dataquad.h

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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)
 *
 * SPDX-FileCopyrightText: 1993-1996 Helena Mitasova
 * SPDX-FileCopyrightText: GRASS Development Team
 * SPDX-License-Identifier: GPL-2.0-or-later
 */
 
#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