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06c4b07222
Since the layer has more complete knowledge of the crs (ie, when provider could not determine crs and user has selected it from the list), and also better knowledge of layer fields (virtual fields, joined fields) we should use these rather than the provider methods.
81 lines
3.1 KiB
Python
81 lines
3.1 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, QgsFeature
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from processing.core.parameters import ParameterVector
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from processing.core.outputs import OutputVector
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from processing.tools import dataobjects, vector
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class ReverseLineDirection(GeoAlgorithm):
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INPUT_LAYER = 'INPUT_LAYER'
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OUTPUT_LAYER = 'OUTPUT_LAYER'
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Reverse line direction')
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self.group, self.i18n_group = self.trAlgorithm('Vector geometry tools')
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self.addParameter(ParameterVector(self.INPUT_LAYER,
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self.tr('Input layer'), [ParameterVector.VECTOR_TYPE_LINE]))
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self.addOutput(OutputVector(self.OUTPUT_LAYER, self.tr('Reversed')))
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def processAlgorithm(self, progress):
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layer = dataobjects.getObjectFromUri(
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self.getParameterValue(self.INPUT_LAYER))
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writer = self.getOutputFromName(
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self.OUTPUT_LAYER).getVectorWriter(
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layer.fields().toList(),
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layer.wkbType(),
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layer.crs())
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outFeat = QgsFeature()
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features = vector.features(layer)
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total = 100.0 / len(features)
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for current, inFeat in enumerate(features):
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inGeom = inFeat.geometry()
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attrs = inFeat.attributes()
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outGeom = None
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if not inGeom.isEmpty():
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reversedLine = inGeom.geometry().reversed()
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if not reversedLine:
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raise GeoAlgorithmExecutionException(
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self.tr('Error reversing line'))
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outGeom = QgsGeometry(reversedLine)
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outFeat.setGeometry(outGeom)
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outFeat.setAttributes(attrs)
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writer.addFeature(outFeat)
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progress.setPercentage(int(current * total))
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del writer
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