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/*!
\file lib/vector/vedit/flip.c
\brief Vedit library - flip lines
(C) 2007-2008 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.
\author Martin Landa <landa.martin gmail.com>
*/
#include <grass/vedit.h>
/*!
\brief Flip direction of selected lines
\param Map pointer to Map_info
\param List list of selected lines
\return number of modified lines
\return -1 on error
*/
int Vedit_flip_lines(struct Map_info *Map, struct ilist *List)
{
struct line_cats *Cats;
struct line_pnts *Points;
int i, line, type;
int nlines_flipped;
nlines_flipped = 0;
Points = Vect_new_line_struct();
Cats = Vect_new_cats_struct();
for (i = 0; i < List->n_values; i++) {
line = List->value[i];
if (!Vect_line_alive(Map, line))
continue;
type = Vect_read_line(Map, Points, Cats, line);
if (!(type & GV_LINES))
continue;
Vect_line_reverse(Points);
if (Vect_rewrite_line(Map, line, type, Points, Cats) < 0) {
return -1;
}
G_debug(3, "Vedit_flip_lines(): line=%d", line);
nlines_flipped++;
}
/* destroy structures */
Vect_destroy_line_struct(Points);
Vect_destroy_cats_struct(Cats);
return nlines_flipped;
}
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