public double MilesTo(ParseGeoPoint point)
{
if (point == null)
{
throw new ArgumentNullException(nameof(point));
}
return(RadiansTo(point) * 3958.8);
}
public double KilometersTo(ParseGeoPoint point)
{
if (point == null)
{
throw new ArgumentNullException(nameof(point));
}
return(RadiansTo(point) * 6371.0);
}
public double RadiansTo(ParseGeoPoint point)
{
if (point == null)
{
throw new ArgumentNullException(nameof(point));
}
double d2r = Math.PI / 180.0;
double lat1rad = Latitude * d2r;
double long1rad = Longitude * d2r;
double lat2rad = point.Latitude * d2r;
double long2rad = point.Longitude * d2r;
double deltaLat = lat1rad - lat2rad;
double deltaLong = long1rad - long2rad;
double sinDeltaLatDiv2 = Math.Sin(deltaLat / 2);
double sinDeltaLongDiv2 = Math.Sin(deltaLong / 2);
double a = sinDeltaLatDiv2 * sinDeltaLatDiv2 +
Math.Cos(lat1rad) * Math.Cos(lat2rad) * sinDeltaLongDiv2 * sinDeltaLongDiv2;
a = Math.Min(1.0, a);
return(2 * Math.Sin(Math.Sqrt(a)));
}