Agreed, rendering artifacts are not worth supporting the symbol-avoid-edges: false case. This is one instance where we shouldn't try and match server-side behavior with client-side.
Since this does mean that the "symbol-avoid-edges" rule won't have any effect server-side, it should also be marked as not supported in our GT MBStyle spec (even though it's effectively "always-on" instead of "always-off"). Cheers, Torben On Wed, Dec 11, 2019 at 2:21 AM Andrea Aime <andrea.a...@geo-solutions.it> wrote: > Hi, > I'm looking at a tiled map generated via MBTiles + MBSTyles and getting > this output: > > [image: image.png] > > Notice the two cut labels, should have been "Piano di Mommio" and "SR439". > This is happening because by default Mapbox Styles allow labels to cross > tile borders: > > https://docs.mapbox.com/mapbox-gl-js/style-spec/#layout-symbol-symbol-avoid-edges > And there is a lengthly explanation of why it's done also in the code: > > https://github.com/geotools/geotools/blob/master/modules/unsupported/mbstyle/src/main/java/org/geotools/mbstyle/layer/SymbolMBLayer.java#L1855 > > Except that the output above is not acceptable... and I believe we should > just ignore the setting, because > the context is just not the same. In client side rendering, a label will > not be cut, it can still be painted fully, > worst case it's going to overlap with some other labels. > Server side instead, there is no setting to force the appearance of the > label in the other tile, they are produced > independently and are working against different geometries (clipping). > > Opinions? > > 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 fax: +39 0584 1660272 mob: +39 339 8844549 > http://www.geo-solutions.it 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 >
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