def getParameterFromString(s):
# Try the parameter definitions used in description files
if '|' in s and (s.startswith("Parameter") or s.startswith("*Parameter")):
isAdvanced = False
if s.startswith("*"):
s = s[1:]
isAdvanced = True
tokens = s.split("|")
params = [t if str(t) != str(None) else None for t in tokens[1:]]
try:
clazz = getattr(sys.modules[__name__], tokens[0])
param = clazz(*params)
if isAdvanced:
param.setFlags(param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
return param
except:
return None
else: # try script syntax
# try native method
param = QgsProcessingParameters.parameterFromScriptCode(s)
if param:
return param
# try Python duck-typed method
for paramClass in paramClasses:
try:
param = paramClass.fromScriptCode(s)
if param is not None:
return param
except:
pass
def __init__(self, dialog, param):
super(ExtentSelectionPanel, self).__init__(None)
self.setupUi(self)
self.leText.textChanged.connect(lambda: self.hasChanged.emit())
self.dialog = dialog
self.param = param
self.crs = QgsProject.instance().crs()
if self.param.flags() & QgsProcessingParameterDefinition.FlagOptional:
if hasattr(self.leText, 'setPlaceholderText'):
self.leText.setPlaceholderText(
self.tr('[Leave blank to use min covering extent]'))
self.btnSelect.clicked.connect(self.selectExtent)
if iface is not None:
canvas = iface.mapCanvas()
self.prevMapTool = canvas.mapTool()
self.tool = RectangleMapTool(canvas)
self.tool.rectangleCreated.connect(self.updateExtent)
else:
self.prevMapTool = None
self.tool = None
if param.defaultValue() is not None:
context = createContext()
rect = QgsProcessingParameters.parameterAsExtent(param, {param.name(): param.defaultValue()}, context)
crs = QgsProcessingParameters.parameterAsExtentCrs(param, {param.name(): param.defaultValue()}, context)
if not rect.isNull():
try:
s = '{},{},{},{}'.format(
rect.xMinimum(), rect.xMaximum(), rect.yMinimum(), rect.yMaximum())
if crs.isValid():
s += ' [' + crs.authid() + ']'
self.crs = crs
self.leText.setText(s)
except:
pass
def executeIterating(alg, parameters, paramToIter, context, feedback):
# Generate all single-feature layers
parameter_definition = alg.parameterDefinition(paramToIter)
if not parameter_definition:
return False
iter_source = QgsProcessingParameters.parameterAsSource(parameter_definition, parameters, context)
sink_list = []
if iter_source.featureCount() == 0:
return False
total = 100.0 / iter_source.featureCount()
for current, feat in enumerate(iter_source.getFeatures()):
if feedback.isCanceled():
return False
sink, sink_id = QgsProcessingUtils.createFeatureSink('memory:', context, iter_source.fields(), iter_source.wkbType(), iter_source.sourceCrs())
sink_list.append(sink_id)
sink.addFeature(feat, QgsFeatureSink.FastInsert)
del sink
feedback.setProgress(int(current * total))
# store output values to use them later as basenames for all outputs
outputs = {}
for out in alg.destinationParameterDefinitions():
if out.name() in parameters:
outputs[out.name()] = parameters[out.name()]
# now run all the algorithms
for i, f in enumerate(sink_list):
if feedback.isCanceled():
return False
parameters[paramToIter] = f
for out in alg.destinationParameterDefinitions():
if out.name() not in outputs:
continue
o = outputs[out.name()]
parameters[out.name()] = QgsProcessingUtils.generateIteratingDestination(o, i, context)
feedback.setProgressText(QCoreApplication.translate('AlgorithmExecutor', 'Executing iteration {0}/{1}…').format(i + 1, len(sink_list)))
feedback.setProgress(i * 100 / len(sink_list))
ret, results = execute(alg, parameters, context, feedback)
if not ret:
return False
handleAlgorithmResults(alg, context, feedback, False)
return True
def fromScriptCode(self, line):
isOptional, name, definition = _splitParameterOptions(line)
descName = QgsProcessingParameters.descriptionFromName(name)
if definition.lower().strip().startswith('selectionfromfile'):
options = definition.strip()[len('selectionfromfile '):].split(';')
return ParameterSelection(name, descName, options, isSource=True, optional=isOptional)
