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06c4b07222
Since the layer has more complete knowledge of the crs (ie, when provider could not determine crs and user has selected it from the list), and also better knowledge of layer fields (virtual fields, joined fields) we should use these rather than the provider methods.
147 lines
5.7 KiB
Python
147 lines
5.7 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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import os
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from datetime import datetime
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from qgis.PyQt.QtCore import QVariant
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from qgis.core import Qgis, QgsFeature, QgsFields, QgsField, QgsGeometry, QgsDistanceArea, QgsWkbTypes
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from processing.core.GeoAlgorithm import GeoAlgorithm
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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 ParameterString
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from processing.core.outputs import OutputVector
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from processing.core.outputs import OutputDirectory
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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_LINES = 'OUTPUT_LINES'
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OUTPUT_TEXT = 'OUTPUT_TEXT'
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Points to path')
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self.group, self.i18n_group = self.trAlgorithm('Vector creation tools')
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self.addParameter(ParameterVector(self.VECTOR,
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self.tr('Input point layer'), [ParameterVector.VECTOR_TYPE_POINT]))
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self.addParameter(ParameterTableField(self.GROUP_FIELD,
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self.tr('Group field'), self.VECTOR))
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self.addParameter(ParameterTableField(self.ORDER_FIELD,
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self.tr('Order field'), self.VECTOR))
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self.addParameter(ParameterString(self.DATE_FORMAT,
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self.tr('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_LINES, self.tr('Paths')))
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self.addOutput(OutputDirectory(self.OUTPUT_TEXT, self.tr('Directory')))
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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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dirName = self.getOutputValue(self.OUTPUT_TEXT)
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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_LINES).getVectorWriter(
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fields, QgsWkbTypes.LineString, layer.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 current, 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(current * total))
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progress.setPercentage(0)
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da = QgsDistanceArea()
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current = 0
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total = 100.0 / len(points)
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for group, vertices in points.iteritems():
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vertices.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'] = group
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f['begin'] = vertices[0][0]
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f['end'] = vertices[-1][0]
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fileName = os.path.join(dirName, '%s.txt' % group)
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fl = open(fileName, 'w')
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fl.write('angle=Azimuth\n')
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fl.write('heading=Coordinate_System\n')
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fl.write('dist_units=Default\n')
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line = []
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i = 0
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for node in vertices:
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line.append(node[1])
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if i == 0:
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fl.write('startAt=%f;%f;90\n' % (node[1].x(), node[1].y()))
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fl.write('survey=Polygonal\n')
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fl.write('[data]\n')
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else:
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angle = line[i - 1].azimuth(line[i])
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distance = da.measureLine(line[i - 1], line[i])
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fl.write('%f;%f;90\n' % (angle, distance))
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i += 1
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f.setGeometry(QgsGeometry.fromPolyline(line))
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writer.addFeature(f)
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current += 1
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progress.setPercentage(int(current * total))
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del writer
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fl.close()
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