+1 for the plan, option name of countMatched, and StreamingRenderer for consistency with what the user sees.
Kind regards, Ben. On 26/04/17 21:50, Andrea Aime 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 <[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* >> >> 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. 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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. >> >> ------------------------------------------------------- >> > > > > > > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > > > > _______________________________________________ > Geoserver-devel mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/geoserver-devel > -- Ben Caradoc-Davies <[email protected]> Director Transient Software Limited <http://transient.nz/> New Zealand ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Geoserver-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/geoserver-devel
