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06c4b07222
Since the layer has more complete knowledge of the crs (ie, when provider could not determine crs and user has selected it from the list), and also better knowledge of layer fields (virtual fields, joined fields) we should use these rather than the provider methods.
142 lines
6.1 KiB
Python
142 lines
6.1 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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__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'), [ParameterVector.VECTOR_TYPE_LINE]))
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self.addParameter(ParameterVector(self.INPUT_B,
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self.tr('Split layer'), [ParameterVector.VECTOR_TYPE_LINE]))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Splitted')))
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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.pendingFields()
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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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if len(lines) > 0: # hasIntersections
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splittingLines = []
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for i in lines:
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request = QgsFeatureRequest().setFilterFid(i)
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inFeatB = layerB.getFeatures(request).next()
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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 inGeom.intersects(splitGeom):
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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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while len(inLines) > 0:
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inGeom = inLines.pop()
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inPoints = vector.extractPoints(inGeom)
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if inGeom.intersects(splitGeom):
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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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