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0e2ef065d7
Rename algorithm SplitLinesWithLines to SplitWithLines Accept polygon as input, too Use only selected lines to split with (if processing is set to use selection only) Issue log message if trying to split multi geometries Update help
188 lines
8.3 KiB
Python
188 lines
8.3 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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SplitWithLines.py
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---------------------
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Date : November 2014
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Revised : November 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 QgsFeatureRequest, QgsFeature, QgsGeometry, QgsSpatialIndex, QgsWkbTypes, QgsMessageLog
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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 SplitWithLines(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 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, single geometries only'), [dataobjects.TYPE_VECTOR_POLYGON,
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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('Split')))
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def processAlgorithm(self, progress):
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layerA = dataobjects.getObjectFromUri(self.getParameterValue(self.INPUT_A))
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splitLayer = 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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layerA.wkbType(), layerA.crs())
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spatialIndex = QgsSpatialIndex()
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splitGeoms = {}
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request = QgsFeatureRequest()
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request.setSubsetOfAttributes([])
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for aSplitFeature in vector.features(splitLayer, request):
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splitGeoms[aSplitFeature.id()] = aSplitFeature.geometry()
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spatialIndex.insertFeature(aSplitFeature)
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# honor the case that user has selection on split layer and has setting "use selection"
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outFeat = QgsFeature()
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features = vector.features(layerA)
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if len(features) == 0:
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total = 100
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else:
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total = 100.0 / float(len(features))
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multiGeoms = 0 # how many multi geometries were encountered
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for current, inFeatA in enumerate(features):
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inGeom = inFeatA.geometry()
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if inGeom.isMultipart():
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multiGeoms += 1
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# MultiGeometries are not allowed because the result of a splitted part cannot be clearly defined:
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# 1) add both new parts as new features
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# 2) store one part as a new feature and the other one as part of the multi geometry
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# 2a) which part should be which, seems arbitrary
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else:
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attrsA = inFeatA.attributes()
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outFeat.setAttributes(attrsA)
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inGeoms = [inGeom]
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lines = spatialIndex.intersects(inGeom.boundingBox())
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if len(lines) > 0: # has intersection of bounding boxes
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splittingLines = []
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for i in lines:
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try:
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splitGeom = splitGeoms[i]
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except:
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continue
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# check if trying to self-intersect
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if sameLayer:
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if inFeatA.id() == i:
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continue
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engine = QgsGeometry.createGeometryEngine(inGeom.geometry())
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engine.prepareGeometry()
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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 = None
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outGeoms = []
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while len(inGeoms) > 0:
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inGeom = inGeoms.pop()
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engine = QgsGeometry.createGeometryEngine(inGeom.geometry())
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engine.prepareGeometry()
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inPoints = vector.extractPoints(inGeom)
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if engine.intersects(splitGeom.geometry()):
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if splitterPList == None:
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splitterPList = vector.extractPoints(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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QgsMessageLog.logMessage("appending")
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outGeoms.append(inGeom)
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else:
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inGeoms.append(inGeom)
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for aNewGeom in newGeometries:
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inGeoms.append(aNewGeom)
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else:
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QgsMessageLog.logMessage("appending else")
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outGeoms.append(inGeom)
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else:
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outGeoms.append(inGeom)
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inGeoms = outGeoms
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for aGeom in inGeoms:
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passed = True
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if QgsWkbTypes.geometryType( aGeom.wkbType() ) == QgsWkbTypes.LineGeometry \
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and not QgsWkbTypes.isMultiType( aGeom.wkbType() ):
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passed = len(aGeom.asPolyline()) > 2
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if not passed:
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passed = (len(aGeom.asPolyline()) == 2 and
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aGeom.asPolyline()[0] != aGeom.asPolyline()[1])
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# sometimes splitting results in lines of zero length
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if passed:
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outFeat.setGeometry(aGeom)
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writer.addFeature(outFeat)
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progress.setPercentage(int(current * total))
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if multiGeoms > 0:
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ProcessingLog.addToLog(ProcessingLog.LOG_INFO,
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self.tr('Feature geometry error: %s input features ignored due to multi-geometry.') % str(multiGeoms))
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del writer
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