elif definition.lower().strip().startswith('selection'):
options = definition.strip()[len('selection '):].split(';')
return ParameterSelection(name, descName, options, optional=isOptional)
elif definition.lower().strip().startswith('multipleselectionfromfile'):
options = definition.strip()[len('multipleselectionfromfile '):].split(';')
return ParameterSelection(name, descName, options, isSource=True,
multiple=True, optional=isOptional)
elif definition.lower().strip().startswith('multipleselection'):
options = definition.strip()[len('multipleselection '):].split(';')
return ParameterSelection(name, descName, options, multiple=True, optional=isOptional)
def getParameterFromString(s):
# Try the parameter definitions used in description files
if '|' in s and (s.startswith("QgsProcessingParameter") or s.startswith("*QgsProcessingParameter") or s.startswith('Parameter') or s.startswith('*Parameter')):
isAdvanced = False
if s.startswith("*"):
s = s[1:]
isAdvanced = True
tokens = s.split("|")
params = [t if str(t) != str(None) else None for t in tokens[1:]]
if True:
clazz = getattr(sys.modules[__name__], tokens[0])
# convert to correct type
if clazz == QgsProcessingParameterRasterLayer:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
elif clazz == QgsProcessingParameterBand:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
elif clazz == QgsProcessingParameterVectorLayer:
if len(params) > 2:
params[2] = [int(p) for p in params[2].split(';')]
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
elif clazz == QgsProcessingParameterMapLayer:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
elif clazz == QgsProcessingParameterBoolean:
if len(params) > 2:
params[2] = True if params[2].lower() == 'true' else False
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
elif clazz == QgsProcessingParameterPoint:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
elif clazz == QgsProcessingParameterCrs:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
elif clazz == QgsProcessingParameterRange:
if len(params) > 2:
try:
params[2] = int(params[2])
except:
params[2] = getattr(QgsProcessingParameterNumber, params[2].split(".")[1])
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
elif clazz == QgsProcessingParameterExtent:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
elif clazz == QgsProcessingParameterExpression:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
elif clazz == QgsProcessingParameterEnum:
if len(params) > 2:
params[2] = params[2].split(';')
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
if len(params) > 4:
# For multiple values; default value is a list of int
if params[3] == True:
params[4] = [int(v) for v in params[4].split(',')] if params[4] is not None else None
else:
params[4] = int(params[4]) if params[4] is not None else None
if len(params) > 5:
params[5] = True if params[5].lower() == 'true' else False
elif clazz == QgsProcessingParameterFeatureSource:
if len(params) > 2:
try:
params[2] = [int(p) for p in params[2].split(';')]
except:
params[2] = [getattr(QgsProcessing, p.split(".")[1]) for p in params[2].split(';')]
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
elif clazz == QgsProcessingParameterMultipleLayers:
if len(params) > 2:
try:
params[2] = int(params[2])
except:
params[2] = getattr(QgsProcessing, params[2].split(".")[1])
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
elif clazz == QgsProcessingParameterMatrix:
if len(params) > 2:
params[2] = int(params[2])
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
if len(params) > 4:
params[4] = params[4].split(';')
if len(params) > 6:
params[6] = True if params[6].lower() == 'true' else False
elif clazz == QgsProcessingParameterField:
if len(params) > 4:
try:
params[4] = int(params[4])
except:
params[4] = getattr(QgsProcessingParameterField, params[4].split(".")[1])
if len(params) > 5:
params[5] = True if params[5].lower() == 'true' else False
if len(params) > 6:
params[6] = True if params[6].lower() == 'true' else False
elif clazz == QgsProcessingParameterFile:
if len(params) > 2:
