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Updated WMTS implementation

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ClemensF 2020-04-15 20:46:16 +02:00
parent 375c5d0b58
commit 209d06adf5
6 changed files with 243 additions and 205 deletions
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MapControl/Shared/WmtsCapabilities.cs Normal file
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// XAML Map Control - https://github.com/ClemensFischer/XAML-Map-Control
// © 2020 Clemens Fischer
// Licensed under the Microsoft Public License (Ms-PL)
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Xml.Linq;
using System.Threading.Tasks;
#if !WINDOWS_UWP
using System.Windows;
#endif
namespace MapControl
{
public class WmtsCapabilities
{
public string LayerIdentifier { get; private set; }
public WmtsTileSource TileSource { get; private set; }
public List<WmtsTileMatrixSet> TileMatrixSets { get; private set; }
public static async Task<WmtsCapabilities> ReadCapabilities(Uri capabilitiesUri, string layerIdentifier)
{
WmtsCapabilities capabilities;
if (capabilitiesUri.IsAbsoluteUri && (capabilitiesUri.Scheme == "http" || capabilitiesUri.Scheme == "https"))
{
using (var stream = await ImageLoader.HttpClient.GetStreamAsync(capabilitiesUri))
{
capabilities = ReadCapabilities(XDocument.Load(stream).Root, layerIdentifier);
}
}
else
{
capabilities = ReadCapabilities(XDocument.Load(capabilitiesUri.ToString()).Root, layerIdentifier);
}
return capabilities;
}
public static WmtsCapabilities ReadCapabilities(XElement capabilitiesElement, string layerIdentifier)
{
XNamespace ns = capabilitiesElement.Name.Namespace;
XNamespace ows = "http://www.opengis.net/ows/1.1";
var contentsElement = capabilitiesElement.Element(ns + "Contents");
if (contentsElement == null)
{
throw new ArgumentException("Contents element not found.");
}
XElement layerElement;
if (!string.IsNullOrEmpty(layerIdentifier))
{
layerElement = contentsElement.Descendants(ns + "Layer")
.FirstOrDefault(e => e.Element(ows + "Identifier")?.Value == layerIdentifier);
if (layerElement == null)
{
throw new ArgumentException("Layer element \"" + layerIdentifier + "\" not found.");
}
}
else
{
layerElement = capabilitiesElement.Descendants(ns + "Layer").FirstOrDefault();
if (layerElement == null)
{
throw new ArgumentException("No Layer element found.");
}
layerIdentifier = layerElement.Element(ows + "Identifier")?.Value ?? "";
}
var urlTemplate = layerElement.Element(ns + "ResourceURL")?.Attribute("template")?.Value;
if (string.IsNullOrEmpty(urlTemplate))
{
throw new ArgumentException("No valid ResourceURL element found in Layer \"" + layerIdentifier + "\".");
}
var styleElement = layerElement.Descendants(ns + "Style")
.FirstOrDefault(e => e.Attribute("isDefault")?.Value == "true");
if (styleElement == null)
{
styleElement = layerElement.Descendants(ns + "Style").FirstOrDefault();
}
var style = styleElement?.Element(ows + "Identifier")?.Value;
if (string.IsNullOrEmpty(style))
{
throw new ArgumentException("No valid Style element found in Layer \"" + layerIdentifier + "\".");
}
var tileMatrixSetIds = layerElement
.Descendants(ns + "TileMatrixSetLink")
.Select(e => e.Element(ns + "TileMatrixSet")?.Value)
.Where(id => !string.IsNullOrEmpty(id))
.ToList();
var tileMatrixSets = new List<WmtsTileMatrixSet>();
foreach (var tileMatrixSetId in tileMatrixSetIds)
{
var tileMatrixSetElement = capabilitiesElement.Descendants(ns + "TileMatrixSet")
.FirstOrDefault(e => e.Element(ows + "Identifier")?.Value == tileMatrixSetId);
if (tileMatrixSetElement == null)
{
throw new ArgumentException("Linked TileMatrixSet element not found in Layer \"" + layerIdentifier + "\".");
}
var tileMatrixSet = ReadTileMatrixSet(tileMatrixSetElement);
