[mapguide-users] Thematic Mapping
padmini godavarthi
godavarthi.padmini at gmail.com
Sat Jan 31 03:57:34 EST 2009
Hi,
Thanks for ur reply.but i didn't get u
can u plz tell me briefly so that it will be helpful to me.
Thanks and Regards,
Padmini.
Chris Claydon wrote:
>
> 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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>
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