try:
params[2] = int(params[2])
except:
params[2] = getattr(QgsProcessingParameterFile, params[2].split(".")[1])
if len(params) > 5:
params[5] = True if params[5].lower() == 'true' else False
elif clazz == QgsProcessingParameterNumber:
if len(params) > 2:
try:
params[2] = int(params[2])
except:
params[2] = getattr(QgsProcessingParameterNumber, params[2].split(".")[1])
if len(params) > 3:
params[3] = float(params[3].strip()) if params[3] is not None else None
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
if len(params) > 5:
params[5] = float(params[5].strip()) if params[5] is not None else -sys.float_info.max + 1
if len(params) > 6:
params[6] = float(params[6].strip()) if params[6] is not None else sys.float_info.max - 1
elif clazz == QgsProcessingParameterString:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
elif clazz == QgsProcessingParameterFileDestination:
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
if len(params) > 5:
params[5] = True if params[5].lower() == 'true' else False
elif clazz == QgsProcessingParameterFolderDestination:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
elif clazz == QgsProcessingParameterRasterDestination:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
elif clazz == QgsProcessingParameterVectorDestination:
if len(params) > 2:
try:
params[2] = int(params[2])
except:
params[2] = getattr(QgsProcessing, params[2].split(".")[1])
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
if len(params) > 5:
params[5] = True if params[5].lower() == 'true' else False
param = clazz(*params)
if isAdvanced:
param.setFlags(param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
return param
else:
return None
else: # try script syntax
# try native method
param = QgsProcessingParameters.parameterFromScriptCode(s)
if param:
return param
def prepareAlgorithm(self, parameters, context, feedback):
self.m_value = self.parameterAsDouble(parameters, self.M_VALUE, context)
self.dynamic_m = QgsProcessingParameters.isDynamic(parameters, self.M_VALUE)
if self.dynamic_m:
self.m_property = parameters[self.M_VALUE]
return True
def getParameterFromString(s, context=''):
# Try the parameter definitions used in description files
if '|' in s and (s.startswith("QgsProcessingParameter")
or s.startswith("*QgsProcessingParameter") or
s.startswith('Parameter') or s.startswith('*Parameter')):
isAdvanced = False
if s.startswith("*"):
s = s[1:]
isAdvanced = True
tokens = s.split("|")
params = [t if str(t) != str(None) else None for t in tokens[1:]]
if True:
clazz = getattr(sys.modules[__name__], tokens[0])
# convert to correct type
if clazz == QgsProcessingParameterRasterLayer:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
elif clazz == QgsProcessingParameterBand:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
elif clazz == QgsProcessingParameterVectorLayer:
if len(params) > 2:
params[2] = [int(p) for p in params[2].split(';')]
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
elif clazz == QgsProcessingParameterMapLayer:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
elif clazz == QgsProcessingParameterBoolean:
if len(params) > 2:
params[2] = True if params[2].lower() == 'true' else False
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
elif clazz == QgsProcessingParameterPoint:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
elif clazz == QgsProcessingParameterCrs:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
elif clazz == QgsProcessingParameterRange:
if len(params) > 2:
try:
params[2] = int(params[2])
except:
params[2] = getattr(QgsProcessingParameterNumber,
params[2].split(".")[1])
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
elif clazz == QgsProcessingParameterExtent:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
elif clazz == QgsProcessingParameterExpression:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
elif clazz == QgsProcessingParameterEnum:
if len(params) > 2:
params[2] = params[2].split(';')
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
if len(params) > 4:
# For multiple values; default value is a list of int
if params[3] == True:
params[4] = [int(v) for v in params[4].split(',')
] if params[4] is not None else None
else:
params[4] = int(
params[4]) if params[4] is not None else None
if len(params) > 5:
params[5] = True if params[5].lower() == 'true' else False
elif clazz == QgsProcessingParameterFeatureSource:
if len(params) > 2:
try:
params[2] = [int(p) for p in params[2].split(';')]
except:
params[2] = [
getattr(QgsProcessing,
p.split(".")[1])
for p in params[2].split(';')
]
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
elif clazz == QgsProcessingParameterMultipleLayers:
if len(params) > 2:
try:
params[2] = int(params[2])
except:
params[2] = getattr(QgsProcessing,
params[2].split(".")[1])
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
elif clazz == QgsProcessingParameterMatrix:
if len(params) > 2:
params[2] = int(params[2])
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
if len(params) > 4:
params[4] = params[4].split(';')
if len(params) > 6:
params[6] = True if params[6].lower() == 'true' else False
elif clazz == QgsProcessingParameterField:
if len(params) > 4:
try:
params[4] = int(params[4])
except:
params[4] = getattr(QgsProcessingParameterField,
params[4].split(".")[1])
if len(params) > 5:
params[5] = True if params[5].lower() == 'true' else False
if len(params) > 6:
params[6] = True if params[6].lower() == 'true' else False
elif clazz == QgsProcessingParameterFile:
if len(params) > 2:
try:
params[2] = int(params[2])
except:
params[2] = getattr(QgsProcessingParameterFile,
params[2].split(".")[1])
if len(params) > 5:
params[5] = True if params[5].lower() == 'true' else False
elif clazz == QgsProcessingParameterNumber:
if len(params) > 2:
try:
params[2] = int(params[2])
except:
params[2] = getattr(QgsProcessingParameterNumber,
params[2].split(".")[1])
if len(params) > 3:
params[3] = float(
params[3].strip()) if params[3] is not None else None
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
if len(params) > 5:
params[5] = float(params[5].strip(
)) if params[5] is not None else -sys.float_info.max + 1
if len(params) > 6:
params[6] = float(params[6].strip(
)) if params[6] is not None else sys.float_info.max - 1
elif clazz == QgsProcessingParameterString:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
elif clazz == QgsProcessingParameterColor:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
elif clazz == QgsProcessingParameterFileDestination:
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
if len(params) > 5:
params[5] = True if params[5].lower() == 'true' else False
elif clazz == QgsProcessingParameterFolderDestination:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
elif clazz == QgsProcessingParameterRasterDestination:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
elif clazz == QgsProcessingParameterVectorDestination:
if len(params) > 2:
try:
params[2] = int(params[2])
except:
params[2] = getattr(QgsProcessing,
params[2].split(".")[1])
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
if len(params) > 5:
params[5] = True if params[5].lower() == 'true' else False
param = clazz(*params)
if isAdvanced:
param.setFlags(param.flags()
| QgsProcessingParameterDefinition.FlagAdvanced)
param.setDescription(
QCoreApplication.translate(context, param.description()))
return param
else:
return None
else: # try script syntax
# try native method
param = QgsProcessingParameters.parameterFromScriptCode(s)
if param:
return param
def getParameterFromString(s):
# Try the parameter definitions used in description files
if '|' in s and (s.startswith("QgsProcessingParameter")
or s.startswith("*QgsProcessingParameter") or
s.startswith('Parameter') or s.startswith('*Parameter')):
isAdvanced = False
if s.startswith("*"):
s = s[1:]
isAdvanced = True
tokens = s.split("|")
params = [t if str(t) != str(None) else None for t in tokens[1:]]
if True:
clazz = getattr(sys.modules[__name__], tokens[0])
# convert to correct type
if clazz == QgsProcessingParameterRasterLayer:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
