Hi Andreas
Andreas Neumann-4 wrote > Areas in vector tiles are artificially cut into pieces. If you want to > stroke the outlines of the areas you would not only get the wanted > outlines of the original feature geometries, but in addition, also the > unwanted, artificial, borders. Yes, so you buffer the tile during rendering, so that this "internal" stroke falls outside the actual tile boundary, then clip back to the correct dimensions. Andreas Neumann-4 wrote > And even if you just fill and don't stroke, you would get rendering > artefacts (depending on the antialiasing settings of the rendering > library). qt, for instance, does not a good job to avoid rendering > artefacts of adjacent polygons who have a shared outline. You would > still see fine white lines. Would require experiment, but since tile boundaries are always horizontal/vertical, antialiasing issues should be less severe than otherwise. Again, the buffer-then-clip approach above might result in a non-antialiased tile boundary. Andreas Neumann-4 wrote > If you want to label areas, it would also be a problem. Similar > problems, if you want to label LineString data. 100% - labelling is problematic, but an approach is to label all fragments of features, and rely on label collision settings to produce workable output. Andreas Neumann-4 wrote > There just so many unsolved issues with vector tiles (if they aren't > connected properly back to the original geometries by the client) - that > personally I don't bother working with them. Sure, but many do work with them. I guess the points you raise might make the plugin approach the right one - I was just aware of the OGR work, so I thought it should be investigated. At the end of the day, vector tiles exist, and do render correctly in other clients. Thanks for all the info Tom ----- Buy Pie Spy: Adventures in British pastry 2010-11 on Amazon -- Sent from: http://osgeo-org.1560.x6.nabble.com/QGIS-Developer-f4099106.html _______________________________________________ QGIS-Developer mailing list [email protected] List info: https://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-developer
