本文整理汇总了Python中qgis.core.QgsGeometry.createGeometryEngine方法的典型用法代码示例。如果您正苦于以下问题:Python QgsGeometry.createGeometryEngine方法的具体用法?Python QgsGeometry.createGeometryEngine怎么用?Python QgsGeometry.createGeometryEngine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.createGeometryEngine方法的15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: processAlgorithm
# 需要导入模块: from qgis.core import QgsGeometry [as 别名]
# 或者: from qgis.core.QgsGeometry import createGeometryEngine [as 别名]
def processAlgorithm(self, progress):
layerA = dataobjects.getObjectFromUri(self.getParameterValue(self.INPUT_A))
layerB = dataobjects.getObjectFromUri(self.getParameterValue(self.INPUT_B))
fieldA = self.getParameterValue(self.FIELD_A)
fieldB = self.getParameterValue(self.FIELD_B)
idxA = layerA.fields().lookupField(fieldA)
idxB = layerB.fields().lookupField(fieldB)
fieldList = [layerA.fields()[idxA],
layerB.fields()[idxB]]
writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fieldList,
QgsWkbTypes.Point, layerA.crs())
spatialIndex = vector.spatialindex(layerB)
outFeat = QgsFeature()
features = vector.features(layerA)
total = 100.0 / len(features)
hasIntersections = False
for current, inFeatA in enumerate(features):
inGeom = inFeatA.geometry()
hasIntersections = False
lines = spatialIndex.intersects(inGeom.boundingBox())
engine = None
if len(lines) > 0:
hasIntersections = True
# use prepared geometries for faster intersection tests
engine = QgsGeometry.createGeometryEngine(inGeom.geometry())
engine.prepareGeometry()
if hasIntersections:
request = QgsFeatureRequest().setFilterFids(lines)
for inFeatB in layerB.getFeatures(request):
tmpGeom = inFeatB.geometry()
points = []
attrsA = inFeatA.attributes()
attrsB = inFeatB.attributes()
if engine.intersects(tmpGeom.geometry()):
tempGeom = inGeom.intersection(tmpGeom)
if tempGeom.type() == QgsWkbTypes.PointGeometry:
if tempGeom.isMultipart():
points = tempGeom.asMultiPoint()
else:
points.append(tempGeom.asPoint())
for j in points:
outFeat.setGeometry(tempGeom.fromPoint(j))
outFeat.setAttributes([attrsA[idxA],
attrsB[idxB]])
writer.addFeature(outFeat)
progress.setPercentage(int(current * total))
del writer
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 createGeometryEngine [as 别名]
def processAlgorithm(self, parameters, context, feedback):
spacing = self.parameterAsDouble(parameters, self.SPACING, context)
inset = self.parameterAsDouble(parameters, self.INSET, context)
randomize = self.parameterAsBool(parameters, self.RANDOMIZE, context)
isSpacing = self.parameterAsBool(parameters, self.IS_SPACING, context)
crs = self.parameterAsCrs(parameters, self.CRS, context)
extent = self.parameterAsExtent(parameters, self.EXTENT, context, crs)
fields = QgsFields()
fields.append(QgsField('id', QVariant.Int, '', 10, 0))
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
fields, QgsWkbTypes.Point, crs)
if sink is None:
raise QgsProcessingException(self.invalidSinkError(parameters, self.OUTPUT))
if randomize:
seed()
area = extent.width() * extent.height()
if isSpacing:
pSpacing = spacing
else:
pSpacing = sqrt(area / spacing)
f = QgsFeature()
f.initAttributes(1)
f.setFields(fields)
count = 0
total = 100.0 / (area / pSpacing)
y = extent.yMaximum() - inset
extent_geom = QgsGeometry.fromRect(extent)
extent_engine = QgsGeometry.createGeometryEngine(extent_geom.constGet())
extent_engine.prepareGeometry()
while y >= extent.yMinimum():
