topic Re: Flex Viewer 2.1 - Increase maximum zoom? in ArcGIS API for Flex Questions

Flex Viewer 2.1 - Increase maximum zoom?

JackReed — Fri, 24 Sep 2010 13:44:59 GMT

Hi,
I am using the already compiled flex viewer 2.1 and have dynamic operational layers on top of the default basemaps. What I would like to do is to be able to zoom in closer than the default maximum zoom. Is this possible? I cannot find any documentation anywhere relating to this.

Thanks,
Jack

Re: Flex Viewer 2.1 - Increase maximum zoom?

ErwanCaradec — Sat, 11 Dec 2021 11:45:47 GMT

In previous version (1.3) it was possible to add lods (Levels Of Details) in MapManager.mxml, adding lines in map.lods array (one for each extra LOD) in mapLoadComplete function :

var lods:Array = map.lods;
lods.push( new LOD( NaN, 0.6, 3000) );
lods.push( new LOD( NaN, 0.3, 1500) );
lods.push( new LOD( NaN, 0.1, 500) );

But in 2.1 version, this modification doesn't work fine, when i zoom to one of this "extra" LOD i've got this flash error from Flex Api :

TypeError: Error #1010: Un terme n'est pas défini et n'a pas de propriété.
 at com.esri.ags.layers::TiledMapServiceLayer/loadTiles()

I need help too.
Thanks

Erwan

Re: Flex Viewer 2.1 - Increase maximum zoom?

MarcWeinshenker1 — Fri, 24 Sep 2010 15:30:53 GMT

In MapManager.mxml I did the following:

Add this line among the imports at the top of the module:
import com.esri.ags.layers.supportClasses.LOD;

In the private function addLayerToMap inside the case "tiled", after map.addLayer(tiledLayer); add the line:
map.addEventListener(MapEvent.LOAD, addLODs);

Finally, at the bottom of the module, add this function (using LODs per your needs; my code adds two zoom-in steps beyond the default):

   private function addLODs (event:MapEvent):void
   {
    var lods:Array = map.lods;
    lods.push( new LOD( 18, 0.597164283559817, 2256.994353 ) );
    lods.push( new LOD( 19, 0.298582141647617, 1128.497176 ) );
    map.lods = lods;
   }

Hope this helps. Sorry for not using code insertions but I'm not a frequent enough poster on these new boards to have figured it out yet.

Marc

Re: Flex Viewer 2.1 - Increase maximum zoom?

ErwanCaradec — Sat, 11 Dec 2021 11:45:50 GMT

Thanks Mark,
you're right in 2.1 version, level value is needed, in 1.3 it was not, NaN value was correct.

In my implementation, with multi-config i need to add extra lod configuring config.xml like this :

<extralods>
 <extralod level="18" resolution="0.597164283559817" scale="2256.994353" />
 <extralod level="19" resolution="0.298582141647617" scale="1128.497176" />
</extralods>

If you need too, have a look at the modifications quoted "24/09/2010 #1" in attached files :
config.xml
ConfigData.as
ConfigManager.as
MamManager.mxml

Hope that helps.
Erwan

Re: Flex Viewer 2.1 - Increase maximum zoom?

JackReed — Fri, 24 Sep 2010 19:15:14 GMT

Thanks for the feedback. I am very new to Flex, and have been using the stock viewer with just some minor modifications. If I understand correctly I need to make these changes in Adobe Flash Builder, then compile?

Thanks for your patience.

Jack

Re: Flex Viewer 2.1 - Increase maximum zoom?

ErwanCaradec — Sat, 25 Sep 2010 05:38:33 GMT

Yes Jack,
just modify the source code as Marc Weinshenker indicate, in FlashBuilder 4, then recompile.

Re: Flex Viewer 2.1 - Increase maximum zoom?

ErwanCaradec — Sat, 11 Dec 2021 11:45:53 GMT

I'd like to increase zoom by adding extra LODs (Levels Of Details) using a widget (code less intrusive).
In debug mode it looks that the my new LODs are correctly added to the map.lods array, but zoom slider control is not refreshed.
Is there a way to load the widget at the correct moment or refresh the map controls after new LODs have been added ?

Thanks.

Erwan

EtxraLodsWidget.xml :

<?xml version="1.0" ?>
<configuration>
 <extralods>
  <extralod level="18" resolution="0.597164283559817" scale="2256.994353" />
  <extralod level="19" resolution="0.298582141647617" scale="1128.497176" />
 </extralods>
</configuration>

ExtraLodsWidget.mxml :

