def grid_labeler(self, coord_base_x, coord_base_y, px, py, u, t, dx, dy,
vAlign, hAlign, desc, fSize, fontType, expression_str,
trLLUTM, trUTMLL, llcolor, utmcheck, scale):
if utmcheck:
pgrid = QgsPoint(coord_base_x + px * u, coord_base_y + py * t)
pgrid.transform(trLLUTM)
pgrid = QgsPoint(pgrid.x() + dx, pgrid.y() + dy)
else:
pgrid = QgsPoint(coord_base_x + px * u + dx,
coord_base_y + py * t + dy)
#Label Format Settings
settings = QgsPalLayerSettings()
settings.Placement = QgsPalLayerSettings.Free
settings.isExpression = True
textprop = QgsTextFormat()
textprop.setColor(llcolor)
textprop.setSizeUnit(1)
textprop.setSize(fSize * scale * 1.324)
textprop.setFont(QFont(fontType))
textprop.setLineHeight(1)
settings.setFormat(textprop)
settings.fieldName = expression_str
#Label Name and Position
datadefined = QgsPropertyCollection()
datadefined.setProperty(9, pgrid.x())
datadefined.setProperty(10, pgrid.y())
if not (hAlign == ''):
datadefined.setProperty(11, hAlign)
if not (vAlign == ''):
datadefined.setProperty(12, vAlign)
datadefined.setProperty(20, 1)
#Creating and Activating Labeling Rule
settings.setDataDefinedProperties(datadefined)
rule = QgsRuleBasedLabeling.Rule(settings)
rule.setDescription(desc)
rule.setActive(True)
return rule
def createRules(self, label, expression):
'''
Returns a QgsRuleBasedLabeling based on label and expression
'''
settings = QgsPalLayerSettings()
settings.fieldName = label
settings.Placement = QgsPalLayerSettings.OverPoint
settings.centroidInside = True
settings.isExpression = True
textFormat = QgsTextFormat()
textFormat.setColor(QColor(0, 0, 0, 255))
textFormat.setSize(6)
textBuffer = QgsTextBufferSettings()
textBuffer.setColor(QColor(255, 255, 255, 255))
textBuffer.setSize(0.4)
textBuffer.setEnabled(True)
textFormat.setBuffer(textBuffer)
settings.setFormat(textFormat)
rule = QgsRuleBasedLabeling.Rule(settings)
rule.setFilterExpression(expression)
rule.setActive(True)
return rule
