本文整理汇总了Python中qgis.core.QgsSpatialIndex.deleteFeature方法的典型用法代码示例。如果您正苦于以下问题：Python QgsSpatialIndex.deleteFeature方法的具体用法？Python QgsSpatialIndex.deleteFeature怎么用？Python QgsSpatialIndex.deleteFeature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.QgsSpatialIndex的用法示例。
在下文中一共展示了QgsSpatialIndex.deleteFeature方法的1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 QgsSpatialIndex [as 别名]
# 或者: from qgis.core.QgsSpatialIndex import deleteFeature [as 别名]
def processAlgorithm(self, parameters, context, feedback):
"""
Here is where the processing itself takes place.
"""
# Retrieve the feature source and sink. The 'dest_id' variable is used
# to uniquely identify the feature sink, and must be included in the
# dictionary returned by the processAlgorithm function.
couche_lines = self.parameterAsVectorLayer(parameters, self.LINES, context)
couche_points = self.parameterAsVectorLayer(parameters, self.NODES, context)
radius=self.parameterAsDouble(parameters,self.RAYON,context)
# Compute the number of steps to display within the progress bar and
# get features from source
delta=float(radius)
index=QgsSpatialIndex()
lines=couche_lines.getFeatures()
for i in lines:
if i.geometry().isMultipart():
i.setGeometry(QgsGeometry.fromPolylineXY(i.geometry().asMultiPolyline()[0]))
index.insertFeature(i)
couche_lines.startEditing()
couche_lines.beginEditCommand(self.tr("Split polylines at connections"))
points=couche_points.getFeatures()
nb=couche_points.featureCount()
feedback.setProgressText(self.tr("Connecting points to lines..."))
for pos,pt in enumerate(points):
feedback.setProgress(pos*100.0/nb)
ptg=pt.geometry()
if ptg.isMultipart():
ptg=QgsGeometry.fromPoint(ptg.asMultiPoint()[0])
coor=ptg.asPoint()
nearest=index.intersects(QgsRectangle(coor.x()-delta,coor.y()-delta,coor.x()+delta,coor.y()+delta))
dmin=1e38
if len(nearest)>0:
for n in nearest:
f=couche_lines.getFeatures(request=QgsFeatureRequest(n))
for g in f:
d=g.geometry().distance(pt.geometry())
if d<=dmin:
dmin=d
gmin=g
gid=g.id()
g=gmin
if g.geometry().distance(pt.geometry())<delta:
a=g.geometry().closestSegmentWithContext(ptg.asPoint())
if not(a[2]==0):
geom=g.geometry()
geom.convertToSingleType()
geom_id=g.id()
att=g.attributes()
connexion=QgsFeature()
connexion.setGeometry(QgsGeometry.fromPolylineXY([ptg.asPoint(),a[1]]))
connexion.setAttributes(att)
couche_lines.addFeature(connexion)
geom.insertVertex(a[1][0],a[1][1],a[2])
geoma=geom.asPolyline()[:a[2]+1]
geomb=geom.asPolyline()[a[2]:]
feedback.setProgressText(unicode(geomb))
fa=QgsFeature()
fa.setGeometry(QgsGeometry.fromPolylineXY(geoma))
fa.setAttributes(att)
couche_lines.addFeature(fa)
index.insertFeature(fa)
fb=QgsFeature()
fb.setGeometry(QgsGeometry.fromPolylineXY(geomb))
fb.setAttributes(att)
couche_lines.addFeature(fb)
index.insertFeature(fb)
couche_lines.deleteFeature(g.id())
index.deleteFeature(g)
couche_lines.commitChanges()
couche_lines.endEditCommand()
return {self.LINES: 'OK'}