Camera Class

public class Camera

// 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.

using Android.App;
using Android.OS;
using Android.Widget;
using Esri.ArcGISRuntime.Data;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.UI.Controls;
using System;

namespace ArcGISRuntime.Samples.FeatureLayerRenderingModeScene
{
    [Activity]
    [ArcGISRuntime.Samples.Shared.Attributes.AndroidLayout("FeatureLayerRenderingModeScene.axml")]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        "Feature layer rendering mode (Scene)",
        "Layers",
        "This sample demonstrates how to use load settings to change the preferred rendering mode for a scene. Static rendering mode only redraws features periodically when a sceneview is navigating, while dynamic mode dynamically re-renders as the scene moves.",
        "Press the 'Animated Zoom' button to trigger a zoom. Observe the differences between the two scenes. Static is on top, dynamic on bottom.")]
    public class FeatureLayerRenderingModeScene : Activity
    {
        // Create the scene views
        private SceneView _myStaticSceneView = new SceneView();
        private SceneView _myDynamicSceneView = new SceneView();

        // Points for demonstrating zoom
        private readonly MapPoint _zoomedOutPoint = new MapPoint(-118.37, 34.46, SpatialReferences.Wgs84);
        private readonly MapPoint _zoomedInPoint = new MapPoint(-118.45, 34.395, SpatialReferences.Wgs84);

        // Viewpoints for each zoom level
        private Camera _zoomedOutCamera;
        private Camera _zoomedInCamera;

        // URI for the feature service
        private string _featureService = "https://sampleserver6.arcgisonline.com/arcgis/rest/services/Energy/Geology/FeatureServer/";

        // Hold the current zoom state
        private bool _zoomed;

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

            Title = "Feature layer rendering mode (Scene)";

            // Create the UI, setup the control references and execute initialization
            CreateLayout();
            Initialize();
        }

        private void Initialize()
        {
            // Initialize the cameras (viewpoints) with two points.
            _zoomedOutCamera = new Camera(_zoomedOutPoint, 42000, 0, 0, 0);
            _zoomedInCamera = new Camera(_zoomedInPoint, 2500, 90, 75, 0);

            // Create the scene for displaying the feature layer in static mode.
            Scene staticScene = new Scene
            {
                InitialViewpoint = new Viewpoint(_zoomedOutPoint, _zoomedOutCamera)
            };

            // Create the scene for displaying the feature layer in dynamic mode.
            Scene dynamicScene = new Scene
            {
                InitialViewpoint = new Viewpoint(_zoomedOutPoint, _zoomedOutCamera)
            };

            foreach (string identifier in new[] {"8", "9", "0"})
            {
                // Create the table.
                ServiceFeatureTable serviceTable = new ServiceFeatureTable(new Uri(_featureService + identifier));

                // Create and add the static layer.
                FeatureLayer staticLayer = new FeatureLayer(serviceTable)
                {
                    RenderingMode = FeatureRenderingMode.Static
                };
                staticScene.OperationalLayers.Add(staticLayer);

                // Create and add the dynamic layer.
                FeatureLayer dynamicLayer = (FeatureLayer)staticLayer.Clone();
                dynamicLayer.RenderingMode = FeatureRenderingMode.Dynamic;
                dynamicScene.OperationalLayers.Add(dynamicLayer);
            }

            // Add the scenes to the scene views.
            _myStaticSceneView.Scene = staticScene;
            _myDynamicSceneView.Scene = dynamicScene;
        }

        private void CreateLayout()
        {
            // Show the layout in the app
            SetContentView(Resource.Layout.FeatureLayerRenderingModeScene);

            // Get the views
            _myStaticSceneView = FindViewById<SceneView>(Resource.Id.flrms_staticSceneView);
            _myDynamicSceneView = FindViewById<SceneView>(Resource.Id.flrms_dynamicSceneView);

            // Get the button
            Button zoomButton = FindViewById<Button>(Resource.Id.flrms_zoomButton);

            // Subscribe to zoom button events
            zoomButton.Click += ZoomButton_Click;

        }

        private void ZoomButton_Click(object sender, System.EventArgs e)
        {
            // Zoom out if zoomed
            if (_zoomed)
            {
                _myStaticSceneView.SetViewpointCameraAsync(_zoomedOutCamera, new TimeSpan(0, 0, 5));
                _myDynamicSceneView.SetViewpointCameraAsync(_zoomedOutCamera, new TimeSpan(0, 0, 5));
            }
            else // Zoom in otherwise
            {
                _myStaticSceneView.SetViewpointCameraAsync(_zoomedInCamera, new TimeSpan(0, 0, 5));
                _myDynamicSceneView.SetViewpointCameraAsync(_zoomedInCamera, new TimeSpan(0, 0, 5));
            }

            // Toggle zoom state
            _zoomed = !_zoomed;
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:id="@+id/gridLayout1">
    <TextView
        android:text="Static:"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
    <Esri.ArcGISRuntime.UI.Controls.SceneView
        android:id="@+id/flrms_staticSceneView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1" />
    <TextView
        android:text="Dynamic:"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
    <Esri.ArcGISRuntime.UI.Controls.SceneView
        android:id="@+id/flrms_dynamicSceneView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1" />
    <Button
        android:text="Animated Zoom"
        android:id="@+id/flrms_zoomButton"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

