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286 lines
10 KiB
Python
286 lines
10 KiB
Python
"""
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***************************************************************************
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Gridify.py
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---------------------
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Date : May 2010
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Copyright : (C) 2010 by Michael Minn
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Email : pyqgis at michaelminn 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__ = "Michael Minn"
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__date__ = "May 2010"
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__copyright__ = "(C) 2010, Michael Minn"
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from qgis.core import (
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QgsFeature,
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QgsGeometry,
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QgsMultiPoint,
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QgsMultiLineString,
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QgsLineString,
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QgsPolygon,
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QgsFeatureSink,
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QgsWkbTypes,
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QgsProcessingException,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterEnum,
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QgsProcessingParameterFeatureSink,
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)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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class GeometryConvert(QgisAlgorithm):
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INPUT = "INPUT"
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TYPE = "TYPE"
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OUTPUT = "OUTPUT"
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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 initAlgorithm(self, config=None):
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self.types = [
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self.tr("Centroids"),
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self.tr("Nodes"),
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self.tr("Linestrings"),
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self.tr("Multilinestrings"),
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self.tr("Polygons"),
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]
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self.addParameter(
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QgsProcessingParameterFeatureSource(self.INPUT, self.tr("Input layer"))
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)
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self.addParameter(
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QgsProcessingParameterEnum(
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self.TYPE, self.tr("New geometry type"), options=self.types
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)
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)
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self.addParameter(
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QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr("Converted"))
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)
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def name(self):
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return "convertgeometrytype"
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def displayName(self):
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return self.tr("Convert geometry type")
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def processAlgorithm(self, parameters, context, feedback):
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source = self.parameterAsSource(parameters, self.INPUT, context)
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if source is None:
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raise QgsProcessingException(
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self.invalidSourceError(parameters, self.INPUT)
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)
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index = self.parameterAsEnum(parameters, self.TYPE, context)
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if index == 0:
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newType = QgsWkbTypes.Type.Point
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elif index == 1:
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newType = QgsWkbTypes.Type.Point
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if QgsWkbTypes.hasM(source.wkbType()):
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newType = QgsWkbTypes.addM(newType)
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if QgsWkbTypes.hasZ(source.wkbType()):
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newType = QgsWkbTypes.addZ(newType)
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elif index == 2:
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newType = QgsWkbTypes.Type.LineString
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if QgsWkbTypes.hasM(source.wkbType()):
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newType = QgsWkbTypes.addM(newType)
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if QgsWkbTypes.hasZ(source.wkbType()):
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newType = QgsWkbTypes.addZ(newType)
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elif index == 3:
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newType = QgsWkbTypes.Type.MultiLineString
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if QgsWkbTypes.hasM(source.wkbType()):
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newType = QgsWkbTypes.addM(newType)
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if QgsWkbTypes.hasZ(source.wkbType()):
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newType = QgsWkbTypes.addZ(newType)
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else:
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newType = QgsWkbTypes.Type.Polygon
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if QgsWkbTypes.hasM(source.wkbType()):
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newType = QgsWkbTypes.addM(newType)
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if QgsWkbTypes.hasZ(source.wkbType()):
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newType = QgsWkbTypes.addZ(newType)
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(sink, dest_id) = self.parameterAsSink(
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parameters,
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self.OUTPUT,
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context,
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source.fields(),
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newType,
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source.sourceCrs(),
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)
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if sink is None:
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raise QgsProcessingException(self.invalidSinkError(parameters, self.OUTPUT))
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features = source.getFeatures()
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total = 100.0 / source.featureCount() if source.featureCount() else 0
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for current, f in enumerate(features):
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if feedback.isCanceled():
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break
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if not f.hasGeometry():
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sink.addFeature(f, QgsFeatureSink.Flag.FastInsert)
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else:
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for p in self.convertGeometry(f.geometry(), index):
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feat = QgsFeature()
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feat.setAttributes(f.attributes())
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feat.setGeometry(p)
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sink.addFeature(feat, QgsFeatureSink.Flag.FastInsert)
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feedback.setProgress(int(current * total))
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sink.finalize()
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return {self.OUTPUT: dest_id}
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def convertGeometry(self, geom, target_type):
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# returns an array of output geometries for the input geometry
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if target_type == 0:
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# centroid
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return self.convertToCentroid(geom)
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elif target_type == 1:
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# nodes
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return self.convertToNodes(geom)
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elif target_type == 2:
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# linestrings
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return self.convertToLineStrings(geom)
