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2628c480c5
Prevent changes to files that weren't changed between releases. This eases review of the changes between releases significantly.
91 lines
3.1 KiB
Python
91 lines
3.1 KiB
Python
# -*- coding: utf-8 -*-
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"""
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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 (QgsFeature,
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QgsGeometry,
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QgsFeatureRequest,
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QgsFeatureSink)
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def buffering(feedback, context, sink, distance, field, useField, source, dissolve, segments, endCapStyle=1,
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joinStyle=1, miterLimit=2):
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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(QgsFeatureRequest().setSubsetOfAttributes(attributes_to_fetch))
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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(inGeom.buffer(float(value), segments, endCapStyle, joinStyle, miterLimit))
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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.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(float(value), segments, endCapStyle, joinStyle, miterLimit)
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outFeat.setGeometry(outGeom)
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outFeat.setAttributes(attrs)
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sink.addFeature(outFeat, QgsFeatureSink.FastInsert)
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current += 1
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feedback.setProgress(int(current * total))
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