/// <summary>
/// Perform the reverse geocode using the ReverseGeocodingCloudClient and update the UI
/// </summary>
private async void PerformReverseGeocode()
{
// Perform some simple validation on the input text boxes
if (await ValidateSearchParameters())
{
CloudReverseGeocodingOptions options = new CloudReverseGeocodingOptions();
// Set up the CloudReverseGeocodingOptions object based on the parameters set in the UI
string[] coordinates = txtCoordinates.Text.Split(',');
double lat = double.Parse(coordinates[0].Trim());
double lon = double.Parse(coordinates[1].Trim());
int searchRadius = int.Parse(txtSearchRadius.Text);
DistanceUnit searchRadiusDistanceUnit = DistanceUnit.Meter;
int pointProjectionInSrid = 3857;
PointShape searchPoint = new PointShape(lon, lat);
options.MaxResults = int.Parse(txtMaxResults.Text);
switch ((string)cboLocationCategories.SelectedItem)
{
case "All":
options.LocationCategories = CloudLocationCategories.All;
break;
case "Common":
options.LocationCategories = CloudLocationCategories.Common;
break;
case "None":
options.LocationCategories = CloudLocationCategories.None;
break;
default:
options.LocationCategories = CloudLocationCategories.All;
break;
}
// Show a loading graphic to let users know the request is running
loadingIndicator.IsRunning = true;
loadingLayout.IsVisible = true;
// Run the reverse geocode
CloudReverseGeocodingResult searchResult = await reverseGeocodingCloudClient.SearchPointAsync(lon, lat, pointProjectionInSrid, searchRadius, searchRadiusDistanceUnit, options);
// Hide the loading graphic
loadingIndicator.IsRunning = false;
loadingLayout.IsVisible = false;
// Handle an exception returned from the service
if (searchResult.Exception != null)
{
await DisplayAlert("Alert", searchResult.Exception.Message, "Error");
return;
}
// Update the UI
DisplaySearchResults(searchPoint, searchRadius, searchResult);
}
}
/// <summary>
/// Update the UI based on the search results from the reverse geocode
/// </summary>
private void DisplaySearchResults(PointShape searchPoint, int searchRadius, CloudReverseGeocodingResult searchResult)
{
// Get the 'Search Radius' layer from the MapView
InMemoryFeatureLayer searchRadiusFeatureLayer = (InMemoryFeatureLayer)mapView.FindFeatureLayer("Search Radius");
// Clear the existing features and add new features showing the area that was searched by the reverse geocode
searchRadiusFeatureLayer.Clear();
searchRadiusFeatureLayer.InternalFeatures.Add(new Feature(new EllipseShape(searchPoint, searchRadius)));
searchRadiusFeatureLayer.InternalFeatures.Add(new Feature(searchPoint));
// Get the 'Result Feature' layer and clear it
InMemoryFeatureLayer selectedResultItemFeatureLayer = (InMemoryFeatureLayer)mapView.FindFeatureLayer("Result Feature Geometry");
selectedResultItemFeatureLayer.Clear();
// If a match was found for the geocode, update the UI
if (searchResult?.BestMatchLocation != null)
{
// Get the 'Best Match' PopupOverlay from the MapView and clear it
PopupOverlay bestMatchPopupOverlay = (PopupOverlay)mapView.Overlays["Best Match Popup Overlay"];
bestMatchPopupOverlay.Popups.Clear();
// Get the location of the 'Best Match' found within the search radius
PointShape bestMatchLocation = searchResult.BestMatchLocation.LocationFeature.GetShape().GetClosestPointTo(searchPoint, GeographyUnit.Meter);
if (bestMatchLocation == null)
{
bestMatchLocation = searchResult.BestMatchLocation.LocationFeature.GetShape().GetCenterPoint();
}
// Create a popup to display the best match, and add it to the PopupOverlay
Popup bestMatchPopup = new Popup();
bestMatchPopup.Content = "Best Match: " + searchResult.BestMatchLocation.LocationName;
bestMatchPopup.Position = bestMatchLocation;
bestMatchPopupOverlay.Popups.Add(bestMatchPopup);
// Sort the locations found into three groups (Addresses, Places, Roads) based on their LocationCategory
Collection <CloudReverseGeocodingLocation> nearbyLocations = new Collection <CloudReverseGeocodingLocation>(searchResult.NearbyLocations);
Collection <CloudReverseGeocodingLocation> nearbyAddresses = new Collection <CloudReverseGeocodingLocation>();
Collection <CloudReverseGeocodingLocation> nearbyPlaces = new Collection <CloudReverseGeocodingLocation>();
Collection <CloudReverseGeocodingLocation> nearbyRoads = new Collection <CloudReverseGeocodingLocation>();
foreach (CloudReverseGeocodingLocation foundLocation in nearbyLocations)
{
if (foundLocation.LocationCategory.ToLower().Contains("addresspoint"))
{
nearbyAddresses.Add(foundLocation);
}
else if (nameof(CloudLocationCategories.Aeroway).Equals(foundLocation.LocationCategory) ||
nameof(CloudLocationCategories.Road).Equals(foundLocation.LocationCategory) ||
nameof(CloudLocationCategories.Rail).Equals(foundLocation.LocationCategory) ||
nameof(CloudLocationCategories.Waterway).Equals(foundLocation.LocationCategory))
{
nearbyRoads.Add(foundLocation);
}
else if (!nameof(CloudLocationCategories.Intersection).Equals(foundLocation.LocationCategory))
{
nearbyPlaces.Add(foundLocation);
}
}
// Set the data sources for the addresses, roads, and places list boxes
lsbAddresses.ItemsSource = nearbyAddresses;
lsbRoads.ItemsSource = nearbyRoads;
lsbPlaces.ItemsSource = nearbyPlaces;
lsbPlaces.IsVisible = true;
txtSearchResultsBestMatch.Text = "Best Match: " + searchResult.BestMatchLocation.Address;
}
else
{
txtSearchResultsBestMatch.Text = "No address or place matches found for this location";
}
// Set the map extent to show the results of the search
mapView.CurrentExtent = RectangleShape.ScaleUp(searchRadiusFeatureLayer.GetBoundingBox(), 20).GetBoundingBox();
mapView.Refresh();
}