Create terrain surface from a local raster

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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 ArcGISRuntime;
using ArcGISRuntime.Samples.Managers;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.UI.Controls;
using Foundation;
using UIKit;

namespace ArcGISRuntimeXamarin.Samples.CreateTerrainSurfaceRaster
{
    [Register("CreateTerrainSurfaceRaster")]
    [ArcGISRuntime.Samples.Shared.Attributes.Sample(
        name: "Create terrain surface from a local raster",
        category: "Scene",
        description: "Set the terrain surface with elevation described by a raster file.",
        instructions: "When loaded, the sample will show a scene with a terrain surface applied. Pan and zoom to explore the scene and observe how the terrain surface allows visualizing elevation differences.",
        tags: new[] { "3D", "elevation", "raster", "surface", "terrain" })]
    [ArcGISRuntime.Samples.Shared.Attributes.OfflineData("98092369c4ae4d549bbbd45dba993ebc")]
    public class CreateTerrainSurfaceRaster : UIViewController
    {
        // Hold references to UI controls.
        private SceneView _mySceneView;

        public CreateTerrainSurfaceRaster()
        {
            Title = "Create terrain surface from a local raster";
        }

        private void Initialize()
        {
            // Create the scene.
            _mySceneView.Scene = new Scene(BasemapStyle.ArcGISImageryStandard);

            // Get the path to the elevation raster.
            string packagePath = DataManager.GetDataFolder("98092369c4ae4d549bbbd45dba993ebc", "MontereyElevation.dt2");

            // Create the elevation source from a list of paths.
            RasterElevationSource elevationSource = new RasterElevationSource(new[] {packagePath});

            // Create a surface to display the elevation source.
            Surface elevationSurface = new Surface();

            // Add the elevation source to the surface.
            elevationSurface.ElevationSources.Add(elevationSource);

            // Add the surface to the scene.
            _mySceneView.Scene.BaseSurface = elevationSurface;

            // Set an initial camera viewpoint.
            Camera camera = new Camera(36.51, -121.80, 300.0, 0, 70.0, 0.0);
            _mySceneView.SetViewpointCamera(camera);
        }

        public override void LoadView()
        {
            // Create the views.
            View = new UIView() { BackgroundColor = ApplicationTheme.BackgroundColor };

            _mySceneView = new SceneView();
            _mySceneView.TranslatesAutoresizingMaskIntoConstraints = false;

            // Add the views.
            View.AddSubviews(_mySceneView);

            // Lay out the views.
            NSLayoutConstraint.ActivateConstraints(new[]
            {
                _mySceneView.TopAnchor.ConstraintEqualTo(View.SafeAreaLayoutGuide.TopAnchor),
                _mySceneView.BottomAnchor.ConstraintEqualTo(View.BottomAnchor),
                _mySceneView.LeadingAnchor.ConstraintEqualTo(View.LeadingAnchor),
                _mySceneView.TrailingAnchor.ConstraintEqualTo(View.TrailingAnchor)
            });
        }

        public override void ViewDidLoad()
        {
            base.ViewDidLoad();
            Initialize();
        }
    }
}