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unix.c
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/*<html><pre> -<a href="qh-qhull.htm"
>-------------------------------</a><a name="TOP">-</a>
unix.c
command line interface to qhull
includes SIOUX interface for Macintoshes
see qh-qhull.htm
copyright (c) 1993-2002, The Geometry Center
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <math.h>
#include "qhull.h"
#include "mem.h"
#include "qset.h"
#if __MWERKS__ && __POWERPC__
#include <SIOUX.h>
#include <Files.h>
#include <console.h>
#include <Desk.h>
#elif __cplusplus
extern "C" {
int isatty (int);
}
#elif _MSC_VER
#include <io.h>
#define isatty _isatty
#else
int isatty (int); /* returns 1 if stdin is a tty
if "Undefined symbol" this can be deleted along with call in main() */
#endif
/*-<a href="qh-qhull.htm#TOC"
>-------------------------------</a><a name="prompt">-</a>
qh_prompt
long prompt for qhull
see:
concise prompt below
*/
char qh_prompta[]= "\n\
qhull- compute convex hulls and related structures.\n\
http://www.geom.umn.edu/software/qhull %s\n\
\n\
input (stdin):\n\
first lines: dimension and number of points (or vice-versa).\n\
other lines: point coordinates, best if one point per line\n\
comments: start with a non-numeric character\n\
halfspaces: use dim plus one and put offset after coefficients.\n\
May be preceeded by a single interior point ('H').\n\
\n\
options:\n\
d - Delaunay triangulation by lifting points to a paraboloid\n\
d Qu - furthest-site Delaunay triangulation (upper convex hull)\n\
v - Voronoi diagram (dual of the Delaunay triangulation)\n\
v Qu - furthest-site Voronoi diagram\n\
Hn,n,... - halfspace intersection about point [n,n,0,...]\n\
Qt - triangulated output\n\
QJ - joggled input instead of merged facets\n\
Qc - keep coplanar points with nearest facet\n\
Qi - keep interior points with nearest facet\n\
\n\
Qhull control options:\n\
Qbk:n - scale coord k so that low bound is n\n\
QBk:n - scale coord k so that upper bound is n (QBk is %2.2g)\n\
QbB - scale input to unit cube centered at the origin\n\
Qbb - scale last coordinate to [0,m] for Delaunay triangulations\n\
Qbk:0Bk:0 - remove k-th coordinate from input\n\
QJn - randomly joggle input in range [-n,n]\n\
QRn - random rotation (n=seed, n=0 time, n=-1 time/no rotate)\n\
%s%s%s%s"; /* split up qh_prompt for Visual C++ */
char qh_promptb[]= "\
Qf - partition point to furthest outside facet\n\
Qg - only build good facets (needs 'QGn', 'QVn', or 'PdD')\n\
Qm - only process points that would increase max_outside\n\
Qr - process random outside points instead of furthest ones\n\
Qs - search all points for the initial simplex\n\
Qu - for 'd' or 'v', compute upper hull without point at-infinity\n\
returns furthest-site Delaunay triangulation\n\
Qv - test vertex neighbors for convexity\n\
Qx - exact pre-merges (skips coplanar and angle-coplanar facets)\n\
Qz - add point-at-infinity to Delaunay triangulation\n\
QGn - good facet if visible from point n, -n for not visible\n\
QVn - good facet if it includes point n, -n if not\n\
Q0 - turn off default premerge with 'C-0'/'Qx'\n\
Q1 - sort merges by type instead of angle\n\
Q2 - merge all non-convex at once instead of independent sets\n\
Q3 - do not merge redundant vertices\n\
Q4 - avoid old->new merges\n\
Q5 - do not correct outer planes at end of qhull\n\
Q6 - do not pre-merge concave or coplanar facets\n\
