Moving this to the dev list.
It seems to me that in order for a Filter to be passed to GetLegendGraphic
instead of a Rule name, I'd have to render the entire layer internally first
with the Filter applied, then check which Rules are valid and create the legend
graphic based on that. Seems like a bit too much overhead just to create a
single legend graphic. Perhaps there is a better way.
Interested to hear if anyone has any ideas (or just confirm if my assumption is
correct)>
Regards,
Miles
Miles Jordan wrote:
> Hi Guys,
>
> Is there any current way to use a Filter on GetLegendGraphic requests?
>
> I have 10 Rules colouring features different colours. When I request a
> subset of the features for my map using GetMap with a Filter, I'd like a
> way for the legend to only show the styles of the features that are on
> the map, so I need to construct my GetLegendGraphic request accordingly.
>
> I know you can specify a Rule in the GetLegendGRaphic request, but
> there's really no way of my application knowing which Rule to ask for,
> seeing as it is only used by Geoserver internally. What would be more
> useful is to request a legend graphic for a layer based on a Filter.
>
> Any ideas? I'm happy to have a go at it if nobody knows a way I can
> already do it.
>
> Regards,
>
> Miles
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