mirror of
https://github.com/ClemensFischer/XAML-Map-Control.git
synced 2025-12-06 07:12:04 +01:00
404 lines
14 KiB
C#
404 lines
14 KiB
C#
using Microsoft.Extensions.Logging;
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using System;
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using System.Collections.Generic;
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using System.Globalization;
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using System.Linq;
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using System.Threading.Tasks;
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using System.Xml.Linq;
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#if WPF
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using System.Windows;
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using System.Windows.Media;
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#elif UWP
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using Windows.UI.Xaml;
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using Windows.UI.Xaml.Media;
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#elif WINUI
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using Microsoft.UI.Xaml;
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using Microsoft.UI.Xaml.Media;
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#elif AVALONIA
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using Avalonia;
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using Avalonia.Interactivity;
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using ImageSource = Avalonia.Media.IImage;
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#endif
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namespace MapControl
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{
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/// <summary>
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/// Displays a single map image from a Web Map Service (WMS).
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/// </summary>
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public class WmsImageLayer : MapImageLayer
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{
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private static ILogger logger;
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private static ILogger Logger => logger ??= ImageLoader.LoggerFactory?.CreateLogger(typeof(WmsImageLayer));
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public static readonly DependencyProperty ServiceUriProperty =
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DependencyPropertyHelper.Register<WmsImageLayer, Uri>(nameof(ServiceUri), null,
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async (layer, oldValue, newValue) => await layer.UpdateImageAsync());
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public static readonly DependencyProperty RequestStylesProperty =
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DependencyPropertyHelper.Register<WmsImageLayer, string>(nameof(RequestStyles), "",
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async (layer, oldValue, newValue) => await layer.UpdateImageAsync());
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public static readonly DependencyProperty RequestLayersProperty =
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DependencyPropertyHelper.Register<WmsImageLayer, string>(nameof(RequestLayers), null,
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async (layer, oldValue, newValue) => await layer.UpdateImageAsync());
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/// <summary>
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/// The base request URL.
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/// </summary>
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public Uri ServiceUri
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{
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get => (Uri)GetValue(ServiceUriProperty);
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set => SetValue(ServiceUriProperty, value);
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}
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/// <summary>
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/// Comma-separated sequence of requested WMS Styles. Default is an empty string.
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/// </summary>
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public string RequestStyles
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{
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get => (string)GetValue(RequestStylesProperty);
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set => SetValue(RequestStylesProperty, value);
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}
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/// <summary>
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/// Comma-separated sequence of WMS Layer names to be displayed. If not set, the default Layer is displayed.
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/// </summary>
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public string RequestLayers
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{
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get => (string)GetValue(RequestLayersProperty);
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set => SetValue(RequestLayersProperty, value);
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}
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/// <summary>
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/// Gets a collection of all Layer names available in a WMS.
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/// </summary>
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public IReadOnlyCollection<string> AvailableLayers { get; private set; }
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private bool HasLayer =>
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RequestLayers != null ||
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AvailableLayers?.Count > 0 ||
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ServiceUri.Query?.IndexOf("LAYERS=", StringComparison.OrdinalIgnoreCase) > 0;
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public WmsImageLayer()
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{
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Loaded += OnLoaded;
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}
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private async void OnLoaded(object sender, RoutedEventArgs e)
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{
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Loaded -= OnLoaded;
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if (ServiceUri != null && !HasLayer)
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{
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await InitializeAsync();
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if (AvailableLayers != null && AvailableLayers.Count > 0)
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{
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await UpdateImageAsync();
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}
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}
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}
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/// <summary>
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/// Initializes the AvailableLayers and SupportedCrsIds properties.
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/// Calling this method is only necessary when no layer name is known in advance.
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/// It is called internally in a Loaded event handler when the RequestLayers and AvailableLayers
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/// properties are null and the ServiceUri.Query part does not contain a LAYERS parameter.
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/// </summary>
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public async Task InitializeAsync()
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{
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var capabilities = await GetCapabilitiesAsync();
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if (capabilities != null)
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{
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var ns = capabilities.Name.Namespace;
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var capability = capabilities.Element(ns + "Capability");
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SupportedCrsIds = capability
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.Descendants(ns + "Layer")
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.Descendants(ns + "CRS")
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.Select(e => e.Value)
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.ToList();
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AvailableLayers = capability
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.Descendants(ns + "Layer")
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.Select(e => e.Element(ns + "Name")?.Value)
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.Where(n => !string.IsNullOrEmpty(n))
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.ToList();
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}
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}
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/// <summary>
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/// Loads an XElement from the URL returned by GetCapabilitiesRequestUri().