Q7 - depth-first processing instead of breadth-first\n\
Q8 - do not process near-inside points\n\
Q9 - process furthest of furthest points\n\
Q10 - no special processing for narrow distributions\n\
Q11 - copy normals and recompute centrums for tricoplanar facets\n\
\n\
";
char qh_promptc[]= "\
Topts- Trace options:\n\
T4 - trace at level n, 4=all, 5=mem/gauss, -1= events\n\
Tc - check frequently during execution\n\
Ts - print statistics\n\
Tv - verify result: structure, convexity, and point inclusion\n\
Tz - send all output to stdout\n\
TFn - report summary when n or more facets created\n\
TI file - input data from file, no spaces or single quotes\n\
TO file - output results to file, may be enclosed in single quotes\n\
TPn - turn on tracing when point n added to hull\n\
TMn - turn on tracing at merge n\n\
TWn - trace merge facets when width > n\n\
TRn - rerun qhull n times. Use with 'QJn'\n\
TVn - stop qhull after adding point n, -n for before (see TCn)\n\
TCn - stop qhull after building cone for point n (see TVn)\n\
\n\
Precision options:\n\
Cn - radius of centrum (roundoff added). Merge facets if non-convex\n\
An - cosine of maximum angle. Merge facets if cosine > n or non-convex\n\
C-0 roundoff, A-0.99/C-0.01 pre-merge, A0.99/C0.01 post-merge\n\
En - max roundoff error for distance computation\n\
Rn - randomly perturb computations by a factor of [1-n,1+n]\n\
Vn - min distance above plane for a visible facet (default 3C-n or En)\n\
Un - max distance below plane for a new, coplanar point (default Vn)\n\
Wn - min facet width for outside point (before roundoff, default 2Vn)\n\
\n\
Output formats (may be combined; if none, produces a summary to stdout):\n\
f - facet dump\n\
G - Geomview output (see below)\n\
i - vertices incident to each facet\n\
m - Mathematica output (2-d and 3-d)\n\
o - OFF format (dim, points and facets; Voronoi regions)\n\
n - normals with offsets\n\
p - vertex coordinates or Voronoi vertices (coplanar points if 'Qc')\n\
s - summary (stderr)\n\
\n\
";
char qh_promptd[]= "\
More formats:\n\
Fa - area for each facet\n\
FA - compute total area and volume for option 's'\n\
Fc - count plus coplanar points for each facet\n\
use 'Qc' (default) for coplanar and 'Qi' for interior\n\
FC - centrum or Voronoi center for each facet\n\
Fd - use cdd format for input (homogeneous with offset first)\n\
FD - use cdd format for numeric output (offset first)\n\
FF - facet dump without ridges\n\
Fi - inner plane for each facet\n\
for 'v', separating hyperplanes for bounded Voronoi regions\n\
FI - ID of each facet\n\
Fm - merge count for each facet (511 max)\n\
Fn - count plus neighboring facets for each facet\n\
FN - count plus neighboring facets for each point\n\
Fo - outer plane (or max_outside) for each facet\n\
for 'v', separating hyperplanes for unbounded Voronoi regions\n\
FO - options and precision constants\n\
Fp - dim, count, and intersection coordinates (halfspace only)\n\
FP - nearest vertex and distance for each coplanar point\n\
FQ - command used for qhull\n\
Fs - summary: #int (8), dimension, #points, tot vertices, tot facets,\n\
output: #vertices, #facets, #coplanars, #nonsimplicial\n\
#real (2), max outer plane, min vertex\n\
FS - sizes: #int (0)\n\
#real(2) tot area, tot volume\n\
Ft - triangulation with centrums for non-simplicial facets (OFF format)\n\
Fv - count plus vertices for each facet\n\
for 'v', Voronoi diagram as Voronoi vertices for pairs of sites\n\
