/// <summary>
/// Calculates bearing between start and stop.
/// </summary>
/// <returns>The <see cref="System.Double"/>.</returns>
/// <param name="start">Start coordinates.</param>
/// <param name="stop">Stop coordinates.</param>
public static double BearingBetween(Coordinates start, Coordinates 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>
/// <returns>The <see cref="System.Double"/>The distance in meters</returns>
/// <param name="a">Location a</param>
/// <param name="b">Location b</param>
public static double DistanceBetween(Coordinates a, Coordinates 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));
return EquatorRadius * distance;
}
void locationMonitor_LocationChanged(object sender, Coordinates e)
{
try
{
this.db.Create(e);
}
catch (Exception ex)
{
ex.TryToStore(this.db, this);
}
}
void MainActivity_LocationChanged(object sender, Coordinates e)
{
this.textLocation.Text = string.Format("New location is {0}", e);
}
/// <summary>
/// Calculates this locations bearing to another coordicate.
/// </summary>
/// <returns>Bearing degree.</returns>
/// <param name="other">Other coordinates.</param>
public double BearingFrom(Coordinates other)
{
return BearingBetween(this, other);
}
/// <summary>
/// Calculates this locations distance to another coordicate.
/// </summary>
/// <returns>The distance to another coordicate</returns>
/// <param name="other">Other coordinates.</param>
public double DistanceFrom(Coordinates other)
{
return DistanceBetween(this, other);
}