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<title>user.c -- user-definable operations</title>
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<h2>user.c -- user-definable operations</h2>
<blockquote>
<p>This section contains functions and constants that the
user may want to change. </p>
</blockquote>
<p><b>Copyright © 1995-2012 C.B. Barber</b></p>
<hr>
<p><a href="#TOP">»</a> <a href="qh-geom.htm#TOC">Geom</a>
<a name="TOC">•</a> <a href="qh-globa.htm#TOC">Global</a>
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<h3>Index to <a href="user.c">user.c</a>, <a href="usermem.c">usermem.c</a>, <a href="userprintf.c">userprintf.c</a>, <a href="userprintf_rbox.c">userprintf_rbox.c</a> and
<a href="user.h">user.h</a></h3>
<ul>
<li><a href="#qulllib">qhull library constants</a></li>
<li><a href="#utype">user.h data types and
configuration macros</a> </li>
<li><a href="#ujoggle">joggle constants</a></li>
<li><a href="#uperform">performance related constants</a></li>
<li><a href="#umemory">memory constants</a></li>
<li><a href="#ucond">conditional compilation</a></li>
<li><a href="#umerge">merge constants</a> </li>
<li><a href="#ufunc">user.c functions</a> </li>
<li><a href="#u2func">usermem.c functions</a> </li>
<li><a href="#u3func">userprintf.c functions</a> </li>
</ul>
<h3><a href="qh-user.htm#TOC">»</a><a name="qulllib">Qhull library constants</a></h3>
<ul>
<li><a href="user.h#filenamelen">FILENAMElen</a> -- max length of TI or TO filename </li>
<li><a href="user.h#msgcode">msgcode</a> -- unique message codes for qh_fprintf </li>
<li><a href="user.h#qh_OPTIONline">qh_OPTIONline</a> -- max length of option line ('FO')</li>
</ul>
<h3><a href="qh-user.htm#TOC">»</a><a name="utype">user.h data
types and configuration macros</a></h3>
<ul>
<li><a href="user.h#realT">realT, qh_REAL...</a> size
of floating point numbers </li>
<li><a href="user.h#CPUclock">qh_CPUclock</a> clock()
function for reporting the total time spent by
Qhull </li>
<li><a href="user.h#RANDOM">qh_RANDOM...</a> random
number generator </li>
</ul>
<h3><a href="qh-user.htm#TOC">»</a><a name="udef">definition constants</a></h3>
<ul>
<li><a href="user.h#DEFAULTbox">qh_DEFAULTbox</a>
define default box size for rbox, 'Qbb', and 'QbB' (Geomview expects 0.5) </li>
<li><a href="user.h#INFINITE">qh_INFINITE</a> on
output, indicates Voronoi center at infinity </li>
<li><a href="user.h#ORIENTclock">qh_ORIENTclock</a>
define convention for orienting facets</li>
<li><a href="user.h#ZEROdelaunay">qh_ZEROdelaunay</a>
define facets that are ignored in Delaunay triangulations</li>
</ul>
<h3><a href="qh-user.htm#TOC">»</a><a name="ujoggle">joggle constants</a></h3>
<ul>
<li><a href="user.h#JOGGLEagain">qh_JOGGLEagain</a>
how often to retry before using qh_JOGGLEmaxincrease
again </li>
<li><a href="user.h#JOGGLEdefault">qh_JOGGLEdefault</a>
default value for qh.JOGGLEmax for 'QP' </li>
<li><a href="user.h#JOGGLEincrease">qh_JOGGLEincrease</a>
factor to increase qh.JOGGLEmax on retrys for
'QPn' </li>
<li><a href="user.h#JOGGLEmaxincrease">qh_JOGGLEmaxincrease</a> max
for increasing qh.JOGGLEmax relative to
qh.MAXwidth </li>
<li><a href="user.h#JOGGLEretry">qh_JOGGLEmaxretry</a>
report error if this many retries </li>
<li><a href="user.h#JOGGLEretry">qh_JOGGLEretry</a>
how often to retry before using qh_JOGGLEmax </li>
</ul>
<h3><a href="qh-user.htm#TOC">»</a><a name="uperform">performance
related constants</a></h3>
<ul>
<li><a href="user.h#HASHfactor">qh_HASHfactor</a>
total/used hash slots </li>
<li><a href="user.h#INITIALmax">qh_INITIALmax</a> if
dim >= qh_INITIALmax, use min/max coordinate
points for initial simplex </li>
<li><a href="user.h#INITIALsearch">qh_INITIALsearch</a>
if qh.INITIALmax, search points up to this
dimension </li>
<li><a href="user.h#NOtrace">qh_NOtrace</a> disallow
tracing </li>
<li><a href="user.h#VERIFYdirect">qh_VERIFYdirect</a>
'Tv' verifies all <em>points X facets</em> if op
count is smaller </li>
</ul>
