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sweep2_delaunay_eps.html
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<html>
<head>
<title>
SWEEP2_DELAUNAY_EPS - Plot the SWEEP2 Delaunay Triangulation
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
SWEEP2_DELAUNAY_EPS <br> Plot the SWEEP2 Delaunay Triangulation
</h1>
<hr>
<p>
<b>SWEEP2_DELAUNAY_EPS</b>
is a FORTRAN90 program which
plots the
Delaunay triangulation output from
<a href = "../../c_src/sweep2/sweep2.html">
sweep2</a>.
</p>
<h3 align = "center">
Usage:
</h3>
<p>
<dl>
<dt>
<b>sweep2_delaunay_eps</b> <i>points</i> <i>triangles</i> <i>graph</i>
</dt>
<dd>
<i>points</i> is a text file of point coordinates. Each line lists
the <b>x</b> and <b>y</b> coordinates of one point. This file
can be considered a comment-free form of a real TABLE file.<br>
<i>triangles</i> is a text file of triangle descriptions created by
<b>sweep2</b>. Each line lists indices of the three points that make
up a triangle. Indices are counted starting at 0. This file
can be considered a comment-free form of an integer TABLE file.<br>
<i>graph</i>: is an Encapsulated PostScript file containing an image of
the Delaunay triangulation.
</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 = "../../c_src/sweep2/sweep2.html">
SWEEP2</a>,
a C program which
performs the Delaunay
triangulation of a set of points, by Steve Fortune.
</p>
<p>
<a href = "../../f_src/sweep2_voronoi_eps/sweep2_voronoi_eps.html">
SWEEP2_VORONOI_EPS</a>,
a FORTRAN90 program which
produces an Encapsulated
PostScript image of the Voronoi diagram of a set of points, as
processed by the SWEEP2 program.
</p>
<h3 align = "center">
Reference:
</h3>
<p>
<ol>
<li>
Franz Aurenhammer,<br>
Voronoi diagrams -
a study of a fundamental geometric data structure,<br>
ACM Computing Surveys,<br>
Volume 23, pages 345-405, September 1991.
</li>
<li>
Steve Fortune,<br>
A Sweepline Algorithm for Voronoi Diagrams,<br>
Algorithmica, Volume 2, pages 153-174, 1987.
</li>
<dd>
A copy of the original release of the SWEEP2 code is available through
NETLIB at
<a href = "http://www.netlib.org/voronoi/sweep2">
http://www.netlib.org/voronoi/sweep2</a>
</dd>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "sweep2_delaunay_eps.f90">sweep2_delaunay_eps.f90</a>,
the source code.
</li>
<li>
<a href = "sweep2_delaunay_eps.csh">sweep2_delaunay_eps.csh</a>,
commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<b>DIAMOND</b> is a simple pointset of 9 points:
<ul>
<li>
<a href = "diamond.txt">diamond.txt</a>,
the file containing the point coordinates.
</li>
<li>
<a href = "diamond_del.txt">diamond_del.txt</a>,
the file containing the triangle information.
</li>
<li>
<a href = "diamond_del.png">diamond_del.png</a>,
a <a href = "../../data/png/png.html">PNG</a> image of
the triangulation.
</li>
</ul>
</p>
<p>
<b>TEST</b> is a pointset of 100 points:
<ul>
<li>
<a href = "test.txt">test.txt</a>,
the file containing the point coordinates.
</li>
<li>
<a href = "test_del.txt">test_del.txt</a>,
the file containing the triangle information.
</li>
<li>
<a href = "test_del.png">test_del.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 SWEEP2_DELAUNAY_EPS.
</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>DTABLE_DATA_READ</b> reads data from a double precision table file.
</li>
<li>
<b>DTABLE_HEADER_READ</b> reads the header from a double precision table file.
</li>
<li>
<b>DTABLE_PRINT</b> prints a double precision matrix.
</li>
<li>
<b>DTABLE_PRINT_SOME</b> prints some of a double precision matrix.
</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>GET_FILENAMES</b> gets the filenames from commandline or user.
</li>
<li>
<b>GET_UNIT</b> returns a free FORTRAN unit number.
</li>
<li>
<b>I4_MODP</b> returns the nonnegative remainder of integer division.
</li>
<li>
<b>I4_WRAP</b> forces an integer to lie between given limits by wrapping.
</li>
<li>
<b>ITABLE_DATA_READ</b> reads data from an integer table file.
</li>
<li>
<b>ITABLE_HEADER_READ</b> reads the header from an integer table file.
</li>
<li>
<b>ITABLE_PRINT</b> prints an integer matrix.
</li>
<li>
<b>ITABLE_PRINT_SOME</b> prints some of an integer matrix.
</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> writes the current YMDHMS date into a string.
</li>
<li>
<b>TRIANGULATION_PLOT_EPS</b> plots a triangulation of a pointset.
</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 13 November 2006.
</i>
<!-- John Burkardt -->
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