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104 lines
4.0 KiB
Python
104 lines
4.0 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Boundary.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 (QgsGeometry,
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QgsWkbTypes,
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QgsFeatureSink,
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QgsProcessing,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterFeatureSink)
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from qgis.PyQt.QtGui import QIcon
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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 Boundary(QgisAlgorithm):
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INPUT_LAYER = 'INPUT_LAYER'
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OUTPUT_LAYER = 'OUTPUT_LAYER'
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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_LAYER, self.tr('Input layer'), [QgsProcessing.TypeVectorLine, QgsProcessing.TypeVectorPolygon]))
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self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT_LAYER, self.tr('Boundary')))
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def icon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'convex_hull.png'))
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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 'boundary'
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def displayName(self):
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return self.tr('Boundary')
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def processAlgorithm(self, parameters, context, feedback):
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source = self.parameterAsSource(parameters, self.INPUT_LAYER, context)
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input_wkb = source.wkbType()
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if QgsWkbTypes.geometryType(input_wkb) == QgsWkbTypes.LineGeometry:
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output_wkb = QgsWkbTypes.MultiPoint
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elif QgsWkbTypes.geometryType(input_wkb) == QgsWkbTypes.PolygonGeometry:
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output_wkb = QgsWkbTypes.MultiLineString
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if QgsWkbTypes.hasZ(input_wkb):
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output_wkb = QgsWkbTypes.addZ(output_wkb)
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if QgsWkbTypes.hasM(input_wkb):
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output_wkb = QgsWkbTypes.addM(output_wkb)
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(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT_LAYER, context,
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source.fields(), output_wkb, source.sourceCrs())
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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 = QgsGeometry(input_geometry.geometry().boundary())
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if not output_geometry:
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feedback.reportError(self.tr('No boundary for feature {} (possibly a closed linestring?)').format(input_feature.id()))
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output_feature.clearGeometry()
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else:
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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_LAYER: dest_id}
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