Re: [Plastic-devs] Idenitifying different subsets [was Re: Also....

[Marco C. <mc...@oa...>]

John Taylor wrote:
> 
> Thomas Boch wrote:
> 
>>Hi John,
>>
>>Being able to identify groups within tables might also be interest for
>>me (in Aladin). I don't quite understand at which level the groupId is
>>defined. Could you elaborate a bit more, and give an example ?
>>  
> 
> Hi Thomas - the use case we're thinking of is that Eirik (say) runs a 
> clustering algorithm on the VOTable and identifies (say) 3 clusters.  It 
> would be nice if Eirik could then ask Aladin to display those 3 clusters 
> in different colours, or using different symbols.  I'd prefer to keep 
> the groupings at an abstract level, rather than Eirik specifying the 
> colours or symbols itself and allow the receiving application to decide 
> what to do with them.  e.g. VisIVO could map from groupIds to colours, 
> Aladin from groupIds to symbols, and Topcat could map each group to a 
> different subset...whatever makes sense for the receiving application.

Dear all application devs,

what do you think about clearing the selection? I think it would be
useful to have a way to clear a selection or a multiple selection (see
groups). Maybe the simplest way to do that would be to send a showObject
message with an empty array of rows. As an example: if the user makes a
selection in Aladin the selected points will be highlighted in all
VisIVO's visualization windows displaying the dataset, but if you
clear the selection in Aladin (clicking on an empty region) the
selection will remain active in VisIVO,  in this case it would be great
to receive an empty list of objects to show.

Cheers,
Marco

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