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7f687345f8
to control whether selected features only are to be used Replaces the old global setting and makes it immediately obvious to users when the selection will be respected
108 lines
4.2 KiB
Python
108 lines
4.2 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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QgsProcessingUtils,
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QgsProcessingParameterDefinition,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterFeatureSink,
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QgsProcessingOutputVectorLayer)
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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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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from processing.core.parameters import ParameterVector
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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 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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self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT_LAYER, self.tr('Input layer'), [QgsProcessingParameterDefinition.TypeVectorLine, QgsProcessingParameterDefinition.TypeVectorPolygon]))
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self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT_LAYER, self.tr('Boundary')))
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self.addOutput(QgsProcessingOutputVectorLayer(self.OUTPUT_LAYER, self.tr("Boundaries")))
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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()
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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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raise GeoAlgorithmExecutionException(
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self.tr('Error calculating boundary'))
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output_feature.setGeometry(output_geometry)
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sink.addFeature(output_feature)
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feedback.setProgress(int(current * total))
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return {self.OUTPUT_LAYER: dest_id}
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