mirror of
https://github.com/qgis/QGIS.git
synced 2025-04-09 00:05:52 -04:00
24ba0309ff
1) All fTools functions should now add all layers to dropdowns (including non-visible layers), 2) All fTools functions should now be non-modal 3) Several fTools functions have been spead up slightly 4) Where possible, internal (cpp) functions have be used to replace older Python functions 5) Defining projections now also considers .qpj files Fixes bugs #2502 and #2506, and possibly others? git-svn-id: http://svn.osgeo.org/qgis/trunk@13037 c8812cc2-4d05-0410-92ff-de0c093fc19c
140 lines
5.7 KiB
Python
Executable File
140 lines
5.7 KiB
Python
Executable File
# -*- coding: utf-8 -*-
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#-----------------------------------------------------------
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#
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# Random selection within subsets
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#
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# A QGIS plugin for randomly selecting features from
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# within multiple user defined subsets based on an input field.
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#
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# Copyright (C) 2008 Carson Farmer
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#
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# EMAIL: carson.farmer (at) gmail.com
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# WEB : www.geog.uvic.ca/spar/carson
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#
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#-----------------------------------------------------------
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#
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# licensed under the terms of GNU GPL 2
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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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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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#--------------------------------------------------------------------
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from PyQt4.QtCore import *
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from PyQt4.QtGui import *
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import random, ftools_utils
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from qgis.core import *
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from ui_frmSubsetSelect import Ui_Dialog
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class Dialog(QDialog, Ui_Dialog):
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def __init__(self, iface):
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QDialog.__init__(self)
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self.iface = iface
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# Set up the user interface from Designer.
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self.setupUi(self)
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QObject.connect(self.inShape, SIGNAL("currentIndexChanged(QString)"), self.update)
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self.setWindowTitle(self.tr("Random selection within subsets"))
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# populate layer list
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self.progressBar.setValue(0)
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mapCanvas = self.iface.mapCanvas()
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layers = ftools_utils.getLayerNames([QGis.Point, QGis.Line, QGis.Polygon])
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self.inShape.addItems(layers)
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def update(self, inputLayer):
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self.inField.clear()
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changedLayer = ftools_utils.getVectorLayerByName(inputLayer)
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changedField = ftools_utils.getFieldList(changedLayer)
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for i in changedField:
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self.inField.addItem(unicode(changedField[i].name()))
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maxFeatures = changedLayer.dataProvider().featureCount()
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self.spnNumber.setMaximum( maxFeatures )
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def accept(self):
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if self.inShape.currentText() == "":
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QMessageBox.information(self, self.tr("Random selection within subsets"), self.tr("Please specify input vector layer"))
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elif self.inField.currentText() == "":
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QMessageBox.information(self, self.tr("Random selection within subsets"), self.tr("Please specify an input field"))
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else:
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inVect = self.inShape.currentText()
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uidField = self.inField.currentText()
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if self.rdoNumber.isChecked():
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value = self.spnNumber.value()
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perc = False
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else:
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value = self.spnPercent.value()
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perc = True
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self.compute(inVect, uidField, value, perc, self.progressBar)
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self.progressBar.setValue(100)
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self.progressBar.setValue(0)
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def outFile(self):
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self.outShape.clear()
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fileDialog = QFileDialog()
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fileDialog.setConfirmOverwrite(False)
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outName = fileDialog.getSaveFileName(self, self.tr("Output Shapefile"),".", self.tr("Shapefiles (*.shp)"))
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fileCheck = QFile(outName)
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if fileCheck.exists():
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QMessageBox.warning(self, self.tr("Random selection within subsets"), self.tr("Cannot overwrite existing shapefile..."))
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else:
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filePath = QFileInfo(outName).absoluteFilePath()
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if filePath.right(4) != ".shp": filePath = filePath + ".shp"
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if not outName.isEmpty():
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self.outShape.clear()
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self.outShape.insert(filePath)
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def compute(self, inVect, inField, value, perc, progressBar):
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vlayer = ftools_utils.getVectorLayerByName(inVect)
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vprovider = vlayer.dataProvider()
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mlayer = self.getMapLayerByName(inVect)
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allAttrs = vprovider.attributeIndexes()
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vprovider.select(allAttrs)
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index = vprovider.fieldNameIndex(inField)
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#unique = []
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#vprovider.uniqueValues(index, unique)
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unique = ftools_utils.getUniqueValues(vprovider, int(index))
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inFeat = QgsFeature()
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selran = []
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mlayer.removeSelection(True)
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nFeat = vprovider.featureCount() * len(unique)
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nElement = 0
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self.progressBar.setValue(0)
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self.progressBar.setRange(0, nFeat)
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if not len(unique) == mlayer.featureCount():
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for i in unique:
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vprovider.rewind()
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FIDs= []
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while vprovider.nextFeature(inFeat):
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atMap = inFeat.attributeMap()
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if atMap[index] == QVariant(i):
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FID = inFeat.id()
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FIDs.append(FID)
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nElement += 1
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self.progressBar.setValue(nElement)
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if perc: selVal = int(round((value / 100.0000) * len(FIDs), 0))
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else: selVal = value
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if selVal >= len(FIDs): selran = FIDs
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else: selran = random.sample(FIDs, selVal)
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selran.extend(mlayer.selectedFeaturesIds())
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mlayer.setSelectedFeatures(selran)
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else:
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mlayer.setSelectedFeatures(range(0, mlayer.featureCount()))
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def getMapLayerByName(self, myName):
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mc = self.iface.mapCanvas()
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nLayers = mc.layerCount()
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for l in range(nLayers):
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layer = mc.layer(l)
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if layer.name() == unicode(myName,'latin1'):
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return layer
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