This sounds good to me, is there a possibility that it will allow zoom level to become available in SLD as a vendor option or special variable? I'm not suggesting that you do that now but it would be nice if it is possible for future implementations, though I'm not promising that I'll ever get around to it.
Ian On Sat, 10 Aug 2024 at 11:24, Andrea Aime <andrea.a...@geosolutionsgroup.com> wrote: > Hi, > first of all, apologies for the cross post, I've done it because the > refactor I'm proposing concerns both projects. > > I want to add zoom level support in CSS, with a familiar syntax like [@z > = 10] or [@z >= 15], > and an eventual tile matrix set choice as a top level directive like @tms > "myCustomTileMatrixSet". > > In order to do so, I'll need to convert zoom levels to scale denominators, > and look up configured tile > matrix sets in GeoServer. YSLD has this problem basically already solved, > with a set of interfaces and > classes that have apparently nothing YSLD specific: > > - ZoomContext > > <https://github.com/geotools/geotools/blob/029dc5c8ccc503de3cfd7f4d1c939d8056c260c4/modules/extension/ysld/src/main/java/org/geotools/ysld/parse/ZoomContext.java#L27>, > describing relationships between zoom levels and scale denominators (e.g., > part of what a TileMatrixSet does) > - ZoomContextFinder > > <https://github.com/geotools/geotools/blob/029dc5c8ccc503de3cfd7f4d1c939d8056c260c4/modules/extension/ysld/src/main/java/org/geotools/ysld/parse/ZoomContextFinder.java#L27>, > to lookup up ZoomContext by name > - GWCZoomContextFinder > > <https://github.com/geoserver/geoserver/blob/6e9e25c0c7cdda9ada9f33f8255130d3afc76801/src/extension/ysld/src/main/java/org/geoserver/ysld/GWCZoomContextFinder.java#L22>, > to look up specifically GWC configured Tile Matrix Set objects. > > I would like to propose the following refactoring, to reuse the same work > in the CSS parser > > Step 1, move the the ZoomContext* classes to gt-main, inside a new > org.geotools.styling.zoom package > (I've checked, it's not taken). > > Step 2, move the GWCZoomContextFinder into the GWC module, again for > sharing purposes. > > Then I will be able to use the same functionality from the CSS modules. > As an added bonus, I'd like to refactor the gs-ysld module so that it > does not depend on the GWC presence, > as a deploy might use alternative style languages in WMS, without having > tile caching embedded in the same process (e.g., GeoServer Cloud). > The code will look up a ZoomContextFinder using GeoServerExtensions, and > if not found, use the DefaultZoomContextFinder instead. > > If there are no objections, I'll move on with the refactor next week. > > Regards, > > Andrea Aime > > > == > GeoServer Professional Services from the experts! > > Visit http://bit.ly/gs-services-us for more information. > == > > Ing. Andrea Aime > @geowolf > Technical Lead > > GeoSolutions Group > phone: +39 0584 962313 > > fax: +39 0584 1660272 > > mob: +39 339 8844549 > > https://www.geosolutionsgroup.com/ > > http://twitter.com/geosolutions_it > > ------------------------------------------------------- > > Con riferimento alla normativa sul trattamento dei dati personali (Reg. UE > 2016/679 - Regolamento generale sulla protezione dei dati “GDPR”), si > precisa che ogni circostanza inerente alla presente email (il suo > contenuto, gli eventuali allegati, etc.) è un dato la cui conoscenza è > riservata al/i solo/i destinatario/i indicati dallo scrivente. Se il > messaggio Le è giunto per errore, è tenuta/o a cancellarlo, ogni altra > operazione è illecita. Le sarei comunque grato se potesse darmene notizia. > > This email is intended only for the person or entity to which it is > addressed and may contain information that is privileged, confidential or > otherwise protected from disclosure. We remind that - as provided by > European Regulation 2016/679 “GDPR” - copying, dissemination or use of this > e-mail or the information herein by anyone other than the intended > recipient is prohibited. If you have received this email by mistake, please > notify us immediately by telephone or e-mail > _______________________________________________ > GeoTools-Devel mailing list > GeoTools-Devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/geotools-devel > -- Ian Turton
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