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107 lines
4.0 KiB
Python
107 lines
4.0 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Explode.py
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---------------------
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Date : August 2012
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Copyright : (C) 2012 by Victor Olaya
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Email : volayaf at gmail dot com
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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 range
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__author__ = 'Victor Olaya'
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__date__ = 'August 2012'
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__copyright__ = '(C) 2012, Victor Olaya'
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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 (QgsFeature,
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QgsGeometry,
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QgsFeatureSink,
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QgsWkbTypes,
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QgsProcessing,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterFeatureSink,
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QgsLineString)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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class Explode(QgisAlgorithm):
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INPUT = 'INPUT'
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OUTPUT = 'OUTPUT'
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def group(self):
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return self.tr('Vector geometry')
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def __init__(self):
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super().__init__()
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def initAlgorithm(self, config=None):
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self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
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self.tr('Input layer'), [QgsProcessing.TypeVectorLine]))
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self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT,
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self.tr('Exploded'), QgsProcessing.TypeVectorLine))
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def name(self):
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return 'explodelines'
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def displayName(self):
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return self.tr('Explode lines')
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def processAlgorithm(self, parameters, context, feedback):
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source = self.parameterAsSource(parameters, self.INPUT, context)
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(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
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source.fields(), QgsWkbTypes.singleType(source.wkbType()), source.sourceCrs())
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features = source.getFeatures()
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total = 100.0 / source.featureCount() if source.featureCount() else 0
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for current, feature in enumerate(features):
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if feedback.isCanceled():
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break
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feedback.setProgress(int(current * total))
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if not feature.hasGeometry():
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sink.addFeature(feature, QgsFeatureSink.FastInsert)
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continue
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outFeat = QgsFeature()
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inGeom = feature.geometry()
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segments = self.extractAsSingleSegments(inGeom)
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outFeat.setAttributes(feature.attributes())
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for segment in segments:
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outFeat.setGeometry(segment)
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sink.addFeature(outFeat, QgsFeatureSink.FastInsert)
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return {self.OUTPUT: dest_id}
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def extractAsSingleSegments(self, geom):
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segments = []
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if geom.isMultipart():
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for part in range(geom.geometry().numGeometries()):
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segments.extend(self.getPolylineAsSingleSegments(geom.geometry().geometryN(part)))
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else:
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segments.extend(self.getPolylineAsSingleSegments(
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geom.geometry()))
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return segments
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def getPolylineAsSingleSegments(self, polyline):
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segments = []
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for i in range(polyline.numPoints() - 1):
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ptA = polyline.pointN(i)
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ptB = polyline.pointN(i + 1)
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segment = QgsGeometry(QgsLineString([ptA, ptB]))
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segments.append(segment)
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return segments
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