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84 lines
3.0 KiB
Python
84 lines
3.0 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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ExtendLines.py
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--------------------
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Date : October 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__ = 'October 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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from qgis.core import (QgsProcessingParameterDistance,
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QgsProcessingException,
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QgsProcessing)
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from processing.algs.qgis.QgisAlgorithm import QgisFeatureBasedAlgorithm
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class ExtendLines(QgisFeatureBasedAlgorithm):
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START_DISTANCE = 'START_DISTANCE'
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END_DISTANCE = 'END_DISTANCE'
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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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self.start_distance = None
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self.end_distance = None
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def initParameters(self, config=None):
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self.addParameter(QgsProcessingParameterDistance(self.START_DISTANCE,
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self.tr('Start distance'), defaultValue=0.0, parentParameterName='INPUT'))
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self.addParameter(QgsProcessingParameterDistance(self.END_DISTANCE,
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self.tr('End distance'), defaultValue=0.0, parentParameterName='INPUT'))
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def name(self):
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return 'extendlines'
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def displayName(self):
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return self.tr('Extend lines')
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def outputName(self):
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return self.tr('Extended')
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def inputLayerTypes(self):
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return [QgsProcessing.TypeVectorLine]
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def prepareAlgorithm(self, parameters, context, feedback):
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self.start_distance = self.parameterAsDouble(parameters, self.START_DISTANCE, context)
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self.end_distance = self.parameterAsDouble(parameters, self.END_DISTANCE, context)
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return True
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def processFeature(self, feature, context, feedback):
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input_geometry = feature.geometry()
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if input_geometry:
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output_geometry = input_geometry.extendLine(self.start_distance, self.end_distance)
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if not output_geometry:
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raise QgsProcessingException(
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self.tr('Error calculating extended line'))
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feature.setGeometry(output_geometry)
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return [feature]
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