GetFullExtent zooming out, but Dynamic Layers are blank

KevinSesock · ‎02-18-2011

We're not sure if this has to do with our service, or with our silverlight viewer, but we have an issue with when zooming out to the full extent of our map, set by the ConstrainFullExtent property, we have an issue where our dynamic layers disappear. This seems to be similar to this issue, here:

http://forums.arcgis.com/threads/18071-Graphic-objects-disappearing-when-zoom-in-out?highlight=Layer...

As in one of our other maps (currently on API 2.0), we have the issue where when full zoomed out, zooming in requires several mouse clicks that don't seem to zoom you in very fast.

Both maps seem to have an issue where our Dynamic layer "disappears" at full extent. This is most easily replicated by Map.ZoomTo(Map.Layers.GetFullExtent()); (in our Legacy Toolbar, the Full Extent button).

Our map experiencing this issue, is here:

http://www.owrb.ok.gov/learn/GWQ-sl/

You may have to adjust your browser size, as it doesn't do this at all browser sizes.

JenniferNery · ‎02-18-2011

Please go through this blog post for troubleshooting blank layers http://blogs.esri.com/Dev/blogs/silverlightwpf/archive/2009/08/24/Troubleshooting-blank-layers.aspx. Fiddler might be able to tell us whether a web request for that layer was sent or not and if any failure had occurred.

KevinSesock · ‎02-18-2011

No dice on any of these. Let me be clear, I can see all of my layers, except when zoomed to full extent.

DanielWalton · ‎02-21-2011

Weird problem. Are you ignoring any exceptions anywhere in your app? E.g.

try 
{
//code
}
catch
{
//empty catch block
}

Also, it might be related to the way your map control extent and layer extents are set up. Couldn't say much more without seeing some code.

DominiqueBroux · ‎02-21-2011

Hi Kevin,

I tried to reproduce your issue, but I don't understand what type of constrainextentbehavior you set up.

It looks like we are not able to zoom out after reaching the full extent (normal), but we are able to pan outside this extent(and then even zoom out to a large extent). This looks strange to me.

Could you help me on this point?

Thanks

KevinSesock · ‎02-22-2011

           <esri:Map x:Name="BaseWIMS" IsLogoVisible="False" ExtentChanged="BaseWIMS_ExtentChanged" Extent="-98.220507, 36.188768, -96.225105, 34.716448" MouseClick="QueryPoint_MouseClick" >
                <i:Interaction.Behaviors>
                    <esri:MaintainExtentBehavior />
                    <esri:ConstrainExtentBehavior ConstrainedExtent="-98.220507, 36.188768, -96.225105, 34.716448" />
                </i:Interaction.Behaviors>
                <esri:ArcGISTiledMapServiceLayer ID="BaseLayer" Url="http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer" />
                <esri:ArcGISDynamicMapServiceLayer ID="BoundaryLayer" Url="http://rest.owrb.ok.gov/ArcGIS/rest/services/Special_Studies/Garber_GWQ_Max_Metals_Boundary_WGS84/MapServer"  Opacity=".85"/>
                <esri:ArcGISDynamicMapServiceLayer ID="CountyLayer" Url="http://rest.owrb.ok.gov/ArcGIS/rest/services/Base/SDE_State_County_PLSS_WGS84/MapServer" InitializationFailed="CountyLayer_InitializationFailed" Opacity=".9"/>
                <esri:ArcGISDynamicMapServiceLayer ID="DynamicLayer" Url="http://rest.owrb.ok.gov/ArcGIS/rest/services/Special_Studies/Garber_GWQ_Max_Metals_WGS84/MapServer" Initialized="ArcGISDynamicMapServiceLayer_Initialized" InitializationFailed="ArcGISDynamicMapServiceLayer_InitializationFailed" />
                <esri:GraphicsLayer ID="GraphicsLayer" />
            </esri:Map>

For reference, BaseWIMS_ExtentChanged is for the ToolbarWidget. It does have a Try/Catch block but I'm not seeing any exceptions.

