buffer.c File Reference

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

#include <stdlib.h>
#include <math.h>
#include <grass/vector.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

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

Detailed Description

Vector library - nearest, adjust, parallel lines.

Higher level functions for reading/writing/manipulating vectors.

See buffer2.c for replacement.

(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 buffer.c.

Macro Definition Documentation

LENGTH

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

Definition at line 24 of file buffer.c.

PI

#define PI   M_PI

Definition at line 25 of file buffer.c.

Function Documentation

Vect_line_buffer()

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

Create buffer around the line line.

This function is replaced by Vect_line_buffer().

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 381 of file buffer.c.

References GV_BACKWARD, GV_FORWARD, line_pnts::n_points, NULL, PI, Vect_append_point(), Vect_append_points(), Vect_line_parallel(), Vect_line_prune(), Vect_new_line_struct(), Vect_reset_line(), line_pnts::x, and line_pnts::y.

Vect_line_parallel()

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

Create parallel line.

This function is replaced by Vect_line_parallel2().

Parameters

	InPoints	input line
	distance	create parallel 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 353 of file buffer.c.

References G_debug().

Referenced by Vect_line_buffer().