x = extent.xMinimum() + inset
while x <= extent.xMaximum():
if feedback.isCanceled():
break
if randomize:
geom = QgsGeometry().fromPointXY(QgsPointXY(
uniform(x - (pSpacing / 2.0), x + (pSpacing / 2.0)),
uniform(y - (pSpacing / 2.0), y + (pSpacing / 2.0))))
else:
geom = QgsGeometry().fromPointXY(QgsPointXY(x, y))
if extent_engine.intersects(geom.constGet()):
f.setAttribute('id', count)
f.setGeometry(geom)
sink.addFeature(f, QgsFeatureSink.FastInsert)
x += pSpacing
count += 1
feedback.setProgress(int(count * total))
y = y - pSpacing
return {self.OUTPUT: dest_id}
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 createGeometryEngine [as 别名]
def processAlgorithm(self, feedback):
extent = str(self.getParameterValue(self.EXTENT)).split(',')
spacing = float(self.getParameterValue(self.SPACING))
inset = float(self.getParameterValue(self.INSET))
randomize = self.getParameterValue(self.RANDOMIZE)
isSpacing = self.getParameterValue(self.IS_SPACING)
crsId = self.getParameterValue(self.CRS)
crs = QgsCoordinateReferenceSystem()
crs.createFromUserInput(crsId)
extent = QgsRectangle(float(extent[0]), float(extent[2]),
float(extent[1]), float(extent[3]))
fields = QgsFields()
fields.append(QgsField('id', QVariant.Int, '', 10, 0))
writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(
fields, QgsWkbTypes.Point, crs)
if randomize:
seed()
area = extent.width() * extent.height()
if isSpacing:
pSpacing = spacing
else:
pSpacing = sqrt(area / spacing)
f = QgsFeature()
f.initAttributes(1)
f.setFields(fields)
count = 0
total = 100.0 / (area / pSpacing)
y = extent.yMaximum() - inset
extent_geom = QgsGeometry.fromRect(extent)
extent_engine = QgsGeometry.createGeometryEngine(extent_geom.geometry())
extent_engine.prepareGeometry()
while y >= extent.yMinimum():
x = extent.xMinimum() + inset
while x <= extent.xMaximum():
if randomize:
geom = QgsGeometry().fromPoint(QgsPoint(
uniform(x - (pSpacing / 2.0), x + (pSpacing / 2.0)),
uniform(y - (pSpacing / 2.0), y + (pSpacing / 2.0))))
else:
geom = QgsGeometry().fromPoint(QgsPoint(x, y))
if extent_engine.intersects(geom.geometry()):
f.setAttribute('id', count)
f.setGeometry(geom)
writer.addFeature(f)
x += pSpacing
count += 1
feedback.setProgress(int(count * total))
y = y - pSpacing
del writer
示例4: processAlgorithm
# 需要导入模块: from qgis.core import QgsGeometry [as 别名]
# 或者: from qgis.core.QgsGeometry import createGeometryEngine [as 别名]
def processAlgorithm(self, progress):
polyLayer = dataobjects.getObjectFromUri(self.getParameterValue(self.POLYGONS))
pointLayer = dataobjects.getObjectFromUri(self.getParameterValue(self.POINTS))
fieldName = self.getParameterValue(self.FIELD)
fieldIdx = pointLayer.fieldNameIndex(self.getParameterValue(self.WEIGHT))
polyProvider = polyLayer.dataProvider()
fields = polyProvider.fields()
fields.append(QgsField(fieldName, QVariant.Int))
(idxCount, fieldList) = vector.findOrCreateField(polyLayer,
polyLayer.pendingFields(), fieldName)
writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(
fields.toList(), polyProvider.geometryType(), polyProvider.crs())
spatialIndex = vector.spatialindex(pointLayer)
ftPoint = QgsFeature()
outFeat = QgsFeature()
geom = QgsGeometry()
features = vector.features(polyLayer)
total = 100.0 / len(features)
for current, ftPoly in enumerate(features):
geom = ftPoly.geometry()
engine = QgsGeometry.createGeometryEngine(geom.geometry())
engine.prepareGeometry()
