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Instead we output an empty layer - this may be critical for multi-step models where there is validly no features present in a source layer
94 lines
3.7 KiB
Python
94 lines
3.7 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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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 icon(self):
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return QgsApplication.getThemeIcon("/providerQgis.svg")
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def svgIconPath(self):
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return QgsApplication.iconPath("providerQgis.svg")
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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)
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feedback.setProgress(int(current * total))
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return {self.OUTPUT: dest_id}
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