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133 lines
4.8 KiB
Python
133 lines
4.8 KiB
Python
import os.path
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from PyQt4 import QtGui
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from PyQt4.QtCore import *
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from qgis.core import *
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from sextante.core.GeoAlgorithm import GeoAlgorithm
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from sextante.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from sextante.core.QGisLayers import QGisLayers
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from sextante.parameters.ParameterVector import ParameterVector
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from sextante.parameters.ParameterTableField import ParameterTableField
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from sextante.outputs.OutputVector import OutputVector
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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 QtGui.QIcon(os.path.dirname(__file__) + "/icons/single_to_multi.png")
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def defineCharacteristics(self):
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self.name = "Singleparts to multipart"
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self.group = "Geometry tools"
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self.addParameter(ParameterVector(self.INPUT, "Input layer"))
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self.addParameter(ParameterTableField(self.FIELD, "Unique ID field", self.INPUT))
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self.addOutput(OutputVector(self.OUTPUT, "Output layer"))
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def processAlgorithm(self, progress):
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settings = QSettings()
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encoding = settings.value( "/UI/encoding", "System" ).toString()
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layer = QGisLayers.getObjectFromUri(self.getParameterValue(self.INPUT))
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output = self.getOutputValue(self.OUTPUT)
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fieldName = self.getParameterValue(self.FIELD)
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provider = layer.dataProvider()
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allAttrs = layer.pendingAllAttributesList()
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layer.select(allAttrs)
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geomType = self.singleToMultiGeom(provider.geometryType())
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(layer.pendingFields(),
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geomType, provider.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 = layer.uniqueValues(index)
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current = 0
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total = 100.0 / float(provider.featureCount() * len(unique))
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if not len(unique) == layer.featureCount():
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for i in unique:
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provider.rewind()
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multi_feature= []
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first = True
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layer.select(allAttrs)
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while layer.nextFeature(inFeat):
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atMap = inFeat.attributeMap()
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idVar = atMap[index]
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if idVar.toString().trimmed() == i.toString().trimmed():
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if first:
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attrs = atMap
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print attrs
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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.setAttributeMap(attrs)
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outGeom = QgsGeometry(self.convertGeometry(multi_feature, 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("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, 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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print unicode(err)
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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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