Java examples for Geographic Information System:Esri
get the view status of a Layer from a Map in esri
/*/* w w w.j a v a 2s . c o m*/ * 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.mapview; import javafx.application.Application; import javafx.application.Platform; import javafx.geometry.Insets; import javafx.geometry.Pos; import javafx.scene.Scene; import javafx.scene.control.Label; import javafx.scene.control.TextArea; import javafx.scene.layout.StackPane; import javafx.scene.layout.VBox; import javafx.stage.Stage; import com.esri.arcgisruntime.datasource.arcgis.ServiceFeatureTable; import com.esri.arcgisruntime.geometry.Point; import com.esri.arcgisruntime.geometry.SpatialReferences; import com.esri.arcgisruntime.layers.ArcGISMapImageLayer; import com.esri.arcgisruntime.layers.ArcGISTiledLayer; import com.esri.arcgisruntime.layers.FeatureLayer; import com.esri.arcgisruntime.layers.Layer; import com.esri.arcgisruntime.mapping.Map; import com.esri.arcgisruntime.mapping.view.LayerViewStatus; import com.esri.arcgisruntime.mapping.view.MapView; import com.esri.arcgisruntime.mapping.view.Viewpoint; /** * This sample demonstrates how to get the view status of a Layer from a Map. * <p> * A {@link LayerViewStatus} can be: * <li>ACTIVE * <li>ERROR * <li>LOADING * <li>NOT_VISIBLE * <li>OUT_OF_SCALE * <li>UNKNOWN</li> * <p> * The LayerViewStatus can be useful in identifying if a user has zoomed to a * certain level of scale that isn't visible in a particular layer. * <h4>How it Works</h4> * * A {@link ArcGISMapImageLayer} is created from a URL and its minimum and * maximum scale is set using the {@link ArcGISMapImageLayer#setMinScale} and * {@link ArcGISMapImageLayer#setMaxScale} methods. This layer is then added to * the map, {@link Map#getOperationalLayers()}, and once the Map is added to * {@link MapView#setMap}, {@link Layer}s of the Map will begin to load and * become ACTIVE. * <p> * The {@link MapView#addLayerViewStateChangedListener} fires an event every * time one of the Layers' view status changes. */ public class DisplayLayerViewStateStatus extends Application { private MapView mapView; private String[] viewStatusList; private static final int MIN_SCALE = 40000000; private static final int TILED_LAYER = 0; private static final int IMAGE_LAYER = 1; private static final int FEATURE_LAYER = 2; private static final String SERVICE_TIME_ZONES = "http://sampleserver6.arcgisonline.com/arcgis/rest/services/WorldTimeZones/MapServer"; private static final String SERVICE_CENSUS = "http://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer"; private static final String SERVICE_RECREATION = "http://sampleserver6.arcgisonline.com/arcgis/rest/services/Recreation/FeatureServer/0"; @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("../resources/SamplesTheme.css").toExternalForm()); // set title, size, and add scene to stage stage.setTitle("Display Layer View State Status Sample"); stage.setWidth(700); stage.setHeight(800); stage.setScene(scene); stage.show(); // create a control panel VBox vBoxControl = new VBox(6); vBoxControl.setMaxSize(250, 270); vBoxControl.getStyleClass().add("panel-region"); // create sample description Label descriptionLabel = new Label("Sample Description:"); descriptionLabel.getStyleClass().add("panel-label"); TextArea description = new TextArea( "This sample shows how to get the view status of a Layer from a Map. " + "Zoom in / out to see the census layer's view status change " + "between ACTIVE and OUT_OF_SCALE."); description.setWrapText(true); description.autosize(); description.setEditable(false); // create labels to display the view status of each layer Label worldTimeZonesLabel = new Label("World Time Zones: "); Label censusLabel = new Label("Census: "); Label facilitiesLabel = new Label("Facilities: "); worldTimeZonesLabel.getStyleClass().add("panel-label"); censusLabel.getStyleClass().add("panel-label"); facilitiesLabel.getStyleClass().add("panel-label"); // add labels and sample description to the control panel vBoxControl.getChildren().addAll(descriptionLabel, description, worldTimeZonesLabel, censusLabel, facilitiesLabel); try { // create three layers to add to the map final ArcGISTiledLayer tiledLayer = new ArcGISTiledLayer(SERVICE_TIME_ZONES); final ArcGISMapImageLayer imageLayer = new ArcGISMapImageLayer(SERVICE_CENSUS); // setting the scales at which this layer can be viewed imageLayer.setMinScale(MIN_SCALE); imageLayer.setMaxScale(MIN_SCALE / 10); // creating a layer from a service feature table final ServiceFeatureTable featureTable = new ServiceFeatureTable(SERVICE_RECREATION); final FeatureLayer featureLayer = new FeatureLayer(featureTable); // adding layers to the maps' layer list final Map map = new Map(); map.getOperationalLayers().add(tiledLayer); map.getOperationalLayers().add(imageLayer); map.getOperationalLayers().add(featureLayer); // create a view and set map to it mapView = new MapView(); mapView.setMap(map); // a point where the map view will zoom to, -11e6 same as -11 x 10^6 mapView.setViewpoint(new Viewpoint( new Point(-11e6, 45e5, SpatialReferences.getWebMercator()), MIN_SCALE)); // create a list to hold the view status of all three layers viewStatusList = new String[3]; // fires every time a layers' view status has changed mapView.addLayerViewStateChangedListener(e -> { // holds the label that needs to be changed Label changedLabel; Layer layer = e.getLayer(); String viewStatus = e.getLayerViewStatus().iterator().next().toString(); final int layerIndex = map.getOperationalLayers().indexOf(layer); // finding and updating label that needs to be changed switch (layerIndex) { case TILED_LAYER: viewStatusList[TILED_LAYER] = "World Time Zones: " + viewStatus; changedLabel = worldTimeZonesLabel; break; case IMAGE_LAYER: viewStatusList[IMAGE_LAYER] = "Census: " + viewStatus; changedLabel = censusLabel; break; case FEATURE_LAYER: viewStatusList[FEATURE_LAYER] = "Facilities: " + viewStatus; changedLabel = facilitiesLabel; break; default: System.out.println("Indexing Error: " + layer.getName() + " not found in map's operational layers list."); changedLabel = new Label(); } // updates view status to corresponding label Platform.runLater(() -> changedLabel.setText(viewStatusList[layerIndex])); }); // add the map view and control panel 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 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 { 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); } }