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 slider to rotate the map. If the map is not pointed north, the slider will show the heading relative to north in degrees. Slide the slider to zero to set the map'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.kt
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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.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
import com.esri.arcgisruntime.sample.maprotation.databinding.ActivityMainBinding

class MainActivity : AppCompatActivity() {

    private val activityMainBinding by lazy {
        ActivityMainBinding.inflate(layoutInflater)
    }

    private val mapView: MapView by lazy {
        activityMainBinding.mapView
    }

    private val rotationSeekBar: SeekBar by lazy {
        activityMainBinding.rotationSeekBar
    }

    private val rotationValueText: TextView by lazy {
        activityMainBinding.rotationValueText
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(activityMainBinding.root)

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

        // create a map with a topographic basemap and initial position
        val map = ArcGISMap(BasemapStyle.ARCGIS_TOPOGRAPHIC)
        // set the map to be displayed in this view
        mapView.map = map
        mapView.setViewpoint(Viewpoint(34.056295, -117.195800, 10000.0))

        rotationSeekBar.setOnSeekBarChangeListener(object : SeekBar.OnSeekBarChangeListener {
            override fun onProgressChanged(seekBar: SeekBar, angle: Int, b: Boolean) {
                // set the text to the value
                rotationValueText.text = angle.toString()
                // rotate map view to the progress angle
                mapView.setViewpointRotationAsync(angle.toDouble())
            }

            override fun onStartTrackingTouch(seekBar: SeekBar?) {}
            override fun onStopTrackingTouch(seekBar: SeekBar?) {}
        })
    }

    override fun onPause() {
        mapView.pause()
        super.onPause()
    }

    override fun onResume() {
        super.onResume()
        mapView.resume()
    }

    override fun onDestroy() {
        mapView.dispose()
        super.onDestroy()
    }
}

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