/// <summary>
/// Calculate the distance between two points using the "haversine" formula.
/// The formula is based on http://mathforum.org/library/drmath/view/51879.html
/// </summary>
/// <param name="start">the starting point</param>
/// <param name="end">the end point</param>
/// <returns>the distance between the points in meters</returns>
public static double GetDistance(this Point start, Point end)
{
int r = 6371000; // earth radius in metres
double lat1 = ToRadians(start.GetLatitude());
double lat2 = ToRadians(end.GetLatitude());
double lon1 = ToRadians(start.GetLongitude());
double lon2 = ToRadians(end.GetLongitude());
double deltalat = lat2 - lat1;
double deltalon = lon2 - lon1;
double a = Math.Sin(deltalat / 2) * Math.Sin(deltalat / 2) + Math.Cos(lat1) * Math.Cos(lat2) * Math.Sin(deltalon / 2) * Math.Sin(deltalon / 2);
double c = 2 * Math.Atan2(Math.Sqrt(a), Math.Sqrt(1 - a));
return(r * c);
}
/// <summary>
/// Calculate the distance between two points using the "haversine" formula.
/// This code was taken from http://www.movable-type.co.uk/scripts/latlong.html.
/// </summary>
/// <param name="start">the starting point</param>
/// <param name="end">the end point</param>
/// <returns>the distance between the points in meters</returns>
public static double GetDistance(this Point start, Point end)
{
double lat1 = start.GetLatitude();
double lat2 = end.GetLatitude();
double lon1 = start.GetLongitude();
double lon2 = end.GetLongitude();
int r = 6371000; // metres
double phi1 = ToRadians(lat1);
double phi2 = ToRadians(lat2);
double deltaPhi = ToRadians(lat2 - lat1);
double deltaLambda = ToRadians(lon2 - lon1);
double a = Math.Sin(deltaPhi / 2) * Math.Sin(deltaPhi / 2) + Math.Cos(phi1) * Math.Cos(phi2) * Math.Sin(deltaLambda / 2) * Math.Sin(deltaLambda / 2);
double c = 2 * Math.Atan2(Math.Sqrt(a), Math.Sqrt(1 - a));
return(r * c);
}
/// <summary>
/// Client-streaming example. Sends numPoints randomly chosen points from features
/// with a variable delay in between. Prints the statistics when they are sent from the server.
/// </summary>
public async Task RecordRoute(List <Feature> features, int numPoints)
{
try
{
Log("*** RecordRoute");
using (var call = client.RecordRoute())
{
// Send numPoints points randomly selected from the features list.
StringBuilder numMsg = new StringBuilder();
Random rand = new Random();
for (int i = 0; i < numPoints; ++i)
{
int index = rand.Next(features.Count);
Point point = features[index].Location;
Log("Visiting point {0}, {1}", point.GetLatitude(), point.GetLongitude());
await call.RequestStream.WriteAsync(point);
// A bit of delay before sending the next one.
await Task.Delay(rand.Next(1000) + 500);
}
await call.RequestStream.CompleteAsync();
RouteSummary summary = await call.ResponseAsync;
Log("Finished trip with {0} points. Passed {1} features. "
+ "Travelled {2} meters. It took {3} seconds.", summary.PointCount,
summary.FeatureCount, summary.Distance, summary.ElapsedTime);
Log("Finished RecordRoute");
}
}
catch (RpcException e)
{
Log("RPC failed", e);
throw;
}
}