gvd.c File Reference

OGSF library - loading and manipulating vector sets (lower level functions) More...

#include <stdio.h>
#include <stdlib.h>
#include <grass/gis.h>
#include <grass/ogsf.h>
#include "rowcol.h"

Include dependency graph for gvd.c:

Go to the source code of this file.

Macros
#define	CHK_FREQ   5

Functions
int	gs_clip_segment (geosurf *gs, float *bgn, float *end, float *region)
	Clip segment. More...
int	gvd_vect (geovect *gv, geosurf *gs, int do_fast)
	Draw vector set. More...
void	gvd_draw_lineonsurf (geosurf *gs, float *bgn, float *end, int color)
	Draw line on surface. More...

Detailed Description

OGSF library - loading and manipulating vector sets (lower level functions)

(C) 1999-2008, 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

Bill Brown USACERL (December 1993)

Doxygenized by Martin Landa (June 2008)

Definition in file gvd.c.

Macro Definition Documentation

CHK_FREQ

#define CHK_FREQ   5

Definition at line 23 of file gvd.c.

Function Documentation

gs_clip_segment()

int gs_clip_segment	(	geosurf *	gs,
		float *	bgn,
		float *	end,
		float *	region
	)

Clip segment.

Todo:

to use fast clipping and move to gs.c

Parameters

gs	surface
bgn	begin point
end	end point
region	region settings

Returns

1 segment inside region

0 segment outside region

Definition at line 39 of file gvd.c.

gvd_draw_lineonsurf()

void gvd_draw_lineonsurf	(	geosurf *	gs,
		float *	bgn,
		float *	end,
		int	color
	)

Draw line on surface.

Parameters

gs	surface
bgn	first line point
end	end line point
color	color value

Definition at line 300 of file gvd.c.

References gs_point_is_masked(), gsd_bgnline(), gsd_color_func(), gsd_endline(), gsd_vert_func(), and gsdrape_get_segments().

gvd_vect()

int gvd_vect	(	geovect *	gv,
		geosurf *	gs,
		int	do_fast
	)

Draw vector set.

Need to think about translations - If user translates surface, vector should automatically go with it, but translating vector should translate it relative to surface on which it's displayed?

Handling mask checking here, but may be more appropriate to handle in get_drape_segments?

Parameters

gv	vector set
gs	surface
do_fast	non-zero for fast mode

Returns

Definition at line 79 of file gvd.c.

Referenced by GV_draw_fastvect(), and GV_draw_vect().