mirror of
https://github.com/qgis/QGIS.git
synced 2025-03-06 00:05:02 -05:00
06c4b07222
Since the layer has more complete knowledge of the crs (ie, when provider could not determine crs and user has selected it from the list), and also better knowledge of layer fields (virtual fields, joined fields) we should use these rather than the provider methods.
176 lines
7.5 KiB
Python
176 lines
7.5 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
Dissolve.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__ = '$Format:%H$'
|
|
|
|
import os
|
|
from collections import defaultdict
|
|
|
|
from qgis.PyQt.QtGui import QIcon
|
|
|
|
from qgis.core import QgsFeature, QgsGeometry
|
|
|
|
from processing.core.ProcessingLog import ProcessingLog
|
|
from processing.core.GeoAlgorithm import GeoAlgorithm
|
|
from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
|
|
from processing.core.parameters import ParameterVector
|
|
from processing.core.parameters import ParameterBoolean
|
|
from processing.core.parameters import ParameterTableMultipleField
|
|
from processing.core.outputs import OutputVector
|
|
from processing.tools import vector, dataobjects
|
|
|
|
pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
|
|
|
|
|
|
class Dissolve(GeoAlgorithm):
|
|
|
|
INPUT = 'INPUT'
|
|
OUTPUT = 'OUTPUT'
|
|
FIELD = 'FIELD'
|
|
DISSOLVE_ALL = 'DISSOLVE_ALL'
|
|
|
|
def getIcon(self):
|
|
return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'dissolve.png'))
|
|
|
|
def defineCharacteristics(self):
|
|
self.name = 'Dissolve'
|
|
self.group = 'Vector geometry tools'
|
|
self.addParameter(ParameterVector(Dissolve.INPUT,
|
|
self.tr('Input layer'),
|
|
[ParameterVector.VECTOR_TYPE_POLYGON, ParameterVector.VECTOR_TYPE_LINE]))
|
|
self.addParameter(ParameterBoolean(Dissolve.DISSOLVE_ALL,
|
|
self.tr('Dissolve all (do not use fields)'), True))
|
|
self.addParameter(ParameterTableMultipleField(Dissolve.FIELD,
|
|
self.tr('Unique ID fields'), Dissolve.INPUT, optional=True))
|
|
self.addOutput(OutputVector(Dissolve.OUTPUT, self.tr('Dissolved')))
|
|
|
|
def processAlgorithm(self, progress):
|
|
useField = not self.getParameterValue(Dissolve.DISSOLVE_ALL)
|
|
field_names = self.getParameterValue(Dissolve.FIELD)
|
|
vlayerA = dataobjects.getObjectFromUri(
|
|
self.getParameterValue(Dissolve.INPUT))
|
|
|
|
writer = self.getOutputFromName(
|
|
Dissolve.OUTPUT).getVectorWriter(
|
|
vlayerA.fields().toList(),
|
|
vlayerA.wkbType(),
|
|
vlayerA.crs())
|
|
|
|
outFeat = QgsFeature()
|
|
features = vector.features(vlayerA)
|
|
total = 100.0 / len(features)
|
|
|
|
if not useField:
|
|
first = True
|
|
for current, inFeat in enumerate(features):
|
|
progress.setPercentage(int(current * total))
|
|
if first:
|
|
attrs = inFeat.attributes()
|
|
tmpInGeom = inFeat.geometry()
|
|
if tmpInGeom.isEmpty() or tmpInGeom.isGeosEmpty():
|
|
continue
|
|
errors = tmpInGeom.validateGeometry()
|
|
if len(errors) != 0:
|
|
for error in errors:
|
|
ProcessingLog.addToLog(ProcessingLog.LOG_ERROR,
|
|
self.tr('ValidateGeometry()'
|
|
'error: One or more '
|
|
'input features have '
|
|
'invalid geometry: ')
|
|
+ error.what())
|
|
continue
|
|
outFeat.setGeometry(tmpInGeom)
|
|
first = False
|
|
else:
|
|
tmpInGeom = inFeat.geometry()
|
|
if tmpInGeom.isEmpty() or tmpInGeom.isGeosEmpty():
|
|
continue
|
|
tmpOutGeom = outFeat.geometry()
|
|
errors = tmpInGeom.validateGeometry()
|
|
if len(errors) != 0:
|
|
for error in errors:
|
|
ProcessingLog.addToLog(ProcessingLog.LOG_ERROR,
|
|
self.tr('ValidateGeometry()'
|
|
'error:One or more input'
|
|
'features have invalid '
|
|
'geometry: ')
|
|
+ error.what())
|
|
continue
|
|
try:
|
|
tmpOutGeom = QgsGeometry(tmpOutGeom.combine(tmpInGeom))
|
|
outFeat.setGeometry(tmpOutGeom)
|
|
except:
|
|
raise GeoAlgorithmExecutionException(
|
|
self.tr('Geometry exception while dissolving'))
|
|
outFeat.setAttributes(attrs)
|
|
writer.addFeature(outFeat)
|
|
else:
|
|
field_indexes = [vlayerA.fieldNameIndex(f) for f in field_names.split(';')]
|
|
|
|
attribute_dict = {}
|
|
geometry_dict = defaultdict(lambda: [])
|
|
|
|
for inFeat in features:
|
|
attrs = inFeat.attributes()
|
|
|
|
index_attrs = tuple([attrs[i] for i in field_indexes])
|
|
|
|
tmpInGeom = QgsGeometry(inFeat.geometry())
|
|
if tmpInGeom.isGeosEmpty():
|
|
continue
|
|
errors = tmpInGeom.validateGeometry()
|
|
if len(errors) != 0:
|
|
for error in errors:
|
|
ProcessingLog.addToLog(ProcessingLog.LOG_ERROR,
|
|
self.tr('ValidateGeometry() '
|
|
'error: One or more input'
|
|
'features have invalid '
|
|
'geometry: ')
|
|
+ error.what())
|
|
|
|
if not index_attrs in attribute_dict:
|
|
# keep attributes of first feature
|
|
attribute_dict[index_attrs] = attrs
|
|
|
|
geometry_dict[index_attrs].append(tmpInGeom)
|
|
|
|
nFeat = len(attribute_dict)
|
|
|
|
nElement = 0
|
|
for key, value in geometry_dict.items():
|
|
outFeat = QgsFeature()
|
|
nElement += 1
|
|
progress.setPercentage(int(nElement * 100 / nFeat))
|
|
try:
|
|
tmpOutGeom = QgsGeometry.unaryUnion(value)
|
|
except:
|
|
raise GeoAlgorithmExecutionException(
|
|
self.tr('Geometry exception while dissolving'))
|
|
outFeat.setGeometry(tmpOutGeom)
|
|
outFeat.setAttributes(attribute_dict[key])
|
|
writer.addFeature(outFeat)
|
|
|
|
del writer
|