) :
x(x_),
y(y_),
len(0)
{
}
bool operator () (const line_aa_vertex& val)
{
double dx = val.x - x;
double dy = val.y - y;
return (len = int(sqrt(dx * dx + dy * dy))) >
(line_subpixel_size + line_subpixel_size / 2);
}
};
//=======================================================rasterizer_outline_aa
template<class Renderer> class rasterizer_outline_aa
{
private:
//------------------------------------------------------------------------
struct draw_vars
{
unsigned idx;
int x1, y1, x2, y2;
line_parameters curr, next;
int lcurr, lnext;
int xb1, yb1, xb2, yb2;
unsigned flags;
};
void draw(draw_vars& dv, unsigned start, unsigned end);
public:
typedef line_aa_vertex vertex_type;
typedef vertex_sequence<vertex_type, 6> vertex_storage_type;
rasterizer_outline_aa(Renderer& ren) :
m_ren(ren),
m_accurate_join(m_ren.accurate_join_only()),
m_round_cap(false),
m_start_x(0),
m_start_y(0)
{
}
//------------------------------------------------------------------------
void accurate_join(bool v)
{
m_accurate_join = m_ren.accurate_join_only() ? true : v;
}
bool accurate_join() const { return m_accurate_join; }
//------------------------------------------------------------------------
void round_cap(bool v) { m_round_cap = v; }
bool round_cap() const { return m_round_cap; }
//------------------------------------------------------------------------
void move_to(int x, int y)
{
m_src_vertices.modify_last(vertex_type(m_start_x = x, m_start_y = y));
}
//------------------------------------------------------------------------
void line_to(int x, int y)
{
m_src_vertices.add(vertex_type(x, y));
}
//------------------------------------------------------------------------
void move_to_d(double x, double y)
{
move_to(line_coord(x), line_coord(y));
}
//------------------------------------------------------------------------
void line_to_d(double x, double y)
{
line_to(line_coord(x), line_coord(y));
}
//------------------------------------------------------------------------
void render(bool close_polygon);
//------------------------------------------------------------------------
void add_vertex(double x, double y, unsigned cmd)
{
if(is_move_to(cmd))
{
render(false);
move_to_d(x, y);
}
else
{
if(is_end_poly(cmd))
{
render(is_closed(cmd));
if(is_closed(cmd))
{
move_to(m_start_x, m_start_y);
}
}
else
{
line_to_d(x, y);
}
}
}
//------------------------------------------------------------------------
template<class VertexSource>
void add_path(VertexSource& vs, unsigned id=0)
{
double x;
double y;
unsigned cmd;
vs.rewind(id);
while(!is_stop(cmd = vs.vertex(&x, &y)))
{
add_vertex(x, y, cmd);
}
render(false);
}
//------------------------------------------------------------------------
template<class VertexSource, class ColorStorage, class PathId>
void render_all_paths(VertexSource& vs,
const ColorStorage& colors,
