QGIS/python/plugins/processing/algs/qgis/SinglePartsToMultiparts.py
2015-08-22 14:29:41 +02:00

147 lines
5.6 KiB
Python

# -*- coding: utf-8 -*-
"""
***************************************************************************
SinglePartsToMultiparts.py
---------------------
Date : August 2012
Copyright : (C) 2012 by Victor Olaya
Email : volayaf at gmail dot com
***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************
"""
__author__ = 'Victor Olaya'
__date__ = 'August 2012'
__copyright__ = '(C) 2012, Victor Olaya'
# This will get replaced with a git SHA1 when you do a git archive
__revision__ = '$Format:%H$'
from qgis.core import QGis, QgsFeature, QgsGeometry
from processing.core.GeoAlgorithm import GeoAlgorithm
from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
from processing.core.parameters import ParameterVector
from processing.core.parameters import ParameterTableField
from processing.core.outputs import OutputVector
from processing.tools import dataobjects, vector
class SinglePartsToMultiparts(GeoAlgorithm):
INPUT = 'INPUT'
FIELD = 'FIELD'
OUTPUT = 'OUTPUT'
def defineCharacteristics(self):
self.name, self.i18n_name = self.trAlgorithm('Singleparts to multipart')
self.group, self.i18n_group = self.trAlgorithm('Vector geometry tools')
self.addParameter(ParameterVector(self.INPUT, self.tr('Input layer')))
self.addParameter(ParameterTableField(self.FIELD,
self.tr('Unique ID field'), self.INPUT))
self.addOutput(OutputVector(self.OUTPUT, self.tr('Multipart')))
def processAlgorithm(self, progress):
layer = dataobjects.getObjectFromUri(self.getParameterValue(self.INPUT))
fieldName = self.getParameterValue(self.FIELD)
geomType = self.singleToMultiGeom(layer.dataProvider().geometryType())
writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(
layer.pendingFields().toList(), geomType, layer.crs())
inFeat = QgsFeature()
outFeat = QgsFeature()
inGeom = QgsGeometry()
outGeom = QgsGeometry()
index = layer.fieldNameIndex(fieldName)
unique = vector.getUniqueValues(layer, index)
current = 0
features = vector.features(layer)
total = 100.0 / float(len(features) * len(unique))
if not len(unique) == layer.featureCount():
for i in unique:
multi_feature = []
first = True
features = vector.features(layer)
for inFeat in features:
atMap = inFeat.attributes()
idVar = atMap[index]
if unicode(idVar).strip() == unicode(i).strip():
if first:
attrs = atMap
first = False
inGeom = QgsGeometry(inFeat.geometry())
vType = inGeom.type()
feature_list = self.extractAsMulti(inGeom)
multi_feature.extend(feature_list)
current += 1
progress.setPercentage(int(current * total))
outFeat.setAttributes(attrs)
outGeom = QgsGeometry(self.convertGeometry(multi_feature,
vType))
outFeat.setGeometry(outGeom)
writer.addFeature(outFeat)
del writer
else:
raise GeoAlgorithmExecutionException(self.tr('Invalid unique ID field'))
def singleToMultiGeom(self, wkbType):
try:
if wkbType in (QGis.WKBPoint, QGis.WKBMultiPoint,
QGis.WKBPoint25D, QGis.WKBMultiPoint25D):
return QGis.WKBMultiPoint
elif wkbType in (QGis.WKBLineString, QGis.WKBMultiLineString,
QGis.WKBMultiLineString25D,
QGis.WKBLineString25D):
return QGis.WKBMultiLineString
elif wkbType in (QGis.WKBPolygon, QGis.WKBMultiPolygon,
QGis.WKBMultiPolygon25D, QGis.WKBPolygon25D):
return QGis.WKBMultiPolygon
else:
return QGis.WKBUnknown
except Exception as err:
pass
def extractAsMulti(self, geom):
if geom.type() == QGis.Point:
if geom.isMultipart():
return geom.asMultiPoint()
else:
return [geom.asPoint()]
elif geom.type() == QGis.Line:
if geom.isMultipart():
return geom.asMultiPolyline()
else:
return [geom.asPolyline()]
else:
if geom.isMultipart():
return geom.asMultiPolygon()
else:
return [geom.asPolygon()]
def convertGeometry(self, geom_list, vType):
if vType == QGis.Point:
return QgsGeometry().fromMultiPoint(geom_list)
elif vType == QGis.Line:
return QgsGeometry().fromMultiPolyline(geom_list)
else:
return QgsGeometry().fromMultiPolygon(geom_list)