Hillshade renderer

<UserControl x:Class="ArcGIS.WinUI.Samples.RasterHillshade.RasterHillshade"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:esriUI="using:Esri.ArcGISRuntime.UI.Controls">
    <Grid>
        <esriUI:MapView x:Name="MyMapView" />
        <Border Style="{StaticResource BorderStyle}">
            <Grid>
                <Grid.ColumnDefinitions>
                    <ColumnDefinition />
                    <ColumnDefinition Width="2*" />
                </Grid.ColumnDefinitions>
                <Grid.RowDefinitions>
                    <RowDefinition />
                    <RowDefinition />
                    <RowDefinition />
                    <RowDefinition />
                </Grid.RowDefinitions>
                <TextBlock Grid.Row="0"
                           Grid.Column="0"
                           VerticalAlignment="Center"
                           Text="Slope type:"
                           TextAlignment="Right" />
                <ComboBox x:Name="SlopeTypeCombo"
                          Grid.Row="0"
                          Grid.Column="1"
                          Margin="5"
                          HorizontalAlignment="Stretch" />
                <TextBlock Grid.Row="1"
                           Grid.Column="0"
                           VerticalAlignment="Center"
                           Text="Altitude:"
                           TextAlignment="Right" />
                <Slider x:Name="AltitudeSlider"
                        Grid.Row="1"
                        Grid.Column="1"
                        Margin="5"
                        IsThumbToolTipEnabled="True"
                        Maximum="90"
                        Minimum="0" />
                <TextBlock Grid.Row="2"
                           Grid.Column="0"
                           VerticalAlignment="Center"
                           Text="Azimuth:"
                           TextAlignment="Right" />
                <Slider x:Name="AzimuthSlider"
                        Grid.Row="2"
                        Grid.Column="1"
                        Margin="5"
                        IsThumbToolTipEnabled="True"
                        Maximum="360"
                        Minimum="0" />
                <Button x:Name="ApplyHillshadeButton"
                        Grid.Row="3"
                        Grid.ColumnSpan="2"
                        Margin="5,0"
                        Padding="3"
                        HorizontalAlignment="Stretch"
                        VerticalAlignment="Center"
                        Click="ApplyHillshadeButton_Click"
                        Content="Apply hillshade" />
            </Grid>
        </Border>
    </Grid>
</UserControl>

// 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 ArcGIS.Samples.Managers;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Rasters;
using System;
using System.Threading.Tasks;

namespace ArcGIS.WinUI.Samples.RasterHillshade
{
    [ArcGIS.Samples.Shared.Attributes.Sample(
        name: "Hillshade renderer",
        category: "Layers",
        description: "Apply a hillshade renderer to a raster.",
        instructions: "Choose and adjust the settings to update the hillshade renderer on the raster layer. The sample allows you to change the Altitude, Azimuth, and Slope Type.",
        tags: new[] { "altitude", "angle", "azimuth", "raster", "slope", "visualization" })]
    [ArcGIS.Samples.Shared.Attributes.OfflineData("ae9739163a76437ea02482e1a807b806")]
    public partial class RasterHillshade
    {
        // Constant to store a z-factor (conversion constant) applied to the hillshade.
        // If needed, this can be used to convert z-values to the same unit as the x/y coordinates or to apply a vertical exaggeration.
        private const double ZFactor = 1.0;

        // Constants to store the Pixel Size Power and Pixel Size Factor values.
        // Use these to account for altitude changes (scale) as the viewer zooms in and out (recommended when using worldwide datasets).
        private const double PixelSizePower = 1.0;

        private const double PixelSizeFactor = 1.0;

        // Constant to store the bit depth (pixel depth), which determines the range of values that the hillshade raster can store.
        private const int PixelBitDepth = 8;

        // Store a reference to the layer
        private RasterLayer _rasterLayer;

        public RasterHillshade()
        {
            InitializeComponent();

            // Set up the map and load the raster layer from a local file
            _ = Initialize();
        }

        private async Task Initialize()
        {
            // Create a map with a streets basemap
            Map map = new Map(BasemapStyle.ArcGISStreets);

            // Get the file name for the local raster dataset
            string filepath = GetRasterPath();

            // Load the raster file
            Raster rasterFile = new Raster(filepath);

            try
            {
                // Create and load a new raster layer to show the image
                _rasterLayer = new RasterLayer(rasterFile);
                await _rasterLayer.LoadAsync();

                // Enable the apply renderer button when the layer loads.
                ApplyHillshadeButton.IsEnabled = true;

                // Create a viewpoint with the raster's full extent
                Viewpoint fullRasterExtent = new Viewpoint(_rasterLayer.FullExtent);

                // Set the initial viewpoint for the map
                map.InitialViewpoint = fullRasterExtent;

                // Add the layer to the map
                map.OperationalLayers.Add(_rasterLayer);

                // Add the map to the map view
                MyMapView.Map = map;

                // Add slope type values to the combo box
                foreach (object slope in Enum.GetValues(typeof(SlopeType)))
                {
                    SlopeTypeCombo.Items.Add(slope.ToString());
                }

                // Select the "Scaled" slope type enum
                SlopeTypeCombo.SelectedIndex = 2;
            }
            catch (Exception e)
            {
                await new MessageDialog2(e.ToString(), "Error").ShowAsync();
            }
        }

        private void ApplyHillshadeButton_Click(object sender, Microsoft.UI.Xaml.RoutedEventArgs e)
        {
            // Get the current parameter values
            double altitude = AltitudeSlider.Value;
            double azimuth = AzimuthSlider.Value;
            SlopeType typeOfSlope = Enum.Parse<SlopeType>(SlopeTypeCombo.SelectedItem as string);

            // Create a hillshade renderer that uses the values selected by the user
            HillshadeRenderer hillshadeRenderer = new HillshadeRenderer(altitude, azimuth, ZFactor, typeOfSlope, PixelSizeFactor, PixelSizePower, PixelBitDepth);

            // Apply the new renderer to the raster layer
            _rasterLayer.Renderer = hillshadeRenderer;
        }

        private static string GetRasterPath()
        {
            return DataManager.GetDataFolder("ae9739163a76437ea02482e1a807b806", "srtm.tiff");
        }
    }
}