Map rotation

View on GitHubSample viewer app

Rotate a map.

Image of map rotation

Use case

A user may wish to view the map in an orientation other than north-facing.

How to use the sample

Press the A and D keys to rotate the map. The text will update to display the map's rotation value. If the map is not pointed north, the compass will display the current heading. Click the compass to set the map's heading to north.

How it works

  1. Create a ArcGISMap and set it to a MapView.
  2. Use mapView.getMapRotation() to get the map's rotation angle.
  3. Create a new Compass(mapView) to show the direction of north.

Relevant API

  • ArcGISMap
  • MapView

Tags

compass, rotate, rotation, toolkit

Sample Code

MapRotationSample.java
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/*
 * Copyright 2018 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.map_rotation;

import javafx.application.Application;
import javafx.beans.binding.Bindings;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Label;
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.Color;
import javafx.scene.paint.Paint;
import javafx.stage.Stage;

import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
import com.esri.arcgisruntime.geometry.Envelope;
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.MapView;
import com.esri.arcgisruntime.toolkit.Compass;

public class MapRotationSample extends Application {

  private MapView mapView;

  @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("Map Rotation 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 streets basemap style
      ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_STREETS);

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

      // create a compass to show the direction of north
      var compass = new Compass(mapView);

      // create labels for instructions and map rotation
      var instructionsLabel = new Label("Press the A and D keys to rotate the map.");
      instructionsLabel.setTextFill(Color.WHITE);
      var rotationLabel = new Label("Current rotation: ");
      rotationLabel.setTextFill(Color.WHITE);

      // update the rotation label when the map rotation property changes
      rotationLabel.textProperty().bind(Bindings.createStringBinding(()->
        "Current map rotation: " + Math.round(mapView.getMapRotation()) + "º", mapView.mapRotationProperty()));

      // create a starting viewpoint for the map view
      SpatialReference spatialReference = SpatialReferences.getWebMercator();
      Point pointBottomLeft = new Point(-13639984.0, 4537387.0, spatialReference);
      Point pointTopRight = new Point(-13606734.0, 4558866, spatialReference);
      Envelope envelope = new Envelope(pointBottomLeft, pointTopRight);
      // set the viewpoint with a rotation of 5 degrees (so that the sample loads with the compass visible)
      Viewpoint viewpoint = new Viewpoint(envelope, 5.0f);

      // set viewpoint to the map view
      mapView.setViewpointAsync(viewpoint);

      // create a vbox to add the labels
      var controlsVBox = new VBox();
      controlsVBox.setBackground(new Background(new BackgroundFill(Paint.valueOf("rgba(0,0,0,0.5)"), CornerRadii.EMPTY,
        Insets.EMPTY)));
      controlsVBox.setPadding(new Insets(10.0));
      controlsVBox.setMaxSize(250, 50);
      controlsVBox.getChildren().addAll(instructionsLabel, rotationLabel);

      // add the map view, slider, and compass to the stack pane
      stackPane.getChildren().addAll(mapView, controlsVBox, compass);
      StackPane.setAlignment(controlsVBox, Pos.TOP_LEFT);
      StackPane.setMargin(controlsVBox, new Insets(10, 0, 0, 10));
      StackPane.setAlignment(compass, Pos.TOP_RIGHT);
      StackPane.setMargin(compass, 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.
   */
  @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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