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/*<html><pre> -<a href="qh-user.htm"
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>-------------------------------</a><a name="TOP">-</a>
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user redefinable functions
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see README.txt see COPYING.txt for copyright information.
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see qhull.h for data structures, macros, and user-callable functions.
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see user_eg.c, unix.c, and qhull_interface.cpp for examples.
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see user.h for user-definable constants
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use qh_NOmem in mem.h to turn off memory management
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use qh_NOmerge in user.h to turn off facet merging
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set qh_KEEPstatistics in user.h to 0 to turn off statistics
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This is unsupported software. You're welcome to make changes,
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but you're on your own if something goes wrong. Use 'Tc' to
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check frequently. Usually qhull will report an error if
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a data structure becomes inconsistent. If so, it also reports
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the last point added to the hull, e.g., 102. You can then trace
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the execution of qhull with "T4P102".
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Please report any errors that you fix to qhull@qhull.org
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call_qhull is a template for calling qhull from within your application
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if you recompile and load this module, then user.o will not be loaded
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you can add additional quick allocation sizes in qh_user_memsizes
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if the other functions here are redefined to not use qh_print...,
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then io.o will not be loaded from qhull.a. See user_eg.c for an
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example. We recommend keeping io.o for the extra debugging
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information it supplies.
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/*-<a href="qh-user.htm#TOC"
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>-------------------------------</a><a name="call_qhull">-</a>
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template for calling qhull from inside your program
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remove #if 0, #endif to compile
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exit code (see qh_ERR... in qhull.h)
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This can be called any number of times.
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int dim; /* dimension of points */
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int numpoints; /* number of points */
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coordT *points; /* array of coordinates for each point */
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boolT ismalloc; /* True if qhull should free points in qh_freeqhull() or reallocation */
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char flags[]= "qhull Tv"; /* option flags for qhull, see qh_opt.htm */
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FILE *outfile= stdout; /* output from qh_produce_output()
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use NULL to skip qh_produce_output() */
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FILE *errfile= stderr; /* error messages from qhull code */
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int exitcode; /* 0 if no error from qhull */
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facetT *facet; /* set by FORALLfacets */
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int curlong, totlong; /* memory remaining after qh_memfreeshort */
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/* initialize dim, numpoints, points[], ismalloc here */
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exitcode= qh_new_qhull (dim, numpoints, points, ismalloc,
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flags, outfile, errfile);
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if (!exitcode) { /* if no error */
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/* 'qh facet_list' contains the convex hull */
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/* ... your code ... */
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qh_freeqhull(!qh_ALL);
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qh_memfreeshort (&curlong, &totlong);
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if (curlong || totlong)
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fprintf (errfile, "qhull internal warning (main): did not free %d bytes of long memory (%d pieces)\n", totlong, curlong);
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/*-<a href="qh-user.htm#TOC"
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>-------------------------------</a><a name="new_qhull">-</a>
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qh_new_qhull( dim, numpoints, points, ismalloc, qhull_cmd, outfile, errfile )
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build new qhull data structure and return exitcode (0 if no errors)
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do not modify points until finished with results.
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The qhull data structure contains pointers into the points array.
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do not call qhull functions before qh_new_qhull().
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The qhull data structure is not initialized until qh_new_qhull().
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qhull_cmd must start with "qhull "
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projects points to a new point array for Delaunay triangulations ('d' and 'v')
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transforms points into a new point array for halfspace intersection ('H')
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To allow multiple, concurrent calls to qhull()
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- set qh_QHpointer in user.h
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- use qh_save_qhull and qh_restore_qhull to swap the global data structure between calls.
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- use qh_freeqhull(qh_ALL) to free intermediate convex hulls
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user_eg.c for an example
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int qh_new_qhull (int dim, int numpoints, coordT *points, boolT ismalloc,
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char *qhull_cmd, FILE *outfile, FILE *errfile) {
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int exitcode, hulldim;
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static boolT firstcall = True;
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qh_meminit (errfile);
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if (strncmp (qhull_cmd,"qhull ", 6)) {
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fprintf (errfile, "qh_new_qhull: start qhull_cmd argument with \"qhull \"\n");
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qh_initqhull_start (NULL, outfile, errfile);
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trace1(( qh ferr, "qh_new_qhull: build new Qhull for %d %d-d points with %s\n", numpoints, dim, qhull_cmd));
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exitcode = setjmp (qh errexit);
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qh NOerrexit = False;
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qh_initflags (qhull_cmd);
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qh PROJECTdelaunay= True;
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/* points is an array of halfspaces,
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the last coordinate of each halfspace is its offset */
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qh_setfeasible (hulldim);
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new_points= qh_sethalfspace_all (dim, numpoints, points, qh feasible_point);
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new_ismalloc= ismalloc;
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qh_init_B (new_points, numpoints, hulldim, new_ismalloc);
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if (qh VERIFYoutput && !qh STOPpoint && !qh STOPcone)
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/*-<a href="qh-user.htm#TOC"
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>-------------------------------</a><a name="errexit">-</a>
