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119 lines
5.0 KiB
Python
119 lines
5.0 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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OffsetLine.py
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--------------
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Date : July 2016
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Copyright : (C) 2016 by Nyall Dawson
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Email : nyall dot dawson 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__ = 'Nyall Dawson'
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__date__ = 'July 2016'
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__copyright__ = '(C) 2016, Nyall Dawson'
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# This will get replaced with a git SHA1 when you do a git archive323
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__revision__ = '$Format:%H$'
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import os
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from qgis.core import (QgsFeatureSink,
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QgsProcessing,
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QgsProcessingException,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterNumber,
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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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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class OffsetLine(QgisAlgorithm):
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INPUT = 'INPUT'
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OUTPUT = 'OUTPUT'
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DISTANCE = 'DISTANCE'
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SEGMENTS = 'SEGMENTS'
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JOIN_STYLE = 'JOIN_STYLE'
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MITRE_LIMIT = 'MITRE_LIMIT'
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def group(self):
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return self.tr('Vector geometry tools')
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def __init__(self):
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super().__init__()
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def initAlgorithm(self, config=None):
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self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT, self.tr('Input layer'),
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[QgsProcessing.TypeVectorLine]))
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self.addParameter(QgsProcessingParameterNumber(self.DISTANCE,
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self.tr('Distance'),
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type=QgsProcessingParameterNumber.Double,
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defaultValue=10.0))
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self.addParameter(QgsProcessingParameterNumber(self.SEGMENTS,
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self.tr('Segments'),
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type=QgsProcessingParameterNumber.Integer,
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minValue=1, defaultValue=8))
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self.join_styles = [self.tr('Round'),
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'Mitre',
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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))
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self.addParameter(QgsProcessingParameterNumber(self.MITRE_LIMIT,
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self.tr('Mitre limit'), type=QgsProcessingParameterNumber.Double,
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minValue=1, defaultValue=2))
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self.addParameter(
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QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Offset'), QgsProcessing.TypeVectorLine))
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def name(self):
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return 'offsetline'
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def displayName(self):
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return self.tr('Offset line')
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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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(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
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source.fields(), source.wkbType(), source.sourceCrs())
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distance = self.parameterAsDouble(parameters, self.DISTANCE, context)
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segments = self.parameterAsInt(parameters, self.SEGMENTS, context)
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join_style = self.parameterAsEnum(parameters, self.JOIN_STYLE, context) + 1
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miter_limit = self.parameterAsDouble(parameters, self.MITRE_LIMIT, context)
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features = source.getFeatures()
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total = 100.0 / source.featureCount() if source.featureCount() else 0
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for current, input_feature in enumerate(features):
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if feedback.isCanceled():
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break
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output_feature = input_feature
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input_geometry = input_feature.geometry()
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if input_geometry:
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output_geometry = input_geometry.offsetCurve(distance, segments, join_style, miter_limit)
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if not output_geometry:
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raise QgsProcessingException(
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self.tr('Error calculating line offset'))
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output_feature.setGeometry(output_geometry)
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sink.addFeature(output_feature, QgsFeatureSink.FastInsert)
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feedback.setProgress(int(current * total))
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return {self.OUTPUT: dest_id}
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