Map rotation

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Sample 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

Use the progress bar to rotate the map. If the map is not pointed north, the progress bar will show the heading relative to north in degrees. Slide the progress bar to zero to set the maps's heading back to north.

How it works

  1. Instantiate an ArcGISMap object.
  2. Set the map to a MapView object.
  3. Use setViewpointRotationAsync(...) to set the rotation angle.

Relevant API

  • ArcGISMap
  • MapView

Tags

rotate, rotation, viewpoint

Sample Code

MainActivity.java
                                                                                                
/*
 * Copyright 2015 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.arcgisruntime.sample.maprotation;

import android.os.Bundle;
import android.widget.SeekBar;
import android.widget.TextView;

import androidx.appcompat.app.AppCompatActivity;
import com.esri.arcgisruntime.ArcGISRuntimeEnvironment;
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;

public class MainActivity extends AppCompatActivity {

  private MapView mMapView;
  private TextView mRotationValueText;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // authentication with an API key or named user is required to access basemaps and other
    // location services
    ArcGISRuntimeEnvironment.setApiKey(BuildConfig.API_KEY);

    // create MapView from layout
    mMapView = findViewById(R.id.mapView);
    // create a map with the Basemap.Type topographic
    ArcGISMap map = new ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC);
    // set the map to be displayed in this view
    mMapView.setMap(map);
    mMapView.setViewpoint(new Viewpoint( 34.056295, -117.195800, 100000));
    // create TextView to show angle of rotation
    mRotationValueText = findViewById(R.id.rotationValueText);
    // create SeekBar
    SeekBar mRotationSeekBar = findViewById(R.id.rotationSeekBar);
    mRotationSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
      @Override
      public void onProgressChanged(SeekBar seekBar, int angle, boolean b) {
        // convert progress to double
        double dAngle = angle;
        // set the text to SeekBar value
        mRotationValueText.setText(String.valueOf(angle));
        // rotate MapView to double angle value
        mMapView.setViewpointRotationAsync(dAngle);
      }

      @Override
      public void onStartTrackingTouch(SeekBar seekBar) {

      }

      @Override
      public void onStopTrackingTouch(SeekBar seekBar) {

      }
    });
  }

  @Override
  protected void onPause() {
    super.onPause();
    mMapView.pause();
  }

  @Override
  protected void onResume() {
    super.onResume();
    mMapView.resume();
  }

  @Override
  protected void onDestroy() {
    super.onDestroy();
    mMapView.dispose();
  }
}