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.

Defines
#define	LENGTH(DX, DY)   ( sqrt( (DX*DX)+(DY*DY) ) )
#define	PI   M_PI
Functions
void	Vect_line_parallel (struct line_pnts *InPoints, double distance, double tolerance, int rm_end, struct line_pnts *OutPoints)
	Create parrallel line.
void	Vect_line_buffer (struct line_pnts *InPoints, double distance, double tolerance, struct line_pnts *OutPoints)
	Create buffer around the line line.

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Detailed Description

Vector library - nearest, adjust, parallel lines.

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 buffer.c.

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Define Documentation

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

Definition at line 25 of file buffer.c.

Referenced by add_ipoint().

#define PI   M_PI

Definition at line 26 of file buffer.c.

Referenced by Vect_line_buffer(), and Vect_point_buffer2().

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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 380 of file buffer.c.

References PI, Vect_append_point(), Vect_append_points(), Vect_line_parallel(), Vect_line_prune(), Vect_new_line_struct(), and Vect_reset_line().

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 354 of file buffer.c.

Referenced by Vect_line_buffer().