/* Pick the minimum distance GeoFence using the algorithm given below */
static double GetNearestGeofenceDistance(Location location, double accuracy, List<Geofence> geofences, ref int minIndex)
{
double minDistance = double.MaxValue;
minIndex = -1;
for (int i = 0; i < geofences.Count; i++)
{
double distance = GetDistance(location, accuracy, geofences[i]);
if (distance < minDistance)
{
minDistance = distance;
minIndex = i;
}
}
return minDistance;
}
static HashSet<int> GetGeofencesSurrounding(Location location, List<Geofence> geofences)
{
HashSet<int> lst = new HashSet<int>();
for (int i = 0; i < geofences.Count; i++)
{
double distance = GetDistanceInKm(location, geofences[i].Location);
distance -= geofences[i].Radius;
if (distance < 0)
{
lst.Add(i);
}
}
return lst;
}
public static Location PerturbDataPointForWifi(Location location)
{
double deltaLat = Random.NextDouble() * 0.001;
double deltaLong = Random.NextDouble() * 0.001;
Location newLocation = new Location(location.Lat + deltaLat, location.Lng + deltaLong);
return newLocation;
}
/* Get distance from current location to centre of geofence */
static double GetDistance(Location location, double accuracy, Geofence geofence)
{
double distance = GetDistanceInKm(location, geofence.Location);
distance -= accuracy;
distance -= geofence.Radius;
return distance;
}
public static double GetDistanceInKm(Location l1, Location l2)
{
return GetDistanceInKm(l1.Lat, l1.Lng, l2.Lat, l2.Lng);
}