mirror of
https://github.com/qgis/QGIS.git
synced 2025-10-31 00:06:02 -04:00
144 lines
5.9 KiB
Python
144 lines
5.9 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__ = '$Format:%H$'
|
|
|
|
from qgis.core import QgsFeature, QgsGeometry
|
|
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
|
|
|
|
|
|
class Dissolve(GeoAlgorithm):
|
|
|
|
INPUT = 'INPUT'
|
|
OUTPUT = 'OUTPUT'
|
|
FIELD = 'FIELD'
|
|
DISSOLVE_ALL = 'DISSOLVE_ALL'
|
|
|
|
#==========================================================================
|
|
#def getIcon(self):
|
|
# return QtGui.QIcon(os.path.dirname(__file__) + "/icons/dissolve.png")
|
|
#==========================================================================
|
|
|
|
def processAlgorithm(self, progress):
|
|
useField = not self.getParameterValue(Dissolve.DISSOLVE_ALL)
|
|
fieldname = self.getParameterValue(Dissolve.FIELD)
|
|
vlayerA = dataobjects.getObjectFromUri(
|
|
self.getParameterValue(Dissolve.INPUT))
|
|
vproviderA = vlayerA.dataProvider()
|
|
fields = vlayerA.fields()
|
|
writer = self.getOutputFromName(
|
|
Dissolve.OUTPUT).getVectorWriter(fields,
|
|
vproviderA.geometryType(),
|
|
vproviderA.crs())
|
|
outFeat = QgsFeature()
|
|
nElement = 0
|
|
features = vector.features(vlayerA)
|
|
nFeat = len(features)
|
|
|
|
if not useField:
|
|
first = True
|
|
for inFeat in features:
|
|
nElement += 1
|
|
progress.setPercentage(int(nElement * 100 / nFeat))
|
|
if first:
|
|
attrs = inFeat.attributes()
|
|
tmpInGeom = QgsGeometry(inFeat.geometry())
|
|
outFeat.setGeometry(tmpInGeom)
|
|
first = False
|
|
else:
|
|
tmpInGeom = QgsGeometry(inFeat.geometry())
|
|
tmpOutGeom = QgsGeometry(outFeat.geometry())
|
|
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:
|
|
fieldIdx = vlayerA.fieldNameIndex(fieldname)
|
|
unique = vector.getUniqueValues(vlayerA, int(fieldIdx))
|
|
nFeat = len(unique)
|
|
myDict = {}
|
|
attrDict = {}
|
|
for item in unique:
|
|
myDict[unicode(item).strip()] = []
|
|
attrDict[unicode(item).strip()] = None
|
|
|
|
unique = None
|
|
|
|
for inFeat in features:
|
|
attrs = inFeat.attributes()
|
|
tempItem = attrs[fieldIdx]
|
|
tmpInGeom = QgsGeometry(inFeat.geometry())
|
|
|
|
if attrDict[unicode(tempItem).strip()] == None:
|
|
# keep attributes of first feature
|
|
attrDict[unicode(tempItem).strip()] = attrs
|
|
|
|
myDict[unicode(tempItem).strip()].append(tmpInGeom)
|
|
|
|
features = None
|
|
|
|
for key, value in myDict.items():
|
|
nElement += 1
|
|
progress.setPercentage(int(nElement * 100 / nFeat))
|
|
for i in range(len(value)):
|
|
tmpInGeom = value[i]
|
|
|
|
if i == 0:
|
|
tmpOutGeom = tmpInGeom
|
|
else:
|
|
try:
|
|
tmpOutGeom = QgsGeometry(
|
|
tmpOutGeom.combine(tmpInGeom))
|
|
except:
|
|
raise GeoAlgorithmExecutionException(
|
|
self.tr('Geometry exception while dissolving'))
|
|
outFeat.setGeometry(tmpOutGeom)
|
|
outFeat.setAttributes(attrDict[key])
|
|
writer.addFeature(outFeat)
|
|
|
|
del writer
|
|
|
|
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 field)'), True))
|
|
self.addParameter(ParameterTableField(Dissolve.FIELD,
|
|
self.tr('Unique ID field'), Dissolve.INPUT, optional=True))
|
|
self.addOutput(OutputVector(Dissolve.OUTPUT, self.tr('Dissolved')))
|