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Algorithms and other processing code should use this method (instead of dataobjects.getLayerFromString) to retrieve layers from a string, as it considers the processing context and allows resolving strings to temporarily stored layers. This permits processing models to function correctly when intermediate results are stored as memory layers. Subsequent model algorithms can then access these temporary layers as inputs. All temporary layers will be removed when the context object is destroyed after the model algorithm is run.
173 lines
7.2 KiB
Python
173 lines
7.2 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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SplitLinesWithLines.py
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DEPRECATED, replaced by 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 (QgsProcessingAlgorithm,
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QgsApplication,
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QgsFeatureRequest,
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QgsFeature,
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QgsGeometry,
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QgsWkbTypes,
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QgsMessageLog,
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QgsProcessingUtils)
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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.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 flags(self):
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# this algorithm is deprecated - use SplitWithLines instead
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return QgsProcessingAlgorithm.FlagDeprecated
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def icon(self):
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return QgsApplication.getThemeIcon("/providerQgis.svg")
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def svgIconPath(self):
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return QgsApplication.iconPath("providerQgis.svg")
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def group(self):
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return self.tr('Vector overlay tools')
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def name(self):
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return 'splitlineswithlines'
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def displayName(self):
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return self.tr('Split lines with lines')
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def defineCharacteristics(self):
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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('Split'), datatype=[dataobjects.TYPE_VECTOR_LINE]))
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def processAlgorithm(self, context, feedback):
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layerA = dataobjects.QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT_A), context)
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layerB = dataobjects.QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT_B), context)
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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, QgsWkbTypes.LineString, layerA.crs(),
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context)
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spatialIndex = vector.spatialindex(layerB)
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outFeat = QgsFeature()
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features = QgsProcessingUtils.getFeatures(layerA, context)
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total = 100.0 / QgsProcessingUtils.featureCount(layerA, context)
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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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QgsMessageLog.logMessage(self.tr('Geometry exception while splitting'),
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self.tr('Processing'), QgsMessageLog.WARNING)
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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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feedback.setProgress(int(current * total))
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del writer
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