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<title>libqhull.c -- top-level functions and basic data types</title>
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<h2>libqhull.c -- top-level functions and basic data types</h2>
<blockquote>
<p>Qhull implements the Quickhull algorithm for computing
the convex hull. The Quickhull algorithm combines two
well-known algorithms: the 2-d quickhull algorithm and
the n-d beneath-beyond algorithm. See
<a href="../../html/index.htm#description">Description of Qhull</a>. </p>
<p>This section provides an index to the top-level
functions and base data types. The top-level header file, <tt>libqhull.h</tt>,
contains prototypes for these functions.</p>
</blockquote>
<p><b>Copyright &copy; 1995-2015 C.B. Barber</b></p>
<hr>
<p><a href="#TOP">&#187;</a> <a href="qh-geom.htm#TOC">Geom</a>
<a name="TOC">&#149;</a> <a href="qh-globa.htm#TOC">Global</a>
&#149; <a href="qh-io.htm#TOC">Io</a> &#149; <a href="qh-mem.htm#TOC">Mem</a>
&#149; <a href="qh-merge.htm#TOC">Merge</a> &#149; <a href="qh-poly.htm#TOC">Poly</a>
&#149; <b>Qhull</b> &#149; <a href="qh-set.htm#TOC">Set</a>
&#149; <a href="qh-stat.htm#TOC">Stat</a> &#149; <a href="qh-user.htm#TOC">User</a>
</p>
<h3>Index to <a href="libqhull.c">libqhull.c</a>,
<a href="libqhull.h">libqhull.h</a>, and
<a href="../qhull/unix.c">unix.c</a></h3>
<ul>
<li><a href="#qtype">libqhull.h and unix.c data types and
constants</a> </li>
<li><a href="#qmacro">libqhull.h other macros</a> </li>
<li><a href="#qfunc">Quickhull routines in call order</a> </li>
<li><a href="#qinit">Top-level routines for initializing and terminating Qhull</a></li>
<li><a href="#qin">Top-level routines for reading and modifying the input</a></li>
<li><a href="#qcall">Top-level routines for calling Qhull</a></li>
<li><a href="#qout">Top-level routines for returning results</a></li>
<li><a href="#qtest">Top-level routines for testing and debugging</a></li>
</ul>
<h3><a href="qh-qhull.htm#TOC">&#187;</a><a name="qtype">libqhull.h and unix.c
data types and constants</a></h3>
<ul>
<li><a href="libqhull.h#flagT">flagT</a> Boolean flag as
a bit </li>
<li><a href="libqhull.h#boolT">boolT</a> boolean value,
either True or False </li>
<li><a href="libqhull.h#CENTERtype">CENTERtype</a> to
distinguish facet-&gt;center </li>
<li><a href="libqhull.h#qh_PRINT">qh_PRINT</a> output
formats for printing (qh.PRINTout) </li>
<li><a href="libqhull.h#qh_ALL">qh_ALL</a> argument flag
for selecting everything </li>
<li><a href="libqhull.h#qh_ERR">qh_ERR</a> Qhull exit
codes for indicating errors </li>
<li><a href="libqhull.h#qh_FILEstderr">qh_FILEstderr</a> Fake stderr
to distinguish error output from normal output [C++ only]</li>
<li><a href="../qhull/unix.c#prompt">qh_prompt</a> version and long prompt for Qhull</li>
<li><a href="../qhull/unix.c#prompt2">qh_prompt2</a> synopsis for Qhull</li>
<li><a href="../qhull/unix.c#prompt3">qh_prompt3</a> concise prompt for Qhull</li>
<li><a href="global.c#qh_version">qh_version</a> version stamp</li>
</ul>
<h3><a href="qh-qhull.htm#TOC">&#187;</a><a name="qmacro">libqhull.h other
macros</a></h3>
<ul>
<li><a href="qhull_a.h#traceN">traceN</a> print trace
message if <em>qh.IStracing &gt;= N</em>. </li>
<li><a href="qhull_a.h#QHULL_UNUSED">QHULL_UNUSED</a> declare an
unused variable to avoid warnings. </li>
</ul>
<h3><a href="qh-qhull.htm#TOC">&#187;</a><a name="qfunc">Quickhull
routines in call order</a></h3>
<ul>
<li><a href="../qhull/unix.c#main">main</a> processes the
command line, calls qhull() to do the work, and
exits </li>
<li><a href="libqhull.c#qhull">qh_qhull</a> construct
the convex hull of a set of points </li>
<li><a href="libqhull.c#build_withrestart">qh_build_withrestart</a>
allow restarts while calling qh_buildhull</li>
<li><a href="poly2.c#initbuild">qh_initbuild</a>
initialize hull and outside sets with point array</li>
<li><a href="libqhull.c#partitionall">qh_partitionall</a>
partition all points into outside sets </li>
<li><a href="libqhull.c#buildhull">qh_buildhull</a>
construct a convex hull by adding points one at a
time </li>
<li><a href="libqhull.c#nextfurthest">qh_nextfurthest</a>
return next furthest point for processing </li>
<li><a href="libqhull.c#buildtracing">qh_buildtracing</a>
trace an iteration of buildhull </li>
<li><a href="libqhull.c#addpoint">qh_addpoint</a> add a
point to the convex hull </li>
<li><a href="libqhull.c#findhorizon">qh_findhorizon</a>
find the horizon and visible facets for a point </li>
<li><a href="libqhull.c#partitionvisible">qh_partitionvisible</a>
partition points from facets in qh.visible_list
to facets in qh.newfacet_list </li>
<li><a href="libqhull.c#partitionpoint">qh_partitionpoint</a>
partition a point as inside, coplanar with, or
outside a facet </li>
<li><a href="libqhull.c#partitioncoplanar">qh_partitioncoplanar</a>
partition coplanar point into a facet </li>
<li><a href="libqhull.c#precision">qh_precision</a> restart on precision errors if not merging and if 'QJn'</li>
