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113 lines
3.4 KiB
Python
113 lines
3.4 KiB
Python
"""
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***************************************************************************
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Buffer.py
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---------------------
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Date : August 2012
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Copyright : (C) 2012 by Victor Olaya
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Email : volayaf 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__ = "Victor Olaya"
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__date__ = "August 2012"
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__copyright__ = "(C) 2012, Victor Olaya"
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from qgis.core import Qgis, QgsFeature, QgsGeometry, QgsFeatureRequest, QgsFeatureSink
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def buffering(
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feedback,
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context,
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sink,
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distance,
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field,
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useField,
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source,
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dissolve,
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segments,
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endCapStyle=1,
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joinStyle=1,
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miterLimit=2,
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):
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if useField:
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field = source.fields().lookupField(field)
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outFeat = QgsFeature()
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current = 0
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total = 100.0 / source.featureCount() if source.featureCount() else 0
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# With dissolve
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if dissolve:
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attributes_to_fetch = []
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if useField:
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attributes_to_fetch.append(field)
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features = source.getFeatures(
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QgsFeatureRequest().setSubsetOfAttributes(attributes_to_fetch)
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)
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buffered_geometries = []
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for inFeat in features:
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if feedback.isCanceled():
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break
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attrs = inFeat.attributes()
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if useField:
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value = attrs[field]
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else:
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value = distance
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inGeom = inFeat.geometry()
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buffered_geometries.append(
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inGeom.buffer(
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float(value),
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segments,
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Qgis.EndCapStyle(endCapStyle),
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Qgis.JoinStyle(joinStyle),
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miterLimit,
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)
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)
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current += 1
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feedback.setProgress(int(current * total))
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final_geometry = QgsGeometry.unaryUnion(buffered_geometries)
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outFeat.setGeometry(final_geometry)
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outFeat.setAttributes(attrs)
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sink.addFeature(outFeat, QgsFeatureSink.Flag.FastInsert)
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else:
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features = source.getFeatures()
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# Without dissolve
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for inFeat in features:
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if feedback.isCanceled():
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break
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attrs = inFeat.attributes()
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if useField:
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value = attrs[field]
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else:
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value = distance
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inGeom = inFeat.geometry()
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outFeat = QgsFeature()
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outGeom = inGeom.buffer(
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float(value),
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segments,
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Qgis.EndCapStyle(endCapStyle),
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Qgis.JoinStyle(joinStyle),
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miterLimit,
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)
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outFeat.setGeometry(outGeom)
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outFeat.setAttributes(attrs)
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sink.addFeature(outFeat, QgsFeatureSink.Flag.FastInsert)
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current += 1
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feedback.setProgress(int(current * total))
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