[mapguide-users] polygon zoom problem

[padmini godavarthi]

Hi Kenneth,
Thanks for ur response.
some times i got the x,y and scale values correctly then the zoom function
works correctly

  some times i got the error at MgByteReader


     Dim featureReader As MgFeatureReader
=featureService.SelectFeatures(fetresource,layer.GetFeatureClassName(),
nameQuery)              
Dim geometryFactory As MgGeometryFactory = New MgGeometryFactory()               
  While featureReader.ReadNext()



i got the error as "Specified Object was Not Found"  in

                  Dim byteReader As MgByteReader =
featureReader.GetGeometry("GEOMETRY")

can u plz tell me the solution??????????

Regards,
Padmini.





  


Kenneth Skovhede, GEOGRAF A/S wrote:
> 
> Do you get any javascript errors?
> Are your x,y and scale values correct in the javascript?
> 
> Regards, Kenneth Skovhede, GEOGRAF A/S
> 
> 
> 
> padmini godavarthi skrev:
>>
>>  Hi,
>> iam using mapguide opensource 2.0 (with .net 2.0 +IIS 5.1) on win xp 
>>
>> i have a problem with zom toview function??????????????????
>>
>>  Try
>>
>>
>>             If Not Session("id1") Is Nothing Then
>>
>>
>>                 Dim mapCenterX As Double
>>                 Dim mapCenterY As Double
>>
>>                 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 fetresource As MgResourceIdentifier = New
>> MgResourceIdentifier("Library://propertytax/resource.FeatureSource")
>>                 Dim nameQuery As MgFeatureQueryOptions = New
>> MgFeatureQueryOptions()
>>                 Dim val As String = "PARCEL_ID"
>>                 nameQuery.AddFeatureProperty(val)
>>                 Dim queryval As String = Session("id1")
>>                 Dim totquery As String = val & "=" & "'" & queryval & "'"
>>                 nameQuery.SetFilter(totquery)
>>                 Dim tabname As String = "PROPERTY LAYER"
>>                 Dim map As MgMap = New MgMap()
>>                 map.Open(resService, "oramap")
>>                 Dim layer As MgLayer = map.GetLayers().GetItem("PROPERTY
>> LAYER")
>>                 Dim geometryReaderWriter As MgAgfReaderWriter = New
>> MgAgfReaderWriter()
>>                 Dim featureReader As MgFeatureReader =
>> featureService.SelectFeatures(fetresource, layer.GetFeatureClassName(),
>> nameQuery)
>>                 Dim geometryFactory As MgGeometryFactory = New
>> MgGeometryFactory()
>>                 While featureReader.ReadNext()
>>                    Dim byteReader As MgByteReader =
>> featureReader.GetGeometry("GEOMETRY")
>>                    Dim geometry As MgGeometry =
>> geometryReaderWriter.Read(byteReader)
>>                    Dim centroid As MgPoint = geometry.GetCentroid()
>>                   mapCenterX = centroid.GetCoordinate().GetX()
>>                    mapCenterY = centroid.GetCoordinate().GetY()
>>          Page.ClientScript.RegisterStartupScript(Page.GetType(), "test",
>> "highlight(" & mapCenterX & "," & mapCenterY & ");", True)
>>                 'End While
>>                 featureReader.Close()
>>                 Dim resService1 As MgResourceService =
>> CType(siteConnection.CreateService(MgServiceType.ResourceService),
>> MgResourceService)
>>                 Dim featureService1 As MgFeatureService =
>> CType(siteConnection.CreateService(MgServiceType.FeatureService),
>> MgFeatureService)
>>                 Dim fetresource1 As MgResourceIdentifier = New
>> MgResourceIdentifier("Library://propertytax/resource.FeatureSource")
>>                 Dim nameQuery1 As MgFeatureQueryOptions = New
>> MgFeatureQueryOptions()
>>                 Dim val1 As String = "PARCEL_ID"
>>                 nameQuery1.AddFeatureProperty(val1)
>>                 Dim queryval1 As String = Session("id1")
>>                 Dim totquery1 As String = val1 + "=" + "'" + queryval1 +
>> "'"
>>                 nameQuery1.SetFilter(totquery1)
>>                 Dim layer1 As MgLayer = map.GetLayers().GetItem("PROPERTY
>> LAYER")
>>                 Dim featureReader1 As MgFeatureReader =
>> featureService1.SelectFeatures(fetresource1,
>> layer1.GetFeatureClassName(),
>> nameQuery1)
>>                 Dim selection As MgSelection = New MgSelection(map)
>>                 selection.AddFeatures(layer1, featureReader1, 0)
>>                 Dim selectXML As String = selection.ToXml()
>>                 selection.Save(resService1, "oramap")
>>                 Page.ClientScript.RegisterStartupScript(Page.GetType(),
>> "test", "select('" & selectXML & "')", True)
>>                 featureReader1.Close()
>>
>>             End If
>>                   
>>          
>>         Catch ex As Exception
>>             'MsgBox(ex.Message)
>>         End Try
>>
>> -----------------------------------------------------------------------
>>
>> and my java script functions are
>>
>>
>> function select(val) {
>>      
>>          var selectionXML = val;
>>           parent.parent.SetSelectionXML(selectionXML); 
>>          //    parent.parent.mapFrame.ZoomToView(x,y,2000,true); 
>>         
>>        parent.parent.refresh;
>>          alert("Selected");
>>          
>>         }
>>         function highlight(x,y) 
>>         {
>>            //  alert("2nd");
>>              
>>            var xval = x;
>>            var yval = y;
>>        
>>           parent.parent.mapFrame.ZoomToView(xval,yval,1000,true); 
>>          
>>         }
>>
>> i wrote all this code in taskpane page loading even
>> but i didnt get the exact zoom level of that parcel it remains same as
>> the
>> initial view
>>
>> can any one plz tell me the solution????????????????????????????
>>
>>
>> Regards,
>> padmini.
>>
>>
>>   
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