</ul>
<h3><a href="qh-qhull.htm#TOC">&#187;</a><a name="qinit">Top-level routines for initializing and terminating Qhull (in other modules)</a></h3>
<ul>
<li><a href="global.c#freebuild">qh_freebuild</a>
free memory used by qh_initbuild and qh_buildhull
</li>
<li><a href="global.c#checkflags">qh_checkflags</a>
check flags for multiple frontends to qhull
<li><a href="global.c#freeqhull">qh_freeqhull</a>
free memory used by qhull </li>
<li><a href="global.c#init_A">qh_init_A</a> called
before error handling initialized </li>
<li><a href="global.c#init_B">qh_init_B</a> called
after points are defined </li>
<li><a href="global.c#initflags">qh_initflags</a> set
flags and constants from command line </li>
<li><a href="rboxlib.c#rboxpoints">qh_rboxpoints</a>
generate points for qhull </li>
<li><a href="global.c#restore_qhull">qh_restore_qhull</a>
restores a saved qhull </li>
<li><a href="global.c#save_qhull">qh_save_qhull</a>
saves qhull for later restoring </li>
<li><a href="user.c#user_memsizes">qh_user_memsizes</a>
define additional quick allocation sizes
</li>
</ul>
<h3><a href="qh-qhull.htm#TOC">&#187;</a><a name="qin">Top-level routines for reading and modifying the input (in other modules)</a></h3>
<ul>
<li><a href="geom2.c#gram_schmidt">qh_gram_schmidt</a>
implements Gram-Schmidt orthogonalization by rows </li>
<li><a href="geom2.c#projectinput">qh_projectinput</a>
project input along one or more dimensions +
Delaunay projection </li>
<li><a href="geom2.c#randommatrix">qh_randommatrix</a>
generate a random dimXdim matrix in range (-1,1) </li>
<li><a href="io.c#readpoints">qh_readpoints</a> read
points from input </li>
<li><a href="geom2.c#rotateinput">qh_rotateinput</a> rotate
input points using row matrix </li>
<li><a href="geom2.c#scaleinput">qh_scaleinput</a> scale
input points using qh low_bound/high_bound </li>
<li><a href="geom2.c#setdelaunay">qh_setdelaunay</a> project
points to paraboloid for Delaunay triangulation </li>
<li><a href="geom2.c#sethalfspace_all">qh_sethalfspace_all</a>
generate dual for halfspace intersection with interior
point </li>
</ul>
<h3><a href="qh-qhull.htm#TOC">&#187;</a><a name="qcall">Top-level routines for calling Qhull (in other modules)</a></h3>
<ul>
<li><a href="libqhull.c#addpoint">qh_addpoint</a> add
point to convex hull </li>
<li><a href="poly2.c#findbestfacet">qh_findbestfacet</a>
find facet that is furthest below a point </li>
<li><a href="poly2.c#findfacet_all">qh_findfacet_all</a>
exhaustive search for facet below a point </li>
<li><a href="libqhull.c#qhull">qh_qhull</a> construct
the convex hull of a set of points </li>
</ul>
<h3><a href="qh-qhull.htm#TOC">&#187;</a><a name="qout">Top-level routines for returning results (in other modules)</a></h3>
<ul>
<li><a href="stat.c#collectstatistics">qh_collectstatistics</a>
collect statistics for qh.facet_list </li>
<li><a href="poly2.c#nearvertex">qh_nearvertex</a>
return nearest vertex to point </li>
<li><a href="poly2.c#point">qh_point</a> return point
for a point ID </li>
<li><a href="poly2.c#pointfacet">qh_pointfacet</a>
return temporary set of facets indexed by point
ID </li>
<li><a href="poly.c#pointid">qh_pointid</a> return ID
for a point</li>
<li><a href="poly2.c#pointvertex">qh_pointvertex</a>
return vertices (if any) for all points</li>
<li><a href="stat.c#printallstatistics">qh_printallstatistics</a>
print all statistics </li>
<li><a href="io.c#printneighborhood">qh_printneighborhood</a>
print neighborhood of one or two facets </li>
<li><a href="libqhull.c#printsummary">qh_printsummary</a>
print summary </li>
<li><a href="io.c#produce_output">qh_produce_output</a>
print the results of qh_qhull() </li>
<li><a href="poly2.c#setvoronoi_all">qh_setvoronoi_all</a>
compute Voronoi centers for all facets </li>
</ul>
<h3><a href="qh-qhull.htm#TOC">&#187;</a><a name="qtest">Top-level routines for testing and debugging (in other modules)</a></h3>
<ul>
<li><a href="io.c#dfacet">dfacet</a> print facet by
ID from debugger </li>
<li><a href="io.c#dvertex">dvertex</a> print vertex
by ID from debugger </li>
<li><a href="poly2.c#check_output">qh_check_output</a>
check output </li>
<li><a href="poly2.c#check_points">qh_check_points</a>
verify that all points are inside the convex hull
</li>
<li><a href="user.c#errexit">qh_errexit</a> report
error with a facet and a ridge</li>
<li><a href="libqhull.c#errexit2">qh_errexit2</a> report
error with two facets </li>
<li><a href="user.c#errprint">qh_errprint</a> print
erroneous facets, ridge, and vertex </li>
<li><a href="user.c#printfacetlist">qh_printfacetlist</a>
print all fields for a list of facets </li>
</ul>
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<p><a href="http://www.geom.uiuc.edu/"><img
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Geometry Center Home Page </i></p>
<p>Comments to: <a href=mailto:qhull@qhull.org>qhull@qhull.org</a>
</a><br>
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