Sorry, forgot to hit send on my draft.
I like this idea and I think the streaming renderer pass is the better
route as it should give the answer the user is expecting (at least for
small numbers where they might count by hand :-))
Ian
On 26 April 2017 at 10:50, Andrea Aime <andrea.a...@geo-solutions.it> wrote:
> Looks like nobody is particularly concerned, so moving on with current plan
>
> Cheers
> Andrea
>
> On Mon, Apr 24, 2017 at 2:59 PM, Andrea Aime <andrea.a...@geo-solutions.it
> > 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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>>
>>
>>
>> The information in this message and/or attachments, is intended solely
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>> 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
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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 <+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*
>
> 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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--
Ian Turton
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