def processAlgorithm(self, feedback):
inLayer = dataobjects.getObjectFromUri(
self.getParameterValue(self.INPUT))
boundary = self.getParameterValue(self.MODE) == self.MODE_BOUNDARY
smallestArea = self.getParameterValue(
self.MODE) == self.MODE_SMALLEST_AREA
keepSelection = self.getParameterValue(self.KEEPSELECTION)
processLayer = vector.duplicateInMemory(inLayer)
if not keepSelection:
# Make a selection with the values provided
attribute = self.getParameterValue(self.ATTRIBUTE)
comparison = self.comparisons[self.getParameterValue(
self.COMPARISON)]
comparisonvalue = self.getParameterValue(self.COMPARISONVALUE)
selectindex = vector.resolveFieldIndex(processLayer, attribute)
selectType = processLayer.fields()[selectindex].type()
selectionError = False
if selectType in [
QVariant.Int, QVariant.LongLong, QVariant.UInt,
QVariant.ULongLong
]:
try:
y = int(comparisonvalue)
except ValueError:
selectionError = True
msg = self.tr('Cannot convert "%s" to integer' %
str(comparisonvalue))
elif selectType == QVariant.Double:
try:
y = float(comparisonvalue)
except ValueError:
selectionError = True
msg = self.tr('Cannot convert "%s" to float' %
str(comparisonvalue))
elif selectType == QVariant.String:
# 10: string, boolean
try:
y = str(comparisonvalue)
except ValueError:
selectionError = True
msg = self.tr('Cannot convert "%s" to Unicode' %
str(comparisonvalue))
elif selectType == QVariant.Date:
# date
dateAndFormat = comparisonvalue.split(' ')
if len(dateAndFormat) == 1:
# QDate object
y = QLocale.system().toDate(dateAndFormat[0])
if y.isNull():
msg = self.tr(
'Cannot convert "%s" to date with system date format %s'
% (str(dateAndFormat),
QLocale.system().dateFormat()))
elif len(dateAndFormat) == 2:
y = QDate.fromString(dateAndFormat[0], dateAndFormat[1])
if y.isNull():
msg = self.tr(
'Cannot convert "%s" to date with format string "%s"'
% (str(dateAndFormat[0]), dateAndFormat[1]))
else:
y = QDate()
msg = ''
if y.isNull():
# Conversion was unsuccessful
selectionError = True
msg += self.tr(
'Enter the date and the date format, e.g. "07.26.2011" "MM.dd.yyyy".'
)
if (comparison == 'begins with' or comparison == 'contains') \
and selectType != QVariant.String:
selectionError = True
msg = self.tr('"%s" can only be used with string fields' %
comparison)
selected = []
if selectionError:
raise GeoAlgorithmExecutionException(
self.tr('Error in selection input: %s' % msg))
else:
for feature in processLayer.getFeatures():
aValue = feature.attributes()[selectindex]
if aValue is None:
continue
if selectType in [
QVariant.Int, QVariant.LongLong, QVariant.UInt,
QVariant.ULongLong
]:
x = int(aValue)
elif selectType == QVariant.Double:
x = float(aValue)
elif selectType == QVariant.String:
# 10: string, boolean
x = str(aValue)
elif selectType == QVariant.Date:
# date
x = aValue # should be date
match = False
if comparison == '==':
match = x == y
elif comparison == '!=':
match = x != y
elif comparison == '>':
match = x > y
elif comparison == '>=':
match = x >= y
elif comparison == '<':
match = x < y
elif comparison == '<=':
match = x <= y
elif comparison == 'begins with':
match = x.startswith(y)
elif comparison == 'contains':
match = x.find(y) >= 0
if match:
selected.append(feature.id())
processLayer.selectByIds(selected)
if processLayer.selectedFeatureCount() == 0:
ProcessingLog.addToLog(
ProcessingLog.LOG_WARNING,
self.tr('%s: (No selection in input layer "%s")' %
(self.commandLineName(),
self.getParameterValue(self.INPUT))))
# Keep references to the features to eliminate
featToEliminate = []
for aFeat in processLayer.selectedFeatures():
featToEliminate.append(aFeat)
# Delete all features to eliminate in processLayer (we won't save this)
processLayer.startEditing()
processLayer.deleteSelectedFeatures()
# ANALYZE
if len(featToEliminate) > 0: # Prevent zero division
start = 20.00
add = 80.00 / len(featToEliminate)
else:
start = 100
feedback.setProgress(start)