<h3><a href="qh-user.htm#TOC">»</a><a name="umemory">memory constants</a></h3>
<ul>
<li><a href="user.h#MEMalign">qh_MEMalign</a> memory
alignment for qh_meminitbuffers() in global.c </li>
<li><a href="user.h#MEMbufsize">qh_MEMbufsize</a>
size of additional memory buffers </li>
<li><a href="user.h#MEMinitbuf">qh_MEMinitbuf</a>
size of initial memory buffer </li>
</ul>
<h3><a href="qh-user.htm#TOC">»</a><a name="ucond">conditional compilation</a></h3>
<ul>
<li><a href="user.h#compiler">compiler</a> defined symbols,
e.g., _STDC_ and _cplusplus
<li><a href="user.h#COMPUTEfurthest">qh_COMPUTEfurthest</a>
compute furthest distance to an outside point instead of storing it with the facet
<li><a href="user.h#KEEPstatistics">qh_KEEPstatistics</a>
enable statistic gathering and reporting with option 'Ts'
<li><a href="user.h#MAXoutside">qh_MAXoutside</a>
record outer plane for each facet
<li><a href="user.h#NOmerge">qh_NOmerge</a>
disable facet merging
<li><a href="user.h#NOtrace">qh_NOtrace</a>
disable tracing with option 'T4'
<li><a href="user.h#QHpointer">qh_QHpointer</a>
access global data with pointer or static structure
<li><a href="user.h#QUICKhelp">qh_QUICKhelp</a>
use abbreviated help messages, e.g., for degenerate inputs
</ul>
<h3><a href="qh-user.htm#TOC">»</a><a name="umerge">merge
constants</a></h3>
<ul>
<li><a href="user.h#BESTcentrum">qh_BESTcentrum</a>
when does qh_findbestneighbor() test centrums? </li>
<li><a href="user.h#BESTnonconvex">qh_BESTnonconvex</a>
when does qh_findbestneighbor() test nonconvex
ridges only? </li>
<li><a href="user.h#COPLANARratio">qh_COPLANARratio</a>
what is qh.MINvisible? </li>
<li><a href="user.h#DIMreduceBuild">qh_DIMreduceBuild</a>
max dimension for vertex reduction </li>
<li><a href="user.h#DIMmergeVertex">qh_DIMmergeVertex</a>
max dimension for vertex merging </li>
<li><a href="user.h#DISToutside">qh_DISToutside</a>
when is a point clearly outside of a facet for qh_findbestnew and qh_partitionall</li>
<li><a href="user.h#MAXnarrow">qh_MAXnarrow</a> max.
cosine for qh.NARROWhull </li>
<li><a href="user.h#MAXnewcentrum">qh_MAXnewcentrum</a>
when does qh_reducevertices_centrum() reset the
centrum? </li>
<li><a href="user.h#MAXnewmerges">qh_MAXnewmerges</a>
when does qh_merge_nonconvex() call
qh_reducevertices_centrums? </li>
<li><a href="user.h#RATIOnearinside">qh_RATIOnearinside</a>
ratio for retaining inside points for
qh_check_maxout() </li>
<li><a href="user.h#SEARCHdist">qh_SEARCHdist</a>
when is facet coplanar with the best facet for qh_findbesthorizon</li>
<li><a href="user.h#USEfindbestnew">qh_USEfindbestnew</a>
when to use qh_findbestnew for qh_partitionpoint()</li>
<li><a href="user.h#WIDEcoplanar">qh_WIDEcoplanar</a>
what is a WIDEfacet? </li>
<li><a href="user.h#WARNnarrow">qh_WARNnarrow</a>
max. cosine to warn about qh.NARROWhull </li>
</ul>
<h3><a href="qh-user.htm#TOC">»</a><a name="ufunc">user.c
functions</a></h3>
<ul>
<li><a href="user.c#errexit">qh_errexit</a> report
error and exit qhull()</li>
<li><a href="user.c#errprint">qh_errprint</a> print
information about facets and ridges </li>
<li><a href="user.c#new_qhull">qh_new_qhull</a> call qhull on an array
of points</li>
<li><a href="user.c#printfacetlist">qh_printfacetlist</a>
print all fields of all facets </li>
</ul>
<h3><a href="qh-user.htm#TOC">»</a><a name="u2func">usermem.c
functions</a></h3>
<ul>
<li><a href="usermem.c#qh_exit">qh_exit</a> exit program, same as exit().</li>
<li><a href="usermem.c#qh_free">qh_free</a> free memory, same as free().</li>
<li><a href="usermem.c#qh_malloc">qh_malloc</a> allocate memory, same as malloc()</li>
</ul>
<h3><a href="qh-user.htm#TOC">»</a><a name="u3func">userprintf.c
and userprintf_rbox,c functions</a></h3>
<ul>
<li><a href="userprintf.c#qh_fprintf">qh_fprintf</a> print
information from Qhull, sames as fprintf(). </li>
<li><a href="userprintf_rbox.c#qh_fprintf_rbox">qh_fprintf_rbox</a> print
information from Rbox, sames as fprintf(). </li>
</ul>
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