[mapguide-users] Zoom to feature using ajaxviewer

[veer-singh]

Hello Lists..

Please help me out in this.

I am trying to zoom to a feature based on feature attribute value query.. I
am not selecting any feature on map. i just want to zoomto feature based on
my hardcoded query, here in below function you can assume fixed hardcoded
values for layername and selection which is actually a featid of feature.

i am using following function at server side...

 public String OutputSelectionInHTML(MgMap map, MgFeatureService
featureService, string layerName, string selection, MgResourceService
resService, string mgMapName)
    {
        MgSelection mapSelection = new MgSelection(map);
        mapSelection.Open(resService, mgMapName);
        //MgReadOnlyLayerCollection layers = mapSelection.GetLayers();
        MgLayerCollection layers = map.GetLayers();
        String outString = null;
        MgFeatureReader featReader = null;
        if (layers != null)
        {
            for (int i = 0; i < layers.GetCount(); i++)
            {
                MgLayerBase nextLayer = layers.GetItem(i);
                //MgLayer layer = (MgLayer)layers.GetItem(i);
                if (nextLayer != null && (nextLayer.GetName() == layerName))
                {
                    String layerClassName = nextLayer.GetFeatureClassName();
                    String selectString = "FeatId = " + selection;
                    String layerFeatureIdString =
nextLayer.GetFeatureSourceId();
                    MgResourceIdentifier layerResId = new
MgResourceIdentifier(layerFeatureIdString);
                    MgFeatureQueryOptions queryOptions = new
MgFeatureQueryOptions();
                    queryOptions.SetFilter(selectString);
                    featReader = featureService.SelectFeatures(layerResId,
layerClassName.Split(':')[1].ToString(), queryOptions);
                    while (featReader.ReadNext())
                    {
                        //MgByteReader
mgbyte=featReader.GetGeometry(MgPropertyType.Feature);
                        
                        //mapSelection.AddFeatures(nextLayer, featReader,
mapSelection.GetSelectedFeaturesCount(nextLayer,
layerClassName.Split(':')[1].ToString()));
                        mapSelection.AddFeatures(nextLayer, featReader, 0);
                    }
                     //get XML from selection
                    string selectionXML = mapSelection.ToXml();

                    //get center
                    double selectionCenterX =
mapSelection.GetExtents(featureService).GetLowerLeftCoordinate().GetX() +
mapSelection.GetExtents(featureService).GetWidth() / 2;
                    double selectionCenterY =
mapSelection.GetExtents(featureService).GetLowerLeftCoordinate().GetY() +
mapSelection.GetExtents(featureService).GetHeight() / 2;

                    outString = "zoom~" + selectionXML + "~" +
selectionCenterX + "~" + selectionCenterY;
                                   }
            }
        }
        ClientScript.RegisterStartupScript(this.GetType(), "page", "");  
  }

following at client side





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VEER HCLTECH,INDIA
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