def mkGraduatedRenderer(layer,
fieldname,
color_ramp,
nb_classes=5,
classif_method=QgsGraduatedSymbolRenderer.Jenks):
# classif = QgsClassificationQuantile()
# classes = classif.classes(layer,fieldname,nb_classes)
renderer = QgsGraduatedSymbolRenderer(attrName=fieldname)
renderer.setSourceColorRamp(color_ramp)
renderer.updateClasses(layer, classif_method, nb_classes)
# renderer.setGraduatedMethod(QgsGraduatedSymbolRenderer.GraduatedColor)
# renderer.setClassificationMethod(classif)
return renderer
def btn_display_style_clicked(self):
style = self.cbo_display_style.currentText()
self.params.pipes_vlay.loadNamedStyle(
os.path.join(QML_FILEPATH, qml_files[style]['Pipes']))
self.params.junctions_vlay.loadNamedStyle(
os.path.join(QML_FILEPATH, qml_files[style]['Junctions']))
if style == 'Results': #TODO: soft code
renderer = QgsGraduatedSymbolRenderer()
renderer.updateClasses(self.params.junctions_vlay, renderer.Pretty,
8)
renderer.updateClasses(self.params.pipes_vlay, renderer.Pretty, 5)
self.params.pipes_vlay.triggerRepaint()
self.params.junctions_vlay.triggerRepaint()
def layerFromPath(lineFilePath: str, rootGroup: QgsLayerTreeGroup,
project: QgsLayerTreeGroup) -> None:
lineFileBasename = os.path.splitext(os.path.basename(lineFilePath))[0]
lineLayer = QgsVectorLayer(lineFilePath, lineFileBasename, 'ogr')
# Get number of features (range of Sequence#, number of renderer color classes)
driver = ogr.GetDriverByName('ESRI Shapefile')
dataSource = driver.Open(lineFilePath,
0) # 0 means read-only. 1 means writeable.
layer = dataSource.GetLayer()
dataSource = None
#Setup graduated color renderer based on year
targetField = 'Year'
renderer = QgsGraduatedSymbolRenderer('', [QgsRendererRange()])
renderer.setClassAttribute(targetField)
lineLayer.setRenderer(renderer)
#Get viridis color ramp
style = QgsStyle().defaultStyle()
defaultColorRampNames = style.colorRampNames()
viridisIndex = defaultColorRampNames.index('Viridis')
viridisColorRamp = style.colorRamp(
defaultColorRampNames[viridisIndex]) #Spectral color ramp
#Dynamically recalculate number of classes and colors
renderer.updateColorRamp(viridisColorRamp)
yearsRange = list(range(1972, 2020))
classCount = len(yearsRange)
renderer.updateClasses(lineLayer, QgsGraduatedSymbolRenderer.EqualInterval,
classCount)
#Set graduated color renderer based on Sequence#
for i in range(classCount): #[1972-2019], 2020 not included
targetField = 'DateUnix'
year = yearsRange[i]
renderer.updateRangeLowerValue(i, year)
renderer.updateRangeUpperValue(i, year)
project.addMapLayer(lineLayer, False)
rootGroup.insertLayer(0, lineLayer)
def testQgsGraduatedSymbolRenderer_3(self):
"""Test QgsGraduatedSymbolRenderer: Reading attribute data, calculating classes """
# Create a renderer
renderer = QgsGraduatedSymbolRenderer()
symbol = createMarkerSymbol()
renderer.setSourceSymbol(symbol.clone())
# Test retrieving data values from a layer
ml = createMemoryLayer((1.2, 0.5, 5.0, 1.0, 1.0, 1.2))
renderer.setClassAttribute("value")
# Equal interval calculations
renderer.updateClasses(ml, renderer.EqualInterval, 3)
self.assertEqual(dumpRangeBreaks(renderer.ranges()),
'(0.5000-2.0000,2.0000-3.5000,3.5000-5.0000,)',
'Equal interval classification not correct')
