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/****************************************************************************
*
* MODULE: v.decimate
* AUTHOR(S): Vaclav Petras
* PURPOSE: Reduce the number of points in a vector map
* COPYRIGHT: (C) 2015 by the GRASS Development Team
*
* This program is free software under the GNU General Public
* License (>=v2). Read the COPYING file that comes with GRASS
* for details.
*
*****************************************************************************/
#ifndef GRASS_GRID_DECIMATION_H
#define GRASS_GRID_DECIMATION_H
#include <grass/gis.h>
struct DecimationPoint {
int cat;
double x;
double y;
double z;
};
struct GridDecimation {
struct DecimationPoint ***grid_points;
size_t *grid_sizes;
int rows;
int cols;
int max_points;
double minx;
double maxx;
double miny;
double maxy;
double ns_res;
double ew_res;
int (*if_add_point)(struct DecimationPoint *point, void *point_data,
struct DecimationPoint **point_list, size_t npoints,
void *context);
void (*on_add_point)(struct DecimationPoint *point, void *point_data,
void *context);
void *if_context;
void *on_context;
};
/* max size: rows * cols < max of size_t (using 1D array) */
void grid_decimation_create(struct GridDecimation *grid_decimation, size_t rows,
size_t cols);
void grid_decimation_create_from_region(struct GridDecimation *grid_decimation,
struct Cell_head *region);
/* TODO: possible use (also?) Cell_head as input or storage */
void grid_decimation_set_region(struct GridDecimation *grid_decimation,
double minx, double maxx, double miny,
double maxy, double ns_res, double ew_res);
void grid_decimation_create_list_with_point(
struct GridDecimation *grid_decimation, size_t index,
struct DecimationPoint *point, size_t npoints);
void grid_decimation_add_point_to_list(struct GridDecimation *grid_decimation,
size_t index,
struct DecimationPoint *point,
size_t npoints);
void grid_decimation_try_add_point(struct GridDecimation *grid_decimation,
int cat, double x, double y, double z,
void *point_data);
void grid_decimation_destroy(struct GridDecimation *grid_decimation);
#endif /* GRASS_GRID_DECIMATION_H */
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