1{mac_copy:agg.bmp}
2//
3// AggPas 2.4 RM3 Demo application
4// Note: Press F1 key on run to see more info about this demo
5//
6// Paths: src;src\ctrl;src\svg;src\util;src\platform\win;expat-wrap
7//
8program
9 pattern_perspective ;
10
11uses
12 Math ,SysUtils ,
13
14 agg_basics ,
15 agg_platform_support ,
16
17 agg_color ,
18 agg_pixfmt ,
19 agg_pixfmt_rgb ,
20
21 agg_ctrl ,
22 agg_rbox_ctrl ,
23
24 agg_rendering_buffer ,
25 agg_renderer_base ,
26 agg_renderer_scanline ,
27 agg_rasterizer_scanline_aa ,
28 agg_scanline ,
29 agg_scanline_u ,
30 agg_render_scanlines ,
31
32 agg_path_storage ,
33 agg_conv_transform ,
34 agg_trans_affine ,
35 agg_trans_bilinear ,
36 agg_trans_perspective ,
37 agg_span_pattern ,
38 agg_span_allocator ,
39 agg_image_filters ,
40 agg_span_interpolator_linear ,
41 agg_span_interpolator_trans ,
42 agg_span_image_filter ,
43 agg_span_pattern_filter_rgb ,
44 interactive_polygon_ ,
45 file_utils_ ;
46
47{$I agg_mode.inc }
48
49const
50 flip_y = true;
51
52var
53 g_x1 ,
54 g_y1 ,
55 g_x2 ,
56 g_y2 : double;
57
58 g_rasterizer : rasterizer_scanline_aa;
59 g_scanline   : scanline_u8;
60
61type
62 the_application = object(platform_support )
63   m_quad       : interactive_polygon;
64   m_trans_type : rbox_ctrl;
65   m_test_flag  : boolean;
66
67   constructor Construct(format_ : pix_format_e; flip_y_ : boolean );
68   destructor  Destruct;
69
70   procedure on_init; virtual;
71   procedure on_draw; virtual;
72
73   procedure on_mouse_move       (x ,y : int; flags : unsigned ); virtual;
74   procedure on_mouse_button_down(x ,y : int; flags : unsigned ); virtual;
75   procedure on_mouse_button_up  (x ,y : int; flags : unsigned ); virtual;
76
77   procedure on_key(x ,y : int; key ,flags : unsigned ); virtual;
78
79  end;
80
81{ CONSTRUCT }
82constructor the_application.Construct;
83begin
84 inherited Construct(format_ ,flip_y_ );
85
86 m_quad.Construct      (4 ,5.0 );
87 m_trans_type.Construct(460 ,5.0 ,420 + 170.0 ,60.0 ,not flip_y_ );
88
89 m_test_flag:=false;
90
91 m_trans_type.text_size_     (8 );
92 m_trans_type.text_thickness_(1 );
93
94 m_trans_type.add_item ('Affine' );
95 m_trans_type.add_item ('Bilinear' );
96 m_trans_type.add_item ('Perspective' );
97 m_trans_type.cur_item_(2 );
98
99 add_ctrl(@m_trans_type );
100
101end;
102
103{ DESTRUCT }
104destructor the_application.Destruct;
105begin
106 inherited Destruct;
107
108 m_quad.Destruct;
109 m_trans_type.Destruct;
110
111end;
112
113{ ON_INIT }
114procedure the_application.on_init;
115var
116 trans_x1 ,trans_y1 ,trans_x2 ,trans_y2 ,dx ,dy : double;
117
118begin
119 g_x1:=-150;
120 g_y1:=-150;
121 g_x2:=150;
122 g_y2:=150;
123
124 trans_x1:=-200;
125 trans_y1:=-200;
126 trans_x2:=200;
127 trans_y2:=200;
128
129 dx:=_width  / 2.0 - (trans_x2 + trans_x1 ) / 2.0;
130 dy:=_height / 2.0 - (trans_y2 + trans_y1 ) / 2.0;
131
132 m_quad.xn_ptr(0 )^:=Floor(trans_x1 + dx );
133 m_quad.yn_ptr(0 )^:=Floor(trans_y1 + dy );
134 m_quad.xn_ptr(1 )^:=Floor(trans_x2 + dx );// - 150;
135 m_quad.yn_ptr(1 )^:=Floor(trans_y1 + dy );// + 150;
