Update graphics

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Change a graphic's symbol, attributes, and geometry.

Image of Update Graphics

Use case

A field worker may want to update a graphic's properties to adjust which real-world elements it represents in their map.

How to use the sample

To update the graphic's location, click on a graphic and then drag it to a new location. Use the "Update Description" button to provide a new description for the graphic, and use the "Update Symbol" drop down menu to choose a new symbol. Click away from the graphic to de-select it.

How it works

  1. Capture clicks on the MapView by using .setOnMouseClicked(). Then use the event to create a Point from the clicked location.
  2. Identify the clicked graphics using MapView.identifyGraphicsOverlayAsync(graphicsOverlay, pointClicked, tolerance, max results).
  3. To select a clicked graphics, iterate through the list of graphics returned by the identification method, and set each graphic's selection property to true.
  4. To update a graphic's location, capture drags on the map view using .setOnMouseDragged(), and use Graphic.setGeometry(point) to modify the graphic's geometry from the dragged location.
  5. To update a graphic's attribute, get the attributes of the selected graphic and set the DESCRIPTION key with the desired string value using Graphic.getAttributes().put("DESCRIPTION",).
  6. To update graphic's symbol simply assign that symbol to the selected graphic using Graphic.setSymbol(SimpleMarkerSymbol).

Additional information

A graphic's geometry is its location on a map. The symbol controls how a graphic will be displayed to a map. The attributes store information about the graphic in key value pairs.

Relevant API

  • ArcGISMap
  • Graphic
  • GraphicsOverlay
  • MapView
  • SimpleMarkerSymbol

Tags

location, description, symbol, adjust, modify, attributes, geometry, marker

Sample Code

UpdateGraphicsSample.java
                                                                                                                                                                                                                                                                                                                
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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.update_graphics;

import java.util.ArrayList;
import java.util.List;
import java.util.Optional;

import javafx.application.Application;
import javafx.geometry.Insets;
import javafx.geometry.Point2D;
import javafx.geometry.Pos;
import javafx.scene.Cursor;
import javafx.scene.Scene;
import javafx.scene.control.Alert;
import javafx.scene.control.Button;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;
import javafx.scene.control.TextInputDialog;
import javafx.scene.input.MouseButton;
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.scene.paint.Paint;
import javafx.stage.Stage;

import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.concurrent.ListenableFuture;
import com.esri.arcgisruntime.geometry.Point;
import com.esri.arcgisruntime.geometry.SpatialReference;
import com.esri.arcgisruntime.geometry.SpatialReferences;
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.IdentifyGraphicsOverlayResult;
import com.esri.arcgisruntime.mapping.view.MapView;
import com.esri.arcgisruntime.symbology.SimpleMarkerSymbol;

public class UpdateGraphicsSample extends Application {

  private List<SimpleMarkerSymbol> markers;
  private Button updateDescriptionButton;
  private ComboBox<String> symbolBox;

  private MapView mapView;
  private Graphic identifiedGraphic;
  private GraphicsOverlay graphicsOverlay;
  private Point2D mapViewPoint;

  // colors for symbols
  private static final int PURPLE = 0xFF800080;
  private static final int BLUE = 0xFF0000FF;
  private static final int RED = 0xFFFF0000;
  private static final int GREEN = 0xFF00FF00;

  @Override
  public void start(Stage stage) {

    try {
      // create stack pane and application scene
      StackPane stackPane = new StackPane();
      Scene scene = new Scene(stackPane);
      scene.getStylesheets().add(getClass().getResource("/update_graphics/style.css").toExternalForm());

      // set title, size, and add scene to stage
      stage.setTitle("Update Graphics 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 control panel
      VBox 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(180, 100);
      controlsVBox.getStyleClass().add("panel-region");

      // create buttons for user interaction
      updateDescriptionButton = new Button("Update Description");
      updateDescriptionButton.setMaxWidth(Double.MAX_VALUE);
      updateDescriptionButton.setDisable(true);

      // create combo box for the UI
      Label symbolLabel = new Label("Update Symbol:");
      symbolLabel.getStyleClass().add("panel-label");
      symbolBox = new ComboBox<>();
      symbolBox.getItems().addAll("CIRCLE", "TRIANGLE", "CROSS", "DIAMOND");
      symbolBox.getSelectionModel().selectFirst();
      symbolBox.setMaxWidth(Double.MAX_VALUE);
      symbolBox.setDisable(true);

      // set the symbol of the graphic
      symbolBox.showingProperty().addListener((obs, wasShowing, isShowing) -> {
        if (identifiedGraphic.isSelected() && !isShowing) {
          identifiedGraphic.setSymbol(markers.get(symbolBox.getSelectionModel().getSelectedIndex()));
        }
      });

      // add the button, label, and combo box to the control panel
      controlsVBox.getChildren().addAll(updateDescriptionButton, symbolLabel, symbolBox);

      // create a map with the light gray basemap style
      ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_LIGHT_GRAY);

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

      // set a viewpoint on the map view
      mapView.setViewpoint(new Viewpoint(56.075844, -2.681572, 70000));

      // create a graphics overlay
      graphicsOverlay = new GraphicsOverlay();

      // add graphics overlay to the map view
      mapView.getGraphicsOverlays().add(graphicsOverlay);

