forked from johannesgerer/jburkardt-cpp
-
Notifications
You must be signed in to change notification settings - Fork 0
/
triangulation_display_opengl.html
494 lines (437 loc) · 13.9 KB
/
triangulation_display_opengl.html
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
<html>
<head>
<title>
TRIANGULATION_DISPLAY_OPENGL - Display a Triangulation Using OpenGL
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
TRIANGULATION_DISPLAY_OPENGL<br> Display a Triangulation Using OpenGL
</h1>
<hr>
<p>
<b>TRIANGULATION_DISPLAY_OPENGL</b>
is a C++ program which
reads the name of two data files
defining a triangulation, reads the data,
and displays the triangulation using <b>OpenGL</b>.
</p>
<p>
The files defining the triangulation consist of one file containing
the coordinates of the points, and a second file that lists the
indices of the nodes making up each triangle. Either 3-node or
6-node triangles may be used.
</p>
<h3 align = "center">
Usage:
</h3>
<p>
<blockquote>
<b>triangulation_display_opengl</b> <i>prefix</i>
</blockquote>
where <i>prefix</i> is the common filename prefix:
<ul>
<li>
<i>prefix</i>_nodes.txt contains the node coordinates,
</li>
<li>
<i>prefix</i>_elements.txt contains the element definitions.
</li>
</ul>
</p>
<h3 align = "center">
Licensing:
</h3>
<p>
The computer code and data files described and made available on this web page
are distributed under
<a href = "../../txt/gnu_lgpl.txt">the GNU LGPL license.</a>
</p>
<h3 align = "center">
Languages:
</h3>
<p>
<b>TRIANGULATION_DISPLAY_OPENGL</b> is available in
<a href = "../../cpp_src/triangulation_display_opengl/triangulation_display_opengl.html">a C++ version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../cpp_src/caustic_opengl/caustic_opengl.html">
CAUSTIC_OPENGL</a>,
a C++ program which
computes a caustic curve and displays it using OpenGL.
</p>
<p>
<a href = "../../m_src/fem_basis_t3_display/fem_basis_t3_display.html">
FEM_BASIS_T3_DISPLAY</a>,
a MATLAB program which
displays a basis function associated with a linear triangle ("T3") mesh.
</p>
<p>
<a href = "../../m_src/fem_basis_t6_display/fem_basis_t6_display.html">
FEM_BASIS_T6_DISPLAY</a>,
a MATLAB program which
reads a quadratic triangle mesh and displays any associated basis function.
</p>
<p>
<a href = "../../cpp_src/fern_opengl/fern_opengl.html">
FERN_OPENGL</a>,
a C++ program which
uses OpenGL to display the Barnsley fractal fern.
</p>
<p>
<a href = "../../c_src/flood_opengl/flood_opengl.html">
FLOOD_OPENGL</a>,
a C program which
allows a user to select a region and flood it with color,
using OpenGL, by Art Wetzel.
</p>
<p>
<a href = "../../c_src/life_opengl/life_opengl.html">
LIFE_OPENGL</a>,
a C program which
simulates a version of John Conway's "Game of Life", displaying the
results using OpenGL.
</p>
<p>
<a href = "../../cpp_src/lights_out_opengl/lights_out_opengl.html">
LIGHTS_OUT_OPENGL</a>,
a C++ program which
sets up a "Lights Out" game and allows the user to solve it,
using the OpenGL graphics window.
</p>
<p>
<a href = "../../cpp_src/lissajous_opengl/lissajous_opengl.html">
LISSAJOUS_OPENGL</a>,
a C++ program which
computes a Lissajous figure and displays it using OpenGL.
</p>
<p>
<a href = "../../cpp_src/mesh_display_opengl/mesh_display_opengl.html">
MESH_DISPLAY_OPENGL</a>,
a C++ program which
reads data defining a polygonal mesh and displays it using OpenGL.
</p>
<p>
<a href = "../../cpp_src/opengl/opengl.html">
OPENGL</a>,
C++ programs which
illustrate the use of the OpenGL graphics library;
</p>
<p>
<a href = "../../cpp_src/polygonal_surface_display_opengl/polygonal_surface_display_opengl.html">
POLYGONAL_SURFACE_DISPLAY_OPENGL</a>,
a C++ program which
displays a surface in 3D described as a set of polygons, using OpenGL.
