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b1cadb1822
have specific icons, instead of generic qgis icon We consider these 'top level' algorithms, and using the standard algorithm icon should help reflect this and differentiate them from 3rd party algorithms.
153 lines
6.0 KiB
Python
153 lines
6.0 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 (QgsField,
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QgsGeometry,
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QgsFeatureSink,
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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 HubDistancePoints(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 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_POINT]))
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def name(self):
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return 'distancetonearesthubpoints'
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def displayName(self):
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return self.tr('Distance to nearest hub (points)')
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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.Point, 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 / layerPoints.featureCount() if layerPoints.featureCount() else 0
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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, QgsFeatureSink.FastInsert)
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feedback.setProgress(int(current * total))
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del writer
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