// 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.

using Esri.ArcGISRuntime.Data;
using Esri.ArcGISRuntime.Geometry;
using Esri.ArcGISRuntime.Mapping;
using System;
using Xamarin.Forms;

namespace ArcGISRuntime.Samples.FeatureLayerRenderingModeScene
{
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        "Feature layer rendering mode (Scene)",
        "Layers",
        "This sample demonstrates how to use load settings to change the preferred rendering mode for a scene. Static rendering mode only redraws features periodically when a sceneview is navigating, while dynamic mode dynamically re-renders as the scene moves.",
        "Press the 'Animated Zoom' button to trigger a zoom. Observe the differences between the two scenes.")]
    public partial class FeatureLayerRenderingModeScene : ContentPage
    {
        // Points for demonstrating zoom
        private readonly MapPoint _zoomedOutPoint = new MapPoint(-118.37, 34.46, SpatialReferences.Wgs84);
        private readonly MapPoint _zoomedInPoint = new MapPoint(-118.45, 34.395, SpatialReferences.Wgs84);

        // Viewpoints for each zoom level
        private Camera _zoomedOutCamera;
        private Camera _zoomedInCamera;

        // URI for the feature service
        private const string FeatureService = "https://sampleserver6.arcgisonline.com/arcgis/rest/services/Energy/Geology/FeatureServer/";

        // Hold the current zoom state
        private bool _zoomed;

        public FeatureLayerRenderingModeScene()
        {
            InitializeComponent();

            Title = "Feature layer rendering mode (Scene)";

            // Create the UI, setup the control references and execute initialization
            Initialize();
        }

        private void Initialize()
        {
            // Initialize the cameras (viewpoints) with two points.
            _zoomedOutCamera = new Camera(_zoomedOutPoint, 42000, 0, 0, 0);
            _zoomedInCamera = new Camera(_zoomedInPoint, 2500, 90, 75, 0);

            // Create the scene for displaying the feature layer in static mode.
            Scene staticScene = new Scene
            {
                InitialViewpoint = new Viewpoint(_zoomedOutPoint, _zoomedOutCamera)
            };

            // Create the scene for displaying the feature layer in dynamic mode.
            Scene dynamicScene = new Scene
            {
                InitialViewpoint = new Viewpoint(_zoomedOutPoint, _zoomedOutCamera)
            };

            foreach (string identifier in new[] {"8", "9", "0"})
            {
                // Create the table.
                ServiceFeatureTable serviceTable = new ServiceFeatureTable(new Uri(FeatureService + identifier));

                // Create and add the static layer.
                FeatureLayer staticLayer = new FeatureLayer(serviceTable)
                {
                    RenderingMode = FeatureRenderingMode.Static
                };
                staticScene.OperationalLayers.Add(staticLayer);

                // Create and add the dynamic layer.
                FeatureLayer dynamicLayer = (FeatureLayer)staticLayer.Clone();
                dynamicLayer.RenderingMode = FeatureRenderingMode.Dynamic;
                dynamicScene.OperationalLayers.Add(dynamicLayer);
            }

            // Add the scenes to the scene views.
            MyStaticSceneView.Scene = staticScene;
            MyDynamicSceneView.Scene = dynamicScene;
        }

        private void Button_Clicked(object sender, EventArgs e)
        {
            // Zoom out if zoomed
            if (_zoomed)
            {
                MyStaticSceneView.SetViewpointCameraAsync(_zoomedOutCamera, new TimeSpan(0, 0, 5));
                MyDynamicSceneView.SetViewpointCameraAsync(_zoomedOutCamera, new TimeSpan(0, 0, 5));
            }
            else // Zoom in otherwise
            {
                MyStaticSceneView.SetViewpointCameraAsync(_zoomedInCamera, new TimeSpan(0, 0, 5));
                MyDynamicSceneView.SetViewpointCameraAsync(_zoomedInCamera, new TimeSpan(0, 0, 5));
            }

            // Toggle zoom state
            _zoomed = !_zoomed;
        }
    }
}

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:esriUI="clr-namespace:Esri.ArcGISRuntime.Xamarin.Forms;assembly=Esri.ArcGISRuntime.Xamarin.Forms"
             x:Class="ArcGISRuntime.Samples.FeatureLayerRenderingModeScene.FeatureLayerRenderingModeScene">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="auto" />
            <RowDefinition Height="*" />
            <RowDefinition Height="auto" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="*" />
        </Grid.ColumnDefinitions>
        <Label Text="Static Mode:" TextColor="Red" Grid.Row="0" Grid.ColumnSpan="2" />
        <esriUI:SceneView x:Name="MyStaticSceneView" Grid.Row="1" Grid.ColumnSpan="2" />
        <Label Text="Dynamic Mode:" TextColor="Red" Grid.Row="2" Grid.Column="0" />
        <Button Text="Animated Zoom" Clicked="Button_Clicked" Grid.Row="2" Grid.Column="1" />
        <esriUI:SceneView x:Name="MyDynamicSceneView" Grid.Row="3" Grid.ColumnSpan="2" />
    </Grid>
</ContentPage>