[QGIS-Developer] Python rendered size of symbol

[Chris Crook]

I want to calculate the rendered size of a marker symbol for a given feature, when the symbol includes data defined properties.

I'm having trouble navigating the API to determine the steps I need to achieve this!

I think I need to determine the render context for the symbol including the , in terms of the map canvas and the feature being rendered, and then call the symbol size(QgsRenderContext) function with that.  But I haven't figured out how to put together the render context to use in this call.   It looks like part of this is creating a QgsSymbolRendererContext and using .setFeature to create the context for the feature.  But I'm still missing some bits.

Can anyone help with this please?

Or do you know of some documentation describing how the render contexts and expression contexts all fit together?

Thanks.
Chris

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