Show location history

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/*
 * Copyright 2020 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.show_location_history;

import java.nio.charset.StandardCharsets;
import java.util.Arrays;
import java.util.Calendar;

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Label;
import javafx.scene.control.ToggleButton;
import javafx.scene.layout.Background;
import javafx.scene.layout.BackgroundFill;
import javafx.scene.layout.CornerRadii;
import javafx.scene.layout.HBox;
import javafx.scene.layout.StackPane;
import javafx.scene.paint.Paint;
import javafx.stage.Stage;

import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.geometry.Geometry;
import com.esri.arcgisruntime.geometry.Point;
import com.esri.arcgisruntime.geometry.Polyline;
import com.esri.arcgisruntime.geometry.PolylineBuilder;
import com.esri.arcgisruntime.geometry.SpatialReferences;
import com.esri.arcgisruntime.loadable.LoadStatus;
import com.esri.arcgisruntime.location.LocationDataSource;
import com.esri.arcgisruntime.location.LocationDataSource.LocationChangedListener;
import com.esri.arcgisruntime.location.SimulatedLocationDataSource;
import com.esri.arcgisruntime.location.SimulationParameters;
import com.esri.arcgisruntime.mapping.ArcGISMap;
import com.esri.arcgisruntime.mapping.BasemapStyle;
import com.esri.arcgisruntime.mapping.Viewpoint;
import com.esri.arcgisruntime.mapping.view.Graphic;
import com.esri.arcgisruntime.mapping.view.GraphicsOverlay;
import com.esri.arcgisruntime.mapping.view.LocationDisplay;
import com.esri.arcgisruntime.mapping.view.MapView;
import com.esri.arcgisruntime.symbology.SimpleLineSymbol;
import com.esri.arcgisruntime.symbology.SimpleMarkerSymbol;
import com.esri.arcgisruntime.symbology.SimpleRenderer;

import org.apache.commons.io.IOUtils;

public class ShowLocationHistorySample extends Application {

  private MapView mapView;
  private Point position;

  @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("Show Location History Sample");
      stage.setWidth(800);
      stage.setHeight(700);
      stage.setScene(scene);
      stage.show();
      scene.getStylesheets().add(getClass().getResource("/show_location_history/style.css").toExternalForm());

      // 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 dark gray basemap style
      ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_DARK_GRAY);

      // create a map view and set the map to it
      mapView = new MapView();
      mapView.setMap(map);

      // set a viewpoint on the map view centered on Los Angeles, California
      mapView.setViewpoint(new Viewpoint(new Point(-13185535.98, 4037766.28, SpatialReferences.getWebMercator()), 7000));

      // create a label
      Label trackingLabel = new Label("Tracking Status: ");

      // create a button that toggles the location tracking
      ToggleButton trackingButton = new ToggleButton("Start");
      trackingButton.maxWidth(Double.MAX_VALUE);
      trackingButton.setDisable(true);

      // create a graphics overlay for the points and use a red circle for the symbols
      GraphicsOverlay locationHistoryOverlay = new GraphicsOverlay();
      SimpleMarkerSymbol locationSymbol = new SimpleMarkerSymbol(
        SimpleMarkerSymbol.Style.CIRCLE, 0xFFFF0000, 10f);
      SimpleRenderer locationHistoryRenderer = new SimpleRenderer(locationSymbol);
      locationHistoryOverlay.setRenderer(locationHistoryRenderer);

      // create a graphics overlay for the lines connecting the points and use a green line for the symbol
      GraphicsOverlay locationHistoryLineOverlay = new GraphicsOverlay();
      SimpleLineSymbol locationLineSymbol = new SimpleLineSymbol(
        SimpleLineSymbol.Style.SOLID, 0xFF00FF00, 2.0f);
      SimpleRenderer locationHistoryLineRenderer = new SimpleRenderer(locationLineSymbol);
      locationHistoryLineOverlay.setRenderer(locationHistoryLineRenderer);

      // add the graphics overlays to the map view
      mapView.getGraphicsOverlays().addAll(Arrays.asList(locationHistoryOverlay, locationHistoryLineOverlay));

