本文整理汇总了Python中qgis.core.QgsGeometry.asGeometryCollection方法的典型用法代码示例。如果您正苦于以下问题：Python QgsGeometry.asGeometryCollection方法的具体用法？Python QgsGeometry.asGeometryCollection怎么用？Python QgsGeometry.asGeometryCollection使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类qgis.core.QgsGeometry的用法示例。
在下文中一共展示了QgsGeometry.asGeometryCollection方法的8个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: convertToLineStrings
# 需要导入模块: from qgis.core import QgsGeometry [as 别名]
# 或者: from qgis.core.QgsGeometry import asGeometryCollection [as 别名]
def convertToLineStrings(self, geom):
if QgsWkbTypes.geometryType(geom.wkbType()) == QgsWkbTypes.PointGeometry:
raise QgsProcessingException(
self.tr('Cannot convert from {0} to LineStrings').format(QgsWkbTypes.displayString(geom.wkbType())))
elif QgsWkbTypes.geometryType(geom.wkbType()) == QgsWkbTypes.LineGeometry:
if QgsWkbTypes.isMultiType(geom.wkbType()):
return geom.asGeometryCollection()
else:
#line to line
return [geom]
else:
# polygons to lines
# we just use the boundary here - that consists of all rings in the (multi)polygon
boundary = QgsGeometry(geom.constGet().boundary())
# boundary will be multipart
return boundary.asGeometryCollection()示例2: processAlgorithm
# 需要导入模块: from qgis.core import QgsGeometry [as 别名]
# 或者: from qgis.core.QgsGeometry import asGeometryCollection [as 别名]
def processAlgorithm(self, parameters, context, feedback):
sourceA = self.parameterAsSource(parameters, self.INPUT, context)
sourceB = self.parameterAsSource(parameters, self.OVERLAY, context)
geomType = QgsWkbTypes.multiType(sourceA.wkbType())
fields = vector.combineFields(sourceA.fields(), sourceB.fields())
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
fields, geomType, sourceA.sourceCrs())
featA = QgsFeature()
featB = QgsFeature()
outFeat = QgsFeature()
indexA = QgsSpatialIndex(sourceA, feedback)
indexB = QgsSpatialIndex(sourceB.getFeatures(QgsFeatureRequest().setSubsetOfAttributes([]).setDestinationCrs(sourceA.sourceCrs())), feedback)
total = 100.0 / (sourceA.featureCount() * sourceB.featureCount()) if sourceA.featureCount() and sourceB.featureCount() else 1
count = 0
for featA in sourceA.getFeatures():
if feedback.isCanceled():
break
lstIntersectingB = []
geom = featA.geometry()
atMapA = featA.attributes()
intersects = indexB.intersects(geom.boundingBox())
if len(intersects) < 1:
try:
outFeat.setGeometry(geom)
outFeat.setAttributes(atMapA)
sink.addFeature(outFeat, QgsFeatureSink.FastInsert)
except:
# This really shouldn't happen, as we haven't
# edited the input geom at all
feedback.pushInfo(self.tr('Feature geometry error: One or more output features ignored due to invalid geometry.'))
else:
request = QgsFeatureRequest().setFilterFids(intersects).setSubsetOfAttributes([])
request.setDestinationCrs(sourceA.sourceCrs())
engine = QgsGeometry.createGeometryEngine(geom.geometry())
engine.prepareGeometry()
for featB in sourceB.getFeatures(request):
atMapB = featB.attributes()
tmpGeom = featB.geometry()
if engine.intersects(tmpGeom.geometry()):
int_geom = geom.intersection(tmpGeom)
lstIntersectingB.append(tmpGeom)
if not int_geom:
# There was a problem creating the intersection
feedback.pushInfo(self.tr('Feature geometry error: One or more output features ignored due to invalid geometry.'))
