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

#include <math.h>
#include <grass/gis.h>
#include <grass/ogsf.h>
#include "rgbpack.h"
#include "mc33_table.h"

Include dependency graph for gvl_calc.c:

Macros
#define	BUFFER_SIZE 1000000
	memory buffer for writing More...

#define	LINTERP(d, a, b) (a + d * (b - a))

#define	TINTERP(d, v)

#define	FOR_VAR i_for

#define	FOR_0_TO_N(n, cmd) { int FOR_VAR; for (FOR_VAR = 0; FOR_VAR < n; FOR_VAR++) {cmd;} }

#define	WRITE(c) gvl_write_char(dbuff->ndx_new++, &(dbuff->new), c)
	writing and reading isosurface data More...

#define	READ() gvl_read_char(dbuff->ndx_old++, dbuff->old)

#define	SKIP(n) dbuff->ndx_old = dbuff->ndx_old + n

#define	IS_IN_DATA(att) ((isosurf->data_desc >> att) & 1)
	check and set data descriptor More...

#define	SET_IN_DATA(att) isosurf->data_desc = (isosurf->data_desc \| (1 << att))

#define	DISTANCE_2(x1, y1, x2, y2) sqrt((x1-x2)(x1-x2)+(y1-y2)(y1-y2))

#define	SLICE_MODE_INTERP_NO 0

#define	SLICE_MODE_INTERP_YES 1

Functions
int	mc33_process_cube (int c_ndx, float *v)
	ADD. More...

void	iso_w_cndx (int ndx, data_buffer *dbuff)
	Write cube index. More...

int	iso_r_cndx (data_buffer *dbuff)
	Read cube index. More...

int	iso_get_cube_value (geovol_isosurf isosurf, int desc, int x, int y, int z, float v)
	Get value from data input. More...

void	iso_get_range (geovol_isosurf isosurf, int desc, double min, double *max)
	Get volume file values range. More...

int	iso_get_cube_values (geovol_isosurf isosurf, int desc, int x, int y, int z, float v)
	Read values for cube. More...

void	iso_get_cube_grads (geovol_isosurf isosurf, int x, int y, int z, float(grad)[3])
	Calculate cube grads. More...

void	iso_calc_cube (geovol_isosurf isosurf, int x, int y, int z, data_buffer dbuff)
	Process cube. More...

int	gvl_isosurf_calc (geovol *gvol)
	Fill data structure with computed isosurfaces polygons. More...

void	gvl_write_char (int pos, unsigned char **data, unsigned char c)
	ADD. More...

unsigned char	gvl_read_char (int pos, const unsigned char *data)
	Read char. More...

void	gvl_align_data (int pos, unsigned char **data)
	Append data to buffer. More...

float	slice_get_value (geovol *gvl, int x, int y, int z)
	Get volume value. More...

int	slice_calc (geovol gvl, int ndx_slc, void colors)
	Calculate slices. More...

int	gvl_slices_calc (geovol *gvol)
	Calculate slices for given volume set. More...

Variables
int	Rows

int	Cols

int	Depths

double	ResX

double	ResY

double	ResZ

Detailed Description

OGSF library - loading and manipulating volumes (lower level functions)

GRASS OpenGL gsurf OGSF Library

This program is free software under the GNU General Public License (>=v2). Read the file COPYING that comes with GRASS for details.

Author: Tomas Paudits (February 2004); Doxygenized by Martin Landa <landa.martin gmail.com> (May 2008)

Definition in file gvl_calc.c.

Macro Definition Documentation

◆ BUFFER_SIZE

#define BUFFER_SIZE 1000000

memory buffer for writing

Definition at line 30 of file gvl_calc.c.

◆ DISTANCE_2

#define DISTANCE_2	(	x1,
		y1,
		x2,
		y2
	)	sqrt((x1-x2)(x1-x2)+(y1-y2)(y1-y2))

Definition at line 805 of file gvl_calc.c.

◆ FOR_0_TO_N

#define FOR_0_TO_N	(	n,
		cmd
	)	{ int FOR_VAR; for (FOR_VAR = 0; FOR_VAR < n; FOR_VAR++) {cmd;} }

Definition at line 46 of file gvl_calc.c.

◆ FOR_VAR

#define FOR_VAR i_for

Definition at line 45 of file gvl_calc.c.

