Hi all,
implementation here (with streaming renderer, docs, and some extras to make
it work along map decorations as well... because it made for a nice example
in the docs):
https://github.com/geoserver/geoserver/pull/2296
Cheers
Andrea
On Mon, Apr 24, 2017 at 2:59 PM, Andrea Aime <[email protected]>
wrote:
> Hi,
> I'm writing this mail to propose (on behalf of a sponsor) a small new
> feature for GetFeatureInfo,
> that is, the ability to report the number of matched features in the
> requested area as part
> of the legend.
> It is not the more commonly requested "show only the entries with at least
> one item in the map",
> but it lowers its implementation bar significantly, making it more likely
> to get sponsored in the future.
>
> The request would look like:
>
> http://host/geoserver/wms?REQUEST=GetLegendGraphic&;
> VERSION=1.0.0&FORMAT=image/png&WIDTH=20&HEIGHT=20*&LAYER=topp:states* //
> std legend graphics so far
> *&SRS=EPSG%3A4326&SRCWIDTH=768&SRCHEIGHT=330&BBOX=-97.7783203125%2C37.078857421875%2C-89.3408203125%2C40.704345703125
> // *identify area of interest
> *&LEGEND_OPTIONS=countMatched:true // activate the counting mode*
>
> In order:
>
> - A standard GetLegendGraphics request, but with a layer parameter
> (normally optional, but mandatory in this case)
> - The part of a GetMap that identifies the current area, using the
> same syntax as GetMap, minus the "src" prefix for width and height, as they
> would otherwise conflict with the legend icon size
> - A legend option to enable it (the implementation of the "return only
> the rules show in the map" would differ only in this bit)
>
> The output would be something like this, with the count within
> parenthesis: (graphics as text for the sake of expediency):
>
> [greenSquare] Parks and green spaces (10)
> [blueSquare] Water (3)
> [graySquare] Urban (150)
>
> Implementation wise, I'm still a bit torn between a CountVisitor call and
> a StreamingRenderer pass, but I believe
> I'll do the second. Rationale: the logic of a count would need to consider
> symbols sizes and whether the output
> actually contributes to the visible map, and with a thematic map would end
> up having to issue multiple queries,
> and would end up returning a count that does not always exactly match the
> map on screen.
> A StreamingRenderer call against a fake Graphics2D would do a single pass
> instead (faster than the equivalent
> GetMap for sure) and would end up counting what the user actually sees
> instead (it would be in line with
> the current GetFeatureInfo implementation, doing the same).
>
> Feedback welcomed. If you think something *needs* to be changed I would
> appreciate if you could mark
> such comments clearly (I often get confused by comments that is not meant
> to ask for a change, but could be
> interpreted as such).
>
> Cheers
> Andrea
>
> --
> ==
> GeoServer Professional Services from the experts! Visit
> http://goo.gl/it488V for more information.
> ==
>
> Ing. Andrea Aime
> @geowolf
> Technical Lead
>
> GeoSolutions S.A.S.
> Via di Montramito 3/A
> 55054 Massarosa (LU)
> phone: +39 0584 962313 <+39%200584%20962313>
> fax: +39 0584 1660272 <+39%200584%20166%200272>
> mob: +39 339 8844549 <+39%20339%20884%204549>
>
> http://www.geo-solutions.it
> http://twitter.com/geosolutions_it
>
> *AVVERTENZE AI SENSI DEL D.Lgs. 196/2003*
>
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> -------------------------------------------------------
>
--
==
GeoServer Professional Services from the experts! Visit
http://goo.gl/it488V for more information.
==
Ing. Andrea Aime
@geowolf
Technical Lead
GeoSolutions S.A.S.
Via di Montramito 3/A
55054 Massarosa (LU)
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
does not give any warranty or accept liability as the content, accuracy or
completeness of sent messages and accepts no responsibility for changes
made after they were sent or for other risks which arise as a result of
e-mail transmission, viruses, etc.
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