const PathId& id,
unsigned num_paths)
{
for(unsigned i = 0; i < num_paths; i++)
{
m_ren.color(colors[i]);
add_path(vs, id[i]);
}
}
//------------------------------------------------------------------------
template<class Ctrl> void render_ctrl(Ctrl& c)
{
unsigned i;
for(i = 0; i < c.num_paths(); i++)
{
m_ren.color(c.color(i));
add_path(c, i);
}
}
private:
rasterizer_outline_aa(const rasterizer_outline_aa<Renderer>&);
const rasterizer_outline_aa<Renderer>& operator =
(const rasterizer_outline_aa<Renderer>&);
Renderer& m_ren;
vertex_storage_type m_src_vertices;
bool m_accurate_join;
bool m_round_cap;
int m_start_x;
int m_start_y;
};
//----------------------------------------------------------------------------
template<class Renderer>
void rasterizer_outline_aa<Renderer>::draw(draw_vars& dv, unsigned start, unsigned end)
{
unsigned i;
const vertex_storage_type::value_type* v;
for(i = start; i < end; i++)
{
switch(dv.flags)
{
case 0: m_ren.line3(dv.curr, dv.xb1, dv.yb1, dv.xb2, dv.yb2); break;
case 1: m_ren.line2(dv.curr, dv.xb2, dv.yb2); break;
case 2: m_ren.line1(dv.curr, dv.xb1, dv.yb1); break;
case 3: m_ren.line0(dv.curr); break;
}
dv.x1 = dv.x2;
dv.y1 = dv.y2;
dv.lcurr = dv.lnext;
dv.lnext = m_src_vertices[dv.idx].len;
++dv.idx;
if(dv.idx >= m_src_vertices.size()) dv.idx = 0;
v = &m_src_vertices[dv.idx];
dv.x2 = v->x;
dv.y2 = v->y;
dv.curr = dv.next;
dv.next = line_parameters(dv.x1, dv.y1, dv.x2, dv.y2, dv.lnext);
dv.xb1 = dv.xb2;
dv.yb1 = dv.yb2;
if(m_accurate_join)
{
dv.flags = 0;
}
else
{
dv.flags >>= 1;
dv.flags |= ((dv.curr.diagonal_quadrant() ==
dv.next.diagonal_quadrant()) << 1);
}
if((dv.flags & 2) == 0)
{
bisectrix(dv.curr, dv.next, &dv.xb2, &dv.yb2);
}
}
}
//----------------------------------------------------------------------------
template<class Renderer>
void rasterizer_outline_aa<Renderer>::render(bool close_polygon)
{
m_src_vertices.close(close_polygon);
draw_vars dv;
const vertex_storage_type::value_type* v;
int x1;
int y1;
int x2;
int y2;
int lprev;
if(close_polygon)
{
if(m_src_vertices.size() >= 3)
{
dv.idx = 2;
v = &m_src_vertices[m_src_vertices.size() - 1];
x1 = v->x;
y1 = v->y;
lprev = v->len;
v = &m_src_vertices[0];
x2 = v->x;
y2 = v->y;
dv.lcurr = v->len;
line_parameters prev(x1, y1, x2, y2, lprev);
v = &m_src_vertices[1];
dv.x1 = v->x;
dv.y1 = v->y;
dv.lnext = v->len;
dv.curr = line_parameters(x2, y2, dv.x1, dv.y1, dv.lcurr);
v = &m_src_vertices[dv.idx];
dv.x2 = v->x;
dv.y2 = v->y;
dv.next = line_parameters(dv.x1, dv.y1, dv.x2, dv.y2, dv.lnext);
dv.xb1 = 0;
dv.yb1 = 0;
dv.xb2 = 0;
dv.yb2 = 0;
if(m_accurate_join)
{
dv.flags = 0;
}
else
{
dv.flags =
(prev.diagonal_quadrant() == dv.curr.diagonal_quadrant()) |
((dv.curr.diagonal_quadrant() == dv.next.diagonal_quadrant()) << 1);
}
if((dv.flags & 1) == 0)
{
bisectrix(prev, dv.curr, &dv.xb1, &dv.yb1);