int_geom = QgsGeometry()
else:
int_geom = QgsGeometry(int_geom)
if int_geom.wkbType() == QgsWkbTypes.Unknown or QgsWkbTypes.flatType(int_geom.geometry().wkbType()) == QgsWkbTypes.GeometryCollection:
# Intersection produced different geomety types
temp_list = int_geom.asGeometryCollection()
for i in temp_list:
if i.type() == geom.type():
int_geom = QgsGeometry(i)
try:
outFeat.setGeometry(int_geom)
outFeat.setAttributes(atMapA + atMapB)
sink.addFeature(outFeat, QgsFeatureSink.FastInsert)
except:
feedback.pushInfo(self.tr('Feature geometry error: One or more output features ignored due to invalid geometry.'))
else:
# Geometry list: prevents writing error
# in geometries of different types
# produced by the intersection
# fix #3549
if int_geom.wkbType() in wkbTypeGroups[wkbTypeGroups[int_geom.wkbType()]]:
try:
outFeat.setGeometry(int_geom)
outFeat.setAttributes(atMapA + atMapB)
sink.addFeature(outFeat, QgsFeatureSink.FastInsert)
except:
feedback.pushInfo(self.tr('Feature geometry error: One or more output features ignored due to invalid geometry.'))
# the remaining bit of featA's geometry
# if there is nothing left, this will just silently fail and we're good
diff_geom = QgsGeometry(geom)
if len(lstIntersectingB) != 0:
intB = QgsGeometry.unaryUnion(lstIntersectingB)
diff_geom = diff_geom.difference(intB)
if diff_geom.wkbType() == QgsWkbTypes.Unknown or QgsWkbTypes.flatType(diff_geom.geometry().wkbType()) == QgsWkbTypes.GeometryCollection:
temp_list = diff_geom.asGeometryCollection()
for i in temp_list:
if i.type() == geom.type():
diff_geom = QgsGeometry(i)
try:
outFeat.setGeometry(diff_geom)
outFeat.setAttributes(atMapA)
sink.addFeature(outFeat, QgsFeatureSink.FastInsert)
#.........这里部分代码省略.........
示例3: processAlgorithm
# 需要导入模块: from qgis.core import QgsGeometry [as 别名]
# 或者: from qgis.core.QgsGeometry import asGeometryCollection [as 别名]
def processAlgorithm(self, progress):
vlayerA = dataobjects.getObjectFromUri(self.getParameterValue(Union.INPUT))
vlayerB = dataobjects.getObjectFromUri(self.getParameterValue(Union.INPUT2))
geomType = vlayerA.wkbType()
fields = vector.combineVectorFields(vlayerA, vlayerB)
writer = self.getOutputFromName(Union.OUTPUT).getVectorWriter(fields, geomType, vlayerA.crs())
inFeatA = QgsFeature()
inFeatB = QgsFeature()
outFeat = QgsFeature()
indexA = vector.spatialindex(vlayerB)
indexB = vector.spatialindex(vlayerA)
count = 0
nElement = 0
featuresA = vector.features(vlayerA)
nFeat = len(featuresA)
for inFeatA in featuresA:
progress.setPercentage(nElement / float(nFeat) * 50)
nElement += 1
lstIntersectingB = []
geom = inFeatA.geometry()
atMapA = inFeatA.attributes()
intersects = indexA.intersects(geom.boundingBox())
if len(intersects) < 1:
try:
outFeat.setGeometry(geom)
outFeat.setAttributes(atMapA)
writer.addFeature(outFeat)
except:
# This really shouldn't happen, as we haven't
# edited the input geom at all
ProcessingLog.addToLog(
ProcessingLog.LOG_INFO,
self.tr("Feature geometry error: One or more output features ignored due to invalid geometry."),
)
else:
request = QgsFeatureRequest().setFilterFids(intersects)
engine = QgsGeometry.createGeometryEngine(geom.geometry())
engine.prepareGeometry()
for inFeatB in vlayerB.getFeatures(request):
count += 1
atMapB = inFeatB.attributes()
tmpGeom = inFeatB.geometry()
if engine.intersects(tmpGeom.geometry()):
int_geom = geom.intersection(tmpGeom)
lstIntersectingB.append(tmpGeom)
if not int_geom:
# There was a problem creating the intersection
ProcessingLog.addToLog(
ProcessingLog.LOG_INFO,
self.tr("GEOS geoprocessing error: One or more input features have invalid geometry."),
)
int_geom = QgsGeometry()
else:
int_geom = QgsGeometry(int_geom)
if (
int_geom.wkbType() == QgsWkbTypes.Unknown
or QgsWkbTypes.flatType(int_geom.geometry().wkbType()) == QgsWkbTypes.GeometryCollection
):
# Intersection produced different geomety types
temp_list = int_geom.asGeometryCollection()
for i in temp_list:
if i.type() == geom.type():
int_geom = QgsGeometry(i)
try:
outFeat.setGeometry(int_geom)
outFeat.setAttributes(atMapA + atMapB)
writer.addFeature(outFeat)
except:
ProcessingLog.addToLog(
ProcessingLog.LOG_INFO,
self.tr(
"Feature geometry error: One or more output features ignored due to invalid geometry."
