Style geometry types with symbols

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// Copyright 2024 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.Geometry;
using Esri.ArcGISRuntime.Mapping;
using Esri.ArcGISRuntime.Symbology;
using Esri.ArcGISRuntime.UI;
using System.Reflection;
using Color = System.Drawing.Color;
using Grid = Microsoft.Maui.Controls.Grid;

namespace ArcGIS.Samples.StyleGeometryTypesWithSymbols
{
    [ArcGIS.Samples.Shared.Attributes.Sample(
        name: "Style geometry types with symbols",
        category: "Symbology",
        description: "Use a symbol to display a geometry on a map.",
        instructions: "Tap \"Edit Styles\" and select a geometry to edit with the picker. Use the controls to change the symbol properties for the geometry.",
        tags: new[] { "display", "fill", "graphics", "line", "marker", "overlay", "picture", "point", "symbol", "visualization" })]
    [ArcGIS.Samples.Shared.Attributes.OfflineData()]
    public partial class StyleGeometryTypesWithSymbols
    {
        // Item sources for the pickers.
        public List<SimpleMarkerSymbolStyle> SimpleMarkerSymbolStyles => Enum.GetValues(typeof(SimpleMarkerSymbolStyle)).Cast<SimpleMarkerSymbolStyle>().ToList();
        public List<SimpleLineSymbolStyle> SimpleLineSymbolStyles => Enum.GetValues(typeof(SimpleLineSymbolStyle)).Cast<SimpleLineSymbolStyle>().ToList();
        public List<SimpleFillSymbolStyle> SimpleFillSymbolStyles => Enum.GetValues(typeof(SimpleFillSymbolStyle)).Cast<SimpleFillSymbolStyle>().ToList();

        // Hold the selected graphic.
        private Graphic _selectedGraphic;

        // Flag indicating if styling should be applied to a polygon's fill or outline.
        private bool _stylingPolygonFill = true;

        public StyleGeometryTypesWithSymbols()
        {
            InitializeComponent();
            _ = Initialize();
        }

        private async Task Initialize()
        {
            // Create a new map with a topographic basemap initially centered on Woolgarston, England.
            MyMapView.Map = new Map(BasemapStyle.ArcGISTopographic)
            {
                InitialViewpoint = new Viewpoint(new MapPoint(-225e3, 6_553e3, SpatialReferences.WebMercator), 88e3)
            };

            // A graphics overlay for displaying the geometry graphics on the map view.
            var graphicsOverlay = new GraphicsOverlay();

            // Create the simple marker symbol for styling the point.
            var pointSymbol = new SimpleMarkerSymbol(SimpleMarkerSymbolStyle.Circle, Color.Purple, 12);

            // Create simple line symbol for styling the polyline.
            var polylineSymbol = new SimpleLineSymbol(SimpleLineSymbolStyle.Dash, Color.Red, 6);

            // Create the simple fill symbol for styling the polygon, including its outline.
            var polygonSymbol = new SimpleFillSymbol(SimpleFillSymbolStyle.ForwardDiagonal, Color.Blue,
                new SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.Green, 3));

            // Create a point graphic and add it to the graphics overlay.
            var point = new MapPoint(-225e3, 6_560e3, SpatialReferences.WebMercator);
            var pointGraphic = new Graphic(point, pointSymbol);
            graphicsOverlay.Graphics.Add(pointGraphic);

            // Create a polyline graphic and add it to the graphics overlay.
            var points = new MapPoint[2]
            {
                new MapPoint(-223e3, 6_559e3, SpatialReferences.WebMercator),
                new MapPoint(-227e3, 6_559e3, SpatialReferences.WebMercator)
            };
            var polyline = new Polyline(points, SpatialReferences.WebMercator);
            var polylineGraphic = new Graphic(polyline, polylineSymbol);
            graphicsOverlay.Graphics.Add(polylineGraphic);

            // Create a polygon graphic and add it to the graphics overlay.
            points = new MapPoint[4]
            {
                new MapPoint(-222e3, 6_558e3, SpatialReferences.WebMercator),
                new MapPoint(-228e3, 6_558e3, SpatialReferences.WebMercator),
                new MapPoint(-228e3, 6_555e3, SpatialReferences.WebMercator),
                new MapPoint(-222e3, 6_555e3, SpatialReferences.WebMercator)
            };
            var polygon = new Polygon(points, SpatialReferences.WebMercator);
            var polygonGraphic = new Graphic(polygon, polygonSymbol);
            graphicsOverlay.Graphics.Add(polygonGraphic);

            // Create a graphic with a picture marker symbol (image resource) and add it to the graphics overlay.
            var pinGraphic = await MakePictureMarkerSymbolFromImage(new MapPoint(-226_770, 6_550_470, SpatialReferences.WebMercator));
            graphicsOverlay.Graphics.Add(pinGraphic);

