本文整理汇总了Python中qgis.core.QgsGeometry.splitGeometry方法的典型用法代码示例。如果您正苦于以下问题：Python QgsGeometry.splitGeometry方法的具体用法？Python QgsGeometry.splitGeometry怎么用？Python QgsGeometry.splitGeometry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.splitGeometry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 QgsGeometry [as 别名]
# 或者: from qgis.core.QgsGeometry import splitGeometry [as 别名]
def processAlgorithm(self, progress):
layerA = dataobjects.getObjectFromUri(self.getParameterValue(self.INPUT_A))
layerB = dataobjects.getObjectFromUri(self.getParameterValue(self.INPUT_B))
fieldList = layerA.pendingFields()
writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fieldList,
QGis.WKBLineString, layerA.dataProvider().crs())
spatialIndex = vector.spatialindex(layerB)
inFeatA = QgsFeature()
inFeatB = QgsFeature()
outFeat = QgsFeature()
inGeom = QgsGeometry()
splitGeom = QgsGeometry()
features = vector.features(layerA)
current = 0
total = 100.0 / float(len(features))
for inFeatA in features:
inGeom = inFeatA.geometry()
attrsA = inFeatA.attributes()
outFeat.setAttributes(attrsA)
inLines = [inGeom]
lines = spatialIndex.intersects(inGeom.boundingBox())
if len(lines) > 0: # hasIntersections
splittingLines = []
for i in lines:
request = QgsFeatureRequest().setFilterFid(i)
inFeatB = layerB.getFeatures(request).next()
splitGeom = QgsGeometry(inFeatB.geometry())
if inGeom.intersects(splitGeom):
splittingLines.append(splitGeom)
if len(splittingLines) > 0:
for splitGeom in splittingLines:
splitterPList = vector.extractPoints(splitGeom)
outLines = []
while len(inLines) > 0:
inGeom = inLines.pop()
inPoints = vector.extractPoints(inGeom)
if inGeom.intersects(splitGeom):
try:
result, newGeometries, topoTestPoints = inGeom.splitGeometry(splitterPList, False)
except:
ProcessingLog.addToLog(ProcessingLog.LOG_WARNING,
self.tr('Geometry exception while splitting'))
result = 1
# splitGeometry: If there are several intersections
# between geometry and splitLine, only the first one is considered.
if result == 0: # split occured
if inPoints == vector.extractPoints(inGeom):
# bug in splitGeometry: sometimes it returns 0 but
# the geometry is unchanged
outLines.append(inGeom)
else:
inLines.append(inGeom)
for aNewGeom in newGeometries:
inLines.append(aNewGeom)
else:
outLines.append(inGeom)
else:
outLines.append(inGeom)
inLines = outLines
for aLine in inLines:
outFeat.setGeometry(aLine)
writer.addFeature(outFeat)
current += 1
progress.setPercentage(int(current * total))
del writer