[Qgis-user] Convert symbology of qgis layer into PyQGIS code to define renderer

[Jorge Gustavo Rocha]

Olá Manuel,

There is no way to get the PyQGIS code from the style, as far as I know.

But you can save the style (using the native QGIS format) and apply the
named style afterwards in PyQGIS easily. Is this alternative workflow
suitable for you?

Regards,

Gustavo

On 11/06/21 12:56, Manuel Campagnolo wrote:
> Hi
>
> Do you know of a way of using the style of a ,say, vector layer in
> QGIS3 to create automatically the python code that would generate it,
> namely the QgsSymbol part in the code below.
>
> Thanks
>
>
> symbol1=QgsSymbol.defaultSymbol(ifn_ppsm.geometryType())
> symbol2=QgsSymbol.defaultSymbol(ifn_ppsm.geometryType())
> symbol3=QgsSymbol.defaultSymbol(ifn_ppsm.geometryType())
> symbol4=QgsSymbol.defaultSymbol(ifn_ppsm.geometryType())
> symbol5=QgsSymbol.defaultSymbol(ifn_ppsm.geometryType())
>
> symbol1.setColor(QColor('black'))
> symbol2.setColor(QColor('gray'))
> symbol3.setColor(QColor('dark green'))
> symbol4.setColor(QColor('light green'))
> symbol5.setColor(QColor('orange'))
>
> cat1=QgsRendererCategory('Improdutivos', symbol1, 'Improdutivos') #
> category, symbol, label
> cat2=QgsRendererCategory('Urbano', symbol2, 'Urbano')
> cat3=QgsRendererCategory('Matos e Pastagens', symbol3, 'Matos e
> Pastagens')
> cat4=QgsRendererCategory('Floresta', symbol4, 'Floresta')
> cat5=QgsRendererCategory('Agricultura', symbol5, 'Agricultura')
> categories=[cat1,cat2,cat3,cat4,cat5] # list
>
> renderer = QgsCategorizedSymbolRenderer('usosolo', categories)
> ifn_ppsm.setRenderer(renderer)
>
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