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/***************************************************************
*
* MODULE: v.segment
*
* AUTHOR(S): Radim Blazek
*
* PURPOSE: Generate segments or points from input map and segments read from stdin
*
* 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 <string.h>
#include <time.h>
#include "gis.h"
#include "Vect.h"
#include "dbmi.h"
int find_line ( struct Map_info *Map, int lfield, int cat );
int main(int argc, char **argv)
{
int ret, points_written, lines_written, points_read, lines_read;
int lfield;
int line;
int id, lcat;
double offset1, offset2, side_offset;
double x, y, z, angle, len;
char stype;
struct Option *in_opt, *out_opt;
struct Option *lfield_opt;
struct GModule *module;
char *mapset, buf[2000];
struct Map_info In, Out;
struct line_cats *LCats, *SCats;
struct line_pnts *LPoints, *SPoints;
G_gisinit (argv[0]) ;
module = G_define_module();
module->description = "Create points/segments from input lines, "
"and positions read from stdin in format:\n"
"P <point id> <line cat> <offset> [<side offset>]\n"
"L <segment id> <line cat> <start offset> <end offset> [<side offset>]\n"
"Segment is created for the first found line of that category only.";
in_opt = G_define_standard_option(G_OPT_V_INPUT);
in_opt->description = "Input map containing lines";
out_opt = G_define_standard_option(G_OPT_V_OUTPUT);
out_opt->description = "Output map where segments will be written";
lfield_opt = G_define_standard_option(G_OPT_V_FIELD);
lfield_opt->key = "llayer";
lfield_opt->answer = "1";
lfield_opt->description = "Line layer";
if(G_parser(argc,argv)) exit(1);
LCats = Vect_new_cats_struct ();
SCats = Vect_new_cats_struct ();
LPoints = Vect_new_line_struct ();
SPoints = Vect_new_line_struct ();
lfield = atoi (lfield_opt->answer);
Vect_check_input_output_name ( in_opt->answer, out_opt->answer, GV_FATAL_EXIT );
/* Open input lines */
mapset = G_find_vector2 (in_opt->answer, NULL);
if(mapset == NULL) G_fatal_error ("Could not find input %s\n", in_opt->answer);
Vect_set_open_level ( 2 );
Vect_open_old (&In, in_opt->answer, mapset);
/* Open output segments */
Vect_open_new ( &Out, out_opt->answer, Vect_is_3d (&In) );
Vect_hist_copy (&In, &Out);
Vect_hist_command ( &Out );
points_read = 0; lines_read = 0;
points_written = 0; lines_written = 0;
while ( fgets (buf, sizeof(buf), stdin) != NULL ) {
G_debug ( 2, "SEGMENT: %s", G_chop(buf));
side_offset = 0;
Vect_reset_line ( SPoints );
Vect_reset_cats ( SCats );
switch ( buf[0] ) {
case 'P':
side_offset = 0;
ret = sscanf ( buf, "%c %d %d %lf %lf", &stype, &id, &lcat, &offset1, &side_offset);
if ( ret < 4 ) {
G_warning ( "Cannot read input: %s", buf);
break;
}
points_read++;
G_debug (2, "point: %d %d %f %f", id, lcat, offset1, side_offset);
/* OK, write point */
line = find_line ( &In, lfield, lcat );
if ( line == 0 ) {
G_warning ( "Cannot find line of cat %d", lcat);
break;
}
Vect_read_line ( &In, LPoints, LCats, line );
ret = Vect_point_on_line ( LPoints, offset1, &x, &y, &z, &angle, NULL);
if ( ret == 0 ) {
len = Vect_line_length ( LPoints );
G_warning ( "Cannot get point on line: cat = %d offset = %f (line length = %f)\n%s",
lcat, offset1, len, buf);
break;
}
Vect_append_point ( SPoints, x, y, z );
Vect_cat_set ( SCats, 1, id );
Vect_write_line ( &Out, GV_POINT, SPoints, SCats);
points_written++;
break;
case 'L':
side_offset = 0;
ret = sscanf ( buf, "%c %d %d %lf %lf %lf", &stype, &id, &lcat,
&offset1, &offset2, &side_offset);
if ( ret < 5 ) {
G_warning ( "Cannot read input: %s", buf);
break;
}
lines_read++;
G_debug (2, "line: %d %d %f %f %f", id, lcat, offset1, offset2, side_offset);
line = find_line ( &In, lfield, lcat );
if ( line == 0 ) {
G_warning ( "Cannot find line of cat %d", lcat);
break;
}
Vect_read_line ( &In, LPoints, LCats, line );
len = Vect_line_length ( LPoints );
if ( offset2 > len ) {
G_warning ( "End of segment > line length -> cut");
offset2 = len;
}
ret = Vect_line_segment ( LPoints, offset1, offset2, SPoints );
if ( ret == 0 ) {
G_warning ( "Cannot make line segment: cat = %d : %f - %f (line length = %f)\n%s",
lcat, offset1, offset2, len, buf);
break;
}
Vect_cat_set ( SCats, 1, id );
Vect_write_line ( &Out, GV_LINE, SPoints, SCats);
G_debug ( 3, " segment n_points = %d", SPoints->n_points);
lines_written++;
break;
default:
G_warning ("Incorrect segment type: %s", buf );
}
}
Vect_build (&Out, stderr);
/* Free, close ... */
Vect_close(&In);
Vect_close(&Out);
fprintf ( stdout, "%d points read from input\n", points_read);
fprintf ( stdout, "%d points written to output map (%d lost)\n",
points_written, points_read-points_written);
fprintf ( stdout, "%d lines read from input\n", lines_read);
fprintf ( stdout, "%d lines written to output map (%d lost)\n",
lines_written, lines_read-lines_written);
exit(0);
}
/* Find line by cat, returns 0 if not found */
int
find_line ( struct Map_info *Map, int lfield, int lcat )
{
int i, nlines, type, cat;
struct line_cats *Cats;
G_debug (2, "find_line(): llayer = %d lcat = %d", lfield, lcat);
Cats = Vect_new_cats_struct ();
nlines = Vect_get_num_lines ( Map );
for ( i = 1; i <= nlines; i++ ) {
type = Vect_read_line ( Map, NULL, Cats, i );
if ( !(type & GV_LINE) ) continue;
Vect_cat_get ( Cats, lfield, &cat );
if ( cat == lcat ) return i;
}
return 0;
}
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