Hi Chris On Mon, Sep 12, 2016 at 10:18 AM, Chris Crook <[email protected]> wrote: > Hi All > > > > I see that the version of QgsFeatureRendererV2.startRender taking a > QgsVectorLayer as a second parameter is deprecated in favour of a version > taking a field list.
Yes it has been deprecated because since 2.4 rendering is normally done in a worker thread and having direct access to the layer would be unsafe. > In particular I want to get the layer CRS in order to determine the > relationship between true north and projection north, so that I can apply > this rotation to the symbol. It is not clear to me where I can get this > from once the deprecated implementation of startRender is removed. Possibly > this could be added to the QGS render context? I can access coordinate > transformations there, but I don't see that as a guaranteed API for getting > the source CRS. Any suggestions? One can get source CRS from the coordinate transform (from render context): context.coordinateTransform().sourceCrs() - why isn't that a guaranteed API? An alternative would be to pass layer's CRS to the renderer object when the renderer is created. Regards Martin _______________________________________________ Qgis-developer mailing list [email protected] List info: http://lists.osgeo.org/mailman/listinfo/qgis-developer Unsubscribe: http://lists.osgeo.org/mailman/listinfo/qgis-developer