attrs = ftPoly.attributes()
count = 0
points = spatialIndex.intersects(geom.boundingBox())
if len(points) > 0:
progress.setText(unicode(len(points)))
request = QgsFeatureRequest().setFilterFids(points)
fit = pointLayer.getFeatures(request)
ftPoint = QgsFeature()
while fit.nextFeature(ftPoint):
tmpGeom = QgsGeometry(ftPoint.geometry())
if engine.contains(tmpGeom.geometry()):
weight = unicode(ftPoint.attributes()[fieldIdx])
try:
count += float(weight)
except:
# Ignore fields with non-numeric values
pass
outFeat.setGeometry(geom)
if idxCount == len(attrs):
attrs.append(count)
else:
attrs[idxCount] = count
outFeat.setAttributes(attrs)
writer.addFeature(outFeat)
progress.setPercentage(int(current * total))
del writer
示例5: smart_clip
# 需要导入模块: from qgis.core import QgsGeometry [as 别名]
# 或者: from qgis.core.QgsGeometry import createGeometryEngine [as 别名]
def smart_clip(layer_to_clip, mask_layer, callback=None):
"""Smart clip a vector layer with another.
Issue https://github.com/inasafe/inasafe/issues/3186
:param layer_to_clip: The vector layer to clip.
:type layer_to_clip: QgsVectorLayer
:param mask_layer: The vector layer to use for clipping.
:type mask_layer: QgsVectorLayer
:param callback: A function to all to indicate progress. The function
should accept params 'current' (int), 'maximum' (int) and 'step' (str).
Defaults to None.
:type callback: function
:return: The clip vector layer.
:rtype: QgsVectorLayer
.. versionadded:: 4.0
"""
output_layer_name = smart_clip_steps['output_layer_name']
processing_step = smart_clip_steps['step_name']
writer = create_memory_layer(
output_layer_name,
layer_to_clip.geometryType(),
layer_to_clip.crs(),
layer_to_clip.fields()
)
writer.startEditing()
# first build up a list of clip geometries
request = QgsFeatureRequest().setSubsetOfAttributes([])
iterator = mask_layer.getFeatures(request)
feature = next(iterator)
geometries = QgsGeometry(feature.geometry())
# use prepared geometries for faster intersection tests
# noinspection PyArgumentList
engine = QgsGeometry.createGeometryEngine(geometries.geometry())
engine.prepareGeometry()
extent = mask_layer.extent()
for feature in layer_to_clip.getFeatures(QgsFeatureRequest(extent)):
if engine.intersects(feature.geometry().geometry()):
out_feat = QgsFeature()
out_feat.setGeometry(feature.geometry())
out_feat.setAttributes(feature.attributes())
writer.addFeature(out_feat)
writer.commitChanges()
writer.keywords = layer_to_clip.keywords.copy()
writer.keywords['title'] = output_layer_name
check_layer(writer)
return writer
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 createGeometryEngine [as 别名]
def processAlgorithm(self, progress):
polyLayer = dataobjects.getObjectFromUri(self.getParameterValue(self.POLYGONS))
pointLayer = dataobjects.getObjectFromUri(self.getParameterValue(self.POINTS))
fieldName = self.getParameterValue(self.FIELD)
classFieldName = self.getParameterValue(self.CLASSFIELD)
polyProvider = polyLayer.dataProvider()
fields = polyProvider.fields()
fields.append(QgsField(fieldName, QVariant.Int))
classFieldIndex = pointLayer.fieldNameIndex(classFieldName)
(idxCount, fieldList) = vector.findOrCreateField(polyLayer,
polyLayer.pendingFields(), fieldName)
writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(
fields.toList(), polyProvider.geometryType(), polyProvider.crs())
spatialIndex = vector.spatialindex(pointLayer)
ftPoint = QgsFeature()
