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122 lines
4.6 KiB
Python
122 lines
4.6 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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PointsToPaths.py
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---------------------
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Date : April 2014
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Copyright : (C) 2014 by Alexander Bruy
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Email : alexander dot bruy at gmail 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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__author__ = 'Alexander Bruy'
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__date__ = 'April 2014'
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__copyright__ = '(C) 2014, Alexander Bruy'
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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 datetime import datetime
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from datetime import timedelta
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from PyQt4.QtCore import *
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from qgis.core import *
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from processing import interface
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.ProcessingLog import ProcessingLog
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from processing.parameters.ParameterVector import ParameterVector
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from processing.parameters.ParameterTableField import ParameterTableField
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from processing.parameters.ParameterString import ParameterString
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#from processing.parameters.ParameterNumber import ParameterNumber
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from processing.outputs.OutputVector import OutputVector
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from processing.tools import dataobjects, vector
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class PointsToPaths(GeoAlgorithm):
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VECTOR = 'VECTOR'
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GROUP_FIELD = 'GROUP_FIELD'
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ORDER_FIELD = 'ORDER_FIELD'
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DATE_FORMAT = 'DATE_FORMAT'
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#GAP_PERIOD = 'GAP_PERIOD'
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OUTPUT = 'OUTPUT'
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def defineCharacteristics(self):
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self.name = 'Points to path'
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self.group = 'Vector creation tools'
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self.addParameter(ParameterVector(self.VECTOR,
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'Input point layer', [ParameterVector.VECTOR_TYPE_POINT]))
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self.addParameter(
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ParameterTableField(self.GROUP_FIELD, 'Group field', self.VECTOR))
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self.addParameter(
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ParameterTableField(self.ORDER_FIELD, 'Order field', self.VECTOR))
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self.addParameter(ParameterString(self.DATE_FORMAT,
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'Date format (if order field is DateTime)', '', optional=True))
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#self.addParameter(ParameterNumber(
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# self.GAP_PERIOD,
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# 'Gap period (if order field is DateTime)', 0, 60, 0))
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self.addOutput(OutputVector(self.OUTPUT, 'Paths'))
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def processAlgorithm(self, progress):
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layer = dataobjects.getObjectFromUri(
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self.getParameterValue(self.VECTOR))
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groupField = self.getParameterValue(self.GROUP_FIELD)
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orderField = self.getParameterValue(self.ORDER_FIELD)
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dateFormat = unicode(self.getParameterValue(self.DATE_FORMAT))
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#gap = int(self.getParameterValue(self.GAP_PERIOD))
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fields = QgsFields()
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fields.append(QgsField('group', QVariant.String, '', 254, 0))
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fields.append(QgsField('begin', QVariant.String, '', 254, 0))
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fields.append(QgsField('end', QVariant.String, '', 254, 0))
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(
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fields, QGis.WKBLineString, layer.dataProvider().crs())
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points = dict()
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features = vector.features(layer)
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total = 100.0 / len(features)
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for count, f in enumerate(features):
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point = f.geometry().asPoint()
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group = f[groupField]
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order = f[orderField]
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if dateFormat != '':
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order = datetime.strptime(unicode(order), dateFormat)
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if group in points:
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points[group].append((order, point))
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else:
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points[group] = [(order, point)]
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progress.setPercentage(int(count * total))
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progress.setPercentage(0)
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count = 0
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total = 100.0 / len(points)
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for k, v in points.iteritems():
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v.sort()
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f = QgsFeature()
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f.initAttributes(len(fields))
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f.setFields(fields)
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f['group'] = k
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f['begin'] = v[0][0]
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f['end'] = v[-1][0]
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line = []
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for node in v:
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line.append(node[1])
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f.setGeometry(QgsGeometry.fromPolyline(line))
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writer.addFeature(f)
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count += 1
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progress.setPercentage(int(count * total))
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del writer
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