elif clazz == QgsProcessingParameterVectorLayer:
if len(params) > 2:
params[2] = [int(p) for p in params[2].split(';')]
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
elif clazz == QgsProcessingParameterBoolean:
if len(params) > 2:
params[2] = True if params[2].lower() == 'true' else False
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
elif clazz == QgsProcessingParameterPoint:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
elif clazz == QgsProcessingParameterCrs:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
elif clazz == QgsProcessingParameterRange:
if len(params) > 2:
params[2] = QgsProcessingParameterNumber.Integer if params[
2].lower().endswith(
'integer') else QgsProcessingParameterNumber.Double
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
elif clazz == QgsProcessingParameterExtent:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
elif clazz == QgsProcessingParameterEnum:
if len(params) > 2:
params[2] = params[2].split(';')
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
if len(params) > 4:
# For multiple values; default value is a list of int
if params[3] == True:
params[4] = [int(v) for v in params[4].split(',')]
else:
params[4] = int(params[4])
if len(params) > 5:
params[5] = True if params[5].lower() == 'true' else False
elif clazz == QgsProcessingParameterFeatureSource:
if len(params) > 2:
params[2] = [int(p) for p in params[2].split(';')]
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
elif clazz == QgsProcessingParameterMultipleLayers:
if len(params) > 2:
params[2] = int(params[2])
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
elif clazz == QgsProcessingParameterMatrix:
if len(params) > 2:
params[2] = int(params[2])
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
if len(params) > 4:
params[4] = params[4].split(';')
elif clazz == QgsProcessingParameterField:
if len(params) > 4:
params[4] = int(params[4])
if len(params) > 5:
params[5] = True if params[5].lower() == 'true' else False
if len(params) > 6:
params[6] = True if params[6].lower() == 'true' else False
elif clazz == QgsProcessingParameterFile:
if len(params) > 2:
params[2] = QgsProcessingParameterFile.File if params[
2].lower(
) == 'false' else QgsProcessingParameterFile.Folder
if len(params) > 5:
params[5] = True if params[5].lower() == 'true' else False
elif clazz == QgsProcessingParameterNumber:
if len(params) > 2:
params[2] = QgsProcessingParameterNumber.Integer if params[
2].lower().endswith(
'integer') else QgsProcessingParameterNumber.Double
if len(params) > 3:
params[3] = float(
params[3].strip()) if params[3] is not None else None
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
if len(params) > 5:
params[5] = float(params[5].strip(
)) if params[5] is not None else -sys.float_info.max + 1
if len(params) > 6:
params[6] = float(params[6].strip(
)) if params[6] is not None else sys.float_info.max - 1
elif clazz == QgsProcessingParameterString:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
elif clazz == QgsProcessingParameterFileDestination:
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
elif clazz == QgsProcessingParameterFolderDestination:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
elif clazz == QgsProcessingParameterRasterDestination:
if len(params) > 3:
params[3] = True if params[3].lower() == 'true' else False
elif clazz == QgsProcessingParameterVectorDestination:
if len(params) > 2:
if params[2].lower().endswith('point'):
params[2] = QgsProcessing.TypeVectorPoint
elif params[2].lower().endswith('line'):
params[2] = QgsProcessing.TypeVectorLine
elif params[2].lower().endswith('polygon'):
params[2] = QgsProcessing.TypeVectorPolygon
elif params[2].lower().endswith('geometry'):
params[2] = QgsProcessing.TypeVectorAnyGeometry
elif params[2].lower().endswith('vector'):
params[2] = QgsProcessing.TypeVector
if len(params) > 4:
params[4] = True if params[4].lower() == 'true' else False
param = clazz(*params)
if isAdvanced:
param.setFlags(param.flags()
| QgsProcessingParameterDefinition.FlagAdvanced)