),
)
else:
# Geometry list: prevents writing error
# in geometries of different types
# produced by the intersection
# fix #3549
if int_geom.wkbType() in wkbTypeGroups[wkbTypeGroups[int_geom.wkbType()]]:
try:
outFeat.setGeometry(int_geom)
outFeat.setAttributes(atMapA + atMapB)
writer.addFeature(outFeat)
except:
ProcessingLog.addToLog(
ProcessingLog.LOG_INFO,
self.tr(
"Feature geometry error: One or more output features ignored due to invalid geometry."
),
)
#.........这里部分代码省略.........
示例4: union
# 需要导入模块: from qgis.core import QgsGeometry [as 别名]
# 或者: from qgis.core.QgsGeometry import asGeometryCollection [as 别名]
#.........这里部分代码省略.........
tr('Feature geometry error: One or more output features '
'ignored due to invalid geometry.'))
else:
request = QgsFeatureRequest().setFilterFids(intersects)
engine = QgsGeometry.createGeometryEngine(geom.geometry())
engine.prepareGeometry()
for in_feat_b in union_b.getFeatures(request):
count += 1
at_map_b = in_feat_b.attributes()
tmp_geom = geometry_checker(in_feat_b.geometry())
if engine.intersects(tmp_geom.geometry()):
int_geom = geometry_checker(geom.intersection(tmp_geom))
list_intersecting_b.append(QgsGeometry(tmp_geom))
if not int_geom:
# There was a problem creating the intersection
# LOGGER.debug(
# tr('GEOS geoprocessing error: One or more input '
# 'features have invalid geometry.'))
pass
int_geom = QgsGeometry()
else:
int_geom = QgsGeometry(int_geom)
if int_geom.wkbType() == QgsWKBTypes.Unknown\
or QgsWKBTypes.flatType(
int_geom.geometry().wkbType()) == \
QgsWKBTypes.GeometryCollection:
# Intersection produced different geometry types
temp_list = int_geom.asGeometryCollection()
for i in temp_list:
if i.type() == geom.type():
int_geom = QgsGeometry(geometry_checker(i))
try:
_write_feature(
at_map_a + at_map_b,
int_geom,
writer,
not_null_field_index,
)
except:
LOGGER.debug(
tr('Feature geometry error: One or '
'more output features ignored due '
'to invalid geometry.'))
