Explore scenes in flyover AR

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// Copyright 2019 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.

using Android.App;
using Android.OS;
using Android.Widget;
using AndroidX.AppCompat.App;
using Esri.ArcGISRuntime.ARToolkit;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.UI;
using System;

namespace ArcGISRuntimeXamarin.Samples.ExploreScenesInFlyoverAR
{
    [Activity(ConfigurationChanges =
        Android.Content.PM.ConfigChanges.Orientation | Android.Content.PM.ConfigChanges.ScreenSize)]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Explore scenes in flyover AR",
        category: "Augmented reality",
        description: "Use augmented reality (AR) to quickly explore a scene more naturally than you could with a touch or mouse interface.",
        instructions: "When you open the sample, you'll be viewing the scene from above. You can walk around, using your device as a window into the scene. Try moving vertically to get closer to the ground. Touch gestures which ",
        tags: new[] { "augmented reality", "bird's eye", "birds-eye-view", "fly over", "flyover", "mixed reality", "translation factor" })]
    public class ExploreScenesInFlyoverAR : AppCompatActivity
    {
        // Hold references to the UI controls.
        private ARSceneView _arSceneView;

        protected override void OnCreate(Bundle bundle)
        {
            base.OnCreate(bundle);

            Title = "Explore scenes in flyover AR";

            CreateLayout();
        }

        private void CreateLayout()
        {
            // Create the layout.
            LinearLayout layout = new LinearLayout(this) { Orientation = Orientation.Vertical };

            // Add the AR scene view.
            _arSceneView = new ARSceneView(this);
            layout.AddView(_arSceneView);

            SetContentView(layout);

            // Request camera permission. Initialize will be called when permissions are granted.
            Initialize();
        }

        private async void Initialize()
        {
            // Create the scene.
            Scene flyoverScene = new Scene(new Uri("https://www.arcgis.com/home/item.html?id=76ffb1a9e26b4602a04c209146bf2cd3"));

            try
            {
                // Display the scene.
                await flyoverScene.LoadAsync();
                _arSceneView.Scene = flyoverScene;

                // Start with the camera at the scenes initial viewpoint.
                Camera originCamera = new Camera(flyoverScene.InitialViewpoint.Camera.Location.Y, flyoverScene.InitialViewpoint.Camera.Location.X, 200, 0, 90, 0);
                _arSceneView.OriginCamera = originCamera;

                // set the translation factor to enable rapid movement through the scene.
                _arSceneView.TranslationFactor = 1000;

                // Enable atmosphere and space effects for a more immersive experience.
                _arSceneView.SpaceEffect = SpaceEffect.Stars;
                _arSceneView.AtmosphereEffect = AtmosphereEffect.Realistic;
            }
            catch (Exception ex)
            {
                new Android.App.AlertDialog.Builder(this).SetMessage(ex.Message).SetTitle("Error").Show();
                System.Diagnostics.Debug.WriteLine(ex);
            }
        }

        protected override async void OnPause()
        {
            base.OnPause();
            await _arSceneView.StopTrackingAsync();
        }

        protected override async void OnResume()
        {
            base.OnResume();

            // Start AR tracking without location updates.
            await _arSceneView.StartTrackingAsync();
        }
    }
}