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<html>
<head>
<title>
GRF_TO_EPS - Convert a GRF file to EPS format
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
GRF_TO_EPS <br> Convert a GRF file to EPS format
</h1>
<hr>
<p>
<b>GRF_TO_EPS</b>
is a FORTRAN90 program which
converts a GRF "graph" file (a format used
by the Combinatorica program) to a EPS image file.
</p>
<p>
In other words, it can draw a picture of an abstract graph.
</p>
<h3 align = "center">
Usage:
</h3>
<p>
<dl>
<dt>
<b>grf_to_eps</b> <i>file.grf</i> <i>file.eps</i>
</dt>
<dd>
reads the GRF file <i>file.grf</i> and makes an Encapsulated
PostScript image file in <i>file.eps</i>.
</dd>
</dl>
</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">
Related Data and Programs:
</h3>
</p>
<a href = "../../data/eps/eps.html">
EPS</a>,
a data format which
is used when an image is to be printed
on a PostScript printer, or displayed with programs such as
GhostView or GhostScript.
</p>
<p>
<a href = "../../examples/eps_to_jpg/eps_to_jpg.html">
EPS_TO_JPG</a>,
a BASH script which
converts a collection of EPS files to JPEG format.
</p>
<p>
<a href = "../../examples/eps_to_png/eps_to_png.html">
EPS_TO_PNG</a>,
a BASH script which
converts a collection of EPS files to PNG format.
</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 which
contains 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 defining a mathematical graph and
displays it in the MATLAB graphics window.
</p>
<p>
<a href = "../../cpp_src/grf_display_opengl/grf_display_opengl.html">
GRF_DISPLAY_OPENGL</a>,
a C++ program which
reads a GRF file defining a mathematical graph and
displays it in an OpenGL graphics window.
</p>
<p>
<a href = "../../f_src/grf_io/grf_io.html">
GRF_IO</a>,
a FORTRAN90 library which
reads and writes GRF files.
</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/ps_write/ps_write.html">
PS_WRITE</a>,
a FORTRAN90 library which
creates PostScript images.
</p>
<h3 align = "center">
Reference:
</h3>
<p>
<ol>
<li>
Stephen Skiena,<br>
Implementing Discrete Mathematics:
Combinatorics and Graph Theory in Mathematica,<br>
Addison Wesley, 1990.
</li>
<li>
<a href = "http://www.combinatorica.com/">
http://www.combinatorica.com/<a> <br>
the COMBINATORICA web page.
</li>
<li>
Peter Eades, Ian Fogg, David Kelly,<br>
SPREMB: A System for Developing Graph Algorithms,<br>
Congressus Numerantium,<br>
Volume 66, December 1988.
</li>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "grf_to_eps.f90">grf_to_eps.f90</a>, the source code.
</li>
<li>
<a href = "grf_to_eps.sh">grf_to_eps.sh</a>,
commands to compile, link and load the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<b>HEAWOOD</b> is the Heawood graph:
<ul>
<li>
<a href = "../../data/grf/heawood.grf">heawood.grf</a>,
the Heawood graph.
</li>
<li>
<a href = "../../data/png/heawood.png">heawood.png</a>,
a <a href = "../../data/png/png.html">PNG</a> image of
the Heawood graph.
</li>
</ul>
</p>
<p>
<b>KNIGHTSTOUR</b> is the knight's tour graph:
<ul>
<li>
<a href = "../../data/grf/knightstour.grf">knightstour.grf</a>,
the knight's tour graph.
</li>
<li>
<a href = "../../data/png/knightstour.png">knightstour.png</a>,
a <a href = "../../data/png/png.html">PNG</a> image of
the knight's tour graph.
</li>
</ul>
</p>
<p>
<b>PETERSEN</b> is the Petersen graph:
<ul>
<li>
<a href = "../../data/grf/petersen.grf">petersen.grf</a>,
the Petersen graph.
</li>
<li>
<a href = "../../data/png/petersen.png">petersen.png</a>,
a <a href = "../../data/png/png.html">PNG</a> image of
the Petersen graph.
