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();
}