Hi, As far as I know symbology is tight to the topology. Here is a simple example for lines.
mlayer = qgis.utils.iface.activeLayer() styles = {'width': '0.5', 'color': 'yellow', 'penstyle': 'solid'} registry = qgis.core.QgsSymbolLayerV2Registry.instance() symbol = qgis.core.QgsSymbolV2.defaultSymbol(mlayer.geometryType()) lineLayer = lineMeta.createSymbolLayer(styles) symbol.deleteSymbolLayer(0) symbol.appendSymbolLayer(lineLayer) renderer = qgis.core.QgsSingleSymbolRendererV2(symbol) mlayer.setRendererV2(renderer) mlayer.triggerRepaint() qgis.utils.iface.mapCanvas().refresh() For points styles = {'name': 'diamond', 'color': 'yellow', 'size': '2'} pointSymbol = qgis.core.QgsMarkerSymbolV2.createSimple(styles) mlayer.rendererV2().setSymbol(pointSymbol) qgis.utils.iface.mapCanvas().refresh() mlayer.triggerRepaint() for polygons symbol.setColor(QtGui.QColor("blue")) registry = QgsSymbolLayerV2Registry.instance() lineMeta = registry.symbolLayerMetadata("SimpleLine") lineLayer = lineMeta.createSymbolLayer({'width': '0.8', 'color': 'blue', 'offset': '0', 'penstyle': 'solid'}) symbol.appendSymbolLayer(lineLayer) symbol.setAlpha(0.2) renderer = QgsRuleBasedRendererV2(symbol) vLayer.setRendererV2(renderer) vLayer.setLayerTransparency(0) vLayer.triggerRepaint() This when you want to have static symbols. QGIS also gives the capability of creating dynamic symbols -----Original Message----- From: Qgis-user <qgis-user-boun...@lists.osgeo.org> On Behalf Of Manuel Campagnolo Sent: June 11, 2021 7:56 AM To: qgis-user@lists.osgeo.org Subject: [EXT] [Qgis-user] Convert symbology of qgis layer into PyQGIS code to define renderer CAUTION: This email originated from outside of the organization. If you do not recognize the sender or you are not certain the content is safe, then do not click on any links or open any attachments. AVERTISSEMENT : Ce courriel provient d’une source externe à l’organisation. Si vous ne reconnaissez pas l’expéditeur ou si vous doutez de la sécurité du contenu, ne cliquez sur aucun lien et n’ouvrez aucune pièce jointe. 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) _______________________________________________ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://urldefense.com/v3/__https://lists.osgeo.org/mailman/listinfo/qgis-user__;!!P0kg3YazkQ!Wh7k2FBqY62GCB78RuenegW_YsQXCfSx7yC8s8SDK5rZJL96TYagaJQFJKb14VXtcg$ Unsubscribe: https://urldefense.com/v3/__https://lists.osgeo.org/mailman/listinfo/qgis-user__;!!P0kg3YazkQ!Wh7k2FBqY62GCB78RuenegW_YsQXCfSx7yC8s8SDK5rZJL96TYagaJQFJKb14VXtcg$ ________________________________ This electronic message, as well as any transmitted files included in the electronic message, may contain privileged or confidential information and is intended solely for the use of the individual(s) or entity to which it is addressed. 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