By the way, forgot one thing... there is a function that can see the whole
collection, it's the rendering
transformation one.
So I guess if you wanted, you could use that one to do the computation, and
bake directly into the
attributes the color you want, and then in the style you just pick the
color.
See also:
http://docs.geoserver.org/2.5.x/en/developer/programming-guide/wps-services/implement-rendertrans.html
Cheers
Andrea
On Fri, Jan 30, 2015 at 4:15 PM, Andrea Aime <[email protected]>
wrote:
> 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
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> ==
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> Ing. Andrea Aime
> @geowolf
> Technical Lead
>
> GeoSolutions S.A.S.
> Via Poggio alle Viti 1187
> 55054 Massarosa (LU)
> Italy
> phone: +39 0584 962313
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> http://www.geo-solutions.it
> http://twitter.com/geosolutions_it
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--
==
GeoServer Professional Services from the experts! Visit
http://goo.gl/NWWaa2 for more information.
==
Ing. Andrea Aime
@geowolf
Technical Lead
GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272
mob: +39 339 8844549
http://www.geo-solutions.it
http://twitter.com/geosolutions_it
*AVVERTENZE AI SENSI DEL D.Lgs. 196/2003*
Le informazioni contenute in questo messaggio di posta elettronica e/o
nel/i file/s allegato/i sono da considerarsi strettamente riservate. Il
loro utilizzo è consentito esclusivamente al destinatario del messaggio,
per le finalità indicate nel messaggio stesso. Qualora riceviate questo
messaggio senza esserne il destinatario, Vi preghiamo cortesemente di
darcene notizia via e-mail e di procedere alla distruzione del messaggio
stesso, cancellandolo dal Vostro sistema. Conservare il messaggio stesso,
divulgarlo anche in parte, distribuirlo ad altri soggetti, copiarlo, od
utilizzarlo per finalità diverse, costituisce comportamento contrario ai
principi dettati dal D.Lgs. 196/2003.
The information in this message and/or attachments, is intended solely for
the attention and use of the named addressee(s) and may be confidential or
proprietary in nature or covered by the provisions of privacy act
(Legislative Decree June, 30 2003, no.196 - Italy's New Data Protection
Code).Any use not in accord with its purpose, any disclosure, reproduction,
copying, distribution, or either dissemination, either whole or partial, is
strictly forbidden except previous formal approval of the named
addressee(s). If you are not the intended recipient, please contact
immediately the sender by telephone, fax or e-mail and delete the
information in this message that has been received in error. The sender
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made after they were sent or for other risks which arise as a result of
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