# Quantile classes
renderer.updateClasses(ml, renderer.Quantile, 3)
self.assertEqual(dumpRangeBreaks(renderer.ranges()),
'(0.5000-1.0000,1.0000-1.2000,1.2000-5.0000,)',
'Quantile classification not correct')
renderer.updateClasses(ml, renderer.Quantile, 4)
self.assertEqual(
dumpRangeBreaks(renderer.ranges()),
'(0.5000-1.0000,1.0000-1.1000,1.1000-1.2000,1.2000-5.0000,)',
'Quantile classification not correct')
def testQgsGraduatedSymbolRenderer_3(self):
"""Test QgsGraduatedSymbolRenderer: Reading attribute data, calculating classes """
# Create a renderer
renderer = QgsGraduatedSymbolRenderer()
symbol = createMarkerSymbol()
renderer.setSourceSymbol(symbol.clone())
# Test retrieving data values from a layer
ml = createMemoryLayer((1.2, 0.5, 5.0, 1.0, 1.0, 1.2))
renderer.setClassAttribute("value")
# Equal interval calculations
renderer.updateClasses(ml, renderer.EqualInterval, 3)
self.assertEqual(
dumpRangeBreaks(renderer.ranges()),
'(0.5000-2.0000,2.0000-3.5000,3.5000-5.0000,)',
'Equal interval classification not correct')
# Quantile classes
renderer.updateClasses(ml, renderer.Quantile, 3)
self.assertEqual(
dumpRangeBreaks(renderer.ranges()),
'(0.5000-1.0000,1.0000-1.2000,1.2000-5.0000,)',
'Quantile classification not correct')
renderer.updateClasses(ml, renderer.Quantile, 4)
self.assertEqual(
dumpRangeBreaks(renderer.ranges()),
'(0.5000-1.0000,1.0000-1.1000,1.1000-1.2000,1.2000-5.0000,)',
'Quantile classification not correct')
def testQgsGraduatedSymbolRenderer_3(self):
"""Test QgsGraduatedSymbolRenderer: Reading attribute data, calculating classes """
# Create a renderer
renderer = QgsGraduatedSymbolRenderer()
symbol = createMarkerSymbol()
renderer.setSourceSymbol(symbol.clone())
# Test retrieving data values from a layer
ml = createMemoryLayer((1.2, 0.5, 5.0, 1.0, 1.0, 1.2))
# ... by attribute
renderer.setClassAttribute("value")
self.assertEqual(renderer.classAttribute(), "value",
"Error in set/get classAttribute")
data = renderer.getDataValues(ml)
datastr = ':'.join([str(x) for x in data])
self.assertEqual(datastr, '1.2:0.5:5.0:1.0:1.0:1.2',
"Error returning field data")
# ... by expression
renderer.setClassAttribute('"value"*"value"')
self.assertEqual(renderer.classAttribute(), '"value"*"value"',
"Error in set/get classAttribute")
data = renderer.getDataValues(ml)
datastr = ':'.join([str(x) for x in data])
self.assertEqual(datastr, '1.44:0.25:25.0:1.0:1.0:1.44',
"Error returning field expression")
renderer.setClassAttribute("value")
# Equal interval calculations
renderer.updateClasses(ml, renderer.EqualInterval, 3)
self.assertEqual(dumpRangeBreaks(renderer.ranges()),
'(0.5000-2.0000,2.0000-3.5000,3.5000-5.0000,)',
'Equal interval classification not correct')
# Quantile classes
renderer.updateClasses(ml, renderer.Quantile, 3)
self.assertEqual(dumpRangeBreaks(renderer.ranges()),
'(0.5000-1.0000,1.0000-1.2000,1.2000-5.0000,)',
'Quantile classification not correct')
renderer.updateClasses(ml, renderer.Quantile, 4)
self.assertEqual(
dumpRangeBreaks(renderer.ranges()),
'(0.5000-1.0000,1.0000-1.1000,1.1000-1.2000,1.2000-5.0000,)',
'Quantile classification not correct')
def testQgsGraduatedSymbolRenderer_3(self):
"""Test QgsGraduatedSymbolRenderer: Reading attribute data, calculating classes """
