public string GetNearestPoint(DateTime startDate, DateTime endDate, LatLong point, int queryFor)
{
using (TaxiDataEntities context = new TaxiDataEntities())
{
//create the point to look for given by the latlong object
SqlGeography sqlPoint = CreatePoint(point);
//initialize return list and the initial distance to search in
List<QueryDto> returnVal = new List<QueryDto>();
int initialDistance = 10;
//starting from the initialDistance search for a trip and expand the search distance until
//a point is found. The max is 100000 meters which is around 62 miles which is sufficient for this project
while (returnVal.Count() == 0 && initialDistance < 100000)
{
returnVal = context.NearestPointQuery(startDate, endDate, initialDistance, sqlPoint.ToString(), queryFor)
.Select(x => new QueryDto
{
Pickup = new LatLong
{
Latitude = (double)x.pickup_latitude,
Longitude = (double)x.pickup_longitude
},
Dropoff = new LatLong
{
Latitude = (double)x.dropoff_latitude,
Longitude = (double)x.dropoff_longitude
},
FareTotal = x.total_amount,
TravelTime = x.trip_time_in_secs,
NumOfPassenger = x.passenger_count,
TripDistance = x.trip_distance
}).ToList();
initialDistance *= 2;
}
return JsonConvert.SerializeObject(new QueryDto[] {returnVal.First()});
}
}
