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51 lines
1.9 KiB
Python
51 lines
1.9 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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from sextante.ftools import ftools_utils
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class ExtractNodes(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/extract_nodes.png")
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def processAlgorithm(self, progress):
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vlayer = QGisLayers.getObjectFromUri(self.getParameterValue(ExtractNodes.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(ExtractNodes.OUTPUT).getVectorWriter(fields, QGis.WKBPoint, 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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nElement += 1
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progress.setPercentage(int(nElement/nFeat * 100))
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inGeom = inFeat.geometry()
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atMap = inFeat.attributeMap()
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pointList = ftools_utils.extractPoints( inGeom )
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outFeat.setAttributeMap( atMap )
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for i in pointList:
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outFeat.setGeometry( outGeom.fromPoint( i ) )
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writer.addFeature( outFeat )
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del writer
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def defineCharacteristics(self):
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self.name = "Extract nodes"
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self.group = "Geometry tools"
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self.addParameter(ParameterVector(ExtractNodes.INPUT, "Input layer", ParameterVector.VECTOR_TYPE_ANY))
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self.addOutput(OutputVector(ExtractNodes.OUTPUT, "Output layer"))
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#=========================================================
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