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86368f39c3
- don't use setFilterFid() within loops to fetch features one at time (as it's extremely slow), instead use setFilterFids() outside the loop - don't fetch unused attributes/geometry when it can be avoided
140 lines
5.5 KiB
Python
140 lines
5.5 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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HubDistancePoints.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 Qgis, QgsField, QgsGeometry, QgsDistanceArea, QgsFeature, QgsFeatureRequest, QgsWkbTypes
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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from processing.core.parameters import ParameterVector
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from processing.core.parameters import ParameterTableField
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from processing.core.parameters import ParameterSelection
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from processing.core.outputs import OutputVector
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from processing.tools import dataobjects, vector
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from math import sqrt
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class HubDistancePoints(GeoAlgorithm):
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POINTS = 'POINTS'
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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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UNITS = ['Meters',
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'Feet',
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'Miles',
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'Kilometers',
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'Layer units'
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]
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Distance to nearest hub (points)')
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self.group, self.i18n_group = self.trAlgorithm('Vector analysis tools')
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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(ParameterVector(self.POINTS,
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self.tr('Source points layer')))
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self.addParameter(ParameterVector(self.HUBS,
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self.tr('Destination hubs layer')))
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self.addParameter(ParameterTableField(self.FIELD,
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self.tr('Hub layer name attribute'), self.HUBS))
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self.addParameter(ParameterSelection(self.UNIT,
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self.tr('Measurement unit'), self.units))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Hub distance'), datatype=[dataobjects.TYPE_VECTOR_POINT]))
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def processAlgorithm(self, progress):
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layerPoints = dataobjects.getObjectFromUri(
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self.getParameterValue(self.POINTS))
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layerHubs = dataobjects.getObjectFromUri(
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self.getParameterValue(self.HUBS))
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fieldName = self.getParameterValue(self.FIELD)
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addLines = self.getParameterValue(self.GEOMETRY)
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units = self.UNITS[self.getParameterValue(self.UNIT)]
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if layerPoints.source() == layerHubs.source():
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raise GeoAlgorithmExecutionException(
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self.tr('Same layer given for both hubs and spokes'))
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fields = layerPoints.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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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(
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fields, QgsWkbTypes.Point, layerPoints.crs())
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index = vector.spatialindex(layerHubs)
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distance = QgsDistanceArea()
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distance.setSourceCrs(layerPoints.crs().srsid())
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distance.setEllipsoidalMode(True)
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# Scan source points, find nearest hub, and write to output file
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features = vector.features(layerPoints)
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total = 100.0 / len(features)
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for current, f in enumerate(features):
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src = f.geometry().boundingBox().center()
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neighbors = index.nearestNeighbor(src, 1)
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ft = next(layerHubs.getFeatures(QgsFeatureRequest().setFilterFid(neighbors[0]).setSubsetOfAttributes([fieldName], layerHubs.fields())))
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closest = ft.geometry().boundingBox().center()
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hubDist = distance.measureLine(src, closest)
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attributes = f.attributes()
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attributes.append(ft[fieldName])
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if units == 'Feet':
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attributes.append(hubDist * 3.2808399)
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elif units == 'Miles':
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attributes.append(hubDist * 0.000621371192)
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elif units == 'Kilometers':
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attributes.append(hubDist / 1000.0)
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elif units != 'Meters':
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attributes.append(sqrt(
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pow(src.x() - closest.x(), 2.0) +
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pow(src.y() - closest.y(), 2.0)))
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else:
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attributes.append(hubDist)
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feat = QgsFeature()
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feat.setAttributes(attributes)
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feat.setGeometry(QgsGeometry.fromPoint(src))
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writer.addFeature(feat)
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progress.setPercentage(int(current * total))
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del writer
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