def subRenderer(self, color):
lineSymbol = QgsLineSymbolV2()
arrowSymbol = QgsArrowSymbolLayer().create()
arrowSymbol.setArrowWidth(0.0)
arrowSymbol.setArrowStartWidth(0.0)
arrowSymbol.setColor(color)
arrowSymbol.setIsCurved(False)
arrowSymbol.setIsRepeated(False)
renderSetting = QgsRenderContext()
renderSetting.setFlag(QgsRenderContext.Antialiasing, False)
renderSetting.setFlag(QgsRenderContext.DrawSymbolBounds, False)
renderSetting.setFlag(QgsRenderContext.ForceVectorOutput, False)
renderSetting.setFlag(QgsRenderContext.UseAdvancedEffects, False)
renderSetting.setFlag(QgsRenderContext.UseRenderingOptimization, False)
arrEffectStack = arrowSymbol.paintEffect()
effList = arrEffectStack.effectList()
for i in range(0, len(effList)):
if type(effList[i]) == QgsDrawSourceEffect:
effList[i].setDrawMode(1)
arrEffectStack.setEnabled(True)
lineSymbol.appendSymbolLayer(arrowSymbol)
return lineSymbol
def changeSymbol(self):
"""Change symbology from seleted layer"""
if isinstance(self.lyr.renderer(),QgsSingleSymbolRenderer) == True:
symbLyr = QgsArrowSymbolLayer()
symbLyr.setIsCurved(False)
symbLyr.setIsRepeated(True)
self.lyr.renderer().symbol().changeSymbolLayer(0, symbLyr)
self.lyr.triggerRepaint()
self.iface.layerTreeView().refreshLayerSymbology(self.lyr.id())
else:
QMessageBox.warning(None,"Can't change symbology","The layer must be single symbol")
