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/***************************************************************
*
* MODULE: v.parallel
*
* AUTHOR(S): Radim Blazek
* Upgraded by Rosen Matev (Google Summer of Code 2008)
* OGR support by Martin Landa <landa.martin gmail.com>
*
* PURPOSE: Create parallel lines
*
* COPYRIGHT: (C) 2008-2009 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.
*
**************************************************************/
#include <stdlib.h>
#include <math.h>
#include <string.h>
#include <grass/gis.h>
#include <grass/vector.h>
#include <grass/glocale.h>
int main(int argc, char *argv[])
{
struct GModule *module;
struct Option *in_opt, *layer_opt, *out_opt, *dista_opt;
struct Option *distb_opt, *angle_opt, *side_opt;
struct Option *tol_opt;
struct Flag *round_flag, *buf_flag;
struct Map_info In, Out;
struct line_pnts *Points, *Points2, *oPoints, **iPoints;
struct line_cats *Cats;
char *desc;
int line, nlines, inner_count, j;
int layer;
double da, db, dalpha, tolerance;
int side;
G_gisinit(argv[0]);
module = G_define_module();
G_add_keyword(_("vector"));
G_add_keyword(_("geometry"));
G_add_keyword(_("buffer"));
G_add_keyword(_("line"));
module->description = _("Creates parallel line to input vector lines.");
in_opt = G_define_standard_option(G_OPT_V_INPUT);
layer_opt = G_define_standard_option(G_OPT_V_FIELD_ALL);
out_opt = G_define_standard_option(G_OPT_V_OUTPUT);
dista_opt = G_define_option();
dista_opt->key = "distance";
dista_opt->type = TYPE_DOUBLE;
dista_opt->required = YES;
dista_opt->options = "0-100000000";
dista_opt->multiple = NO;
dista_opt->description = _("Offset along major axis in map units");
distb_opt = G_define_option();
distb_opt->key = "minordistance";
distb_opt->type = TYPE_DOUBLE;
distb_opt->required = NO;
distb_opt->options = "0-100000000";
distb_opt->multiple = NO;
distb_opt->description = _("Offset along minor axis in map units");
angle_opt = G_define_option();
angle_opt->key = "angle";
angle_opt->type = TYPE_DOUBLE;
angle_opt->required = NO;
angle_opt->answer = "0";
angle_opt->multiple = NO;
angle_opt->description =
_("Angle of major axis in degrees"); /* CW or CCW? does
this even work?? */
side_opt = G_define_option();
side_opt->key = "side";
side_opt->type = TYPE_STRING;
side_opt->required = YES;
side_opt->answer = "right";
side_opt->multiple = NO;
side_opt->options = "left,right,both";
side_opt->description = _("Side");
desc = NULL;
G_asprintf(
&desc, "left;%s;right;%s;both;%s", _("Parallel line is on the left"),
_("Parallel line is on the right"), _("Parallel lines on both sides"));
side_opt->descriptions = desc;
tol_opt = G_define_option();
tol_opt->key = "tolerance";
tol_opt->type = TYPE_DOUBLE;
tol_opt->required = NO;
tol_opt->options = "0-100000000";
tol_opt->multiple = NO;
tol_opt->description = _("Tolerance of arc polylines in map units");
round_flag = G_define_flag();
round_flag->key = 'r';
round_flag->description = _("Make outside corners round");
buf_flag = G_define_flag();
buf_flag->key = 'b';
buf_flag->description = _("Create buffer-like parallel lines");
if (G_parser(argc, argv))
exit(EXIT_FAILURE);
da = atof(dista_opt->answer);
if (distb_opt->answer)
db = atof(distb_opt->answer);
else
db = da;
if (angle_opt->answer)
dalpha = atof(angle_opt->answer);
else
dalpha = 0;
if (tol_opt->answer)
tolerance = atof(tol_opt->answer);
else
tolerance = ((db < da) ? db : da) / 100.;
if (strcmp(side_opt->answer, "right") == 0)
side = 1;
else if (strcmp(side_opt->answer, "left") == 0)
side = -1;
else
side = 0;
Vect_set_open_level(2);
if (Vect_open_old2(&In, in_opt->answer, "", layer_opt->answer) < 0)
G_fatal_error(_("Unable to open vector map <%s>"), in_opt->answer);
layer = Vect_get_field_number(&In, layer_opt->answer);
if (Vect_open_new(&Out, out_opt->answer, 0) < 0)
G_fatal_error(_("Unable to create vector map <%s>"), out_opt->answer);
Vect_copy_head_data(&In, &Out);
Vect_hist_copy(&In, &Out);
Vect_hist_command(&Out);
Points = Vect_new_line_struct();
Points2 = Vect_new_line_struct();
Cats = Vect_new_cats_struct();
nlines = Vect_get_num_lines(&In);
for (line = 1; line <= nlines; line++) {
int ltype;
G_percent(line, nlines, 1);
ltype = Vect_read_line(&In, Points, Cats, line);
if (layer != -1 && !Vect_cat_get(Cats, layer, NULL))
continue;
if (ltype & GV_LINES) {
if (!(buf_flag->answer)) {
if (side != 0) {
Vect_line_parallel2(Points, da, db, dalpha, side,
round_flag->answer, tolerance, Points2);
Vect_write_line(&Out, ltype, Points2, Cats);
}
else {
Vect_line_parallel2(Points, da, db, dalpha, 1,
round_flag->answer, tolerance, Points2);
Vect_write_line(&Out, ltype, Points2, Cats);
Vect_line_parallel2(Points, da, db, dalpha, -1,
round_flag->answer, tolerance, Points2);
Vect_write_line(&Out, ltype, Points2, Cats);
}
}
else {
Vect_line_buffer2(Points, da, db, dalpha, round_flag->answer, 1,
tolerance, &oPoints, &iPoints, &inner_count);
Vect_write_line(&Out, ltype, oPoints, Cats);
for (j = 0; j < inner_count; j++) {
Vect_write_line(&Out, ltype, iPoints[j], Cats);
}
}
}
else {
Vect_write_line(&Out, ltype, Points, Cats);
}
}
/* Vect_build_partial(&Out, GV_BUILD_BASE);
Vect_snap_lines(&Out, GV_BOUNDARY, 1e-7, NULL);
Vect_break_lines(&Out, GV_BOUNDARY, NULL);
Vect_remove_duplicates(&Out, GV_BOUNDARY, NULL);
Vect_build_partial (&Out, GV_BUILD_NONE);
*/
Vect_build(&Out);
Vect_close(&In);
Vect_close(&Out);
exit(EXIT_SUCCESS);
}
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