else:
# Geometry list: prevents writing error
# in geometries of different types
# produced by the intersection
# fix #3549
if int_geom.wkbType() in wkb_type_groups[
wkb_type_groups[int_geom.wkbType()]]:
try:
_write_feature(
at_map_a + at_map_b,
int_geom,
writer,
not_null_field_index)
except:
LOGGER.debug(
tr('Feature geometry error: One or more '
'output features ignored due to '示例5: processAlgorithm
# 需要导入模块: from qgis.core import QgsGeometry [as 别名]
# 或者: from qgis.core.QgsGeometry import asGeometryCollection [as 别名]
def processAlgorithm(self, progress):
vlayerA = dataobjects.getObjectFromUri(self.getParameterValue(Union.INPUT))
vlayerB = dataobjects.getObjectFromUri(self.getParameterValue(Union.INPUT2))
GEOS_EXCEPT = True
FEATURE_EXCEPT = True
vproviderA = vlayerA.dataProvider()
fields = vector.combineVectorFields(vlayerA, vlayerB)
names = [field.name() for field in fields]
ProcessingLog.addToLog(ProcessingLog.LOG_INFO, str(names))
writer = self.getOutputFromName(Union.OUTPUT).getVectorWriter(
fields, vproviderA.geometryType(), vproviderA.crs()
)
inFeatA = QgsFeature()
inFeatB = QgsFeature()
outFeat = QgsFeature()
indexA = vector.spatialindex(vlayerB)
indexB = vector.spatialindex(vlayerA)
count = 0
nElement = 0
featuresA = vector.features(vlayerA)
nFeat = len(featuresA)
for inFeatA in featuresA:
progress.setPercentage(nElement / float(nFeat) * 50)
nElement += 1
found = False
geom = QgsGeometry(inFeatA.geometry())
diff_geom = QgsGeometry(geom)
atMapA = inFeatA.attributes()
intersects = indexA.intersects(geom.boundingBox())
if len(intersects) < 1:
try:
outFeat.setGeometry(geom)
outFeat.setAttributes(atMapA)
writer.addFeature(outFeat)
except:
# This really shouldn't happen, as we haven't
# edited the input geom at all
raise GeoAlgorithmExecutionException(self.tr("Feature exception while computing union"))
else:
for id in intersects:
count += 1
request = QgsFeatureRequest().setFilterFid(id)
inFeatB = vlayerB.getFeatures(request).next()
atMapB = inFeatB.attributes()
tmpGeom = QgsGeometry(inFeatB.geometry())
if geom.intersects(tmpGeom):
found = True
int_geom = geom.intersection(tmpGeom)
if int_geom is None:
# There was a problem creating the intersection
raise GeoAlgorithmExecutionException(
self.tr("Geometry exception while computing " "intersection")
)
else:
int_geom = QgsGeometry(int_geom)
if diff_geom.intersects(tmpGeom):
diff_geom = diff_geom.difference(tmpGeom)
if diff_geom is None:
# It's possible there was an error here?
diff_geom = QgsGeometry()
else:
diff_geom = QgsGeometry(diff_geom)
if int_geom.wkbType() == 0:
# Intersection produced different geomety types
temp_list = int_geom.asGeometryCollection()
for i in temp_list:
if i.type() == geom.type():
int_geom = QgsGeometry(i)
try:
outFeat.setGeometry(int_geom)
attrs = []
attrs.extend(atMapA)
attrs.extend(atMapB)
outFeat.setAttributes(attrs)
writer.addFeature(outFeat)
except Exception, err:
raise GeoAlgorithmExecutionException(self.tr("Feature exception while computing union"))
else:
# This only happends if the bounding box intersects,
# but the geometry doesn't
try:
outFeat.setGeometry(geom)
outFeat.setAttributes(atMapA)
writer.addFeature(outFeat)
except:
# Also shoudn't ever happen
raise GeoAlgorithmExecutionException(self.tr("Feature exception while computing union"))
if found:
try:
if diff_geom.wkbType() == 0:
temp_list = diff_geom.asGeometryCollection()
for i in temp_list:
if i.type() == geom.type():
#.........这里部分代码省略.........
