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 list of background vector maps used for snapping
   \param nbgmaps Number of background vector maps in BgMap
   \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)
   \param thresh snapping threshold (>0)
 
   \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;
}