return param
else:
return None
else: # try script syntax
# try native method
param = QgsProcessingParameters.parameterFromScriptCode(s)
if param:
return param
def prepareAlgorithm(self, parameters, context, feedback):
self.z_value = self.parameterAsDouble(parameters, self.Z_VALUE, context)
self.dynamic_z = QgsProcessingParameters.isDynamic(parameters, self.Z_VALUE)
if self.dynamic_z:
self.z_property = parameters[self.Z_VALUE]
return True
def isSupportedOutputValue(self, value, context):
output_path = QgsProcessingParameters.parameterAsOutputLayer(self, value, context)
if pathlib.Path(output_path).suffix.lower() != '.tif':
return False, QCoreApplication.translate("SAGAAlgorithm", 'Output filename must use a .tif extension')
return True, ''
def processAlgorithm(self, parameters, context, feedback):
source = self.parameterAsSource(parameters, self.INPUT, context)
expressionContext = self.createExpressionContext(
parameters, context, source)
x_expression = self.parameterAsString(parameters, self.XEXPRESSION,
context)
x_expression = QgsExpression(x_expression)
if x_expression.hasParserError():
x_expression.prepare(expressionContext)
raise QgsProcessingException(x_expression.parserErrorString())
y_expression = self.parameterAsString(parameters, self.YEXPRESSION,
context)
y_expression = QgsExpression(y_expression)
if y_expression.hasParserError():
y_expression.prepare(expressionContext)
raise QgsProcessingException(y_expression.parserErrorString())
size = self.parameterAsDouble(parameters, self.SIZE, context)
size_property = None
if QgsProcessingParameters.isDynamic(parameters, "SIZE"):
size_property = parameters["SIZE"]
color = self.parameterAsColor(parameters, self.COLOR, context)
color_property = None
if QgsProcessingParameters.isDynamic(parameters, "COLOR"):
color_property = parameters["COLOR"]
facet_row = self.parameterAsString(parameters, self.FACET_ROW, context)
facet_row_expression = QgsExpression(facet_row)
if facet_row and facet_row_expression.hasParserError():
facet_row_expression.prepare(expressionContext)
raise QgsProcessingException(
facet_row_expression.parserErrorString())
facet_col = self.parameterAsString(parameters, self.FACET_COL, context)
facet_col_expression = QgsExpression(facet_col)
if facet_col and facet_col_expression.hasParserError():
facet_col_expression.prepare(expressionContext)
raise QgsProcessingException(
facet_col_expression.parserErrorString())
offline = self.parameterAsBool(parameters, self.OFFLINE, context)
if offline is not True:
offline = 'cdn'
output_html = self.parameterAsFileOutput(parameters,
self.OUTPUT_HTML_FILE,
context)
output_json = self.parameterAsFileOutput(parameters,
self.OUTPUT_JSON_FILE,
context)
colnames = ['x', 'y', 'customdata']
data = []
request = QgsFeatureRequest()
request.setFlags(QgsFeatureRequest.NoGeometry)
for current, f in enumerate(source.getFeatures(request)):
tl = []
expressionContext.setFeature(f)
x_val = x_expression.evaluate(expressionContext)
y_val = y_expression.evaluate(expressionContext)
ids = f.id()
tl.append(x_val)
tl.append(y_val)
tl.append(ids)
if facet_row:
facet_row_val = facet_row_expression.evaluate(
expressionContext)
tl.append(facet_row_val)
if facet_col:
facet_col_val = facet_col_expression.evaluate(
expressionContext)
tl.append(facet_col_val)
if size_property:
the_size, _ = size_property.valueAsDouble(
expressionContext, size)
tl.append(the_size)
if color_property:
the_color, _ = color_property.value(expressionContext, color)
tl.append(the_color)
data.append(tl)
if facet_row:
colnames.append('facet_row')
if facet_col:
colnames.append('facet_col')
if size_property:
colnames.append('size')
if color_property:
colnames.append('color')
df = pd.DataFrame(data=data, columns=colnames)
feedback.pushDebugInfo(f'{df}')
fig = px.scatter(df,
x='x',
y='y',
size='size' if size_property else None,
color='color' if color_property else None,
facet_row="facet_row" if facet_row else None,
facet_col="facet_col" if facet_col else None)
if size_property is None:
fig.update_traces(marker_size=size)
