// load background map from wms
private void photoButton_Click(object sender, EventArgs e)
{
toolBuilder.addHeader("Background WMS", false);
// textbox for wms-server
TextBox server = toolBuilder.addTextboxWithCaption("WMS Server", "http://wms.geonorge.no/skwms1/wms.kartdata2");
// button for fetching available layers
Button connectButton = toolBuilder.addButton("Get layers");
toolBuilder.addLabel("Layers");
// dropdown for available layers
ComboBox wmsLayers = new ComboBox();
toolBuilder.addControl(wmsLayers);
wmsLayers.DropDownStyle = ComboBoxStyle.DropDownList;
// label for errors
toolBuilder.addErrorLabel();
// label for loading selected layer from wms
Button loadButton = toolBuilder.addButton("Load");
// button for clearing all loaded wms maps
Button clearButton = toolBuilder.addButton("Clear");
connectButton.Click += (o, e2) =>
{
// init progress bar
progressLabel.Text = "Loading layers";
progressBar.Style = ProgressBarStyle.Marquee;
XmlNodeList xmlnodes = null;
// perform connection in worker thread
BackgroundWorker bw = new BackgroundWorker();
bw.DoWork += (object wsender, DoWorkEventArgs we) =>
{
// create url
var par = "REQUEST=GetCapabilities&VERSION=1.1.1&service=WMS&format=text/xml";
if (!server.Text.EndsWith("?"))
server.Text += "?";
var url = server.Text + par;
var capab = "";
try
{
// get response from url
var request = System.Net.WebRequest.Create(url);
using (var response = request.GetResponse())
using (var stream = response.GetResponseStream())
{
capab = new StreamReader(stream).ReadToEnd();
}
}
// handle errors
catch (WebException ex)
{
if (ex.Status == WebExceptionStatus.ProtocolError)
{
var response = ex.Response as HttpWebResponse;
if (response != null)
{
int errorNum = (int)response.StatusCode;
if (errorNum == 504)
{
we.Result = "Server Timeout";
return;
}
we.Result = "Http Error " + errorNum;
}
}
we.Result = "Server Error";
return;
}
catch (Exception ex)
{
we.Result = "Server Error";
return;
}
// parse response as xml document
XmlDataDocument xmldoc = new XmlDataDocument();
xmldoc.LoadXml(capab);
xmlnodes = xmldoc.GetElementsByTagName("Name");
};
bw.RunWorkerCompleted += (object wsender, RunWorkerCompletedEventArgs we) =>
{
// add available layers to dropdown
wmsLayers.Items.Clear();
if (xmlnodes != null)
{
foreach (XmlNode n in xmlnodes)
if (n.ParentNode.Name == "Layer")
wmsLayers.Items.Add(n.InnerText);
if (wmsLayers.Items.Count > 0)
wmsLayers.SelectedIndex = 0;
toolBuilder.setError("");
}
else
toolBuilder.setError((string)we.Result);
// reset progress bar
progressLabel.Text = "";
progressBar.Style = ProgressBarStyle.Continuous;
};
bw.RunWorkerAsync();
};
loadButton.Click += (o, e2) =>
{
// create url request
var d = CultureInfo.InvariantCulture;
var b = ScreenManager.RealWindowsRect;
var sb = ScreenManager.MapRealToScreen(b);
var bbox = "BBOX=" + b.MinX.ToString(d) + "," + b.MinY.ToString(d) + "," + b.MaxX.ToString(d) + "," + b.MaxY.ToString(d) + "&WIDTH=" + sb.Width.ToString(d) + "&HEIGHT=" + sb.Height.ToString(d)+"&";
var srs = "SRS=EPSG:32633&";
var par = "STYLES=&FORMAT=image/png&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&";
if (wmsLayers.SelectedIndex == -1)
{
toolBuilder.setError("Select layer");
return;
}
var layerString = "LAYERS=" + wmsLayers.SelectedItem + "&";
if (!server.Text.EndsWith("?"))
server.Text += "?";
var url = server.Text + layerString + par + srs + bbox;
Photo p = null;
// init progress bar
progressLabel.Text = "Loading map";
progressBar.Style = ProgressBarStyle.Marquee;
// peform loading in worker thread
BackgroundWorker bw = new BackgroundWorker();
bw.DoWork += (object wsender, DoWorkEventArgs we) =>
{
// try loading bitmap from url response
try
{
var request = System.Net.WebRequest.Create(url);
using (var response = request.GetResponse())
{
using (var stream = response.GetResponseStream())
{
p = new Photo(Bitmap.FromStream(stream), b);
}
}
}
// handle errors
catch (WebException ex)
{
p = null;
if (ex.Status == WebExceptionStatus.ProtocolError)
{
var response = ex.Response as HttpWebResponse;
if (response != null)
{
int errorNum = (int)response.StatusCode;
if(errorNum == 504)
{
we.Result = "Server Timeout";
return;
}
we.Result = "Http Error " + errorNum;
}
}
we.Result = "Server Error";
return;
}
catch (Exception ex)
{
p = null;
we.Result = "Server Error";
return;
}
};
bw.RunWorkerCompleted += (object wsender, RunWorkerCompletedEventArgs we) =>
{
// update map if loading went ok
if (p != null)
{
photos.Add(p);
redraw();
toolBuilder.setError("");
}
else
toolBuilder.setError((string) we.Result);
// reset progress bar
progressLabel.Text = "";
progressBar.Style = ProgressBarStyle.Continuous;
};
bw.RunWorkerAsync();
};
// clear loaded maps
clearButton.Click += (o, e2) => {
photos.Clear();
redraw();
};
toolBuilder.reset();
}
// drawm wms-map
public void Draw(Photo p, Graphics gr)
{
Rectangle screenRect = MapRealToScreen(p.Bounds);
gr.DrawImage(p.Pic, screenRect);
}
