[Qgis-user] Nothing displayed if sizeScaleField is set on the renderer

[Lukas]

Hi all

PyQgis question. I'm trying to display magnitudes on a map using pyqgis. I
created a simple QgsVectorLayer that displays a dot at each earthquake
location. This works fine.

I'd like to vary the size of each dot according to each earthquake's
magnitude. I tried the following:

pr = eq_layer.dataProvider()
pr.addAttributes([QgsField('magnitude', QVariant.Double), ...])
...
renderer = self.eq_layer.rendererV2()
renderer.setSizeScaleField('magnitude')

However, as soon as I set the sizeScaleField, the layer stops showing
anything.

What am I missing?



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