[mapguide-users] Thematic Mapping
Chris Claydon
chris.claydon at autodesk.com
Fri Jan 30 15:16:53 EST 2009
I would recommend modifying your call to InterpolateColor() so that the start color and end color correspond to the colors you want. They are currently both set to the same string.
-----Original Message-----
From: mapguide-users-bounces at lists.osgeo.org [mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of padmini godavarthi
Sent: Friday, January 30, 2009 3:59 AM
To: mapguide-users at lists.osgeo.org
Subject: [mapguide-users] Thematic Mapping
Hi,
iam using mpguide opensource 2.0 (.net 2.0 +IIS 5.1).
I want to do thematic mapping for polygon layer(for example parcel layer)
i tried to use the code in dotnetviewer sample.its working fine
iam able to create a thematic layer with same color to the all polygons.
Now my problem is that i want to apply different colours to the different
polygons
for example for parcel_id =1 ------------ green colour
for example for parcel_id =2 ------------ Red colour and
soon.........................
for this can u plz tell me the code for how to do it?
my code was as follows
------------------------------------------------------------------------------------------------------
NameValueCollection serverVars = Request.ServerVariables;
String strServerVars = "";
foreach (String str in serverVars.AllKeys)
{
strServerVars += "<br>" + str;
}
String platform = serverVars["SERVER_SOFTWARE"];
String queryStr = serverVars["QUERY_STRING"];
string queryStr1 = serverVars["Form"];
NameValueCollection requestParams = Request.HttpMethod == "POST" ?
Request.Form : Request.QueryString;
String sessionId = Request.QueryString["SESSION"];
string realPath = Request.ServerVariables["APPL_PHYSICAL_PATH"];
String configPath = realPath + "webconfig.ini";
MapGuideApi.MgInitializeWebTier(configPath);
MgUserInformation userInfo = new MgUserInformation(sessionId);
MgSiteConnection siteConnection = new MgSiteConnection();
siteConnection.Open(userInfo);
MgResourceService resourceService =
(MgResourceService)siteConnection.CreateService(MgServiceType.ResourceService);
MgFeatureService featureService =
(MgFeatureService)siteConnection.CreateService(MgServiceType.FeatureService);
MgMap map = new MgMap();
map.Open(resourceService, "mapdata");
MgLayerCollection layers = map.GetLayers();
MgLayer layer = (MgLayer)layers.GetItem("property layer");
MgResourceIdentifier resId = new
MgResourceIdentifier(layer.GetFeatureSourceId());
MgResourceIdentifier layerDefResId = layer.GetLayerDefinition();
MgByteReader byteReader =
resourceService.GetResourceContent(layerDefResId);
// Load the Layer Definition and Navigate to the specified
<VectorScaleRange>
XmlDocument doc = new XmlDocument();
String xmlLayerDef = byteReader.ToString();
doc.LoadXml(xmlLayerDef);
XmlNodeList nodeList =
doc.GetElementsByTagName("VectorScaleRange");
XmlElement vectorScaleRangecElement = (XmlElement)nodeList.Item(0);
XmlElement areaTypeStyle =
(XmlElement)vectorScaleRangecElement.GetElementsByTagName("AreaTypeStyle").Item(0);
// Remove any existing <AreaRule> elements.
XmlNodeList areaRuleList =
areaTypeStyle.GetElementsByTagName("AreaRule");
int count = areaRuleList.Count;
for (int i = 0; i < count; i++)
{
//The areaRuleList shrinks as we remove items, so always
//remove the first item (don't use the index i)
areaTypeStyle.RemoveChild(areaRuleList.Item(0));
}
// Now create the new <AreaRule> elements.
