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377b181c4e
Also - simplify and add tests - remove large memory leak (persistant store of all non-project layers) - remove broken support for direct loading postgres/virtual layers by string (Python version was very broken and would never match a postgres/virtual layer)
99 lines
3.7 KiB
Python
99 lines
3.7 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 (QgsApplication)
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from processing.core.parameters import ParameterVector, ParameterNumber
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from processing.core.outputs import OutputVector
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from processing.tools import dataobjects, vector
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class ExtendLines(GeoAlgorithm):
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INPUT_LAYER = 'INPUT_LAYER'
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OUTPUT_LAYER = 'OUTPUT_LAYER'
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START_DISTANCE = 'START_DISTANCE'
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END_DISTANCE = 'END_DISTANCE'
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def icon(self):
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return QgsApplication.getThemeIcon("/providerQgis.svg")
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def svgIconPath(self):
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return QgsApplication.iconPath("providerQgis.svg")
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def group(self):
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return self.tr('Vector geometry tools')
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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 defineCharacteristics(self):
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self.addParameter(ParameterVector(self.INPUT_LAYER,
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self.tr('Input layer'), [dataobjects.TYPE_VECTOR_LINE]))
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self.addParameter(ParameterNumber(self.START_DISTANCE,
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self.tr('Start distance'), default=0.0))
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self.addParameter(ParameterNumber(self.END_DISTANCE,
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self.tr('End distance'), default=0.0))
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self.addOutput(OutputVector(self.OUTPUT_LAYER, self.tr('Extended lines')))
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def processAlgorithm(self, feedback):
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layer = dataobjects.getLayerFromString(
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self.getParameterValue(self.INPUT_LAYER))
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writer = self.getOutputFromName(
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self.OUTPUT_LAYER).getVectorWriter(
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layer.fields(),
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layer.wkbType(),
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layer.crs())
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start_distance = self.getParameterValue(self.START_DISTANCE)
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end_distance = self.getParameterValue(self.END_DISTANCE)
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features = vector.features(layer)
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total = 100.0 / len(features)
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for current, input_feature in enumerate(features):
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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.extendLine(start_distance, end_distance)
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if not output_geometry:
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raise GeoAlgorithmExecutionException(
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self.tr('Error calculating extended line'))
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output_feature.setGeometry(output_geometry)
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writer.addFeature(output_feature)
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feedback.setProgress(int(current * total))
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del writer
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