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
|
//
// AggPas 2.4 RM3 Demo application
// Note: Press F1 key on run to see more info about this demo
//
// Paths: src;src\ctrl;src\svg;src\util;src\platform\win;expat-wrap
//
program
conv_contour_ ;
uses
agg_basics ,
agg_platform_support ,
agg_color ,
agg_pixfmt ,
agg_pixfmt_rgb ,
agg_ctrl ,
agg_rbox_ctrl ,
agg_cbox_ctrl ,
agg_slider_ctrl ,
agg_rendering_buffer ,
agg_renderer_base ,
agg_renderer_scanline ,
agg_rasterizer_scanline_aa ,
agg_scanline_p ,
agg_render_scanlines ,
agg_conv_stroke ,
agg_conv_transform ,
agg_conv_curve ,
agg_conv_contour ,
agg_path_storage ,
agg_trans_affine ,
agg_math_stroke ;
{$I agg_mode.inc }
const
flip_y = true;
type
the_application = object(platform_support )
m_close : rbox_ctrl;
m_width : slider_ctrl;
m_auto_detect : cbox_ctrl;
m_path : path_storage;
constructor Construct(format_ : pix_format_e; flip_y_ : boolean );
destructor Destruct;
procedure compose_path;
procedure on_draw; virtual;
procedure on_key(x ,y : int; key ,flags : unsigned ); virtual;
end;
{ CONSTRUCT }
constructor the_application.Construct;
begin
inherited Construct(format_ ,flip_y_ );
m_close.Construct (10.0 ,10.0 ,130.0 ,80.0 ,not flip_y_ );
m_width.Construct (130 + 10.0 ,10.0 + 4.0 ,130 + 300.0 ,10.0 + 8.0 + 4.0 ,not flip_y_ );
m_auto_detect.Construct(130 + 10.0 ,10.0 + 4.0 + 16.0 ,'Autodetect orientation if not defined' ,not flip_y_ );
m_path.Construct;
add_ctrl(@m_close );
m_close.add_item ('Close' );
m_close.add_item ('Close CW' );
m_close.add_item ('Close CCW' );
m_close.cur_item_(0 );
add_ctrl(@m_width );
m_width.range_(-100.0 ,100.0 );
m_width.value_(0.0 );
m_width.label_('Width=%1.2f' );
add_ctrl(@m_auto_detect );
end;
{ DESTRUCT }
destructor the_application.Destruct;
begin
inherited Destruct;
m_close.Destruct;
m_width.Destruct;
m_auto_detect.Destruct;
m_path.Destruct;
end;
{ COMPOSE_PATH }
procedure the_application.compose_path;
var
flag : unsigned;
begin
flag:=0;
if m_close._cur_item = 1 then
flag:=path_flags_cw;
if m_close._cur_item = 2 then
flag:=path_flags_ccw;
m_path.remove_all;
m_path.move_to(28.47 ,6.45 );
m_path.curve3 (21.58 ,1.12 ,19.82 ,0.29 );
m_path.curve3 (17.19 ,-0.93 ,14.21 ,-0.93 );
m_path.curve3 (9.57 ,-0.93 ,6.57 ,2.25 );
m_path.curve3 (3.56 ,5.42 ,3.56 ,10.60 );
m_path.curve3 (3.56 ,13.87 ,5.03 ,16.26 );
m_path.curve3 (7.03 ,19.58 ,11.99 ,22.51 );
m_path.curve3 (16.94 ,25.44 ,28.47 ,29.64 );
m_path.line_to(28.47 ,31.40 );
m_path.curve3 (28.47 ,38.09 ,26.34 ,40.58 );
m_path.curve3 (24.22 ,43.07 ,20.17 ,43.07 );
m_path.curve3 (17.09 ,43.07 ,15.28 ,41.41 );
m_path.curve3 (13.43 ,39.75 ,13.43 ,37.60 );
m_path.line_to(13.53 ,34.77 );
m_path.curve3 (13.53 ,32.52 ,12.38 ,31.30 );
m_path.curve3 (11.23 ,30.08 ,9.38 ,30.08 );
m_path.curve3 (7.57 ,30.08 ,6.42 ,31.35 );
m_path.curve3 (5.27 ,32.62 ,5.27 ,34.81 );
m_path.curve3 (5.27 ,39.01 ,9.57 ,42.53 );
m_path.curve3 (13.87 ,46.04 ,21.63 ,46.04 );
m_path.curve3 (27.59 ,46.04 ,31.40 ,44.04 );
m_path.curve3 (34.28 ,42.53 ,35.64 ,39.31 );
m_path.curve3 (36.52 ,37.21 ,36.52 ,30.71 );
m_path.line_to(36.52 ,15.53 );
m_path.curve3 (36.52 ,9.13 ,36.77 ,7.69 );
m_path.curve3 (37.01 ,6.25 ,37.57 ,5.76 );
m_path.curve3 (38.13 ,5.27 ,38.87 ,5.27 );
m_path.curve3 (39.65 ,5.27 ,40.23 ,5.62 );
m_path.curve3 (41.26 ,6.25 ,44.19 ,9.18 );
m_path.line_to(44.19 ,6.45 );
