vector/vedit/move.c

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/*!
  \file lib/vector/vedit/move.c
  
  \brief Vedit library - move 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 Martin Landa <landa.martin gmail.com>
  \author Jachym Cepicky <jachym.cepicky gmail.com>
*/

#include <grass/vedit.h>

/*!
  \brief Move selected primitives
  
  \param Map pointer to Map_info
  \param BgMap, nbgmaps list of background vector maps used for snapping   
  \param List list of primitives to be moved
  \param move_x,move_y,move_z direction (move_z used only if map is 3D)
  \param snap enable snapping (see globals.h)
  
  \return number of modified primitives
  \return -1 on error
*/
int Vedit_move_lines(struct Map_info *Map, struct Map_info **BgMap,
                     int nbgmaps, struct ilist *List, double move_x,
                     double move_y, double move_z, int snap, double thresh)
{
    struct line_pnts *Points;
    struct line_cats *Cats;
    int i, j;
    int type, newline, line;
    int nlines_moved;
    double *x, *y, *z;

    nlines_moved = 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);

        G_debug(3, "Vedit_move_lines(): type=%d, line=%d", type, line);

        x = Points->x;
        y = Points->y;
        z = Points->z;

        /* move */
        for (j = 0; j < Points->n_points; j++) {
            x[j] += move_x;
            y[j] += move_y;
            if (Vect_is_3d(Map))
                z[j] += move_z;

            if (snap != NO_SNAP) {
                if (Vedit_snap_point(Map, line, &x[j], &y[j], &z[j], thresh,
                                     (snap == SNAPVERTEX) ? 1 : 0) == 0) {
                    /* check also background maps */
                    int bgi;

                    for (bgi = 0; bgi < nbgmaps; bgi++) {
                        if (Vedit_snap_point
                            (BgMap[bgi], -1, &x[j], &y[j], &z[j], thresh,
                             (snap == SNAPVERTEX) ? 1 : 0))
                            break;      /* snapped, don't continue */
                    }
                }
            }
        }                       /* for each point at line */

        newline = Vect_rewrite_line(Map, line, type, Points, Cats);

        if (newline < 0) {
            return -1;
        }

        nlines_moved++;
    }

    Vect_destroy_line_struct(Points);
    Vect_destroy_cats_struct(Cats);

    return nlines_moved;
}