</p>
<p>
<a href = "../../cpp_src/rotating_cube_display_opengl/rotating_cube_display_opengl.html">
ROTATING_CUBE_DISPLAY_OPENGL</a>,
a C++ program which
displays a rotating color cube in 3D, using OpenGL;
</p>
<p>
<a href = "../../cpp_src/sphere_xyz_display_opengl/sphere_xyz_display_opengl.html">
SPHERE_XYZ_DISPLAY_OPENGL</a>,
a C++ program which
reads XYZ information defining points in 3D,
and displays a unit sphere and the points, using OpenGL.
</p>
<p>
<a href = "../../data/table/table.html">
TABLE</a>,
a format which
is used for the input files to
<b>TRIANGULATION_DISPLAY_OPENGL</b>.
</p>
<p>
<a href = "../../cpp_src/table_delaunay/table_delaunay.html">
TABLE_DELAUNAY</a>,
a C++ program which
computes the Delaunay triangulation of a set of points.
</p>
<p>
<a href = "../../cpp_src/table_io/table_io.html">
TABLE_IO</a>,
a C++ library which
supplies the routines used to read the TABLE file.
</p>
<p>
<a href = "../../cpp_src/table_voronoi/table_voronoi.html">
TABLE_VORONOI</a>,
a C++ program which
computes information about the Voronoi diagram of the points.
</p>
<p>
<a href = "../../m_src/triangulation_display/triangulation_display.html">
TRIANGULATION_DISPLAY</a>,
a MATLAB program which
displays the nodes and elements of a triangulation on the MATLAB graphics screen;
</p>
<p>
<a href = "../../cpp_src/triangulation_histogram/triangulation_histogram.html">
TRIANGULATION_HISTOGRAM</a>,
a C++ program which
computes histograms of data over a triangulation.
</p>
<p>
<a href = "../../cpp_src/triangulation_mask/triangulation_mask.html">
TRIANGULATION_MASK</a>,
a C++ program which
takes an existing triangulation and deletes triangles and
their corresponding nodes as requested by the user.
</p>
<p>
<a href = "../../cpp_src/triangulation_node_to_element/triangulation_node_to_element.html">
TRIANGULATION_NODE_TO_ELEMENT</a>,
a C++ program which
reads files describing a set of nodes, their triangulation, and the
value of one or more quantities at each node, and outputs a file
that averages the quantities for each element. This operation
in effect creates an "order1" finite element model of the data.
</p>
<p>
<a href = "../../data/triangulation_order3/triangulation_order3.html">
TRIANGULATION_ORDER3</a>,
a data directory which
contains a description and
examples of order 3 triangulations.
</p>
<p>
<a href = "../../data/triangulation_order6/triangulation_order6.html">
TRIANGULATION_ORDER6</a>,
a data directory which
contains a description and
examples of order 6 triangulations.
</p>
<p>
<a href = "../../cpp_src/triangulation_plot/triangulation_plot.html">
TRIANGULATION_PLOT</a>,
a C++ program which
reads data defining a triangulation and creates a
PostScript image of the nodes and triangles.
</p>
<p>
<a href = "../../cpp_src/triangulation_quad/triangulation_quad.html">
TRIANGULATION_QUAD</a>,
a C++ program which
estimates the integral of a function over a triangulated region.
</p>
<p>
<a href = "../../cpp_src/xy_display_opengl/xy_display_opengl.html">
XY_DISPLAY_OPENGL</a>,
a C++ program which
reads an XY file of 2D point coordinates, and displays
an image of those points using OpenGL.
</p>
<p>
<a href = "../../cpp_src/xyl_display_opengl/xyl_display_opengl.html">
XYL_DISPLAY_OPENGL</a>,
a C++ program which
reads XYL information defining points and lines in 2D, and displays
an image using OpenGL.
</p>
<p>
<a href = "../../cpp_src/xyz_display_opengl/xyz_display_opengl.html">
XYZ_DISPLAY_OPENGL</a>,
a C++ program which
reads an XYZ file of 3D point coordinates, and displays
an image of those points using OpenGL.
</p>
<h3 align = "center">
Reference:
</h3>
<p>
<ol>
<li>
Edward Angel,<br>
Interactive Computer Graphics,
a Top-Down Approach with OpenGL,<br>
Addison-Wesley, 2000,<br>
ISBN: 0-201-38597-X,<br>
LC: T385.A514.
</li>
<li>
Renate Kempf, Chris Frazier, editors,<br>
OpenGL Reference Manual,<br>
Addison-Wesley, 1997,<br>
LC: T385.O642.
</li>
<li>
Mason Woo, Jackie Neider, Tom Davis,<br>
OpenGL Programming Guide,<br>
Addison-Wesley, 1997,<br>
LC: T385.N435.
