/usr/lib/grass74/include/grass/dataquad.h is in grass-dev 7.4.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* \file qtree.c
*
* \author
* H. Mitasova, I. Kosinovsky, D. Gerdes, Fall 1993,
* University of Illinois and
* US Army Construction Engineering Research Lab
*
* \author H. Mitasova (University of Illinois),
* \author I. Kosinovsky, (USA-CERL)
* \author D.Gerdes (USA-CERL)
*
* \author modified by H. Mitasova, November 1996 (include variable smoothing)
*
* \copyright
* (C) 1993-1996 by Helena Mitasova and the GRASS Development Team
*
* \copyright
* This program is free software under the
* GNU General Public License (>=v2).
* Read the file COPYING that comes with GRASS for details.
*/
#ifndef DATAQUAD_H
#define DATAQUAD_H
#define NW 1
#define NE 2
#define SW 3
#define SE 4
/*!
* Point structure to keep coordinates
*
* It also contains smoothing for the given point.
*/
struct triple
{
double x;
double y;
double z;
double sm; /*!< variable smoothing */
};
struct quaddata
{
double x_orig;
double y_orig;
double xmax;
double ymax;
int n_rows;
int n_cols;
int n_points;
struct triple *points;
};
struct triple *quad_point_new(double, double, double, double);
struct quaddata *quad_data_new(double, double, double, double, int, int, int,
int);
int quad_compare(struct triple *, struct quaddata *);
int quad_add_data(struct triple *, struct quaddata *, double);
int quad_intersect(struct quaddata *, struct quaddata *);
int quad_division_check(struct quaddata *, int);
struct quaddata **quad_divide_data(struct quaddata *, int, double);
int quad_get_points(struct quaddata *, struct quaddata *, int);
#endif
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