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2628c480c5
Prevent changes to files that weren't changed between releases. This eases review of the changes between releases significantly.
111 lines
4.2 KiB
Python
111 lines
4.2 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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RandomSelection.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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import os
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import random
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from qgis.PyQt.QtGui import QIcon
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from qgis.core import (QgsApplication,
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QgsFeatureSink,
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QgsProcessingException,
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QgsProcessingUtils,
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QgsProcessingAlgorithm,
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QgsProcessingParameterVectorLayer,
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QgsProcessingParameterEnum,
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QgsProcessingParameterNumber,
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QgsProcessingParameterFeatureSink,
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QgsProcessingOutputVectorLayer)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class RandomSelection(QgisAlgorithm):
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INPUT = 'INPUT'
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OUTPUT = 'OUTPUT'
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METHOD = 'METHOD'
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NUMBER = 'NUMBER'
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def icon(self):
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return QgsApplication.getThemeIcon("/algorithms/mAlgorithmSelectRandom.svg")
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def svgIconPath(self):
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return QgsApplication.iconPath("/algorithms/mAlgorithmSelectRandom.svg")
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def group(self):
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return self.tr('Vector selection')
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def groupId(self):
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return 'vectorselection'
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def flags(self):
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return super().flags() | QgsProcessingAlgorithm.FlagNoThreading
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def __init__(self):
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super().__init__()
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def initAlgorithm(self, config=None):
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self.methods = [self.tr('Number of selected features'),
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self.tr('Percentage of selected features')]
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self.addParameter(QgsProcessingParameterVectorLayer(self.INPUT,
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self.tr('Input layer')))
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self.addParameter(QgsProcessingParameterEnum(self.METHOD,
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self.tr('Method'), self.methods, False, 0))
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self.addParameter(QgsProcessingParameterNumber(self.NUMBER,
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self.tr('Number/percentage of selected features'), QgsProcessingParameterNumber.Integer,
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10, False, 0.0))
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self.addOutput(QgsProcessingOutputVectorLayer(self.OUTPUT, self.tr('Selected (random)')))
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def name(self):
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return 'randomselection'
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def displayName(self):
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return self.tr('Random selection')
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def processAlgorithm(self, parameters, context, feedback):
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layer = self.parameterAsVectorLayer(parameters, self.INPUT, context)
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method = self.parameterAsEnum(parameters, self.METHOD, context)
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ids = layer.allFeatureIds()
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value = self.parameterAsInt(parameters, self.NUMBER, context)
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if method == 0:
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if value > len(ids):
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raise QgsProcessingException(
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self.tr('Selected number is greater than feature count. '
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'Choose a lower value and try again.'))
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else:
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if value > 100:
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raise QgsProcessingException(
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self.tr("Percentage can't be greater than 100. Set a "
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"different value and try again."))
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value = int(round(value / 100.0, 4) * len(ids))
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selran = random.sample(ids, value)
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layer.selectByIds(selran)
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return {self.OUTPUT: parameters[self.INPUT]}
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