      // create default graphics for graphics overlay
      createGraphics();

      updateDescriptionButton.setOnAction(e -> {
        if (identifiedGraphic.isSelected()) {
          // get attributes from selected graphic
          java.util.Map<String, Object> attributes = identifiedGraphic.getAttributes();

          // create input dialog
          TextInputDialog dialog = new TextInputDialog();
          dialog.setTitle(attributes.get("NAME").toString());
          dialog.setGraphic(null);
          dialog.setHeaderText(attributes.get("DESCRIPTION").toString());
          dialog.setContentText("New Description");

          // set the graphic's description is text entered
          Optional<String> result = dialog.showAndWait();
          result.ifPresent(text -> {
            if (!text.isEmpty()) {
              attributes.put("DESCRIPTION", text);
            }
          });
        }
      });

      mapView.setOnMouseClicked(e -> {
        if (e.getButton() == MouseButton.PRIMARY && e.isStillSincePress()) {
          // set the cursor to default
          mapView.setCursor(Cursor.DEFAULT);

          // clear any selected graphic
          graphicsOverlay.clearSelection();

          // create a point where the user clicked
          mapViewPoint = new Point2D(e.getX(), e.getY());

          // identify graphics on the graphics overlay
          ListenableFuture<IdentifyGraphicsOverlayResult> identifyGraphics =
            mapView.identifyGraphicsOverlayAsync(graphicsOverlay, mapViewPoint, 10, false);

          identifyGraphics.addDoneListener(() -> {
            try {
              if (!identifyGraphics.get().getGraphics().isEmpty()) {
                // get the first identified graphic
                identifiedGraphic = identifyGraphics.get().getGraphics().get(0);
                // select the identified graphic
                identifiedGraphic.setSelected(true);
                // update the drop down box with the identified graphic's current symbol
                String style = ((SimpleMarkerSymbol) identifiedGraphic.getSymbol()).getStyle().toString();
                symbolBox.getSelectionModel().select(style);
                // show the UI
                disableUI(false);

                // enable dragging of the identified graphic to move its location
                mapView.setOnMouseDragged(event -> {
                  if (identifiedGraphic.isSelected() && identifiedGraphic != null) {
                    // set the cursor to closed hand to indicate graphic dragging is active
                    mapView.setCursor(Cursor.CLOSED_HAND);
                    // create a point from the dragged location
                    mapViewPoint = new Point2D(event.getX(), event.getY());
                    Point mapPoint = mapView.screenToLocation(mapViewPoint);
                    // update the location of the graphic to the dragged location
                    identifiedGraphic.setGeometry(mapPoint);
                  }
                });
              } else {
                disableUI(true);
              }
            } catch (Exception x) {
              new Alert(Alert.AlertType.ERROR, "Error identifying clicked graphic").show();
            }
          });
        }
      });

      // add the map view and control panel to stack pane
      stackPane.getChildren().addAll(mapView, controlsVBox);
      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 four Graphics with a location, a symbol, and two attributes. Then
   * adds those Graphics to the GraphicsOverlay.
   */
  private void createGraphics() {

    Graphic graphic;
    // create spatial reference for the points
    SpatialReference spatialReference = SpatialReferences.getWgs84();

    // create points to place markers
    List<Point> points = new ArrayList<>();
    points.add(new Point(-2.641, 56.077, spatialReference));
    points.add(new Point(-2.669, 56.058, spatialReference));
    points.add(new Point(-2.718, 56.060, spatialReference));
    points.add(new Point(-2.720, 56.073, spatialReference));

    // create simple marker symbols for the points
    markers = new ArrayList<>();
    markers.add(new SimpleMarkerSymbol(SimpleMarkerSymbol.Style.CIRCLE, RED, 10));
    markers.add(new SimpleMarkerSymbol(SimpleMarkerSymbol.Style.TRIANGLE, PURPLE, 10));
    markers.add(new SimpleMarkerSymbol(SimpleMarkerSymbol.Style.CROSS, GREEN, 10));
    markers.add(new SimpleMarkerSymbol(SimpleMarkerSymbol.Style.DIAMOND, BLUE, 10));

    // create a list of names for graphics
    List<String> names = new ArrayList<>();
    names.add("LAMB");
    names.add("CANTY BAY");
    names.add("NORTH BERWICK");
    names.add("FIDRA");

    // create a list of descriptions for graphics
    List<String> descriptions = new ArrayList<>();
    descriptions.add("Just opposite of Bass Rock.");
    descriptions.add("100m long and 50m wide.");
    descriptions.add("Lighthouse in northern section.");
    descriptions.add("Also known as Barley Farmstead.");

    // create four graphics with attributes and add to graphics overlay
    for (int i = 0; i < 4; i++) {
      graphic = new Graphic(points.get(i), markers.get(i));
      graphic.getAttributes().put("NAME", names.get(i));
      graphic.getAttributes().put("DESCRIPTION", descriptions.get(i));
      graphicsOverlay.getGraphics().add(graphic);
    }
  }

  /**
   * Disables the visibility of the UI controls.
   *
   * @param isDisabled visibility of the UI
   */
  private void disableUI(boolean isDisabled) {
    updateDescriptionButton.setDisable(isDisabled);
    symbolBox.setDisable(isDisabled);
  }

  /**
   * 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);
  }
}

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