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Landon Curt Noll a1c86c8a7a add original C links to entry navigation bars
The navigation bar for a winning entry now has a "_Original C_" link
(between the ✅ and the Inventory on the right hand side) so that one
may easily view the original C code that was submitted for IOCCC judging.

Ran `make www timestamp` to perform the above.
2025-08-10 12:46:23 -07:00

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<h1>The International Obfuscated C Code Contest</h1>
<h2>2005/boutines - Most superfluous output</h2>
<h3>Voronoi diagram generator</h3>
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<a class="Left" href="../anon/index.html">&larr; 2005/anon</a>
<a class="Left" href="../index.html">&uarr; 2005 &uarr;</a>
<a class="Left" href="../chia/index.html">2005/chia &rarr;</a>
<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2005/boutines/boutines.c">C code</a>
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<h2 id="author">Author:</h2>
<ul>
<li>Name: <a href="../../authors.html#Francois_Boutines">Francois Boutines</a><br>
Location: <a href="../../location.html#FR">FR</a> - <em>French Republic</em> (<em>France</em>)</li>
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<h2 id="to-build">To build:</h2>
<pre><code> make</code></pre>
<p>You will need an <a href="https://www.w3.org/TR/SVG11/expanded-toc.html">SVG</a> viewer or
a converter like <a href="https://imagemagick.org/index.php">ImageMagick</a>’s <code>convert</code>.
See the FAQ on “<a href="../../faq.html#imagemagick">ImageMagick</a>” for more details and
this list of <a href="https://www.w3.org/Graphics/SVG/WG/wiki/Implementations">SVG Viewer
Implementations</a>,
should you need more help.</p>
<h2 id="to-use">To use:</h2>
<pre><code> ./boutines &lt; input &gt; output.svg</code></pre>
<h2 id="try">Try:</h2>
<pre><code> ./try.sh</code></pre>
<p>If <code>ruby</code> is installed <a href="https://github.com/ioccc-src/winner/blob/master/2005/boutines/try.sh">try.sh</a> will generate an SVG file by:</p>
<pre><code> ruby -e &#39;20.times{puts &quot;#{rand} #{rand}&quot;}&#39; | ./boutines &gt; test.svg</code></pre>
<p>It will also create an SVG file with the file <a href="input.txt">input.txt</a>.</p>
<p>The script will check if <code>convert</code> is available and if so it will try converting
the SVG file(s) to PNG file(s) which you should be able to view in most any
graphics viewer, editor or web browser.</p>
<p>If you have a program that opens
<a href="https://www.w3.org/TR/SVG11/expanded-toc.html">SVG</a> files then you could open
the <code>test.svg</code> and <code>result.svg</code> files directly. An example program is
<a href="https://inkscape.org">Inkscape</a>. See the
<a href="https://www.w3.org/Graphics/SVG/WG/wiki/Implementations">list</a> cited above for
others.</p>
<h2 id="judges-remarks">Judges’ remarks:</h2>
<p>Can you explain the author’s remark “[generated files] are not as scalable as
their name suggests”?</p>
<h2 id="authors-remarks">Author’s remarks:</h2>
<p><em>In memory of my father Pierre Boutines-Vignard.</em></p>
<h3 id="walk-through">Walk-through</h3>
<p>My program works as follows:</p>
<h4 id="input">Input</h4>
<p>A list of 2D points in the <a href="https://en.wikipedia.org/wiki/Unit_square">unit
square</a>.</p>
<h4 id="output">Output</h4>
<p>A <a href="https://en.wikipedia.org/wiki/Voronoi_diagram">Voronoi diagram</a> of the set as
an <a href="https://www.w3.org/TR/SVG11/expanded-toc.html">SVG</a> stream.</p>
<p>This will possibly save a compressed SVG file and may be useful:</p>
<pre><code> ./boutines | gzip &gt; result.svg.gz</code></pre>
<p>Input consists of a list of floating points values separated by whitespaces
(ranging preferably in <code>[0,1]</code>). Alternating a horizontal coordinate, a
whitespace then the other coordinate (pointing downwards in the resulting
graph) and a newline will just go fine:</p>
<pre><code> 0 0
0 1
1 0
1 1
.5 .5</code></pre>
<p>Strictly speaking, you have to provide a <strong>set</strong> of points. If there are
duplicates in the list, there is no guarantee on the one to be shown (and in
addition their labels will overlap) in the resulting colored <a href="https://en.wikipedia.org/wiki/Voronoi_diagram">Voronoi
diagram</a>.</p>
<h3 id="caution">Caution</h3>
<p>This program might have been a lot shorter, but nearly impractical even for
medium sized datasets. On the other hand it could have been a lot faster, but
hard to qualify under the IOCCC size limit. So guess what I did? A compromise
favoring innermost obfuscation, sacrificing sometimes speed and other tedious
factors.</p>
<p>Therefore this entry is limited to</p>
<p><img src="eqn.png"
alt="equation of the limit of the entry"
width=232 height=43></p>
<p>points and won’t even be suitable for more than a few thousand; although