outFeat = QgsFeature()
geom = QgsGeometry()
current = 0
features = vector.features(polyLayer)
total = 100.0 / float(len(features))
for ftPoly in features:
geom = ftPoly.geometry()
engine = QgsGeometry.createGeometryEngine(geom.geometry())
engine.prepareGeometry()
attrs = ftPoly.attributes()
classes = set()
points = spatialIndex.intersects(geom.boundingBox())
if len(points) > 0:
request = QgsFeatureRequest().setFilterFids(points)
fit = pointLayer.getFeatures(request)
ftPoint = QgsFeature()
while fit.nextFeature(ftPoint):
tmpGeom = QgsGeometry(ftPoint.geometry())
if engine.contains(tmpGeom.geometry()):
clazz = ftPoint.attributes()[classFieldIndex]
if clazz not in classes:
classes.add(clazz)
outFeat.setGeometry(geom)
if idxCount == len(attrs):
attrs.append(len(classes))
else:
attrs[idxCount] = len(classes)
outFeat.setAttributes(attrs)
writer.addFeature(outFeat)
current += 1
progress.setPercentage(current / total)
del writer
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 createGeometryEngine [as 别名]
def processAlgorithm(self, parameters, context, feedback):
source = self.parameterAsSource(parameters, self.INPUT, context)
extent = self.parameterAsExtent(parameters, self.TARGET_AREA, context)
target_crs = self.parameterAsCrs(parameters, self.TARGET_AREA_CRS, context)
target_geom = QgsGeometry.fromRect(extent)
fields = QgsFields()
fields.append(QgsField('auth_id', QVariant.String, '', 20))
(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
fields, QgsWkbTypes.NoGeometry, QgsCoordinateReferenceSystem())
# make intersection tests nice and fast
engine = QgsGeometry.createGeometryEngine(target_geom.constGet())
engine.prepareGeometry()
layer_bounds = QgsGeometry.fromRect(source.sourceExtent())
crses_to_check = QgsCoordinateReferenceSystem.validSrsIds()
total = 100.0 / len(crses_to_check)
found_results = 0
transform_context = QgsCoordinateTransformContext()
for current, srs_id in enumerate(crses_to_check):
if feedback.isCanceled():
break
candidate_crs = QgsCoordinateReferenceSystem.fromSrsId(srs_id)
if not candidate_crs.isValid():
continue
transform_candidate = QgsCoordinateTransform(candidate_crs, target_crs, transform_context)
transformed_bounds = QgsGeometry(layer_bounds)
try:
if not transformed_bounds.transform(transform_candidate) == 0:
continue
except:
continue
try:
if engine.intersects(transformed_bounds.constGet()):
feedback.pushInfo(self.tr('Found candidate CRS: {}').format(candidate_crs.authid()))
f = QgsFeature(fields)
f.setAttributes([candidate_crs.authid()])
sink.addFeature(f, QgsFeatureSink.FastInsert)
found_results += 1
except:
continue
feedback.setProgress(int(current * total))
if found_results == 0:
feedback.reportError(self.tr('No matching projections found'))
return {self.OUTPUT: dest_id}
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 createGeometryEngine [as 别名]
def processAlgorithm(self, parameters, context, feedback):
polyLayer = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.POLYGONS), context)
pointLayer = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.POINTS), context)
fieldName = self.getParameterValue(self.FIELD)
fieldIdx = pointLayer.fields().lookupField(self.getParameterValue(self.WEIGHT))
fields = polyLayer.fields()
fields.append(QgsField(fieldName, QVariant.Int))
(idxCount, fieldList) = vector.findOrCreateField(polyLayer,
polyLayer.fields(), fieldName)
writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fields, polyLayer.wkbType(),
