/// <summary>
/// Calculates bearing between start and stop.
/// </summary>
/// <param name="start">Start coordinates.</param>
/// <param name="stop">Stop coordinates.</param>
/// <returns>The <see cref="System.Double" />.</returns>
public static double BearingFrom(this Position start, Position stop)
{
var deltaLon = stop.Longitude - start.Longitude;
var cosStop = Math.Cos(stop.Latitude);
return Math.Atan2(
(Math.Cos(start.Latitude) * Math.Sin(stop.Latitude)) -
(Math.Sin(start.Latitude) * cosStop * Math.Cos(deltaLon)),
Math.Sin(deltaLon) * cosStop);
}
/// <summary>
/// Calculates distance between two locations.
/// </summary>
/// <param name="a">Location a</param>
/// <param name="b">Location b</param>
/// <returns>The <see cref="System.Double" />The distance in meters</returns>
public static double DistanceFrom(this Position a, Position b)
{
/*
double distance = Math.Acos(
(Math.Sin(a.Latitude) * Math.Sin(b.Latitude)) +
(Math.Cos(a.Latitude) * Math.Cos(b.Latitude))
* Math.Cos(b.Longitude - a.Longitude));
* */
var dLat = b.Latitude.DegreesToRadians() - a.Latitude.DegreesToRadians();
var dLon = b.Longitude.DegreesToRadians() - a.Longitude.DegreesToRadians();
var a1 = Math.Sin(dLat / 2) * Math.Sin(dLat / 2) + Math.Cos(a.Latitude.DegreesToRadians()) * Math.Cos(b.Latitude.DegreesToRadians()) * Math.Sin(dLon / 2) * Math.Sin(dLon / 2);
var distance = 2 * Math.Atan2(Math.Sqrt(a1), Math.Sqrt(1 - a1));
return EquatorRadius * distance;
}
/// <summary>
/// Initializes a new instance of the <see cref="Position" /> class.
/// </summary>
/// <param name="position">The position.</param>
/// <exception cref="System.ArgumentNullException">position</exception>
public Position(Position position)
{
if (position == null)
{
throw new ArgumentNullException("position");
}
Timestamp = position.Timestamp;
Latitude = position.Latitude;
Longitude = position.Longitude;
Altitude = position.Altitude;
AltitudeAccuracy = position.AltitudeAccuracy;
Accuracy = position.Accuracy;
Heading = position.Heading;
Speed = position.Speed;
}
/// <summary>
/// Initializes a new instance of the <see cref="PositionEventArgs"/> class.
/// </summary>
/// <param name="position">The position.</param>
/// <exception cref="System.ArgumentNullException">position</exception>
public PositionEventArgs(Position position)
{
if (position == null)
{
throw new ArgumentNullException("position");
}
Position = position;
}