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qh_errexit( exitcode, facet, ridge )
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report and exit from an error
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report facet and ridge if non-NULL
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reports useful information such as last point processed
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set qh.FORCEoutput to print neighborhood of facet
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qh_errexit2() in qhull.c for printing 2 facets
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check for error within error processing
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print facet and ridge (if any)
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report commandString, options, qh.furthest_id
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print summary and statistics (including precision statistics)
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print help text for singular data set
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exit program via long jump (if defined) or exit()
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void qh_errexit(int exitcode, facetT *facet, ridgeT *ridge) {
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if (qh ERREXITcalled) {
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fprintf (qh ferr, "\nqhull error while processing previous error. Exit program\n");
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qh ERREXITcalled= True;
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if (!qh QHULLfinished)
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qh hulltime= qh_CPUclock - qh hulltime;
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qh_errprint("ERRONEOUS", facet, NULL, ridge, NULL);
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fprintf (qh ferr, "\nWhile executing: %s | %s\n", qh rbox_command, qh qhull_command);
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fprintf(qh ferr, "Options selected for Qhull %s:\n%s\n", qh_version, qh qhull_options);
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if (qh furthest_id >= 0) {
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fprintf(qh ferr, "Last point added to hull was p%d.", qh furthest_id);
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if (zzval_(Ztotmerge))
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fprintf(qh ferr, " Last merge was #%d.", zzval_(Ztotmerge));
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if (qh QHULLfinished)
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fprintf(qh ferr, "\nQhull has finished constructing the hull.");
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else if (qh POSTmerging)
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fprintf(qh ferr, "\nQhull has started post-merging.");
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fprintf (qh ferr, "\n");
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if (qh FORCEoutput && (qh QHULLfinished || (!facet && !ridge)))
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if (exitcode != qh_ERRsingular && zzval_(Zsetplane) > qh hull_dim+1) {
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fprintf (qh ferr, "\nAt error exit:\n");
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qh_printsummary (qh ferr);
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if (qh PRINTstatistics) {
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qh_collectstatistics();
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qh_printstatistics(qh ferr, "at error exit");
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qh_memstatistics (qh ferr);
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if (qh PRINTprecision)
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qh_printstats (qh ferr, qhstat precision, NULL);
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exitcode= qh_ERRqhull;
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else if (exitcode == qh_ERRsingular)
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qh_printhelp_singular(qh ferr);
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else if (exitcode == qh_ERRprec && !qh PREmerge)
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qh_printhelp_degenerate (qh ferr);
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fprintf (qh ferr, "qhull error while ending program. Exit program\n");
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longjmp(qh errexit, exitcode);
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/*-<a href="qh-user.htm#TOC"
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>-------------------------------</a><a name="errprint">-</a>
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qh_errprint( fp, string, atfacet, otherfacet, atridge, atvertex )
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prints out the information of facets and ridges to fp
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also prints neighbors and geomview output
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except for string, any parameter may be NULL
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void qh_errprint(char *string, facetT *atfacet, facetT *otherfacet, ridgeT *atridge, vertexT *atvertex) {
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fprintf(qh ferr, "%s FACET:\n", string);
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qh_printfacet(qh ferr, atfacet);
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fprintf(qh ferr, "%s OTHER FACET:\n", string);
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qh_printfacet(qh ferr, otherfacet);
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fprintf(qh ferr, "%s RIDGE:\n", string);
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qh_printridge(qh ferr, atridge);
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if (atridge->top && atridge->top != atfacet && atridge->top != otherfacet)
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qh_printfacet(qh ferr, atridge->top);
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&& atridge->bottom != atfacet && atridge->bottom != otherfacet)
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qh_printfacet(qh ferr, atridge->bottom);
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atfacet= atridge->top;
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otherfacet= otherfacet_(atridge, atfacet);
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fprintf(qh ferr, "%s VERTEX:\n", string);
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qh_printvertex (qh ferr, atvertex);
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if (qh fout && qh FORCEoutput && atfacet && !qh QHULLfinished && !qh IStracing) {
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fprintf(qh ferr, "ERRONEOUS and NEIGHBORING FACETS to output\n");
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for (i= 0; i < qh_PRINTEND; i++) /* use fout for geomview output */
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qh_printneighborhood (qh fout, qh PRINTout[i], atfacet, otherfacet,
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/*-<a href="qh-user.htm#TOC"
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>-------------------------------</a><a name="printfacetlist">-</a>
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qh_printfacetlist( fp, facetlist, facets, printall )
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print all fields for a facet list and/or set of facets to fp
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only prints good facets
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also prints all vertices
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void qh_printfacetlist(facetT *facetlist, setT *facets, boolT printall) {
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facetT *facet, **facetp;
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qh_printbegin (qh ferr, qh_PRINTfacets, facetlist, facets, printall);
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FORALLfacet_(facetlist)
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qh_printafacet(qh ferr, qh_PRINTfacets, facet, printall);
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FOREACHfacet_(facets)
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qh_printafacet(qh ferr, qh_PRINTfacets, facet, printall);
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qh_printend (qh ferr, qh_PRINTfacets, facetlist, facets, printall);
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} /* printfacetlist */
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/*-<a href="qh-globa.htm#TOC"
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>-------------------------------</a><a name="user_memsizes">-</a>
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allocate up to 10 additional, quick allocation sizes
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increase maximum number of allocations in qh_initqhull_mem()
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void qh_user_memsizes (void) {
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/* qh_memsize (size); */
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} /* user_memsizes */
added
removed
src/user.c
