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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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