/// <summary>
///Calculates the distance between two lat/lng's in miles or meters.
/// </summary>
/// <param name="ll2">Second lat,lng position to calculate distance to.</param>
/// <param name="lUnits">Units to calculate distance, defaults to miles</param>
/// <returns>Returns the distance in meters or miles</returns>
public double ArcDistance(LatLng ll2, DistanceUnits lUnits)
{
LatLng ll1 = Normalize();
ll2 = ll2.Normalize();
double lat1 = ll1.GetLat(), lng1 = ll1.GetLng();
double lat2 = ll2.GetLat(), lng2 = ll2.GetLng();
// Check for same position
if (lat1 == lat2 && lng1 == lng2)
{
return(0.0);
}
// Get the m_dLongitude difference. Don't need to worry about
// crossing 180 since cos(x) = cos(-x)
double dLon = lng2 - lng1;
double a = Radians(90.0 - lat1);
double c = Radians(90.0 - lat2);
double cosB = (Math.Cos(a) * Math.Cos(c))
+ (Math.Sin(a) * Math.Sin(c) * Math.Cos(Radians(dLon)));
double radius = (lUnits == DistanceUnits.MILES) ? 3963.205 /* MILERADIUSOFEARTH */ : 6378.160187
/* KMRADIUSOFEARTH */;
// Find angle subtended (with some bounds checking) in radians and
// multiply by earth radius to find the arc distance
if (cosB < -1.0)
{
return(MathHelper.PI * radius);
}
if (cosB >= 1.0)
{
return(0);
}
return(Math.Acos(cosB) * radius);
}
public FloatLatLng(LatLng ll)
{
_lat = ll.GetLat();
_lng = ll.GetLng();
}
public override LatLng CalculateMidpoint(LatLng other)
{
return(new FloatLatLng((_lat + other.GetLat()) / 2.0, (_lng + other.GetLng()) / 2.0));
}
public FloatLatLng(LatLng ll)
{
_lat = ll.GetLat();
_lng = ll.GetLng();
}
public override LatLng CalculateMidpoint(LatLng other)
{
return new FloatLatLng((_lat + other.GetLat()) / 2.0, (_lng + other.GetLng()) / 2.0);
}
/// <summary>
///Calculates the distance between two lat/lng's in miles or meters.
/// </summary>
/// <param name="ll2">Second lat,lng position to calculate distance to.</param>
/// <param name="lUnits">Units to calculate distance, defaults to miles</param>
/// <returns>Returns the distance in meters or miles</returns>
public double ArcDistance(LatLng ll2, DistanceUnits lUnits)
{
LatLng ll1 = Normalize();
ll2 = ll2.Normalize();
double lat1 = ll1.GetLat(), lng1 = ll1.GetLng();
double lat2 = ll2.GetLat(), lng2 = ll2.GetLng();
// Check for same position
if (lat1 == lat2 && lng1 == lng2)
return 0.0;
// Get the m_dLongitude difference. Don't need to worry about
// crossing 180 since cos(x) = cos(-x)
double dLon = lng2 - lng1;
double a = Radians(90.0 - lat1);
double c = Radians(90.0 - lat2);
double cosB = (Math.Cos(a) * Math.Cos(c))
+ (Math.Sin(a) * Math.Sin(c) * Math.Cos(Radians(dLon)));
double radius = (lUnits == DistanceUnits.MILES) ? 3963.205 /* MILERADIUSOFEARTH */ : 6378.160187
/* KMRADIUSOFEARTH */;
// Find angle subtended (with some bounds checking) in radians and
// multiply by earth radius to find the arc distance
if (cosB < -1.0) return MathHelper.PI * radius;
if (cosB >= 1.0) return 0;
return Math.Acos(cosB) * radius;
}
