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/*!
\file lib/vector/vedit/vertex.c
\brief Vedit library - vertex manipulation
(C) 2006-2008 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 Move all vertices in bounding box(es)
\param Map pointer to Map_info
\param BgMap, nbgmaps list of background vector maps for snapping
\param List list of selected lines
\param coord points location
\param thresh_coords threshold value for selecting lines
\param thresh_snap threshold value used for snapping
\param move_x,move_y,move_z direction (move_z is used when map is 3D)
\param move_first move only first vertex found in the bounding box
\param snap snapping mode (see vedit.h)
\return number of moved verteces
\return -1 on error
*/
int Vedit_move_vertex(struct Map_info *Map, struct Map_info **BgMap,
int nbgmaps, struct ilist *List,
struct line_pnts *coord, double thresh_coords,
double thresh_snap, double move_x, double move_y,
double move_z, int move_first, int snap)
{
int nvertices_moved, nlines_modified, nvertices_snapped;
int i, j, k;
int line, type, rewrite;
int npoints;
double east, north, dist;
double *x, *y, *z;
char *moved;
struct line_pnts *Points, *Points_snap;
struct line_cats *Cats;
nlines_modified = 0;
nvertices_moved = nvertices_snapped = 0;
moved = NULL;
Points = Vect_new_line_struct();
Points_snap = 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 & GV_LINES))
continue;
npoints = Points->n_points;
x = Points->x;
y = Points->y;
z = Points->z;
/* vertex moved
0 not moved
1 moved
2 moved and snapped
*/
moved =
(char *)G_realloc((void *)moved, Points->n_points * sizeof(char));
G_zero((void *)moved, Points->n_points * sizeof(char));
rewrite = 0;
for (j = 0; j < coord->n_points; j++) {
east = coord->x[j];
north = coord->y[j];
/* move all vertices in the bounding box */
for (k = 0; k < Points->n_points; k++) {
if (moved[k] == 0) {
dist = Vect_points_distance(east, north, 0.0,
x[k], y[k], z[k], WITHOUT_Z);
if (dist <= thresh_coords) {
G_debug(3,
"Vedit_move_vertex(): line=%d; x=%f, y=%f -> x=%f, y=%f",
line, x[k], y[k], x[k] + move_x,
y[k] + move_y);
x[k] += move_x;
y[k] += move_y;
if (Vect_is_3d(Map))
z[k] += move_z;
moved[k] = 1;
G_debug(3, "Vedit_move_vertex(): line=%d, point=%d",
line, k);
if (snap != NO_SNAP) {
if (Vedit_snap_point
(Map, line, &x[k], &y[k], &z[k], thresh_snap,
(snap == SNAPVERTEX) ? 1 : 0) == 0) {
/* check also background maps */
int bgi;
for (bgi = 0; bgi < nbgmaps; bgi++) {
if (Vedit_snap_point
(BgMap[bgi], line, &x[k], &y[k],
&z[k], thresh_snap,
(snap == SNAPVERTEX) ? 1 : 0))
moved[k] = 2;
break; /* snapped, don't continue */
}
}
else {
moved[k] = 2;
}
}
rewrite = 1;
nvertices_moved++;
if (move_first)
break;
}
}
} /* for each line vertex */
/* close line or boundary */
if ((type & GV_LINES) &&
Vect_points_distance(x[0], y[0], z[0],
x[npoints - 1], y[npoints - 1],
z[npoints - 1],
WITHOUT_Z) <= thresh_snap) {
if (moved[0] == 1) { /* first node moved */
x[0] = x[npoints - 1];
y[0] = y[npoints - 1];
if (Vect_is_3d(Map))
z[0] = z[npoints - 1];
}
else if (moved[npoints - 1] == 1) { /* last node moved */
x[npoints - 1] = x[0];
y[npoints - 1] = y[0];
if (Vect_is_3d(Map))
z[npoints - 1] = z[0];
}
}
} /* for each coord */
if (rewrite) {
if (Vect_rewrite_line(Map, line, type, Points, Cats) < 0) {
return -1;
}
nlines_modified++;
}
} /* for each selected line */
/* destroy structures */
Vect_destroy_line_struct(Points);
Vect_destroy_line_struct(Points_snap);
Vect_destroy_cats_struct(Cats);
/* G_free ((void *) moved); */
return nvertices_moved;
}
/*!