madeProgress = True
# We go through the list and see if we find any polygons we can
# merge the selected with. If we have no success with some we
# merge and then restart the whole story.
while madeProgress: # Check if we made any progress
madeProgress = False
featNotEliminated = []
# Iterate over the polygons to eliminate
for i in range(len(featToEliminate)):
feat = featToEliminate.pop()
geom2Eliminate = feat.geometry()
bbox = geom2Eliminate.boundingBox()
fit = processLayer.getFeatures(
QgsFeatureRequest().setFilterRect(
bbox).setSubsetOfAttributes([]))
mergeWithFid = None
mergeWithGeom = None
max = 0
min = -1
selFeat = QgsFeature()
# use prepared geometries for faster intersection tests
engine = QgsGeometry.createGeometryEngine(
geom2Eliminate.geometry())
engine.prepareGeometry()
while fit.nextFeature(selFeat):
selGeom = selFeat.geometry()
if engine.intersects(selGeom.geometry()):
# We have a candidate
iGeom = geom2Eliminate.intersection(selGeom)
if not iGeom:
continue
if boundary:
selValue = iGeom.length()
else:
# area. We need a common boundary in
# order to merge
if 0 < iGeom.length():
selValue = selGeom.area()
else:
selValue = -1
if -1 != selValue:
useThis = True
if smallestArea:
if -1 == min:
min = selValue
else:
if selValue < min:
min = selValue
else:
useThis = False
else:
if selValue > max:
max = selValue
else:
useThis = False
if useThis:
mergeWithFid = selFeat.id()
mergeWithGeom = QgsGeometry(selGeom)
# End while fit
if mergeWithFid is not None:
# A successful candidate
newGeom = mergeWithGeom.combine(geom2Eliminate)
if processLayer.changeGeometry(mergeWithFid, newGeom):
madeProgress = True
else:
raise GeoAlgorithmExecutionException(
self.
tr('Could not replace geometry of feature with id %s'
% mergeWithFid))
start = start + add
feedback.setProgress(start)
else:
featNotEliminated.append(feat)
# End for featToEliminate
featToEliminate = featNotEliminated
# End while
# Create output
output = self.getOutputFromName(self.OUTPUT)
writer = output.getVectorWriter(processLayer.fields(),
processLayer.wkbType(),
processLayer.crs())
# Write all features that are left over to output layer
iterator = processLayer.getFeatures()
for feature in iterator:
writer.addFeature(feature)
# Leave processLayer untouched
processLayer.rollBack()
for feature in featNotEliminated:
writer.addFeature(feature)
def processAlgorithm(self, feedback):
inLayer = dataobjects.getObjectFromUri(self.getParameterValue(self.INPUT))
boundary = self.getParameterValue(self.MODE) == self.MODE_BOUNDARY
smallestArea = self.getParameterValue(self.MODE) == self.MODE_SMALLEST_AREA
keepSelection = self.getParameterValue(self.KEEPSELECTION)
processLayer = vector.duplicateInMemory(inLayer)
if not keepSelection:
# Make a selection with the values provided
attribute = self.getParameterValue(self.ATTRIBUTE)
comparison = self.comparisons[self.getParameterValue(self.COMPARISON)]
comparisonvalue = self.getParameterValue(self.COMPARISONVALUE)
selectindex = vector.resolveFieldIndex(processLayer, attribute)
selectType = processLayer.fields()[selectindex].type()
selectionError = False
if selectType in [QVariant.Int, QVariant.LongLong, QVariant.UInt, QVariant.ULongLong]:
try:
y = int(comparisonvalue)
except ValueError:
selectionError = True
msg = self.tr('Cannot convert "%s" to integer' % str(comparisonvalue))
elif selectType == QVariant.Double:
try:
y = float(comparisonvalue)
except ValueError:
selectionError = True
msg = self.tr('Cannot convert "%s" to float' % str(comparisonvalue))
elif selectType == QVariant.String:
# 10: string, boolean
try:
y = str(comparisonvalue)
except ValueError:
selectionError = True
msg = self.tr('Cannot convert "%s" to Unicode' % str(comparisonvalue))
elif selectType == QVariant.Date:
# date
dateAndFormat = comparisonvalue.split(' ')
if len(dateAndFormat) == 1:
# QDate object
y = QLocale.system().toDate(dateAndFormat[0])
if y.isNull():
msg = self.tr('Cannot convert "%s" to date with system date format %s' % (str(dateAndFormat), QLocale.system().dateFormat()))
elif len(dateAndFormat) == 2:
y = QDate.fromString(dateAndFormat[0], dateAndFormat[1])
if y.isNull():
msg = self.tr('Cannot convert "%s" to date with format string "%s"' % (str(dateAndFormat[0]), dateAndFormat[1]))
else:
y = QDate()
msg = ''
if y.isNull():
# Conversion was unsuccessful
selectionError = True
msg += self.tr('Enter the date and the date format, e.g. "07.26.2011" "MM.dd.yyyy".')