polyLayer.crs(), context)
spatialIndex = QgsProcessingUtils.createSpatialIndex(pointLayer, context)
ftPoint = QgsFeature()
outFeat = QgsFeature()
geom = QgsGeometry()
features = QgsProcessingUtils.getFeatures(polyLayer, context)
total = 100.0 / QgsProcessingUtils.featureCount(polyLayer, context)
for current, ftPoly in enumerate(features):
geom = ftPoly.geometry()
engine = QgsGeometry.createGeometryEngine(geom.geometry())
engine.prepareGeometry()
attrs = ftPoly.attributes()
count = 0
points = spatialIndex.intersects(geom.boundingBox())
if len(points) > 0:
feedback.setProgressText(str(len(points)))
request = QgsFeatureRequest().setFilterFids(points).setSubsetOfAttributes([fieldIdx])
fit = pointLayer.getFeatures(request)
ftPoint = QgsFeature()
while fit.nextFeature(ftPoint):
tmpGeom = QgsGeometry(ftPoint.geometry())
if engine.contains(tmpGeom.geometry()):
weight = str(ftPoint.attributes()[fieldIdx])
try:
count += float(weight)
except:
# Ignore fields with non-numeric values
pass
outFeat.setGeometry(geom)
if idxCount == len(attrs):
attrs.append(count)
else:
attrs[idxCount] = count
outFeat.setAttributes(attrs)
writer.addFeature(outFeat)
feedback.setProgress(int(current * total))
del writer
示例9: processAlgorithm
# 需要导入模块: from qgis.core import QgsGeometry [as 别名]
# 或者: from qgis.core.QgsGeometry import createGeometryEngine [as 别名]
def processAlgorithm(self, progress):
vlayerA = dataobjects.getObjectFromUri(
self.getParameterValue(self.INPUT))
vlayerB = dataobjects.getObjectFromUri(
self.getParameterValue(self.INPUT2))
geomType = QgsWkbTypes.multiType(vlayerA.wkbType())
fields = vector.combineVectorFields(vlayerA, vlayerB)
writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fields,
geomType, vlayerA.crs())
outFeat = QgsFeature()
index = vector.spatialindex(vlayerB)
selectionA = vector.features(vlayerA)
total = 100.0 / len(selectionA)
for current, inFeatA in enumerate(selectionA):
progress.setPercentage(int(current * total))
geom = inFeatA.geometry()
atMapA = inFeatA.attributes()
intersects = index.intersects(geom.boundingBox())
request = QgsFeatureRequest().setFilterFids(intersects)
engine = None
if len(intersects) > 0:
# use prepared geometries for faster intersection tests
engine = QgsGeometry.createGeometryEngine(geom.geometry())
engine.prepareGeometry()
for inFeatB in vlayerB.getFeatures(request):
tmpGeom = inFeatB.geometry()
if engine.intersects(tmpGeom.geometry()):
atMapB = inFeatB.attributes()
int_geom = QgsGeometry(geom.intersection(tmpGeom))
if int_geom.wkbType() == QgsWkbTypes.Unknown or QgsWkbTypes.flatType(int_geom.geometry().wkbType()) == QgsWkbTypes.GeometryCollection:
int_com = geom.combine(tmpGeom)
int_geom = QgsGeometry()
if int_com:
int_sym = geom.symDifference(tmpGeom)
int_geom = QgsGeometry(int_com.difference(int_sym))
if int_geom.isGeosEmpty() or not int_geom.isGeosValid():
ProcessingLog.addToLog(ProcessingLog.LOG_ERROR,
self.tr('GEOS geoprocessing error: One or '
'more input features have invalid '
'geometry.'))
try:
if int_geom.wkbType() in wkbTypeGroups[wkbTypeGroups[int_geom.wkbType()]]:
outFeat.setGeometry(int_geom)
attrs = []
attrs.extend(atMapA)
attrs.extend(atMapB)
outFeat.setAttributes(attrs)
writer.addFeature(outFeat)
except:
ProcessingLog.addToLog(ProcessingLog.LOG_INFO,
self.tr('Feature geometry error: One or more output features ignored due to invalid geometry.'))