<?xml version="1.0" encoding="utf-8"?>
<!--
     ////////////////////////////////////////////////////////////////////////////////
     //
     // Copyright (c) 2010 ESRI
     //
     // All rights reserved under the copyright laws of the United States.
     // You may freely redistribute and use this software, with or
     // without modification, provided you include the original copyright
     // and use restrictions.  See use restrictions in the file:
     // <install location>/License.txt
     //
     ////////////////////////////////////////////////////////////////////////////////
-->
<viewer:BaseWidget xmlns:fx="http://ns.adobe.com/mxml/2009"
                   xmlns:s="library://ns.adobe.com/flex/spark"
                   xmlns:mx="library://ns.adobe.com/flex/mx"
                   xmlns:viewer="com.esri.viewer.*"
                   widgetConfigLoaded="init()" xmlns:esri="http://www.esri.com/2008/ags">
    <fx:Script>
        <![CDATA[
   import com.esri.ags.events.MapEvent;
   import com.esri.ags.layers.supportClasses.LOD;
            
   private var extraLodsXml:XMLList;
   private var extraLodsArr:Array = [];

            private function init():void
            {
                if (configXML)
                {
     extraLodsXml = configXML..extralod;
     addLODs();
     
     //map.addEventListener(MapEvent.LOAD, addLODs);
     //map.dispatchEvent(new MapEvent(MapEvent.LOAD));
     
                }
            }
   private function addLODs():void
   {
    for (var i:Number = 0; i < extraLodsXml.length(); i++)
    {
     var lLevel:Number = Number(extraLodsXml[0].@level[0]);
     var lResolution:Number = Number(extraLodsXml.@resolution[0]);
     var lScale:Number = Number(extraLodsXml.@scale[0]);
     map.lods.push( new LOD( lLevel, lResolution, lScale) );
    }
   }    
        ]]>
    </fx:Script>
</viewer:BaseWidget>

Re: Flex Viewer 2.1 - Increase maximum zoom?

GeraldLee__GISP — Tue, 19 Oct 2010 13:02:00 GMT

Cool, I need this too, but what if you dont have FlashBuilder?

Re: Flex Viewer 2.1 - Increase maximum zoom?

PaulLang — Tue, 19 Oct 2010 18:17:53 GMT

I have this working.
But let�??s say I would like to remove the existing and just use the ones I define.

Where to you go to remove the existing?

Re: Flex Viewer 2.1 - Increase maximum zoom?

ErwanCaradec — Tue, 19 Oct 2010 20:09:34 GMT

Gerald,
here is my beta version of the ExtraLodsWidget for the FlexViewer 2.1, in the zip file you'll find uncompiled and compiled versions.
Now it's working, i've solved the zoom slider problem by sharing data between my ExtraLodsWidget and NavigationWidget.

Have look at the ReadMe file for installation instructions.

Regards.
Erwan Caradec

* paull : Could you post your code please ? You may have a better solution.

Re: Flex Viewer 2.1 - Increase maximum zoom?

PaulLang — Wed, 20 Oct 2010 12:06:11 GMT

I just followed the instructions within src.zip from above.

That worked, so I then removed:
<extralod level="18" resolution="0.597164283559817" scale="2256.994353" />
<extralod level="19" resolution="0.298582141647617" scale="1128.497176" />
Added this:

<extralod level="1" resolution="1.04166666666667" scale="1200"   id="oneZ"   />
<extralod level="2" resolution="2.08333333333333" scale="2400"   id="twoZ"   />
<extralod level="3" resolution="4.16666666666667" scale="4800"   id="threeZ" />
<extralod level="4" resolution="6.25"       scale="7200"   id="fourZ" />
<extralod level="5" resolution="12.5"             scale="14400" id="fiveZ" />
<extralod level="6" resolution="25"               scale="24000" id="sixZ"   />
<extralod level="7" resolution="50"               scale="48000" id="sevenZ" />
<extralod level="8" resolution="100"              scale="96000" id="eightZ" />
<extralod level="9" resolution="200"              scale="192000" id="nineZ" />

Re: Flex Viewer 2.1 - Increase maximum zoom?

ErwanCaradec — Wed, 20 Oct 2010 17:10:03 GMT

Ah ! Okey Paul.
Well, when i posted the src.zip, it was a working solution but not very clean because some core distribution files of the FlewViewer were modified (ConfigData.as, ConfigManager.as and MapManager.mxml). In the code you posted, the two lines you removed are an example, it depend on wich scales level you want to increase zooming. In the lines added id field is not necessary.

In the ExtraLodsWidget, only one widget file is modified (NavigationWidget.mxml), none of the file in the com.esri.viewer directory, so i think it is a better way to increase zooming over your tiled layers if you need it.

Regards,
Erwan

Re: Flex Viewer 2.1 - Increase maximum zoom?

PaulLang — Wed, 20 Oct 2010 17:58:23 GMT

Ok, I will give the widget a try.
Do you know how to remove the other lods so I can just use those I put in the config file?

Re: Flex Viewer 2.1 - Increase maximum zoom?

ErwanCaradec — Wed, 20 Oct 2010 21:05:47 GMT

The widget can only push lods in map.lods array, it can't remove others. I'm not sure to understand your needs, because if you remove lods added by the tiled layers this layers won't work (they are constitued from cached images of the raster at spécified scales). Maybe should you use dynamic's layer only ?