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/****************************************************************
*
* MODULE: v.net.path
*
* AUTHOR(S): Radim Blazek
*
* PURPOSE: Shortest path on vector network
*
* COPYRIGHT: (C) 2002 by the GRASS Development Team
*
* This program is free software under the
* GNU General Public License (>=v2).
* Read the file COPYING that comes with GRASS
* for details.
*
****************************************************************/
#include <stdlib.h>
#include "gis.h"
#include "Vect.h"
int path ( struct Map_info *, struct Map_info *, int, double, int );
int main(int argc, char **argv)
{
struct Option *input_opt, *output_opt, *afield_opt, *nfield_opt, *afcol, *abcol, *ncol, *type_opt;
struct Option *max_dist;
struct Flag *geo_f, *segments_f;
struct GModule *module;
char *mapset;
struct Map_info In, Out;
int type, afield, nfield, geo;
double maxdist;
/* Initialize the GIS calls */
G_gisinit (argv[0]) ;
module = G_define_module();
module->description = "Find shortest path on vector network. Reads start/end points"
"from standard input in 2 possible formats:\n"
"id start_point_category end_point_category\n"
"id start_point_x start_point_y end_point_x end_point_y\n"
"Points specified by category must be exactly on network nodes.";
input_opt = G_define_standard_option(G_OPT_V_INPUT);
output_opt = G_define_standard_option(G_OPT_V_OUTPUT);
type_opt = G_define_standard_option(G_OPT_V_TYPE);
type_opt->options = "line,boundary";
type_opt->answer = "line,boundary";
type_opt->description = "Arc type";
afield_opt = G_define_standard_option(G_OPT_V_FIELD);
afield_opt->key = "alayer";
afield_opt->answer = "1";
afield_opt->description = "Arc layer";
nfield_opt = G_define_standard_option(G_OPT_V_FIELD);
nfield_opt->key = "nlayer";
nfield_opt->answer = "2";
nfield_opt->description = "Node layer";
afcol = G_define_option() ;
afcol->key = "afcolumn" ;
afcol->type = TYPE_STRING ;
afcol->required = NO ;
afcol->description = "Arc forward/both direction(s) cost column" ;
abcol = G_define_option() ;
abcol->key = "abcolumn" ;
abcol->type = TYPE_STRING ;
abcol->required = NO ;
abcol->description = "Arc backward direction cost column" ;
ncol = G_define_option() ;
ncol->key = "ncolumn" ;
ncol->type = TYPE_STRING ;
ncol->required = NO ;
ncol->description = "Node cost column" ;
max_dist = G_define_option() ;
max_dist->key = "dmax";
max_dist->type = TYPE_DOUBLE;
max_dist->required = NO;
max_dist->answer = "1000";
max_dist->description = "Maximum distance to the network if start/end are given as coordinates. "
"If start/end point is outside this threshold, the path is not found "
"and error message is printed. To speed up the process, keep this "
"value as low as possible.";
geo_f = G_define_flag ();
geo_f->key = 'g';
geo_f->description = "Use geodesic calculation for longitude-latitude locations";
segments_f = G_define_flag ();
segments_f->key = 's';
segments_f->description = "Write output as original input segments, not each path as one line.";
if(G_parser(argc,argv))
exit(-1);
type = Vect_option_to_types ( type_opt );
afield = atoi (afield_opt->answer);
nfield = atoi (nfield_opt->answer);
maxdist = atof ( max_dist->answer );
if ( geo_f->answer ) {
geo = 1;
if (G_projection () != PROJECTION_LL)
G_warning("The current projection is not longitude-latitude");
}
else geo = 0;
Vect_check_input_output_name ( input_opt->answer, output_opt->answer, GV_FATAL_EXIT );
mapset = G_find_vector2 (input_opt->answer, NULL);
if ( mapset == NULL)
G_fatal_error ("Could not find input vector '%s'\n", input_opt->answer);
Vect_set_open_level(2);
Vect_open_old (&In, input_opt->answer, mapset);
Vect_set_fatal_error (GV_FATAL_PRINT);
if (1 > Vect_open_new (&Out, output_opt->answer, Vect_is_3d(&In) )){
Vect_close (&In);
G_fatal_error ("Failed opening output vector file");
}
Vect_hist_command ( &Out );
Vect_net_build_graph ( &In, type, afield, nfield, afcol->answer, abcol->answer,
ncol->answer, geo, 0 );
path ( &In, &Out, nfield, maxdist, segments_f->answer );
Vect_close(&In);
Vect_build (&Out, stdout);
Vect_close(&Out);
exit(0);
}
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