vedit/snap.c File Reference

Vedit library - snapping. More...

#include <grass/vedit.h>

Include dependency graph for vedit/snap.c:

Go to the source code of this file.

Functions
int	Vedit_snap_point (struct Map_info *Map, int line, double *x, double *y, double *z, double thresh, int vertex)
	Snap given point to the nearest primitive.
int	Vedit_snap_line (struct Map_info *Map, struct Map_info **BgMap, int nbgmaps, int line, struct line_pnts *Points, double thresh, int to_vertex)
	Snap selected primitive to its nearest primitive.
int	Vedit_snap_lines (struct Map_info *Map, struct Map_info **BgMap, int nbgmaps, struct ilist *List, double thresh, int to_vertex)
	Snap lines/boundaries.

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Detailed Description

Vedit library - snapping.

(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>

Date:

2007-2008

Definition in file vedit/snap.c.

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Function Documentation

int Vedit_snap_line	(	struct Map_info *	Map,
		struct Map_info **	BgMap,
		int	nbgmaps,
		int	line,
		struct line_pnts *	Points,
		double	thresh,
		int	to_vertex
	)

Snap selected primitive to its nearest primitive.

Parameters:

	Map	vector map
	BgMap,nbgmaps	list of background maps used for snapping
	line	line id to be snapped (if already written, otherwise -1)
	Points	line geometry
	layer	layer number
	thresh	threshold value used for snapping (>0)
	to_vertex	allow snapping also to vertex

Returns:

1 line snapped

0 line not snapped

-1 line is dead (if 'line' is > 0)

Definition at line 102 of file vedit/snap.c.

References Vect_destroy_cats_struct(), Vect_line_alive(), Vect_new_cats_struct(), Vect_points_distance(), and Vedit_snap_point().

Referenced by Vedit_snap_lines().

int Vedit_snap_lines	(	struct Map_info *	Map,
		struct Map_info **	BgMap,
		int	nbgmaps,
		struct ilist *	List,
		double	thresh,
		int	to_vertex
	)

Snap lines/boundaries.

Parameters:

	Map	vector map
	BgMap,nbgmaps	list of background maps used for snapping
	List	list of lines to be snapped
	layer	layer number
	thresh	threshold value used for snapping (>0)
	to_vertex	allow snapping also to vertex

Returns:

number of snapped lines

-1 on error

Definition at line 178 of file vedit/snap.c.

References Vect_destroy_cats_struct(), Vect_destroy_line_struct(), Vect_new_cats_struct(), Vect_new_line_struct(), Vect_read_line(), Vect_rewrite_line(), and Vedit_snap_line().

int Vedit_snap_point	(	struct Map_info *	Map,
		int	line,
		double *	x,
		double *	y,
		double *	z,
		double	thresh,
		int	vertex
	)

Snap given point to the nearest primitive.

Parameters:

	Map	vector map
	line	line to be excluded (point on line)
	x,y,z	point on line to be snapped
	thresh	snapping threshold (>0)
	vertex	snap also to vertex (non-zero)

Returns:

1 snapped

0 not snapped

Definition at line 31 of file vedit/snap.c.

References Vect_destroy_line_struct(), Vect_find_line(), Vect_line_alive(), Vect_new_line_struct(), Vect_points_distance(), and Vect_read_line().

Referenced by Vedit_move_lines(), Vedit_move_vertex(), and Vedit_snap_line().