\brief Add new vertex to line
Shape of line is not changed.
\todo 3D
\param Map pointer to Map_info
\param List list of lines
\param coord points location
\param thresh find line in given threshold
\return number of add verteces
\return -1 on error
*/
int Vedit_add_vertex(struct Map_info *Map, struct ilist *List,
struct line_pnts *coord, double thresh)
{
int i, j;
int type, line, seg;
int nlines_modified, nvertices_added, rewrite;
double east, north, dist;
double *x, *y, *z;
double px, py;
struct line_pnts *Points;
struct line_cats *Cats;
nlines_modified = 0;
nvertices_added = 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 & GV_LINES))
continue;
x = Points->x;
y = Points->y;
z = Points->z;
rewrite = 0;
for (j = 0; j < coord->n_points; j++) {
east = coord->x[j];
north = coord->y[j];
seg = Vect_line_distance(Points, east, north, 0.0, /* standpoint */
WITHOUT_Z, &px, &py, NULL, /* point on line */
&dist, /* distance to line */
NULL, NULL);
if (dist <= thresh &&
Vect_points_distance(px, py, 0.0, x[seg], y[seg], z[seg],
WITHOUT_Z) > 0 &&
Vect_points_distance(px, py, 0.0, x[seg - 1], y[seg - 1],
z[seg - 1], WITHOUT_Z) > 0) {
/* add new vertex */
Vect_line_insert_point(Points, seg, px, py, 0.0);
G_debug(3,
"Vedit_add_vertex(): line=%d; x=%f, y=%f, index=%d",
line, px, py, seg);
rewrite = 1;
nvertices_added++;
}
} /* for each point */
/* rewrite the line */
if (rewrite) {
Vect_line_prune(Points);
if (Vect_rewrite_line(Map, line, type, Points, Cats) < 0) {
return -1;
}
nlines_modified++;
}
} /* for each line */
/* destroy structures */
Vect_destroy_line_struct(Points);
Vect_destroy_cats_struct(Cats);
return nvertices_added;
}
/*!
\brief Remove vertex from line
\todo 3D
\param Map pointer to Map_info
\param List list of selected lines
\param coord points location
\param thresh threshold value to find a line
\return number of removed vertices
\return -1 on error
*/
int Vedit_remove_vertex(struct Map_info *Map, struct ilist *List,
struct line_pnts *coord, double thresh)
{
int i, j, k;
int type, line;
int nvertices_removed, rewrite, nlines_modified;
double east, north;
double dist;
double *x, *y, *z;
struct line_pnts *Points;
struct line_cats *Cats;
nvertices_removed = nlines_modified = 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 & GV_LINES))
continue;
x = Points->x;
y = Points->y;
z = Points->z;
rewrite = 0;
for (j = 0; j < coord->n_points; j++) {
east = coord->x[j];
north = coord->y[j];
for (k = 0; k < Points->n_points; k++) {
dist = Vect_points_distance(east, north, 0.0,
x[k], y[k], z[k], WITHOUT_Z);
if (dist <= thresh) {
/* remove vertex */
Vect_line_delete_point(Points, k);
G_debug(3,
"Vedit_remove_vertex(): line=%d; x=%f, y=%f, index=%d",
line, x[k], y[k], k);
k--;
nvertices_removed++;
rewrite = 1;
}
} /* for each point */
} /* for each bounding box */
if (rewrite) {
/* rewrite the line */
if (Vect_rewrite_line(Map, line, type, Points, Cats) < 0) {
return -1;
}
nlines_modified++;
}
} /* for each line */
/* destroy structures */
Vect_destroy_line_struct(Points);
Vect_destroy_cats_struct(Cats);
return nvertices_removed;
}
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