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/// </summary>
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public async Task<XElement> GetCapabilitiesAsync()
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{
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XElement element = null;
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if (ServiceUri != null)
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{
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var uri = GetCapabilitiesRequestUri();
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if (uri != null)
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{
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try
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{
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using var stream = await ImageLoader.HttpClient.GetStreamAsync(uri);
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element = await XDocument.LoadRootElementAsync(stream);
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}
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catch (Exception ex)
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{
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Logger?.LogError(ex, "Failed reading capabilities from {uri}", uri);
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}
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}
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}
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return element;
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}
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/// <summary>
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/// Gets a response string from the URL returned by GetFeatureInfoRequestUri().
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/// </summary>
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public async Task<string> GetFeatureInfoAsync(Point position, string format = "text/plain")
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{
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string response = null;
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if (ServiceUri != null &&
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HasLayer &&
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ParentMap?.MapProjection != null &&
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ParentMap.ActualWidth > 0d &&
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ParentMap.ActualHeight > 0d)
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{
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var boundingBox = ParentMap.ViewRectToBoundingBox(new Rect(0d, 0d, ParentMap.ActualWidth, ParentMap.ActualHeight));
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var uri = GetFeatureInfoRequestUri(boundingBox, position, format);
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if (uri != null)
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{
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try
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{
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response = await ImageLoader.HttpClient.GetStringAsync(uri);
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}
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catch (Exception ex)
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{
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Logger?.LogError(ex, "Failed reading feature info from {uri}", uri);
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}
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}
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}
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return response;
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}
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/// <summary>
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/// Loads an ImageSource from the URL returned by GetMapRequestUri().
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/// </summary>
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protected override async Task<ImageSource> GetImageAsync(BoundingBox boundingBox, IProgress<double> progress)
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{
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ImageSource image = null;
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if (ServiceUri != null && HasLayer)
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{
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if (boundingBox.West >= -180d && boundingBox.East <= 180d ||
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ParentMap.MapProjection.Type > MapProjectionType.NormalCylindrical)
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{
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var uri = GetMapRequestUri(boundingBox);
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if (uri != null)
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{
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try
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{
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image = await ImageLoader.LoadImageAsync(new Uri(uri), progress);
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}
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catch (Exception ex)
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{
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Logger?.LogError(ex, "ImageLoader.LoadImageAsync");
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}
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}
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}
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else
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{
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BoundingBox bbox1, bbox2;
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if (boundingBox.West < -180d)
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{
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bbox1 = new BoundingBox(boundingBox.South, boundingBox.West + 360, boundingBox.North, 180d);
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bbox2 = new BoundingBox(boundingBox.South, -180d, boundingBox.North, boundingBox.East);
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}
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else
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{
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bbox1 = new BoundingBox(boundingBox.South, boundingBox.West, boundingBox.North, 180d);
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bbox2 = new BoundingBox(boundingBox.South, -180d, boundingBox.North, boundingBox.East - 360d);
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}
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var uri1 = GetMapRequestUri(bbox1);
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var uri2 = GetMapRequestUri(bbox2);
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if (uri1 != null && uri2 != null)
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{
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try
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{
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image = await ImageLoader.LoadMergedImageAsync(new Uri(uri1), new Uri(uri2), progress);
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}
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catch (Exception ex)
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{
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Logger?.LogError(ex, "ImageLoader.LoadMergedImageAsync");
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}
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}
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}
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}
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return image;
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}
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/// <summary>
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/// Returns a GetCapabilities request URL string.
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/// </summary>
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protected virtual string GetCapabilitiesRequestUri()
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{
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return GetRequestUri(new Dictionary<string, string>
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{
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{ "SERVICE", "WMS" },
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{ "VERSION", "1.3.0" },
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{ "REQUEST", "GetCapabilities" }
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});
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}
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/// <summary>
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/// Returns a GetMap request URL string.
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/// </summary>
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protected virtual string GetMapRequestUri(BoundingBox boundingBox)
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{
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string uri = null;
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var bbox = ParentMap.MapProjection.BoundingBoxToMap(boundingBox);
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if (bbox.HasValue)
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{
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var width = ParentMap.ViewTransform.Scale * bbox.Value.Width;
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var height = ParentMap.ViewTransform.Scale * bbox.Value.Height;
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uri = GetRequestUri(new Dictionary<string, string>
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{
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{ "SERVICE", "WMS" },
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{ "VERSION", "1.3.0" },
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{ "REQUEST", "GetMap" },
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{ "LAYERS", RequestLayers ?? AvailableLayers?.FirstOrDefault() ?? "" },
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{ "STYLES", RequestStyles ?? "" },
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{ "FORMAT", "image/png" },
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{ "CRS", GetCrsValue() },
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{ "BBOX", GetBboxValue(boundingBox, bbox.Value) },
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{ "WIDTH", Math.Round(width).ToString("F0") },
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{ "HEIGHT", Math.Round(height).ToString("F0") }
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});
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}
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return uri;
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}
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/// <summary>
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/// Returns a GetFeatureInfo request URL string.
