/// <summary> Retrieves the image of a certain map tile and returns it as image stream. </summary>
/// <param name="x"> X coordinate of the tile. </param>
/// <param name="y"> Y coordinate of the tile. </param>
/// <param name="zoom"> Zoom factor of the tile. </param>
/// <returns> Image stream of the specified tile. </returns>
public Stream GetImageStream(int x, int y, int zoom)
{
string tmpUrl = metaInfo.ImageUrl;
tmpUrl = tmpUrl.Replace("{subdomain}", metaInfo.ImageUrlSubDomains[(x ^ y) % metaInfo.ImageUrlSubDomains.Length]);
tmpUrl = tmpUrl.Replace("{quadkey}", GeoTransform.TileXYToQuadKey(x, y, zoom));
if (tmpUrl.Contains("{culture}"))
{
tmpUrl = tmpUrl.Replace("{culture}", Thread.CurrentThread.CurrentUICulture.Name.ToLower());
}
// append key
if (!string.IsNullOrEmpty(metaInfo.Key))
{
tmpUrl = tmpUrl + "&key=" + metaInfo.Key;
}
// n=z will return 404 if the tile is not available instead of the "no imagery" image.
tmpUrl = tmpUrl + "&n=z";
try
{
var request = (HttpWebRequest)WebRequest.Create(tmpUrl);
request.CachePolicy = new RequestCachePolicy(RequestCacheLevel.CacheIfAvailable);
request.KeepAlive = false;
return(request.GetResponse().GetResponseStream());
}
catch (Exception exception)
{
return(TileExceptionHandler.RenderException(exception, 256, 256));
}
}
/// <summary> Retrieves the image of a certain map tile and returns it as image stream. </summary>
/// <param name="x"> X coordinate of the tile. </param>
/// <param name="y"> Y coordinate of the tile. </param>
/// <param name="zoom"> Zoom factor of the tile. </param>
/// <returns> Image stream of the specified tile. </returns>
public Stream GetImageStream(int x, int y, int zoom)
{
string tmpUrl = metaInfo.ImageUrl;
tmpUrl = tmpUrl.Replace("{subdomain}", metaInfo.ImageUrlSubDomains[(x ^ y) % metaInfo.ImageUrlSubDomains.Length]);
tmpUrl = tmpUrl.Replace("{quadkey}", GeoTransform.TileXYToQuadKey(x, y, zoom));
if (tmpUrl.Contains("{culture}"))
{
tmpUrl = tmpUrl.Replace("{culture}", Thread.CurrentThread.CurrentUICulture.Name.ToLower());
}
// append key
if (!string.IsNullOrEmpty(metaInfo.Key))
{
tmpUrl = tmpUrl + "&key=" + metaInfo.Key;
}
// n=z will return 404 if the tile is not available instead of the "no imagery" image.
tmpUrl = tmpUrl + "&n=z";
try
{
var request = (HttpWebRequest)WebRequest.Create(tmpUrl);
request.CachePolicy = new RequestCachePolicy(RequestCacheLevel.CacheIfAvailable);
request.KeepAlive = false;
request.Proxy.Credentials = CredentialCache.DefaultCredentials;
return(request.GetResponse().GetResponseStream());
}
catch (WebException webException)
{
logger.Writeline(TraceEventType.Error, "WebException occured :" + Environment.NewLine + "Exception Message : " + webException.Message);
logger.Writeline(TraceEventType.Error, "URL :" + tmpUrl);
logger.Writeline(TraceEventType.Error, string.Format("WebException Status : {0}", webException.Status));
if (webException.Status == WebExceptionStatus.ProtocolError)
{
logger.Writeline(TraceEventType.Error, string.Format("Status Code : {0}", ((HttpWebResponse)webException.Response).StatusCode));
logger.Writeline(TraceEventType.Error, string.Format("Status Description : {0}", ((HttpWebResponse)webException.Response).StatusDescription));
}
return(TileExceptionHandler.RenderException(webException, 256, 256));
}
catch (Exception exception)
{
logger.Writeline(TraceEventType.Error, "Exception occured : " + Environment.NewLine + exception.Message);
return(TileExceptionHandler.RenderException(exception, 256, 256));
}
}
