mirror of
https://github.com/qgis/QGIS.git
synced 2025-03-03 00:02:25 -05:00
159 lines
6.0 KiB
Python
159 lines
6.0 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
HubDistanceLines.py
|
|
---------------------
|
|
Date : May 2010
|
|
Copyright : (C) 2010 by Michael Minn
|
|
Email : pyqgis at michaelminn dot com
|
|
***************************************************************************
|
|
* *
|
|
* This program is free software; you can redistribute it and/or modify *
|
|
* it under the terms of the GNU General Public License as published by *
|
|
* the Free Software Foundation; either version 2 of the License, or *
|
|
* (at your option) any later version. *
|
|
* *
|
|
***************************************************************************
|
|
"""
|
|
from builtins import next
|
|
|
|
__author__ = 'Michael Minn'
|
|
__date__ = 'May 2010'
|
|
__copyright__ = '(C) 2010, Michael Minn'
|
|
|
|
# This will get replaced with a git SHA1 when you do a git archive
|
|
|
|
__revision__ = '$Format:%H$'
|
|
|
|
from qgis.PyQt.QtCore import QVariant
|
|
from qgis.core import (QgsField,
|
|
QgsGeometry,
|
|
QgsDistanceArea,
|
|
QgsFeature,
|
|
QgsFeatureRequest,
|
|
QgsWkbTypes,
|
|
QgsApplication,
|
|
QgsProject,
|
|
QgsProcessingUtils)
|
|
from processing.core.GeoAlgorithm import GeoAlgorithm
|
|
from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
|
|
from processing.core.parameters import ParameterVector
|
|
from processing.core.parameters import ParameterTableField
|
|
from processing.core.parameters import ParameterSelection
|
|
from processing.core.outputs import OutputVector
|
|
|
|
from processing.tools import dataobjects, vector
|
|
|
|
from math import sqrt
|
|
|
|
|
|
class HubDistanceLines(GeoAlgorithm):
|
|
POINTS = 'POINTS'
|
|
HUBS = 'HUBS'
|
|
FIELD = 'FIELD'
|
|
UNIT = 'UNIT'
|
|
OUTPUT = 'OUTPUT'
|
|
|
|
UNITS = ['Meters',
|
|
'Feet',
|
|
'Miles',
|
|
'Kilometers',
|
|
'Layer units'
|
|
]
|
|
|
|
def icon(self):
|
|
return QgsApplication.getThemeIcon("/providerQgis.svg")
|
|
|
|
def svgIconPath(self):
|
|
return QgsApplication.iconPath("providerQgis.svg")
|
|
|
|
def group(self):
|
|
return self.tr('Vector analysis tools')
|
|
|
|
def name(self):
|
|
return 'distancetonearesthublinetohub'
|
|
|
|
def displayName(self):
|
|
return self.tr('Distance to nearest hub (line to hub)')
|
|
|
|
def defineCharacteristics(self):
|
|
self.units = [self.tr('Meters'),
|
|
self.tr('Feet'),
|
|
self.tr('Miles'),
|
|
self.tr('Kilometers'),
|
|
self.tr('Layer units')]
|
|
|
|
self.addParameter(ParameterVector(self.POINTS,
|
|
self.tr('Source points layer')))
|
|
self.addParameter(ParameterVector(self.HUBS,
|
|
self.tr('Destination hubs layer')))
|
|
self.addParameter(ParameterTableField(self.FIELD,
|
|
self.tr('Hub layer name attribute'), self.HUBS))
|
|
self.addParameter(ParameterSelection(self.UNIT,
|
|
self.tr('Measurement unit'), self.units))
|
|
|
|
self.addOutput(OutputVector(self.OUTPUT, self.tr('Hub distance'), datatype=[dataobjects.TYPE_VECTOR_LINE]))
|
|
|
|
def processAlgorithm(self, context, feedback):
|
|
layerPoints = dataobjects.getLayerFromString(
|
|
self.getParameterValue(self.POINTS))
|
|
layerHubs = dataobjects.getLayerFromString(
|
|
self.getParameterValue(self.HUBS))
|
|
fieldName = self.getParameterValue(self.FIELD)
|
|
|
|
units = self.UNITS[self.getParameterValue(self.UNIT)]
|
|
|
|
if layerPoints.source() == layerHubs.source():
|
|
raise GeoAlgorithmExecutionException(
|
|
self.tr('Same layer given for both hubs and spokes'))
|
|
|
|
fields = layerPoints.fields()
|
|
fields.append(QgsField('HubName', QVariant.String))
|
|
fields.append(QgsField('HubDist', QVariant.Double))
|
|
|
|
writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(
|
|
fields, QgsWkbTypes.LineString, layerPoints.crs())
|
|
|
|
index = vector.spatialindex(layerHubs)
|
|
|
|
distance = QgsDistanceArea()
|
|
distance.setSourceCrs(layerPoints.crs())
|
|
distance.setEllipsoid(QgsProject.instance().ellipsoid())
|
|
|
|
# Scan source points, find nearest hub, and write to output file
|
|
features = QgsProcessingUtils.getFeatures(layerPoints, context)
|
|
total = 100.0 / QgsProcessingUtils.featureCount(layerPoints, context)
|
|
for current, f in enumerate(features):
|
|
src = f.geometry().boundingBox().center()
|
|
|
|
neighbors = index.nearestNeighbor(src, 1)
|
|
ft = next(layerHubs.getFeatures(QgsFeatureRequest().setFilterFid(neighbors[0]).setSubsetOfAttributes([fieldName], layerHubs.fields())))
|
|
closest = ft.geometry().boundingBox().center()
|
|
hubDist = distance.measureLine(src, closest)
|
|
|
|
attributes = f.attributes()
|
|
attributes.append(ft[fieldName])
|
|
if units == 'Feet':
|
|
attributes.append(hubDist * 3.2808399)
|
|
elif units == 'Miles':
|
|
attributes.append(hubDist * 0.000621371192)
|
|
elif units == 'Kilometers':
|
|
attributes.append(hubDist / 1000.0)
|
|
elif units != 'Meters':
|
|
attributes.append(sqrt(
|
|
pow(src.x() - closest.x(), 2.0) +
|
|
pow(src.y() - closest.y(), 2.0)))
|
|
else:
|
|
attributes.append(hubDist)
|
|
|
|
feat = QgsFeature()
|
|
feat.setAttributes(attributes)
|
|
|
|
feat.setGeometry(QgsGeometry.fromPolyline([src, closest]))
|
|
|
|
writer.addFeature(feat)
|
|
feedback.setProgress(int(current * total))
|
|
|
|
del writer
|