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<h1>Qhull functions, macros, and data structures</h1>
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<p>The following sections provide an overview and index to
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Qhull's functions, macros, and data structures. Each
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section starts with an introduction. If you use Opera, the source code links back to this documentation.
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See also <a href=../../html/qh-code.htm#library>Calling
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Qhull from C programs</a> and <a href="../../html/qh-code.htm#cpp">Calling Qhull from C++ programs</a>.</p>
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<p>Qhull uses the following conventions:</p>
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<li>in code, global variables start with "qh "
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<li>in documentation, global variables start with 'qh.'
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<li>constants start with an upper case word
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<li>important globals include an '_'
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<li>functions, macros, and constants start with "qh_"</li>
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<li>data types end in "T"</li>
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<li>macros with arguments end in "_"</li>
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<li>iterators are macros that use local variables</li>
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<li>iterators for sets start with "FOREACH"</li>
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<li>iterators for lists start with "FORALL"</li>
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<li>qhull options are in single quotes (e.g., 'Pdn')</li>
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<li>lists are sorted alphabetically</li>
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<li>preprocessor directives on left margin for older compilers</li>
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When reading the code, please note that the
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global data structure, 'qh', is a macro. It
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either expands to "qh_qh." or to
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"qh_qh->". The later is used for
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applications which run concurrent calls to qh_qhull().
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When reading code with an editor, a search for
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<i>"procedure</i>
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will locate the header of <i>qh_procedure</i>. A search for <i>* procedure</i>
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will locate the tail of <i>qh_procedure</i>.
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<p>A useful starting point is <a href="libqhull.h">libqhull.h</a>. It defines most
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of Qhull data structures and top-level functions. Search for <i>'PFn'</i> to
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determine the corresponding constant in Qhull. Search for <i>'Fp'</i> to
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determine the corresponding <a href="libqhull.h#qh_PRINT">qh_PRINT...</a> constant.
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Search <a href="io.c">io.c</a> to learn how the print function is implemented.</p>
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<p>If your web browser loads .c and .h files with an external application,
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change the MIME type of .c and .h files to "text/html".
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Opera does not always work since it treats '<' characters as HTML tags.
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Please report documentation and link errors
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to <a href="mailto:qhull-bug@qhull.org">qhull-bug@qhull.org</a>.
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<p><b>Copyright © 1997-2012 C.B. Barber</b></p>
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<h2><a href="#TOP">»</a><a name="TOC">Qhull files</a> </h2>
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<p>This sections lists the .c and .h files for Qhull. Please
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refer to these files for detailed information.</p>
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<dt><a href="../../Makefile"><b>Makefile</b></a><b>, </b><a href="../../CMakeLists.txt"><b>CMakeLists.txt</b></a></dt>
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<dd><tt>Makefile</tt> is preconfigured for gcc. <tt>CMakeLists.txt</tt> supports multiple
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platforms with <a href=http://www.cmake.org/>CMake</a>.
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Qhull includes project files for Visual Studio and Qt.
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<dt><a href="libqhull.h"><b>libqhull.h</b></a> </dt>
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<dd>Include file for the Qhull library (<tt>libqhull.so</tt>, <tt>qhull.dll</tt>, <tt>libqhullstatic.a</tt>).
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Data structures are documented under <a href="qh-poly.htm">Poly</a>.
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Global variables are documented under <a href="qh-globa.htm">Global</a>.
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Other data structures and variables are documented under
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<a href="qh-qhull.htm#TOC">Qhull</a> or <a href="qh-geom.htm"><b>Geom</b></a><b>.</b></dd>
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<dt><a href="qh-geom.htm"><b>Geom</b></a><b>, </b>
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<a href="geom.h"><b>geom.h</b></a><b>, </b>
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<a href="geom.c"><b>geom.c</b></a><b>, </b>
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<a href="geom2.c"><b>geom2.c</b></a><b>, </b>
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<a href="random.c"><b>random.c</b></a><b>, </b>
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<a href="random.h"><b>random.h</b></a></dt>
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<dd>Geometric routines. These routines implement mathematical
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functions such as Gaussian elimination and geometric
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routines needed for Qhull. Frequently used routines are
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in <tt>geom.c</tt> while infrequent ones are in <tt>geom2.c</tt>.