continue
del writer
示例10: processAlgorithm
# 需要导入模块: from qgis.core import QgsGeometry [as 别名]
# 或者: from qgis.core.QgsGeometry import createGeometryEngine [as 别名]
def processAlgorithm(self, parameters, context, feedback):
polyLayer = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.POLYGONS), context)
pointLayer = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.POINTS), context)
fieldName = self.getParameterValue(self.FIELD)
classFieldName = self.getParameterValue(self.CLASSFIELD)
fields = polyLayer.fields()
fields.append(QgsField(fieldName, QVariant.Int))
classFieldIndex = pointLayer.fields().lookupField(classFieldName)
(idxCount, fieldList) = vector.findOrCreateField(polyLayer,
polyLayer.fields(), fieldName)
writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fields, polyLayer.wkbType(),
polyLayer.crs(), context)
spatialIndex = QgsProcessingUtils.createSpatialIndex(pointLayer, context)
ftPoint = QgsFeature()
outFeat = QgsFeature()
geom = QgsGeometry()
features = QgsProcessingUtils.getFeatures(polyLayer, context)
total = 100.0 / polyLayer.featureCount() if polyLayer.featureCount() else 0
for current, ftPoly in enumerate(features):
geom = ftPoly.geometry()
engine = QgsGeometry.createGeometryEngine(geom.geometry())
engine.prepareGeometry()
attrs = ftPoly.attributes()
classes = set()
points = spatialIndex.intersects(geom.boundingBox())
if len(points) > 0:
request = QgsFeatureRequest().setFilterFids(points).setSubsetOfAttributes([classFieldIndex])
fit = pointLayer.getFeatures(request)
ftPoint = QgsFeature()
while fit.nextFeature(ftPoint):
tmpGeom = QgsGeometry(ftPoint.geometry())
if engine.contains(tmpGeom.geometry()):
clazz = ftPoint.attributes()[classFieldIndex]
if clazz not in classes:
classes.add(clazz)
outFeat.setGeometry(geom)
if idxCount == len(attrs):
attrs.append(len(classes))
else:
attrs[idxCount] = len(classes)
outFeat.setAttributes(attrs)
writer.addFeature(outFeat, QgsFeatureSink.FastInsert)
feedback.setProgress(int(current * total))
del writer
示例11: processAlgorithm
# 需要导入模块: from qgis.core import QgsGeometry [as 别名]
# 或者: from qgis.core.QgsGeometry import createGeometryEngine [as 别名]
def processAlgorithm(self, parameters, context, feedback):
vlayerA = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT), context)
vlayerB = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT2), context)
geomType = QgsWkbTypes.multiType(vlayerA.wkbType())
fields = vector.combineVectorFields(vlayerA, vlayerB)
writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fields, geomType, vlayerA.crs(), context)
outFeat = QgsFeature()
index = QgsProcessingUtils.createSpatialIndex(vlayerB, context)
selectionA = QgsProcessingUtils.getFeatures(vlayerA, context)
total = 100.0 / vlayerA.featureCount() if vlayerA.featureCount() else 0
for current, inFeatA in enumerate(selectionA):
feedback.setProgress(int(current * total))
geom = inFeatA.geometry()
atMapA = inFeatA.attributes()
intersects = index.intersects(geom.boundingBox())
request = QgsFeatureRequest().setFilterFids(intersects)
engine = None
if len(intersects) > 0:
# use prepared geometries for faster intersection tests
engine = QgsGeometry.createGeometryEngine(geom.geometry())
engine.prepareGeometry()
for inFeatB in vlayerB.getFeatures(request):
tmpGeom = inFeatB.geometry()
if engine.intersects(tmpGeom.geometry()):
atMapB = inFeatB.attributes()
int_geom = QgsGeometry(geom.intersection(tmpGeom))
if int_geom.wkbType() == QgsWkbTypes.Unknown or QgsWkbTypes.flatType(int_geom.geometry().wkbType()) == QgsWkbTypes.GeometryCollection:
int_com = geom.combine(tmpGeom)
int_geom = QgsGeometry()
if int_com:
int_sym = geom.symDifference(tmpGeom)
int_geom = QgsGeometry(int_com.difference(int_sym))
if int_geom.isEmpty() or not int_geom.isGeosValid():
raise GeoAlgorithmExecutionException(
self.tr('GEOS geoprocessing error: One or '
'more input features have invalid '
'geometry.'))