示例6: processAlgorithm
# 需要导入模块: from qgis.core import QgsGeometry [as 别名]
# 或者: from qgis.core.QgsGeometry import asGeometryCollection [as 别名]
def processAlgorithm(self, parameters, context, feedback):
vlayerA = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(Union.INPUT), context)
vlayerB = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(Union.INPUT2), context)
geomType = vlayerA.wkbType()
fields = vector.combineFields(vlayerA.fields(), vlayerB.fields())
writer = self.getOutputFromName(Union.OUTPUT).getVectorWriter(fields, geomType, vlayerA.crs(), context)
inFeatA = QgsFeature()
inFeatB = QgsFeature()
outFeat = QgsFeature()
indexA = QgsProcessingUtils.createSpatialIndex(vlayerB, context)
indexB = QgsProcessingUtils.createSpatialIndex(vlayerA, context)
count = 0
nElement = 0
featuresA = QgsProcessingUtils.getFeatures(vlayerA, context)
nFeat = QgsProcessingUtils.featureCount(vlayerA, context)
for inFeatA in featuresA:
feedback.setProgress(nElement / float(nFeat) * 50)
nElement += 1
lstIntersectingB = []
geom = inFeatA.geometry()
atMapA = inFeatA.attributes()
intersects = indexA.intersects(geom.boundingBox())
if len(intersects) < 1:
try:
outFeat.setGeometry(geom)
outFeat.setAttributes(atMapA)
writer.addFeature(outFeat, QgsFeatureSink.FastInsert)
except:
# This really shouldn't happen, as we haven't
# edited the input geom at all
QgsMessageLog.logMessage(self.tr('Feature geometry error: One or more output features ignored due to invalid geometry.'),
self.tr('Processing'), QgsMessageLog.INFO)
else:
request = QgsFeatureRequest().setFilterFids(intersects)
engine = QgsGeometry.createGeometryEngine(geom.geometry())
engine.prepareGeometry()
for inFeatB in vlayerB.getFeatures(request):
count += 1
atMapB = inFeatB.attributes()
tmpGeom = inFeatB.geometry()
if engine.intersects(tmpGeom.geometry()):
int_geom = geom.intersection(tmpGeom)
lstIntersectingB.append(tmpGeom)
if not int_geom:
# There was a problem creating the intersection
QgsMessageLog.logMessage(self.tr('GEOS geoprocessing error: One or more input features have invalid geometry.'),
self.tr('Processing'), QgsMessageLog.INFO)
int_geom = QgsGeometry()
else:
int_geom = QgsGeometry(int_geom)
if int_geom.wkbType() == QgsWkbTypes.Unknown or QgsWkbTypes.flatType(int_geom.geometry().wkbType()) == QgsWkbTypes.GeometryCollection:
# Intersection produced different geomety types
temp_list = int_geom.asGeometryCollection()
for i in temp_list:
if i.type() == geom.type():
int_geom = QgsGeometry(i)
try:
outFeat.setGeometry(int_geom)
outFeat.setAttributes(atMapA + atMapB)
writer.addFeature(outFeat, QgsFeatureSink.FastInsert)
except:
QgsMessageLog.logMessage(self.tr('Feature geometry error: One or more output features ignored due to invalid geometry.'),
self.tr('Processing'), QgsMessageLog.INFO)
else:
# Geometry list: prevents writing error
# in geometries of different types
# produced by the intersection
# fix #3549
if int_geom.wkbType() in wkbTypeGroups[wkbTypeGroups[int_geom.wkbType()]]:
try:
outFeat.setGeometry(int_geom)
outFeat.setAttributes(atMapA + atMapB)
writer.addFeature(outFeat, QgsFeatureSink.FastInsert)
except:
QgsMessageLog.logMessage(self.tr('Feature geometry error: One or more output features ignored due to invalid geometry.'),
self.tr('Processing'), QgsMessageLog.INFO)
# the remaining bit of inFeatA's geometry
# if there is nothing left, this will just silently fail and we're good
diff_geom = QgsGeometry(geom)
if len(lstIntersectingB) != 0:
intB = QgsGeometry.unaryUnion(lstIntersectingB)
diff_geom = diff_geom.difference(intB)
if diff_geom.wkbType() == 0 or QgsWkbTypes.flatType(diff_geom.geometry().wkbType()) == QgsWkbTypes.GeometryCollection:
temp_list = diff_geom.asGeometryCollection()
for i in temp_list:
if i.type() == geom.type():
diff_geom = QgsGeometry(i)
try:
outFeat.setGeometry(diff_geom)
outFeat.setAttributes(atMapA)
#.........这里部分代码省略.........