FV - average of vertices (a feasible point for 'H')\n\
Fx - extreme points (in order for 2-d)\n\
\n\
";
char qh_prompte[]= "\
Geomview options (2-d, 3-d, and 4-d; 2-d Voronoi)\n\
Ga - all points as dots\n\
Gp - coplanar points and vertices as radii\n\
Gv - vertices as spheres\n\
Gi - inner planes only\n\
Gn - no planes\n\
Go - outer planes only\n\
Gc - centrums\n\
Gh - hyperplane intersections\n\
Gr - ridges\n\
GDn - drop dimension n in 3-d and 4-d output\n\
Gt - for 3-d 'd', transparent outer ridges\n\
\n\
Print options:\n\
PAn - keep n largest facets by area\n\
Pdk:n - drop facet if normal[k] <= n (default 0.0)\n\
PDk:n - drop facet if normal[k] >= n\n\
Pg - print good facets (needs 'QGn' or 'QVn')\n\
PFn - keep facets whose area is at least n\n\
PG - print neighbors of good facets\n\
PMn - keep n facets with most merges\n\
Po - force output. If error, output neighborhood of facet\n\
Pp - do not report precision problems\n\
\n\
. - list of all options\n\
- - one line descriptions of all options\n\
";
/* for opts, don't assign 'e' or 'E' to a flag (already used for exponent) */
/*-<a href="qh-qhull.htm#TOC"
>-------------------------------</a><a name="prompt2">-</a>
qh_prompt2
synopsis for qhull
*/
char qh_prompt2[]= "\n\
qhull- compute convex hulls and related structures. %s\n\
input (stdin): dimension, n, point coordinates\n\
comments start with a non-numeric character\n\
halfspace: use dim+1 and put offsets after coefficients\n\
\n\
options (qh-quick.htm):\n\
d - Delaunay triangulation by lifting points to a paraboloid\n\
d Qu - furthest-site Delaunay triangulation (upper convex hull)\n\
v - Voronoi diagram as the dual of the Delaunay triangulation\n\
v Qu - furthest-site Voronoi diagram\n\
H1,1 - Halfspace intersection about [1,1,0,...] via polar duality\n\
Qt - triangulated output\n\
QJ - joggled input instead of merged facets\n\
Tv - verify result: structure, convexity, and point inclusion\n\
. - concise list of all options\n\
- - one-line description of all options\n\
\n\
Output options (subset):\n\
s - summary of results (default)\n\
i - vertices incident to each facet\n\
n - normals with offsets\n\
p - vertex coordinates (if 'Qc', includes coplanar points)\n\
if 'v', Voronoi vertices\n\
Fp - halfspace intersections\n\
Fx - extreme points (convex hull vertices)\n\
FA - compute total area and volume\n\
o - OFF format (if 'v', outputs Voronoi regions)\n\
G - Geomview output (2-d, 3-d and 4-d)\n\
m - Mathematica output (2-d and 3-d)\n\
QVn - print facets that include point n, -n if not\n\
TO file- output results to file, may be enclosed in single quotes\n\
\n\
examples:\n\
rbox c d D2 | qhull Qc s f Fx | more rbox 1000 s | qhull Tv s FA\n\
rbox 10 D2 | qhull d QJ s i TO result rbox 10 D2 | qhull v QJ p\n\
rbox 10 D2 | qhull d Qu QJ m rbox 10 D2 | qhull v Qu QJ o\n\
rbox c | qhull n rbox c | qhull FV n | qhull H Fp\n\
rbox d D12 | qhull QR0 FA rbox c D7 | qhull FA TF1000\n\
rbox y 1000 W0 | qhull rbox 10 | qhull v QJ o Fv\n\
\n\
";
/* for opts, don't assign 'e' or 'E' to a flag (already used for exponent) */
/*-<a href="qh-qhull.htm#TOC"
>-------------------------------</a><a name="prompt3">-</a>
qh_prompt3
concise prompt for qhull
*/
char qh_prompt3[]= "\n\
Qhull %s.\n\
Except for 'F.' and 'PG', upper-case options take an argument.\n\
\n\
delaunay voronoi Geomview Halfspace facet_dump\n\
incidences mathematica normals OFF_format points\n\
summary\n\
\n\
