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
|
#include <stdlib.h>
#include <ctype.h>
#include <stdio.h>
#include "agg_basics.h"
#include "agg_rendering_buffer.h"
#include "agg_rasterizer_scanline_aa.h"
#include "agg_scanline_p.h"
#include "agg_renderer_scanline.h"
#include "agg_path_storage.h"
#include "agg_conv_transform.h"
#include "agg_conv_clip_polygon.h"
#include "agg_bounding_rect.h"
#include "agg_ellipse.h"
#include "agg_trans_bilinear.h"
#include "agg_trans_perspective.h"
#include "ctrl/agg_rbox_ctrl.h"
#include "platform/agg_platform_support.h"
#include "interactive_polygon.h"
#define AGG_BGR24
//#define AGG_RGB24
//#define AGG_BGRA32
//#define AGG_RGBA32
//#define AGG_ARGB32
//#define AGG_ABGR32
//#define AGG_RGB565
//#define AGG_RGB555
#include "pixel_formats.h"
enum flip_y_e { flip_y = true };
agg::rasterizer_scanline_aa<> g_rasterizer;
agg::scanline_p8 g_scanline;
agg::path_storage g_path;
agg::rgba8 g_colors[100];
unsigned g_path_idx[100];
unsigned g_npaths = 0;
double g_x1 = 0;
double g_y1 = 0;
double g_x2 = 0;
double g_y2 = 0;
double g_base_dx = 0;
double g_base_dy = 0;
double g_angle = 0;
double g_scale = 1.0;
double g_skew_x = 0;
double g_skew_y = 0;
int g_nclick = 0;
unsigned parse_lion(agg::path_storage& ps, agg::rgba8* colors, unsigned* path_idx);
void parse_lion()
{
g_npaths = parse_lion(g_path, g_colors, g_path_idx);
agg::pod_array_adaptor<unsigned> path_idx(g_path_idx, 100);
agg::bounding_rect(g_path, path_idx, 0, g_npaths, &g_x1, &g_y1, &g_x2, &g_y2);
g_base_dx = (g_x2 - g_x1) / 2.0;
g_base_dy = (g_y2 - g_y1) / 2.0;
g_path.flip_x(g_x1, g_x2);
g_path.flip_y(g_y1, g_y2);
}
namespace agg
{
}
class the_application : public agg::platform_support
{
public:
typedef agg::renderer_base<pixfmt> renderer_base;
typedef agg::renderer_scanline_aa_solid<renderer_base> renderer_solid;
agg::interactive_polygon m_quad;
agg::rbox_ctrl<agg::rgba8> m_trans_type;
the_application(agg::pix_format_e format, bool flip_y) :
agg::platform_support(format, flip_y),
m_quad(4, 5.0),
m_trans_type(420, 5.0, 420+130.0, 55.0, !flip_y)
{
parse_lion();
m_quad.xn(0) = g_x1;
m_quad.yn(0) = g_y1;
m_quad.xn(1) = g_x2;
m_quad.yn(1) = g_y1;
m_quad.xn(2) = g_x2;
m_quad.yn(2) = g_y2;
m_quad.xn(3) = g_x1;
m_quad.yn(3) = g_y2;
m_trans_type.add_item("Bilinear");
m_trans_type.add_item("Perspective");
m_trans_type.cur_item(0);
add_ctrl(m_trans_type);
}
virtual void on_init()
{
double dx = width() / 2.0 - (m_quad.xn(1) - m_quad.xn(0)) / 2.0;
double dy = height() / 2.0 - (m_quad.yn(2) - m_quad.yn(0)) / 2.0;
m_quad.xn(0) += dx;
m_quad.yn(0) += dy;
m_quad.xn(1) += dx;
m_quad.yn(1) += dy;
m_quad.xn(2) += dx;
m_quad.yn(2) += dy;
m_quad.xn(3) += dx;
m_quad.yn(3) += dy;
}
virtual void on_draw()
{
pixfmt pixf(rbuf_window());
renderer_base rb(pixf);
renderer_solid r(rb);
rb.clear(agg::rgba(1, 1, 1));
g_rasterizer.clip_box(0, 0, width(), height());
if(m_trans_type.cur_item() == 0)
{
agg::trans_bilinear tr(g_x1, g_y1, g_x2, g_y2, m_quad.polygon());
if(tr.is_valid())
{
//--------------------------
// Render transformed lion
//
agg::conv_transform<agg::path_storage,
agg::trans_bilinear> trans(g_path, tr);
agg::render_all_paths(g_rasterizer, g_scanline, r, trans, g_colors, g_path_idx, g_npaths);
//--------------------------
//--------------------------
// Render transformed ellipse
//
agg::ellipse ell((g_x1 + g_x2) * 0.5, (g_y1 + g_y2) * 0.5,
