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124 lines
4.8 KiB
Python
124 lines
4.8 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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RandomSelectionWithinSubsets.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 random
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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.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from sextante.core.QGisLayers import QGisLayers
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from sextante.algs.ftools import FToolsUtils as utils
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from sextante.parameters.ParameterSelection import ParameterSelection
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from sextante.parameters.ParameterVector import ParameterVector
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from sextante.parameters.ParameterNumber import ParameterNumber
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from sextante.parameters.ParameterTableField import ParameterTableField
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from sextante.outputs.OutputVector import OutputVector
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class RandomSelectionWithinSubsets(GeoAlgorithm):
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INPUT = "INPUT"
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METHOD = "METHOD"
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NUMBER = "NUMBER"
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FIELD = "FIELD"
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OUTPUT = "OUTPUT"
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METHODS = ["Number of selected features",
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"Percentage of selected features"
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]
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#===========================================================================
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# def getIcon(self):
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# return QtGui.QIcon(os.path.dirname(__file__) + "/icons/random_selection.png")
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#===========================================================================
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def defineCharacteristics(self):
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self.name = "Random selection within subsets"
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self.group = "Vector selection tools"
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self.addParameter(ParameterVector(self.INPUT, "Input layer", ParameterVector.VECTOR_TYPE_ANY))
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self.addParameter(ParameterTableField(self.FIELD, "ID Field", self.INPUT))
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self.addParameter(ParameterSelection(self.METHOD, "Method", self.METHODS, 0))
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self.addParameter(ParameterNumber(self.NUMBER, "Number/percentage of selected features", 1, None, 10))
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self.addOutput(OutputVector(self.OUTPUT, "Selection", True))
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def processAlgorithm(self, progress):
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filename = self.getParameterValue(self.INPUT)
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layer = QGisLayers.getObjectFromUri(filename)
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field = self.getParameterValue(self.FIELD)
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method = self.getParameterValue(self.METHOD)
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layer.removeSelection(True)
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index = layer.fieldNameIndex(field)
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unique = utils.getUniqueValues(layer, index)
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featureCount = layer.featureCount()
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value = int(self.getParameterValue(self.NUMBER))
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if method == 0:
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if value > featureCount:
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raise GeoAlgorithmExecutionException("Selected number is greater that feature count. Choose lesser value and try again.")
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else:
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if value > 100:
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raise GeoAlgorithmExecutionException("Persentage can't be greater than 100. Set corrent value and try again.")
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value = value / 100.0
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selran = []
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inFeat = QgsFeature()
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current = 0
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total = 100.0 / float(featureCount * len(unique))
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features = QGisLayers.features(layer)
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if not len(unique) == featureCount:
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for i in unique:
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FIDs= []
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for inFeat in features:
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attrs = inFeat.attributes()
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if attrs[index] == QVariant(i):
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FIDs.append(inFeat.id())
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current += 1
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progress.setPercentage(int(current * total))
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if method == 1:
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selValue = int(round(value * len(FIDs), 0))
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else:
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selValue = value
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if selValue >= len(FIDs):
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selFeat = FIDs
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else:
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selFeat = random.sample(FIDs, selValue)
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selran.extend(selFeat)
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layer.setSelectedFeatures(selran)
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else:
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layer.setSelectedFeatures(range(0, featureCount))
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self.setOutputValue(self.OUTPUT, filename)
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