本文整理汇总了Python中qgis.core.QgsProcessingUtils.uniqueValues方法的典型用法代码示例。如果您正苦于以下问题：Python QgsProcessingUtils.uniqueValues方法的具体用法？Python QgsProcessingUtils.uniqueValues怎么用？Python QgsProcessingUtils.uniqueValues使用的例子？那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类qgis.core.QgsProcessingUtils的用法示例。
在下文中一共展示了QgsProcessingUtils.uniqueValues方法的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的Python代码示例。
示例1: processAlgorithm
# 需要导入模块: from qgis.core import QgsProcessingUtils [as 别名]
# 或者: from qgis.core.QgsProcessingUtils import uniqueValues [as 别名]
def processAlgorithm(self, parameters, context, feedback):
filename = self.getParameterValue(self.INPUT)
layer = QgsProcessingUtils.mapLayerFromString(filename, context)
field = self.getParameterValue(self.FIELD)
method = self.getParameterValue(self.METHOD)
layer.removeSelection()
index = layer.fields().lookupField(field)
unique = QgsProcessingUtils.uniqueValues(layer, index, context)
featureCount = layer.featureCount()
value = int(self.getParameterValue(self.NUMBER))
if method == 0:
if value > featureCount:
raise GeoAlgorithmExecutionException(
self.tr('Selected number is greater that feature count. '
'Choose lesser value and try again.'))
else:
if value > 100:
raise GeoAlgorithmExecutionException(
self.tr("Percentage can't be greater than 100. Set a "
"different value and try again."))
value = value / 100.0
selran = []
inFeat = QgsFeature()
current = 0
total = 100.0 / (featureCount * len(unique))
if not len(unique) == featureCount:
for i in unique:
features = QgsProcessingUtils.getFeatures(layer, context)
FIDs = []
for inFeat in features:
attrs = inFeat.attributes()
if attrs[index] == i:
FIDs.append(inFeat.id())
current += 1
feedback.setProgress(int(current * total))
if method == 1:
selValue = int(round(value * len(FIDs), 0))
else:
selValue = value
if selValue >= len(FIDs):
selFeat = FIDs
else:
selFeat = random.sample(FIDs, selValue)
selran.extend(selFeat)
layer.selectByIds(selran)
else:
layer.selectByIds(list(range(featureCount))) # FIXME: implies continuous feature ids
self.setOutputValue(self.OUTPUT, filename)示例2: processAlgorithm
# 需要导入模块: from qgis.core import QgsProcessingUtils [as 别名]
# 或者: from qgis.core.QgsProcessingUtils import uniqueValues [as 别名]
def processAlgorithm(self, parameters, context, feedback):
layer = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT_LAYER), context)
fieldName = self.getParameterValue(self.FIELD_NAME)
outputFile = self.getOutputValue(self.OUTPUT)
values = QgsProcessingUtils.uniqueValues(layer, layer.fields().lookupField(fieldName), context)
self.createHTML(outputFile, values)
self.setOutputValue(self.TOTAL_VALUES, len(values))
self.setOutputValue(self.UNIQUE_VALUES, ';'.join([str(v) for v in
values]))示例3: processAlgorithm
# 需要导入模块: from qgis.core import QgsProcessingUtils [as 别名]
# 或者: from qgis.core.QgsProcessingUtils import uniqueValues [as 别名]
def processAlgorithm(self, parameters, context, feedback):
filename = self.getParameterValue(self.INPUT)
layer = QgsProcessingUtils.mapLayerFromString(filename, context)
field = self.getParameterValue(self.FIELD)
method = self.getParameterValue(self.METHOD)
index = layer.fields().lookupField(field)
features = QgsProcessingUtils.getFeatures(layer, context)
featureCount = QgsProcessingUtils.featureCount(layer, context)
unique = QgsProcessingUtils.uniqueValues(layer, index, context)
value = int(self.getParameterValue(self.NUMBER))
if method == 0:
if value > featureCount:
raise GeoAlgorithmExecutionException(
self.tr('Selected number is greater that feature count. '
'Choose lesser value and try again.'))
else:
if value > 100:
raise GeoAlgorithmExecutionException(
self.tr("Percentage can't be greater than 100. Set "
"correct value and try again."))
value = value / 100.0
writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(layer.fields(), layer.wkbType(),
layer.crs(), context)
selran = []
total = 100.0 / (featureCount * len(unique))
features = QgsProcessingUtils.getFeatures(layer, context)
classes = defaultdict(list)
for i, feature in enumerate(features):
attrs = feature.attributes()
classes[attrs[index]].append(feature)
feedback.setProgress(int(i * total))
for subset in classes.values():
selValue = value if method != 1 else int(round(value * len(subset), 0))
selran.extend(random.sample(subset, selValue))
features = QgsProcessingUtils.getFeatures(layer, context)
total = 100.0 / QgsProcessingUtils.featureCount(layer, context)
for (i, feat) in enumerate(selran):
writer.addFeature(feat)
feedback.setProgress(int(i * total))
del writer