136 m_quad.xn_ptr(2 )^:=Floor(trans_x2 + dx );
137 m_quad.yn_ptr(2 )^:=Floor(trans_y2 + dy );
138 m_quad.xn_ptr(3 )^:=Floor(trans_x1 + dx );
139 m_quad.yn_ptr(3 )^:=Floor(trans_y2 + dy );
140
141end;
142
143{ ON_DRAW }
144procedure the_application.on_draw;
145const
146 subdiv_shift = 2;
147
148var
149 pixf ,pixf_pre : pixel_formats;
150
151 rb ,rb_pre : renderer_base;
152
153 rgba : aggclr;
154
155 r  : renderer_scanline_aa_solid;
156 sa : span_allocator;
157 fi : image_filter_hanning;
158 sg : span_image_filter_ptr;
159 ri : renderer_scanline_aa;
160 wx ,
161 wy : wrap_mode_reflect_auto_pow2;
162
163 interpolator : span_interpolator_linear;
164 interpsubdiv : span_interpolator_linear_subdiv;
165
166 filter : image_filter;
167
168 tr  : trans_affine;
169 trb : trans_bilinear;
170 trp : trans_perspective23;
171
172begin
173 sg:=NIL;
174
175// Initialize structures
176 pixfmt_bgr24    (pixf ,rbuf_window );
177 pixfmt_bgr24_pre(pixf_pre ,rbuf_window );
178
179 rb.Construct    (@pixf );
180 rb_pre.Construct(@pixf_pre );
181
182 r.Construct(@rb );
183
184 if not m_test_flag then
185  begin
186   rgba.ConstrDbl(1 ,1 ,1 );
187   rb.clear      (@rgba );
188
189  end;
190
191 if m_trans_type._cur_item = 0 then
192  begin
193  // For the affine parallelogram transformations we
194  // calculate the 4-th (implicit) point of the parallelogram
195   m_quad.xn_ptr(3 )^:=m_quad.xn(0 ) + (m_quad.xn(2 ) - m_quad.xn(1 ) );
196   m_quad.yn_ptr(3 )^:=m_quad.yn(0 ) + (m_quad.yn(2 ) - m_quad.yn(1 ) );
197
198  end;
199
200 if not m_test_flag then
201  begin
202  // Render the "quad" tool
203   g_rasterizer.add_path(@m_quad );
204
205   rgba.ConstrDbl  (0 ,0.3 ,0.5 ,0.6 );
206   r.color_        (@rgba );
207   render_scanlines(@g_rasterizer ,@g_scanline ,@r );
208
209  // Render the controls
210   render_ctrl(@g_rasterizer ,@g_scanline ,@r ,@m_trans_type );
211
212  end;
213
214// Prepare the polygon to rasterize. Here we need to fill
215// the destination (transformed) polygon.
216 g_rasterizer.clip_box(0 ,0 ,_width ,_height );
217 g_rasterizer.reset;
218 g_rasterizer.move_to_d(m_quad.xn(0 ) ,m_quad.yn(0 ) );
219 g_rasterizer.line_to_d(m_quad.xn(1 ) ,m_quad.yn(1 ) );
220 g_rasterizer.line_to_d(m_quad.xn(2 ) ,m_quad.yn(2 ) );
221 g_rasterizer.line_to_d(m_quad.xn(3 ) ,m_quad.yn(3 ) );
222
223 sa.Construct;
224 fi.Construct;
225 filter.Construct(@fi );
226
227// Render
228 wx.Construct;
229 wy.Construct;
230
231 case m_trans_type._cur_item of
232  0 :
233   begin
234   // Note that we consruct an affine matrix that transforms
235   // a parallelogram to a rectangle, i.e., it's inverted.
236   // It's actually the same as:
237   // tr(g_x1, g_y1, g_x2, g_y2, m_triangle.polygon());
238   // tr.invert();
239    tr.Construct(parallelo_ptr(m_quad.polygon ) ,g_x1 ,g_y1 ,g_x2 ,g_y2 );
240
241   // Also note that we can use the linear interpolator instead of
242   // arbitrary span_interpolator_trans. It works much faster,
243   // but the transformations must be linear and parellel.
