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126 lines
5.1 KiB
Python
126 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 QVariant
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from qgis.core import (QgsApplication,
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QgsFields,
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QgsField,
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QgsFeature,
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QgsGeometry,
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QgsWkbTypes,
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QgsFeatureRequest,
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QgsProcessingUtils)
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from processing.algs.qgis import QgisAlgorithm
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from processing.core.parameters import ParameterVector
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from processing.core.parameters import ParameterBoolean
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from processing.core.outputs import OutputVector
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from processing.tools import dataobjects
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class Polygonize(QgisAlgorithm):
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INPUT = 'INPUT'
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OUTPUT = 'OUTPUT'
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FIELDS = 'FIELDS'
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GEOMETRY = 'GEOMETRY'
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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('create,lines,polygons,convert').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(ParameterVector(self.INPUT,
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self.tr('Input layer'), [dataobjects.TYPE_VECTOR_LINE]))
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self.addParameter(ParameterBoolean(self.FIELDS,
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self.tr('Keep table structure of line layer'), False))
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self.addParameter(ParameterBoolean(self.GEOMETRY,
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self.tr('Create geometry columns'), True))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Polygons from lines'), datatype=[dataobjects.TYPE_VECTOR_POLYGON]))
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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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vlayer = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT), context)
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output = self.getOutputFromName(self.OUTPUT)
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if self.getParameterValue(self.FIELDS):
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fields = vlayer.fields()
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else:
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fields = QgsFields()
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if self.getParameterValue(self.GEOMETRY):
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fieldsCount = fields.count()
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fields.append(QgsField('area', QVariant.Double, 'double', 16, 2))
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fields.append(QgsField('perimeter', QVariant.Double,
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'double', 16, 2))
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allLinesList = []
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features = QgsProcessingUtils.getFeatures(vlayer, context, QgsFeatureRequest().setSubsetOfAttributes([]))
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feedback.pushInfo(self.tr('Processing lines...'))
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total = 40.0 / QgsProcessingUtils.featureCount(vlayer, context)
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for current, inFeat in enumerate(features):
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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(self.tr('Noding lines...'))
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allLines = QgsGeometry.unaryUnion(allLinesList)
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feedback.setProgress(45)
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feedback.pushInfo(self.tr('Polygonizing...'))
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polygons = QgsGeometry.polygonize([allLines])
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if polygons.isEmpty():
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raise GeoAlgorithmExecutionException(self.tr('No polygons were created!'))
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feedback.setProgress(50)
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feedback.pushInfo('Saving polygons...')
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writer = output.getVectorWriter(fields, QgsWkbTypes.Polygon, vlayer.crs(), context)
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total = 50.0 / polygons.geometry().numGeometries()
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for i in range(polygons.geometry().numGeometries()):
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outFeat = QgsFeature()
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geom = QgsGeometry(polygons.geometry().geometryN(i).clone())
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outFeat.setGeometry(geom)
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if self.getParameterValue(self.GEOMETRY):
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outFeat.setAttributes([None] * fieldsCount + [geom.geometry().area(),
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geom.geometry().perimeter()])
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writer.addFeature(outFeat)
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feedback.setProgress(50 + int(current * total))
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del writer
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