[Qgis-developer] QgsDiagramRendererV2 and QgsLinearlyInterpolatedDiagramRenderer properties access

[Christophe Damour]

Hi,

I am working on a QGis 2.6 python plugin in which I use diagram renderers :
dr = QgsLinearlyInterpolatedDiagramRenderer()
...
dr.setUpperValue(myUpperValue)
...
myLayer.setDiagramRenderer(dr)

This works well, and if my data change, I can update the renderer this way :
dr = myLayer.diagramRenderer()
dr.setUpperValue(myNewUpperValue)

Now here is my problem : If I modify myLayer properties from QGis user 
interface, I can't access its diagram properties anymore, because dr = 
myLayer.diagramRenderer() returns a QgsDiagramRendererV2 object instead 
of a QgsLinearlyInterpolatedDiagramRenderer one.
So when I try to set the new upper value, I get this error :
AttributeError: 'QgsDiagramRendererV2' object has no attribute 
'setUpperValue'

Can someone tell me what I am doing wrong ?

Any hint greatly appreciated. Thanks in advance,

-- 
Christophe DAMOUR



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