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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.
89 lines
3.6 KiB
Python
89 lines
3.6 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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DeleteHoles.py
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---------------------
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Date : April 2015
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Copyright : (C) 2015 by Etienne Trimaille
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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__ = 'Etienne Trimaille'
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__date__ = 'April 2015'
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__copyright__ = '(C) 2015, Etienne Trimaille'
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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 (QgsApplication,
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QgsFeatureSink,
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QgsProcessingUtils,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterNumber,
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QgsProcessingParameterFeatureSink,
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QgsProcessingOutputVectorLayer,
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QgsProcessingParameterDefinition)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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class DeleteHoles(QgisAlgorithm):
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INPUT = 'INPUT'
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MIN_AREA = 'MIN_AREA'
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OUTPUT = 'OUTPUT'
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def tags(self):
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return self.tr('remove,delete,drop,holes,rings,fill').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,
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self.tr('Input layer'), [QgsProcessingParameterDefinition.TypeVectorPolygon]))
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self.addParameter(QgsProcessingParameterNumber(self.MIN_AREA,
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self.tr('Remove holes with area less than'), QgsProcessingParameterNumber.Double,
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0, True, 0.0, 10000000.0))
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self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Cleaned'), QgsProcessingParameterDefinition.TypeVectorPolygon))
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self.addOutput(QgsProcessingOutputVectorLayer(self.OUTPUT, self.tr('Cleaned'), QgsProcessingParameterDefinition.TypeVectorPolygon))
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def name(self):
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return 'deleteholes'
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def displayName(self):
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return self.tr('Delete holes')
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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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min_area = self.parameterAsDouble(parameters, self.MIN_AREA, context)
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if min_area == 0.0:
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min_area = -1.0
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(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
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source.fields(), source.wkbType(), source.sourceCrs())
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features = source.getFeatures()
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total = 100.0 / source.featureCount() if source.featureCount() else 0
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for current, f in enumerate(features):
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if feedback.isCanceled():
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break
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if f.hasGeometry():
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f.setGeometry(f.geometry().removeInteriorRings(min_area))
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sink.addFeature(f, QgsFeatureSink.FastInsert)
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feedback.setProgress(int(current * total))
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return {self.OUTPUT: dest_id}
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