vector/vedit/copy.c

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/*!
   \file lib/vector/vedit/copy.c
 
   \brief Vedit library - copy primitives
 
   (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 Jachym Cepicky <jachym.cepicky gmail.com>
   \author Martin Landa <landa.martin gmail.com>
 */
 
#include <grass/vedit.h>
 
/*!
   \brief Copy selected primitives
 
   \param Map pointer to Map_info copy to
   \param FromMap vector map copy from (if not given use Map)
   \param List list of selected primitives (to be copied)
 
   \return number of copied primitives
   \return -1 on error
 */
int Vedit_copy_lines(struct Map_info *Map, struct Map_info *FromMap,
                     struct ilist *List)
{
    struct line_cats *Cats;
    struct line_pnts *Points;
    int i;
    int type, line;
    int nlines_copied;
 
    nlines_copied = 0;
    Cats = Vect_new_cats_struct();
    Points = Vect_new_line_struct();
 
    if (!FromMap) {
        FromMap = Map;
    }
 
    /* for each line, make a copy */
    for (i = 0; i < List->n_values; i++) {
        line = List->value[i];
 
        if (!Vect_line_alive(FromMap, line))
            continue;
 
        type = Vect_read_line(FromMap, Points, Cats, line);
 
        G_debug(3, "Vedit_copy_lines(): type=%d, line=%d", type, line);
 
        /* copy */
        if (Vect_write_line(Map, type, Points, Cats) < 0) {
            return -1;
        }
 
        nlines_copied++;
    }
 
    Vect_destroy_line_struct(Points);
    Vect_destroy_cats_struct(Cats);
 
    return nlines_copied;
}