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https://github.com/ClemensFischer/XAML-Map-Control.git
synced 2026-04-06 06:55:04 +00:00
Added WorldMercatorProjection, fixed bounding box problems when changing projection.
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2f123886ff
commit
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21 changed files with 586 additions and 469 deletions
110
MapControl/WPF/ImageLoader.WPF.cs
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110
MapControl/WPF/ImageLoader.WPF.cs
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// XAML Map Control - https://github.com/ClemensFischer/XAML-Map-Control
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// © 2017 Clemens Fischer
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// Licensed under the Microsoft Public License (Ms-PL)
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using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.IO;
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using System.Linq;
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using System.Net.Http;
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using System.Net.Http.Headers;
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using System.Threading.Tasks;
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using System.Windows.Media;
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using System.Windows.Media.Imaging;
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namespace MapControl
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{
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public static class ImageLoader
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{
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/// <summary>
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/// The HttpClient instance used when image data is downloaded from a web resource.
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/// </summary>
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public static HttpClient HttpClient { get; set; } = new HttpClient();
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public static async Task<ImageSource> LoadImageAsync(Uri uri, bool isTileImage)
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{
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if (!uri.IsAbsoluteUri || uri.Scheme == "file")
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{
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return await LoadLocalImageAsync(uri);
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}
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if (uri.Scheme == "http")
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{
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return await LoadHttpImageAsync(uri, isTileImage);
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}
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return new BitmapImage(uri);
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}
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public static Task<ImageSource> LoadLocalImageAsync(Uri uri)
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{
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return Task.Run(() =>
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{
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var path = uri.IsAbsoluteUri ? uri.LocalPath : uri.OriginalString;
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if (!File.Exists(path))
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{
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return null;
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}
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using (var stream = new FileStream(path, FileMode.Open, FileAccess.Read))
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{
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return (ImageSource)BitmapFrame.Create(stream, BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
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}
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});
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}
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public static async Task<ImageSource> LoadHttpImageAsync(Uri uri, bool isTileImage)
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{
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using (var response = await HttpClient.GetAsync(uri))
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{
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if (!response.IsSuccessStatusCode)
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{
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Debug.WriteLine("ImageLoader: {0}: {1} {2}", uri, (int)response.StatusCode, response.ReasonPhrase);
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}
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else if (!isTileImage || IsTileAvailable(response.Headers))
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{
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using (var stream = new MemoryStream())
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{
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await response.Content.CopyToAsync(stream);
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stream.Seek(0, SeekOrigin.Begin);
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return BitmapFrame.Create(stream, BitmapCreateOptions.None, BitmapCacheOption.OnLoad);
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}
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}
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return null;
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}
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}
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public static async Task<bool> LoadHttpTileImageAsync(Uri uri, Func<MemoryStream, TimeSpan?, Task> tileCallback)
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{
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using (var response = await HttpClient.GetAsync(uri))
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{
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if (!response.IsSuccessStatusCode)
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{
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Debug.WriteLine("ImageLoader: {0}: {1} {2}", uri, (int)response.StatusCode, response.ReasonPhrase);
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}
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else if (IsTileAvailable(response.Headers))
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{
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var stream = new MemoryStream();
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await response.Content.CopyToAsync(stream);
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stream.Seek(0, SeekOrigin.Begin);
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await tileCallback(stream, response.Headers.CacheControl?.MaxAge);
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}
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return response.IsSuccessStatusCode;
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}
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}
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private static bool IsTileAvailable(HttpResponseHeaders responseHeaders)
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{
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IEnumerable<string> tileInfo;
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return !responseHeaders.TryGetValues("X-VE-Tile-Info", out tileInfo) || !tileInfo.Contains("no-tile");
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}
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}
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}
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