[mapguide-users] Layer Zooming

[padmini godavarthi]

Hi Kenneth,
Thank u very much foor ur quick response.

i have seen ur code in php

in this code after gettikg maxx,maxy,minx,miny waht i have to
do????????????///
i think i dont have necessity to create mapdefinition,web layout  all these
thinkgs right???????????
my code is as
follows...............................................................




        Dim serverVars As NameValueCollection = Request.ServerVariables
        Dim strServerVars As String = ""

        Dim str1 As String
        For Each str1 In serverVars.AllKeys
            strServerVars += "<br>" & str1
        Next
        Dim platform As String = serverVars("SERVER_SOFTWARE")
        Dim queryStr As String = serverVars("QUERY_STRING")
        Dim queryStr1 As String = serverVars("Form")
        Dim requestParams As NameValueCollection = IIf(Request.HttpMethod =
"POST", Request.Form, Request.QueryString)

        Dim sessionId As String = Request.QueryString("SESSION")
        Dim realPath As String =
Request.ServerVariables("APPL_PHYSICAL_PATH")
        Dim configPath As String = realPath + "webconfig.ini"
        MapGuideApi.MgInitializeWebTier(configPath)
        Dim userInfo As MgUserInformation = New MgUserInformation(sessionId)
        Dim siteConnection As MgSiteConnection = New MgSiteConnection
        siteConnection.Open(userInfo)
        Dim resService As MgResourceService =
siteConnection.CreateService(MgServiceType.ResourceService)
        Dim featureService As MgFeatureService =
siteConnection.CreateService(MgServiceType.FeatureService)
        Dim shortclass As New MgClassDefinition()

        Dim map As MgMap = New MgMap()
        map.Open(resService, "mapdata")
        Dim value As String = ""
        Dim filterText As String = ""
        Dim areaRuleXML As String = ""
        Dim areaDoc As XmlDocument = Nothing
        Dim areaNode As XmlNode = Nothing
        Dim portion As Double = 0.0
        Dim layers As MgLayerCollection = map.GetLayers()
        Dim layer As MgLayer = CType(layers.GetItem("IMC_ROAD_LINK"),
MgLayer)
        Dim resId As MgResourceIdentifier = New
MgResourceIdentifier(layer.GetFeatureSourceId())
        Dim layerDefResId As MgResourceIdentifier =
layer.GetLayerDefinition()
        Dim byteReader As MgByteReader =
resService.GetResourceContent(layerDefResId)
        Dim doc As New XmlDocument()
        Dim xmlLayerDef As String = byteReader.ToString()
        doc.LoadXml(xmlLayerDef)

        Dim nodeList As XmlNodeList =
doc.GetElementsByTagName("VectorScaleRange")

        Dim vectorScaleRangecElement As XmlElement = CType(nodeList.Item(0),
XmlElement)
        Dim areaTypeStyle As XmlElement =
CType(vectorScaleRangecElement.GetElementsByTagName("LineTypeStyle").Item(0),
XmlElement)


        Dim areaRuleList As XmlNodeList =
areaTypeStyle.GetElementsByTagName("LineRule")
        Dim count As Integer = areaRuleList.Count
        For iq As Integer = 0 To count - 1
            areaTypeStyle.RemoveChild(areaRuleList.Item(0))
        Next
        Dim areaRuleTemplate As String =
File.ReadAllText(GetThemeXmlTemplatePath())
        Dim queryoptions As MgFeatureQueryOptions = New
MgFeatureQueryOptions()
        queryoptions.AddFeatureProperty("LINK_ID")
        'queryoptions.SetFilter("LINK_ID IN (147)")
        Dim query3 As String

        ' queryoptions.SetFilter("LINK_ID=147 or  LINK_ID=148 or LINK_ID=149
or LINK_ID=150")
        Dim arr() As String = Strings.Split(strq(0), ",")
        Dim aw As Integer = arr.Length
        For a As Integer = 0 To aw - 1
            If a = 0 Then
                query3 = "LINK_ID=" & arr(0)
            Else
                query3 = query3 & " or LINK_ID=" & arr(a)
            End If

        Next
        queryoptions.SetFilter(query3)
        Dim increment1 As Double = IIf((5 > 1), 1.0 / (5 - 1), 1.0)
        Dim str As String = layer.GetFeatureClassName()

        Dim dataReader1 As MgFeatureReader =
featureService.SelectFeatures(resId, layer.GetFeatureClassName(),
queryoptions)
        While dataReader1.ReadNext()
            value = GetFeaturePropertyValue(dataReader1, "LINK_ID")
            filterText = "&quot;" + "LINK_ID" + "&quot; = "
            filterText = filterText + value
            areaRuleXML = String.Format(areaRuleTemplate, "LINK_ID" + ":" +
value, filterText, InterpolateColor(portion, "00FF00", "00FF00", 0),
InterpolateColor(portion, "00FF00", "00FF00", 0))
            areaDoc = New XmlDocument()
            areaDoc.LoadXml(areaRuleXML)
            areaNode = doc.ImportNode(areaDoc.DocumentElement, True)
            areaTypeStyle.AppendChild(areaNode)
            portion = portion + increment1
        End While
        dataReader1.Close()
        Dim xmlString As String = doc.DocumentElement.OuterXml

        Dim layerResId As MgResourceIdentifier = New
MgResourceIdentifier("Session:" + sessionId + "//" + "short path" +
".LayerDefinition")
        resService.SetResource(layerResId, New MgByteReader(xmlString,
"text/xml"), Nothing)

        Dim newLayer As MgLayer = New MgLayer(layerResId, resService)
        Dim legendLabel As String = "Shortest Path"

        newLayer.SetName("Shortest Path")
        newLayer.SetLegendLabel(legendLabel)
        newLayer.SetDisplayInLegend(layer.GetDisplayInLegend())
        newLayer.SetVisible(True)
        newLayer.SetSelectable(layer.GetSelectable())
        layers.Insert(layers.IndexOf(layer), newLayer)
        map.Save(resService)
    End Sub


In this case what i have to doo??????????///
plzzz tell me the solution..............................

Regards,
Padmini.

Kenneth Skovhede, GEOGRAF A/S wrote:
> 
> You need to get the extent of the layer, and then zoom to it.
> 
> There are two extents in FDO, the spatial extents, and the combined 
> object extents.
> For some providers, this is the same value, for others only one of the 
> extents work.
> In other words, you have to handle both situations.
> Fortunately, there is a PHP implementation that does just that, and you 
> can see the code here:
> http://trac.osgeo.org/mapguide/browser/trunk/MgDev/Web/src/schemareport/showgeom.php
> 
> Look at line 95 to 161 to see how its done.
> You have to port this to .Net yourself.
> 
> After you get the extent, you can zoom to the extent.
> Another solution is to select all the features in the temp layer (if 
> they are selectable),
> and the execute zoomToSelection.
> 
> Regards, Kenneth Skovhede, GEOGRAF A/S
> 
> 
> 
> padmini godavarthi skrev:
>> Hi Kenneth, 
>> Thanks for ur reply 
>> i achieved to do shortest path through oracle procedure and added to this
>> result as a seperate layer on the map. 
>>
>> But Now i want the functionality of Zoom to layer (i mean to this
>> shortest
>> path layer) 
>>
>> How is it possible???????????????????????? 
>>
>> Plz tell me the solution..... 
>>
>> Regards, 
>> Padmini................ 
>>
>>   
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> mapguide-users at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/mapguide-users
> 
> 

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