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elif target_type == 3:
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# multilinestrings
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return self.convertToMultiLineStrings(geom)
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elif target_type == 4:
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# polygon
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return self.convertToPolygon(geom)
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def convertToCentroid(self, geom):
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return [geom.centroid()]
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def convertToNodes(self, geom):
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mp = QgsMultiPoint()
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# TODO: mega inefficient - needs rework when geometry iterators land
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# (but at least it doesn't lose Z/M values)
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for g in geom.constGet().coordinateSequence():
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for r in g:
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for p in r:
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mp.addGeometry(p)
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return [QgsGeometry(mp)]
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def convertToLineStrings(self, geom):
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if (
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QgsWkbTypes.geometryType(geom.wkbType())
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== QgsWkbTypes.GeometryType.PointGeometry
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):
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raise QgsProcessingException(
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self.tr("Cannot convert from {0} to LineStrings").format(
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QgsWkbTypes.displayString(geom.wkbType())
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)
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)
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elif (
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QgsWkbTypes.geometryType(geom.wkbType())
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== QgsWkbTypes.GeometryType.LineGeometry
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):
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if QgsWkbTypes.isMultiType(geom.wkbType()):
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return geom.asGeometryCollection()
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else:
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# line to line
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return [geom]
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else:
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# polygons to lines
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# we just use the boundary here - that consists of all rings in the (multi)polygon
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boundary = QgsGeometry(geom.constGet().boundary())
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# boundary will be multipart
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return boundary.asGeometryCollection()
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def convertToMultiLineStrings(self, geom):
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if (
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QgsWkbTypes.geometryType(geom.wkbType())
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== QgsWkbTypes.GeometryType.PointGeometry
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):
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raise QgsProcessingException(
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self.tr("Cannot convert from {0} to MultiLineStrings").format(
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QgsWkbTypes.displayString(geom.wkbType())
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)
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)
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elif (
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QgsWkbTypes.geometryType(geom.wkbType())
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== QgsWkbTypes.GeometryType.LineGeometry
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):
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if QgsWkbTypes.isMultiType(geom.wkbType()):
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return [geom]
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else:
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# line to multiLine
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ml = QgsMultiLineString()
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ml.addGeometry(geom.constGet().clone())
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return [QgsGeometry(ml)]
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else:
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# polygons to multilinestring
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# we just use the boundary here - that consists of all rings in the (multi)polygon
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return [QgsGeometry(geom.constGet().boundary())]
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def convertToPolygon(self, geom):
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if (
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QgsWkbTypes.geometryType(geom.wkbType())
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== QgsWkbTypes.GeometryType.PointGeometry
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and geom.constGet().nCoordinates() < 3
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):
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raise QgsProcessingException(
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self.tr("Cannot convert from Point to Polygon").format(
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QgsWkbTypes.displayString(geom.wkbType())
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)
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)
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elif (
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QgsWkbTypes.geometryType(geom.wkbType())
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== QgsWkbTypes.GeometryType.PointGeometry
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):
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# multipoint with at least 3 points
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# TODO: mega inefficient - needs rework when geometry iterators land
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# (but at least it doesn't lose Z/M values)
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points = []
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for g in geom.constGet().coordinateSequence():
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for r in g:
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for p in r:
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points.append(p)
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linestring = QgsLineString(points)
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linestring.close()
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p = QgsPolygon()
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p.setExteriorRing(linestring)
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return [QgsGeometry(p)]
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elif (
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QgsWkbTypes.geometryType(geom.wkbType())
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== QgsWkbTypes.GeometryType.LineGeometry
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):
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if QgsWkbTypes.isMultiType(geom.wkbType()):
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parts = []
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for i in range(geom.constGet().numGeometries()):
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p = QgsPolygon()
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linestring = geom.constGet().geometryN(i).clone()
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linestring.close()
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p.setExteriorRing(linestring)
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parts.append(QgsGeometry(p))
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return QgsGeometry.collectGeometry(parts)
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else:
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# linestring to polygon
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p = QgsPolygon()
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linestring = geom.constGet().clone()
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linestring.close()
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p.setExteriorRing(linestring)
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return [QgsGeometry(p)]
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else:
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# polygon
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if QgsWkbTypes.isMultiType(geom.wkbType()):
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return geom.asGeometryCollection()
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else:
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return [geom]
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