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<html>
<head>
<title>
XYL_DISPLAY_OPENGL - Display 2D Points and Lines Using OpenGL
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
XYL_DISPLAY_OPENGL<br> Display 2D Points and Lines Using OpenGL
</h1>
<hr>
<p>
<b>XYL_DISPLAY_OPENGL</b>
is a C++ program which
reads XYL information defining points and lines in 2D,
and draws a picture using <b>OPENGL</b>.
</p>
<p>
The point and line information is stored in a pair of files,
called the <b>XYL</b> format. Essentially, the first file
stores a list of point coordinates, and the second lists point indices
to be connected in lines.
</p>
<h3 align = "center">
Usage:
</h3>
<p>
<blockquote>
<b>xyl_display_opengl</b> <i>prefix</i>
</blockquote>
where
<ul>
<li>
<i>prefix</i> is the common prefix for the point and line data files.
</li>
</ul>
reads the point coordinate data from <i>prefix.xy</i> and the
point index lists from <i>prefix.xyl</i> and displays a plot of the points
and lines.
</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>XYL_DISPLAY_OPENGL</b> is available in
<a href = "../../cpp_src/xyl_display_opengl/xyl_display_opengl.html">a C++ version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../m_src/box_plot/box_plot.html">
BOX_PLOT</a>,
a MATLAB program which
can color in specified entries of
a checkerboard, corresponding to pairs of integer data.
</p>
<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 = "../../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
plays John Conway's "Game of Life", using OpenGL to display the results.
</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/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 = "../../f_src/table_delaunay/table_delaunay.html">
TABLE_DELAUNAY</a>,
a FORTRAN90 program which
computes the Delaunay triangulation of a set of points.
</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 = "../../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 = "../../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 = "../../m_src/xyl_display/xyl_display.html">
XYL_DISPLAY</a>,
a MATLAB program which
reads XYL information defining points and lines in 2D,
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 = "xyl_display_opengl.cpp">
xyl_display_opengl.cpp</a>, the source code.
</li>
<li>
<a href = "xyl_display_opengl.sh">xyl_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 = "house.xy">house.xy</a>,
point coordinates.
</li>
<li>
<a href = "house.xyl">house.xyl</a>,
point indices to be connected as lines.
</li>
<li>
<a href = "house.png">house.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 XYL_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>DTABLE_DATA_READ</b> reads the data from a real TABLE file.
</li>
<li>
<b>DTABLE_HEADER_READ</b> reads the header from a real TABLE 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.
</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>TIMESTRING</b> returns the current YMDHMS date as a string.
</li>
<li>
<b>XY_DATA_READ</b> reads the data in an XY file.
</li>
<li>
<b>XY_HEADER_READ</b> reads the header of an XY file.
</li>
<li>
<b>XYL_DATA_READ</b> reads the data in an XYL file.
</li>
<li>
<b>XYL_HEADER_READ</b> determines the number of line items in 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 06 January 2009.
</i>
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