</li>
</ul>
</p>
<p>
<b>TUTTE</b> is the Tutte graph:
<ul>
<li>
<a href = "../../data/grf/tutte.grf">tutte.grf</a>, the Tutte graph.
</li>
<li>
<a href = "../../data/png/tutte.png">tutte.png</a>,
a <a href = "../../data/png/png.html">PNG</a> image of
the Tutte graph.
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>MAIN</b> is the main program for GRF_TO_EPS.
</li>
<li>
<b>BOX_CLIP_LINE_2D</b> uses a box to clip a line segment in 2D.
</li>
<li>
<b>CH_CAP</b> capitalizes a single character.
</li>
<li>
<b>CH_EQI</b> is a case insensitive comparison of two characters for equality.
</li>
<li>
<b>CH_TO_DIGIT</b> returns the integer value of a base 10 digit.
</li>
<li>
<b>EPS_FILE_HEAD</b> writes header information to an encapsulated PostScript file.
</li>
<li>
<b>EPS_FILE_TAIL</b> writes trailer information to an encapsulated PostScript file.
</li>
<li>
<b>FILE_NAME_EXT_GET</b> determines the "extension" of a file name.
</li>
<li>
<b>FILE_NAME_EXT_SWAP</b> replaces the current "extension" of a file name.
</li>
<li>
<b>GET_UNIT</b> returns a free FORTRAN unit number.
</li>
<li>
<b>GRAPH_ARC_TO_EPS</b> writes graph information to an Encapsulated PostScript file.
</li>
<li>
<b>GRF_READ</b> reads a GRF file containing a 2D representation of a graph.
</li>
<li>
<b>GRF_TO_EPS</b> creates an EPS image of the graph described by a GRF file.
</li>
<li>
<b>I4_SWAP</b> swaps two I4's.
</li>
<li>
<b>POINT_INSIDE_BOX_2D</b> determines if a point is inside a box in 2D.
</li>
<li>
<b>PS_COLOR_FILL_SET</b> sets the fill color.
</li>
<li>
<b>PS_COLOR_LINE</b> handles the line color.
</li>
<li>
<b>PS_COLOR_LINE_SET</b> sets the line color.
</li>
<li>
<b>PS_COMMENT</b> inserts a comment into the PostScript file.
</li>
<li>
<b>PS_DEFAULT</b> sets the internal settings to their default values
</li>
<li>
<b>PS_FILE_CLOSE</b> closes a PostScript file.
</li>
<li>
<b>PS_FILE_OPEN</b> opens a new version of a PostScript file with a given name.
</li>
<li>
<b>PS_LINE</b> draws a line segment from (X1,Y1) to (X2,Y2).
</li>
<li>
<b>PS_LINE_CLOSED</b> adds the graph of a closed line to a PostScript file.
</li>
<li>
<b>PS_LINE_WIDTH</b> sets the line width.
</li>
<li>
<b>PS_MARK_DISK</b> marks a point with a small filled disk.
</li>
<li>
<b>PS_PAGE_HEAD</b> writes header information on a new page.
</li>
<li>
<b>PS_PAGE_TAIL</b> writes tail information at the end of a page.
</li>
<li>
<b>PS_SETTING_INT</b> sets, gets, or prints integer internal PS_WRITE parameters.
</li>
<li>
<b>PS_SETTING_REAL</b> sets, gets, or prints real internal PS_WRITE parameters.
</li>
<li>
<b>R8_SWAP</b> swaps two real values.
</li>
<li>
<b>S_EQI</b> is a case insensitive comparison of two strings for equality.
</li>
<li>
<b>S_INDEX_LAST</b> finds the LAST occurrence of a given substring.
</li>
<li>
<b>S_TO_I4</b> reads an I4 from a string.
</li>
<li>
<b>S_TO_R8</b> reads an R8 from 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 = "../f_src.html">
the FORTRAN90 source codes</a>.
</p>
<hr>
<i>
Last revised on 15 November 2006.
</i>
<!-- John Burkardt -->
</body>
</html>