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124 lines
5.3 KiB
Python
124 lines
5.3 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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SnapGeometries.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 archive
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__revision__ = '$Format:%H$'
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from qgis.analysis import (QgsGeometrySnapper,
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QgsInternalGeometrySnapper)
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from qgis.core import (QgsFeatureSink,
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QgsProcessing,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterFeatureSink,
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QgsProcessingParameterNumber,
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QgsProcessingParameterEnum)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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class SnapGeometriesToLayer(QgisAlgorithm):
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INPUT = 'INPUT'
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REFERENCE_LAYER = 'REFERENCE_LAYER'
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TOLERANCE = 'TOLERANCE'
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OUTPUT = 'OUTPUT'
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BEHAVIOR = 'BEHAVIOR'
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def group(self):
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return self.tr('Vector geometry')
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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, self.tr('Input layer'), [QgsProcessing.TypeVectorPoint, QgsProcessing.TypeVectorLine, QgsProcessing.TypeVectorPolygon]))
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self.addParameter(QgsProcessingParameterFeatureSource(self.REFERENCE_LAYER, self.tr('Reference layer'),
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[QgsProcessing.TypeVectorPoint,
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QgsProcessing.TypeVectorLine,
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QgsProcessing.TypeVectorPolygon]))
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self.addParameter(QgsProcessingParameterNumber(self.TOLERANCE, self.tr('Tolerance (layer units)'), type=QgsProcessingParameterNumber.Double,
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minValue=0.00000001, maxValue=9999999999, defaultValue=10.0))
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self.modes = [self.tr('Prefer aligning nodes'),
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self.tr('Prefer closest point'),
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self.tr('Move end points only, prefer aligning nodes'),
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self.tr('Move end points only, prefer closest point'),
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self.tr('Snap end points to end points only')]
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self.addParameter(QgsProcessingParameterEnum(
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self.BEHAVIOR,
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self.tr('Behavior'),
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options=self.modes, defaultValue=0))
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self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Snapped geometry')))
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def name(self):
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return 'snapgeometries'
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def displayName(self):
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return self.tr('Snap geometries to layer')
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def processAlgorithm(self, parameters, context, feedback):
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source = self.parameterAsSource(parameters, self.INPUT, context)
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reference_source = self.parameterAsSource(parameters, self.REFERENCE_LAYER, context)
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tolerance = self.parameterAsDouble(parameters, self.TOLERANCE, context)
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mode = self.parameterAsEnum(parameters, self.BEHAVIOR, context)
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(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
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source.fields(), source.wkbType(), 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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if parameters[self.INPUT] != parameters[self.REFERENCE_LAYER]:
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snapper = QgsGeometrySnapper(reference_source)
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processed = 0
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for f in features:
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if feedback.isCanceled():
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break
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if f.hasGeometry():
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out_feature = f
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out_feature.setGeometry(snapper.snapGeometry(f.geometry(), tolerance, mode))
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sink.addFeature(out_feature, QgsFeatureSink.FastInsert)
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else:
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sink.addFeature(f)
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processed += 1
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feedback.setProgress(processed * total)
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else:
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# snapping internally
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snapper = QgsInternalGeometrySnapper(tolerance, mode)
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processed = 0
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for f in features:
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if feedback.isCanceled():
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break
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out_feature = f
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out_feature.setGeometry(snapper.snapFeature(f))
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sink.addFeature(out_feature, QgsFeatureSink.FastInsert)
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processed += 1
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feedback.setProgress(processed * total)
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return {self.OUTPUT: dest_id}
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