overlay.c File Reference

Vector library - overlays. More...

#include <string.h>
#include <grass/Vect.h>
#include <grass/glocale.h>

Include dependency graph for overlay.c:

Go to the source code of this file.

Functions
int	Vect_overlay_and (struct Map_info *AMap, int atype, struct ilist *AList, struct ilist *AAList, struct Map_info *BMap, int btype, struct ilist *BList, struct ilist *BAList, struct Map_info *OMap)
	Overlay 2 vector maps with AND. More...
int	Vect_overlay_str_to_operator (const char *str)
	Get operator code from string. More...
int	Vect_overlay (struct Map_info *AMap, int atype, struct ilist *AList, struct ilist *AAList, struct Map_info *BMap, int btype, struct ilist *BList, struct ilist *BAList, int operator, struct Map_info *OMap)
	Overlay 2 vector maps and create new one. More...

Detailed Description

Vector library - overlays.

Higher level functions for reading/writing/manipulating vectors.

This is file is just example and starting point for writing overlay functions!!!

(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

Definition in file overlay.c.

Function Documentation

int Vect_overlay	(	struct Map_info *	AMap,
		int	atype,
		struct ilist *	AList,
		struct ilist *	AAList,
		struct Map_info *	BMap,
		int	btype,
		struct ilist *	BList,
		struct ilist *	BAList,
		int	operator,
		struct Map_info *	OMap
	)

Overlay 2 vector maps and create new one.

Parameters

AMap	vector map A
AList	unused ?
AAList	unused ?
BMap	vector map B
BList	unused ?
BAList	unused ?
operator	operator code
OMap	output vector map

Returns

0 on success

Definition at line 64 of file overlay.c.

References G_fatal_error(), and Vect_overlay_and().

int Vect_overlay_and	(	struct Map_info *	AMap,
		int	atype,
		struct ilist *	AList,
		struct ilist *	AAList,
		struct Map_info *	BMap,
		int	btype,
		struct ilist *	BList,
		struct ilist *	BAList,
		struct Map_info *	OMap
	)

Overlay 2 vector maps with AND.

AND supports:point line area point + - + line - - - area + - -

Parameters

AMap	vector map A
atype	feature type for A
AList	unused ?
AAList	unused ?
BMap	vector map B
btype	feature type for B
BList	unused ?
BAList	unused ?
operator	operator code

Returns

1 on success

0 on error

Definition at line 102 of file overlay.c.

References G_debug(), G_warning(), main::GV_LINES, NULL, Vect_cat_set(), Vect_find_area(), Vect_find_node(), Vect_get_area_centroid(), Vect_get_node_line(), Vect_get_node_n_lines(), Vect_get_num_lines(), Vect_list_append(), Vect_new_cats_struct(), Vect_new_line_struct(), Vect_new_list(), Vect_read_line(), Vect_reset_cats(), Vect_val_in_list(), and Vect_write_line().

Referenced by Vect_overlay().

int Vect_overlay_str_to_operator

(

const char *

str

)

Get operator code from string.

Parameters

str	operator code string

Returns

operator code

-1 on error

Definition at line 39 of file overlay.c.