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43cd62b62f
Instead of returning a single QgsFeature from processFeature, we now return a list of features. This allows feature based algorithms which return multiple features per input feature, e.g. "explode" type algorithms which split a single input feature into multiple output features.
71 lines
2.3 KiB
Python
71 lines
2.3 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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ReverseLineDirection.py
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-----------------------
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Date : November 2015
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Copyright : (C) 2015 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__ = 'November 2015'
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__copyright__ = '(C) 2015, 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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from qgis.core import (QgsGeometry,
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QgsProcessingException,
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QgsProcessing)
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from processing.algs.qgis.QgisAlgorithm import QgisFeatureBasedAlgorithm
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class ReverseLineDirection(QgisFeatureBasedAlgorithm):
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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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def name(self):
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return 'reverselinedirection'
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def displayName(self):
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return self.tr('Reverse line direction')
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def outputName(self):
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return self.tr('Reversed')
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def outputType(self):
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return QgsProcessing.TypeVectorLine
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def inputLayerTypes(self):
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return [QgsProcessing.TypeVectorLine]
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def processFeature(self, feature, context, feedback):
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if feature.geometry():
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inGeom = feature.geometry()
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reversedLine = inGeom.constGet().reversed()
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if not reversedLine:
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raise QgsProcessingException(
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self.tr('Error reversing line'))
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outGeom = QgsGeometry(reversedLine)
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feature.setGeometry(outGeom)
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return [feature]
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