Feature layer extrusion

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/*
 * Copyright 2017 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.samples.feature_layer_extrusion;

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.ComboBox;
import javafx.scene.control.ListCell;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;
import javafx.util.StringConverter;

import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.data.ServiceFeatureTable;
import com.esri.arcgisruntime.geometry.Point;
import com.esri.arcgisruntime.geometry.SpatialReferences;
import com.esri.arcgisruntime.layers.FeatureLayer;
import com.esri.arcgisruntime.mapping.ArcGISScene;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.view.Camera;
import com.esri.arcgisruntime.mapping.view.SceneView;
import com.esri.arcgisruntime.symbology.Renderer;
import com.esri.arcgisruntime.symbology.SimpleFillSymbol;
import com.esri.arcgisruntime.symbology.SimpleLineSymbol;
import com.esri.arcgisruntime.symbology.SimpleRenderer;

public class FeatureLayerExtrusionSample extends Application {

  private SceneView sceneView;

  @Override
  public void start(Stage stage) {

    StackPane stackPane = new StackPane();
    Scene fxScene = new Scene(stackPane);
    // for adding styling to any controls that are added
    fxScene.getStylesheets().add(getClass().getResource("/feature_layer_extrusion/style.css").toExternalForm());

    // set title, size, and add scene to stage
    stage.setTitle("Feature Layer Extrusion Sample");
    stage.setWidth(800);
    stage.setHeight(700);
    stage.setScene(fxScene);
    stage.show();

    // authentication with an API key or named user is required to access basemaps and other location services
    String yourAPIKey = System.getProperty("apiKey");
    ArcGISRuntimeEnvironment.setApiKey(yourAPIKey);

    // create a scene with a basemap style and set it to the scene view
    ArcGISScene scene = new ArcGISScene(BasemapStyle.ARCGIS_TOPOGRAPHIC);
    sceneView = new SceneView();
    sceneView.setArcGISScene(scene);
    stackPane.getChildren().add(sceneView);

    // get us census data as a service feature table
    ServiceFeatureTable statesServiceFeatureTable = new ServiceFeatureTable("https://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/3");

    // creates feature layer from table and add to scene
    final FeatureLayer statesFeatureLayer = new FeatureLayer(statesServiceFeatureTable);
    // feature layer must be rendered dynamically for extrusion to work
    statesFeatureLayer.setRenderingMode(FeatureLayer.RenderingMode.DYNAMIC);
    scene.getOperationalLayers().add(statesFeatureLayer);

    // symbols are used to display features (US states) from table
    SimpleLineSymbol lineSymbol = new SimpleLineSymbol(SimpleLineSymbol.Style.SOLID, 0xFF000000, 1.0f);
    SimpleFillSymbol fillSymbol = new SimpleFillSymbol(SimpleFillSymbol.Style.SOLID, 0xFF0000FF, lineSymbol);
    final SimpleRenderer renderer = new SimpleRenderer(fillSymbol);
    // set the extrusion mode to absolute height
    renderer.getSceneProperties().setExtrusionMode(Renderer.SceneProperties.ExtrusionMode.ABSOLUTE_HEIGHT);
    statesFeatureLayer.setRenderer(renderer);

    // set camera to focus on state features
    Point lookAtPoint = new Point(-10974490, 4814376, 0, SpatialReferences.getWebMercator());
    sceneView.setViewpointCamera(new Camera(lookAtPoint, 10000000, 0, 20, 0));

    // create a combo box to choose between different expressions/attributes to extrude by
    ComboBox<ExtrusionAttribute> attributeComboBox = new ComboBox<>();
    attributeComboBox.setCellFactory(list -> new ListCell<ExtrusionAttribute> (){
      @Override
      protected void updateItem(ExtrusionAttribute attribute, boolean bln) {

        super.updateItem(attribute, bln);
        if (attribute != null) {
          setText(attribute.getName());
        }
      }
    });
    attributeComboBox.setConverter(new StringConverter<ExtrusionAttribute>() {

      @Override
      public String toString(ExtrusionAttribute travelMode) {
        return travelMode != null ? travelMode.getName() : "";
      }

      @Override
      public ExtrusionAttribute fromString(String fileName) {
        return null;
      }
    });
    // scale down outlier populations
    ExtrusionAttribute populationDensity = new ExtrusionAttribute("Population Density","[POP07_SQMI] * 5000 + 100000");
    // scale up density
    ExtrusionAttribute totalPopulation = new ExtrusionAttribute("Total Population", "[POP2007]/ 10");
    attributeComboBox.setItems(FXCollections.observableArrayList(populationDensity, totalPopulation));
    stackPane.getChildren().add(attributeComboBox);
    StackPane.setAlignment(attributeComboBox, Pos.TOP_LEFT);
    StackPane.setMargin(attributeComboBox, new Insets(10, 0, 0, 10));

    // set the extrusion expression on the renderer when one is chosen in the combo box
    attributeComboBox.getSelectionModel().selectedItemProperty().addListener(e -> {
      ExtrusionAttribute selectedAttribute = attributeComboBox.getSelectionModel().getSelectedItem();
      renderer.getSceneProperties().setExtrusionExpression(selectedAttribute.getExpression());
    });

    // start with total population selected
    attributeComboBox.getSelectionModel().select(totalPopulation);
  }

  /**
   * Create a helper class for showing the extrusion attribute name in a ComboBox.
   */
  private class ExtrusionAttribute {

    private String name;
    private String expression;

    public ExtrusionAttribute(String name, String expression) {
      this.name = name;
      this.expression = expression;
    }

    public String getName() {
      return name;
    }

    public String getExpression() {
      return expression;
    }
  }

  /**
   * Stops and releases all resources used in application.
   */
  @Override
  public void stop() {

    if (sceneView != null) {
      sceneView.dispose();
    }
  }

  /**
   * Opens and runs application.
   *
   * @param args arguments passed to this application
   */
  public static void main(String[] args) {

    Application.launch(args);
  }
}