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179 lines
7.2 KiB
Python
179 lines
7.2 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,
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QgsGeometry,
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QgsMessageLog,
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QgsProcessingUtils)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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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 dataobjects
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class Dissolve(QgisAlgorithm):
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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 icon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'dissolve.png'))
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def group(self):
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return self.tr('Vector geometry tools')
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def __init__(self):
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super().__init__()
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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 name(self):
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return 'dissolve'
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def displayName(self):
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return self.tr('Dissolve')
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def processAlgorithm(self, parameters, context, 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 = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(Dissolve.INPUT), context)
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writer = self.getOutputFromName(
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Dissolve.OUTPUT).getVectorWriter(vlayerA.fields(), vlayerA.wkbType(), vlayerA.crs(), context)
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outFeat = QgsFeature()
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features = QgsProcessingUtils.getFeatures(vlayerA, context)
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total = 100.0 / QgsProcessingUtils.featureCount(vlayerA, context)
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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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QgsMessageLog.logMessage(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(), self.tr('Processing'), QgsMessageLog.CRITICAL)
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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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QgsMessageLog.logMessage(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(), self.tr('Processing'), QgsMessageLog.CRITICAL)
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if index_attrs not 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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