overlay.c File Reference

Vector library - overlays. More...

#include <string.h>
#include <grass/vector.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) 2001-2009 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

Definition in file overlay.c.

Function Documentation

Vect_overlay()

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
	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
[out]	OMap	output vector map

Returns

0 on success

Definition at line 62 of file overlay.c.

References _, G_fatal_error(), GV_O_AND, and Vect_overlay_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 ?
OMap	output vector map

Returns

1 on success

0 on error

Definition at line 100 of file overlay.c.

Referenced by Vect_overlay().

Vect_overlay_str_to_operator()

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 35 of file overlay.c.

References GV_O_AND, GV_O_OVERLAP, GV_ON_AND, and GV_ON_OVERLAP.