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158 lines
6.1 KiB
Python
158 lines
6.1 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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QgsFeatureRequest,
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QgsWkbTypes,
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QgsApplication,
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QgsProject,
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QgsProcessingUtils)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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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
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from math import sqrt
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class HubDistanceLines(QgisAlgorithm):
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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 icon(self):
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return QgsApplication.getThemeIcon("/providerQgis.svg")
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def svgIconPath(self):
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return QgsApplication.iconPath("providerQgis.svg")
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def group(self):
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return self.tr('Vector analysis tools')
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def __init__(self):
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super().__init__()
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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_LINE]))
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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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layerPoints = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.POINTS), context)
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layerHubs = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.HUBS), context)
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fieldName = self.getParameterValue(self.FIELD)
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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(fields, QgsWkbTypes.LineString, layerPoints.crs(),
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context)
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index = QgsProcessingUtils.createSpatialIndex(layerHubs, context)
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distance = QgsDistanceArea()
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distance.setSourceCrs(layerPoints.crs())
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distance.setEllipsoid(QgsProject.instance().ellipsoid())
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# Scan source points, find nearest hub, and write to output file
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features = QgsProcessingUtils.getFeatures(layerPoints, context)
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total = 100.0 / QgsProcessingUtils.featureCount(layerPoints, context)
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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.fromPolyline([src, closest]))
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writer.addFeature(feat)
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feedback.setProgress(int(current * total))
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del writer
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