" return different values every time, because the feature collection the
renderer gets is relative only
to the current bbox."
Actually that's what I want.
For example when you use the Heatmap process when you zoom in there is a
kind of rescaling to match the zone you are zooming into.
I would like to have this kind of effect with the Choropleth map. Each time
I zoom the min value and max value change and the colors of polygons
recompute for the current zoom level.
I don't even know if it is possible that s why I wanted to ask on the
mailing list
Best regards
Matthieu Bonventi
2015. 1. 30. 오후 4:15에 "Andrea Aime" <[email protected]>님이 작성:
> On Thu, Jan 29, 2015 at 2:59 PM, Bonventi Matthieu <
> [email protected]> wrote:
>
>> Any idea about how I can use them ? I mean it would be cool if I could
>> get a max value and a min value from these function and use them as
>> parameter for the function which calculate and return the color.
>>
>>
> Not so easy though... the issue is that you cannot pass the whole feature
> collection to a filter function in a style,
> they are always fed feature by feature.
>
> Also, computing the min/max value would be rather expensive to do on a
> call by call basis, and would also
> return different values every time, because the feature collection the
> renderer gets is relative only
> to the current bbox.
>
> Long story short, it's better to pre-compute these values (against the
> whole dataset, and once
> for all).
> One idea that might work would be to have a GeoServer extension that
> computes the extrema
> values on the full dataset periodically, or event based, and attach them
> to the layer info/resource info
> metadata map, and then have another extension that feeds these values into
> the env function,
> for the styles to pick up at runtime.
> Just thinking out loud.
>
> Cheers
> Andrea
>
>
> --
> ==
> GeoServer Professional Services from the experts! Visit
> http://goo.gl/NWWaa2 for more information.
> ==
>
> Ing. Andrea Aime
> @geowolf
> Technical Lead
>
> GeoSolutions S.A.S.
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>
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