示例7: processAlgorithm
# 需要导入模块: from qgis.core import QgsGeometry [as 别名]
# 或者: from qgis.core.QgsGeometry import asGeometryCollection [as 别名]
def processAlgorithm(self, progress):
vlayerA = dataobjects.getObjectFromUri(self.getParameterValue(Union.INPUT))
vlayerB = dataobjects.getObjectFromUri(self.getParameterValue(Union.INPUT2))
geomType = vlayerA.wkbType()
fields = vector.combineVectorFields(vlayerA, vlayerB)
writer = self.getOutputFromName(Union.OUTPUT).getVectorWriter(fields,
geomType,
vlayerA.crs())
inFeatA = QgsFeature()
inFeatB = QgsFeature()
outFeat = QgsFeature()
indexA = vector.spatialindex(vlayerB)
indexB = vector.spatialindex(vlayerA)
count = 0
nElement = 0
featuresA = vector.features(vlayerA)
nFeat = len(featuresA) if len(featuresA) > 0 else 1
for inFeatA in featuresA:
progress.setPercentage(nElement / float(nFeat) * 50)
nElement += 1
lstIntersectingB = []
geom = QgsGeometry(inFeatA.geometry())
atMapA = inFeatA.attributes()
intersects = indexA.intersects(geom.boundingBox())
if len(intersects) < 1:
try:
outFeat.setGeometry(geom)
outFeat.setAttributes(atMapA)
writer.addFeature(outFeat)
except:
# This really shouldn't happen, as we haven't
# edited the input geom at all
ProcessingLog.addToLog(ProcessingLog.LOG_INFO,
self.tr('Feature geometry error: One or more output features ignored due to invalid geometry.'))
else:
for id in intersects:
count += 1
request = QgsFeatureRequest().setFilterFid(id)
inFeatB = vlayerB.getFeatures(request).next()
atMapB = inFeatB.attributes()
tmpGeom = QgsGeometry(inFeatB.geometry())
if geom.intersects(tmpGeom):
int_geom = geom.intersection(tmpGeom)
lstIntersectingB.append(tmpGeom)
if int_geom is None:
# There was a problem creating the intersection
ProcessingLog.addToLog(ProcessingLog.LOG_INFO,
self.tr('GEOS geoprocessing error: One or more input features have invalid geometry.'))
int_geom = QgsGeometry()
else:
int_geom = QgsGeometry(int_geom)
# TODO: the result may have a different dimension (e.g. intersection of two polygons may result in a single point)
# or the result may be a collection of geometries (e.g. intersection of two polygons results in three polygons and one linestring).
# We need to filter out all acceptable geometries into a single (possibly multi-part) geometry - and we need
# to do it consistently also in the code further below
if int_geom.wkbType() == QGis.WKBUnknown or QgsWKBTypes.flatType(int_geom.geometry().wkbType()) == QgsWKBTypes.GeometryCollection:
# Intersection produced different geomety types
temp_list = int_geom.asGeometryCollection()
for i in temp_list:
if i.type() == geom.type():
int_geom = QgsGeometry(i)
try:
outFeat.setGeometry(int_geom)
outFeat.setAttributes(atMapA + atMapB)
writer.addFeature(outFeat)
except:
ProcessingLog.addToLog(ProcessingLog.LOG_INFO,
self.tr('Feature geometry error: One or more output features ignored due to invalid geometry.'))
else:
# Geometry list: prevents writing error
# in geometries of different types
# produced by the intersection
# fix #3549
if int_geom.wkbType() in wkbTypeGroups[wkbTypeGroups[int_geom.wkbType()]]:
try:
outFeat.setGeometry(int_geom)
outFeat.setAttributes(atMapA + atMapB)
writer.addFeature(outFeat)
except:
ProcessingLog.addToLog(ProcessingLog.LOG_INFO,
self.tr('Feature geometry error: One or more output features ignored due to invalid geometry.'))
# the remaining bit of inFeatA's geometry
# if there is nothing left, this will just silently fail and we're good
diff_geom = QgsGeometry(geom)
if len(lstIntersectingB) != 0:
intB = QgsGeometry.unaryUnion(lstIntersectingB)
diff_geom = diff_geom.difference(intB)
if diff_geom is None:
ProcessingLog.addToLog(ProcessingLog.LOG_INFO,
self.tr('GEOS geoprocessing error: One or more input features have invalid geometry.'))
diff_geom = QgsGeometry()
if diff_geom.isGeosEmpty() or not diff_geom.isGeosValid():
ProcessingLog.addToLog(ProcessingLog.LOG_ERROR,
#.........这里部分代码省略.........
