#include <grass/gis.h>
#ifndef GLOBAL
#define GLOBAL extern
#define INIT(x)
#else
#define INIT(x) =(x)
#endif

struct Distance
{
    int ncols;
    int prev_ncols;
    double dist;
    char *label;
};

typedef unsigned char MAPTYPE;
#define MAX_DIST 254
/* if MAPTYPE is changed to unsigned short, MAX_DIST can be set to 2^16-2
 * (if short is 2 bytes)
 */

GLOBAL struct Distance *distances;
GLOBAL int ndist;
GLOBAL int wrap_ncols INIT(0);
GLOBAL MAPTYPE *map;
GLOBAL struct Cell_head window;
GLOBAL int minrow, maxrow, mincol, maxcol;
GLOBAL char *pgm_name;
GLOBAL double meters_to_grid INIT(1.0);
GLOBAL double ns_to_ew_squared;
GLOBAL int count_rows_with_data;

#define MAPINDEX(r,c) (r * window.cols + c)
#define ZONE_INCR 2

#define FEET_TO_METERS 0.3048
#define MILES_TO_METERS 1609.344
#define NAUT_MILES_TO_METERS 1852.0
#define KILOMETERS_TO_METERS 1000.0