private bool UpdateChildLayers(WmtsTileMatrixSet tileMatrixSet) { var layersChanged = false; var maxScale = 1.001 * ParentMap.ViewTransform.Scale; // avoid rounding issues // show all TileMatrix layers with Scale <= maxScale, at least the first layer // var currentMatrixes = tileMatrixSet.TileMatrixes .Where((matrix, i) => i == 0 || matrix.Scale <= maxScale) .ToList(); if (this != ParentMap.MapLayer) // do not load background tiles { currentMatrixes = currentMatrixes.Skip(currentMatrixes.Count - 1).ToList(); // last element only } else if (currentMatrixes.Count > MaxBackgroundLevels + 1) { currentMatrixes = currentMatrixes.Skip(currentMatrixes.Count - MaxBackgroundLevels - 1).ToList(); } var currentLayers = ChildLayers.Where(layer => currentMatrixes.Contains(layer.TileMatrix)).ToList(); Children.Clear(); foreach (var tileMatrix in currentMatrixes) { var layer = currentLayers.FirstOrDefault(l => l.TileMatrix == tileMatrix); if (layer == null) { layer = new WmtsTileMatrixLayer(tileMatrix, tileMatrixSet.TileMatrixes.IndexOf(tileMatrix)); layersChanged = true; } if (layer.SetBounds(ParentMap.ViewTransform, ParentMap.RenderSize)) { layersChanged = true; } Children.Add(layer); } return(layersChanged); }
private void ReadCapabilities(XElement capabilitiesElement) { TileMatrixSets.Clear(); 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(); 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 = WmtsTileMatrixSet.Create(tileMatrixSetElement); TileMatrixSets.Add(tileMatrixSet.SupportedCrs, tileMatrixSet); } TileSource = new WmtsTileSource(urlTemplate.Replace("{Style}", style)); UpdateTileLayer(); }