[mapguide-users] Thematic Mapping
Zac Spitzer
zac.spitzer at gmail.com
Sat Jan 31 18:29:54 EST 2009
when someone takes times to provide a response, it's respectful to taking
a bit more time to read your original email AGAIN !
your calling
InterpolateColor(portion, "C2C3C4", "C2C3C4", 0),
InterpolateColor(portion,"C2C3C4", "C2C3C4", 0));
which takes two colors to create a range, yet you pass in the same
color twice....
sorry if I sound a bit grumpy, but it appears that Chris spent more
time reading
your email that you did after his reply....
z
On Sat, Jan 31, 2009 at 7:57 PM, padmini godavarthi
<godavarthi.padmini at gmail.com> wrote:
>
> 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.
>>
>>
>>
>>
>>
>> --
>> View this message in context:
>> http://n2.nabble.com/Thematic-Mapping-tp2244230p2244230.html
>> Sent from the MapGuide Users mailing list archive at Nabble.com.
>>
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>>
>
> --
> View this message in context: http://n2.nabble.com/Thematic-Mapping-tp2244230p2249312.html
> Sent from the MapGuide Users mailing list archive at Nabble.com.
>
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--
Zac Spitzer -
http://zacster.blogspot.com
+61 405 847 168
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