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Since it's safe to evaluate parameters in background threads now, it's usually going to be ok to evaluate everything in the processAlgorithm step. This keeps the algorithm code as simple as possible, and will make porting faster. Note that the prepare/postProcess virtual methods still exist and can be used when an algorithm MUST do setup/cleanup work in the main thread.
102 lines
4.3 KiB
Python
102 lines
4.3 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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FixGeometry.py
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-----------------------
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Date : January 2017
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Copyright : (C) 2017 by Alexander Bruy
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Email : alexander dot bruy 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__ = 'Alexander Bruy'
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__date__ = 'January 2017'
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__copyright__ = '(C) 2017, Alexander Bruy'
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# This will get replaced with a git SHA1 when you do a git archive
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__revision__ = '$Format:%H$'
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from qgis.core import (QgsWkbTypes,
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QgsFeatureSink,
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QgsFeatureRequest,
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QgsProcessingFeatureSource,
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QgsGeometry,
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QgsProcessingParameterDefinition,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterFeatureSink,
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QgsProcessingOutputVectorLayer)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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class FixGeometry(QgisAlgorithm):
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INPUT = 'INPUT'
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OUTPUT = 'OUTPUT'
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def tags(self):
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return self.tr('repair,invalid,geometry').split(',')
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def group(self):
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return self.tr('Vector geometry tools')
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def __init__(self):
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super().__init__()
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self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT, self.tr('Input layer'), [QgsProcessingParameterDefinition.TypeVectorLine, QgsProcessingParameterDefinition.TypeVectorPolygon]))
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self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Fixed geometries')))
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self.addOutput(QgsProcessingOutputVectorLayer(self.OUTPUT, self.tr("Fixed geometries")))
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def name(self):
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return 'fixgeometries'
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def displayName(self):
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return self.tr('Fix geometries')
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def processAlgorithm(self, parameters, context, feedback):
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source = self.parameterAsSource(parameters, self.INPUT, context)
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(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
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source.fields(), QgsWkbTypes.multiType(source.wkbType()), source.sourceCrs())
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features = source.getFeatures(QgsFeatureRequest(), QgsProcessingFeatureSource.FlagSkipGeometryValidityChecks)
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total = 100.0 / source.featureCount() if source.featureCount() else 0
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for current, inputFeature in enumerate(features):
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if feedback.isCanceled():
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break
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outputFeature = inputFeature
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if inputFeature.geometry():
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outputGeometry = inputFeature.geometry().makeValid()
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if not outputGeometry:
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feedback.pushInfo('makeValid failed for feature {}'.format(inputFeature.id()))
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if outputGeometry.wkbType() == QgsWkbTypes.Unknown or QgsWkbTypes.flatType(outputGeometry.geometry().wkbType()) == QgsWkbTypes.GeometryCollection:
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tmpGeometries = outputGeometry.asGeometryCollection()
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for g in tmpGeometries:
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if g.type() == inputFeature.geometry().type():
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try:
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g.convertToMultiType()
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outputFeature.setGeometry(QgsGeometry(g))
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sink.addFeature(outputFeature, QgsFeatureSink.FastInsert)
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except:
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pass
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feedback.setProgress(int(current * total))
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continue
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outputGeometry.convertToMultiType()
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outputFeature.setGeometry(outputGeometry)
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sink.addFeature(outputFeature, QgsFeatureSink.FastInsert)
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feedback.setProgress(int(current * total))
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return {self.OUTPUT: dest_id}
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