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90 lines
3.1 KiB
Python
90 lines
3.1 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Centroids.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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import os.path
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from PyQt4 import QtGui
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from PyQt4.QtCore import *
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from qgis.core import *
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from sextante.core.GeoAlgorithm import GeoAlgorithm
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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.parameters.ParameterVector import ParameterVector
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from sextante.outputs.OutputVector import OutputVector
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class Centroids(GeoAlgorithm):
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INPUT_LAYER = "INPUT_LAYER"
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OUTPUT_LAYER = "OUTPUT_LAYER"
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def getIcon(self):
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return QtGui.QIcon(os.path.dirname(__file__) + "/icons/centroids.png")
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def defineCharacteristics(self):
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self.name = "Polygon centroids"
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self.group = "Geometry tools"
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self.addParameter(ParameterVector(self.INPUT_LAYER, "Input layer", ParameterVector.VECTOR_TYPE_POLYGON))
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self.addOutput(OutputVector(self.OUTPUT_LAYER, "Output layer"))
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def processAlgorithm(self, progress):
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layer = QGisLayers.getObjectFromUri(self.getParameterValue(self.INPUT_LAYER))
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outFileName = self.getOutputValue(self.OUTPUT_LAYER)
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settings = QSettings()
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encoding = settings.value( "/UI/encoding", "System" ).toString()
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writer = self.getOutputFromName(self.OUTPUT_LAYER).getVectorWriter(layer.pendingFields(),
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QGis.WKBPoint, layer.dataProvider().crs())
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layer.select(layer.pendingAllAttributesList())
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inFeat = QgsFeature()
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outFeat = QgsFeature()
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total = 100.0 / float(layer.featureCount())
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current = 0
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while layer.nextFeature(inFeat):
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inGeom = inFeat.geometry()
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attrMap = inFeat.attributeMap()
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outGeom = QgsGeometry(inGeom.centroid())
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if outGeom is None:
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raise GeoAlgorithmExecutionException("Error calculating centroid")
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outFeat.setGeometry(outGeom)
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outFeat.setAttributeMap(attrMap)
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writer.addFeature(outFeat)
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current += 1
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progress.setPercentage(int(current * total))
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del writer
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