/// <summary>
/// Initializes a new instance of the <see cref="T:Locator.Portable.ViewModels.MapPageViewModel"/> class.
/// </summary>
/// <param name="navigation">Navigation.</param>
/// <param name="geolocator">Geolocator.</param>
/// <param name="commandFactory">Command factory.</param>
/// <param name="geocodingWebServiceController">Geocoding repository.</param>
public MapPageViewModel(INavigationService navigation, IGeolocator geolocator, Func <Action, ICommand> commandFactory,
IGeocodingWebServiceController geocodingWebServiceController) : base(navigation)
{
_geolocator = geolocator;
_geocodingWebServiceController = geocodingWebServiceController;
_nearestAddressCommand = commandFactory(() => FindNearestSite());
_geolocationCommand = commandFactory(() =>
{
if (_geolocationUpdating)
{
geolocator.Stop();
}
else
{
geolocator.Start();
}
GeolocationButtonTitle = _geolocationUpdating ? "Start" : "Stop";
_geolocationUpdating = !_geolocationUpdating;
});
_positions = new List <IPosition> ();
LocationUpdates = new Subject <IPosition> ();
ClosestUpdates = new Subject <IPosition> ();
}
/// <summary>
/// Finds the nearest site.
/// </summary>
private void FindNearestSite()
{
if (_geolocationUpdating)
{
_geolocationUpdating = false;
_geolocator.Stop();
GeolocationButtonTitle = "Start";
}
double mindif = 99999;
IPosition closest = null;
var closestIndex = 0;
var index = 0;
if (_currentPosition != null)
{
foreach (var position in _positions)
{
var difference = PythagorasEquirectangular(_currentPosition.Latitude, _currentPosition.Longitude,
position.Latitude, position.Longitude);
if (difference < mindif)
{
closest = position;
closestIndex = index;
mindif = difference;
}
index++;
}
if (closest != null)
{
var array = _addresses[closestIndex];
Address = string.Format("{0}, {1}, {2}", array[0], array[1], array[2]);
ClosestUpdates.OnNext(closest);
}
}
}