📄 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) 1993-2003, 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.qhull.org %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\
FM - Maple output (2-d and 3-d)\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\
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