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69 lines
2.5 KiB
Python
69 lines
2.5 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.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from sextante.outputs.OutputVector import OutputVector
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class PolygonsToLines(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__) + "/icons/to_lines.png")
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def processAlgorithm(self, progress):
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vlayer = QGisLayers.getObjectFromUri(self.getParameterValue(PolygonsToLines.INPUT))
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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 = self.getOutputFromName(self.OUTPUT).getVectorWriter(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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outGeom = 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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multi = False
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nElement += 1
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progress.setPercentage(int(nElement/nFeat * 100))
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inGeom = inFeat.geometry()
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if inGeom.isMultipart():
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multi = True
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atMap = inFeat.attributeMap()
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lineList = self.extractAsLine( inGeom )
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outFeat.setAttributeMap( atMap )
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for h in lineList:
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outFeat.setGeometry( outGeom.fromPolyline( h ) )
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writer.addFeature( outFeat )
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del writer
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def extractAsLine( self, geom ):
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multi_geom = QgsGeometry()
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temp_geom = []
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if geom.type() == 2:
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if geom.isMultipart():
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multi_geom = geom.asMultiPolygon()
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for i in multi_geom:
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temp_geom.extend(i)
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else:
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multi_geom = geom.asPolygon()
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temp_geom = multi_geom
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return temp_geom
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else:
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return []
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def defineCharacteristics(self):
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self.name = "Polygons to lines"
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self.group = "Geometry tools"
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self.addParameter(ParameterVector(PolygonsToLines.INPUT, "Input layer", ParameterVector.VECTOR_TYPE_POLYGON))
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self.addOutput(OutputVector(PolygonsToLines.OUTPUT, "Output layer"))
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#=========================================================
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