# Create a renderer
renderer = QgsGraduatedSymbolRenderer()
symbol = createMarkerSymbol()
renderer.setSourceSymbol(symbol.clone())
# Test retrieving data values from a layer
ml = createMemoryLayer((1.2, 0.5, 5.0, 1.0, 1.0, 1.2))
# ... by attribute
renderer.setClassAttribute("value")
self.assertEqual(renderer.classAttribute(), "value", "Error in set/get classAttribute")
data = renderer.getDataValues(ml)
datastr = ':'.join([str(x) for x in data])
self.assertEqual(datastr, '1.2:0.5:5.0:1.0:1.0:1.2', "Error returning field data")
# ... by expression
renderer.setClassAttribute('"value"*"value"')
self.assertEqual(renderer.classAttribute(), '"value"*"value"', "Error in set/get classAttribute")
data = renderer.getDataValues(ml)
datastr = ':'.join([str(x) for x in data])
self.assertEqual(datastr, '1.44:0.25:25.0:1.0:1.0:1.44', "Error returning field expression")
renderer.setClassAttribute("value")
# Equal interval calculations
renderer.updateClasses(ml, renderer.EqualInterval, 3)
self.assertEqual(
dumpRangeBreaks(renderer.ranges()),
'(0.5000-2.0000,2.0000-3.5000,3.5000-5.0000,)',
'Equal interval classification not correct')
# Quantile classes
renderer.updateClasses(ml, renderer.Quantile, 3)
self.assertEqual(
dumpRangeBreaks(renderer.ranges()),
'(0.5000-1.0000,1.0000-1.2000,1.2000-5.0000,)',
'Quantile classification not correct')
renderer.updateClasses(ml, renderer.Quantile, 4)
self.assertEqual(
dumpRangeBreaks(renderer.ranges()),
'(0.5000-1.0000,1.0000-1.1000,1.1000-1.2000,1.2000-5.0000,)',
'Quantile classification not correct')
def style_maps(layer,
style_by,
iface,
output_type='damages-rlzs',
perils=None,
add_null_class=False,
render_higher_on_top=False,
repaint=True,
use_sgc_style=False):
symbol = QgsSymbol.defaultSymbol(layer.geometryType())
# see properties at:
# https://qgis.org/api/qgsmarkersymbollayerv2_8cpp_source.html#l01073
symbol.setOpacity(1)
if isinstance(symbol, QgsMarkerSymbol):
# do it only for the layer with points
symbol.symbolLayer(0).setStrokeStyle(Qt.PenStyle(Qt.NoPen))
style = get_style(layer, iface.messageBar())
# this is the default, as specified in the user settings
ramp = QgsGradientColorRamp(style['color_from'], style['color_to'])
style_mode = style['style_mode']
# in most cases, we override the user-specified setting, and use
# instead a setting that was required by scientists
if output_type in OQ_TO_LAYER_TYPES:
default_qgs_style = QgsStyle().defaultStyle()
default_color_ramp_names = default_qgs_style.colorRampNames()
if output_type in (
'damages-rlzs',
'avg_losses-rlzs',
'avg_losses-stats',
):
# options are EqualInterval, Quantile, Jenks, StdDev, Pretty
# jenks = natural breaks
if Qgis.QGIS_VERSION_INT < 31000:
style_mode = QgsGraduatedSymbolRenderer.Jenks
else:
style_mode = 'Jenks'
ramp_type_idx = default_color_ramp_names.index('Reds')
symbol.setColor(QColor(RAMP_EXTREME_COLORS['Reds']['top']))
inverted = False
elif (output_type in ('gmf_data', 'ruptures')
or (output_type == 'hmaps' and not use_sgc_style)):
# options are EqualInterval, Quantile, Jenks, StdDev, Pretty
# jenks = natural breaks
if output_type == 'ruptures':
if Qgis.QGIS_VERSION_INT < 31000:
style_mode = QgsGraduatedSymbolRenderer.Pretty
else:
style_mode = 'PrettyBreaks'
else:
if Qgis.QGIS_VERSION_INT < 31000:
style_mode = QgsGraduatedSymbolRenderer.EqualInterval
else:
style_mode = 'EqualInterval'
ramp_type_idx = default_color_ramp_names.index('Spectral')
inverted = True
symbol.setColor(QColor(RAMP_EXTREME_COLORS['Reds']['top']))
elif output_type == 'hmaps' and use_sgc_style:
# FIXME: for SGC they were using size 10000 map units
# options are EqualInterval, Quantile, Jenks, StdDev, Pretty
# jenks = natural breaks
if Qgis.QGIS_VERSION_INT < 31000:
style_mode = QgsGraduatedSymbolRenderer.Pretty
else:
style_mode = 'PrettyBreaks'
try:
ramp_type_idx = default_color_ramp_names.index(
'SGC_Green2Red_Hmap_Color_Ramp')
except ValueError:
raise ValueError(
'Color ramp SGC_Green2Red_Hmap_Color_Ramp was '
'not found. Please import it from '
'Settings -> Style Manager, loading '
'svir/resources/sgc_green2red_hmap_color_ramp.xml')
inverted = False
registry = QgsApplication.symbolLayerRegistry()
symbol_props = {
'name': 'square',
'color': '0,0,0',
'color_border': '0,0,0',
'offset': '0,0',
'size': '1.5', # FIXME
'angle': '0',
}
square = registry.symbolLayerMetadata(
"SimpleMarker").createSymbolLayer(symbol_props)
symbol = QgsSymbol.defaultSymbol(layer.geometryType()).clone()
symbol.deleteSymbolLayer(0)
symbol.appendSymbolLayer(square)
symbol.symbolLayer(0).setStrokeStyle(Qt.PenStyle(Qt.NoPen))
elif output_type in ['asset_risk', 'input']:
# options are EqualInterval, Quantile, Jenks, StdDev, Pretty
# jenks = natural breaks
if Qgis.QGIS_VERSION_INT < 31000:
style_mode = QgsGraduatedSymbolRenderer.EqualInterval
else:
style_mode = 'EqualInterval'
# exposure_strings = ['number', 'occupants', 'value']
# setting exposure colors by default
colors = {
'single': RAMP_EXTREME_COLORS['Blues']['top'],
'ramp_name': 'Blues'
}
inverted = False
if output_type == 'asset_risk':
damage_strings = perils
for damage_string in damage_strings:
if damage_string in style_by:
colors = {
'single':
RAMP_EXTREME_COLORS['Spectral']['top'],
'ramp_name': 'Spectral'
}
inverted = True
break
else: # 'input'
colors = {
'single': RAMP_EXTREME_COLORS['Greens']['top'],
'ramp_name': 'Greens'
}
symbol.symbolLayer(0).setShape(
QgsSimpleMarkerSymbolLayerBase.Square)
single_color = colors['single']
ramp_name = colors['ramp_name']
ramp_type_idx = default_color_ramp_names.index(ramp_name)
symbol.setColor(QColor(single_color))
else:
raise NotImplementedError(
'Undefined color ramp for output type %s' % output_type)
ramp = default_qgs_style.colorRamp(
default_color_ramp_names[ramp_type_idx])
if inverted:
ramp.invert()
# get unique values
fni = layer.fields().indexOf(style_by)
unique_values = layer.dataProvider().uniqueValues(fni)
num_unique_values = len(unique_values - {NULL})
if num_unique_values > 2:
if Qgis.QGIS_VERSION_INT < 31000:
renderer = QgsGraduatedSymbolRenderer.createRenderer(
layer, style_by, min(num_unique_values, style['classes']),
style_mode, symbol.clone(), ramp)
else:
renderer = QgsGraduatedSymbolRenderer(style_by, [])
# NOTE: the following returns an instance of one of the
# subclasses of QgsClassificationMethod
classification_method = \
QgsApplication.classificationMethodRegistry().method(
style_mode)
renderer.setClassificationMethod(classification_method)
renderer.updateColorRamp(ramp)
