#include <string.h>
#include <grass/gis.h>
#include <grass/raster.h>
#include <grass/display.h>
#include "local_proto.h"

static int max (int a, int b) {return a>b?a:b;}

int make_window_center (struct Cell_head *window, double magnify, double east, double north)
{
    char buffer[64] ;
    double east_west, north_south;
    int len_n, len_e;

    len_n = len_e = 0;

    if (east < 0.0 && north < 0.0)
    {
      east = (window->east + window->west)/2.;
      north = (window->north + window->south)/2.;
    }

    east_west = (window->east - window->west)/magnify;
    window->east =  east + east_west/2;
    window->west =  east - east_west/2;
    if (window->proj == PROJECTION_LL){
	if (east_west>360){
	    window->east =  east + 180;
	    window->west =  east - 180;
	}
	window->east = G_adjust_easting (window->east, window);
    }

    north_south = (window->north - window->south)/magnify;
    window->north =  north + north_south/2;
    window->south =  north - north_south/2;
    G_limit_south (&window->south, window->proj);
    G_limit_north (&window->north, window->proj);

    G_format_easting(window->east, buffer, window->proj)  ;
    G_format_easting(window->west, buffer, window->proj)  ;
    G_format_northing(window->north, buffer, window->proj)  ;
    G_format_northing(window->south, buffer, window->proj)  ;

    return 0;
}