tileMatrixSets.Add(tileMatrixSet);
}
return new WmtsCapabilities
{
LayerIdentifier = layerIdentifier,
TileSource = new WmtsTileSource(urlTemplate.Replace("{Style}", style)),
TileMatrixSets = tileMatrixSets
};
}
public static WmtsTileMatrixSet ReadTileMatrixSet(XElement tileMatrixSetElement)
{
XNamespace ns = tileMatrixSetElement.Name.Namespace;
XNamespace ows = "http://www.opengis.net/ows/1.1";
var identifier = tileMatrixSetElement.Element(ows + "Identifier")?.Value;
if (string.IsNullOrEmpty(identifier))
{
throw new ArgumentException("No ows:Identifier element found in TileMatrixSet.");
}
var supportedCrs = tileMatrixSetElement.Element(ows + "SupportedCRS")?.Value;
if (string.IsNullOrEmpty(supportedCrs))
{
throw new ArgumentException("No ows:SupportedCRS element found in TileMatrixSet \"" + identifier + "\".");
}
var tileMatrixes = new List<WmtsTileMatrix>();
foreach (var tileMatrixElement in tileMatrixSetElement.Descendants(ns + "TileMatrix"))
{
tileMatrixes.Add(ReadTileMatrix(tileMatrixElement));
}
if (tileMatrixes.Count <= 0)
{
throw new ArgumentException("No TileMatrix elements found in TileMatrixSet \"" + identifier + "\".");
}
return new WmtsTileMatrixSet(identifier, supportedCrs, tileMatrixes);
}
public static WmtsTileMatrix ReadTileMatrix(XElement tileMatrixElement)
{
XNamespace ns = tileMatrixElement.Name.Namespace;
XNamespace ows = "http://www.opengis.net/ows/1.1";
var identifier = tileMatrixElement.Element(ows + "Identifier")?.Value;
if (string.IsNullOrEmpty(identifier))
{
throw new ArgumentException("No ows:Identifier element found in TileMatrix.");
}
string[] topLeftCornerStrings;
double scaleDenominator, top, left;
int tileWidth, tileHeight, matrixWidth, matrixHeight;
var valueString = tileMatrixElement.Element(ns + "ScaleDenominator")?.Value;
if (string.IsNullOrEmpty(valueString) ||
!double.TryParse(valueString, NumberStyles.Float, CultureInfo.InvariantCulture, out scaleDenominator))
{
throw new ArgumentException("No ScaleDenominator element found in TileMatrix \"" + identifier + "\".");
}
valueString = tileMatrixElement.Element(ns + "TopLeftCorner")?.Value;
if (string.IsNullOrEmpty(valueString) ||
(topLeftCornerStrings = valueString.Split(new char[] { ' ' }, StringSplitOptions.RemoveEmptyEntries)).Length < 2 ||
!double.TryParse(topLeftCornerStrings[0], NumberStyles.Float, CultureInfo.InvariantCulture, out left) ||
!double.TryParse(topLeftCornerStrings[1], NumberStyles.Float, CultureInfo.InvariantCulture, out top))
{
throw new ArgumentException("No TopLeftCorner element found in TileMatrix \"" + identifier + "\".");
}
valueString = tileMatrixElement.Element(ns + "TileWidth")?.Value;
if (string.IsNullOrEmpty(valueString) || !int.TryParse(valueString, out tileWidth))
{
throw new ArgumentException("No TileWidth element found in TileMatrix \"" + identifier + "\".");
}
valueString = tileMatrixElement.Element(ns + "TileHeight")?.Value;
if (string.IsNullOrEmpty(valueString) || !int.TryParse(valueString, out tileHeight))
{
throw new ArgumentException("No TileHeight element found in TileMatrix \"" + identifier + "\".");
}
valueString = tileMatrixElement.Element(ns + "MatrixWidth")?.Value;
if (string.IsNullOrEmpty(valueString) || !int.TryParse(valueString, out matrixWidth))
{
throw new ArgumentException("No MatrixWidth element found in TileMatrix \"" + identifier + "\".");
}
valueString = tileMatrixElement.Element(ns + "MatrixHeight")?.Value;
if (string.IsNullOrEmpty(valueString) || !int.TryParse(valueString, out matrixHeight))
{
throw new ArgumentException("No MatrixHeight element found in TileMatrix \"" + identifier + "\".");
}
return new WmtsTileMatrix(
identifier, scaleDenominator, new Point(left, top), tileWidth, tileHeight, matrixWidth, matrixHeight);
}
}
}