renderer.updateSymbols(symbol.clone())
renderer.updateClasses(
layer, min(num_unique_values, style['classes']))
if not use_sgc_style:
if Qgis.QGIS_VERSION_INT < 31000:
label_format = renderer.labelFormat()
# NOTE: the following line might be useful
# label_format.setTrimTrailingZeroes(True)
label_format.setPrecision(2)
renderer.setLabelFormat(label_format, updateRanges=True)
else:
renderer.classificationMethod().setLabelPrecision(2)
renderer.calculateLabelPrecision()
elif num_unique_values == 2:
categories = []
for unique_value in unique_values:
symbol = symbol.clone()
try:
symbol.setColor(
QColor(RAMP_EXTREME_COLORS[ramp_name]
['bottom' if unique_value ==
min(unique_values) else 'top']))
except Exception:
symbol.setColor(
QColor(style['color_from'] if unique_value ==
min(unique_values) else style['color_to']))
category = QgsRendererCategory(unique_value, symbol,
str(unique_value))
# entry for the list of category items
categories.append(category)
renderer = QgsCategorizedSymbolRenderer(style_by, categories)
else:
renderer = QgsSingleSymbolRenderer(symbol.clone())
if add_null_class and NULL in unique_values:
# add a class for NULL values
rule_renderer = QgsRuleBasedRenderer(symbol.clone())
root_rule = rule_renderer.rootRule()
not_null_rule = root_rule.children()[0].clone()
# strip parentheses from stringified color HSL
not_null_rule.setFilterExpression(
'%s IS NOT NULL' % QgsExpression.quotedColumnRef(style_by))
not_null_rule.setLabel('%s:' % style_by)
root_rule.appendChild(not_null_rule)
null_rule = root_rule.children()[0].clone()
null_rule.setSymbol(
QgsFillSymbol.createSimple({
'color': '160,160,160',
'style': 'diagonal_x'
}))
null_rule.setFilterExpression(
'%s IS NULL' % QgsExpression.quotedColumnRef(style_by))
null_rule.setLabel(tr('No points'))
root_rule.appendChild(null_rule)
if isinstance(renderer, QgsGraduatedSymbolRenderer):
# create value ranges
rule_renderer.refineRuleRanges(not_null_rule, renderer)
# remove default rule
elif isinstance(renderer, QgsCategorizedSymbolRenderer):
rule_renderer.refineRuleCategoris(not_null_rule, renderer)
for rule in rule_renderer.rootRule().children()[1].children():
label = rule.label()
# by default, labels are like:
# ('"collapse-structural-ASH_DRY_sum" >= 0.0000 AND
# "collapse-structural-ASH_DRY_sum" <= 2.3949')
first, second = label.split(" AND ")
bottom = first.rsplit(" ", 1)[1]
top = second.rsplit(" ", 1)[1]
simplified = "%s - %s" % (bottom, top)
rule.setLabel(simplified)
root_rule.removeChildAt(0)
renderer = rule_renderer
if render_higher_on_top:
renderer.setUsingSymbolLevels(True)
symbol_items = [item for item in renderer.legendSymbolItems()]
for i in range(len(symbol_items)):
sym = symbol_items[i].symbol().clone()
key = symbol_items[i].ruleKey()
for lay in range(sym.symbolLayerCount()):
sym.symbolLayer(lay).setRenderingPass(i)
renderer.setLegendSymbolItem(key, sym)
layer.setRenderer(renderer)
if not use_sgc_style:
layer.setOpacity(0.7)
if repaint:
layer.triggerRepaint()
iface.setActiveLayer(layer)
iface.zoomToActiveLayer()
# NOTE QGIS3: probably not needed
# iface.layerTreeView().refreshLayerSymbology(layer.id())
iface.mapCanvas().refresh()
class LayerBase(QgsVectorLayer):
"""QGIS layer base class (read-only memory based).
