public Boolean CanWriteToList(LocationModel model)
{
if (ListItemsSource.Count == 0) return true;
var firstItem = ListItemsSource.First();
var oldLat = firstItem.coords.latitude;
var oldLon = firstItem.coords.longitude;
double oldLatitude;
double oldLongitude;
Double.TryParse(oldLat, out oldLatitude);
Double.TryParse(oldLon, out oldLongitude);
var newLat = model.coords.latitude;
var newLon = model.coords.longitude;
double newLongitude;
double newLatitude;
Double.TryParse(newLat, out newLatitude);
Double.TryParse(newLon, out newLongitude);
var distance = Math.Sqrt(Math.Pow((newLongitude - oldLongitude), 2) + Math.Pow((newLatitude - oldLatitude), 2)) >= MinLength;
var timespan = (model.timestamp - firstItem.timestamp) >= MinTime;
return distance || timespan;
}
public static LocationModel SetLocationCoordinates(PositionChangedEventArgs args)
{
var locationModel = new LocationModel()
{
coords = new PositionModel()
};
var coordinates = args.Position.Coordinate;
locationModel.coords.latitude = coordinates.Latitude.ToString();
locationModel.coords.longitude = coordinates.Longitude.ToString();
locationModel.coords.altitudeAccuracy = coordinates.AltitudeAccuracy.ToString();
locationModel.coords.altitude = coordinates.Altitude.ToString();
locationModel.coords.accuracy = coordinates.Accuracy.ToString();
locationModel.coords.speed = coordinates.Speed.ToString();
locationModel.coords.heading = coordinates.Heading.ToString();
locationModel.timestamp = ToUnixTimestamp(DateTime.Now);
return locationModel;
}
public void ReceivePositionCoordinates(LocationModel model)
{
Deployment.Current.Dispatcher.BeginInvoke(() =>
{
TextMessage = string.Format("{0} {1}", model.coords.latitude, model.coords.longitude);
});
var canWrite = CanWriteToList(model);
if (!canWrite) return;
ListItemsSource.Add(model);
SendRequest.SendPositionRequest();
}