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c3a978b9da
Port the Geometry Snapper plugin across to the analysis lib, and expose to python bindings Add a new algorithm which performs the snapping to layers
84 lines
3.4 KiB
Python
84 lines
3.4 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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from builtins import str
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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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from qgis.core import QgsFeature
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.parameters import ParameterVector, ParameterNumber
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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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 SnapGeometriesToLayer(GeoAlgorithm):
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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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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Snap geometries to layer')
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self.group, self.i18n_group = self.trAlgorithm('Vector geometry tools')
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self.addParameter(ParameterVector(self.INPUT, self.tr('Input layer')))
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self.addParameter(ParameterVector(self.REFERENCE_LAYER, self.tr('Reference layer')))
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self.addParameter(ParameterNumber(self.TOLERANCE, self.tr('Tolerance (layer units)'), 0.00000001, 9999999999, default=10.0))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Snapped geometries')))
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def processAlgorithm(self, progress):
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layer = dataobjects.getObjectFromUri(self.getParameterValue(self.INPUT))
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reference_layer = dataobjects.getObjectFromUri(self.getParameterValue(self.REFERENCE_LAYER))
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tolerance = self.getParameterValue(self.TOLERANCE)
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if not layer.geometryType() == reference_layer.geometryType():
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raise GeoAlgorithmExecutionException(
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self.tr('Input layer and reference layer must have the same geometry type (eg both are line layers)'))
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(
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layer.fields(), layer.wkbType(), layer.crs())
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features = vector.features(layer)
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self.processed = 0
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self.progress = progress
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self.total = 100.0 / len(features)
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snapper = QgsGeometrySnapper(reference_layer, tolerance)
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snapper.featureSnapped.connect(self.featureSnapped)
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snapped_features = snapper.snapFeatures(features)
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for f in snapped_features:
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writer.addFeature(QgsFeature(f))
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del writer
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def featureSnapped(self):
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self.processed += 1
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self.progress.setPercentage(int(self.processed * self.total))
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