if (comparison == 'begins with' or comparison == 'contains') \
and selectType != QVariant.String:
selectionError = True
msg = self.tr('"%s" can only be used with string fields' % comparison)
selected = []
if selectionError:
raise GeoAlgorithmExecutionException(
self.tr('Error in selection input: %s' % msg))
else:
for feature in processLayer.getFeatures():
aValue = feature.attributes()[selectindex]
if aValue is None:
continue
if selectType in [QVariant.Int, QVariant.LongLong, QVariant.UInt, QVariant.ULongLong]:
x = int(aValue)
elif selectType == QVariant.Double:
x = float(aValue)
elif selectType == QVariant.String:
# 10: string, boolean
x = str(aValue)
elif selectType == QVariant.Date:
# date
x = aValue # should be date
match = False
if comparison == '==':
match = x == y
elif comparison == '!=':
match = x != y
elif comparison == '>':
match = x > y
elif comparison == '>=':
match = x >= y
elif comparison == '<':
match = x < y
elif comparison == '<=':
match = x <= y
elif comparison == 'begins with':
match = x.startswith(y)
elif comparison == 'contains':
match = x.find(y) >= 0
if match:
selected.append(feature.id())
processLayer.selectByIds(selected)
if processLayer.selectedFeatureCount() == 0:
ProcessingLog.addToLog(ProcessingLog.LOG_WARNING,
self.tr('%s: (No selection in input layer "%s")' % (self.commandLineName(), self.getParameterValue(self.INPUT))))
# Keep references to the features to eliminate
featToEliminate = []
for aFeat in processLayer.selectedFeatures():
featToEliminate.append(aFeat)
# Delete all features to eliminate in processLayer (we won't save this)
processLayer.startEditing()
processLayer.deleteSelectedFeatures()
# ANALYZE
if len(featToEliminate) > 0: # Prevent zero division
start = 20.00
add = 80.00 / len(featToEliminate)
else:
start = 100
feedback.setProgress(start)
madeProgress = True
# We go through the list and see if we find any polygons we can
# merge the selected with. If we have no success with some we
# merge and then restart the whole story.
while madeProgress: # Check if we made any progress
madeProgress = False
featNotEliminated = []
# Iterate over the polygons to eliminate
for i in range(len(featToEliminate)):
feat = featToEliminate.pop()
geom2Eliminate = feat.geometry()
bbox = geom2Eliminate.boundingBox()
fit = processLayer.getFeatures(
QgsFeatureRequest().setFilterRect(bbox).setSubsetOfAttributes([]))
mergeWithFid = None
mergeWithGeom = None
max = 0
min = -1
selFeat = QgsFeature()
# use prepared geometries for faster intersection tests
engine = QgsGeometry.createGeometryEngine(geom2Eliminate.geometry())
engine.prepareGeometry()
while fit.nextFeature(selFeat):
selGeom = selFeat.geometry()
if engine.intersects(selGeom.geometry()):
# We have a candidate
iGeom = geom2Eliminate.intersection(selGeom)
if not iGeom:
continue
if boundary:
selValue = iGeom.length()
else:
# area. We need a common boundary in
# order to merge
if 0 < iGeom.length():
selValue = selGeom.area()
else:
selValue = -1
if -1 != selValue:
useThis = True
if smallestArea:
if -1 == min:
min = selValue
else:
if selValue < min:
min = selValue
else:
useThis = False
else:
if selValue > max:
max = selValue
else:
useThis = False
if useThis:
mergeWithFid = selFeat.id()
mergeWithGeom = QgsGeometry(selGeom)
# End while fit
if mergeWithFid is not None:
# A successful candidate
newGeom = mergeWithGeom.combine(geom2Eliminate)
if processLayer.changeGeometry(mergeWithFid, newGeom):
madeProgress = True
else:
raise GeoAlgorithmExecutionException(
self.tr('Could not replace geometry of feature with id %s' % mergeWithFid))
start = start + add
feedback.setProgress(start)
else:
featNotEliminated.append(feat)
# End for featToEliminate
featToEliminate = featNotEliminated
# End while
# Create output
output = self.getOutputFromName(self.OUTPUT)
writer = output.getVectorWriter(processLayer.fields(),
processLayer.wkbType(), processLayer.crs())
# Write all features that are left over to output layer
iterator = processLayer.getFeatures()
for feature in iterator:
writer.addFeature(feature)
# Leave processLayer untouched
processLayer.rollBack()
for feature in featNotEliminated:
writer.addFeature(feature)
