/// <summary>
/// Builds the url for requesting tiles.
/// </summary>
/// <param name="key">Tile coordinate.</param>
/// <returns>Tile url.</returns>
public string GetTileUrl(MapSectionByTileKey key)
{
var url = new StringBuilder();
// derive url from SOAP service url
url.Append(this.url.Replace("/ws/", "/rest/"));
// append tile coordinate
url.AppendFormat("/tile/{0}/{1}/{2}", key.zoomLevel, key.x, key.y);
// setup and append the profile part of the request
url.AppendFormat("/{0}{1}", CustomProfile,
string.Join("", EffectiveXMapLayers.Select(layer => layer.AsProfileSuffix()).ToArray()));
// a valid object information sink requires us to request JSON
// But: If we're dealing with base layers only, we don't need to request object information.
if (MapObjectInformationSink != null && HasRealCustomLayers)
{
url.Append("/json");
}
// and finally append token authentication when set
if (AuthenticateWithToken)
{
url.AppendFormat("?xtok={0}", Password);
}
// return full url string
return(url.ToString());
}
/// <summary>
/// Requests a tile; Please refer to GetImageStream(int, int, int) for a description.
/// </summary>
/// <param name="key">The tile coordinate in form of a MapSectionByTileKey.</param>
/// <returns>The stream wrapping the tile image.</returns>
private Stream GetImageStream(MapSectionByTileKey key)
{
// create and initialize request
var req = WebRequest.Create(GetTileUrl(key));
req.Timeout = 8000;
// get response
var resp = req.GetResponse();
// return response as is if content type is not application/json
if (resp.ContentType != "application/json")
{
return(resp.GetResponseStream());
}
// response is in json format; we need to read and parse the json string
try
{
using (var reader = new StreamReader(resp.GetResponseStream()))
{
var jsonResponse = JSON.Parse(reader.ReadToEnd());
// parse the object information and call the object information sink, when set
MapObjectInformationSink?.Invoke(
ParseFeatures(jsonResponse),
new TileMapRectangle(key.x, key.y, key.zoomLevel),
new Size(256, 256)
);
// read and parse the image
return(new MemoryStream(Convert.FromBase64String(jsonResponse["image"].Value)));
}
}
// be sure to close reponse when done
finally { resp.Close(); }
}