◆ IS_IN_DATA

#define IS_IN_DATA ( att ) ((isosurf->data_desc >> att) & 1)

check and set data descriptor

Definition at line 58 of file gvl_calc.c.

◆ LINTERP

#define LINTERP	(	d,
		a,
		b
	)	(a + d * (b - a))

Definition at line 35 of file gvl_calc.c.

◆ READ

#define READ ( ) gvl_read_char(dbuff->ndx_old++, dbuff->old)

Definition at line 52 of file gvl_calc.c.

Referenced by iso_r_cndx().

◆ SET_IN_DATA

#define SET_IN_DATA ( att ) isosurf->data_desc = (isosurf->data_desc | (1 << att))

Definition at line 59 of file gvl_calc.c.

◆ SKIP

#define SKIP ( n ) dbuff->ndx_old = dbuff->ndx_old + n

Definition at line 53 of file gvl_calc.c.

◆ SLICE_MODE_INTERP_NO

#define SLICE_MODE_INTERP_NO 0

Definition at line 807 of file gvl_calc.c.

◆ SLICE_MODE_INTERP_YES

#define SLICE_MODE_INTERP_YES 1

Definition at line 808 of file gvl_calc.c.

◆ TINTERP

#define TINTERP	(	d,
		v
	)

Value:

((v[0]*(1.-d[0])*(1.-d[1])*(1.-d[2])) +\
                        (v[1]*d[0]*(1.-d[1])*(1.-d[2])) + \
                        (v[2]*d[0]*d[1]*(1.-d[2])) + \
                        (v[3]*(1.-d[0])*d[1]*(1.-d[2])) + \
                        (v[4]*(1.-d[0])*(1.-d[1])*d[2]) + \
                        (v[5]*d[0]*(1.-d[1])*d[2]) + \
                        (v[6]*d[0]*d[1]*d[2]) + \
                        (v[7]*(1.-d[0])*d[1]*d[2]))

Definition at line 36 of file gvl_calc.c.

◆ WRITE

#define WRITE ( c ) gvl_write_char(dbuff->ndx_new++, &(dbuff->new), c)

writing and reading isosurface data

Definition at line 51 of file gvl_calc.c.

Referenced by iso_r_cndx(), and iso_w_cndx().

Function Documentation

◆ gvl_align_data()

void gvl_align_data	(	int	pos,
		unsigned char **	data
	)

Append data to buffer.

Parameters

pos	position index
data	data buffer

Definition at line 779 of file gvl_calc.c.

◆ gvl_isosurf_calc()

int gvl_isosurf_calc ( geovol * gvol )

Fill data structure with computed isosurfaces polygons.

Parameters

gvol	pointer to geovol struct

Returns: 1

Definition at line 585 of file gvl_calc.c.

References x.

Referenced by gvld_vol().

◆ gvl_read_char()

unsigned char gvl_read_char	(	int	pos,
		const unsigned char *	data
	)

Read char.

Parameters

pos	position index
data	data buffer

Returns: char on success; NULL on failure

Definition at line 765 of file gvl_calc.c.

◆ gvl_slices_calc()

int gvl_slices_calc ( geovol * gvol )

Calculate slices for given volume set.

Parameters

gvol	pointer to geovol struct

Returns: 1

Definition at line 1037 of file gvl_calc.c.

Referenced by gvld_vol().

◆ gvl_write_char()

void gvl_write_char	(	int	pos,
		unsigned char **	data,
		unsigned char	c
	)

ADD.

Parameters

pos
data
c

Definition at line 737 of file gvl_calc.c.

◆ iso_calc_cube()

void iso_calc_cube	(	geovol_isosurf *	isosurf,
		int	x,
		int	y,
		int	z,
		data_buffer *	dbuff
	)

Process cube.

Parameters

isosurf
x,y,z
dbuff

Definition at line 323 of file gvl_calc.c.

◆ iso_get_cube_grads()

void iso_get_cube_grads	(	geovol_isosurf *	isosurf,
		int	x,
		int	y,
		int	z,
		float(*)	grad[3]
	)

Calculate cube grads.

Parameters

isosurf
x,y,z
grad

Definition at line 246 of file gvl_calc.c.

References ATT_TOPO, Cols, Depths, iso_get_cube_value(), and Rows.

