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How many Marker Overlays allowed?

#1

 I am trying to create multiple Marker Overlays with different characteristics (some represent doctors, some represent hospitals).  My code looks like this:


InMemoryMarkerOverlay doclayer = DefineMarkerLayer(mDoctorLayer, Images); //Builds Layer


InMemoryMarkerOverlay hosplayer = DefineMarkerLayer(mHospitalLayer, Images);  //Builds Layer


MapControl.Overlays.Add("DoctorOverlay", doclayer);


MapControl.Overlays.Add("HospitalOverlay", hosplayer);


How can I have both layers display?  Only the Hospital layer displays, when I comment out the Hospital Layer the Doctor Layer displays.


Thanks!!


bob


 


 


 



#2

Hi Bob,


There must be something wrong in the DefineMarkerLayer method, I can get two markerOverlay displayed with the following code:



        private void Form_Load(object sender, EventArgs e)
        {
            winformsMap1.MapUnit = GeographyUnit.DecimalDegree;
            winformsMap1.CurrentExtent = new RectangleShape(-155.733, 95.60, 104.42, -81.9);
            AddMarkerOverlay(new Feature(0 ,0));
            AddMarkerOverlay(new Feature(-95.2806, 38.9554));
            winformsMap1.Refresh();
        }

        private void AddMarkerOverlay(Feature newFeature)
        {
            InMemoryMarkerOverlay markerOverlay = new InMemoryMarkerOverlay();
            markerOverlay.MapControl = winformsMap1;
            markerOverlay.Columns.Add(new FeatureSourceColumn("Name"));
            markerOverlay.ZoomLevelSet.ZoomLevel01.DefaultPointMarkerStyle.Image = Properties.Resources.AQUA;
            markerOverlay.ZoomLevelSet.ZoomLevel01.DefaultPointMarkerStyle.Width = 20;
            markerOverlay.ZoomLevelSet.ZoomLevel01.DefaultPointMarkerStyle.Height = 34;
            markerOverlay.ZoomLevelSet.ZoomLevel01.DefaultPointMarkerStyle.YOffset = -17;
            markerOverlay.ZoomLevelSet.ZoomLevel01.DefaultPointMarkerStyle.ToolTipText = "This is [#Name#].";
            markerOverlay.ZoomLevelSet.ZoomLevel01.ApplyUntilZoomLevel = ApplyUntilZoomLevel.Level20;
            winformsMap1.Overlays.Add(markerOverlay);

            newFeature.ColumnValues.Add("Name", "Lawrence");

            markerOverlay.FeatureSource.BeginTransaction();
            markerOverlay.FeatureSource.AddFeature(newFeature);
            markerOverlay.FeatureSource.CommitTransaction();
        }


Hope it helps,


Edgar



#3

Hi Edgar


The sample code does not work for me. It always show the marker on the overlay added the last. Please advise


Thanks


Yi



#4

Hi Yi,


We answered you in the other post, please check it: gis.thinkgeo.com/Support/Dis...fault.aspx


Thanks,


Edgar