}
if((dv.flags & 2) == 0)
{
bisectrix(dv.curr, dv.next, &dv.xb2, &dv.yb2);
}
draw(dv, 0, m_src_vertices.size());
}
}
else
{
switch(m_src_vertices.size())
{
case 0:
case 1:
break;
case 2:
{
v = &m_src_vertices[0];
x1 = v->x;
y1 = v->y;
lprev = v->len;
v = &m_src_vertices[1];
x2 = v->x;
y2 = v->y;
line_parameters lp(x1, y1, x2, y2, lprev);
if(m_round_cap)
{
m_ren.semidot(cmp_dist_start, x1, y1, x1 + (y2 - y1), y1 - (x2 - x1));
}
m_ren.line3(lp,
x1 + (y2 - y1),
y1 - (x2 - x1),
x2 + (y2 - y1),
y2 - (x2 - x1));
if(m_round_cap)
{
m_ren.semidot(cmp_dist_end, x2, y2, x2 + (y2 - y1), y2 - (x2 - x1));
}
}
break;
case 3:
{
int x3, y3;
int lnext;
v = &m_src_vertices[0];
x1 = v->x;
y1 = v->y;
lprev = v->len;
v = &m_src_vertices[1];
x2 = v->x;
y2 = v->y;
lnext = v->len;
v = &m_src_vertices[2];
x3 = v->x;
y3 = v->y;
line_parameters lp1(x1, y1, x2, y2, lprev);
line_parameters lp2(x2, y2, x3, y3, lnext);
bisectrix(lp1, lp2, &dv.xb1, &dv.yb1);
if(m_round_cap)
{
m_ren.semidot(cmp_dist_start, x1, y1, x1 + (y2 - y1), y1 - (x2 - x1));
}
m_ren.line3(lp1,
x1 + (y2 - y1),
y1 - (x2 - x1),
dv.xb1,
dv.yb1);
m_ren.line3(lp2,
dv.xb1,
dv.yb1,
x3 + (y3 - y2),
y3 - (x3 - x2));
if(m_round_cap)
{
m_ren.semidot(cmp_dist_end, x3, y3, x3 + (y3 - y2), y3 - (x3 - x2));
}
}
break;
default:
{
dv.idx = 3;
v = &m_src_vertices[0];
x1 = v->x;
y1 = v->y;
lprev = v->len;
v = &m_src_vertices[1];
x2 = v->x;
y2 = v->y;
dv.lcurr = v->len;
line_parameters prev(x1, y1, x2, y2, lprev);
v = &m_src_vertices[2];
dv.x1 = v->x;
dv.y1 = v->y;
dv.lnext = v->len;
dv.curr = line_parameters(x2, y2, dv.x1, dv.y1, dv.lcurr);
v = &m_src_vertices[dv.idx];
dv.x2 = v->x;
dv.y2 = v->y;
dv.next = line_parameters(dv.x1, dv.y1, dv.x2, dv.y2, dv.lnext);
dv.xb1 = 0;
dv.yb1 = 0;
dv.xb2 = 0;
dv.yb2 = 0;
if(m_accurate_join)
{
dv.flags = 0;
}
else
{
dv.flags =
(prev.diagonal_quadrant() == dv.curr.diagonal_quadrant()) |
((dv.curr.diagonal_quadrant() == dv.next.diagonal_quadrant()) << 1);
}
if((dv.flags & 1) == 0)
{
bisectrix(prev, dv.curr, &dv.xb1, &dv.yb1);
m_ren.line3(prev,
x1 + (y2 - y1),
y1 - (x2 - x1),
dv.xb1,
dv.yb1);
}
else
{
m_ren.line1(prev,
x1 + (y2 - y1),
y1 - (x2 - x1));
}
if(m_round_cap)
{
m_ren.semidot(cmp_dist_start, x1, y1, x1 + (y2 - y1), y1 - (x2 - x1));
}
if((dv.flags & 2) == 0)
{
bisectrix(dv.curr, dv.next, &dv.xb2, &dv.yb2);
}
draw(dv, 1, m_src_vertices.size() - 2);
if((dv.flags & 1) == 0)
{
m_ren.line3(dv.curr,
dv.xb1,
dv.yb1,
dv.curr.x2 + (dv.curr.y2 - dv.curr.y1),
dv.curr.y2 - (dv.curr.x2 - dv.curr.x1));
}
else
{
m_ren.line2(dv.curr,
dv.curr.x2 + (dv.curr.y2 - dv.curr.y1),
dv.curr.y2 - (dv.curr.x2 - dv.curr.x1));
}
if(m_round_cap)
{
m_ren.semidot(cmp_dist_end, dv.curr.x2, dv.curr.y2,
dv.curr.x2 + (dv.curr.y2 - dv.curr.y1),
dv.curr.y2 - (dv.curr.x2 - dv.curr.x1));
}
}
break;
}
}
m_src_vertices.remove_all();
}
}
#endif
|