</li>
<li>
Richard Wright, Michael Sweet,<br>
OpenGL Superbible,<br>
Waite Group Press, 1996,<br>
LC: T385.W73.
</li>
<li>
<a href = "http://www.opengl.org/">
http://www.opengl.org/ </a> <br>
The official OpenGL site.
</li>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "triangulation_display_opengl.cpp">
triangulation_display_opengl.cpp</a>, the source code.
</li>
<li>
<a href = "triangulation_display_opengl.sh">
triangulation_display_opengl.sh</a>,
commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<b>ELL3</b> is an L-shaped region, which may be triangulated by
order-3 triangles.
<ul>
<li>
<a href = "ell3_output.txt">ell3_output.txt</a>,
the printed output in response to the command:<pre><b>
triangulation_display_opengl ell_nodes.txt ell_tri3.txt</b></pre>
</li>
<li>
<a href = "ell3_nodes.txt">
ell3_nodes.txt</a>, 21 nodes in an L-shaped region.
</li>
<li>
<a href = "ell3_elements.txt">
ell3_elements.txt</a>, an order-3 triangulation of the nodes.
</li>
<li>
<a href = "ell3.png">
ell3.png</a>,
a <a href = "../../data/png/png.html">PNG</a> image of the
triangulation.
</li>
</ul>
</p>
<p>
<b>ELL6</b> is an L-shaped region, which may be triangulated by
order-6 triangles.
<ul>
<li>
<a href = "ell6_output.txt">ell6_output.txt</a>,
the printed output in response to the command:<pre><b>
triangulation_display_opengl ell_nodes.txt ell_tri6.txt</b></pre>
</li>
<li>
<a href = "ell6_nodes.txt">
ell6_nodes.txt</a>, 21 nodes in an L-shaped region.
</li>
<li>
<a href = "ell6_elements.txt">
ell6_elements.txt</a>, an order-6 triangulation of the nodes.
</li>
<li>
<a href = "ell6.png">
ell6.png</a>,
a <a href = "../../data/png/png.html">PNG</a> image of the
triangulation.
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>MAIN</b> is the main program for TRIANGULATION_DISPLAY_OPENGL.
</li>
<li>
<b>CH_EQI</b> is true if two characters are equal, disregarding case.
</li>
<li>
<b>CH_TO_DIGIT</b> returns the integer value of a base 10 digit.
</li>
<li>
<b>DISPLAY</b> generates the graphics output.
</li>
<li>
<b>FILE_COLUMN_COUNT</b> counts the number of columns in the first line of a file.
</li>
<li>
<b>FILE_ROW_COUNT</b> counts the number of row records in a file.
</li>
<li>
<b>I4_MAX</b> returns the maximum of two I4's.
</li>
<li>
<b>I4_MIN</b> returns the smaller of two I4's.
</li>
<li>
<b>I4MAT_DATA_READ</b> reads data from an I4MAT file.
</li>
<li>
<b>I4MAT_HEADER_READ</b> reads the header from an I4MAT file.
</li>
<li>
<b>MYINIT</b> initializes OpenGL state variables dealing with viewing and attributes.
</li>
<li>
<b>R8_MAX</b> returns the maximum of two R8's.
</li>
<li>
<b>R82VEC_MAX</b> returns the maximum value in a R82VEC.
</li>
<li>
<b>R82VEC_MIN</b> returns the minimum value in a R82VEC.
</li>
<li>
<b>R8MAT_DATA_READ</b> reads the data from an R8MAT file.
</li>
<li>
<b>R8MAT_HEADER_READ</b> reads the header from an R8MAT file.
</li>
<li>
<b>S_LEN_TRIM</b> returns the length of a string to the last nonblank.
</li>
<li>
<b>S_TO_I4</b> reads an I4 from a string.
</li>
<li>
<b>S_TO_I4VEC</b> reads an I4VEC from a string.
</li>
<li>
<b>S_TO_R8</b> reads an R8 from a string.
</li>
<li>
<b>S_TO_R8VEC</b> reads an R8VEC from a string.
</li>
<li>
<b>S_WORD_COUNT</b> counts the number of "words" in a string.
</li>
<li>
<b>TIMESTAMP</b> prints the current YMDHMS date as a time stamp.
</li>
</ul>
</p>
<p>
You can go up one level to <a href = "../cpp_src.html">
the C++ source codes</a>.
</p>
<hr>
<i>
Last revised on 03 October 2009.
</i>
<!-- John Burkardt -->
</body>
<!-- Initial HTML skeleton created by HTMLINDEX. -->
</html>