generated files did pass the <a href="https://validator.w3.org/#validate_by_upload+with_options">W3C SVG
Validator</a>, and are
highly compressible, they are not as scalable as their name suggests… For
serious applications about <a href="https://en.wikipedia.org/wiki/Voronoi_diagram">Voronoi
diagrams</a>, see
<a href="http://www.qhull.org/">Qhull</a>, <a href="https://www.cgal.org">CGAL</a> and the like but
you may still encounter large output volumes (and have to handle some sort of
clipping in order to represent properly infinite regions of the diagram in
<a href="https://www.w3.org/TR/SVG11/expanded-toc.html">SVG</a>.</p>
<p>Beware, compilation may report warnings about precision loss, linting may be a
disaster, but the code should remain portable, and the output accurate enough
for most devices (including many inkjet printers). If you ever miss precision
on a particular dataset or peripheral, you may want to dive in and let <code>U</code> be
the next power of <code>__LINE__</code>.</p>
<p><strong>NOTE</strong>: bad inputs will be sanctioned by the production of the 42nd <a href="https://en.wikipedia.org/wiki/Mersenne_prime">Mersenne
prime</a> (i.e. <code>2^25964951 -1</code>);
memory will be kept.</p>
<h3 id="why-i-think-this-code-is-obfuscated">Why I think this code is Obfuscated ?</h3>
<p>I’m quite divided on the subject because I wrote:</p>
<ul>
<li>Clear <a href="https://www.w3.org/TR/SVG11/expanded-toc.html">SVG</a> keywords but
complicated output statements.</li>
<li>No nested loops but loads of function calls.</li>
<li>Easy recursion but no clear data structure.</li>
<li>Easy maths but no use of <code>math.h</code>.</li>
<li>A single <code>if</code>.</li>
</ul>
<p>Be sure to check the antepenultimate line of code.</p>
<h3 id="missing-features">Missing Features</h3>
<h4 id="color-control">Color control</h4>
<p>Cell colors are chosen randomly (with a questionable rejection scheme). It
might have been useful to input them along with sites coordinates, turning the
application into a puzzling graphics engine.</p>
<h4 id="site-labelling">Site labelling</h4>
<p>The points are implicitly numbered in the order they were entered
(starting at one). This can be overridden however, via a simple XSL
transformation.</p>
<h4 id="site-radius">Site radius</h4>
<p>The site radius is hardcoded in the code, I still wonder why I did not
design it as a function of the underlying cell’s area (which can be averaged
for free) or at least a command line parameter. Same with the char set, the
viewport and potentially every
<a href="https://www.w3.org/TR/SVG11/expanded-toc.html">SVG</a> property.</p>
<h3 id="see-also">See Also</h3>
<ul>
<li><a href="http://en.wikipedia.org/wiki/Voronoi_diagram">Voronoi at Wikipedia</a>,</li>
<li><a href="https://web.archive.org/web/20061231032748/http://www2.toki.or.id/book/AlgDesignManual/BOOK/BOOK4/NODE187.HTM">An Excerpt from The Algorithm Design
Manual</a>.</li>
<li><a href="http://www.snibbe.com/scott/bf">Voronoi and Art</a></li>
</ul>
<h3 id="example-output">Example Output</h3>
<p><img src="Voronoi.png"
alt="image of example output: 5 regions of a 5-pointed star with 5 external regions beyond it"
width=542 height=542></p>
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<div id="inventory">
<h1 id="inventory-for-2005boutines">Inventory for 2005/boutines</h1>
</div>
<h2 id="primary-files">Primary files</h2>
<ul>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2005/boutines/boutines.c">boutines.c</a> - entry source code</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2005/boutines/Makefile">Makefile</a> - entry Makefile</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2005/boutines/boutines.orig.c">boutines.orig.c</a> - original source code</li>
<li><a href="Voronoi.png">Voronoi.png</a> - output example</li>
<li><a href="eqn.png">eqn.png</a> - equation limit for entry in png file</li>
<li><a href="input.txt">input.txt</a> - input file used by try.sh</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2005/boutines/try.sh">try.sh</a> - script to try entry</li>
</ul>
<h2 id="secondary-files">Secondary files</h2>
<ul>
<li><a href="2005_boutines.tar.bz2">2005_boutines.tar.bz2</a> - download entry tarball</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2005/boutines/README.md">README.md</a> - markdown source for this web page</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2005/boutines/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2005/boutines/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
<li><a href="https://github.com/ioccc-src/winner/blob/master/2005/boutines/.path">.path</a> - directory path from top level directory</li>
<li><a href="index.html">index.html</a> - this web page</li>
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