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

#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)

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

#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

#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.

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

int	iso_r_cndx (data_buffer *dbuff)
	Read cube index.

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

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

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

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

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

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

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

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

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

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

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

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

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 31 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 806 of file gvl_calc.c.

◆ FOR_0_TO_N

#define FOR_0_TO_N	(	n,
		cmd
	)

Value:

    {                                               \
        int FOR_VAR;                                \
        for (FOR_VAR = 0; FOR_VAR < n; FOR_VAR++) { \
            cmd;                                    \
        }                                           \
    }

Definition at line 47 of file gvl_calc.c.

◆ FOR_VAR

#define FOR_VAR i_for

Definition at line 46 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 65 of file gvl_calc.c.

◆ LINTERP

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

Definition at line 36 of file gvl_calc.c.

◆ READ

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

Definition at line 59 of file gvl_calc.c.

◆ SET_IN_DATA

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

Definition at line 66 of file gvl_calc.c.

◆ SKIP

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

Definition at line 60 of file gvl_calc.c.

◆ SLICE_MODE_INTERP_NO

#define SLICE_MODE_INTERP_NO 0

Definition at line 809 of file gvl_calc.c.

◆ SLICE_MODE_INTERP_YES

#define SLICE_MODE_INTERP_YES 1

Definition at line 810 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 37 of file gvl_calc.c.