[Qgis-developer] QgsFeatureRendererV2.startRender deprecated ...

[Chris Crook]

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.

As yet this has not (as far as I can see) been applied to SIP and python, presumably because the name cannot be overloaded in python.   At the moment this is good for me!  I need to get information about the layer in order to implement a custom renderer.  However this will not be available in the future, which will be a problem.

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?

Thanks
Chris Crook

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