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133 lines
5.7 KiB
Python
133 lines
5.7 KiB
Python
"""
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***************************************************************************
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VariableDistanceBuffer.py
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---------------------
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Date : August 2012
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Copyright : (C) 2012 by Victor Olaya
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Email : volayaf at gmail dot com
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************
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"""
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__author__ = 'Victor Olaya'
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__date__ = 'August 2012'
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__copyright__ = '(C) 2012, Victor Olaya'
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import os
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from qgis.PyQt.QtGui import QIcon
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from qgis.core import (QgsApplication,
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QgsWkbTypes,
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QgsProcessing,
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QgsProcessingException,
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QgsProcessingAlgorithm,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterField,
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QgsProcessingParameterNumber,
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QgsProcessingParameterBoolean,
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QgsProcessingParameterEnum,
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QgsProcessingParameterFeatureSink)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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from . import Buffer as buff
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class VariableDistanceBuffer(QgisAlgorithm):
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INPUT = 'INPUT'
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OUTPUT = 'OUTPUT'
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FIELD = 'FIELD'
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SEGMENTS = 'SEGMENTS'
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DISSOLVE = 'DISSOLVE'
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END_CAP_STYLE = 'END_CAP_STYLE'
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JOIN_STYLE = 'JOIN_STYLE'
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MITER_LIMIT = 'MITER_LIMIT'
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def icon(self):
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return QgsApplication.getThemeIcon("/algorithms/mAlgorithmBuffer.svg")
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def svgIconPath(self):
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return QgsApplication.iconPath("/algorithms/mAlgorithmBuffer.svg")
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def group(self):
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return self.tr('Vector geometry')
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def groupId(self):
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return 'vectorgeometry'
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def __init__(self):
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super().__init__()
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def flags(self):
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return QgsProcessingAlgorithm.Flag.FlagSupportsBatch | QgsProcessingAlgorithm.Flag.FlagCanCancel | QgsProcessingAlgorithm.Flag.FlagDeprecated
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def initAlgorithm(self, config=None):
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self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
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self.tr('Input layer')))
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self.addParameter(QgsProcessingParameterField(self.FIELD,
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self.tr('Distance field'), parentLayerParameterName=self.INPUT))
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self.addParameter(QgsProcessingParameterNumber(self.SEGMENTS,
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self.tr('Segments'), type=QgsProcessingParameterNumber.Type.Integer,
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minValue=1, defaultValue=5))
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self.addParameter(QgsProcessingParameterBoolean(self.DISSOLVE,
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self.tr('Dissolve result'), defaultValue=False))
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self.end_cap_styles = [self.tr('Round'),
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'Flat',
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'Square']
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self.addParameter(QgsProcessingParameterEnum(
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self.END_CAP_STYLE,
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self.tr('End cap style'),
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options=self.end_cap_styles, defaultValue=0))
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self.join_styles = [self.tr('Round'),
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'Miter',
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'Bevel']
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self.addParameter(QgsProcessingParameterEnum(
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self.JOIN_STYLE,
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self.tr('Join style'),
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options=self.join_styles, defaultValue=0))
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self.addParameter(QgsProcessingParameterNumber(self.MITER_LIMIT,
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self.tr('Miter limit'), type=QgsProcessingParameterNumber.Type.Double,
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minValue=0, defaultValue=2))
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self.addParameter(
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QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Buffer'), QgsProcessing.SourceType.TypeVectorPolygon))
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def name(self):
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return 'variabledistancebuffer'
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def displayName(self):
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return self.tr('Variable distance buffer')
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def processAlgorithm(self, parameters, context, feedback):
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source = self.parameterAsSource(parameters, self.INPUT, context)
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if source is None:
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raise QgsProcessingException(self.invalidSourceError(parameters, self.INPUT))
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dissolve = self.parameterAsBoolean(parameters, self.DISSOLVE, context)
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segments = self.parameterAsInt(parameters, self.SEGMENTS, context)
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end_cap_style = self.parameterAsEnum(parameters, self.END_CAP_STYLE, context) + 1
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join_style = self.parameterAsEnum(parameters, self.JOIN_STYLE, context) + 1
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miter_limit = self.parameterAsDouble(parameters, self.MITER_LIMIT, context)
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field = self.parameterAsString(parameters, self.FIELD, context)
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(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
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source.fields(), QgsWkbTypes.Type.Polygon, source.sourceCrs())
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if sink is None:
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raise QgsProcessingException(self.invalidSinkError(parameters, self.OUTPUT))
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buff.buffering(feedback, context, sink, 0, field, True, source, dissolve, segments, end_cap_style,
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join_style, miter_limit)
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sink.finalize()
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return {self.OUTPUT: dest_id}
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