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<h1>Qhull functions, macros, and data structures</h1>
<blockquote>
<p>The following sections provide an overview and index to
Qhull's functions, macros, and data structures. Each
section starts with an introduction. Also see <a href=../html/qh-in.htm#library>Calling
Qhull from your program</a>.</p>
<p>Qhull uses the following conventions:</p>
<blockquote>
<ul>
<li>in code, global variables start with "qh "
<li>in documentation, global variables start with 'qh.'
<li>constants start with an upper case word
<li>important globals include an '_'
<li>functions, macros, and constants start with "qh_"</li>
<li>data types end in "T"</li>
<li>macros with arguments end in "_"</li>
<li>iterators are macros that use local variables</li>
<li>iterators for sets start with "FOREACH"</li>
<li>iterators for lists start with "FORALL"</li>
<li>qhull options are in single quotes (e.g., 'Pdn')</li>
<li>lists are sorted alphabetically</li>
<li>preprocessor directives on left margin for older compilers</li>
</ul>
</blockquote>
<p>
When reading the code, please note that the
global data structure, 'qh', is a macro. It
either expands to "qh_qh." or to
"qh_qh->". The later is used for
applications which run concurrent calls to qh_qhull().
<p>
When reading code with an editor, a search for
<i>"procedure</i>
will locate the header of <i>qh_procedure</i>. A search for <i>* procedure</i>
will locate the tail of <i>qh_procedure</i>.
<p>A useful starting point is <a href="qhull.h">qhull.h</a>. It defines most
of Qhull data structures and top-level functions. Search for <i>'PFn'</i> to
determine the corresponding constant in Qhull. Search for <i>'Fp'</i> to
determine the corresponding <a href="qhull.h#qh_PRINT">qh_PRINT...</a> constant.
Search <a href="io.c">io.c</a> to learn how the print function is implemented.</p>
<p>If your web browser loads .c and .h files with an external application,
change the MIME type of .c and .h files to "text/html".
Opera does not always work since it treats '<' characters as HTML tags.
<p>
Please report documentation and link errors
to <a href="mailto:qhull-bug@qhull.org">qhull-bug@qhull.org</a>.
<p>
<i>Brad Barber, Cambridge MA, June 1, 2002</i>
</p>
</blockquote>
<p><b>Copyright © 1997-2003 The Geometry Center, Minneapolis MN</b></p>
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