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Algorithms and other processing code should use this method (instead of dataobjects.getLayerFromString) to retrieve layers from a string, as it considers the processing context and allows resolving strings to temporarily stored layers. This permits processing models to function correctly when intermediate results are stored as memory layers. Subsequent model algorithms can then access these temporary layers as inputs. All temporary layers will be removed when the context object is destroyed after the model algorithm is run.
166 lines
6.4 KiB
Python
166 lines
6.4 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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from builtins import str
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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 (QgsApplication,
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QgsFeature,
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QgsFields,
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QgsField,
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QgsGeometry,
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QgsDistanceArea,
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QgsWkbTypes,
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QgsProcessingUtils)
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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 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 creation tools')
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def name(self):
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return 'pointstopath'
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def displayName(self):
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return self.tr('Points to path')
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def defineCharacteristics(self):
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self.addParameter(ParameterVector(self.VECTOR,
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self.tr('Input point layer'), [dataobjects.TYPE_VECTOR_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'), datatype=[dataobjects.TYPE_VECTOR_LINE]))
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self.addOutput(OutputDirectory(self.OUTPUT_TEXT, self.tr('Directory')))
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def processAlgorithm(self, context, feedback):
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layer = dataobjects.QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.VECTOR), context)
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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 = str(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(fields, QgsWkbTypes.LineString, layer.crs(),
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context)
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points = dict()
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features = QgsProcessingUtils.getFeatures(layer, context)
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total = 100.0 / QgsProcessingUtils.featureCount(layer, context)
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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(str(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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feedback.setProgress(int(current * total))
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feedback.setProgress(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 list(points.items()):
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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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with open(fileName, 'w') as fl:
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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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feedback.setProgress(int(current * total))
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del writer
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