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. More...
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. More...
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. More...

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>

Definition in file vedit/snap.c.

Function Documentation

Vedit_snap_line()

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	pointer to Map_info
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 99 of file vedit/snap.c.

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	pointer to Map_info
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 175 of file vedit/snap.c.

Vedit_snap_point()

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	pointer to Map_info
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 28 of file vedit/snap.c.