//(CDLTLL) RefreshMap() with real data loading from services/mock is called only if VisibleRegion or Map-Zoom has changed
private async void ReloadMapInfo()
{
if (IsBusy)
{
return;
}
IsBusy = true;
if (_firstLocation == null)
{
_firstLocation = await GetLocation();
if (_firstLocation != null)
{
VisibleRegion = MapSpan.FromCenterAndRadius(new Position(_firstLocation.Latitude, _firstLocation.Longitude), VisibleRegion.Radius);
IsBusy = false;
return;
}
}
try
{
var distanceRadians =
DegreesToRadians(Math.Max(VisibleRegion.LatitudeDegrees, VisibleRegion.LongitudeDegrees) / 2);
var center = VisibleRegion.Center;
var halfheightDegrees = VisibleRegion.LatitudeDegrees / 2;
var halfwidthDegrees = VisibleRegion.LongitudeDegrees / 2;
var topLatitude = center.Latitude + halfheightDegrees;
var leftLongitude = center.Longitude - halfwidthDegrees;
var bottomLatitude = center.Latitude - halfheightDegrees;
var rightLongitude = center.Longitude + halfwidthDegrees;
// Adjust for Internation Date Line (+/- 180 degrees longitude)
if (leftLongitude < -180)
{
leftLongitude = 180 + (180 + leftLongitude);
}
if (rightLongitude > 180)
{
rightLongitude = (rightLongitude - 180) - 180;
}
// (CDLTLL) Query and obtain data from a real service or from the mock service depending on the injected implementation
var vehiclesInCurrentMapArea = await _vehiclesService.GetVehiclesInArea(this.UrlPrefix,
CurrentTenantId,
topLatitude,
leftLongitude,
bottomLatitude,
rightLongitude);
//(CDLTLL - Check this, not being used)
Vehicles = new ObservableCollection <Vehicle>(vehiclesInCurrentMapArea);
var pinsList = new List <ILocationViewModel>();
foreach (Vehicle vehicle in vehiclesInCurrentMapArea)
{
Vehicle localVehicle = vehicle;
pinsList.Add(new LocationViewModel
{
Key = vehicle.Id.ToString(),
Title = vehicle.Make + " " + vehicle.Model,
Latitude = vehicle.Latitude,
Longitude = vehicle.Longitude,
Description = "LicensePlate: " + vehicle.LicensePlate,
Command = new Command(() => DoneCommand.Execute(localVehicle))
});
}
//UpdatePins(pins);
if (Pins != null)
{
Pins.Clear();
}
Pins = new ObservableCollection <ILocationViewModel>(pinsList);
}
finally
{
IsBusy = false;
}
}