gsdiff.c File Reference

OGSF library - manipulating surfaces (lower level functions) More...

#include <grass/gstypes.h>
#include "gsget.h"

Include dependency graph for gsdiff.c:

Go to the source code of this file.

Functions
void	gsdiff_set_SDscale (float scale)
	Set scale. More...
float	gsdiff_get_SDscale (void)
	Get scale. More...
void	gsdiff_set_SDref (geosurf *gsref)
	ADD. More...
geosurf *	gsdiff_get_SDref (void)
	ADD. More...
float	gsdiff_do_SD (float val, int offset)
	ADD. More...

Detailed Description

OGSF library - manipulating surfaces (lower level functions)

GRASS OpenGL gsurf OGSF Library

Routines to set up automatic on-the-fly recalculation of surface elevations, doing a "scaled difference" using another surface for reference

Note that we're using a true difference here, between data set values, no translations, etc.

Todo:

generalize this concept to allow transform functions which are dependent on surfaces that are dependent on other surfaces, etc., as long as the dependency doesn't loop back.

(C) 1999-2008 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

Bill Brown USACERL, GMSL/University of Illinois (November 1994)

Doxygenized by Martin Landa <landa.martin gmail.com> (May 2008)

Definition in file gsdiff.c.

Function Documentation

float gsdiff_do_SD	(	float	val,
		int	offset
	)

ADD.

Parameters

val
offset

Returns

value

Definition at line 94 of file gsdiff.c.

References GET_MAPATT.

Referenced by gs_get_att_typbuff(), gsd_surf_const(), and gsd_wire_surf_const().

geosurf* gsdiff_get_SDref

(

void

)

ADD.

Returns

pointer to geosurf struct

Definition at line 77 of file gsdiff.c.

References NULL.

Referenced by gs_get_att_typbuff(), GS_get_SDsurf(), gsd_surf_const(), and gsd_wire_surf_const().

float gsdiff_get_SDscale

(

void

)

Get scale.

Returns

scale value

Definition at line 54 of file gsdiff.c.

Referenced by GS_get_SDscale().

void gsdiff_set_SDref

(

geosurf *

gsref

)

ADD.

Parameters

gsref

Definition at line 64 of file gsdiff.c.

References gs_get_att_typbuff().

Referenced by GS_set_SDsurf(), and GS_unset_SDsurf().

void gsdiff_set_SDscale

(

float

scale

)

Set scale.

Parameters

scale

value

Definition at line 42 of file gsdiff.c.

Referenced by GS_set_SDscale().