if color_property is None:
fig.update_traces(marker_color=color.name())
fig.update_layout(showlegend=True)
results = {}
fig.write_html(output_html, include_plotlyjs=offline)
results[self.OUTPUT_HTML_FILE] = output_html
if output_json:
fig.write_json(output_json, pretty=True)
results[self.OUTPUT_JSON_FILE] = output_json
return results
def processAlgorithm(self, parameters, context, feedback):
source = self.parameterAsSource(parameters, self.INPUT, context)
if source is None:
raise QgsProcessingException(
self.invalidSourceError(parameters, self.INPUT))
strategy = self.parameterAsEnum(parameters, self.STRATEGY, context)
if self.MIN_DISTANCE in parameters and parameters[
self.MIN_DISTANCE] is not None:
minDistance = self.parameterAsDouble(parameters, self.MIN_DISTANCE,
context)
else:
minDistance = None
expressionContext = self.createExpressionContext(
parameters, context, source)
dynamic_value = QgsProcessingParameters.isDynamic(parameters, "VALUE")
value_property = None
if self.EXPRESSION in parameters and parameters[
self.EXPRESSION] is not None:
expression = QgsExpression(
self.parameterAsString(parameters, self.EXPRESSION, context))
value = None
if expression.hasParserError():
raise QgsProcessingException(expression.parserErrorString())
expression.prepare(expressionContext)
else:
expression = None
if dynamic_value:
value_property = parameters["VALUE"]
value = self.parameterAsDouble(parameters, self.VALUE, context)
fields = QgsFields()
fields.append(QgsField('id', QVariant.Int, '', 10, 0))
(sink,
dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
fields, QgsWkbTypes.Point,
source.sourceCrs(),
QgsFeatureSink.RegeneratePrimaryKey)
if sink is None:
raise QgsProcessingException(
self.invalidSinkError(parameters, self.OUTPUT))
da = QgsDistanceArea()
da.setSourceCrs(source.sourceCrs(), context.transformContext())
da.setEllipsoid(context.ellipsoid())
total = 100.0 / source.featureCount() if source.featureCount() else 0
current_progress = 0
pointId = 0
for current, f in enumerate(source.getFeatures()):
if feedback.isCanceled():
break
if not f.hasGeometry():
continue
current_progress = total * current
feedback.setProgress(current_progress)
this_value = value
if value_property is not None or expression is not None:
expressionContext.setFeature(f)
if value_property:
this_value, _ = value_property.valueAsDouble(
expressionContext, value)
else:
this_value = expression.evaluate(expressionContext)
if expression.hasEvalError():
feedback.pushInfo(
self.tr('Evaluation error for feature ID {}: {}').
format(f.id(), expression.evalErrorString()))
continue
fGeom = f.geometry()
engine = QgsGeometry.createGeometryEngine(fGeom.constGet())
engine.prepareGeometry()
bbox = fGeom.boundingBox()
if strategy == 0:
pointCount = int(this_value)
else:
pointCount = int(round(this_value * da.measureArea(fGeom)))
if pointCount == 0:
feedback.pushInfo(
"Skip feature {} as number of points for it is 0.".format(
f.id()))
continue
index = None
if minDistance:
index = QgsSpatialIndex()
points = dict()
nPoints = 0
nIterations = 0
maxIterations = pointCount * 200
feature_total = total / pointCount if pointCount else 1
random.seed()
while nIterations < maxIterations and nPoints < pointCount:
if feedback.isCanceled():
break
rx = bbox.xMinimum() + bbox.width() * random.random()
ry = bbox.yMinimum() + bbox.height() * random.random()
p = QgsPointXY(rx, ry)
geom = QgsGeometry.fromPointXY(p)
if engine.contains(geom.constGet()) and \
(not minDistance or vector.checkMinDistance(p, index, minDistance, points)):
f = QgsFeature(nPoints)
f.initAttributes(1)
f.setFields(fields)
f.setAttribute('id', pointId)
f.setGeometry(geom)
sink.addFeature(f, QgsFeatureSink.FastInsert)
if minDistance:
index.addFeature(f)
points[nPoints] = p
nPoints += 1
pointId += 1
feedback.setProgress(current_progress +
int(nPoints * feature_total))
nIterations += 1
if nPoints < pointCount:
feedback.pushInfo(
self.tr('Could not generate requested number of random '
'points. Maximum number of attempts exceeded.'))
feedback.setProgress(100)
return {self.OUTPUT: dest_id}