m_path.curve3 (38.72 ,-0.88 ,33.74 ,-0.88 );
m_path.curve3 (31.35 ,-0.88 ,29.93 ,0.78 );
m_path.curve3 (28.52 ,2.44 ,28.47 ,6.45 );
m_path.close_polygon(flag );
m_path.move_to(28.47 ,9.62 );
m_path.line_to(28.47 ,26.66 );
m_path.curve3 (21.09 ,23.73 ,18.95 ,22.51 );
m_path.curve3 (15.09 ,20.36 ,13.43 ,18.02 );
m_path.curve3 (11.77 ,15.67 ,11.77 ,12.89 );
m_path.curve3 (11.77 ,9.38 ,13.87 ,7.06 );
m_path.curve3 (15.97 ,4.74 ,18.70 ,4.74 );
m_path.curve3 (22.41 ,4.74 ,28.47 ,9.62 );
m_path.close_polygon(flag );
end;
{ ON_DRAW }
procedure the_application.on_draw;
var
pixf : pixel_formats;
renb : renderer_base;
ren : renderer_scanline_aa_solid;
rgba : aggclr;
ras : rasterizer_scanline_aa;
sl : scanline_p8;
mtx : trans_affine;
tas : trans_affine_scaling;
tat : trans_affine_translation;
trans : conv_transform;
curve : conv_curve;
contour : conv_contour;
begin
// Initialize structures
pixfmt_bgr24(pixf ,rbuf_window );
renb.Construct(@pixf );
ren.Construct (@renb );
rgba.ConstrDbl(1 ,1 ,1 );
renb.clear (@rgba );
ras.Construct;
sl.Construct;
// Render
mtx.Construct;
tas.Construct(4.0 );
mtx.multiply (@tas );
tat.Construct(150 ,100 );
mtx.multiply (@tat );
trans.Construct(@m_path ,@mtx );
curve.Construct(@trans );
contour.Construct(@curve );
contour.width_ (m_width._value );
//contour.line_join_ (miter_join );
//contour.inner_join_ (miter_join );
//contour.inner_miter_limit_ (4.0 );
contour.auto_detect_orientation_(m_auto_detect._status );
compose_path;
ras.add_path(@contour );
rgba.ConstrDbl(0 ,0 ,0 );
ren.color_ (@rgba );
render_scanlines(@ras ,@sl ,@ren );
// Render the controls
render_ctrl(@ras ,@sl ,@ren ,@m_close );
render_ctrl(@ras ,@sl ,@ren ,@m_width );
render_ctrl(@ras ,@sl ,@ren ,@m_auto_detect );
// Free AGG resources
ras.Destruct;
sl.Destruct;
curve.Destruct;
contour.Destruct;
end;
{ ON_KEY }
procedure the_application.on_key;
begin
if key = key_f1 then
message_(
'One of the converters in AGG is conv_contour. It allows you to extend or shrink '#13 +
'polygons. Initially, it was implemented to eliminate the "problem of adjacent edges"'#13 +
'in the SVG Viewer, but it can be very useful in many other applications, for example,'#13 +
'to change the font weight on the fly. The trick here is that the sign (dilation or '#13 +
'shrinking) depends on the vertex order - clockwise or counterclockwise. '#13 +
'In the conv_contour you can control the behavior. Sometimes you need to preserve '#13 +
'the dilation regardless of the initial orientation, sometimes it should depend '#13 +
'on the orientation. The glyph a has a "hole" whose orientation differs from '#13 +
'the main contour. To change the "weight" correctly, you need to keep the orientation '#13 +
'as it is originally defined. If you turn "Autodetect orientation" on, the glyph will '#13 +
'be extended or shrinked incorrectly.'#13#13 +
'How to play with:'#13#13 +
'The radio buttons control the orientation flad assigned to all polygons.'#13 +
'"Close" doesn''t add the flag.'#13 +
'"Close CW" and "Close CCW" add "clockwise" or "counterclockwise" flag respectively.' +
#13#13'Note: F2 key saves current "screenshot" file in this demo''s directory. ' );
end;
VAR
app : the_application;
BEGIN
app.Construct(pix_format_bgr24 ,flip_y );
app.caption_ ('AGG Example. Contour Tool & Polygon Orientation (F1-Help)' );
if app.init(440 ,330 ,0 ) then
app.run;
app.Destruct;
END.
|
