dangles.c File Reference

Vector library - clean geometry (dangles) More...

#include <stdlib.h>
#include <grass/gis.h>
#include <grass/Vect.h>
#include <grass/glocale.h>

Include dependency graph for dangles.c:

Go to the source code of this file.

Macros
#define	REMOVE_DANGLE   0
#define	CHTYPE_DANGLE   1
#define	SELECT_DANGLE   2

Functions
void	Vect_remove_dangles (struct Map_info *Map, int type, double maxlength, struct Map_info *Err)
	Remove dangles from vector map. More...
void	Vect_chtype_dangles (struct Map_info *Map, double maxlength, struct Map_info *Err)
	Change boundary dangles to lines. More...
void	Vect_select_dangles (struct Map_info *Map, int type, double maxlength, struct ilist *List)
	Select dangles from vector map. More...

Detailed Description

Vector library - clean geometry (dangles)

Higher level functions for reading/writing/manipulating vectors.

(C) 2001-2008 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

Radim Blazek

Date

2001-2008

Definition in file dangles.c.

Macro Definition Documentation

#define CHTYPE_DANGLE   1

Definition at line 26 of file dangles.c.

Referenced by Vect_chtype_dangles().

#define REMOVE_DANGLE   0

Definition at line 25 of file dangles.c.

Referenced by Vect_remove_dangles().

#define SELECT_DANGLE   2

Definition at line 27 of file dangles.c.

Referenced by Vect_select_dangles().

Function Documentation

void Vect_chtype_dangles	(	struct Map_info *	Map,
		double	maxlength,
		struct Map_info *	Err
	)

Change boundary dangles to lines.

Change boundary dangles to lines.

Boundary is considered to be a dangle if on at least one end node is no other boundary. If a dangle is formed by more boundaries, such string of boundaries is taken as one dangle.

Optionally deleted dangles are written to error map.

Input map must be opened on level 2 for update at least on GV_BUILD_BASE.

Parameters

Map	input map where have to be deleted
maxlength	maxlength of dangles or -1 for all dangles
Err	vector map where deleted dangles are written or NULL

Returns

Definition at line 80 of file dangles.c.

References CHTYPE_DANGLE, and NULL.

void Vect_remove_dangles	(	struct Map_info *	Map,
		int	type,
		double	maxlength,
		struct Map_info *	Err
	)

Remove dangles from vector map.

Remove dangles of given type shorter than maxlength from vector map.

Line is considered to be a dangle if on at least one end node is no other line of given type(s). If a dangle is formed by more lines, such string of lines is taken as one dangle and either deleted are all parts or nothing.

Optionally deleted dangles are written to error map.

Input map must be opened on level 2 for update.

Parameters

Map	input map where have to be deleted
type	type of dangles (GV_LINES, GV_LINE or GV_BOUNDARY)
maxlength	maxlength of dangles or -1 for all dangles
Err	vector map where deleted dangles are written or NULL

Returns

Definition at line 54 of file dangles.c.

References NULL, and REMOVE_DANGLE.

void Vect_select_dangles	(	struct Map_info *	Map,
		int	type,
		double	maxlength,
		struct ilist *	List
	)

Select dangles from vector map.

Remove dangles of given type shorter than maxlength from vector map.

Line is considered to be a dangle if on at least one end node is no other line of given type(s). If a dangle is formed by more lines, such string of lines is taken as one dangle.

Input map must be opened on level 2 for update.

Parameters

Map	input map where have to be deleted
type	type of dangles (GV_LINES, GV_LINE or GV_BOUNDARY)
maxlength	maxlength of dangles or -1 for all dangles

Returns

Definition at line 104 of file dangles.c.

References NULL, and SELECT_DANGLE.

Referenced by Vedit_select_by_query().