plus_line.c File Reference

Vector library - update topo for lines (lower level functions) More...

#include <sys/types.h>
#include <stdlib.h>
#include <grass/vector.h>
#include <grass/glocale.h>

Include dependency graph for plus_line.c:

Go to the source code of this file.

Functions
int	dig_add_line (struct Plus_head *plus, int type, const struct line_pnts *Points, const struct bound_box *box, off_t offset)
	Add new line to Plus_head structure. More...
int	dig_restore_line (struct Plus_head *plus, int lineid, int type, const struct line_pnts *Points, const struct bound_box *box, off_t offset)
	Restore line in Plus_head structure. More...
int	dig_del_line (struct Plus_head *plus, int line, double x, double y, double z)
	Delete line from Plus_head structure. More...
plus_t	dig_line_get_area (struct Plus_head *plus, plus_t line, int side)
	Get area number on line side. More...
int	dig_line_set_area (struct Plus_head *plus, plus_t line, int side, plus_t area)
	Set area number on line side. More...

Detailed Description

Vector library - update topo for lines (lower level functions)

Lower level functions for reading/writing/manipulating vectors.

This program is free software under the GNU General Public License (>=v2). Read the file COPYING that comes with GRASS for details.

Author

CERL (probably Dave Gerdes), Radim Blazek

Date

2001-2008

Definition in file plus_line.c.

Function Documentation

dig_add_line()

int dig_add_line	(	struct Plus_head *	plus,
		int	type,
		const struct line_pnts *	Points,
		const struct bound_box *	box,
		off_t	offset
	)

Add new line to Plus_head structure.

Parameters

[in,out]	plus	pointer to Plus_head structure
	type	feature type
	Points	line geometry
	box	bounding box
	offset	line offset

Returns

-1 on error

line id

Definition at line 136 of file plus_line.c.

References Plus_head::alloc_lines, dig_alloc_lines(), and Plus_head::n_lines.

dig_del_line()

int dig_del_line	(	struct Plus_head *	plus,
		int	line,
		double	x,
		double	y,
		double	z
	)

Delete line from Plus_head structure.

Doesn't update area/isle references (dig_del_area() or dig_del_isle()) must be run before the line is deleted if the line is part of such structure). Update is info about line in nodes. If this line is last in node then node is deleted.

Parameters

[in,out]	plus	pointer to Plus_head structure
[in]	line	line id
[in]	x,y,z	coordinates

Returns

-1 on error

0 OK

Definition at line 219 of file plus_line.c.

References G_debug(), Plus_head::Line, P_topo_b::N1, and P_topo_b::N2.

dig_line_get_area()

plus_t dig_line_get_area	(	struct Plus_head *	plus,
		plus_t	line,
		int	side
	)

Get area number on line side.

Parameters

[in]	plus	pointer Plus_head structure
[in]	line	line id
[in]	side	side id (GV_LEFT || GV_RIGHT)

Returns

area number

0 no area

-1 on error

Definition at line 343 of file plus_line.c.

References Plus_head::Line.

Referenced by Vect_build_line_area().

dig_line_set_area()

int dig_line_set_area	(	struct Plus_head *	plus,
		plus_t	line,
		int	side,
		plus_t	area
	)

Set area number on line side.

Parameters

[in]	plus	pointer Plus_head structure
[in]	line	line id
[in]	side	side id (GV_LEFT || GV_RIGHT)
[in]	area	area id

Returns

1

Definition at line 384 of file plus_line.c.

References Plus_head::Line.

dig_restore_line()

int dig_restore_line	(	struct Plus_head *	plus,
		int	lineid,
		int	type,
		const struct line_pnts *	Points,
		const struct bound_box *	box,
		off_t	offset
	)

Restore line in Plus_head structure.

Parameters

[in,out]	plus	pointer to Plus_head structure
	type	feature type
	Points	line geometry
	box	bounding box
	offset	line offset

Returns

-1 on error

line id

Definition at line 192 of file plus_line.c.

References Plus_head::n_lines.