String areaRuleTemplate =
File.ReadAllText(GetThemeXmlTemplatePath());
MgFeatureAggregateOptions aggregateOptions = new
MgFeatureAggregateOptions();
String value = null;
String filterText = null;
String areaRuleXML = null;
XmlDocument areaDoc = null;
XmlNode areaNode = null;
double portion = 0.0;
aggregateOptions.AddFeatureProperty("FeatId");
aggregateOptions.SelectDistinct(true);
aggregateOptions.SetFilter(totquery);
double increment = (5 > 1) ? 1.0 / (5 - 1) : 1.0;
MgDataReader dataReader = featureService.SelectAggregate(resId,
layer.GetFeatureClassName(), aggregateOptions);
while (dataReader.ReadNext())
{
value = GetFeaturePropertyValue(dataReader, "FeatId");
filterText = """ + "FeatId" + "" = ";
filterText = filterText + value;
areaRuleXML = String.Format(areaRuleTemplate,
"FeatId" + ":" + value,
filterText,
InterpolateColor(portion, "C2C3C4", "C2C3C4", 0), InterpolateColor(portion,
"C2C3C4", "C2C3C4", 0));
areaDoc = new XmlDocument();
areaDoc.LoadXml(areaRuleXML);
areaDoc.Save("C:\\theme.xml");
areaNode = doc.ImportNode(areaDoc.DocumentElement, true);
areaTypeStyle.AppendChild(areaNode);
portion = portion + increment;
}
dataReader.Close();
// Now save our new layer definition to the session and add it to
the map.
String xmlString = doc.DocumentElement.OuterXml;
String uniqueName = this.MakeUniqueLayerName(map, "property layer",
"sample");
String legendLabel = layer.GetLegendLabel();
if ("sample".Length > 0)
legendLabel = legendLabel + " (" + "sample" + ")";
MgResourceIdentifier layerResId = new
MgResourceIdentifier("Session:" + sessionId + "//" + uniqueName +
".LayerDefinition");
resourceService.SetResource(layerResId, new MgByteReader(xmlString,
"text/xml") , null);
MgLayer newLayer = new MgLayer(layerResId, resourceService);
newLayer.SetName(uniqueName);
newLayer.SetLegendLabel(legendLabel);
newLayer.SetDisplayInLegend(layer.GetDisplayInLegend());
newLayer.SetVisible(true);
newLayer.SetSelectable(layer.GetSelectable());
layers.Insert(layers.IndexOf(layer), newLayer);
map.Save(resourceService);
return uniqueName;
}
---------------------------------------------
private String InterpolateColor(double portion, String startColor, String
endColor, int percentTransparent)
{
int alpha = (int)(255 * (100.0 - percentTransparent) / 100.0);
String result = "";
if (startColor.Equals(endColor))
{
result = String.Format("{0:X2}{1}", alpha, startColor);
}
else
{
int red = CalculateRGB(portion, startColor.Substring(0, 2),
endColor.Substring(0, 2));
int green = CalculateRGB(portion, startColor.Substring(2, 2),
endColor.Substring(2, 2));
int blue = CalculateRGB(portion, startColor.Substring(4, 2),
endColor.Substring(4, 2));
result = String.Format("{0:X2}{1:X2}{2:X2}{3:X2}", alpha, red,
green, blue);
}
return result;
}
private String MakeUniqueLayerName(MgMap map, String layerName, String
themeName)
{
String desiredName = "_" + layerName + themeName;
String uniqueName = desiredName;
int index = 1;
while (map.GetLayers().Contains(uniqueName))
{
uniqueName = desiredName + index.ToString();
index++;
}
return uniqueName;
}
private int CalculateRGB(double portion, String startRGB, String endRGB)
{
double result = Int32.Parse(startRGB, NumberStyles.HexNumber) +
portion * (Int32.Parse(endRGB, NumberStyles.HexNumber) -
Int32.Parse(startRGB, NumberStyles.HexNumber));
return (int)result;
}
String GetThemeXmlTemplatePath()
{
String xmlTemplatePath ="D:\\arearuletemplate.xml";
return xmlTemplatePath;
}
---------------------------------------
can u plz tell me the solution?
Regards,
Padmini.
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