Re: [udig-devel] Get feature on mousePressed method

[Jesse Eichar <jesse.eichar@xxxxxxxxxxxxxx>]

The ToolContext (obtained using the getContext() method) has methods  
for generating Boundingboxes in the correct project.  Remember that  
when doing a spatial query on a layer the filter must be in the same  
projection as the layer (at least for now).  So take a look at the  
context and the layer object for assistance creating the bounding  
box.  The idea of a bounding box filter for a mouse click the point  
that a pixel covers a lot of ground in the map so you do a BBox query  
to get the features that intersect with that pixel.

Jesse

On 11-Feb-09, at 6:08 PM, Emily Gouge wrote:

> A feature source can take a filter so instead of asking for all  
> features [source.getFeatures()] you can make a filter and only ask  
> for features within that filter [source.getFeatures(myFilter)].
>
> I believe the context associated with your tool should have a  
> getBoundingBox(...) function that should return a bounding box  
> around where the user clicked.  You can then use a FilterFactory  
> class to create a filter.
>
> Have a look at the info tool; it sounds like you are doing something  
> similar.
>
> Emily
>
>
> Alessandro Sferrazza wrote:
> > Hi uDig'gers!
> > I have a Class that extend AbstractEditTool.	
> > I need to get the feature selected by clicking on the map, in the
> > method mousePressed of my class so that I can modify its attributes.
> > I have worked on the following code
> > IMap map = ApplicationGIS.getActiveMap();
> > FeatureSource  
> > source=map.getEditManager().getSelectedLayer().getResource(
> > FeatureSource.class,  new NullProgressMonitor());
> > FeatureCollection collection=source.getFeatures();
> > But it retuns all the features on Selected layer and not the  
> > 'Clicked'
> > single one.
> > Regards
> > Alessandro Sferrazza
> > _______________________________________________
> > User-friendly Desktop Internet GIS (uDig)
> > http://udig.refractions.net
> > http://lists.refractions.net/mailman/listinfo/udig-devel
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