public bool TryGetMap(IViewport viewport, ref IRaster raster)
{
int width;
int height;
try
{
width = Convert.ToInt32(viewport.Width);
height = Convert.ToInt32(viewport.Height);
}
catch (OverflowException)
{
Trace.Write("Could not conver double to int (ExportMap size)");
return(false);
}
Client.WmsOnlineResource resource = GetPreferredMethod();
var uri = new Uri(GetRequestUrl(viewport.Extent, width, height));
WebRequest webRequest = WebRequest.Create(uri);
webRequest.Method = resource.Type;
webRequest.Timeout = TimeOut;
webRequest.Credentials = Credentials ?? CredentialCache.DefaultCredentials;
try
{
using (var webResponse = (HttpWebResponse)webRequest.GetResponse())
using (var dataStream = webResponse.GetResponseStream())
{
if (!webResponse.ContentType.StartsWith("image"))
{
return(false);
}
byte[] bytes = BruTile.Utilities.ReadFully(dataStream);
raster = new Raster(new MemoryStream(bytes), viewport.Extent);
}
return(true);
}
catch (WebException webEx)
{
if (!ContinueOnError)
{
throw (new RenderException(
"There was a problem connecting to the WMS server",
webEx));
}
Trace.Write("There was a problem connecting to the WMS server: " + webEx.Message);
}
catch (Exception ex)
{
if (!ContinueOnError)
{
throw (new RenderException("There was a problem while attempting to request the WMS", ex));
}
Trace.Write("There was a problem while attempting to request the WMS" + ex.Message);
}
return(false);
}
/// <summary>
/// Gets the URL for a map request base on current settings, the image size and boundingbox
/// </summary>
/// <returns>URL for WMS request</returns>
public string GetRequestUrl(BoundingBox box, int width, int height)
{
Client.WmsOnlineResource resource = GetPreferredMethod();
var strReq = new StringBuilder(resource.OnlineResource);
if (!resource.OnlineResource.Contains("?"))
{
strReq.Append("?");
}
if (!strReq.ToString().EndsWith("&") && !strReq.ToString().EndsWith("?"))
{
strReq.Append("&");
}
strReq.AppendFormat(CultureInfo.InvariantCulture, "REQUEST=GetMap&BBOX={0},{1},{2},{3}",
box.Min.X, box.Min.Y, box.Max.X, box.Max.Y);
strReq.AppendFormat("&WIDTH={0}&Height={1}", width, height);
strReq.Append("&Layers=");
if (LayerList != null && LayerList.Count > 0)
{
foreach (string layer in LayerList)
{
strReq.AppendFormat("{0},", layer);
}
strReq.Remove(strReq.Length - 1, 1);
}
strReq.AppendFormat("&FORMAT={0}", _mimeType);
if (SpatialReferenceSystem == string.Empty)
{
throw new ApplicationException("Spatial reference system not set");
}
strReq.AppendFormat(_wmsClient.WmsVersion != "1.3.0" ? "&SRS={0}" : "&CRS={0}", SpatialReferenceSystem);
strReq.AppendFormat("&VERSION={0}", _wmsClient.WmsVersion);
strReq.Append("&TRANSPARENT=true");
strReq.Append("&Styles=");
if (StylesList != null && StylesList.Count > 0)
{
foreach (string style in StylesList)
{
strReq.AppendFormat("{0},", style);
}
strReq.Remove(strReq.Length - 1, 1);
}
if (ExtraParams != null)
{
foreach (var extraParam in ExtraParams)
{
strReq.AppendFormat("&{0}={1}", extraParam.Key, extraParam.Value);
}
}
return(strReq.ToString());
}
