private double measurePositionDelta(RoutePoint one, RoutePoint two)
{
var lat1 = one.Lat;
var lon1 = one.Lon;
var lat2 = two.Lat;
var lon2 = two.Lon;
var R = 6378.137; // Radius of earth in KM
var dLat = lat2 * Math.PI / 180 - lat1 * Math.PI / 180;
var dLon = lon2 * Math.PI / 180 - lon1 * Math.PI / 180;
var a = Math.Sin(dLat / 2) * Math.Sin(dLat / 2) +
Math.Cos(lat1 * Math.PI / 180) * Math.Cos(lat2 * Math.PI / 180) *
Math.Sin(dLon / 2) * Math.Sin(dLon / 2);
var c = 2 * Math.Atan2(Math.Sqrt(a), Math.Sqrt(1 - a));
var d = R * c;
return(d * 1000); // meters
}
public static List <RoutePoint> DecodeGooglePolyline_Alternative(string encodedPoints)
{
if (encodedPoints == null || encodedPoints == "")
{
return(null);
}
List <RoutePoint> poly = new List <RoutePoint>();
char[] polylinechars = encodedPoints.ToCharArray();
int index = 0;
int currentLat = 0;
int currentLng = 0;
int next5bits;
int sum;
int shifter;
try
{
while (index < polylinechars.Length)
{
// calculate next latitude
sum = 0;
shifter = 0;
do
{
next5bits = (int)polylinechars[index++] - 63;
sum |= (next5bits & 31) << shifter;
shifter += 5;
} while (next5bits >= 32 && index < polylinechars.Length);
if (index >= polylinechars.Length)
{
break;
}
currentLat += (sum & 1) == 1 ? ~(sum >> 1) : (sum >> 1);
//calculate next longitude
sum = 0;
shifter = 0;
do
{
next5bits = (int)polylinechars[index++] - 63;
sum |= (next5bits & 31) << shifter;
shifter += 5;
} while (next5bits >= 32 && index < polylinechars.Length);
if (index >= polylinechars.Length && next5bits >= 32)
{
break;
}
currentLng += (sum & 1) == 1 ? ~(sum >> 1) : (sum >> 1);
RoutePoint p = new RoutePoint();
p.Lat = Convert.ToDouble(currentLat) / 1000000.0;
p.Lon = Convert.ToDouble(currentLng) / 1000000.0;
poly.Add(p);
}
}
catch (Exception ex)
{
// logo it
}
return(poly);
}
