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129 lines
5.1 KiB
Python
129 lines
5.1 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Polygonize.py
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---------------------
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Date : March 2013
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Copyright : (C) 2013 by Piotr Pociask
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Email : ppociask at o2 dot pl
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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__ = 'Piotr Pociask'
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__date__ = 'March 2013'
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__copyright__ = '(C) 2013, Piotr Pociask'
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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.PyQt.QtCore import QCoreApplication
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from qgis.core import (QgsFields,
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QgsFeature,
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QgsFeatureSink,
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QgsGeometry,
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QgsWkbTypes,
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QgsFeatureRequest,
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QgsProcessing,
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QgsProcessingException,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterBoolean,
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QgsProcessingParameterFeatureSink)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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class Polygonize(QgisAlgorithm):
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INPUT = 'INPUT'
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OUTPUT = 'OUTPUT'
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KEEP_FIELDS = 'KEEP_FIELDS'
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def tags(self):
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return self.tr('create,lines,polygons,convert').split(',')
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def group(self):
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return self.tr('Vector geometry')
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def groupId(self):
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return 'vectorgeometry'
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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'), types=[QgsProcessing.TypeVectorLine]))
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self.addParameter(QgsProcessingParameterBoolean(self.KEEP_FIELDS,
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self.tr('Keep table structure of line layer'), defaultValue=False, optional=True))
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self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Polygons from lines'), QgsProcessing.TypeVectorPolygon))
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def name(self):
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return 'polygonize'
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def displayName(self):
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return self.tr('Polygonize')
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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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if source is None:
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raise QgsProcessingException(self.invalidSourceError(parameters, self.INPUT))
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if self.parameterAsBool(parameters, self.KEEP_FIELDS, context):
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fields = source.fields()
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else:
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fields = QgsFields()
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(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
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fields, QgsWkbTypes.Polygon, source.sourceCrs())
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if sink is None:
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raise QgsProcessingException(self.invalidSinkError(parameters, self.OUTPUT))
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allLinesList = []
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features = source.getFeatures(QgsFeatureRequest().setSubsetOfAttributes([]))
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feedback.pushInfo(QCoreApplication.translate('Polygonize', 'Processing lines…'))
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total = (40.0 / source.featureCount()) if source.featureCount() else 1
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for current, inFeat in enumerate(features):
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if feedback.isCanceled():
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break
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if inFeat.geometry():
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allLinesList.append(inFeat.geometry())
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feedback.setProgress(int(current * total))
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feedback.setProgress(40)
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feedback.pushInfo(QCoreApplication.translate('Polygonize', 'Noding lines…'))
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allLines = QgsGeometry.unaryUnion(allLinesList)
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if feedback.isCanceled():
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return {}
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feedback.setProgress(45)
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feedback.pushInfo(QCoreApplication.translate('Polygonize', 'Polygonizing…'))
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polygons = QgsGeometry.polygonize([allLines])
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if polygons.isEmpty():
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feedback.reportError(self.tr('No polygons were created!'))
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feedback.setProgress(50)
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if not polygons.isEmpty():
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feedback.pushInfo(QCoreApplication.translate('Polygonize', 'Saving polygons…'))
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total = 50.0 / polygons.constGet().numGeometries()
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for i in range(polygons.constGet().numGeometries()):
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if feedback.isCanceled():
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break
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outFeat = QgsFeature()
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geom = QgsGeometry(polygons.constGet().geometryN(i).clone())
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outFeat.setGeometry(geom)
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sink.addFeature(outFeat, QgsFeatureSink.FastInsert)
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feedback.setProgress(50 + int(current * total))
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return {self.OUTPUT: dest_id}
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