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/// </summary>
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protected virtual string GetFeatureInfoRequestUri(BoundingBox boundingBox, Point position, string format)
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{
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string uri = null;
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var bbox = ParentMap.MapProjection.BoundingBoxToMap(boundingBox);
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if (bbox.HasValue)
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{
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var width = ParentMap.ViewTransform.Scale * bbox.Value.Width;
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var height = ParentMap.ViewTransform.Scale * bbox.Value.Height;
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var transform = ViewTransform.CreateTransformMatrix(
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-ParentMap.ActualWidth / 2d, -ParentMap.ActualWidth / 2d,
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-ParentMap.ViewTransform.Rotation,
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width / 2d, height / 2d);
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var imagePos = transform.Transform(position);
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var queryParameters = new Dictionary<string, string>
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{
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{ "SERVICE", "WMS" },
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{ "VERSION", "1.3.0" },
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{ "REQUEST", "GetFeatureInfo" },
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{ "LAYERS", RequestLayers ?? AvailableLayers?.FirstOrDefault() ?? "" },
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{ "STYLES", RequestStyles ?? "" },
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{ "FORMAT", "image/png" },
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{ "INFO_FORMAT", format },
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{ "CRS", GetCrsValue() },
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{ "BBOX", GetBboxValue(boundingBox, bbox.Value) },
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{ "WIDTH", Math.Round(width).ToString("F0") },
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{ "HEIGHT", Math.Round(height).ToString("F0") },
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{ "I", Math.Round(imagePos.X).ToString("F0") },
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{ "J", Math.Round(imagePos.Y).ToString("F0") }
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};
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// GetRequestUri may modify queryParameters["LAYERS"]
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//
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uri = GetRequestUri(queryParameters) + "&QUERY_LAYERS=" + queryParameters["LAYERS"];
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}
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return uri;
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}
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protected virtual string GetCrsValue()
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{
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var projection = ParentMap.MapProjection;
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var crs = projection.CrsId;
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if (crs.StartsWith("AUTO2:") || crs.StartsWith("AUTO:"))
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{
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crs = string.Format(CultureInfo.InvariantCulture, "{0},1,{1},{2}", crs, projection.Center.Longitude, projection.Center.Latitude);
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}
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return crs;
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}
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protected virtual string GetBboxValue(BoundingBox boundingBox, Rect mapBoundingBox)
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{
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var crs = ParentMap.MapProjection.CrsId;
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string format;
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double x1, y1, x2, y2;
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if (crs == "CRS:84" || crs == "EPSG:4326")
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{
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format = crs == "CRS:84" ? "{0:F8},{1:F8},{2:F8},{3:F8}" : "{1:F8},{0:F8},{3:F8},{2:F8}";
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x1 = boundingBox.West;
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y1 = boundingBox.South;
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x2 = boundingBox.East;
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y2 = boundingBox.North;
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}
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else
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{
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format = "{0:F2},{1:F2},{2:F2},{3:F2}";
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x1 = mapBoundingBox.X;
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y1 = mapBoundingBox.Y;
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x2 = mapBoundingBox.X + mapBoundingBox.Width;
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y2 = mapBoundingBox.Y + mapBoundingBox.Height;
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}
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return string.Format(CultureInfo.InvariantCulture, format, x1, y1, x2, y2);
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}
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protected string GetRequestUri(IDictionary<string, string> queryParameters)
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{
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var query = ServiceUri.Query;
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if (!string.IsNullOrEmpty(query))
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{
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// Parameters from ServiceUri.Query take higher precedence than queryParameters.
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//
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foreach (var param in query.Substring(1).Split('&'))
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{
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var pair = param.Split('=');
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queryParameters[pair[0].ToUpper()] = pair.Length > 1 ? pair[1] : "";
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}
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}
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var uri = ServiceUri.GetLeftPart(UriPartial.Path) + "?"
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+ string.Join("&", queryParameters.Select(kv => kv.Key + "=" + kv.Value));
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return uri.Replace(" ", "%20");
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}
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}
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}
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