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118 lines
3.8 KiB
Python
118 lines
3.8 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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PolygonsToLines.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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import os
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from qgis.PyQt.QtGui import QIcon
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from qgis.core import (QgsGeometry,
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QgsGeometryCollection,
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QgsMultiLineString,
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QgsMultiCurve,
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QgsWkbTypes,
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QgsProcessing)
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from processing.algs.qgis.QgisAlgorithm import QgisFeatureBasedAlgorithm
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class PolygonsToLines(QgisFeatureBasedAlgorithm):
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def icon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'to_lines.png'))
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def tags(self):
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return self.tr('line,polygon,convert').split(',')
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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 name(self):
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return 'polygonstolines'
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def displayName(self):
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return self.tr('Polygons to lines')
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def outputName(self):
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return self.tr('Lines')
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def outputType(self):
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return QgsProcessing.TypeVectorLine
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def outputWkbType(self, input_wkb_type):
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return self.convertWkbToLines(input_wkb_type)
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def processFeature(self, feature, feedback):
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if feature.hasGeometry():
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feature.setGeometry(QgsGeometry(self.convertToLines(feature.geometry())))
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return feature
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def convertWkbToLines(self, wkb):
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multi_wkb = None
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if QgsWkbTypes.singleType(QgsWkbTypes.flatType(wkb)) == QgsWkbTypes.Polygon:
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multi_wkb = QgsWkbTypes.MultiLineString
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elif QgsWkbTypes.singleType(QgsWkbTypes.flatType(wkb)) == QgsWkbTypes.CurvePolygon:
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multi_wkb = QgsWkbTypes.MultiCurve
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if QgsWkbTypes.hasM(wkb):
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multi_wkb = QgsWkbTypes.addM(multi_wkb)
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if QgsWkbTypes.hasZ(wkb):
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multi_wkb = QgsWkbTypes.addZ(multi_wkb)
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return multi_wkb
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def convertToLines(self, geometry):
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rings = self.getRings(geometry.geometry())
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output_wkb = self.convertWkbToLines(geometry.wkbType())
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out_geom = None
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if QgsWkbTypes.flatType(output_wkb) == QgsWkbTypes.MultiLineString:
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out_geom = QgsMultiLineString()
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else:
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out_geom = QgsMultiCurve()
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for ring in rings:
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out_geom.addGeometry(ring)
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return out_geom
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def getRings(self, geometry):
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rings = []
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if isinstance(geometry, QgsGeometryCollection):
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# collection
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for i in range(geometry.numGeometries()):
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rings.extend(self.getRings(geometry.geometryN(i)))
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else:
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# not collection
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rings.append(geometry.exteriorRing().clone())
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for i in range(geometry.numInteriorRings()):
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rings.append(geometry.interiorRing(i).clone())
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return rings
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