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b1cadb1822
have specific icons, instead of generic qgis icon We consider these 'top level' algorithms, and using the standard algorithm icon should help reflect this and differentiate them from 3rd party algorithms.
121 lines
5.1 KiB
Python
121 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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QgsFeatureSink,
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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.QgisAlgorithm 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 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, QgsFeatureSink.FastInsert)
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feedback.setProgress(50 + int(current * total))
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del writer
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