◆ iso_get_cube_value()

int iso_get_cube_value	(	geovol_isosurf *	isosurf,
		int	desc,
		int	x,
		int	y,
		int	z,
		float *	v
	)

Get value from data input.

Parameters

	isosurf
	desc
	x,y,z
[out]	value

Returns: 0; ?

Definition at line 155 of file gvl_calc.c.

Referenced by iso_get_cube_grads(), and iso_get_cube_values().

◆ iso_get_cube_values()

int iso_get_cube_values	(	geovol_isosurf *	isosurf,
		int	desc,
		int	x,
		int	y,
		int	z,
		float *	v
	)

Read values for cube.

Parameters

	isosurf
	desc
	x,y,z
[out]	v

Returns

Definition at line 223 of file gvl_calc.c.

References iso_get_cube_value().

◆ iso_get_range()

void iso_get_range	(	geovol_isosurf *	isosurf,
		int	desc,
		double *	min,
		double *	max
	)

Get volume file values range.

Parameters

	isosurf
	desc
[out]	min
[out]	max

Definition at line 206 of file gvl_calc.c.

References geovol_isosurf::att, gvl_file_get_min_max(), gvl_file_get_volfile(), and geovol_isosurf_att::hfile.

◆ iso_r_cndx()

int iso_r_cndx ( data_buffer * dbuff )

Read cube index.

Parameters

dbuff

Definition at line 120 of file gvl_calc.c.

References READ, and WRITE.

◆ iso_w_cndx()

void iso_w_cndx	(	int	ndx,
		data_buffer *	dbuff
	)

Write cube index.

Parameters

ndx
dbuff

Definition at line 85 of file gvl_calc.c.

References WRITE.

◆ mc33_process_cube()

int mc33_process_cube	(	int	c_ndx,
		float *	v
	)

ADD.

Parameters

c_ndx
v

Returns

Definition at line 307 of file gvl_calc2.c.

References m_case.

◆ slice_calc()

int slice_calc	(	geovol *	gvl,
		int	ndx_slc,
		void *	colors
	)

Calculate slices.

Parameters

gvl	pointer to geovol struct
ndx_slc
colors

Returns: 1

Definition at line 857 of file gvl_calc.c.

◆ slice_get_value()

float slice_get_value	(	geovol *	gvl,
		int	x,
		int	y,
		int	z
	)

Get volume value.

Parameters

gvl	pointer to geovol struct
x,y,z

Returns: value

Definition at line 818 of file gvl_calc.c.

Variable Documentation

◆ Cols

int Cols

Definition at line 73 of file gvl_calc.c.

Referenced by alloc_slice_buff(), alloc_vol_buff(), get_slice_value(), get_vol_value(), and iso_get_cube_grads().

◆ Depths

int Depths

Definition at line 73 of file gvl_calc.c.

Referenced by alloc_vol_buff(), and iso_get_cube_grads().

◆ ResX

double ResX

Definition at line 74 of file gvl_calc.c.

◆ ResY

double ResY

Definition at line 74 of file gvl_calc.c.

◆ ResZ

double ResZ

Definition at line 74 of file gvl_calc.c.

◆ Rows

int Rows

Definition at line 73 of file gvl_calc.c.

Referenced by alloc_slice_buff(), alloc_vol_buff(), get_vol_value(), and iso_get_cube_grads().

Macros

Functions

Variables

Detailed Description

Macro Definition Documentation

◆ BUFFER_SIZE

◆ DISTANCE_2

◆ FOR_0_TO_N

◆ FOR_VAR

◆ IS_IN_DATA

◆ LINTERP

◆ READ

◆ SET_IN_DATA

◆ SKIP

◆ SLICE_MODE_INTERP_NO

◆ SLICE_MODE_INTERP_YES

◆ TINTERP

◆ WRITE

Function Documentation

◆ gvl_align_data()

◆ gvl_isosurf_calc()

◆ gvl_read_char()

◆ gvl_slices_calc()

◆ gvl_write_char()

◆ iso_calc_cube()

◆ iso_get_cube_grads()

◆ iso_get_cube_value()

◆ iso_get_cube_values()

◆ iso_get_range()

◆ iso_r_cndx()

◆ iso_w_cndx()

◆ mc33_process_cube()

◆ slice_calc()

◆ slice_get_value()

Variable Documentation

◆ Cols

◆ Depths

◆ ResX

◆ ResY

◆ ResZ

◆ Rows