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159 lines
6.0 KiB
Python
159 lines
6.0 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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SinglePartsToMultiparts.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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from builtins import str
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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 Qgis, QgsFeature, QgsGeometry, QgsWkbTypes
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from processing.core.GeoAlgorithm import GeoAlgorithm
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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 ParameterTableField
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from processing.core.outputs import OutputVector
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from processing.tools import dataobjects, vector
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class SinglePartsToMultiparts(GeoAlgorithm):
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INPUT = 'INPUT'
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FIELD = 'FIELD'
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OUTPUT = 'OUTPUT'
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def getIcon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'single_to_multi.png'))
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Singleparts to multipart')
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self.group, self.i18n_group = self.trAlgorithm('Vector geometry tools')
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self.addParameter(ParameterVector(self.INPUT, self.tr('Input layer')))
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self.addParameter(ParameterTableField(self.FIELD,
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self.tr('Unique ID field'), self.INPUT))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Multipart')))
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def processAlgorithm(self, progress):
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layer = dataobjects.getObjectFromUri(self.getParameterValue(self.INPUT))
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fieldName = self.getParameterValue(self.FIELD)
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geomType = self.singleToMultiGeom(layer.wkbType())
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(
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layer.fields().toList(), geomType, layer.crs())
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inFeat = QgsFeature()
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outFeat = QgsFeature()
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inGeom = QgsGeometry()
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outGeom = QgsGeometry()
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index = layer.fields().lookupField(fieldName)
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unique = vector.getUniqueValues(layer, index)
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current = 0
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features = vector.features(layer)
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total = 100.0 / (len(features) * len(unique))
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if not len(unique) == layer.featureCount():
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for i in unique:
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multi_feature = []
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first = True
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features = vector.features(layer)
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for inFeat in features:
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atMap = inFeat.attributes()
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idVar = atMap[index]
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if str(idVar).strip() == str(i).strip():
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if first:
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attrs = atMap
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first = False
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inGeom = inFeat.geometry()
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vType = inGeom.type()
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feature_list = self.extractAsMulti(inGeom)
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multi_feature.extend(feature_list)
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current += 1
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progress.setPercentage(int(current * total))
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outFeat.setAttributes(attrs)
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outGeom = QgsGeometry(self.convertGeometry(multi_feature,
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vType))
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outFeat.setGeometry(outGeom)
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writer.addFeature(outFeat)
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del writer
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else:
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raise GeoAlgorithmExecutionException(
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self.tr('At least two features must have same attribute '
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'value! Please choose another field...'))
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def singleToMultiGeom(self, wkbType):
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try:
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if wkbType in (QgsWkbTypes.Point, QgsWkbTypes.MultiPoint,
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QgsWkbTypes.Point25D, QgsWkbTypes.MultiPoint25D):
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return QgsWkbTypes.MultiPoint
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elif wkbType in (QgsWkbTypes.LineString, QgsWkbTypes.MultiLineString,
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QgsWkbTypes.MultiLineString25D,
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QgsWkbTypes.LineString25D):
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return QgsWkbTypes.MultiLineString
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elif wkbType in (QgsWkbTypes.Polygon, QgsWkbTypes.MultiPolygon,
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QgsWkbTypes.MultiPolygon25D, QgsWkbTypes.Polygon25D):
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return QgsWkbTypes.MultiPolygon
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else:
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return QgsWkbTypes.Unknown
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except Exception:
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pass
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def extractAsMulti(self, geom):
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if geom.type() == QgsWkbTypes.PointGeometry:
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if geom.isMultipart():
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return geom.asMultiPoint()
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else:
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return [geom.asPoint()]
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elif geom.type() == QgsWkbTypes.LineGeometry:
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if geom.isMultipart():
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return geom.asMultiPolyline()
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else:
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return [geom.asPolyline()]
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else:
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if geom.isMultipart():
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return geom.asMultiPolygon()
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else:
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return [geom.asPolygon()]
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def convertGeometry(self, geom_list, vType):
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if vType == QgsWkbTypes.PointGeometry:
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return QgsGeometry().fromMultiPoint(geom_list)
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elif vType == QgsWkbTypes.LineGeometry:
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return QgsGeometry().fromMultiPolyline(geom_list)
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else:
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return QgsGeometry().fromMultiPolygon(geom_list)
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