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af0d68b882
Faster than QgsGeometry::isGeosEmpty() because it avoids the conversion to GEOS geometries and just uses the QgsAbstractGeometry subclasses directly. Also implements faster isEmpty() overrides for specific QgsAbstractGeometry subclasses.
175 lines
7.0 KiB
Python
175 lines
7.0 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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import os
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from collections import defaultdict
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from qgis.PyQt.QtGui import QIcon
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from qgis.core import QgsFeature, QgsGeometry
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from processing.core.ProcessingLog import ProcessingLog
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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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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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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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def getIcon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'dissolve.png'))
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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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[dataobjects.TYPE_VECTOR_POLYGON, dataobjects.TYPE_VECTOR_LINE]))
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self.addParameter(ParameterBoolean(Dissolve.DISSOLVE_ALL,
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self.tr('Dissolve all (do not use fields)'), True))
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self.addParameter(ParameterTableField(Dissolve.FIELD,
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self.tr('Unique ID fields'), Dissolve.INPUT, optional=True, multiple=True))
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self.addOutput(OutputVector(Dissolve.OUTPUT, self.tr('Dissolved')))
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def processAlgorithm(self, feedback):
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useField = not self.getParameterValue(Dissolve.DISSOLVE_ALL)
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field_names = self.getParameterValue(Dissolve.FIELD)
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vlayerA = dataobjects.getObjectFromUri(
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self.getParameterValue(Dissolve.INPUT))
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writer = self.getOutputFromName(
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Dissolve.OUTPUT).getVectorWriter(
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vlayerA.fields().toList(),
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vlayerA.wkbType(),
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vlayerA.crs())
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outFeat = QgsFeature()
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features = vector.features(vlayerA)
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total = 100.0 / len(features)
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if not useField:
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first = True
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# we dissolve geometries in blocks using unaryUnion
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geom_queue = []
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for current, inFeat in enumerate(features):
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feedback.setProgress(int(current * total))
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if first:
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outFeat.setAttributes(inFeat.attributes())
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first = False
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tmpInGeom = inFeat.geometry()
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if tmpInGeom.isNull() or tmpInGeom.isEmpty():
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continue
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errors = tmpInGeom.validateGeometry()
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if len(errors) != 0:
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for error in errors:
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ProcessingLog.addToLog(ProcessingLog.LOG_ERROR,
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self.tr('ValidateGeometry()'
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'error: One or more '
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'input features have '
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'invalid geometry: ')
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+ error.what())
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continue
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geom_queue.append(tmpInGeom)
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if len(geom_queue) > 10000:
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# queue too long, combine it
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try:
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temp_output_geometry = QgsGeometry.unaryUnion(geom_queue)
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geom_queue = [temp_output_geometry]
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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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try:
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outFeat.setGeometry(QgsGeometry.unaryUnion(geom_queue))
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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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writer.addFeature(outFeat)
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else:
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field_indexes = [vlayerA.fields().lookupField(f) for f in field_names.split(';')]
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attribute_dict = {}
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geometry_dict = defaultdict(lambda: [])
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for inFeat in features:
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attrs = inFeat.attributes()
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index_attrs = tuple([attrs[i] for i in field_indexes])
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tmpInGeom = QgsGeometry(inFeat.geometry())
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if tmpInGeom and tmpInGeom.isEmpty():
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continue
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errors = tmpInGeom.validateGeometry()
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if len(errors) != 0:
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for error in errors:
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ProcessingLog.addToLog(ProcessingLog.LOG_ERROR,
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self.tr('ValidateGeometry() '
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'error: One or more input'
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'features have invalid '
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'geometry: ')
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+ error.what())
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if not index_attrs in attribute_dict:
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# keep attributes of first feature
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attribute_dict[index_attrs] = attrs
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geometry_dict[index_attrs].append(tmpInGeom)
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nFeat = len(attribute_dict)
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nElement = 0
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for key, value in list(geometry_dict.items()):
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outFeat = QgsFeature()
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nElement += 1
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feedback.setProgress(int(nElement * 100 / nFeat))
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try:
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tmpOutGeom = QgsGeometry.unaryUnion(value)
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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(attribute_dict[key])
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writer.addFeature(outFeat)
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del writer
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