On 5 Apr 2016 17:17, "Sandro Santilli" <s...@keybit.net> wrote: > > On Mon, Apr 04, 2016 at 10:25:35AM +1000, Nyall Dawson wrote: > > On 3 April 2016 at 01:27, Sandro Santilli <s...@keybit.net> 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).
That's done on the feature request. What's the topology issue you're hoping to solve with this? Nyall > > --strk;
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