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97 lines
3.5 KiB
Python
97 lines
3.5 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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# 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.core import QgsFeature, QgsGeometry
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from processing.core.ProcessingLog import ProcessingLog
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from processing.tools import vector
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def buffering(progress, writer, distance, field, useField, layer, dissolve,
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segments, endCapStyle=1, joinStyle=1, mitreLimit=2):
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if useField:
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field = layer.fields().lookupField(field)
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outFeat = QgsFeature()
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current = 0
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features = vector.features(layer)
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total = 100.0 / float(len(features))
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# With dissolve
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if dissolve:
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first = True
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buffered_geometries = []
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for inFeat in features:
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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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if not inGeom:
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ProcessingLog.addToLog(ProcessingLog.LOG_WARNING, 'Feature {} has empty geometry. Skipping...'.format(inFeat.id()))
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continue
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if not inGeom.isGeosValid():
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ProcessingLog.addToLog(ProcessingLog.LOG_WARNING, 'Feature {} has invalid geometry. Skipping...'.format(inFeat.id()))
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continue
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buffered_geometries.append(inGeom.buffer(float(value), segments, endCapStyle, joinStyle, mitreLimit))
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current += 1
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progress.setPercentage(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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writer.addFeature(outFeat)
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else:
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# Without dissolve
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for inFeat in features:
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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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if inGeom.isEmpty() or inGeom.isGeosEmpty():
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pass
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elif not inGeom.isGeosValid():
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ProcessingLog.addToLog(ProcessingLog.LOG_WARNING, 'Feature {} has invalid geometry. Skipping...'.format(inFeat.id()))
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continue
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else:
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outGeom = inGeom.buffer(float(value), segments, endCapStyle, joinStyle, mitreLimit)
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outFeat.setGeometry(outGeom)
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outFeat.setAttributes(attrs)
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writer.addFeature(outFeat)
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current += 1
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progress.setPercentage(int(current * total))
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del writer
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