/// <summary>
/// Set up the map with the ThinkGeo Cloud Maps overlay and a feature layers for the shape to be queried and the returned elevation points
/// </summary>
protected override async void OnAppearing()
{
base.OnAppearing();
// Create the background world maps using vector tiles requested from the ThinkGeo Cloud Service.
ThinkGeoCloudVectorMapsOverlay thinkGeoCloudVectorMapsOverlay = new ThinkGeoCloudVectorMapsOverlay("9ap16imkD_V7fsvDW9I8r8ULxgAB50BX_BnafMEBcKg~", "vtVao9zAcOj00UlGcK7U-efLANfeJKzlPuDB9nw7Bp4K4UxU_PdRDg~~", ThinkGeoCloudVectorMapsMapType.Light);
thinkGeoCloudVectorMapsOverlay.VectorTileCache = new FileVectorTileCache(Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData), "cache"), "CloudMapsVector");
mapView.Overlays.Add(thinkGeoCloudVectorMapsOverlay);
// Set the map's unit of measurement to meters (Spherical Mercator)
mapView.MapUnit = GeographyUnit.Meter;
// Create a new InMemoryFeatureLayer to hold the shape drawn for the elevation query
InMemoryFeatureLayer drawnShapeLayer = new InMemoryFeatureLayer();
// Create Point, Line, and Polygon styles to display the drawn shape, and apply them across all zoom levels
drawnShapeLayer.ZoomLevelSet.ZoomLevel01.DefaultPointStyle = new PointStyle(PointSymbolType.Star, 20, GeoBrushes.Blue);
drawnShapeLayer.ZoomLevelSet.ZoomLevel01.DefaultLineStyle = new LineStyle(GeoPens.Blue);
drawnShapeLayer.ZoomLevelSet.ZoomLevel01.DefaultAreaStyle = new AreaStyle(GeoPens.Blue, new GeoSolidBrush(new GeoColor(10, GeoColors.Blue)));
drawnShapeLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
// Create a new InMemoryFeatureLayer to display the elevation points returned from the query
InMemoryFeatureLayer elevationPointsLayer = new InMemoryFeatureLayer();
// Create a point style for the elevation points
elevationPointsLayer.ZoomLevelSet.ZoomLevel01.DefaultPointStyle = new PointStyle(PointSymbolType.Star, 20, GeoBrushes.Blue);
elevationPointsLayer.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
// Add the feature layers to an overlay, and add the overlay to the map
LayerOverlay elevationFeaturesOverlay = new LayerOverlay();
elevationFeaturesOverlay.Layers.Add("Elevation Points Layer", elevationPointsLayer);
elevationFeaturesOverlay.Layers.Add("Drawn Shape Layer", drawnShapeLayer);
mapView.Overlays.Add("Elevation Features Overlay", elevationFeaturesOverlay);
// Add an event to trigger the elevation query when a new shape is drawn
mapView.TrackOverlay.TrackEnded += OnShapeDrawn;
// Initialize the ElevationCloudClient with our ThinkGeo Cloud credentials
elevationCloudClient = new ElevationCloudClient("9ap16imkD_V7fsvDW9I8r8ULxgAB50BX_BnafMEBcKg~", "vtVao9zAcOj00UlGcK7U-efLANfeJKzlPuDB9nw7Bp4K4UxU_PdRDg~~");
// Create a sample line and get elevation along that line
LineShape sampleShape = new LineShape("LINESTRING(-10776298.0601626 3912306.29684573,-10776496.3187036 3912399.45447343,-10776675.4679876 3912478.28015841,-10776890.4471285 3912516.49867234,-10777189.0292686 3912509.33270098,-10777329.9600387 3912442.4503016,-10777664.3720356 3912174.92070409)");
// Set the map extent to Frisco, TX
mapView.CurrentExtent = sampleShape.GetBoundingBox();
await PerformElevationQuery(sampleShape);
mapView.Refresh();
}
private static void GetAdjacentFeataureIds(FeatureSource featureSource, LineShape sourceShape, Collection <string> startIds, Collection <string> endIds)
{
Vertex startVertex = sourceShape.Vertices[0];
Vertex endVertex = sourceShape.Vertices[sourceShape.Vertices.Count - 1];
Collection <Feature> tempfeatures = featureSource.GetFeaturesInsideBoundingBox(sourceShape.GetBoundingBox(), ReturningColumnsType.NoColumns);
foreach (Feature tempFeature in tempfeatures)
{
LineShape tempShape = ((MultilineShape)tempFeature.GetShape()).Lines[0];
if (sourceShape.Id == tempFeature.Id)
{
continue;
}
if (tempShape.Vertices.Contains(startVertex))
{
startIds.Add(tempFeature.Id);
}
else if (tempShape.Vertices.Contains(endVertex))
{
endIds.Add(tempFeature.Id);
}
}
}