public TripLength CalculateDistance(Location startLocation, Location endLocation, TimeSpan startTime)
{
var startLocationDomain = _mapperService.MapModelToDomain(startLocation);
startLocationDomain.Latitude = startLocation.Latitude;
startLocationDomain.Longitude = startLocation.Longitude;
var endLocationDomain = _mapperService.MapModelToDomain(endLocation);
endLocationDomain.Latitude = endLocation.Latitude;
endLocationDomain.Longitude = endLocation.Longitude;
var locationDistance = _locationDistanceService.Get(startLocationDomain, endLocationDomain);
TripLength result;
if (locationDistance != null)
{
var hourIndex = (int)startTime.TotalHours;
while (hourIndex >= 24)
{
hourIndex = hourIndex - 24;
}
long travelTime = locationDistance.Hours[hourIndex].TravelTime.Value;
if (travelTime == 0 && locationDistance.TravelTime.HasValue)
{
travelTime = locationDistance.TravelTime.Value;
}
long distance = 0;
if (locationDistance.Distance.HasValue)
{
distance = (long)locationDistance.Distance.Value;
}
result = new TripLength(distance, TimeSpan.FromSeconds(travelTime));
}
else
{
// Use fallback service
result = _fallbackDistanceService.CalculateDistance(startLocation, endLocation, startTime);
}
return(result);
}
/// <summary>
/// Calculates the toal route statistics a list of route stops
/// </summary>
/// <param name="stops"></param>
/// <returns></returns>
public TripLength CalculateTripLength(IList <RouteStop> stops)
{
var result = new TripLength();
for (int i = 0; i < stops.Count - 1; i++)
{
// calculate the trip between the current and next stop
var currentStop = stops[i];
var nextStop = stops[i + 1];
var tripLength = CalculateTripLength(currentStop, nextStop);
result += tripLength;
}
return(result);
}
/// <summary>
/// Calculates the taxi cab trip length
/// </summary>
/// <param name="startLocation"></param>
/// <param name="endLocation"></param>
/// <returns></returns>
public TripLength CalculateTaxicabDistance(Location startLocation, Location endLocation)
{
double lon1 = startLocation.Longitude;
double lat1 = startLocation.Latitude;
double lon2 = endLocation.Longitude;
double lat2 = endLocation.Latitude;
double maxLat = Math.Max(lat1, lat2);
double k = Math.Cos(Radians(maxLat));
var distance = 69.172 * (Math.Abs(lat2 - lat1) + k * Math.Abs(lon2 - lon1));
var result = new TripLength()
{
Distance = (decimal)distance,
Time = _travelTimeEstimator.CalculateTravelTime(distance)
};
return(result);
}
/// <summary>
/// calculates the euclidian trip length
/// </summary>
/// <param name="startLocation"></param>
/// <param name="endLocation"></param>
/// <returns></returns>
public TripLength CalculateEuclidianDistance(Location startLocation, Location endLocation)
{
double lon1 = startLocation.Longitude;
double lat1 = startLocation.Latitude;
double lon2 = endLocation.Longitude;
double lat2 = endLocation.Latitude;
double dlon = Radians(lon2 - lon1);
double dlat = Radians(lat2 - lat1);
double a = (Math.Sin(dlat / 2) * Math.Sin(dlat / 2)) +
Math.Cos(Radians(lat1)) * Math.Cos(Radians(lat2)) * (Math.Sin(dlon / 2) * Math.Sin(dlon / 2));
double angle = 2 * Math.Atan2(Math.Sqrt(a), Math.Sqrt(1 - a));
var distance = angle * EarthRadius;
var result = new TripLength()
{
Distance = (decimal)distance,
Time = _travelTimeEstimator.CalculateTravelTime(distance)
};
return(result);
}
