protected override void OnCreate(Android.OS.Bundle savedInstanceState) { base.OnCreate(savedInstanceState); AddOnlineBaseLayer(CartoBaseMapStyle.CartoBasemapStylePositron); // read json from assets and add to map string json; using (System.IO.StreamReader sr = new System.IO.StreamReader(Assets.Open("cities15000.geojson"))) { json = sr.ReadToEnd(); } // Initialize a local vector data source LocalVectorDataSource source = new LocalVectorDataSource(BaseProjection); // Initialize a vector layer with the previous data source ClusteredVectorLayer layer = new ClusteredVectorLayer(source, new MyClusterElementBuilder(this)); layer.MinimumClusterDistance = 50; new System.Threading.Thread((obj) => { // Create a basic style, as the ClusterElementBuilder will set the real style var markerStyleBuilder = new MarkerStyleBuilder(); markerStyleBuilder.Size = 14; MarkerStyle style = markerStyleBuilder.BuildStyle(); // Read GeoJSON, parse it using SDK GeoJSON parser GeoJSONGeometryReader reader = new GeoJSONGeometryReader(); // Set target projection to base (mercator) reader.TargetProjection = BaseProjection; Alert("Starting load from .geojson"); // Read features from local asset FeatureCollection features = reader.ReadFeatureCollection(json); Alert("Finished load from .geojson"); VectorElementVector elements = new VectorElementVector(); for (int i = 0; i < features.FeatureCount; i++) { // This data set features point geometry, // however, it can also be LineGeometry or PolygonGeometry PointGeometry geometry = (PointGeometry)features.GetFeature(i).Geometry; elements.Add(new Marker(geometry, style)); } source.AddAll(elements); Alert("Clustering started. Please wait..."); // Add the clustered vector layer to the map MapView.Layers.Add(layer); }).Start(); }
public override void ViewDidAppear(bool animated) { base.ViewDidAppear(animated); // Add default base layer AddOnlineBaseLayer(CartoBaseMapStyle.CartoBasemapStylePositron); // Initialize a local vector data source LocalVectorDataSource source = new LocalVectorDataSource(BaseProjection); // Initialize a vector layer with the previous data source var layer = new ClusteredVectorLayer(source, new MyClusterElementBuilder()); // Default is 100. A good value depends on data layer.MinimumClusterDistance = 50; // read json from assets and add to map string json = System.IO.File.ReadAllText(AssetUtils.CalculateResourcePath("cities15000.geojson")); // Create a basic style, as the ClusterElementBuilder will set the real style var markerStyleBuilder = new MarkerStyleBuilder(); markerStyleBuilder.Size = 14; MarkerStyle style = markerStyleBuilder.BuildStyle(); // Read GeoJSON, parse it using SDK GeoJSON parser GeoJSONGeometryReader reader = new GeoJSONGeometryReader(); // Set target projection to base (mercator) reader.TargetProjection = BaseProjection; // Read features from local asset FeatureCollection features = reader.ReadFeatureCollection(json); VectorElementVector elements = new VectorElementVector(); for (int i = 0; i < features.FeatureCount; i++) { // This data set features point geometry, // however, it can also be LineGeometry or PolygonGeometry PointGeometry geometry = (PointGeometry)features.GetFeature(i).Geometry; elements.Add(new Marker(geometry, style)); } // Add the clustered vector layer to the map source.AddAll(elements); MapView.Layers.Add(layer); }
public static void addJosnLayer(IMapView mapView, String json) { var features = Newtonsoft.Json.Linq.JObject.Parse(json)["features"]; var geoJsonParser = new GeoJSONGeometryReader(); var proj = new EPSG3857(); var balloonPopupStyleBuilder = new BalloonPopupStyleBuilder(); // Create overlay layer for markers var dataSource = new LocalVectorDataSource(proj); var overlayLayer = new ClusteredVectorLayer(dataSource, new MyClusterElementBuilder()); overlayLayer.MinimumClusterDistance = 80; // in pixels mapView.Layers.Add(overlayLayer); foreach (var feature in features) { var featureType = feature ["type"]; var geometry = feature ["geometry"]; var ntGeom = geoJsonParser.ReadGeometry(Newtonsoft.Json.JsonConvert.SerializeObject(geometry)); var popup = new BalloonPopup( ntGeom, balloonPopupStyleBuilder.BuildStyle(), (string)feature ["properties"]["Capital"], (string)feature ["properties"]["Country"]); var properties = (JObject)feature ["properties"]; foreach (var property in properties) { var key = (string)property.Key; var value = (string)property.Value; popup.SetMetaDataElement(key, value); } dataSource.Add(popup); } }
public static void AddJsonLayer(IMapView mapView, string json) { var features = new Carto.Geometry.GeoJSONGeometryReader().ReadFeatureCollection(json); //var geoJsonParser = new GeoJSONGeometryReader(); var balloonPopupStyleBuilder = new BalloonPopupStyleBuilder(); // Create overlay layer for markers var dataSource = new LocalVectorDataSource(proj); var overlayLayer = new ClusteredVectorLayer(dataSource, new MyClusterElementBuilder()); overlayLayer.MinimumClusterDistance = 80; // in pixels mapView.Layers.Add(overlayLayer); for (int i = 0; i < features.FeatureCount; i++) { var geom = features.GetFeature(i).Geometry; var props = features.GetFeature(i).Properties; // Create popup var popup = new BalloonPopup( geom, balloonPopupStyleBuilder.BuildStyle(), props.GetObjectElement("Capital").String, props.GetObjectElement("Country").String); // Copy feature properties to popup metadata for (int j = 0; j < props.ObjectKeys.Count; j++) { var key = props.ObjectKeys[j]; var val = props.GetObjectElement(key); popup.SetMetaDataElement(key, val); } dataSource.Add(popup); } }