      // create a polyline builder to connect the location points
      PolylineBuilder polylineBuilder = new PolylineBuilder(SpatialReferences.getWebMercator());

      // access the json of the location points
      String polylineData = IOUtils.toString(getClass().getResourceAsStream("/show_location_history/polyline_data.json"), StandardCharsets.UTF_8);
      // create a polyline from the location points
      Polyline routePolyline = (Polyline) Geometry.fromJson(polylineData, SpatialReferences.getWebMercator());

      // create a simulated location data source
      SimulatedLocationDataSource simulatedLocationDataSource = new SimulatedLocationDataSource();
      // set the location of the simulated location data source with simulation parameters to set a consistent velocity
      simulatedLocationDataSource.setLocations(
        routePolyline, new SimulationParameters(Calendar.getInstance(), 30.0, 0.0, 0.0));

      // configure the map view's location display to follow the simulated location data source
      LocationDisplay locationDisplay = mapView.getLocationDisplay();
      locationDisplay.setLocationDataSource(simulatedLocationDataSource);
      locationDisplay.setAutoPanMode(LocationDisplay.AutoPanMode.RECENTER);
      locationDisplay.setInitialZoomScale(7000);

      // create a listener to track the previous location, to draw a route line behind the location display symbol
      LocationChangedListener locationChangedListener =
        (LocationDataSource.LocationChangedEvent locationChangedEvent) -> {

        // reset the old polyline connecting the points
        locationHistoryLineOverlay.getGraphics().clear();

        // add any previous position to the history
        if (position != null) {
          // add the new point to the polyline
          polylineBuilder.addPoint(position);
          // add the new point to the graphics overlay
          locationHistoryOverlay.getGraphics().add(new Graphic(position));
        }
        // store the current position
        position = locationChangedEvent.getLocation().getPosition();

        // add the updated polyline to the graphics overlay
        locationHistoryLineOverlay.getGraphics().add(new Graphic(polylineBuilder.toGeometry()));
      };

      trackingButton.setOnAction(event -> {
        // if the user has panned away from the location display, turn it on again
        if (locationDisplay.getAutoPanMode() == LocationDisplay.AutoPanMode.OFF) {
          locationDisplay.setAutoPanMode(LocationDisplay.AutoPanMode.RECENTER);
        }
        // toggle the location tracking when the button is clicked
        if (trackingButton.isSelected()) {
          simulatedLocationDataSource.addLocationChangedListener(locationChangedListener);
          trackingButton.setText("Active");
          trackingButton.setStyle("-fx-focus-color: #00ff00;");
        } else {
          simulatedLocationDataSource.removeLocationChangedListener(locationChangedListener);
          trackingButton.setText("Stopped");
          trackingButton.setStyle("-fx-focus-color: #f16345;");
        }
      });

      // enable the button interactions when the map is loaded
      map.addDoneLoadingListener(() -> {

        if (map.getLoadStatus() == LoadStatus.LOADED) {
          trackingButton.setDisable(false);

          // start the simulated location data source
          simulatedLocationDataSource.startAsync();

        } else {
          new Alert(Alert.AlertType.ERROR, "Map failed to load: " + map.getLoadError().getCause().getMessage()).show();
        }
      });

      // create a control panel and add the label and button UI components
      HBox controlsHBox = new HBox();
      controlsHBox.setBackground(new Background(new BackgroundFill(Paint.valueOf("rgba(0,0,0,0.3)"), CornerRadii.EMPTY, Insets.EMPTY)));
      controlsHBox.setPadding(new Insets(10.0));
      controlsHBox.setAlignment(Pos.CENTER);
      controlsHBox.setMaxSize(210, 50);
      controlsHBox.getStyleClass().add("panel-region");
      controlsHBox.getChildren().addAll(trackingLabel, trackingButton);

      // add the map view and control panel to the stack pane
      stackPane.getChildren().addAll(mapView, controlsHBox);
      StackPane.setAlignment(controlsHBox, Pos.TOP_LEFT);
      StackPane.setMargin(controlsHBox, 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.
   */
  @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);
  }
}