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/*
* Based on:
* s.rand
* Copyright (C) 1993-1995. James Darrell McCauley.
*
* Author: James Darrell McCauley darrell@mccauley-usa.com
* http://mccauley-usa.com/
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Modification History:
*
* $Id: main.c,v 1.6 2004/12/15 17:41:40 radim Exp $
*
* s.rand v 0.5B <25 Jun 1995> Copyright (c) 1993-1995. James Darrell McCauley
* <?? ??? 1993> - began coding and released test version (jdm)
* <10 Jan 1994> - changed RAND_MAX for rand(), since it is different for
* SunOS 4.1.x and Solaris 2.3. stdlib.h in the latter defines
* RAND_MAX, but it doesn't in the former. v0.2B (jdm)
* <02 Jan 1995> - clean Gmakefile, man page. added html v0.3B (jdm)
* <25 Feb 1995> - cleaned 'gcc -Wall' warnings (jdm)
* <25 Jun 1995> - new site API (jdm)
* <13 Sep 2000> - released under GPL
*/
#include <stdlib.h>
#include <math.h>
#include <sys/types.h>
#include <unistd.h>
#include <string.h>
#include "gis.h"
#include "Vect.h"
#ifndef RAND_MAX
#define RAND_MAX (pow(2.0,31.0)-1)
#endif
double myrand(void);
#if defined(__CYGWIN__) || defined(__APPLE__)
double drand48()
{
return(rand()/32767.0);
}
#define srand48(sv) (srand((unsigned)(sv)))
#endif
int main (int argc, char *argv[])
{
char *output;
double (*rng) (), max;
int i, n, b;
struct Map_info Out;
struct line_pnts *Points;
struct line_cats *Cats;
struct Cell_head window;
struct GModule *module;
struct
{
struct Option *output, *nsites;
} parm;
struct
{
struct Flag *rand, *drand48;
} flag;
G_gisinit (argv[0]);
module = G_define_module();
module->description =
"Randomly generate a GRASS vector points map.";
parm.output = G_define_option ();
parm.output->key = "output";
parm.output->type = TYPE_STRING;
parm.output->required = YES;
parm.output->description = "vector file to be created";
parm.output->gisprompt = "new,vector,vector";
parm.nsites = G_define_option ();
parm.nsites->key = "n";
parm.nsites->type = TYPE_INTEGER;
parm.nsites->required = YES;
parm.nsites->description = "number of points to be created";
flag.drand48 = G_define_flag ();
flag.drand48->key = 'd';
flag.drand48->description = "Use drand48() function (default=rand() )";
if (G_parser (argc, argv))
exit (1);
output = parm.output->answer;
n = atoi(parm.nsites->answer);
b = (flag.drand48->answer == '\0') ? 0 : 1;
if (n <= 0) {
G_fatal_error ( "%s given an illegal number of sites [%d]", G_program_name (), n);
}
Vect_open_new (&Out, output, 0);
Vect_hist_command ( &Out );
if (b)
{
rng=drand48;
max=1.0;
srand48 ((long)getpid ());
}
else /* default is rand() */
{
rng=myrand;
max=RAND_MAX;
srand (getpid ());
}
G_get_window (&window);
Points = Vect_new_line_struct ();
Cats = Vect_new_cats_struct ();
for(i=0; i<n; ++i)
{
double x, y;
Vect_reset_line ( Points );
Vect_reset_cats ( Cats );
x = rng()/max*(window.west-window.east)+window.east;
y = rng()/max*(window.north-window.south)+window.south;
Vect_append_point ( Points, x, y, 0.0 );
Vect_cat_set (Cats, 1, i+1);
Vect_write_line ( &Out, GV_POINT, Points, Cats );
}
Vect_build (&Out, stderr);
Vect_close (&Out);
return (0);
}
double myrand()
{
return (double) rand();
}
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