public Distance GetDistanceTo(Position other)
{
var d1 = this.Latitude * (Math.PI / 180.0);
var num1 = this.Longitude * (Math.PI / 180.0);
var d2 = other.Latitude * (Math.PI / 180.0);
var num2 = other.Longitude * (Math.PI / 180.0) - num1;
var d3 = Math.Pow(Math.Sin((d2 - d1) / 2.0), 2.0) +
Math.Cos(d1) * Math.Cos(d2) * Math.Pow(Math.Sin(num2 / 2.0), 2.0);
var meters = 6376500.0 * (2.0 * Math.Atan2(Math.Sqrt(d3), Math.Sqrt(1.0 - d3)));
return Distance.FromMeters(meters);
}
protected virtual CLLocationCoordinate2D ToNative(Position position)
{
return new CLLocationCoordinate2D(position.Latitude, position.Longitude);
}
public static bool IsPositionInside(this GeofenceRegion region, Position position)
{
var distance = region.Center.GetDistanceTo(position);
var inside = distance.TotalMeters <= region.Radius.TotalMeters;
return inside;
}