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review Random selection and Random selection within subsets
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from sextante.core.GeoAlgorithm import GeoAlgorithm | ||
import os.path | ||
import random | ||
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from PyQt4 import QtGui | ||
from PyQt4.QtCore import * | ||
from PyQt4.QtGui import * | ||
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from qgis.core import * | ||
from sextante.parameters.ParameterVector import ParameterVector | ||
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from sextante.core.GeoAlgorithm import GeoAlgorithm | ||
from sextante.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException | ||
from sextante.core.QGisLayers import QGisLayers | ||
from sextante.outputs.OutputVector import OutputVector | ||
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from sextante.parameters.ParameterSelection import ParameterSelection | ||
from sextante.parameters.ParameterVector import ParameterVector | ||
from sextante.parameters.ParameterNumber import ParameterNumber | ||
import random | ||
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from sextante.outputs.OutputVector import OutputVector | ||
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class RandomSelection(GeoAlgorithm): | ||
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INPUT = "INPUT" | ||
OUTPUT = "OUTPUT" | ||
METHOD = "METHOD" | ||
NUMBER = "NUMBER" | ||
PERCENTAGE = "PERCENTAGE" | ||
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METHODS = ["Number of selected features", | ||
"Percentage of selected features" | ||
] | ||
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def getIcon(self): | ||
return QtGui.QIcon(os.path.dirname(__file__) + "/icons/random_selection.png") | ||
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def defineCharacteristics(self): | ||
self.name = "Random selection" | ||
self.group = "Research tools" | ||
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self.addParameter(ParameterVector(self.INPUT, "Input layer", ParameterVector.VECTOR_TYPE_ANY)) | ||
self.addParameter(ParameterSelection(self.METHOD, "Method", self.METHODS, 0)) | ||
self.addParameter(ParameterNumber(self.NUMBER, "Number/persentage of selected features", 1, None, 10)) | ||
self.addOutput(OutputVector(self.OUTPUT, "Selection", True)) | ||
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def processAlgorithm(self, progress): | ||
filename = self.getParameterValue(RandomSelection.INPUT) | ||
filename = self.getParameterValue(self.INPUT) | ||
layer = QGisLayers.getObjectFromUri(filename) | ||
method = self.getParameterValue(self.METHOD) | ||
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featureCount = layer.featureCount() | ||
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value = int(self.getParameterValue(self.NUMBER)) | ||
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if method == 0: | ||
value = int(self.getParameterValue(self.NUMBER)) | ||
if value > featureCount: | ||
raise GeoAlgorithmExecutionException("Selected number is greater that feature count. Choose lesser value and try again.") | ||
else: | ||
value = self.getParameterValue(self.PERCENTAGE) | ||
value = int(round((value / 100.0000), 4) * layer.featureCount()) | ||
selran = random.sample(xrange(0, layer.featureCount()), value) | ||
layer.setSelectedFeatures(selran) | ||
self.setOutputValue(self.OUTPUT, filename) | ||
if value > 100: | ||
raise GeoAlgorithmExecutionException("Persentage can't be greater than 100. Set corrent value and try again.") | ||
value = int(round((value / 100.0000), 4) * featureCount) | ||
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selran = random.sample(xrange(0, featureCount), value) | ||
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def defineCharacteristics(self): | ||
self.name = "Random selection" | ||
self.group = "Research tools" | ||
self.addParameter(ParameterVector(RandomSelection.INPUT, "Input layer", ParameterVector.VECTOR_TYPE_ANY)) | ||
self.addParameter(ParameterSelection(RandomSelection.METHOD, "Method", ["Number of selected features", "Percentage of selected features"])) | ||
self.addParameter(ParameterNumber(RandomSelection.NUMBER, "Number of selected features", 1, None, 10)) | ||
self.addParameter(ParameterNumber(RandomSelection.PERCENTAGE, "Percentage of selected features", 0, 100, 50)) | ||
self.addOutput(OutputVector(RandomSelection.OUTPUT, "Selection", True)) | ||
layer.setSelectedFeatures(selran) | ||
self.setOutputValue(self.OUTPUT, filename) |
116 changes: 70 additions & 46 deletions
116
python/plugins/sextante/ftools/RandomSelectionWithinSubsets.py
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from sextante.core.GeoAlgorithm import GeoAlgorithm | ||
import os.path | ||
import random | ||
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from PyQt4 import QtGui | ||
from PyQt4.QtCore import * | ||
from PyQt4.QtGui import * | ||
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from qgis.core import * | ||
from sextante.parameters.ParameterVector import ParameterVector | ||
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from sextante.core.GeoAlgorithm import GeoAlgorithm | ||
from sextante.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException | ||
from sextante.core.QGisLayers import QGisLayers | ||
from sextante.outputs.OutputVector import OutputVector | ||
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from sextante.parameters.ParameterSelection import ParameterSelection | ||
from sextante.parameters.ParameterVector import ParameterVector | ||
from sextante.parameters.ParameterNumber import ParameterNumber | ||
import random | ||
