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<html>
<head>
<title>
XYZF_DISPLAY_OPENGL - Display 3D Points and Faces Using OpenGL
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
XYZF_DISPLAY_OPENGL<br> Display 3D Points and Faces Using OpenGL
</h1>
<hr>
<p>
<b>XYZF_DISPLAY_OPENGL</b>
is a C++ program which
reads XYZF information defining 3D points and faces,
and displays an image using <b>OPENGL</b>.
</p>
<p>
The program displays the data, and slowly rotates it.
</p>
<p>
SXYZ_VORONOI, which computes the Voronoi diagram for a set of points
on a sphere, is an example of the programs whose output can be displayed
by <b>XYZF_DISPLAY_OPENGL</b>.
</p>
<h3 align = "center">
Usage:
</h3>
<p>
<blockquote>
<b>xyzf_display_opengl</b> <i>prefix</i>
</blockquote>
where
<ul>
<dt>
<i>prefix</i> is the common file prefix,
</li>
</ul>
reads the XYZ coordinate data in <i>prefix.xyz</i> and
the face information in <i>prefix.xyzf</i>, and displays a plot of the points
and faces. The image will slowly rotate. Successive mouse clicks alternate the
axis of rotation from the X, to the Y, to the Z axis and back again.
</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>XYZF_DISPLAY_OPENGL</b> is available in
<a href = "../../cpp_src/xyzf_display_opengl/xyzf_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 = "../../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 = "../../f_src/sphere_voronoi/sphere_voronoi.html">
SPHERE_VORONOI</a>,
a FORTRAN90 library which
reads an XYZ file of 3D points on the unit sphere, and
computes and plots Delaunay triangulations and Voronoi diagrams.
</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 = "../../cpp_src/triangulation_display_opengl/triangulation_display_opengl.html">
TRIANGULATION_DISPLAY_OPENGL</a>,
a C++ program which
reads files defining a triangulation and displays an image
using Open GL.
</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 = "../../data/xyz/xyz.html">
XYZ</a>,
a data directory which
contains some examples of 3D pointsets.
</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>
<p>
<a href = "../../data/xyzf/xyzf.html">
XYZF</a>,
a data directory which
contains some examples of sets of 3D points and faces.
</p>
<p>
<a href = "../../data/xyzl/xyzl.html">
XYZL</a>,
a data directory which
contains some examples of sets of 3D points and lines.
</p>
<p>
<a href = "../../cpp_src/xyzl_display_opengl/xyzl_display_opengl.html">
XYZL_DISPLAY_OPENGL</a>,
a C++ program which
reads XYZL information defining points and lines in 3D, and displays
an image in a MATLAB graphics window.
</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 = "xyzf_display_opengl.cpp">
xyzf_display_opengl.cpp</a>, the source code.
</li>
<li>
<a href = "xyzf_display_opengl.sh">xyzf_display_opengl.sh</a>,
commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<ul>
<li>
<a href = "sphere.xyz">
sphere.xyz</a>, the vertices of a Voronoi diagram on the unit sphere.
</li>
<li>
<a href = "sphere.xyzf">
sphere.xyzf</a>, the vertices that must be joined to make the faces.
</li>
<li>
<a href = "sphere.png">sphere.png</a>,
a PNG image of
the screen generated by Open GL.
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>MAIN</b> is the main program for XYZF_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>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>MOUSE</b> determines the response to mouse input.
</li>
<li>
<b>MYINIT</b> initializes OpenGL state variables dealing with viewing and attributes.
</li>
<li>
<b>MYRESHAPE</b> determines the window mapping.
</li>
<li>
<b>R8_MAX</b> returns the maximum of two R8's.
</li>
<li>
<b>R8_MIN</b> returns the minimum of two R8's.
</li>
<li>
<b>R83VEC_MAX</b> returns the maximum value in an R83VEC.
</li>
<li>
<b>R83VEC_MIN</b> returns the minimum value in an R83VEC.
</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>SPIN_IMAGE</b> adjusts the angle of rotation and redisplays the picture.
</li>
<li>
<b>TIMESTAMP</b> prints the current YMDHMS date as a time stamp.
</li>
<li>
<b>XYZ_DATA_PRINT</b> prints the data for an XYZ file.
</li>
<li>
<b>XYZ_DATA_READ</b> reads the data in an XYZ file.
</li>
<li>
<b>XYZ_HEADER_PRINT</b> prints the header of an XYZ file.
</li>
<li>
<b>XYZ_HEADER_READ</b> reads the header of an XYZ file.
</li>
<li>
<b>XYZF_DATA_PRINT</b> prints the data of an XYZF file.
</li>
<li>
<b>XYZF_DATA_READ</b> reads the data in an XYZF file.
</li>
<li>
<b>XYZF_HEADER_PRINT</b> prints the header of an XYZF file.
</li>
<li>
<b>XYZF_HEADER_READ</b> determines the number of face items in an XYZF 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 01 March 2011.
</i>
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