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b1cadb1822
have specific icons, instead of generic qgis icon We consider these 'top level' algorithms, and using the standard algorithm icon should help reflect this and differentiate them from 3rd party algorithms.
126 lines
4.8 KiB
Python
126 lines
4.8 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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SingleSidedBuffer.py
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--------------------
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Date : August 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__ = 'August 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 (QgsApplication,
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QgsGeometry,
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QgsFeatureSink,
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QgsWkbTypes,
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QgsProcessingUtils)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from processing.core.parameters import ParameterVector, ParameterSelection, ParameterNumber
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from processing.core.outputs import OutputVector
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from processing.tools import dataobjects
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class SingleSidedBuffer(QgisAlgorithm):
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INPUT_LAYER = 'INPUT_LAYER'
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OUTPUT_LAYER = 'OUTPUT_LAYER'
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DISTANCE = 'DISTANCE'
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SIDE = 'SIDE'
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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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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.DISTANCE,
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self.tr('Distance'), default=10.0))
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self.sides = [self.tr('Left'),
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'Right']
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self.addParameter(ParameterSelection(
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self.SIDE,
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self.tr('Side'),
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self.sides))
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self.addParameter(ParameterNumber(self.SEGMENTS,
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self.tr('Segments'), 1, default=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(ParameterSelection(
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self.JOIN_STYLE,
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self.tr('Join style'),
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self.join_styles))
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self.addParameter(ParameterNumber(self.MITRE_LIMIT,
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self.tr('Mitre limit'), 1, default=2))
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self.addOutput(OutputVector(self.OUTPUT_LAYER, self.tr('Single sided buffers')))
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def name(self):
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return 'singlesidedbuffer'
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def displayName(self):
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return self.tr('Single sided buffer')
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def processAlgorithm(self, parameters, context, feedback):
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layer = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT_LAYER), context)
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writer = self.getOutputFromName(
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self.OUTPUT_LAYER).getVectorWriter(layer.fields(), QgsWkbTypes.Polygon, layer.crs(), context)
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distance = self.getParameterValue(self.DISTANCE)
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segments = int(self.getParameterValue(self.SEGMENTS))
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join_style = self.getParameterValue(self.JOIN_STYLE) + 1
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if self.getParameterValue(self.SIDE) == 0:
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side = QgsGeometry.SideLeft
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else:
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side = QgsGeometry.SideRight
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miter_limit = self.getParameterValue(self.MITRE_LIMIT)
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features = QgsProcessingUtils.getFeatures(layer, context)
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total = 100.0 / layer.featureCount() if layer.featureCount() else 0
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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.singleSidedBuffer(distance, segments,
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side, join_style, miter_limit)
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if not output_geometry:
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raise GeoAlgorithmExecutionException(
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self.tr('Error calculating single sided buffer'))
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output_feature.setGeometry(output_geometry)
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writer.addFeature(output_feature, QgsFeatureSink.FastInsert)
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feedback.setProgress(int(current * total))
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del writer
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