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131 lines
4.7 KiB
Python
131 lines
4.7 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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MultipartToSingleparts.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.outputs import OutputVector
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from processing.tools import dataobjects, vector
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class MultipartToSingleparts(GeoAlgorithm):
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INPUT = 'INPUT'
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OUTPUT = 'OUTPUT'
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# =========================================================================
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# def getIcon(self):
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# return QIcon(os.path.dirname(__file__) + "/icons/multi_to_single.png")
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# =========================================================================
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def defineCharacteristics(self):
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self.name = 'Multipart to singleparts'
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self.group = 'Vector geometry tools'
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self.addParameter(ParameterVector(self.INPUT, 'Input layer'))
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self.addOutput(OutputVector(self.OUTPUT, '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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geomType = self.multiToSingleGeom(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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outFeat = QgsFeature()
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inGeom = QgsGeometry()
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current = 0
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features = vector.features(layer)
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total = 100.0 / float(len(features))
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for f in features:
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inGeom = f.geometry()
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attrs = f.attributes()
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geometries = self.extractAsSingle(inGeom)
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outFeat.setAttributes(attrs)
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for g in geometries:
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outFeat.setGeometry(g)
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writer.addFeature(outFeat)
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current += 1
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progress.setPercentage(int(current * total))
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del writer
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def multiToSingleGeom(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.WKBPoint
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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.WKBLineString
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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.WKBPolygon
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else:
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return QGis.WKBUnknown
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except Exception, err:
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raise GeoAlgorithmExecutionException(unicode(err))
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def extractAsSingle(self, geom):
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multiGeom = QgsGeometry()
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geometries = []
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if geom.type() == QGis.Point:
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if geom.isMultipart():
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multiGeom = geom.asMultiPoint()
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for i in multiGeom:
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geometries.append(QgsGeometry().fromPoint(i))
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else:
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geometries.append(geom)
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elif geom.type() == QGis.Line:
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if geom.isMultipart():
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multiGeom = geom.asMultiPolyline()
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for i in multiGeom:
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geometries.append(QgsGeometry().fromPolyline(i))
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else:
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geometries.append(geom)
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elif geom.type() == QGis.Polygon:
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if geom.isMultipart():
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multiGeom = geom.asMultiPolygon()
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for i in multiGeom:
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geometries.append(QgsGeometry().fromPolygon(i))
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else:
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geometries.append(geom)
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return geometries
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