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73 lines
2.7 KiB
Python
73 lines
2.7 KiB
Python
from sextante.core.GeoAlgorithm import GeoAlgorithm
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import os.path
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from PyQt4 import QtGui
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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 sextante.parameters.ParameterVector import ParameterVector
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from sextante.core.QGisLayers import QGisLayers
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from sextante.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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def getIcon(self):
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return QtGui.QIcon(os.path.dirname(__file__) + "/../images/toolbox.png")
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def processAlgorithm(self, progress):
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settings = QSettings()
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systemEncoding = settings.value( "/UI/encoding", "System" ).toString()
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vlayer = QGisLayers.getObjectFromUri(self.getParameterValue(self.INPUT))
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output = self.getOutputValue(self.OUTPUT)
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vprovider = vlayer.dataProvider()
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allAttrs = vprovider.attributeIndexes()
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vprovider.select( allAttrs )
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fields = vprovider.fields()
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writer = QgsVectorFileWriter( output, systemEncoding,
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fields, QGis.WKBLineString, vprovider.crs() )
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inFeat = QgsFeature()
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outFeat = QgsFeature()
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inGeom = QgsGeometry()
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nFeat = vprovider.featureCount()
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nElement = 0
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while vprovider.nextFeature( inFeat ):
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nElement += 1
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progress.setPercentage((nElement*100)/nFeat)
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inGeom = inFeat.geometry()
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atMap = inFeat.attributeMap()
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segments = self.extractAsSingleSegments( inGeom )
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outFeat.setAttributeMap( 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 = "Algorithms for vector layers"
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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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