buffer.c File Reference

Vector library - nearest, adjust, parallel lines. More...

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

Include dependency graph for buffer.c:

Go to the source code of this file.

Macros
#define	LENGTH(DX, DY)   ( sqrt( (DX*DX)+(DY*DY) ) )
#define	PI   M_PI
#define	D_MULT   0.99999999 /* distance multiplier for point_in_buf() */

Functions
void	Vect_line_parallel (struct line_pnts *InPoints, double distance, double tolerance, int rm_end, struct line_pnts *OutPoints)
	Create parrallel line. More...
void	Vect_line_buffer (struct line_pnts *InPoints, double distance, double tolerance, struct line_pnts *OutPoints)
	Create buffer around the line line. More...

Detailed Description

Vector library - nearest, adjust, parallel lines.

Higher level functions for reading/writing/manipulating vectors.

(C) 2001-2011 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

Markus Metz

Date

2001-2011

Definition in file buffer.c.

Macro Definition Documentation

#define D_MULT   0.99999999 /* distance multiplier for point_in_buf() */

Definition at line 63 of file buffer.c.

Referenced by Vect_line_buffer().

#define LENGTH	(		DX,
			DY
	)		( sqrt( (DX*DX)+(DY*DY) ) )

Definition at line 61 of file buffer.c.

#define PI   M_PI

Definition at line 62 of file buffer.c.

Referenced by Vect_line_buffer().

Function Documentation

void Vect_line_buffer	(	struct line_pnts *	InPoints,
		double	distance,
		double	tolerance,
		struct line_pnts *	OutPoints
	)

Create buffer around the line line.

Buffer is closed counter clockwise polygon. Warning: output line may contain loops!

Parameters

	InPoints	input line
	distance	create buffer in distance
	tolerance	maximum distance between theoretical arc and polygon segments
[out]	OutPoints	output line

Definition at line 851 of file buffer.c.

References D_MULT, G_debug(), NULL, PI, Vect_append_point(), Vect_append_points(), Vect_line_prune(), Vect_new_line_struct(), Vect_reset_line(), and y.

void Vect_line_parallel	(	struct line_pnts *	InPoints,
		double	distance,
		double	tolerance,
		int	rm_end,
		struct line_pnts *	OutPoints
	)

Create parrallel line.

Parameters

	InPoints	input line
	distance	create parrallel line in distance
	tolerance	maximum distance between theoretical arc and polygon segments
	rm_end	remove end points falling into distance
[out]	OutPoints	output line

Returns

Definition at line 823 of file buffer.c.

References G_debug().