Farea FArea-total Fcoplanars FCentrums Fd-cdd-in\n\
FD-cdd-out FF-dump-xridge Finner FIDs Fmerges\n\
Fneighbors FNeigh-vertex Fouter FOptions Fpoint-intersect\n\
FPoint_near FQhull Fsummary FSize Ftriangles\n\
Fvertices Fvoronoi FVertex-ave Fxtremes\n\
\n\
Gvertices Gpoints Gall_points Gno_planes Ginner\n\
Gcentrums Ghyperplanes Gridges Gouter GDrop_dim\n\
Gtransparent\n\
\n\
PArea-keep Pdrop d0:0D0 Pgood PFacet_area_keep\n\
PGood_neighbors PMerge-keep Poutput_forced Pprecision_not\n\
\n\
QbBound 0:0.5 Qbk:0Bk:0_drop QbB-scale-box Qbb-scale-last Qcoplanar\n\
Qfurthest Qgood_only QGood_point Qinterior Qmax_out\n\
QJoggle Qrandom QRotate Qsearch_1st Qtriangulate\n\
QupperDelaunay QVertex_good Qvneighbors Qxact_merge Qzinfinite\n\
\n\
Q0_no_premerge Q1_no_angle Q2_no_independ Q3_no_redundant Q4_no_old\n\
Q5_no_check_out Q6_no_concave Q7_depth_first Q8_no_near_in Q9_pick_furthest\n\
Q10_no_narrow Q11_trinormals\n\
\n\
T4_trace Tcheck_often Tstatistics Tverify Tz_stdout\n\
TFacet_log TInput_file TPoint_trace TMerge_trace TOutput_file\n\
TRerun TWide_trace TVertex_stop TCone_stop\n\
\n\
Angle_max Centrum_size Error_round Random_dist Visible_min\n\
Ucoplanar_max Wide_outside\n\
";
/*-<a href="qh-qhull.htm#TOC"
>-------------------------------</a><a name="main">-</a>
main( argc, argv )
processes the command line, calls qhull() to do the work, and exits
design:
initializes data structures
reads points
finishes initialization
computes convex hull and other structures
checks the result
writes the output
frees memory
*/
int main(int argc, char *argv[]) {
int curlong, totlong; /* used !qh_NOmem */
int exitcode, numpoints, dim;
coordT *points;
boolT ismalloc;
#if __MWERKS__ && __POWERPC__
char inBuf[BUFSIZ], outBuf[BUFSIZ], errBuf[BUFSIZ];
SIOUXSettings.showstatusline= false;
SIOUXSettings.tabspaces= 1;
SIOUXSettings.rows= 40;
if (setvbuf (stdin, inBuf, _IOFBF, sizeof(inBuf)) < 0 /* w/o, SIOUX I/O is slow*/
|| setvbuf (stdout, outBuf, _IOFBF, sizeof(outBuf)) < 0
|| (stdout != stderr && setvbuf (stderr, errBuf, _IOFBF, sizeof(errBuf)) < 0))
fprintf (stderr, "qhull internal warning (main): could not change stdio to fully buffered.\n");
argc= ccommand(&argv);
#endif
if ((argc == 1) && isatty( 0 /*stdin*/)) {
fprintf(stdout, qh_prompt2, qh_VERSION);
exit(qh_ERRnone);
}
if (argc > 1 && *argv[1] == '-' && !*(argv[1]+1)) {
fprintf(stdout, qh_prompta, qh_VERSION, qh_DEFAULTbox,
qh_promptb, qh_promptc, qh_promptd, qh_prompte);
exit(qh_ERRnone);
}
if (argc >1 && *argv[1] == '.' && !*(argv[1]+1)) {
fprintf(stdout, qh_prompt3, qh_VERSION);
exit(qh_ERRnone);
}
qh_init_A (stdin, stdout, stderr, argc, argv); /* sets qh qhull_command */
exitcode= setjmp (qh errexit); /* simple statement for CRAY J916 */
if (!exitcode) {
qh_initflags (qh qhull_command);
points= qh_readpoints (&numpoints, &dim, &ismalloc);
qh_init_B (points, numpoints, dim, ismalloc);
qh_qhull();
qh_check_output();
qh_produce_output();
if (qh VERIFYoutput && !qh FORCEoutput && !qh STOPpoint && !qh STOPcone)
qh_check_points();
exitcode= qh_ERRnone;
}
qh NOerrexit= True; /* no more setjmp */
#ifdef qh_NOmem
qh_freeqhull( True);
#else
qh_freeqhull( False);
qh_memfreeshort (&curlong, &totlong);
if (curlong || totlong)
fprintf (stderr, "qhull internal warning (main): did not free %d bytes of long memory (%d pieces)\n",
totlong, curlong);
#endif
return exitcode;
} /* main */

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