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119 lines
4.4 KiB
Python
119 lines
4.4 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Difference.py
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---------------------
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Date : August 2012
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Copyright : (C) 2012 by Victor Olaya
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Email : volayaf 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__ = 'Victor Olaya'
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__date__ = 'August 2012'
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__copyright__ = '(C) 2012, Victor Olaya'
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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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import os
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from qgis.PyQt.QtGui import QIcon
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from qgis.core import (QgsFeature,
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QgsFeatureSink,
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QgsGeometry,
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QgsFeatureRequest,
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QgsWkbTypes,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterFeatureSink,
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QgsSpatialIndex)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class Difference(QgisAlgorithm):
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INPUT = 'INPUT'
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OVERLAY = 'OVERLAY'
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OUTPUT = 'OUTPUT'
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def icon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'difference.png'))
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def group(self):
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return self.tr('Vector overlay tools')
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def __init__(self):
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super().__init__()
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def initAlgorithm(self, config=None):
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self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
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self.tr('Input layer')))
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self.addParameter(QgsProcessingParameterFeatureSource(self.OVERLAY,
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self.tr('Difference layer')))
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self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Difference')))
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def name(self):
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return 'difference'
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def displayName(self):
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return self.tr('Difference')
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def processAlgorithm(self, parameters, context, feedback):
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sourceA = self.parameterAsSource(parameters, self.INPUT, context)
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sourceB = self.parameterAsSource(parameters, self.OVERLAY, context)
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geomType = QgsWkbTypes.multiType(sourceA.wkbType())
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(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
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sourceA.fields(), geomType, sourceA.sourceCrs())
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featB = QgsFeature()
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outFeat = QgsFeature()
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indexB = QgsSpatialIndex(sourceB.getFeatures(QgsFeatureRequest().setSubsetOfAttributes([]).setDestinationCrs(sourceA.sourceCrs())), feedback)
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total = 100.0 / (sourceA.featureCount() * sourceB.featureCount()) if sourceA.featureCount() and sourceB.featureCount() else 1
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count = 0
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for featA in sourceA.getFeatures():
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if feedback.isCanceled():
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break
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if featA.hasGeometry():
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geom = featA.geometry()
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diffGeom = QgsGeometry(geom)
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attrs = featA.attributes()
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intersects = indexB.intersects(geom.boundingBox())
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request = QgsFeatureRequest().setFilterFids(intersects).setSubsetOfAttributes([])
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request.setDestinationCrs(sourceA.sourceCrs())
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for featB in sourceB.getFeatures(request):
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if feedback.isCanceled():
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break
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tmpGeom = featB.geometry()
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if diffGeom.intersects(tmpGeom):
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diffGeom = QgsGeometry(diffGeom.difference(tmpGeom))
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outFeat.setGeometry(diffGeom)
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outFeat.setAttributes(attrs)
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sink.addFeature(outFeat, QgsFeatureSink.FastInsert)
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else:
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sink.addFeature(featA, QgsFeatureSink.FastInsert)
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count += 1
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feedback.setProgress(int(count * total))
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return {self.OUTPUT: dest_id}
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