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

[John T. <jon...@gm...>]

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.

As you say below, we want to keep things simple for applications that 
aren't interested in such complications!


>   
>> Whichever is adopted the groupId should be an optional parameter.  In
>> fact, I'd prefer to see it tacked on in an optional struct at the end
>> showObjects(tableId, rows[], [options])
>> with
>> options={groupdId=int[]}
>>
>> to allow for future expansion.
>>     
>
> The more I think about it, the more I agree that an optional struct is
> the right way to keep simplicity for simple things, yet giving some
> flexibility for more advanced ones. I think it is very important to keep
> the 'entry cost' to PLASTIC as low as possible, otherwise most people
> won't use it.
>
> Cheers,
>
> Thomas
>
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