In uDig we try and put users in control; so we ask that you add your 
FeatureColection to the catalog as a temporary entry; this allows users to save 
the content out to a shapefile or something if they want to do so. 

The documentation on creating a temporary resource is here:
- http://udig.refractions.net/confluence/display/DEV/2+Catalog

ICatalog:
createTemporaryResource( Object ) - used to create a temporary resources, 
usually by using a FeatureType
getTemporaryDescriptorClasses() - list of classes for which a temporary 
resource can be created


You will often find that people create their own map graphic if they want to 
provide feedback visually (this is the other reason developers sometimes ask 
how to draw a feature collection).
-- 
Jody Garnett


On Monday, 7 November 2011 at 8:14 PM, Alberto Debiasi wrote:

> Hi everybody,
> using Geotools I can visualize a DefaultFeatureCollection in this way:
> 
>  DefaultFeatureCollection deffc = new DefaultFeatureCollection(collection);
>         
>      map.addLayer(deffc, null);   
>     JMapFrame.showMap(map);
> 
> But how can I create a Udig layer starting from a DefaultFeatureCollection 
> (and then visualize the data on a IMap) ?
> 
> Thanks.
> Alberto
> 
> 
> _______________________________________________
> User-friendly Desktop Internet GIS (uDig)
> http://udig.refractions.net
> http://lists.refractions.net/mailman/listinfo/udig-devel
> 
> 


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