            // Create a graphic with a picture marker symbol (URL) and add it to the graphics overlay.
            var imageUri = new Uri("https://static.arcgis.com/images/Symbols/OutdoorRecreation/Camping.png");
            var campsiteSymbol = new PictureMarkerSymbol(imageUri)
            {
                Width = 25,
                Height = 25
            };
            var campsitePoint = new MapPoint(-223_560, 6_552_020, SpatialReferences.WebMercator);
            var campsiteGraphic = new Graphic(campsitePoint, campsiteSymbol);
            graphicsOverlay.Graphics.Add(campsiteGraphic);

            // Add the graphics overlay to the map view.
            MyMapView.GraphicsOverlays.Add(graphicsOverlay);

            // Setup bindings for the UI controls.
            PointSizeStepper.BindingContext = PointGrid.BindingContext = graphicsOverlay.Graphics[0];
            PolylineWidthStepper.BindingContext = PolylineGrid.BindingContext = graphicsOverlay.Graphics[1];
            PolygonOutlineWidthStepper.BindingContext = PolygonGrid.BindingContext = graphicsOverlay.Graphics[2];

            // Populate the color collection views with colors.
            var colors = new List<Color>()
            {
                Color.Red, Color.Orange, Color.Yellow, Color.Green, Color.Blue, Color.Purple
            };
            PointColorCollectionView.ItemsSource = PolylineColorCollectionView.ItemsSource =
                PolygonFillColorCollectionView.ItemsSource = PolygonOutlineColorCollectionView.ItemsSource = colors;

            // Set the style picker item sources.
            PointStylePicker.ItemsSource = SimpleMarkerSymbolStyles;
            PolygonOutlineStylePicker.ItemsSource = PolylineStylePicker.ItemsSource = SimpleLineSymbolStyles;
            PolygonFillStylePicker.ItemsSource = SimpleFillSymbolStyles;

            // Check the point radio button by default.
            PointRadioButton.IsChecked = true;

            // Set the selected styles to reflect the initial symbology.
            PointStylePicker.SelectedItem = SimpleMarkerSymbolStyle.Circle;
            PolylineStylePicker.SelectedItem = SimpleLineSymbolStyle.Dash;
            PolygonFillStylePicker.SelectedItem = SimpleFillSymbolStyle.ForwardDiagonal;
            PolygonOutlineStylePicker.SelectedItem = SimpleLineSymbolStyle.Solid;

            // Set the selected colors to reflect the initial symbology.
            PointColorCollectionView.SelectedItem = Color.Purple;
            PolylineColorCollectionView.SelectedItem = Color.Red;
            PolygonFillColorCollectionView.SelectedItem = Color.Blue;
            PolygonOutlineColorCollectionView.SelectedItem = Color.Green;

            // Subscribe to events for updating the UI now that initialization is complete.
            PointStylePicker.SelectedIndexChanged += StylePicker_SelectionChanged;
            PolylineStylePicker.SelectedIndexChanged += StylePicker_SelectionChanged;
            PolygonFillStylePicker.SelectedIndexChanged += PolygonFillStylePicker_SelectionChanged;
            PolygonOutlineStylePicker.SelectedIndexChanged += PolygonOutlineStylePicker_SelectionChanged;
            PointColorCollectionView.SelectionChanged += ColorCollectionView_SelectionChanged;
            PolylineColorCollectionView.SelectionChanged += ColorCollectionView_SelectionChanged;
            PolygonFillColorCollectionView.SelectionChanged += PolygonFillColorCollectionView_SelectionChanged;
            PolygonOutlineColorCollectionView.SelectionChanged += PolygonOutlineColorCollectionView_SelectionChanged;
        }

        private async Task<Graphic> MakePictureMarkerSymbolFromImage(MapPoint point)
        {
            // Hold a reference to the picture marker symbol.
            PictureMarkerSymbol pinSymbol;

            // Get current assembly that contains the image.
            Assembly currentAssembly = Assembly.GetExecutingAssembly();

            // Get the resource name of the blue pin star image
            string resourceStreamName = this.GetType().Assembly.GetManifestResourceNames().Single(str => str.EndsWith("pin_star_blue.png"));

            // Load the resource stream
            using (Stream resourceStream = this.GetType().Assembly.GetManifestResourceStream(resourceStreamName))
            {
                // Create new symbol using asynchronous factory method from stream.
                pinSymbol = await PictureMarkerSymbol.CreateAsync(resourceStream);
                pinSymbol.Width = 60;
                pinSymbol.Height = 60;
                // The image is a pin; offset the image so that the pinpoint is on the point rather than the image's true center.
                pinSymbol.LeaderOffsetX = 30;
                pinSymbol.OffsetY = 14;
            }

            return new Graphic(point, pinSymbol);
        }

        #region UI event handlers

        private void GeometryTypeRadioButton_CheckedChanged(object sender, CheckedChangedEventArgs e)
        {
            // Get the selected radio button.
            var radioButton = sender as RadioButton;

