/**
* Created by Johannes Rudolph <johannes.rudolph@gmx.com> on 01.09.2016.
*/
/**
*
* @type {{fromLatLng: NAC.fromLatLng, _nac2Letter: NAC._nac2Letter}}
*/
var NAC = {
/**
*
* @param {{lat: number, lng: number}}
* @returns {string}
*/
fromLatLng: function(latlng) {
var lat = latlng.lat;
var lon = latlng.lng;
var x = [];
var y = [];
var xy = [];
xy.x = '';
xy.y = '';
if (lon >= -180 && lon <= 180) {
var xlon = (lon + 180) / 360;
x[0] = parseInt(xlon * 30);
x[1] = parseInt((xlon * 30 - x[0]) * 30);
x[2] = parseInt(((xlon * 30 - x[0]) * 30 - x[1]) * 30);
x[3] = parseInt((((xlon * 30 - x[0]) * 30 - x[1]) * 30 - x[2]) * 30);
x[4] = parseInt(((((xlon * 30 - x[0]) * 30 - x[1]) * 30 - x[2]) * 30 - x[3]) * 30);
x[5] = parseInt((((((xlon * 30 - x[0]) * 30 - x[1]) * 30 - x[2]) * 30 - x[3]) * 30 - x[4]) * 30);
} else {
x[0] = 0;
}
if (lat >= -90 && lat <= 90) {
var ylat = (lat + 90) / 180;
y[0] = parseInt(ylat * 30);
y[1] = parseInt((ylat * 30 - y[0]) * 30);
y[2] = parseInt(((ylat * 30 - y[0]) * 30 - y[1]) * 30);
y[3] = parseInt((((ylat * 30 - y[0]) * 30 - y[1]) * 30 - y[2]) * 30);
y[4] = parseInt(((((ylat * 30 - y[0]) * 30 - y[1]) * 30 - y[2]) * 30 - y[3]) * 30);
y[5] = parseInt((((((ylat * 30 - y[0]) * 30 - y[1]) * 30 - y[2]) * 30 - y[3]) * 30 - y[4]) * 30);
} else {
y[0] = 0;
}
for (var i = 0; i < x.length; i++) {
xy.x += this._nac2Letter(x[i]);
}
for (i = 0; i < y.length; i++) {
xy.y += this._nac2Letter(y[i]);
}
return xy;
},
/**
*
* @param number
* @returns {string}
* @private
*/
_nac2Letter: function(number){
var nac_letters = "0123456789BCDFGHJKLMNPQRSTVWXZ";
if(!isNaN(number) && number < 30)
return nac_letters.substr(number,1);
else return 0;
}
};