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93 lines
3.6 KiB
Python
93 lines
3.6 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 processing.core.GeoAlgorithm import GeoAlgorithm
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from PyQt4.QtCore import *
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from PyQt4.QtGui import *
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from qgis.core import *
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from processing.parameters.ParameterVector import ParameterVector
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from processing.core.QGisLayers import QGisLayers
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from processing.outputs.OutputVector import OutputVector
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class Explode(GeoAlgorithm):
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INPUT = "INPUT"
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OUTPUT = "OUTPUT"
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#===========================================================================
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# def getIcon(self):
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# return QtGui.QIcon(os.path.dirname(__file__) + "/../images/toolbox.png")
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#===========================================================================
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def processAlgorithm(self, progress):
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vlayer = QGisLayers.getObjectFromUri(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, vlayer.crs() )
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outFeat = QgsFeature()
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inGeom = QgsGeometry()
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nElement = 0
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features = QGisLayers.features(vlayer)
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nFeat = len(features)
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for feature in features:
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nElement += 1
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progress.setPercentage((nElement*100)/nFeat)
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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(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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def defineCharacteristics(self):
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self.name = "Explode lines"
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self.group = "Vector geometry tools"
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self.addParameter(ParameterVector(self.INPUT, "Input layer", [ParameterVector.VECTOR_TYPE_LINE]))
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self.addOutput(OutputVector(self.OUTPUT, "Output layer"))
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