from sextante.parameters.ParameterTableField import ParameterTableField | ||
from sextante.ftools import ftools_utils | ||
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from sextante.outputs.OutputVector import OutputVector | ||
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class RandomSelectionWithinSubsets(GeoAlgorithm): | ||
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INPUT = "INPUT" | ||
OUTPUT = "OUTPUT" | ||
METHOD = "METHOD" | ||
NUMBER = "NUMBER" | ||
PERCENTAGE = "PERCENTAGE" | ||
FIELD = "FIELD" | ||
OUTPUT = "OUTPUT" | ||
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METHODS = ["Number of selected features", | ||
"Percentage of selected features" | ||
] | ||
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def getIcon(self): | ||
return QtGui.QIcon(os.path.dirname(__file__) + "/icons/random_selection.png") | ||
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def defineCharacteristics(self): | ||
self.name = "Random selection within subsets" | ||
self.group = "Research tools" | ||
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self.addParameter(ParameterVector(self.INPUT, "Input layer", ParameterVector.VECTOR_TYPE_ANY)) | ||
self.addParameter(ParameterTableField(self.FIELD, "ID Field", self.INPUT)) | ||
self.addParameter(ParameterSelection(self.METHOD, "Method", self.METHODS, 0)) | ||
self.addParameter(ParameterNumber(self.NUMBER, "Number/persentage 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): | ||
filename = self.getParameterValue(self.INPUT) | ||
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layer = QGisLayers.getObjectFromUri(filename) | ||
field = self.getParameterValue(self.FIELD) | ||
method = self.getParameterValue(self.METHOD) | ||
field = self.getParameterValue(RandomSelectionWithinSubsets.FIELD) | ||
filename = self.getParameterValue(RandomSelectionWithinSubsets.INPUT) | ||
vlayer = QGisLayers.getObjectFromUri(filename) | ||
vlayer.removeSelection(True) | ||
vprovider = vlayer.dataProvider() | ||
allAttrs = vprovider.attributeIndexes() | ||
vprovider.select(allAttrs) | ||
index = vprovider.fieldNameIndex(field) | ||
unique = ftools_utils.getUniqueValues(vprovider, int(index)) | ||
inFeat = QgsFeature() | ||
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layer.removeSelection(True) | ||
provider = layer.dataProvider() | ||
index = layer.fieldNameIndex(field) | ||
layer.select([index]) | ||
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unique = layer.uniqueValues(index) | ||
featureCount = layer.featureCount() | ||
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value = int(self.getParameterValue(self.NUMBER)) | ||
if method == 0: | ||
if value > featureCount: | ||
raise GeoAlgorithmExecutionException("Selected number is greater that feature count. Choose lesser value and try again.") | ||
else: | ||
if value > 100: | ||
raise GeoAlgorithmExecutionException("Persentage can't be greater than 100. Set corrent value and try again.") | ||
value = value / 100.0 | ||
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selran = [] | ||
nFeat = vprovider.featureCount() * len(unique) | ||
nElement = 0 | ||
if not len(unique) == vlayer.featureCount(): | ||
inFeat = QgsFeature() | ||
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current = 0 | ||
total = 100.0 / float(featureCount * len(unique)) | ||
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if not len(unique) == featureCount: | ||
for i in unique: | ||
vprovider.rewind() | ||
FIDs= [] | ||
while vprovider.nextFeature(inFeat): | ||
layer.select([index]) | ||
while layer.nextFeature(inFeat): | ||
atMap = inFeat.attributeMap() | ||
if atMap[index] == QVariant(i): | ||
FID = inFeat.id() | ||
FIDs.append(FID) | ||
nElement += 1 | ||
progress.setPercentage(nElement/nFeat * 100) | ||
if method == 0: | ||
value = int(self.getParameterValue(self.NUMBER)) | ||
FIDs.append(inFeat.id()) | ||
current += 1 | ||
progress.setPercentage(int(current * total)) | ||
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if method == 1: | ||
selValue = int(round(value * len(FIDs), 0)) | ||
else: | ||
value = self.getParameterValue(self.PERCENTAGE) | ||
value = int(round((value / 100.0000) * len(FIDs), 0)) | ||
if value >= len(FIDs): | ||
selValue = value | ||
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if selValue >= len(FIDs): | ||
selFeat = FIDs | ||
else: | ||
selFeat = random.sample(FIDs, value) | ||
selFeat = random.sample(FIDs, selValue) | ||
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selran.extend(selFeat) | ||
vlayer.setSelectedFeatures(selran) | ||
layer.setSelectedFeatures(selran) | ||
else: | ||
vlayer.setSelectedFeatures(range(0, vlayer.featureCount())) | ||
self.setOutputValue(RandomSelectionWithinSubsets.OUTPUT, filename) | ||
layer.setSelectedFeatures(range(0, featureCount)) | ||
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def defineCharacteristics(self): | ||
self.name = "Random selection within subsets" | ||
self.group = "Research tools" | ||
self.addParameter(ParameterVector(RandomSelectionWithinSubsets.INPUT, "Input layer", ParameterVector.VECTOR_TYPE_ANY)) | ||
self.addParameter(ParameterTableField(RandomSelectionWithinSubsets.FIELD, "ID Field", RandomSelectionWithinSubsets.INPUT)) | ||
self.addParameter(ParameterSelection(RandomSelectionWithinSubsets.METHOD, "Method", ["Number of selected features", "Percentage of selected features"])) | ||
self.addParameter(ParameterNumber(RandomSelectionWithinSubsets.NUMBER, "Number of selected features", 1, None, 10)) | ||
self.addParameter(ParameterNumber(RandomSelectionWithinSubsets.PERCENTAGE, "Percentage of selected features", 0, 100, 50)) | ||
self.addOutput(OutputVector(RandomSelectionWithinSubsets.OUTPUT, "Selection", True)) | ||
self.setOutputValue(self.OUTPUT, filename) |