topic Re: creating a graphic layer from another feature layer in ArcGIS API for Flex Questions

creating a graphic layer from another feature layer

abukhan — Mon, 10 Jan 2011 15:24:47 GMT

I have a feature layer and it shows polygons.

i want to create another graphic layer from the above ..
I tried to use graphiclayer.graphicprovider = featurelayer.graphicprovider , but it did not work..
I tried creating a deep copy of the arraycollection of the featurelayer and then use that as the graphiclayer graphicprovider but that did not work

Is there any way of creating this?

Thanks

Re: creating a graphic layer from another feature layer

RobertScheitlin__GISP — Sun, 12 Dec 2021 05:14:56 GMT

Abu,

This code worked for me:

<?xml version="1.0" encoding="utf-8"?>
<s:Application 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:esri="http://www.esri.com/2008/ags"
      minWidth="955" minHeight="600">
 <fx:Script>
  <![CDATA[
   import com.esri.ags.events.LayerEvent;
   import com.esri.ags.layers.GraphicsLayer;
   
   import mx.collections.ArrayCollection;
   import mx.controls.Alert;

   // the following four functions are 'just' error handling and showing/hiding the busy cursor
   protected function fLayer_updateStartHandler(event:LayerEvent):void
   {
    this.cursorManager.setBusyCursor();
   }
   
   protected function fLayer_updateEndHandler(event:LayerEvent):void
   {
    var ac:ArrayCollection = fLayer.graphicProvider as ArrayCollection;
    var gl:GraphicsLayer = new GraphicsLayer();
    gl.graphicProvider = ac;
    myMap.addLayer(gl);
    fLayer.visible = false;
    this.cursorManager.removeBusyCursor();
   }
  ]]>
 </fx:Script>
 <esri:Map id="myMap">
  <esri:extent>
   <esri:Extent xmin="-14305000" ymin="2748000" xmax="-6815000" ymax="7117000">
    <esri:SpatialReference wkid="102100"/>
   </esri:Extent>
  </esri:extent>
  <esri:ArcGISTiledMapServiceLayer url="http://server.arcgisonline.com/ArcGIS/rest/services/World_Physical_Map/MapServer"/>
  <esri:FeatureLayer id="fLayer"
         mode="snapshot"
         updateEnd="fLayer_updateEndHandler(event)"
         updateStart="fLayer_updateStartHandler(event)"
         url="http://sampleserver3.arcgisonline.com/ArcGIS/rest/services/Petroleum/KSFields/FeatureServer/0"/>
 </esri:Map>
</s:Application>

Re: creating a graphic layer from another feature layer

abukhan — Mon, 10 Jan 2011 18:51:55 GMT

Thanks robert..yes it works..

Abu

Re: creating a graphic layer from another feature layer

abukhan — Mon, 10 Jan 2011 19:02:28 GMT

However it looks like the feature layer does not show (even though you make fLayer visible and gl not visible)

Re: creating a graphic layer from another feature layer

DasaPaddock — Mon, 10 Jan 2011 19:06:10 GMT

A Graphic is a Flash DisplayObject so it can only exist in one container at a time. You'll need to create separate instances if you want them to exist in both layers.

Re: creating a graphic layer from another feature layer

abukhan — Mon, 10 Jan 2011 19:06:12 GMT

what i wanted was:
create graphic layer from the feature layer and render it differently than the feature layer..I donot want to loose the feature layer and it will be rendered different than the graphic layer..

Re: creating a graphic layer from another feature layer

abukhan — Mon, 10 Jan 2011 19:11:01 GMT

Desa:

any example of the above scenerio will be appreciated

Re: creating a graphic layer from another feature layer

DasaPaddock — Mon, 10 Jan 2011 19:14:12 GMT

You could create two FeatureLayers where you've set your own renderer or symbol on the 2nd one. This will put more load on the network and the server though so you could duplicate the Graphics and put the copy in the GraphicsLayer.

e.g. create a shallow clone that has a reference to the same geometry and attributes:

var newG:Graphic = new Graphic(oldG.geometry, null, oldG.attributes);
graphicsLayer.add(newG);

Re: creating a graphic layer from another feature layer

abukhan — Mon, 10 Jan 2011 20:19:53 GMT

Dasa:

Thanks a lot.. it was very useful.

Abu