gsdiff.c File Reference

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

#include <grass/ogsf.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.
float	gsdiff_get_SDscale (void)
	Get scale.
void	gsdiff_set_SDref (geosurf *gsref)
	ADD.
geosurf *	gsdiff_get_SDref (void)
	ADD.
float	gsdiff_do_SD (float val, int offset)
	ADD.

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

gsdiff_do_SD()

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, and gsdiff_do_SD().

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

gsdiff_get_SDref()

geosurf * gsdiff_get_SDref

(

void

)

ADD.

Returns

pointer to geosurf struct

Definition at line 77 of file gsdiff.c.

References gsdiff_get_SDref(), and NULL.

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

gsdiff_get_SDscale()

float gsdiff_get_SDscale

(

void

)

Get scale.

Returns

scale value

Definition at line 54 of file gsdiff.c.

References gsdiff_get_SDscale().

Referenced by GS_get_SDscale(), and gsdiff_get_SDscale().

gsdiff_set_SDref()

void gsdiff_set_SDref

(

geosurf *

gsref

)

ADD.

Parameters

gsref

Definition at line 64 of file gsdiff.c.

References gs_get_att_typbuff(), and gsdiff_set_SDref().

Referenced by GS_set_SDsurf(), GS_unset_SDsurf(), and gsdiff_set_SDref().

gsdiff_set_SDscale()

void gsdiff_set_SDscale

(

float

scale

)

Set scale.

Parameters

scale

value

Definition at line 42 of file gsdiff.c.

References gsdiff_set_SDscale().

Referenced by GS_set_SDscale(), and gsdiff_set_SDscale().