try:
if int_geom.wkbType() in wkbTypeGroups[wkbTypeGroups[int_geom.wkbType()]]:
outFeat.setGeometry(int_geom)
attrs = []
attrs.extend(atMapA)
attrs.extend(atMapB)
outFeat.setAttributes(attrs)
writer.addFeature(outFeat, QgsFeatureSink.FastInsert)
except:
raise GeoAlgorithmExecutionException(
self.tr('Feature geometry error: One or more '
'output features ignored due to invalid '
'geometry.'))
del writer
示例12: processAlgorithm
# 需要导入模块: from qgis.core import QgsGeometry [as 别名]
# 或者: from qgis.core.QgsGeometry import createGeometryEngine [as 别名]
def processAlgorithm(self, feedback):
polyLayer = dataobjects.getLayerFromString(self.getParameterValue(self.POLYGONS))
pointLayer = dataobjects.getLayerFromString(self.getParameterValue(self.POINTS))
fieldName = self.getParameterValue(self.FIELD)
fields = polyLayer.fields()
fields.append(QgsField(fieldName, QVariant.Int))
(idxCount, fieldList) = vector.findOrCreateField(polyLayer,
polyLayer.fields(), fieldName)
writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(
fields.toList(), polyLayer.wkbType(), polyLayer.crs())
spatialIndex = vector.spatialindex(pointLayer)
ftPoly = QgsFeature()
ftPoint = QgsFeature()
outFeat = QgsFeature()
geom = QgsGeometry()
features = vector.features(polyLayer)
total = 100.0 / len(features)
for current, ftPoly in enumerate(features):
geom = ftPoly.geometry()
engine = QgsGeometry.createGeometryEngine(geom.geometry())
engine.prepareGeometry()
attrs = ftPoly.attributes()
count = 0
points = spatialIndex.intersects(geom.boundingBox())
if len(points) > 0:
request = QgsFeatureRequest().setFilterFids(points).setSubsetOfAttributes([])
fit = pointLayer.getFeatures(request)
ftPoint = QgsFeature()
while fit.nextFeature(ftPoint):
tmpGeom = ftPoint.geometry()
if engine.contains(tmpGeom.geometry()):
count += 1
outFeat.setGeometry(geom)
if idxCount == len(attrs):
attrs.append(count)
else:
attrs[idxCount] = count
outFeat.setAttributes(attrs)
writer.addFeature(outFeat)
feedback.setProgress(int(current * total))
del writer
示例13: compute_graph
# 需要导入模块: from qgis.core import QgsGeometry [as 别名]
# 或者: from qgis.core.QgsGeometry import createGeometryEngine [as 别名]
def compute_graph(features, feedback, create_id_graph=False, min_distance=0):
""" compute topology from a layer/field """
s = Graph(sort_graph=False)
id_graph = None
if create_id_graph:
id_graph = Graph(sort_graph=True)
# skip features without geometry
features_with_geometry = {f_id: f for (f_id, f) in features.items() if f.hasGeometry()}
total = 70.0 / len(features_with_geometry) if features_with_geometry else 1
index = QgsSpatialIndex()
i = 0
for feature_id, f in features_with_geometry.items():
if feedback.isCanceled():
break
g = f.geometry()
if min_distance > 0:
g = g.buffer(min_distance, 5)
engine = QgsGeometry.createGeometryEngine(g.constGet())
engine.prepareGeometry()
feature_bounds = g.boundingBox()
# grow bounds a little so we get touching features
feature_bounds.grow(feature_bounds.width() * 0.01)
intersections = index.intersects(feature_bounds)
for l2 in intersections:
f2 = features_with_geometry[l2]