示例8: processAlgorithm
# 需要导入模块: from qgis.core import QgsGeometry [as 别名]
# 或者: from qgis.core.QgsGeometry import asGeometryCollection [as 别名]
def processAlgorithm(self, progress):
vlayerA = dataobjects.getObjectFromUri(self.getParameterValue(Union.INPUT))
vlayerB = dataobjects.getObjectFromUri(self.getParameterValue(Union.INPUT2))
GEOS_EXCEPT = True
FEATURE_EXCEPT = True
vproviderA = vlayerA.dataProvider()
fields = vector.combineVectorFields(vlayerA, vlayerB)
names = [field.name() for field in fields]
ProcessingLog.addToLog(ProcessingLog.LOG_INFO, unicode(names))
writer = self.getOutputFromName(Union.OUTPUT).getVectorWriter(fields,
vproviderA.geometryType(), vproviderA.crs())
inFeatA = QgsFeature()
inFeatB = QgsFeature()
outFeat = QgsFeature()
indexA = vector.spatialindex(vlayerB)
indexB = vector.spatialindex(vlayerA)
count = 0
nElement = 0
featuresA = vector.features(vlayerA)
nFeat = len(featuresA)
for inFeatA in featuresA:
progress.setPercentage(nElement / float(nFeat) * 50)
nElement += 1
lstIntersectingB = []
geom = QgsGeometry(inFeatA.geometry())
atMapA = inFeatA.attributes()
intersects = indexA.intersects(geom.boundingBox())
if len(intersects) < 1:
try:
outFeat.setGeometry(geom)
outFeat.setAttributes(atMapA)
writer.addFeature(outFeat)
except:
# This really shouldn't happen, as we haven't
# edited the input geom at all
raise GeoAlgorithmExecutionException(
self.tr('Feature exception while computing union'))
else:
for id in intersects:
count += 1
request = QgsFeatureRequest().setFilterFid(id)
inFeatB = vlayerB.getFeatures(request).next()
atMapB = inFeatB.attributes()
tmpGeom = QgsGeometry(inFeatB.geometry())
if geom.intersects(tmpGeom):
int_geom = geom.intersection(tmpGeom)
lstIntersectingB.append(tmpGeom)
if int_geom is None:
# There was a problem creating the intersection
raise GeoAlgorithmExecutionException(
self.tr('Geometry exception while computing '
'intersection'))
else:
int_geom = QgsGeometry(int_geom)
if int_geom.wkbType() == QGis.WKBUnknown or QgsWKBTypes.flatType(int_geom.geometry().wkbType()) == QgsWKBTypes.GeometryCollection:
# Intersection produced different geomety types
temp_list = int_geom.asGeometryCollection()
for i in temp_list:
if i.type() == geom.type():
int_geom = QgsGeometry(i)
try:
outFeat.setGeometry(int_geom)
attrs = []
attrs.extend(atMapA)
attrs.extend(atMapB)
outFeat.setAttributes(attrs)
writer.addFeature(outFeat)
except Exception as err:
raise GeoAlgorithmExecutionException(
self.tr('Feature exception while computing union'))
try:
# the remaining bit of inFeatA's geometry
# if there is nothing left, this will just silently fail and we're good
diff_geom = QgsGeometry(geom)
if len(lstIntersectingB) != 0:
intB = QgsGeometry.unaryUnion(lstIntersectingB)
diff_geom = diff_geom.difference(intB)
if diff_geom.wkbType() == 0 or QgsWKBTypes.flatType(int_geom.geometry().wkbType()) == QgsWKBTypes.GeometryCollection:
temp_list = diff_geom.asGeometryCollection()
for i in temp_list:
if i.type() == geom.type():
diff_geom = QgsGeometry(i)
outFeat.setGeometry(diff_geom)
outFeat.setAttributes(atMapA)
writer.addFeature(outFeat)
except Exception as err:
raise GeoAlgorithmExecutionException(
self.tr('Feature exception while computing union'))
length = len(vproviderA.fields())
featuresA = vector.features(vlayerB)
nFeat = len(featuresA)
#.........这里部分代码省略.........