/// <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> The function which reads the image stream and adapts the request parameters. </summary>
/// <param name="left"> Left bound of the displayed map section. </param>
/// <param name="top"> Top bound of the displayed map section. </param>
/// <param name="right"> Right bound of the displayed map section. </param>
/// <param name="bottom"> Bottom bound of the displayed map section. </param>
/// <param name="width"> Width of the displayed map section. </param>
/// <param name="height"> Height of the displayed map section. </param>
/// <returns> The map image as a stream. </returns>
public Stream GetImageStream(double left, double top, double right, double bottom, int width, int height)
{
try
{
if (left >= minX && right <= maxX && top >= minY && bottom <= maxY)
{
return(GetImageStreamInternal(left, top, right, bottom, width, height));
}
double leftClipped = Math.Max(left, minX);
double rightClipped = Math.Min(right, maxX);
double topClipped = Math.Max(top, minY);
double bottomClipped = Math.Min(bottom, maxY);
double rWidth = width * ((rightClipped - leftClipped) / (right - left));
double rHeight = height * ((bottomClipped - topClipped) / (bottom - top));
if (rWidth < 32 || rHeight < 32)
{
var ms = new MemoryStream();
Bitmap bmp = new Bitmap(width, height);
bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
ms.Seek(0, SeekOrigin.Begin);
return(ms);
}
using (var stream = GetImageStreamInternal(leftClipped, topClipped, rightClipped, bottomClipped, (int)rWidth, (int)rHeight))
// bitmapCache has to be converted to png. Silverlight doesn't support gif!?
using (var img = Image.FromStream(stream))
using (Bitmap bmp = new Bitmap(width, height))
{
using (Graphics g = Graphics.FromImage(bmp))
{
double offsetX = (leftClipped - left) / (right - left) * width;
double offsetY = (bottomClipped - bottom) / (top - bottom) * height;
g.DrawImageUnscaled(img, (int)Math.Ceiling(offsetX), (int)Math.Ceiling(offsetY));
}
// save to memory stream
var ms = new MemoryStream();
bmp.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
ms.Seek(0, SeekOrigin.Begin);
return(ms);
}
}
catch (Exception exception)
{
return(TileExceptionHandler.RenderException(exception, width, height));
}
}
/// <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));
}
}
/// <summary> Retrieves the map image from the xMapServer and returns it as a stream. </summary>
/// <param name="left"> Left coordinates. </param>
/// <param name="top"> Top coordinates. </param>
/// <param name="right"> Right coordinates. </param>
/// <param name="bottom"> Bottom coordinates. </param>
/// <param name="width"> Width of the image. </param>
/// <param name="height"> Height of the image. </param>
/// <param name="mapObjects"> Set of map objects. </param>
/// <returns> The map image as stream. </returns>
public Stream GetStreamInternal(double left, double top, double right, double bottom, int width, int height, out IEnumerable <IMapObject> mapObjects)
{
mapObjects = null;
int trials = 0;
while (true)
{
try
{
var imageStream = new MemoryStream(TryGetStreamInternal(left, top, right, bottom, width, height, out mapObjects));
if (!needsTransparency)
{
return(imageStream);
}
using (var image = System.Drawing.Image.FromStream(imageStream))
{
var bmp = image as System.Drawing.Bitmap;
// make map background color transparent
bmp?.MakeTransparent(System.Drawing.Color.FromArgb(255, 254, 185));
return(SaveAndConvert(bmp));
}
}
catch (WebException ex)
{
var res = (HttpWebResponse)ex.Response;
if (res != null && res.StatusCode != HttpStatusCode.InternalServerError && res.StatusCode != HttpStatusCode.ServiceUnavailable)
{
return(TileExceptionHandler.RenderException(ex, width, height));
}
if (++trials >= 3)
{
return(TileExceptionHandler.RenderException(ex, width, height));
}
System.Threading.Thread.Sleep(50);
}
catch (Exception ex)
{
return(TileExceptionHandler.RenderException(ex, width, height));
}
}
}
/// <inheritdoc/>
public Stream GetImageStream(int tileX, int tileY, int zoom)
{
try { return(ReadURL(RequestBuilderDelegate(tileX, tileY, zoom))); }
catch (Exception exception) { return(TileExceptionHandler.RenderException(exception, 256, 256)); }
}
