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graduatedstyle.py
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graduatedstyle.py
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"""
/***************************************************************************
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
***************************************************************************/
"""
import os
from qgis.PyQt.QtGui import QIcon
from qgis.PyQt.QtCore import Qt, QUrl
from qgis.core import Qgis, QgsStyle, QgsSymbol, QgsGraduatedSymbolRenderer, QgsClassificationLogarithmic
from qgis.core import (
QgsProcessing,
QgsProcessingAlgorithm,
QgsProcessingParameterBoolean,
QgsProcessingParameterEnum,
QgsProcessingParameterNumber,
QgsProcessingParameterString,
QgsProcessingParameterVectorLayer,
QgsProcessingParameterField)
import processing
from .settings import settings, COLOR_RAMP_MODE
class GraduatedStyleAlgorithm(QgsProcessingAlgorithm):
def initAlgorithm(self, config=None):
self.addParameter(
QgsProcessingParameterVectorLayer(
'INPUT', 'Input map layer', [QgsProcessing.TypeVectorAnyGeometry ])
)
self.addParameter(
QgsProcessingParameterField(
'GROUP_FIELD',
'Field used for styling',
parentLayerParameterName='INPUT',
type=QgsProcessingParameterField.Any,
defaultValue='NUMPOINTS',
optional=False)
)
if Qgis.QGIS_VERSION_INT >= 32200:
ramp_name_param = QgsProcessingParameterString('RAMP_NAMES', 'Select color ramp', defaultValue=settings.defaultColorRamp())
ramp_name_param.setMetadata( {'widget_wrapper': {'value_hints': settings.ramp_names } } )
else:
ramp_name_param = QgsProcessingParameterEnum(
'RAMP_NAMES',
'Select color ramp',
options=settings.ramp_names,
defaultValue=settings.defaultColorRampIndex(),
optional=False)
self.addParameter(ramp_name_param)
self.addParameter(
QgsProcessingParameterBoolean(
'INVERT',
'Invert color ramp',
False,
optional=False)
)
self.addParameter(
QgsProcessingParameterNumber(
'CLASSES',
'Number of gradient colors',
QgsProcessingParameterNumber.Integer,
defaultValue=settings.num_ramp_classes,
minValue=2,
optional=False)
)
self.addParameter(
QgsProcessingParameterEnum(
'MODE',
'Color ramp mode',
options=COLOR_RAMP_MODE,
defaultValue=settings.color_ramp_mode,
optional=False)
)
self.addParameter(
QgsProcessingParameterBoolean(
'NO_OUTLINE',
'No feature outlines',
True,
optional=False)
)
def processAlgorithm(self, parameters, context, feedback):
layer = self.parameterAsVectorLayer(parameters, 'INPUT', context)
attr = self.parameterAsString(parameters, 'GROUP_FIELD', context)
if Qgis.QGIS_VERSION_INT >= 32200:
ramp_name = self.parameterAsString(parameters, 'RAMP_NAMES', context)
else:
ramp_name = settings.ramp_names[self.parameterAsEnum(parameters, 'RAMP_NAMES', context)]
mode = self.parameterAsInt(parameters, 'MODE', context)
num_classes = self.parameterAsInt(parameters, 'CLASSES', context)
no_outline = self.parameterAsBool(parameters, 'NO_OUTLINE', context)
invert = self.parameterAsBool(parameters, 'INVERT', context)
if mode == 0: # Quantile
grad_mode = QgsGraduatedSymbolRenderer.Quantile
elif mode == 1: # Equal Interval
grad_mode = QgsGraduatedSymbolRenderer.EqualInterval
elif mode == 2: # Logarithmic scale
grad_mode = QgsGraduatedSymbolRenderer.Quantile
elif mode == 3: # Natural Breaks (Jenks)
grad_mode = QgsGraduatedSymbolRenderer.Jenks
elif mode == 4: # Pretty Breaks
grad_mode = QgsGraduatedSymbolRenderer.Pretty
elif mode == 5: # Standard Deviation
grad_mode = QgsGraduatedSymbolRenderer.StdDev
geomtype = layer.geometryType()
symbol = QgsSymbol.defaultSymbol(geomtype)
if no_outline:
symbol.symbolLayer(0).setStrokeStyle(Qt.PenStyle(Qt.NoPen))
style = QgsStyle.defaultStyle()
ramp = style.colorRamp(ramp_name)
if invert:
ramp.invert()
new_renderer = QgsGraduatedSymbolRenderer.createRenderer(
layer, # The layer
attr, # Attribute name
num_classes, # Number of classes
grad_mode, # Mode
symbol, # QgsSymbol
ramp # Our color ramp
)
if mode == 2:
new_renderer.setClassificationMethod(QgsClassificationLogarithmic())
new_renderer.updateClasses(layer, num_classes)
layer.setRenderer(new_renderer)
# feedback.pushInfo('dump: {}'.format(new_renderer.dump()))
# new_renderer.updateClasses(layer, num_classes)
layer.triggerRepaint()
return({})
def group(self):
return 'Styles'
def groupId(self):
return 'styles'
def name(self):
return 'graduatedstyle'
def displayName(self):
return 'Apply graduated style'
def icon(self):
return QIcon(os.path.join(os.path.dirname(__file__), 'icons/gradient.png'))
def helpUrl(self):
file = os.path.dirname(__file__) + '/index.html'
if not os.path.exists(file):
return ''
return QUrl.fromLocalFile(file).toString(QUrl.FullyEncoded)
def createInstance(self):
return GraduatedStyleAlgorithm()