def grid_labeler(self, coord_base_x, coord_base_y, px, py, u, t, dx, dy,
desc, fSize, fontType, expression_str, trLLUTM, llcolor,
layer_bound, trUTMLL):
pgrid = QgsPoint(coord_base_x + px * u, coord_base_y + py * t)
pgrid.transform(trLLUTM)
pgrid = QgsPoint(pgrid.x() + dx, pgrid.y() + dy)
if layer_bound.crs().isGeographic() == True:
pgrid.transform(trUTMLL)
#Label Format Settings
settings = QgsPalLayerSettings()
settings.placement = 1
settings.isExpression = True
textprop = QgsTextFormat()
textprop.setColor(llcolor)
textprop.setSizeUnit(4)
textprop.setSize(fSize * 2.8346)
textprop.setFont(QFont(fontType))
textprop.setLineHeight(1)
settings.setFormat(textprop)
settings.fieldName = expression_str
#Label Position
settings.geometryGeneratorEnabled = True
settings.geometryGenerator = ("make_point({}, {})".format(
pgrid.x(), pgrid.y()))
datadefined = QgsPropertyCollection()
datadefined.property(20).setExpressionString('True')
datadefined.property(20).setActive(True)
datadefined.property(15).setExpressionString('True')
datadefined.property(15).setActive(True)
datadefined.property(77).setExpressionString('2')
datadefined.property(77).setActive(True)
#Creating and Activating Labeling Rule
settings.setDataDefinedProperties(datadefined)
rule = QgsRuleBasedLabeling.Rule(settings)
rule.setDescription(desc)
rule.setActive(True)
return rule
