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<html>
<head>
<title>
GRF_DISPLAY_OPENGL - Display a GRF Graph Using OpenGL
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
GRF_DISPLAY_OPENGL<br> Display a GRF Graph Using OpenGL
</h1>
<hr>
<p>
<b>GRF_DISPLAY_OPENGL</b>
is a C++ program which
reads a GRF file containing information about an abstract graph
and displays a plot using <b>OPENGL</b>.
</p>
<h3 align = "center">
Usage:
</h3>
<p>
<blockquote>
<b>grf_display_opengl</b> <i>prefix</i>
</blockquote>
where
<ul>
<li>
<i>prefix</i>.<b>grf</b> is the GRF file.
</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>GRF_DISPLAY_OPENGL</b> is available in
<a href = "../../cpp_src/grf_display_opengl/grf_display_opengl.html">a C++ version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<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 = "../../datasets/graffiti/graffiti.html">
GRAFFITI</a>,
a dataset directory which
contains 195 abstract graphs, with adjacency and embedding information,
stored in the GRF format.
</p>
<p>
<a href = "../../data/graph_representation/graph_representation.html">
GRAPH_REPRESENTATION</a>,
a data directory of examples of ways of representing abstract
mathematical graphs
</p>
<p>
<a href = "../../data/grf/grf.html">
GRF</a>,
a data directory which
contains a description of the GRF format and some examples.
</p>
<p>
<a href = "../../m_src/grf_display/grf_display.html">
GRF_DISPLAY</a>,
a MATLAB program which
reads a GRF file and displays a plot in the MATLAB graphics window.
</p>
<p>
<a href = "../../cpp_src/grf_io/grf_io.html">
GRF_IO</a>,
a C++ library which
reads or writes a GRF file;
</p>
<p>
<a href = "../../f_src/grf_to_eps/grf_to_eps.html">
GRF_TO_EPS</a>,
a FORTRAN90 program which
can make an encapsulated PostScript image of a GRF file.
</p>
<p>
<a href = "../../f_src/grf_to_xyl/grf_to_xyl.html">
GRF_TO_XYL</a>,
a FORTRAN90 program which
converts information describing the adjacency and embedding of an
abstract graph from GRF to XYL format.
</p>
<p>
<a href = "../../f_src/plot_points/plot_points.html">
PLOT_POINTS</a>,
a FORTRAN90 program which
reads a file of point coordinates and makes a PostScript image of them.
</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/xyl/xyl.html">
XYL</a>,
a data directory which
contains some examples of the XYL format for 2D points and lines.
</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/xyf_display_opengl/xyf_display_opengl.html">
XYF_DISPLAY_OPENGL</a>,
a C++ program which
reads XYF information defining points and faces in 2D,
and displays an image 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>
<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>
Fourth Edition,<br>
Addison-Wesley, 2004,<br>
ISBN: 032117383X,<br>
LC: T385.O642
</li>
<li>
Mason Woo, Jackie Neider, Tom Davis,<br>
OpenGL Programming Guide,<br>
Addison-Wesley, 1997,<br>
ISBN: 0-201-46138-2,<br>
LC: T385.N435
</li>
<li>
Richard Wright, Michael Sweet,<br>
OpenGL Superbible,<br>
Third Edition,<br>
Sams, 2004,<br>
ISBN: 0672326019,<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 = "grf_display_opengl.cpp">
grf_display_opengl.cpp</a>, the source code.
</li>
<li>
<a href = "grf_display_opengl.sh">grf_display_opengl.sh</a>,
commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<b>COXETER</b> is the Coxeter graph.
<ul>
<li>
<a href = "coxeter.grf">coxeter.grf</a>,
is a GRF file defining the Coxeter graph.
</li>
<li>
<a href = "coxeter.png">coxeter.png</a>,
a PNG image of the plot.
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>MAIN</b> is the main program for GRF_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>GRF_DATA_PRINT</b> prints the data of a GRF file.
</li>
<li>
<b>GRF_DATA_READ</b> reads the data of a GRF file.
</li>
<li>
<b>GRF_HEADER_PRINT</b> prints the header of a GRF file.
</li>
<li>
<b>GRF_HEADER_READ</b> reads the header of a GRF file.
</li>
<li>
<b>I4VEC_MAX</b> returns the value of the maximum element in an I4VEC.
</li>
<li>
<b>I4VEC_MIN</b> returns the value of the minimum element in an I4VEC.
</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.
</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>S_CAT</b> concatenates two strings to make a third string.
</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>
<li>
<b>XYL_DATA_PRINT</b> prints the data of an XYL file.
</li>
<li>
<b>XYL_HEADER_PRINT</b> prints the header of an XYL file.
</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 13 January 2009.
</i>
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