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144 lines
5.9 KiB
Python
144 lines
5.9 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Dissolve.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 qgis.core import QgsFeature, QgsGeometry
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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 ParameterBoolean
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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 vector, dataobjects
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class Dissolve(GeoAlgorithm):
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INPUT = 'INPUT'
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OUTPUT = 'OUTPUT'
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FIELD = 'FIELD'
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DISSOLVE_ALL = 'DISSOLVE_ALL'
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#==========================================================================
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#def getIcon(self):
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# return QtGui.QIcon(os.path.dirname(__file__) + "/icons/dissolve.png")
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#==========================================================================
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def processAlgorithm(self, progress):
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useField = not self.getParameterValue(Dissolve.DISSOLVE_ALL)
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fieldname = self.getParameterValue(Dissolve.FIELD)
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vlayerA = dataobjects.getObjectFromUri(
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self.getParameterValue(Dissolve.INPUT))
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vproviderA = vlayerA.dataProvider()
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fields = vlayerA.fields()
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writer = self.getOutputFromName(
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Dissolve.OUTPUT).getVectorWriter(fields,
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vproviderA.geometryType(),
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vproviderA.crs())
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outFeat = QgsFeature()
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nElement = 0
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features = vector.features(vlayerA)
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nFeat = len(features)
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if not useField:
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first = True
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for inFeat in features:
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nElement += 1
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progress.setPercentage(int(nElement * 100 / nFeat))
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if first:
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attrs = inFeat.attributes()
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tmpInGeom = QgsGeometry(inFeat.geometry())
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outFeat.setGeometry(tmpInGeom)
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first = False
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else:
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tmpInGeom = QgsGeometry(inFeat.geometry())
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tmpOutGeom = QgsGeometry(outFeat.geometry())
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try:
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tmpOutGeom = QgsGeometry(tmpOutGeom.combine(tmpInGeom))
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outFeat.setGeometry(tmpOutGeom)
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except:
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raise GeoAlgorithmExecutionException(
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self.tr('Geometry exception while dissolving'))
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outFeat.setAttributes(attrs)
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writer.addFeature(outFeat)
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else:
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fieldIdx = vlayerA.fieldNameIndex(fieldname)
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unique = vector.getUniqueValues(vlayerA, int(fieldIdx))
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nFeat = len(unique)
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myDict = {}
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attrDict = {}
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for item in unique:
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myDict[unicode(item).strip()] = []
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attrDict[unicode(item).strip()] = None
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unique = None
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for inFeat in features:
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attrs = inFeat.attributes()
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tempItem = attrs[fieldIdx]
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tmpInGeom = QgsGeometry(inFeat.geometry())
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if attrDict[unicode(tempItem).strip()] == None:
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# keep attributes of first feature
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attrDict[unicode(tempItem).strip()] = attrs
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myDict[unicode(tempItem).strip()].append(tmpInGeom)
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features = None
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for key, value in myDict.items():
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nElement += 1
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progress.setPercentage(int(nElement * 100 / nFeat))
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for i in range(len(value)):
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tmpInGeom = value[i]
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if i == 0:
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tmpOutGeom = tmpInGeom
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else:
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try:
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tmpOutGeom = QgsGeometry(
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tmpOutGeom.combine(tmpInGeom))
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except:
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raise GeoAlgorithmExecutionException(
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self.tr('Geometry exception while dissolving'))
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outFeat.setGeometry(tmpOutGeom)
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outFeat.setAttributes(attrDict[key])
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writer.addFeature(outFeat)
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del writer
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def defineCharacteristics(self):
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self.name = 'Dissolve'
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self.group = 'Vector geometry tools'
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self.addParameter(ParameterVector(Dissolve.INPUT,
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self.tr('Input layer'),
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[ParameterVector.VECTOR_TYPE_POLYGON, ParameterVector.VECTOR_TYPE_LINE]))
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self.addParameter(ParameterBoolean(Dissolve.DISSOLVE_ALL,
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self.tr('Dissolve all (do not use field)'), True))
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self.addParameter(ParameterTableField(Dissolve.FIELD,
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self.tr('Unique ID field'), Dissolve.INPUT, optional=True))
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self.addOutput(OutputVector(Dissolve.OUTPUT, self.tr('Dissolved')))
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