Java examples for Geographic Information System:Esri
select Features from a FeatureLayer using esri
/*/* w w w . j a v a2 s . c om*/ * Copyright 2015 Esri. * * Licensed under the Apache License, Version 2.0 (the "License"); you may not * use this file except in compliance with the License. You may obtain a copy of * the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations under * the License. */ package com.esri.sampleviewer.samples.featurelayers; import java.util.concurrent.atomic.AtomicInteger; import javafx.application.Application; import javafx.application.Platform; import javafx.geometry.Insets; import javafx.geometry.Point2D; import javafx.geometry.Pos; import javafx.scene.Scene; import javafx.scene.control.Label; import javafx.scene.control.TextArea; import javafx.scene.input.MouseButton; import javafx.scene.input.MouseEvent; import javafx.scene.layout.StackPane; import javafx.scene.layout.VBox; import javafx.stage.Stage; import com.esri.arcgisruntime.concurrent.ListenableFuture; import com.esri.arcgisruntime.datasource.FeatureQueryResult; import com.esri.arcgisruntime.datasource.QueryParameters; import com.esri.arcgisruntime.datasource.QueryParameters.SpatialRelationship; import com.esri.arcgisruntime.datasource.arcgis.ServiceFeatureTable; import com.esri.arcgisruntime.geometry.Envelope; import com.esri.arcgisruntime.geometry.GeometryEngine; import com.esri.arcgisruntime.geometry.Point; import com.esri.arcgisruntime.geometry.Polygon; import com.esri.arcgisruntime.geometry.SpatialReferences; import com.esri.arcgisruntime.layers.FeatureLayer; import com.esri.arcgisruntime.layers.FeatureLayer.SelectionMode; import com.esri.arcgisruntime.mapping.Basemap; import com.esri.arcgisruntime.mapping.Map; import com.esri.arcgisruntime.mapping.view.MapView; import com.esri.arcgisruntime.mapping.view.Viewpoint; import com.esri.arcgisruntime.symbology.RgbColor; /** * This sample demonstrates how to select Features from a FeatureLayer. * <p> * A {@link FeatureLayer} allows us to work with Features from a table, like * displaying Features to Map. * <h4>How it Works</h4> * * A {@link ServiceFeatureTable} is created from a URL and then a FeatureLayer * is created by supplying that table. The {@link FeatureLayer#selectFeatures} * method will select Features filtered by the {@link QueryParameters} that was * passed to it. * * <p> * A ListenableFuture needs to be a class level field because it could get * garbage collected right after being set. */ public class FeatureLayerSelection extends Application { private MapView mapView; private ServiceFeatureTable featureTable; private FeatureLayer featureLayer; private ListenableFuture<FeatureQueryResult> queryResult; private static final String SERVICE_FEATURE_URL = "http://sampleserver6.arcgisonline.com/arcgis/rest/services/DamageAssessment/FeatureServer/0"; private static final String SAMPLES_THEME_PATH = "../resources/SamplesTheme.css"; @Override public void start(Stage stage) throws Exception { // create stack pane and application scene StackPane stackPane = new StackPane(); Scene scene = new Scene(stackPane); scene.getStylesheets().add(getClass().getResource(SAMPLES_THEME_PATH) .toExternalForm()); // set title, size, and add scene to stage stage.setTitle("Feature Layer Selection Sample"); stage.setWidth(800); stage.setHeight(700); stage.setScene(scene); stage.show(); // create a control panel VBox vBoxControl = new VBox(6); vBoxControl.setMaxSize(250, 190); vBoxControl.getStyleClass().add("panel-region"); // create sample label and description Label descriptionLabel = new Label("Sample Description"); descriptionLabel.getStyleClass().add("panel-label"); TextArea description = new TextArea( "This sample demonstrates how to select Features from a Feature Layer. " + "Click a Feature to select it and any Features within a certain " + "distance."); description.setWrapText(true); description.autosize(); description.setEditable(false); // add sample label and description to the control panel vBoxControl.getChildren().addAll(descriptionLabel, description); try { // create a map with the streets basemap final Map map = new Map(Basemap.createStreets()); // set an initial viewpoint Point leftPoint = new Point(-1131596.019761, 3893114.069099, SpatialReferences.getWebMercator()); Point rightPoint = new Point(3926705.982140, 7977912.461790, SpatialReferences.getWebMercator()); map.setInitialViewpoint(new Viewpoint(new Envelope(leftPoint, rightPoint))); // create the service feature table featureTable = new ServiceFeatureTable(SERVICE_FEATURE_URL); // create the feature layer using the service feature table featureLayer = new FeatureLayer(featureTable); featureLayer.setSelectionColor(new RgbColor(0, 255, 255, 255)); // cyan, fully opaque featureLayer.setSelectionWidth(3); // add the layer to the map map.getOperationalLayers().add(featureLayer); // create a view for this map and set map to it mapView = new MapView(); mapView.setMap(map); mapView.addEventHandler(MouseEvent.MOUSE_CLICKED, e -> { if (e.getButton() == MouseButton.PRIMARY) { // create point from where user clicked Point2D point = new Point2D(e.getX(), e.getY()); // create map point from point Point mapPoint = mapView.screenToLocation(point); // select feature that user clicked selectFeatures(mapPoint); } }); // add the map view and control box to stack pane stackPane.getChildren().addAll(mapView, vBoxControl); StackPane.setAlignment(vBoxControl, Pos.TOP_LEFT); StackPane.setMargin(vBoxControl, new Insets(10, 0, 0, 10)); } catch (Exception e) { // on any error, display exception e.printStackTrace(); } } /** * Selects features around map point. * * @param mapPoint x,y coordinate pair */ private void selectFeatures(Point mapPoint) { // create a buffer for the mapPoint double distance = mapView.getUnitsPerPixel() * 10; Polygon pointBuffer = GeometryEngine.buffer(mapPoint, distance); // create a query from pointBuffer QueryParameters queryParams = new QueryParameters(); queryParams.setGeometry(pointBuffer); queryParams.setSpatialRelationship(SpatialRelationship.WITHIN); queryParams.getOutFields().add("*"); // select the features based on the query queryResult = featureLayer.selectFeatures(queryParams, SelectionMode.NEW); try { // get selected features from the result FeatureQueryResult selectedFeatures = queryResult.get(); AtomicInteger numberOfFeatures = new AtomicInteger(0); selectedFeatures.forEach(feature -> numberOfFeatures.incrementAndGet()); } catch (Exception e) { // on any error, display the stack trace e.printStackTrace(); } } /** * Stops and releases all resources used in application. * * @throws Exception if security manager doesn't allow JVM to exit with * current status */ @Override public void stop() throws Exception { // release resources when the application closes if (mapView != null) { mapView.dispose(); } Platform.exit(); System.exit(0); } /** * Opens and runs application. * * @param args arguments passed to this application */ public static void main(String[] args) { Application.launch(args); } }