mirror of
https://github.com/qgis/QGIS.git
synced 2025-03-03 00:02:25 -05:00
182 lines
7.1 KiB
Python
182 lines
7.1 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 ParameterTableField
|
|
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 icon(self):
|
|
return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'dissolve.png'))
|
|
|
|
def group(self):
|
|
return self.tr('Vector geometry tools')
|
|
|
|
def name(self):
|
|
return 'Dissolve'
|
|
|
|
def displayName(self):
|
|
return self.tr('Dissolve')
|
|
|
|
def defineCharacteristics(self):
|
|
self.addParameter(ParameterVector(Dissolve.INPUT,
|
|
self.tr('Input layer'),
|
|
[dataobjects.TYPE_VECTOR_POLYGON, dataobjects.TYPE_VECTOR_LINE]))
|
|
self.addParameter(ParameterBoolean(Dissolve.DISSOLVE_ALL,
|
|
self.tr('Dissolve all (do not use fields)'), True))
|
|
self.addParameter(ParameterTableField(Dissolve.FIELD,
|
|
self.tr('Unique ID fields'), Dissolve.INPUT, optional=True, multiple=True))
|
|
self.addOutput(OutputVector(Dissolve.OUTPUT, self.tr('Dissolved')))
|
|
|
|
def processAlgorithm(self, feedback):
|
|
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
|
|
# we dissolve geometries in blocks using unaryUnion
|
|
geom_queue = []
|
|
for current, inFeat in enumerate(features):
|
|
feedback.setProgress(int(current * total))
|
|
if first:
|
|
outFeat.setAttributes(inFeat.attributes())
|
|
first = False
|
|
|
|
tmpInGeom = inFeat.geometry()
|
|
if tmpInGeom.isNull() or tmpInGeom.isEmpty():
|
|
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
|
|
|
|
geom_queue.append(tmpInGeom)
|
|
|
|
if len(geom_queue) > 10000:
|
|
# queue too long, combine it
|
|
try:
|
|
temp_output_geometry = QgsGeometry.unaryUnion(geom_queue)
|
|
geom_queue = [temp_output_geometry]
|
|
except:
|
|
raise GeoAlgorithmExecutionException(
|
|
self.tr('Geometry exception while dissolving'))
|
|
|
|
try:
|
|
outFeat.setGeometry(QgsGeometry.unaryUnion(geom_queue))
|
|
except:
|
|
raise GeoAlgorithmExecutionException(
|
|
self.tr('Geometry exception while dissolving'))
|
|
|
|
writer.addFeature(outFeat)
|
|
else:
|
|
field_indexes = [vlayerA.fields().lookupField(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 and tmpInGeom.isEmpty():
|
|
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 index_attrs not 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 list(geometry_dict.items()):
|
|
outFeat = QgsFeature()
|
|
nElement += 1
|
|
feedback.setProgress(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
|