public static double Bearing(double lat1, double long1, double lat2, double long2)
{
lat1 = Geodesy.DegToRad(lat1);
long1 = Geodesy.DegToRad(long1);
lat2 = Geodesy.DegToRad(lat2);
long2 = Geodesy.DegToRad(long2);
double num = long2 - long1;
return(Geodesy.ConvertToBearing(Geodesy.RadToDeg(Math.Atan2(Math.Sin(num) * Math.Cos(lat2), Math.Cos(lat1) * Math.Sin(lat2) - Math.Sin(lat1) * Math.Cos(lat2) * Math.Cos(num)))));
}
public static void UpdatePosition(int idx)
{
try
{
int count = pts2.Count;
if (count > 0 && idx <= count - 1)
{
string[] strArrays = Pos[idx].Split(new char[] { ';' });
if (!strArrays[0].ToUpper().StartsWith("N"))
{
strArrays[0] = string.Concat("-", strArrays[0].Substring(1));
}
else
{
strArrays[0] = strArrays[0].Substring(1);
}
if (!strArrays[1].ToUpper().StartsWith("W"))
{
strArrays[1] = strArrays[1].Substring(1);
}
else
{
strArrays[1] = string.Concat("-", strArrays[1].Substring(1));
}
if (idx > 2)
{
string[] strArrays1 = Pos[idx - 1].Split(new char[] { ';' });
if (!strArrays1[0].ToUpper().StartsWith("N"))
{
strArrays1[0] = string.Concat("-", strArrays1[0].Substring(1));
}
else
{
strArrays1[0] = strArrays1[0].Substring(1);
}
if (!strArrays1[1].ToUpper().StartsWith("W"))
{
strArrays1[1] = strArrays1[1].Substring(1);
}
else
{
strArrays1[1] = string.Concat("-", strArrays1[1].Substring(1));
}
LastLat = Convert.ToDouble(strArrays1[0]);
LastLng = Convert.ToDouble(strArrays1[1]);
if (LastLat != 0 && LastLng != 0)
{
double num = CalcDist(new PointLatLng(LastLat, LastLng), new PointLatLng(Convert.ToDouble(strArrays[0]), Convert.ToDouble(strArrays[1])));
double num1 = num * 5280 * 0.681818 * 0.621371;
CompassBearing = (int)Geodesy.Bearing(LastLat, LastLng, Convert.ToDouble(strArrays[0]), Convert.ToDouble(strArrays[1]));
compass.SetData((int)num1, CompassBearing);
}
}
PointLatLng pointLatLng = new PointLatLng(Convert.ToDouble(strArrays[0]), Convert.ToDouble(strArrays[1]));
mainMap.Overlays.Clear();
Markers.Markers.Clear();
GMapMarker gMapMarkerGoogleGreen = new GMapMarkerGoogleGreen(mainMap.Position);
Markers.Markers.Add(gMapMarkerGoogleGreen);
mainMap.Overlays.Add(Markers);
mainMap.Position = pointLatLng;
}
}
catch (Exception exception)
{
}
}