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styledpolyvectordensity.py
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styledpolyvectordensity.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.QtCore import QUrl
from qgis.PyQt.QtGui import QIcon
from qgis.core import Qgis
from qgis.core import (
QgsProcessing,
QgsProcessingAlgorithm,
QgsProcessingParameterBoolean,
QgsProcessingParameterEnum,
QgsProcessingParameterField,
QgsProcessingParameterVectorLayer,
QgsProcessingParameterNumber,
QgsProcessingParameterString,
QgsProcessingParameterDefinition,
QgsProcessingParameterFeatureSink
)
import processing
from .settings import settings, COLOR_RAMP_MODE
class StyledPolygonVectorDensityAlgorithm(QgsProcessingAlgorithm):
def initAlgorithm(self, config=None):
self.addParameter(
QgsProcessingParameterVectorLayer('INPUT', 'Input polygon layer',
[QgsProcessing.TypeVectorPolygon ],
optional=False
)
)
self.addParameter(
QgsProcessingParameterField(
'UNIQUEID',
'Unique ID field for list of contributing source polygons',
parentLayerParameterName='INPUT',
type=QgsProcessingParameterField.Any,
optional=True
)
)
self.addParameter(
QgsProcessingParameterNumber('FILTER', 'Keep polygons with overlap counts >= to this',
type=QgsProcessingParameterNumber.Integer, defaultValue=1, minValue=1, 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)
)
param = QgsProcessingParameterNumber(
'CLASSES',
'Number of gradient colors',
QgsProcessingParameterNumber.Integer,
defaultValue=settings.num_ramp_classes,
minValue=2,
optional=False)
param.setFlags(param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
self.addParameter(param)
param = QgsProcessingParameterEnum(
'COLOR_RAMP_MODE',
'Color ramp mode',
options=COLOR_RAMP_MODE,
defaultValue=settings.color_ramp_mode,
optional=False)
param.setFlags(param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
self.addParameter(param)
param = QgsProcessingParameterBoolean(
'NO_OUTLINE',
'No feature outlines',
True,
optional=False)
param.setFlags(param.flags() | QgsProcessingParameterDefinition.FlagAdvanced)
self.addParameter(param)
self.addParameter(
QgsProcessingParameterFeatureSink('OUTPUT', 'Output polygon density',
type=QgsProcessing.TypeVectorPolygon, createByDefault=True, defaultValue=None, optional=False)
)
def processAlgorithm(self, parameters, context, feedback):
layer = self.parameterAsLayer(parameters, 'INPUT', context)
if 'UNIQUEID' in parameters and parameters['UNIQUEID']:
unique_id = True
unique_id_field = self.parameterAsString(parameters, 'UNIQUEID', context)
else:
unique_id = False
filter = self.parameterAsInt(parameters, 'FILTER', context)
num_classes = self.parameterAsInt(parameters, 'CLASSES', context)
if Qgis.QGIS_VERSION_INT >= 32200:
# In this case ramp_name will be the name
ramp_name = self.parameterAsString(parameters, 'RAMP_NAMES', context)
else:
# In this case ramp_name will be an index into ramp_names
ramp_name = self.parameterAsEnum(parameters, 'RAMP_NAMES', context)
ramp_mode = self.parameterAsInt(parameters, 'COLOR_RAMP_MODE', context)
no_outline = self.parameterAsBool(parameters, 'NO_OUTLINE', context)
invert = self.parameterAsBool(parameters, 'INVERT', context)
results = {}
outputs = {}
alg_params = {
'INPUT': parameters['INPUT'],
'FILTER': filter,
'OUTPUT': parameters['OUTPUT']
}
if unique_id:
alg_params['UNIQUEID'] = unique_id_field
outputs['PolyVectorDensity'] = processing.run('densityanalysis:polygonvectordensity', alg_params, context=context, feedback=feedback, is_child_algorithm=True)
results['OUTPUT'] = outputs['PolyVectorDensity']['OUTPUT']
if feedback.isCanceled():
return {}
# Apply a graduated style
alg_params = {
'NO_OUTLINE': no_outline,
'INVERT': invert,
'CLASSES': num_classes,
'GROUP_FIELD': 'NUMPOINTS',
'INPUT': outputs['PolyVectorDensity']['OUTPUT'],
'MODE': ramp_mode,
'RAMP_NAMES': ramp_name
}
processing.run('densityanalysis:graduatedstyle', alg_params, context=context, feedback=feedback, is_child_algorithm=True)
return results
def group(self):
return 'Polygon density (vector)'
def groupId(self):
return 'polygondensity'
def name(self):
return 'styledpolygonvectordensity'
def displayName(self):
return 'Styled polygon density (vector)'
def icon(self):
return QIcon(os.path.join(os.path.dirname(__file__), 'icons/vecpolydensity.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 shortHelpString(self):
file = os.path.dirname(__file__) + '/help/polygondensityvector.help'
if not os.path.exists(file):
return ''
with open(file) as helpf:
help = helpf.read()
return help
def createInstance(self):
return StyledPolygonVectorDensityAlgorithm()