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/*!
\file vector/vedit/chtype.c
\brief Vedit library - change primitives type
(C) 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 Change primitive type
Supported conversions:
- point <-> centroid
- line <-> boundary
\param Map pointer to Map_info
\param List list of selected primitives
\return number of modified primitives
\return -1 on error
*/
int Vedit_chtype_lines(struct Map_info *Map, struct ilist *List)
{
int i;
int nret, line;
int type, newtype;
struct line_pnts *Points;
struct line_cats *Cats;
nret = 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 < 0) {
return -1;
}
switch (type) {
case GV_POINT:
newtype = GV_CENTROID;
break;
case GV_CENTROID:
newtype = GV_POINT;
break;
case GV_LINE:
newtype = GV_BOUNDARY;
break;
case GV_BOUNDARY:
newtype = GV_LINE;
break;
default:
newtype = -1;
break;
}
G_debug(3, "Vedit_chtype_lines(): line=%d, from_type=%d, to_type=%d",
line, type, newtype);
if (newtype > 0) {
if (Vect_rewrite_line(Map, line, newtype, Points, Cats) < 0) {
return -1;
}
nret++;
}
}
Vect_destroy_line_struct(Points);
Vect_destroy_cats_struct(Cats);
return nret;
}
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