:param fileName: path to input file
:param storageFormat: storage format for layer (Memory or SQLite)
"""
def __init__(self, fileName, storageFormat):
self._fileName = fileName
self._layerName = os.path.splitext(os.path.basename(self._fileName))[0]
self.storageFormat = storageFormat
# create point layer (WGS-84, EPSG:4326)
super(LayerBase, self).__init__('Point?crs=epsg:4326', self._layerName,
"memory")
self._aliases = [] # list of attribute aliases
self._provider = self.dataProvider()
# import errors
self._errs = {}
# layer is empty, no data loaded
self._loaded = False
self.metadata = None
# layer type not defined
self.layerType = None
# style
self._style = Style()
self._renderer = None
def load(self, reader):
"""Load input data by specified reader.
:param reader: reader class used for reading input data
"""
if self._loaded:
return # data already loaded
# create progress bar widget
progressMessageBar = iface.messageBar().createMessage(
self.tr("Loading data..."))
progress = QtWidgets.QProgressBar()
progress.setMaximum(100)
progressMessageBar.layout().addWidget(progress)
iface.messageBar().pushWidget(progressMessageBar, Qgis.Info)
# load items as new point features (inform user about progress)
i = 0
count = reader.count()
start = time.clock()
prev = None # previous feature
self.startEditing()
for item in reader:
i += 1
if i == 1 and not self._aliases:
# set attributes from data item if needed
self._aliases = self._setAttrbsDefs(
limit=item.keys(), defs=reader.attributeDefs())
feat = self._item2feat(item)
if not feat:
# error appeared
continue
feat.setId(i)
self.addFeature(feat)
if i % 100 == 0:
percent = i / float(count) * 100
progress.setValue(percent)
# add features (attributes recalculated if requested)
self.commitChanges()
if self.storageFormat != "memory":
self._writeToOgrDataSource()
self.reload()
# finish import
endtime = time.clock() - start
progress.setValue(100)
iface.messageBar().clearWidgets()
if self._errs:
# report errors if any
iface.messageBar().pushMessage(
self.tr("Info"),
self.
tr("{} invalid measurement(s) skipped (see message log for details)"
).format(sum(self._errs.values())),
level=Qgis.Info,
duration=5)
for attr in list(self._errs.keys()):
QgsMessageLog.logMessage(
"{}: {} measurement(s) skipped (invalid {})".format(
self._fileName, self._errs[attr], attr),
tag=PLUGIN_NAME)
# inform user about successful import
iface.messageBar().pushMessage(
self.tr("Data loaded"),
self.tr("{} features loaded (in {:.2f} sec).").format(
self.featureCount(), endtime),
level=Qgis.Success,
duration=3)
# data loaded (avoid multiple imports)
self._loaded = True
# switch to read-only mode
self.setReadOnly(True)
def _writeToOgrDataSource(self):
fileExt = self.storageFormat.lower()
filePath = os.path.splitext(self._fileName)[0] + '.{}'.format(fileExt)
writer, msg = QgsVectorFileWriter.writeAsVectorFormat(
self,
filePath,
self._provider.encoding(),
self._provider.crs(),
driverName=self.storageFormat)
if writer != QgsVectorFileWriter.NoError:
raise LoadError(
self.tr("Unable to create SQLite datasource: {}").format(msg))
# set datasource to new OGR datasource
self.setDataSource(filePath, self._layerName, 'ogr')
self._provider = self.dataProvider()
# create metadata layer
if self.metadata and 'table' in self.metadata:
ds = ogr.Open(filePath, True)
layer_name = self.metadata['table']
layer = ds.GetLayerByName(layer_name)
if layer is None:
layer = ds.CreateLayer(layer_name, None, ogr.wkbNone)
layer_defn = layer.GetLayerDefn()
if 'columns' in self.metadata:
for key in self.metadata['columns']:
field = ogr.FieldDefn(key, ogr.OFTString)
layer.CreateField(field)
feat = ogr.Feature(layer_defn)
for key, value in list(self.metadata['columns'].items()):
feat.SetField(key, value)
layer.CreateFeature(feat)
feat = None
def _addError(self, etype):
"""Add error message.
