// Calculate distance from each station to user.
private void calDists(GpsPos userPos, List <FreeStation2> fFullList)
{
foreach (var fcr in fFullList)
{
fcr.Dist = posDist(fcr, userPos);
}
}
// Distance using Pythagoras’ theorem.
public int posDist(GpsPos p1, GpsPos p2)
{
var lat1 = p1.Lat / 360;
var lat2 = p2.Lat / 360;
var lon1 = p1.Lon / 360;
var lon2 = p2.Lon / 360;
var y = lat2 - lat1;
var x = (lon2 - lon1) * Math.Cos((lat2 + lat1) / 2);
return((int)(earthRadius * Math.Sqrt(Math.Pow(x, 2) + Math.Pow(y, 2))));
}