if engine.intersects(f2.geometry().constGet()):
s.add_edge(f.id(), f2.id())
s.add_edge(f2.id(), f.id())
if id_graph:
id_graph.add_edge(f.id(), f2.id())
index.insertFeature(f)
i += 1
feedback.setProgress(int(i * total))
for feature_id, f in features_with_geometry.items():
if feedback.isCanceled():
break
if feature_id not in s.node_edge:
s.add_edge(feature_id, None)
return s, id_graph
示例14: processAlgorithm
# 需要导入模块: from qgis.core import QgsGeometry [as 别名]
# 或者: from qgis.core.QgsGeometry import createGeometryEngine [as 别名]
def processAlgorithm(self, parameters, context, feedback):
layer = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT_LAYER), context)
extent = self.getParameterValue(self.TARGET_AREA).split(',')
if not extent:
extent = QgsProcessingUtils.combineLayerExtents([layer])
target_crs = QgsCoordinateReferenceSystem(self.getParameterValue(self.TARGET_AREA_CRS))
target_geom = QgsGeometry.fromRect(QgsRectangle(float(extent[0]), float(extent[2]),
float(extent[1]), float(extent[3])))
output_file = self.getOutputValue(self.OUTPUT_HTML_FILE)
# make intersection tests nice and fast
engine = QgsGeometry.createGeometryEngine(target_geom.geometry())
engine.prepareGeometry()
layer_bounds = QgsGeometry.fromRect(layer.extent())
results = []
for srs_id in QgsCoordinateReferenceSystem.validSrsIds():
candidate_crs = QgsCoordinateReferenceSystem.fromSrsId(srs_id)
if not candidate_crs.isValid():
continue
transform_candidate = QgsCoordinateTransform(candidate_crs, target_crs)
transformed_bounds = QgsGeometry(layer_bounds)
try:
if not transformed_bounds.transform(transform_candidate) == 0:
continue
except:
continue
if engine.intersects(transformed_bounds.geometry()):
results.append(candidate_crs.authid())
self.createHTML(output_file, results)
示例15: __init__
# 需要导入模块: from qgis.core import QgsGeometry [as 别名]
# 或者: from qgis.core.QgsGeometry import createGeometryEngine [as 别名]
def __init__(self, source, request):
super().__init__(request)
self._request = request if request is not None else QgsFeatureRequest()
self._source = source
self._index = 0
self._transform = QgsCoordinateTransform()
if self._request.destinationCrs().isValid() and self._request.destinationCrs() != self._source._provider.crs():
self._transform = QgsCoordinateTransform(self._source._provider.crs(), self._request.destinationCrs(), self._request.transformContext())
try:
self._filter_rect = self.filterRectToSourceCrs(self._transform)
except QgsCsException as e:
self.close()
return
self._filter_rect = self.filterRectToSourceCrs(self._transform)
if not self._filter_rect.isNull():
self._select_rect_geom = QgsGeometry.fromRect(self._filter_rect)
self._select_rect_engine = QgsGeometry.createGeometryEngine(self._select_rect_geom.constGet())
self._select_rect_engine.prepareGeometry()
else:
self._select_rect_engine = None
self._select_rect_geom = None
self._feature_id_list = None
if self._filter_rect is not None and self._source._provider._spatialindex is not None:
self._feature_id_list = self._source._provider._spatialindex.intersects(self._filter_rect)