[mapguide-users] set and zoom to selection

[Scott Hameister]

Is it Empty empty or an empty Schema.big difference in trying to help.

I also noticed you didn't do a Selection.Open.So you've instantiated the
object.but haven't opened it.I've had weird issues between intitializing,
save and Open that confuse me.It seems if I initialize the object, do a
save, and then Open I get a blank set.if I do an Open Only I get the current
selection.

 

 

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From: mapguide-users-bounces at lists.osgeo.org
[mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Knight, Gregory
Sent: Thursday, February 01, 2007 4:02 PM
To: MapGuide Users Mail List
Subject: RE: [mapguide-users] set and zoom to selection

 

Me again.  Im trying to work through some of the PHP examples and convert
them to C#...  I not doing a very good job.  but Im making some progress.

 

I have a feature source - to which Ive applied a basic filter.  I am able to
read feature geometry and attributes from my featureReader.  now id like to
convert that filtered feature to a selection. I think there is a problem
with the last four lines in the code below.  because, if I write the
selectionXml variable to the task pane, it is empty.

 

Any idea what Im doing wrong here?

 

            // create a filter to select the specified parcel

             

            String filter = "PID_LONG LIKE '%" + parcelID + "%'";

            MgResourceIdentifier featureResId = new
MgResourceIdentifier("Library://BRA/Data/Bos_Parcels_06.FeatureSource");

            MgFeatureQueryOptions queryOptions = new
MgFeatureQueryOptions();

            queryOptions.SetFilter(filter);

            

            // get the parcel feature from the feature source

            

            MgAgfReaderWriter geometryReaderWriter = new
MgAgfReaderWriter();

            MgFeatureReader featureReader =
featureService.SelectFeatures(featureResId, "Bos_Parcels_06", queryOptions);

            featureReader.ReadNext();

 

            // get the parcel geometry

 

            MgByteReader byteReader = featureReader.GetGeometry("Geometry");

            MgGeometry geometry = geometryReaderWriter.Read(byteReader);

            MgPoint point = geometry.GetCentroid();

            double x = point.GetCoordinate().GetX();

            double y = point.GetCoordinate().GetY();

                                    

            // create a selection, save the selection as XML

 

            MgLayerBase layer = map.GetLayers().GetItem("Bos_Parcels_06");

            MgSelection selection = new MgSelection(map);

            selection.AddFeatures(layer, featureReader, 0);

            String selectionXml = selection.ToXml();

 

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From: mapguide-users-bounces at lists.osgeo.org
[mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Knight, Gregory
Sent: Thursday, February 01, 2007 12:07 PM
To: MapGuide Users Mail List
Subject: [mapguide-users] set and zoom to selection

 

I have an application that allows a user to get parcel info for a given
parcel id.  The application flow is much like many of the available
developer samples:

 

-          Get parcel id from user

-          Return link to parcel 

-          User clicks on link to zoom to parcel

-          User can then select parcel to display parcel attributes

 

This works, but I think there is much more user interaction here than
necessary.  Once I have the parcel id from the user (and I know its valid),
Id like to automatically zoom to that parcel and display the relevant parcel
data in the task pane.  Im a little stumped on how I might do this, as the
examples that illustrate setting active selection, zooming to active
selection, etc - all rely on using page load events / javascript, XML
selection sets, etc - again, all more user interaction than I'd like.  

 

I'm assuming I can do this with one page (as opposed to 2 or 3) via the web
api - but I cant find any examples.  Can someone point me in the right
direction here?

 

Many thanks,

 

Greg


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