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a05b610a8b
Wherever possible use prepared geometry engines for intersects type tests, as it's much faster
151 lines
6.5 KiB
Python
151 lines
6.5 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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SplitLines.py
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---------------------
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Date : November 2014
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Revised : February 2016
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Copyright : (C) 2014 by Bernhard Ströbl
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Email : bernhard dot stroebl at jena dot de
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************
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"""
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from builtins import next
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__author__ = 'Bernhard Ströbl'
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__date__ = 'November 2014'
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__copyright__ = '(C) 2014, Bernhard Ströbl'
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# This will get replaced with a git SHA1 when you do a git archive
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__revision__ = '$Format:%H$'
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from qgis.core import Qgis, QgsFeatureRequest, QgsFeature, QgsGeometry, QgsWkbTypes
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.parameters import ParameterVector
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from processing.core.outputs import OutputVector
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from processing.core.ProcessingLog import ProcessingLog
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from processing.tools import dataobjects
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from processing.tools import vector
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class SplitLinesWithLines(GeoAlgorithm):
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INPUT_A = 'INPUT_A'
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INPUT_B = 'INPUT_B'
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OUTPUT = 'OUTPUT'
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Split lines with lines')
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self.group, self.i18n_group = self.trAlgorithm('Vector overlay tools')
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self.addParameter(ParameterVector(self.INPUT_A,
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self.tr('Input layer'), [dataobjects.TYPE_VECTOR_LINE]))
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self.addParameter(ParameterVector(self.INPUT_B,
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self.tr('Split layer'), [dataobjects.TYPE_VECTOR_LINE]))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Splitted'), datatype=[dataobjects.TYPE_VECTOR_LINE]))
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def processAlgorithm(self, progress):
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layerA = dataobjects.getObjectFromUri(self.getParameterValue(self.INPUT_A))
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layerB = dataobjects.getObjectFromUri(self.getParameterValue(self.INPUT_B))
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sameLayer = self.getParameterValue(self.INPUT_A) == self.getParameterValue(self.INPUT_B)
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fieldList = layerA.fields()
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fieldList,
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QgsWkbTypes.LineString, layerA.crs())
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spatialIndex = vector.spatialindex(layerB)
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outFeat = QgsFeature()
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features = vector.features(layerA)
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total = 100.0 / float(len(features))
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for current, inFeatA in enumerate(features):
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inGeom = inFeatA.geometry()
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attrsA = inFeatA.attributes()
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outFeat.setAttributes(attrsA)
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inLines = [inGeom]
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lines = spatialIndex.intersects(inGeom.boundingBox())
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engine = None
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if len(lines) > 0:
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# use prepared geometries for faster intersection tests
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engine = QgsGeometry.createGeometryEngine(inGeom.geometry())
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engine.prepareGeometry()
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if len(lines) > 0: # hasIntersections
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splittingLines = []
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request = QgsFeatureRequest().setFilterFids(lines).setSubsetOfAttributes([])
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for inFeatB in layerB.getFeatures(request):
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# check if trying to self-intersect
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if sameLayer:
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if inFeatA.id() == inFeatB.id():
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continue
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splitGeom = inFeatB.geometry()
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if engine.intersects(splitGeom.geometry()):
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splittingLines.append(splitGeom)
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if len(splittingLines) > 0:
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for splitGeom in splittingLines:
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splitterPList = vector.extractPoints(splitGeom)
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outLines = []
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split_geom_engine = QgsGeometry.createGeometryEngine(splitGeom.geometry())
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split_geom_engine.prepareGeometry()
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while len(inLines) > 0:
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inGeom = inLines.pop()
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inPoints = vector.extractPoints(inGeom)
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if split_geom_engine.intersects(inGeom.geometry()):
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try:
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result, newGeometries, topoTestPoints = inGeom.splitGeometry(splitterPList, False)
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except:
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ProcessingLog.addToLog(ProcessingLog.LOG_WARNING,
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self.tr('Geometry exception while splitting'))
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result = 1
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# splitGeometry: If there are several intersections
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# between geometry and splitLine, only the first one is considered.
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if result == 0: # split occurred
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if inPoints == vector.extractPoints(inGeom):
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# bug in splitGeometry: sometimes it returns 0 but
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# the geometry is unchanged
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outLines.append(inGeom)
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else:
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inLines.append(inGeom)
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for aNewGeom in newGeometries:
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inLines.append(aNewGeom)
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else:
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outLines.append(inGeom)
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else:
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outLines.append(inGeom)
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inLines = outLines
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for aLine in inLines:
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if len(aLine.asPolyline()) > 2 or \
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(len(aLine.asPolyline()) == 2 and
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aLine.asPolyline()[0] != aLine.asPolyline()[1]):
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# sometimes splitting results in lines of zero length
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outFeat.setGeometry(aLine)
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writer.addFeature(outFeat)
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progress.setPercentage(int(current * total))
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del writer
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