Zoom to select Query results

DavidAshton — Thu, 16 Dec 2010 21:45:48 GMT

I have a simple query, which is working great...populates my tablegrid but I'm having trouble with the zoom to selected feature functionality. Can someone help?


        #region Attribute Query

        private void ExcuteAPNQuery_Click(object sender, RoutedEventArgs e)
       
        {
            GraphicsLayer selectionGraphicslayer = Map.Layers["MySelectionGraphicsLayer"] as GraphicsLayer;
            selectionGraphicslayer.ClearGraphics();

            QueryTask queryTask = new QueryTask("http://dgpdch01/ArcGIS/rest/services/Parcels/MapServer/0");
            queryTask.ExecuteCompleted += AQueryTask_ExecuteCompleted;
            queryTask.Failed += AQueryTask_Failed;

            Query query = new ESRI.ArcGIS.Client.Tasks.Query();

            query.Where = string.Format("APN = '{0}'", FindAPN.Text);

            query.OutFields.Add("*");
           
            query.Text = FindAPN.Text;

            _queryTask.ExecuteAsync(query);
        }


        private void AQueryTask_ExecuteCompleted(object sender, ESRI.ArcGIS.Client.Tasks.QueryEventArgs args)
        {
          //  FeatureSet featureSet = args.FeatureSet;

         //   GraphicsLayer graphicsLayer = Map.Layers["MySelectionGraphicsLayer"] as GraphicsLayer;

         //   if (MySelectionGraphicsLayer = null && MySelectionGraphicsLayer.Features.Count > 0)
       //     {

               // Graphic feature = featureSet.Features[0];
               // foreach (Graphic feature in featureSet.Features)
                {
                //    feature.Symbol = LayoutRoot.Resources["ResultsFillSymbol"] as FillSymbol;
                //    graphicsLayer.Graphics.Insert(0, feature);

                    // Zoom to selected feature (define expand percentage)

                    ESRI.ArcGIS.Client.Geometry.Envelope selectedFeatureExtent = Feature.Geometry.Extent;

                    double expandPercentage = 30;

                    double widthExpand = selectedFeatureExtent.Width * (expandPercentage / 100);
                    double heightExpand = selectedFeatureExtent.Height * (expandPercentage / 100);

                    ESRI.ArcGIS.Client.Geometry.Envelope displayExtent = new ESRI.ArcGIS.Client.Geometry.Envelope(
                    selectedFeatureExtent.XMin - (widthExpand / 2),
                    selectedFeatureExtent.YMin - (heightExpand / 2),
                    selectedFeatureExtent.XMax + (widthExpand / 2),
                    selectedFeatureExtent.YMax + (heightExpand / 2));

                    Map.ZoomTo(displayExtent);

         //       }

                ResultsDisplay.Visibility = Visibility.Visible;
            }
            _drawSurface.IsEnabled = false;

        }

      
        private void AQueryTask_Failed(object sender, TaskFailedEventArgs args)
        {
            MessageBox.Show("Query failed: " + args.Error);
        }

Re: Zoom to select Query results

DominiqueBroux — Sun, 12 Dec 2021 06:36:40 GMT

but I'm having trouble with the zoom to selected feature functionality.

What kind of trouble?

In your code, where is coming the 'Feature' from?

 
ESRI.ArcGIS.Client.Geometry.Envelope selectedFeatureExtent = Feature.Geometry.Extent;

As a side note, in 2.1 an 'Expand' method has been added to Envelope class.

Re: Zoom to select Query results

DavidAshton — Mon, 20 Dec 2010 15:59:55 GMT

dbroux,

Thanks for the reply. I got it.

Dave

topic Zoom to select Query results in ArcGIS API for Silverlight Questions

Zoom to select Query results

Re: Zoom to select Query results

Re: Zoom to select Query results