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108 lines
3.6 KiB
Python
108 lines
3.6 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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SetMValue.py
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--------------
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Date : July 2017
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Copyright : (C) 2017 by Nyall Dawson
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Email : nyall dot dawson at gmail dot com
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************
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"""
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__author__ = 'Nyall Dawson'
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__date__ = 'July 2017'
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__copyright__ = '(C) 2017, Nyall Dawson'
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# This will get replaced with a git SHA1 when you do a git archive323
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__revision__ = '$Format:%H$'
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import os
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from qgis.core import (QgsGeometry,
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QgsWkbTypes,
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QgsPropertyDefinition,
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QgsProcessingParameters,
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QgsProcessingParameterNumber,
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QgsProcessingFeatureSource)
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from processing.algs.qgis.QgisAlgorithm import QgisFeatureBasedAlgorithm
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class SetMValue(QgisFeatureBasedAlgorithm):
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M_VALUE = 'M_VALUE'
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def group(self):
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return self.tr('Vector geometry')
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def groupId(self):
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return 'vectorgeometry'
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def __init__(self):
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super().__init__()
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self.m_value = 0
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self.dynamic_m = False
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self.m_property = None
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def name(self):
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return 'setmvalue'
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def displayName(self):
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return self.tr('Set M value')
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def outputName(self):
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return self.tr('M Added')
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def tags(self):
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return self.tr('set,add,m,measure,values').split(',')
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def initParameters(self, config=None):
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m_param = QgsProcessingParameterNumber(self.M_VALUE,
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self.tr('M Value'), QgsProcessingParameterNumber.Double, defaultValue=0.0)
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m_param.setIsDynamic(True)
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m_param.setDynamicLayerParameterName('INPUT')
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m_param.setDynamicPropertyDefinition(QgsPropertyDefinition(self.M_VALUE, self.tr("M Value"), QgsPropertyDefinition.Double))
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self.addParameter(m_param)
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def outputWkbType(self, inputWkb):
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return QgsWkbTypes.addM(inputWkb)
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def prepareAlgorithm(self, parameters, context, feedback):
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self.m_value = self.parameterAsDouble(parameters, self.M_VALUE, context)
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self.dynamic_m = QgsProcessingParameters.isDynamic(parameters, self.M_VALUE)
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if self.dynamic_m:
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self.m_property = parameters[self.M_VALUE]
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return True
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def sourceFlags(self):
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return QgsProcessingFeatureSource.FlagSkipGeometryValidityChecks
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def processFeature(self, feature, context, feedback):
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input_geometry = feature.geometry()
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if input_geometry:
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new_geom = input_geometry.constGet().clone()
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if QgsWkbTypes.hasM(new_geom.wkbType()):
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# addMValue won't alter existing M values, so drop them first
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new_geom.dropMValue()
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m = self.m_value
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if self.dynamic_m:
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m, ok = self.m_property.valueAsDouble(context.expressionContext(), m)
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new_geom.addMValue(m)
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feature.setGeometry(QgsGeometry(new_geom))
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return [feature]
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