Geografic-Information-System/lib/vector/vedit/copy.c

/*!
  \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;
}