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<dt><a href="qh-globa.htm"><b>Global</b></a><b>, </b>
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<a href="global.c"><b>global.c</b></a><b>, </b>
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<a href="libqhull.h"><b>libqhull.h</b></a> </dt>
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<dd>Global routines. Qhull uses a global data structure, <tt>qh</tt>,
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to store globally defined constants, lists, sets, and
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<tt>global.c</tt> initializes and frees these
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<dt><a href="qh-io.htm"><b>Io</b></a><b>, </b><a href="io.h"><b>io.h</b></a><b>,
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</b><a href="io.c"><b>io.c</b></a> </dt>
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<dd>Input and output routines. Qhull provides a wide range of
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input and output options.</dd>
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<dt><a href="qh-mem.htm"><b>Mem</b></a><b>, </b>
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<a href="mem.h"><b>mem.h</b></a><b>, </b>
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<a href="mem.c"><b>mem.c</b></a> </dt>
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<dd>Memory routines. Qhull provides memory allocation and
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deallocation. It uses quick-fit allocation.</dd>
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<dt><a href="qh-merge.htm"><b>Merge</b></a><b>, </b>
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<a href="merge.h"><b>merge.h</b></a><b>, </b>
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<a href="merge.c"><b>merge.c</b></a> </dt>
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<dd>Merge routines. Qhull handles precision problems by
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merged facets or joggled input. These routines merge simplicial facets,
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merge non-simplicial facets, merge cycles of facets, and
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rename redundant vertices.</dd>
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<dt><a href="qh-poly.htm"><b>Poly</b></a><b>, </b>
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<a href="poly.h"><b>poly.h</b></a><b>, </b>
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<a href="poly.c"><b>poly.c</b></a><b>, </b>
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<a href="poly2.c"><b>poly2.c</b></a><b>, </b>
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<a href="libqhull.h"><b>libqhull.h</b></a> </dt>
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<dd>Polyhedral routines. Qhull produces a polyhedron as a
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list of facets with vertices, neighbors, ridges, and
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geometric information. <tt>libqhull.h</tt> defines the main
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data structures. Frequently used routines are in <tt>poly.c</tt>
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while infrequent ones are in <tt>poly2.c</tt>.</dd>
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<dt><a href="qh-qhull.htm#TOC"><b>Qhull</b></a><b>, </b>
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<a href="libqhull.c"><b>libqhull.c</b></a><b>, </b>
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<a href="libqhull.h"><b>libqhull.h</b></a><b>, </b>
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<a href="qhull_a.h"><b>qhull_a.h</b></a><b>, </b>
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<a href="../qhull/unix.c"><b>unix.c</b></a> <b>, </b>
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<a href="../qconvex/qconvex.c"><b>qconvex.c</b></a> <b>, </b>
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<a href="../qdelaunay/qdelaun.c"><b>qdelaun.c</b></a> <b>, </b>
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<a href="../qhalf/qhalf.c"><b>qhalf.c</b></a> <b>, </b>
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<a href="../qvoronoi/qvoronoi.c"><b>qvoronoi.c</b></a> </dt>
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<dd>Top-level routines. The Quickhull algorithm is
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implemented by <tt>libqhull.c</tt>. <tt>qhull_a.h</tt>
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includes all header files. </dd>
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<dt><a href="qh-set.htm"><b>Set</b></a><b>, </b>
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<a href="qset.h"><b>qset.h</b></a><b>, </b>
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<a href="qset.c"><b>qset.c</b></a> </dt>
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<dd>Set routines. Qhull implements its data structures as
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sets. A set is an array of pointers that is expanded as
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needed. This is a separate package that may be used in
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other applications. </dd>
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<dt><a href="qh-stat.htm"><b>Stat</b></a><b>, </b>
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<a href="stat.h"><b>stat.h</b></a><b>, </b>
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<a href="stat.c"><b>stat.c</b></a> </dt>
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<dd>Statistical routines. Qhull maintains statistics about
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its implementation. </dd>
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<dt><a href="qh-user.htm"><b>User</b></a><b>, </b>
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<a href="user.h"><b>user.h</b></a><b>, </b>
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<a href="user.c"><b>user.c</b></a><b>, </b>
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<a href="../user_eg/user_eg.c"><b>user_eg.c</b></a><b>, </b>
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<a href="../user_eg2/user_eg2.c"><b>user_eg2.c</b></a><b>, </b>
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<a href="../user_eg3/user_eg3.cpp"><b>user_eg3.cpp</b></a><b>, </b>
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<a href="../libqhullcpp/qhull_interface.cpp#TOP"><b>qhull_interface.cpp</b></a></dt>
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<dd>User-defined routines. Qhull allows the user to configure
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the code with defined constants and specialized routines.
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<p><!-- Navigation links --> </p>
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<a href="http://www.qhull.org">Home page for
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<b>Up:</b> <a href="../../html/index.htm#TOC">Qhull manual: Table of Contents</a> <br>
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<b>Up:</b> <a href="../../html/qh-quick.htm#programs">Programs</a>
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• <a href="../../html/qh-quick.htm#options">Options</a>
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• <a href="../../html/qh-optf.htm#format">Formats</a>
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• <a href="../../html/qh-optp.htm#print">Print</a>
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• <a href="../../html/qh-optt.htm#trace">Trace</a><br>
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<b>Up:</b> <a href="../../html/qh-code.htm#TOC">Qhull code: Table of Contents</a> <br>
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<b>To:</b> <a href="#TOC">Qhull files</a><br>
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<b>To:</b> <a href="qh-geom.htm">Geom</a> •
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<a href="qh-globa.htm">Global</a> • <a href="qh-io.htm">Io</a>
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• <a href="qh-mem.htm">Mem</a> • <a href="qh-merge.htm">Merge</a>
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• <a href="qh-poly.htm">Poly</a> • <a href="qh-qhull.htm#TOC">Qhull</a>
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• <a href="qh-set.htm">Set</a> • <a href="qh-stat.htm">Stat</a>
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• <a href="qh-user.htm">User</a><br>
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<p><!-- GC common information --> </p>
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<p><a href="http://www.geom.uiuc.edu/"><img
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src="../../html/qh--geom.gif" align="middle" width="40" height="40"></a><i>The
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Geometry Center Home Page </i></p>
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<p>Comments to: <a href=mailto:qhull@qhull.org>qhull@qhull.org</a>
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Created: May 2, 1997 --- <!-- hhmts start --> Last modified: see top <!-- hhmts end --> </p>
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