I have a UserControl_Loaded method that is wired up to "Loaded" on the root UserControl object in the XAML, and here's what it's doing:

        private void UserControl_Loaded(object sender, RoutedEventArgs e)
        {
            //Show disclaimer at startup, after splash screen.
            lblDisclaimer_Link(sender, e);
            BaseWIMS.MinimumResolution = .0001;
   //Fix for broken ConstrainExtentBehavior in SL4.
            /*System.Windows.Interactivity.Behavior behavior = new ESRI.ArcGIS.Client.Behaviors.ConstrainExtentBehavior()
            {
                ConstrainedExtent = new ESRI.ArcGIS.Client.Geometry.Envelope(-98.220507, 36.188768, -96.225105, 34.716448)
            };
            System.Windows.Interactivity.Interaction.GetBehaviors(BaseWIMS).Add(behavior); */
            BaseWIMS.Cursor = Cursors.Hand;
        }

As you can see, I did have an issue with the 2.0 API that had to do with ConstrainExtentBehavior (from what I recall this was a known issue), but this seems to be working in 2.1, so I've commented the code.

Other than that, I'm not sure what would be causing this issue.

DominiqueBroux · ‎02-22-2011

Hi Kevin,

Yours YMin and Ymax are reversed:

<esri:ConstrainExtentBehavior ConstrainedExtent="-98.220507, 36.188768, -96.225105, 34.716448" />

That being said, I am not sure this will solve your issue (I was not able to reproduce it), but at least this will prevent to pan outside the constraint extent.
So I think it's worth the try after fixing the order.

If you still get the issue, could you test without the 'MaintainExtentBehavior'?

KevinSesock · ‎02-22-2011

Reversing the YMin and YMax actually made it worse (it was doing the same thing further out and zooming in was very... clunky, for lack of a better word).

Taking out the ConstrainExtentBehavior however, definitely resolved the issue. The dynamic layers are displaying at all resolutions now. However, I can't have my full extent be the maximum extent of the base map layer (in other words, the entire world).

Would you like me to upload with the reversed YMin and YMax so you can see the effects?

DominiqueBroux · ‎02-22-2011

Would you like me to upload with the reversed YMin and YMax so you can see the effects?

Yes, please, this might help me to have a clue.

Did you test without the MaintainExtentBehavior as well?

And could you test without the BaseWIMS_ExtentChanged as well?

Thanks

KevinSesock · ‎02-22-2011

New version uploaded to http://www.owrb.ok.gov/learn/GWQ-sl/

This has no MaintainExtentBehavior (taking it out didn't seem to change anything), and I put ConstrainExtentBehavior back into the XAML and took it out of the UserControl_Loaded method in the code-behind.

This is what I have at the moment:

            <esri:Map x:Name="BaseWIMS" IsLogoVisible="False" ExtentChanged="BaseWIMS_ExtentChanged" Extent="-98.220507, 34.716448, -96.225105, 36.188768" MouseClick="QueryPoint_MouseClick" >
                <i:Interaction.Behaviors>
                    <!-- <esri:MaintainExtentBehavior />-->
                    <esri:ConstrainExtentBehavior ConstrainedExtent="-98.220507, 34.716448, -96.225105, 36.188768" />
                </i:Interaction.Behaviors>
                <esri:ArcGISTiledMapServiceLayer ID="BaseLayer" Url="http://server.arcgisonline.com/ArcGIS/rest/services/ESRI_StreetMap_World_2D/MapServer" />
                <esri:ArcGISDynamicMapServiceLayer ID="BoundaryLayer" Url="http://rest.owrb.ok.gov/ArcGIS/rest/services/Special_Studies/Garber_GWQ_Max_Metals_Boundary_WGS84/MapServer"  Opacity=".85"/>
                <esri:ArcGISDynamicMapServiceLayer ID="CountyLayer" Url="http://rest.owrb.ok.gov/ArcGIS/rest/services/Base/SDE_State_County_PLSS_WGS84/MapServer" InitializationFailed="CountyLayer_InitializationFailed" Opacity=".9"/>
                <esri:ArcGISDynamicMapServiceLayer ID="DynamicLayer" Url="http://rest.owrb.ok.gov/ArcGIS/rest/services/Special_Studies/Garber_GWQ_Max_Metals_WGS84/MapServer" Initialized="ArcGISDynamicMapServiceLayer_Initialized" InitializationFailed="ArcGISDynamicMapServiceLayer_InitializationFailed" />
                <esri:GraphicsLayer ID="GraphicsLayer" />
            </esri:Map>