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and add new QgsGeometry::fromPolyline which uses QgsPoint We want to encourage people not to use the QgsPointXY method, as it drops Z/M values. So it's moved across to a different name to make way for a new QgsGeometry::fromPolyline which uses a QgsPoint list instead of QgsPointXY, thus keeping Z/M values intact. Similarly, QgsPolyline now is a list of QgsPoint (keeping z/m values) and the old 2d QgsPolyline type was renamed to QgsPolylineXY. Making the QgsPoint method the "preferred" method and making linestrings just as easy to create from z/m dimensioned points as 2d points is important to push people to write code which does not discard these important dimensions. As a bonus, the QgsPoint methods are more efficient anyway, since they don't require creation of a temporary list.
155 lines
6.2 KiB
Python
155 lines
6.2 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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HubDistanceLines.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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from builtins import next
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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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# 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.PyQt.QtCore import QVariant
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from qgis.core import (QgsField,
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QgsGeometry,
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QgsDistanceArea,
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QgsFeature,
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QgsFeatureSink,
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QgsFeatureRequest,
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QgsWkbTypes,
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QgsUnitTypes,
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QgsProcessing,
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QgsProcessingParameterFeatureSource,
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QgsProcessingParameterField,
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QgsProcessingParameterEnum,
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QgsProcessingParameterFeatureSink,
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QgsProcessingException,
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QgsSpatialIndex)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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from math import sqrt
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class HubDistanceLines(QgisAlgorithm):
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INPUT = 'INPUT'
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HUBS = 'HUBS'
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FIELD = 'FIELD'
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UNIT = 'UNIT'
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OUTPUT = 'OUTPUT'
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LAYER_UNITS = 'LAYER_UNITS'
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UNITS = [QgsUnitTypes.DistanceMeters,
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QgsUnitTypes.DistanceFeet,
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QgsUnitTypes.DistanceMiles,
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QgsUnitTypes.DistanceKilometers,
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LAYER_UNITS
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]
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def group(self):
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return self.tr('Vector analysis')
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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.units = [self.tr('Meters'),
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self.tr('Feet'),
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self.tr('Miles'),
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self.tr('Kilometers'),
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self.tr('Layer units')]
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self.addParameter(QgsProcessingParameterFeatureSource(self.INPUT,
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self.tr('Source points layer')))
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self.addParameter(QgsProcessingParameterFeatureSource(self.HUBS,
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self.tr('Destination hubs layer')))
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self.addParameter(QgsProcessingParameterField(self.FIELD,
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self.tr('Hub layer name attribute'), parentLayerParameterName=self.HUBS))
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self.addParameter(QgsProcessingParameterEnum(self.UNIT,
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self.tr('Measurement unit'), self.units))
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self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Hub distance'), QgsProcessing.TypeVectorLine))
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def name(self):
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return 'distancetonearesthublinetohub'
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def displayName(self):
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return self.tr('Distance to nearest hub (line to hub)')
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def processAlgorithm(self, parameters, context, feedback):
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if parameters[self.INPUT] == parameters[self.HUBS]:
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raise QgsProcessingException(
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self.tr('Same layer given for both hubs and spokes'))
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point_source = self.parameterAsSource(parameters, self.INPUT, context)
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hub_source = self.parameterAsSource(parameters, self.HUBS, context)
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fieldName = self.parameterAsString(parameters, self.FIELD, context)
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units = self.UNITS[self.parameterAsEnum(parameters, self.UNIT, context)]
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fields = point_source.fields()
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fields.append(QgsField('HubName', QVariant.String))
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fields.append(QgsField('HubDist', QVariant.Double))
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(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
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fields, QgsWkbTypes.LineString, point_source.sourceCrs())
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index = QgsSpatialIndex(hub_source.getFeatures(QgsFeatureRequest().setSubsetOfAttributes([]).setDestinationCrs(point_source.sourceCrs())))
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distance = QgsDistanceArea()
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distance.setSourceCrs(point_source.sourceCrs())
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distance.setEllipsoid(context.project().ellipsoid())
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# Scan source points, find nearest hub, and write to output file
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features = point_source.getFeatures()
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total = 100.0 / point_source.featureCount() if point_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.FastInsert)
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continue
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src = f.geometry().boundingBox().center()
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neighbors = index.nearestNeighbor(src, 1)
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ft = next(hub_source.getFeatures(QgsFeatureRequest().setFilterFid(neighbors[0]).setSubsetOfAttributes([fieldName], hub_source.fields()).setDestinationCrs(point_source.sourceCrs())))
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closest = ft.geometry().boundingBox().center()
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hubDist = distance.measureLine(src, closest)
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if units != self.LAYER_UNITS:
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hub_dist_in_desired_units = distance.convertLengthMeasurement(hubDist, units)
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else:
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hub_dist_in_desired_units = hubDist
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attributes = f.attributes()
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attributes.append(ft[fieldName])
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attributes.append(hub_dist_in_desired_units)
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feat = QgsFeature()
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feat.setAttributes(attributes)
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feat.setGeometry(QgsGeometry.fromPolylineXY([src, closest]))
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sink.addFeature(feat, QgsFeatureSink.FastInsert)
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feedback.setProgress(int(current * total))
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return {self.OUTPUT: dest_id}
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