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43cd62b62f
Instead of returning a single QgsFeature from processFeature, we now return a list of features. This allows feature based algorithms which return multiple features per input feature, e.g. "explode" type algorithms which split a single input feature into multiple output features.
134 lines
4.5 KiB
Python
134 lines
4.5 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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LinesToPolygons.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 (QgsFeature,
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QgsGeometry,
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QgsGeometryCollection,
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QgsPolygon,
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QgsMultiPolygon,
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QgsMultiSurface,
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QgsWkbTypes,
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QgsFeatureSink,
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QgsProcessing,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterFeatureSink,
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QgsProcessingUtils)
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from processing.algs.qgis.QgisAlgorithm import QgisFeatureBasedAlgorithm
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from processing.tools import dataobjects, vector
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class LinesToPolygons(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 groupId(self):
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return 'vectorgeometry'
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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 'linestopolygons'
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def displayName(self):
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return self.tr('Lines to polygons')
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def outputName(self):
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return self.tr('Polygons')
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def outputType(self):
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return QgsProcessing.TypeVectorPolygon
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def inputLayerTypes(self):
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return [QgsProcessing.TypeVectorLine]
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def outputWkbType(self, input_wkb_type):
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return self.convertWkbToPolygons(input_wkb_type)
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def processFeature(self, feature, context, feedback):
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if feature.hasGeometry():
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feature.setGeometry(QgsGeometry(self.convertToPolygons(feature.geometry())))
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if feature.geometry().isEmpty():
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feedback.reportError(self.tr("One or more line ignored due to geometry not having a minimum of three vertices."))
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return [feature]
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def convertWkbToPolygons(self, wkb):
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multi_wkb = None
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if QgsWkbTypes.singleType(QgsWkbTypes.flatType(wkb)) == QgsWkbTypes.LineString:
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multi_wkb = QgsWkbTypes.MultiPolygon
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elif QgsWkbTypes.singleType(QgsWkbTypes.flatType(wkb)) == QgsWkbTypes.CompoundCurve:
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multi_wkb = QgsWkbTypes.MultiSurface
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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 convertToPolygons(self, geometry):
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surfaces = self.getSurfaces(geometry.constGet())
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output_wkb = self.convertWkbToPolygons(geometry.wkbType())
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out_geom = None
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if QgsWkbTypes.flatType(output_wkb) == QgsWkbTypes.MultiPolygon:
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out_geom = QgsMultiPolygon()
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else:
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out_geom = QgsMultiSurface()
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for surface in surfaces:
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out_geom.addGeometry(surface)
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return out_geom
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def getSurfaces(self, geometry):
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surfaces = []
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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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surfaces.extend(self.getSurfaces(geometry.geometryN(i)))
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else:
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# not collection
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if geometry.vertexCount() > 2:
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surface = QgsPolygon()
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surface.setExteriorRing(geometry.clone())
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surfaces.append(surface)
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return surfaces
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