(g_x2 - g_x1) * 0.5, (g_y2 - g_y1) * 0.5,
200);
agg::conv_stroke<agg::ellipse> ell_stroke(ell);
ell_stroke.width(3.0);
agg::conv_transform<agg::ellipse,
agg::trans_bilinear> trans_ell(ell, tr);
agg::conv_transform<agg::conv_stroke<agg::ellipse>,
agg::trans_bilinear> trans_ell_stroke(ell_stroke, tr);
g_rasterizer.add_path(trans_ell);
r.color(agg::rgba(0.5, 0.3, 0.0, 0.3));
agg::render_scanlines(g_rasterizer, g_scanline, r);
g_rasterizer.add_path(trans_ell_stroke);
r.color(agg::rgba(0.0, 0.3, 0.2, 1.0));
agg::render_scanlines(g_rasterizer, g_scanline, r);
//--------------------------
}
}
else
{
agg::trans_perspective tr(g_x1, g_y1, g_x2, g_y2, m_quad.polygon());
if(tr.is_valid())
{
//--------------------------
// Render transformed lion
//
agg::conv_transform<agg::path_storage,
agg::trans_perspective> trans(g_path, tr);
agg::render_all_paths(g_rasterizer, g_scanline, r, trans, g_colors, g_path_idx, g_npaths);
//--------------------------
//--------------------------
// Render transformed ellipse
//
agg::ellipse ell((g_x1 + g_x2) * 0.5, (g_y1 + g_y2) * 0.5,
(g_x2 - g_x1) * 0.5, (g_y2 - g_y1) * 0.5,
200);
agg::conv_stroke<agg::ellipse> ell_stroke(ell);
ell_stroke.width(3.0);
agg::conv_transform<agg::ellipse,
agg::trans_perspective> trans_ell(ell, tr);
agg::conv_transform<agg::conv_stroke<agg::ellipse>,
agg::trans_perspective> trans_ell_stroke(ell_stroke, tr);
g_rasterizer.add_path(trans_ell);
r.color(agg::rgba(0.5, 0.3, 0.0, 0.3));
agg::render_scanlines(g_rasterizer, g_scanline, r);
g_rasterizer.add_path(trans_ell_stroke);
r.color(agg::rgba(0.0, 0.3, 0.2, 1.0));
agg::render_scanlines(g_rasterizer, g_scanline, r);
//--------------------------
// Testing the reverse transformations
//agg::trans_perspective tr2(m_quad.polygon(), g_x1, g_y1, g_x2, g_y2);
//if(tr2.is_valid())
//{
// double x, y;
// x = m_quad.xn(0); y = m_quad.yn(0); tr2.transform(&x, &y);
// g_rasterizer.move_to_d(x, y);
// x = m_quad.xn(1); y = m_quad.yn(1); tr2.transform(&x, &y);
// g_rasterizer.line_to_d(x, y);
// x = m_quad.xn(2); y = m_quad.yn(2); tr2.transform(&x, &y);
// g_rasterizer.line_to_d(x, y);
// x = m_quad.xn(3); y = m_quad.yn(3); tr2.transform(&x, &y);
// g_rasterizer.line_to_d(x, y);
// r.color(agg::rgba(0.5, 0.0, 0.0, 0.5));
// agg::render_scanlines(g_rasterizer, g_scanline, r);
//}
//else
//{
// message("Singularity...");
//}
}
}
//--------------------------
// Render the "quad" tool and controls
g_rasterizer.add_path(m_quad);
r.color(agg::rgba(0, 0.3, 0.5, 0.6));
agg::render_scanlines(g_rasterizer, g_scanline, r);
agg::render_ctrl(g_rasterizer, g_scanline, rb, m_trans_type);
//--------------------------
}
virtual void on_mouse_button_down(int x, int y, unsigned flags)
{
if(flags & agg::mouse_left)
{
if(m_quad.on_mouse_button_down(x, y))
{
force_redraw();
}
}
}
virtual void on_mouse_move(int x, int y, unsigned flags)
{
if(flags & agg::mouse_left)
{
if(m_quad.on_mouse_move(x, y))
{
force_redraw();
}
}
if((flags & agg::mouse_left) == 0)
{
on_mouse_button_up(x, y, flags);
}
}
virtual void on_mouse_button_up(int x, int y, unsigned flags)
{
if(m_quad.on_mouse_button_up(x, y))
{
force_redraw();
}
}
};
int agg_main(int argc, char* argv[])
{
the_application app(pix_format, flip_y);
app.caption("AGG Example. Perspective Transformations");
if(app.init(600, 600, agg::window_resize))
{
return app.run();
}
return 1;
}
|
