On Mon, Apr 04, 2016 at 10:25:35AM +1000, Nyall Dawson wrote: > On 3 April 2016 at 01:27, Sandro Santilli <[email protected]> wrote:
> > Being able to use canvas-dependent variables (extent and scale, > > mostly) would help a lot with speeding up some kind of query > > layers (TopoGeometry ones, for example). > > Be aware that this would not be possible in a vector layer filter. > Expressions at the vector layer level will only have access to global, > project and layer variables. Think about it this way - if the project > has multiple maps in various composers, which extent and scale would > be used when fetching features from the layer for something which > isn't specific to an individual map (Eg the attribute table). How's the current support for "simplify at the provider side" done ? It seems to have the exact same constraints of the ones you're mentioning (yes, I've seen the recent thread about $area parameter changing value across zoom levels, which seems to be one of those side-effects). --strk; _______________________________________________ Qgis-user mailing list [email protected] List info: http://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-user
