Display your position on the map and switch between different types of autopan modes.
Use case
When using a map within a GIS, it may be helpful for a user to know their own location within a map, whether that's to aid the user's navigation or to provide an easy means of identifying/collecting geospatial information at their location.
How to use the sample
The sample loads with a symbol marking a simulated location on the map. Explore the available autopan modes by selecting an option from the drop down box:
Off - Shows the location with no autopan mode set.
Re-Center - In this mode, the map re-centers on the location symbol when the symbol moves outside a "wander extent".
Navigation - This mode is best suited for in-vehicle navigation.
Compass - This mode is better suited for waypoint navigation when the user is walking.
Uncheck the box to stop the location display.
How it works
Create a MapView.
Get the LocationDisplay object by calling getLocationDisplay() on the map view.
Create a SimulatedLocationDataSource and call its setLocations() method, passing the route Polyline and new SimulationParameters as parameters.
Start the location display with startAsync() to begin receiving location updates.
Use locationDisplay.setAutoPanMode() to change how the map view behaves when location updates are received.
Relevant API
LocationDisplay
LocationDisplay.AutoPanMode
MapView
SimulatedLocationDataSource
SimulationParameters
Additional information
A custom set of points (provided in JSON format) is used to create a Polyline and configure a SimulatedLocationDataSource. The simulated location data source enables easier testing and allows the sample to be used on devices without an actively updating GPS signal. To display a user's real position, use NMEALocationDataSource instead.
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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.display_device_location_with_autopan_modes;
import java.nio.charset.StandardCharsets;
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.CheckBox;
import javafx.scene.control.ComboBox;
import javafx.scene.control.Label;
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.geometry.Geometry;
import com.esri.arcgisruntime.geometry.Polyline;
import com.esri.arcgisruntime.geometry.SpatialReferences;
import com.esri.arcgisruntime.loadable.LoadStatus;
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.view.LocationDisplay;
import com.esri.arcgisruntime.mapping.view.MapView;
import org.apache.commons.io.IOUtils;
publicclassDisplayDeviceLocationWithAutopanModesSampleextendsApplication{
private MapView mapView;
@Overridepublicvoidstart(Stage stage){
try {
// create the stack pane and the application scene StackPane stackPane = new StackPane();
Scene scene = new Scene(stackPane);
// set a title, size, and add the scene to stage stage.setTitle("Display Device Location With Autopan Modes Sample");
stage.setWidth(800);
stage.setHeight(700);
stage.setScene(scene);
stage.show();
scene.getStylesheets().add(getClass().getResource("/display_device_location_with_autopan_modes/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 standard imagery basemap style ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_IMAGERY_STANDARD);
// create a map view and set the map to it mapView = new MapView();
mapView.setMap(map);
// create a combo box ComboBox<String> comboBox = new ComboBox<>();
comboBox.setMaxWidth(Double.MAX_VALUE);
comboBox.setDisable(true);
// add the autopan modes to the combo box comboBox.getItems().addAll("Re-Center", "Navigation", "Compass", "Off");
comboBox.setValue("Re-Center");
// add a label Label autopanModeLabel = new Label("Choose an autopan mode:");
// add a checkbox that toggles the visibility of the location display CheckBox checkBox = new CheckBox("Show device location");
checkBox.setDisable(true);
// access the json of the location points String polylineData = IOUtils.toString(getClass().getResourceAsStream(
"/display_device_location_with_autopan_modes/polyline_data.json"), StandardCharsets.UTF_8);
// create a polyline from the location points Polyline locations = (Polyline) Geometry.fromJson(polylineData, SpatialReferences.getWgs84());
// 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(
locations, new SimulationParameters(Calendar.getInstance(), 5.0, 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(1000);
// enable the checkbox and combo box interactions when the map is loaded map.addDoneLoadingListener(() -> {
if (map.getLoadStatus() == LoadStatus.LOADED) {
checkBox.setDisable(false);
checkBox.setSelected(true);
comboBox.setDisable(false);
// start the location display locationDisplay.startAsync();
} else {
new Alert(Alert.AlertType.ERROR, "Map failed to load: " + map.getLoadError().getCause().getMessage()).show();
}
});
// control location display updates and visibility checkBox.setOnAction(event -> {
if (checkBox.isSelected()) {
// start receiving location updates and display the current location with a default round blue symbol locationDisplay.startAsync();
} else {
// stop receiving location updates and displaying location symbol locationDisplay.stop();
}
// toggle the combo box interactions comboBox.setDisable(!checkBox.isSelected());
});
// set the autopan mode of the location display based on the mode chosen from the combo box comboBox.getSelectionModel().selectedItemProperty().addListener(e -> {
// set the scale that the map view will zoom to when the autopan mode is changed locationDisplay.setInitialZoomScale(1000);
switch (comboBox.getSelectionModel().getSelectedItem()) {
case"Off":
locationDisplay.setAutoPanMode(LocationDisplay.AutoPanMode.OFF);
break;
case"Re-Center":
locationDisplay.setAutoPanMode(LocationDisplay.AutoPanMode.RECENTER);
break;
case"Navigation":
locationDisplay.setAutoPanMode(LocationDisplay.AutoPanMode.NAVIGATION);
break;
case"Compass":
locationDisplay.setAutoPanMode(LocationDisplay.AutoPanMode.COMPASS_NAVIGATION);
break;
}
});
mapView.setOnMouseClicked(event -> {
if (event.getButton() == MouseButton.PRIMARY) {
// if the user has panned away from the location displayif (locationDisplay.getAutoPanMode() == LocationDisplay.AutoPanMode.OFF) {
// set the combo box comboBox.setValue("Off");
}
}
});
// 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(230, 50);
controlsVBox.getStyleClass().add("panel-region");
// add the checkbox, label and combo box to the control panel controlsVBox.getChildren().addAll(checkBox, autopanModeLabel, comboBox);
// add the map view and control panel to the stack pane stackPane.getChildren().addAll(mapView, controlsVBox);
StackPane.setAlignment(controlsVBox, Pos.TOP_RIGHT);
StackPane.setMargin(controlsVBox, new Insets(10, 10, 0, 0));
} catch (Exception e) {
// on any error, display the stack trace. e.printStackTrace();
}
}
/**
* Stops and releases all resources used in application.
*/@Overridepublicvoidstop(){
if (mapView != null) {
mapView.dispose();
}
}
/**
* Opens and runs application.
*
* @param args arguments passed to this application
*/publicstaticvoidmain(String[] args){
Application.launch(args);
}
}