Apply mosaic rule to rasters

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/*
 * Copyright 2021 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.apply_mosaic_rule_to_rasters;

import java.util.Arrays;

import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.ComboBox;
import javafx.scene.control.ProgressIndicator;
import javafx.scene.layout.Background;
import javafx.scene.layout.BackgroundFill;
import javafx.scene.layout.CornerRadii;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javafx.scene.paint.Paint;
import javafx.scene.paint.Color;
import javafx.scene.control.Label;

import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.layers.RasterLayer;
import com.esri.arcgisruntime.loadable.LoadStatus;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.view.DrawStatus;
import com.esri.arcgisruntime.mapping.Viewpoint;
import com.esri.arcgisruntime.mapping.view.MapView;
import com.esri.arcgisruntime.raster.ImageServiceRaster;
import com.esri.arcgisruntime.raster.MosaicRule;
import com.esri.arcgisruntime.raster.MosaicMethod;
import com.esri.arcgisruntime.raster.MosaicOperation;

public class ApplyMosaicRuleToRastersSample extends Application {

  private ComboBox<String> mosaicRuleComboBox;
  private MapView mapView;
  private MosaicRule mosaicRule;
  private VBox controlsVBox;

  @Override
  public void start(Stage stage) {

    try {
      // create stack pane and application scene
      StackPane stackPane = new StackPane();
      Scene scene = new Scene(stackPane);

      // set title, size, and add scene to stage
      stage.setTitle("Apply Mosaic Rule To Rasters Sample");
      stage.setWidth(800);
      stage.setHeight(700);
      stage.setScene(scene);
      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 map with the light gray basemap style
      ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_LIGHT_GRAY);

      // create a map view
      mapView = new MapView();

      // show progress indicator while map view is drawing
      var progressIndicator = new ProgressIndicator();
      mapView.addDrawStatusChangedListener(drawStatusChangedEvent ->
        progressIndicator.setVisible(drawStatusChangedEvent.getDrawStatus() == DrawStatus.IN_PROGRESS));

      // set the map to the map view
      mapView.setMap(map);

      // setup the UI
      setupUI();

      // create a raster layer from the image service raster
      ImageServiceRaster imageServiceRaster = new ImageServiceRaster(
        "https://sampleserver7.arcgisonline.com/server/rest/services/amberg_germany/ImageServer");
      RasterLayer rasterLayer = new RasterLayer(imageServiceRaster);

      // add a raster layer as an operational layer to the map
      map.getOperationalLayers().add(rasterLayer);

      // wait for the raster layer to finish loading
      rasterLayer.addDoneLoadingListener(() -> {
        if (rasterLayer.getLoadStatus() == LoadStatus.LOADED) {
          // when loaded, set the map view's viewpoint to the image service raster's center
          mapView.setViewpoint(new Viewpoint(imageServiceRaster.getServiceInfo().getFullExtent().getCenter(), 25000.0));

          // enable UI interaction once the raster layer has loaded
          controlsVBox.setVisible(true);

          // create a mosaic rule for the image service raster if one does not already exist
          if (imageServiceRaster.getMosaicRule() == null) {
            mosaicRule = new MosaicRule();
            imageServiceRaster.setMosaicRule(mosaicRule);
          }
        } else {
          // show alert if raster layer fails to load.
          new Alert(Alert.AlertType.ERROR, "Error loading raster layer.").show();
        }
      });

      // set the mosaic rule of the image service raster based on rule chosen from the combo box
      mosaicRuleComboBox.getSelectionModel().selectedItemProperty().addListener(e -> {
        // create a new mosaic rule
        mosaicRule = new MosaicRule();

        switch (mosaicRuleComboBox.getSelectionModel().getSelectedItem()) {
          case "Default":
            mosaicRule.setMosaicMethod(MosaicMethod.NONE);
            break;
          case "Northwest":
            mosaicRule.setMosaicMethod(MosaicMethod.NORTHWEST);
            mosaicRule.setMosaicOperation(MosaicOperation.FIRST);
            break;
          case "Center":
            mosaicRule.setMosaicMethod(MosaicMethod.CENTER);
            mosaicRule.setMosaicOperation(MosaicOperation.BLEND);
            break;
          case "By attribute":
            mosaicRule.setMosaicMethod(MosaicMethod.ATTRIBUTE);
            mosaicRule.setSortField("OBJECTID");
            break;
          case "Lock raster":
            mosaicRule.setMosaicMethod(MosaicMethod.LOCK_RASTER);
            mosaicRule.getLockRasterIds().clear();
            // lock the display of multiple rasters based on the ObjectID
            mosaicRule.getLockRasterIds().addAll(Arrays.asList(1L, 7L, 12L));
            break;
        }
        // set the mosaic rule of the image service raster
        imageServiceRaster.setMosaicRule(mosaicRule);
      });

      // add the map view, control panel and progress indicator to the stack pane
      stackPane.getChildren().addAll(mapView, controlsVBox, progressIndicator);
      StackPane.setAlignment(controlsVBox, Pos.TOP_LEFT);
      StackPane.setMargin(controlsVBox, new Insets(10, 0, 0, 10));
    } catch (Exception e) {
      // on any error, display the stack trace
      e.printStackTrace();
    }
  }

  /**
   * Creates a UI with a drop down box.
   */
  private void setupUI() {
    // create a label
    Label mosaicRuleLabel = new Label("Choose a mosaic rule: ");
    mosaicRuleLabel.setStyle("-fx-text-fill: white");

    // create a combo box
    mosaicRuleComboBox = new ComboBox<>(
      FXCollections.observableArrayList("Default", "Northwest", "Center", "By attribute", "Lock raster"));
    mosaicRuleComboBox.setMaxWidth(Double.MAX_VALUE);

    // set the default combo box value
    mosaicRuleComboBox.getSelectionModel().select(0);

    // set up the control panel UI
    controlsVBox = new VBox(6);
    controlsVBox.setBackground(new Background(new BackgroundFill(Paint.valueOf("rgba(0, 0, 0, 0.3)"),
      CornerRadii.EMPTY, Insets.EMPTY)));
    controlsVBox.setPadding(new Insets(10.0));
    controlsVBox.setMaxSize(210, 50);
    controlsVBox.setVisible(false);
    // add the label and combo box to the control panel
    controlsVBox.getChildren().addAll(mosaicRuleLabel, mosaicRuleComboBox);
  }

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

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

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

    Application.launch(args);
  }
}