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b1cadb1822
have specific icons, instead of generic qgis icon We consider these 'top level' algorithms, and using the standard algorithm icon should help reflect this and differentiate them from 3rd party algorithms.
201 lines
8.2 KiB
Python
201 lines
8.2 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 (QgsApplication,
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QgsFeatureRequest,
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QgsFeature,
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QgsFeatureSink,
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QgsGeometry,
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QgsSpatialIndex,
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QgsWkbTypes,
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QgsMessageLog,
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QgsProcessingUtils)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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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 SplitWithLines(QgisAlgorithm):
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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 group(self):
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return self.tr('Vector overlay tools')
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def __init__(self):
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super().__init__()
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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 name(self):
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return 'splitwithlines'
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def displayName(self):
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return self.tr('Split with lines')
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def processAlgorithm(self, parameters, context, feedback):
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layerA = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT_A), context)
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splitLayer = 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.multiType(layerA.wkbType()),
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layerA.crs(), context)
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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 QgsProcessingUtils.getFeatures(splitLayer, context, 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 = QgsProcessingUtils.getFeatures(layerA, context)
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if QgsProcessingUtils.featureCount(layerA, context) == 0:
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total = 100
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else:
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total = 100.0 / layerA.featureCount() if layerA.featureCount() else 0
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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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if inGeom.isMultipart():
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inGeoms = []
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for g in inGeom.asGeometryCollection():
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inGeoms.append(g)
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else:
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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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engine = QgsGeometry.createGeometryEngine(inGeom.geometry())
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engine.prepareGeometry()
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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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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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split_geom_engine = QgsGeometry.createGeometryEngine(splitGeom.geometry())
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split_geom_engine.prepareGeometry()
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while len(inGeoms) > 0:
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inGeom = inGeoms.pop()
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if inGeom.isNull(): # this has been encountered and created a run-time error
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continue
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if split_geom_engine.intersects(inGeom.geometry()):
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inPoints = vector.extractPoints(inGeom)
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if splitterPList is 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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QgsMessageLog.logMessage(self.tr('Geometry exception while splitting'), 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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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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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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parts = []
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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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numPoints = aGeom.geometry().numPoints()
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if numPoints <= 2:
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if numPoints == 2:
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passed = not aGeom.geometry().isClosed() # tests if vertex 0 = vertex 1
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else:
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passed = False
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# sometimes splitting results in lines of zero length
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if passed:
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parts.append(aGeom)
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if len(parts) > 0:
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outFeat.setGeometry(QgsGeometry.collectGeometry(parts))
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writer.addFeature(outFeat, QgsFeatureSink.FastInsert)
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feedback.setProgress(int(current * total))
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del writer
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