            // Get the binding context of the radio button.
            var grid = radioButton.BindingContext as Grid;

            // Collapse all grids.
            PointGrid.IsVisible = PolylineGrid.IsVisible = PolygonGrid.IsVisible = false;

            // Show the selected grid.
            grid.IsVisible = true;

            // Set the selected graphic based on the grid's binding context.
            _selectedGraphic = grid.BindingContext as Graphic;
        }

        private void StylePicker_SelectionChanged(object sender, EventArgs e)
        {
            // Get the selected picker item.
            var picker = sender as Picker;

            // Update the symbol style based on the selected picker item.
            switch (_selectedGraphic.Geometry.GeometryType)
            {
                case GeometryType.Point:
                    ((SimpleMarkerSymbol)_selectedGraphic.Symbol).Style = (SimpleMarkerSymbolStyle)picker.SelectedItem;
                    break;

                case GeometryType.Polyline:
                    ((SimpleLineSymbol)_selectedGraphic.Symbol).Style = (SimpleLineSymbolStyle)picker.SelectedItem;
                    break;

                case GeometryType.Polygon:
                    var symbol = (SimpleFillSymbol)_selectedGraphic.Symbol;
                    if (_stylingPolygonFill)
                    {
                        symbol.Style = (SimpleFillSymbolStyle)picker.SelectedItem;
                    }
                    else
                    {
                        symbol.Outline = new SimpleLineSymbol((SimpleLineSymbolStyle)picker.SelectedItem, symbol.Outline.Color, symbol.Outline.Width);
                    }
                    break;
            }
        }

        private void ColorCollectionView_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            // Selected graphic will be null when initializing the UI.
            if (_selectedGraphic == null) return;

            // Get the selected item.
            var color = (Color)((CollectionView)sender).SelectedItem;

            // Update the symbol color based on the selected geometry type.
            switch (_selectedGraphic.Geometry.GeometryType)
            {
                case GeometryType.Point:
                    ((SimpleMarkerSymbol)_selectedGraphic.Symbol).Color = color;
                    break;

                case GeometryType.Polyline:
                    ((SimpleLineSymbol)_selectedGraphic.Symbol).Color = color;
                    break;

                case GeometryType.Polygon:
                    var symbol = (SimpleFillSymbol)_selectedGraphic.Symbol;
                    if (_stylingPolygonFill)
                    {
                        symbol.Color = color;
                    }
                    else
                    {
                        symbol.Outline.Color = color;
                    }
                    break;
            }
        }

        private void SizeStepper_ValueChanged(object sender, ValueChangedEventArgs e)
        {
            // Selected graphic will be null when initializing the UI.
            if (_selectedGraphic == null) return;

            // Update the symbol size based on the sender's binding context.
            switch (_selectedGraphic.Geometry.GeometryType)
            {
                case GeometryType.Point:
                    ((SimpleMarkerSymbol)_selectedGraphic.Symbol).Size = e.NewValue;
                    PointSizeLabel.Text = $"Size: {e.NewValue}";
                    break;

                case GeometryType.Polyline:
                    ((SimpleLineSymbol)_selectedGraphic.Symbol).Width = e.NewValue;
                    PolylineWidthLabel.Text = $"Width: {e.NewValue}";
                    break;

                case GeometryType.Polygon:
                    ((SimpleFillSymbol)_selectedGraphic.Symbol).Outline.Width = e.NewValue;
                    PolygonOutlineWidthLabel.Text = $"Width: {e.NewValue}";
                    break;
            }
        }

        #region Polygon styling

        private void PolygonFillStylePicker_SelectionChanged(object sender, EventArgs e)
        {
            _stylingPolygonFill = true;
            StylePicker_SelectionChanged(sender, e);
        }

        private void PolygonOutlineStylePicker_SelectionChanged(object sender, EventArgs e)
        {
            _stylingPolygonFill = false;
            StylePicker_SelectionChanged(sender, e);
        }

        private void PolygonFillColorCollectionView_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            _stylingPolygonFill = true;
            ColorCollectionView_SelectionChanged(sender, e);
        }

        private void PolygonOutlineColorCollectionView_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            _stylingPolygonFill = false;
            ColorCollectionView_SelectionChanged(sender, e);
        }

        #endregion Polygon styling

        #endregion UI event handlers
    }
}