244    interpolator.Construct(@tr );
245
246    sg:=new(
247     span_pattern_filter_rgb_2x2_ptr ,
248     Construct(
249      @sa ,rbuf_img(0 ) ,@interpolator ,@filter ,@wx ,@wy ,bgr_order ) );
250
251    ri.Construct    (@rb_pre ,sg );
252    render_scanlines(@g_rasterizer ,@g_scanline ,@ri );
253
254   end;
255
256  1 :
257   begin
258    trb.Construct(m_quad.polygon ,g_x1 ,g_y1 ,g_x2 ,g_y2 );
259
260    if trb.is_valid then
261     begin
262      interpolator.Construct(@trb );
263
264      sg:=new(
265       span_pattern_filter_rgb_2x2_ptr ,
266       Construct(
267        @sa ,rbuf_img(0 ) ,@interpolator ,@filter ,@wx ,@wy ,bgr_order ) );
268
269      ri.Construct    (@rb_pre ,sg );
270      render_scanlines(@g_rasterizer ,@g_scanline ,@ri );
271
272     end;
273
274   end;
275
276  2 :
277   begin
278    trp.Construct(m_quad.polygon ,g_x1 ,g_y1 ,g_x2 ,g_y2 );
279
280    if trp.is_valid then
281     begin
282      interpsubdiv.Construct(@trp );
283
284      sg:=new(
285       span_pattern_filter_rgb_2x2_ptr ,
286       Construct(
287        @sa ,rbuf_img(0 ) ,@interpsubdiv ,@filter ,@wx ,@wy ,bgr_order ) );
288
289      ri.Construct    (@rb_pre ,sg );
290      render_scanlines(@g_rasterizer ,@g_scanline ,@ri );
291
292     end;
293
294   end;
295
296 end;
297
298// Free AGG resources
299 sa.Destruct;
300 filter.Destruct;
301
302 if sg <> NIL then
303  dispose(sg ,Destruct );
304
305end;
306
307{ ON_MOUSE_MOVE }
308procedure the_application.on_mouse_move;
309begin
310 if flags and mouse_left <> 0 then
311  if m_quad.on_mouse_move(x ,y ) then
312   force_redraw();
313
314 if flags and mouse_left = 0 then
315  on_mouse_button_up(x ,y ,flags );
316
317end;
318
319{ ON_MOUSE_BUTTON_DOWN }
320procedure the_application.on_mouse_button_down;
321var
322 buf : array[0..99 ] of char;
323
324begin
325 if flags and mouse_left <> 0 then
326  if m_quad.on_mouse_button_down(x ,y ) then
327   force_redraw
328  else
329   begin
330    start_timer;
331
332    m_test_flag:=true;
333
334    on_draw;
335    on_draw;
336    on_draw;
337    on_draw;
338
339    sprintf(@buf[0 ] ,'time=%.3f' ,elapsed_time );
340
341    m_test_flag:=false;
342
343    force_redraw;
344
345    message_(@buf[0 ] );
346
347   end;
348
349end;
350
351{ ON_MOUSE_BUTTON_UP }
352procedure the_application.on_mouse_button_up;
353begin
354 if m_quad.on_mouse_button_up(x ,y ) then
355  force_redraw;
356
357end;
358
359{ ON_KEY }
360procedure the_application.on_key;
361begin
362 if key = key_f1 then
363  message_(
364   'Pattern perspective transformations. Essentially it''s the same as Demo '#13 +
365   '"image_perspective", but working with a repeating pattern. Can be used '#13 +
366   'for texturing.'#13#13 +
367   'How to play with:'#13#13 +
368   'Use the left mouse button to move and distort the pattern.'#13 +
369   'Click the left mouse outside the pattern to run the performance test.' +
370   #13#13'Note: F2 key saves current "screenshot" file in this demo''s directory.  ' );
371
372end;
373
374VAR
375 app : the_application;
376 buf : array [0..255 ] of char;
377 ext : string[10 ];
378
379 img_name ,p ,n ,x : shortstring;
380
381BEGIN
382 g_x1:=0;
383 g_y1:=0;
384 g_x2:=0;
385 g_y2:=0;
386
387 g_rasterizer.Construct;
388 g_scanline.Construct;
389
390 app.Construct(pix_format_bgr24 ,flip_y );
391 app.caption_ ('AGG Example. Pattern Perspective Transformations (F1-Help)' );
392
393 img_name:='agg';
394
395{$IFDEF WIN32 }
396 if ParamCount > 0 then
397  begin
398   spread_name(ParamStr(1 ) ,p ,n ,x );
399
400   img_name:=fold_name(p ,n ,'' );
401
402  end;
403
404{$ENDIF }
405
406 if not app.load_img(0 ,img_name ) then
407  begin
408   img_name:=img_name + #0;
409   ext     :=app._img_ext + #0;
410
411   if img_name = 'spheres' then
412    begin
413     sprintf(@buf[0 ]             ,'File not found: %s' ,ptrcomp(@img_name[1 ] ) );
414     sprintf(@buf[StrLen(@buf ) ] ,'%s. Download http://www.antigrain.com/' ,ptrcomp(@ext[1 ] ) );
415     sprintf(@buf[StrLen(@buf ) ] ,'%s' ,ptrcomp(@img_name[1 ] ) );
416     sprintf(@buf[StrLen(@buf ) ] ,'%s'#13'or copy it from another directory if available.' ,ptrcomp(@ext[1 ] ) );
417
418    end
419   else
420    begin
421     sprintf(@buf[0 ]             ,'File not found: %s' ,ptrcomp(@img_name[1 ] ) );
422     sprintf(@buf[StrLen(@buf ) ] ,'%s' ,ptrcomp(@ext[1 ] ) );
423
424    end;
425
426   app.message_(@buf[0 ] );
427
428  end
429 else
430  if app.init(600 ,600 ,window_resize ) then
431   app.run;
432
433 app.Destruct;
434
435 g_rasterizer.Destruct;
436 g_scanline.Destruct;
437
438END.