I'm making a plugin for QGIS that displays aircrafts in real time. This is how I am setting the symbol styles, but I don't know how to set the angle based on the heading of the airplane. I can do it manually (shown in photo) but I need a way to set this using Python in my plugin. I change the position of each feature as it changes, is there a way I can change a feature rotation? Or is there a way to change the symbol style to set the angle by field attribute?

layer = iface.activeLayer()
symbol = layer.renderer().symbol()

svgStyle = {}
svgStyle['fill'] = '#000000'
svgStyle['name'] = 'C:/OSGeo4W64/apps/qgis/svg/transport/transport_airport.svg'
svgStyle['outline'] = '#000000'
svgStyle['outline-width'] = '0.3'
svgStyle['size'] = '7'

symbol_layer = QgsSvgMarkerSymbolLayer.create(svgStyle)
symbol.changeSymbolLayer(0, symbol_layer)

Manually setting symbol rotation in QGIS

1 Answer 1


The property you're looking for is a method from QgsMarkerSymbol it's called dataDefinedAngle(), you can change it by using setDataDefinedAngle(). This method requires a QgsProperty based on a field. You need to create it with the method fromField().

You just need to add this one line at the end of your snippet :

  • 1
    That worked! Thank you so much! Jun 16, 2021 at 18:09

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