[Qgis-developer] (python) access to QgsHillshadeRenderer of raster layer ?

Nyall Dawson nyall.dawson at gmail.com
Sun Apr 9 15:53:34 PDT 2017

On 10 April 2017 at 08:30, Andreas Plesch <andreasplesch at gmail.com> wrote:
>> Date: Sat, 8 Apr 2017 13:51:43 -0700 (MST)
>> From: Tom Chadwin <tom.chadwin at nnpa.org.uk>
>> They should be there:
>> https://qgis.org/api/classQgsHillshadeRenderer.html
> Thanks. Yes, they are there. The problem is I cannot find a way to get to
> the QgisHillshadeRenderer itself, from the QgsRasterLayer.
> QgsRasterLayer.renderer() only provides QgsRasterRenderer. Anyways, the
> .writeXML approach works well enough. [ It is a bit strange that the
> altitude is named angle as an xml attribute. ]
> Ideally, I would want to get the lightAzimuth and lightAltitude values from
> the hillshaderendererwidget used in the layer properties gui . Is there a
> way to get that from a processing python script (or plugin)? The idea is to
> use existing values provided in the nice existing GUIs as much as possible.

There was a missing sip cast for QgsHillshadeRenderer - without this
in place you only get access to the common QgsRasterRenderer methods.

It's fixed in https://github.com/qgis/QGIS/commit/8cf5860d72e6c7d4c7345b3a880020263549a93c


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