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e7fe61e6b9
available or compatible QGIS version is used Some housekeeping in QGIS algorithms provider
88 lines
3.4 KiB
Python
88 lines
3.4 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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__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 QGis, QgsFeature, QgsGeometry
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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, vector
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class Explode(GeoAlgorithm):
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INPUT = 'INPUT'
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OUTPUT = 'OUTPUT'
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Explode lines')
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self.group, self.i18n_group = self.trAlgorithm('Vector geometry tools')
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self.addParameter(ParameterVector(self.INPUT,
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self.tr('Input layer'), [ParameterVector.VECTOR_TYPE_LINE]))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Exploded')))
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def processAlgorithm(self, progress):
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vlayer = dataobjects.getObjectFromUri(
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self.getParameterValue(self.INPUT))
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output = self.getOutputFromName(self.OUTPUT)
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vprovider = vlayer.dataProvider()
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fields = vprovider.fields()
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writer = output.getVectorWriter(fields, QGis.WKBLineString,
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vlayer.crs())
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outFeat = QgsFeature()
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features = vector.features(vlayer)
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total = 100.0 / len(features)
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for current, feature in enumerate(features):
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progress.setPercentage(int(current * total))
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inGeom = feature.geometry()
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atMap = feature.attributes()
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segments = self.extractAsSingleSegments(inGeom)
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outFeat.setAttributes(atMap)
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for segment in segments:
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outFeat.setGeometry(segment)
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writer.addFeature(outFeat)
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del writer
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def extractAsSingleSegments(self, geom):
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segments = []
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if geom.isMultipart():
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multi = geom.asMultiPolyline()
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for polyline in multi:
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segments.extend(self.getPolylineAsSingleSegments(polyline))
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else:
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segments.extend(self.getPolylineAsSingleSegments(
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geom.asPolyline()))
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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(len(polyline) - 1):
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ptA = polyline[i]
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ptB = polyline[i + 1]
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segment = QgsGeometry.fromPolyline([ptA, ptB])
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segments.append(segment)
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return segments
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