:param etype: error type (HDOP, SAT, ...)
"""
if etype not in self._errs:
self._errs[etype] = 0
self._errs[etype] += 1
def _item2feat(self, item):
"""Create QgsFeature from data item.
"""
raise NotImplementedError()
def _setAttrbsDefs(self, limit=[], defs=None):
"""Set attributes definition from CSV file if available.
:param limit: limit to list of attributes
:returns: list of aliases
"""
def addAttribute(row, attrbs, aliases):
attrbs.append(
QgsField(row['attribute'],
eval("QVariant.{}".format(row['qtype']))))
if 'alias' in row and row['alias']:
aliases.append(row['alias'].replace('_', ' '))
def processAttributes(csv_attrbs, limit):
attrbs = []
aliases = []
if limit:
# limit attributes based on input file (first feature) - ERS/PEI format specific
for name in limit:
# first try full name match
found = False
for row in csv_attrbs:
if row['attribute'] == name:
addAttribute(row, attrbs, aliases)
found = True
break
if found:
continue
for row in csv_attrbs:
# full name match is not required see
# https://gitlab.com/opengeolabs/qgis-radiation-toolbox-plugin/issues/41#note_136183930
if row['attribute'] == name[:len(
row['attribute']
)] or name == row['attribute'][:len(name)]:
row_modified = copy.copy(row)
row_modified[
'attribute'] = name # force (full) attribute name from input file
if row_modified['alias']:
row_modified['alias'] = '{} ({})'.format(
name, row_modified['alias'])
addAttribute(row_modified, attrbs, aliases)
break
else:
# add all attributes
for row in csv_attrbs:
addAttribute(row, attrbs, aliases)
return attrbs, aliases
if not defs:
# predefined attributes (CSV file)
# Safecast, ERS
csv_file = self._attributesCSVFile()
if not os.path.exists(csv_file):
return []
with open(csv_file) as fd:
csv_attrbs = list(csv.DictReader(fd, delimiter=';'))
attrbs, aliases = processAttributes(csv_attrbs, limit)
else:
# data-driven attributes
# PEI
attrbs, aliases = processAttributes(defs, limit)
if limit and len(attrbs) != len(limit):
raise LoadError("Number of attributes differs {} vs {}".format(
len(attrbs), len(limit)))
if aliases and self.storageFormat != "memory":
aliases.insert(0, "FID")
# set attributes
self._provider.addAttributes(attrbs)
self.updateFields()
return aliases
def setAliases(self):
"""Set aliases
"""
for i in range(0, len(self._aliases)):
self.setFieldAlias(i, self._aliases[i])
def setStyle(self, idx):
"""Set layer style.
:param int idx: style (combobox) index
"""
try:
style = self._style[idx]
except (IndexError, KeyError):
return None
if 'file' in style:
# QML style
stylePath = style['file']
if not os.path.isfile(stylePath):
raise StyleError(
self.tr("Style '{}' not found").format(stylePath))
self.loadNamedStyle(stylePath)
elif 'colorramp' in style:
if not self._renderer:
# symbol (store transparent)
symbol = QgsSymbol.defaultSymbol(self.geometryType())
symbol.symbolLayer(0).setStrokeColor(QColor("transparent"))
# renderer
self._renderer = QgsGraduatedSymbolRenderer()
self._renderer.setSourceSymbol(symbol)
print(self._renderer.sourceSymbol())
self._renderer.setClassAttribute(style['attribute'])
self._renderer.setMode(
QgsGraduatedSymbolRenderer.EqualInterval)
self._renderer.updateClasses(
self, QgsGraduatedSymbolRenderer.EqualInterval,
style['classes'])
self.setRenderer(self._renderer)
self._renderer.updateColorRamp(style['colorramp'])
else:
raise StyleError(self.tr("Undefined style"))
def style(self):
"""Get style.
:return: style class
"""
return self._style
def _attributesCSVFile(self):
return os.path.join(
os.path.dirname(__file__),
os.path.splitext(inspect.getfile(self.__class__))[0] + '.csv')