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151 lines
5.5 KiB
Python
151 lines
5.5 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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__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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from PyQt4.QtCore import *
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from qgis.core import *
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.GeoAlgorithmExecutionException import \
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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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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 defineCharacteristics(self):
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self.name = 'Singleparts to multipart'
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self.group = '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('Output layer')))
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def processAlgorithm(self, progress):
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layer = dataobjects.getObjectFromUri(
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self.getParameterValue(self.INPUT))
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fieldName = self.getParameterValue(self.FIELD)
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geomType = self.singleToMultiGeom(layer.dataProvider().geometryType())
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writer = self.getOutputFromName(
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self.OUTPUT).getVectorWriter(layer.pendingFields().toList(),
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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.fieldNameIndex(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 / float(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 unicode(idVar).strip() == unicode(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 = QgsGeometry(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(self.tr('Invalid unique ID field'))
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def singleToMultiGeom(self, wkbType):
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try:
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if wkbType in (QGis.WKBPoint, QGis.WKBMultiPoint,
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QGis.WKBPoint25D, QGis.WKBMultiPoint25D):
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return QGis.WKBMultiPoint
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elif wkbType in (QGis.WKBLineString, QGis.WKBMultiLineString,
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QGis.WKBMultiLineString25D,
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QGis.WKBLineString25D):
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return QGis.WKBMultiLineString
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elif wkbType in (QGis.WKBPolygon, QGis.WKBMultiPolygon,
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QGis.WKBMultiPolygon25D, QGis.WKBPolygon25D):
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return QGis.WKBMultiPolygon
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else:
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return QGis.WKBUnknown
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except Exception, err:
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pass
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def extractAsMulti(self, geom):
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if geom.type() == QGis.Point:
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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() == QGis.Line:
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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 == QGis.Point:
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return QgsGeometry().fromMultiPoint(geom_list)
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elif vType == QGis.Line:
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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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