mirror of
https://github.com/qgis/QGIS.git
synced 2025-11-04 00:04:25 -05:00
96 lines
3.5 KiB
Python
96 lines
3.5 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
ReverseLineDirection.py
|
|
-----------------------
|
|
Date : November 2015
|
|
Copyright : (C) 2015 by Nyall Dawson
|
|
Email : nyall dot dawson at gmail 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. *
|
|
* *
|
|
***************************************************************************
|
|
"""
|
|
|
|
__author__ = 'Nyall Dawson'
|
|
__date__ = 'November 2015'
|
|
__copyright__ = '(C) 2015, Nyall Dawson'
|
|
|
|
# This will get replaced with a git SHA1 when you do a git archive323
|
|
|
|
__revision__ = '$Format:%H$'
|
|
|
|
from qgis.core import (QgsApplication,
|
|
QgsGeometry,
|
|
QgsFeature,
|
|
QgsProcessingUtils)
|
|
from processing.core.GeoAlgorithm import GeoAlgorithm
|
|
from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
|
|
from processing.core.parameters import ParameterVector
|
|
from processing.core.outputs import OutputVector
|
|
from processing.tools import dataobjects, vector
|
|
|
|
|
|
class ReverseLineDirection(GeoAlgorithm):
|
|
|
|
INPUT_LAYER = 'INPUT_LAYER'
|
|
OUTPUT_LAYER = 'OUTPUT_LAYER'
|
|
|
|
def icon(self):
|
|
return QgsApplication.getThemeIcon("/providerQgis.svg")
|
|
|
|
def svgIconPath(self):
|
|
return QgsApplication.iconPath("providerQgis.svg")
|
|
|
|
def group(self):
|
|
return self.tr('Vector geometry tools')
|
|
|
|
def name(self):
|
|
return 'reverselinedirection'
|
|
|
|
def displayName(self):
|
|
return self.tr('Reverse line direction')
|
|
|
|
def defineCharacteristics(self):
|
|
self.addParameter(ParameterVector(self.INPUT_LAYER,
|
|
self.tr('Input layer'), [dataobjects.TYPE_VECTOR_LINE]))
|
|
self.addOutput(OutputVector(self.OUTPUT_LAYER, self.tr('Reversed'), datatype=[dataobjects.TYPE_VECTOR_LINE]))
|
|
|
|
def processAlgorithm(self, context, feedback):
|
|
layer = dataobjects.getLayerFromString(
|
|
self.getParameterValue(self.INPUT_LAYER))
|
|
|
|
writer = self.getOutputFromName(
|
|
self.OUTPUT_LAYER).getVectorWriter(
|
|
layer.fields().toList(),
|
|
layer.wkbType(),
|
|
layer.crs())
|
|
|
|
outFeat = QgsFeature()
|
|
|
|
features = QgsProcessingUtils.getFeatures(layer, context)
|
|
total = 100.0 / QgsProcessingUtils.featureCount(layer, context)
|
|
for current, inFeat in enumerate(features):
|
|
inGeom = inFeat.geometry()
|
|
attrs = inFeat.attributes()
|
|
|
|
outGeom = None
|
|
if not inGeom.isNull():
|
|
reversedLine = inGeom.geometry().reversed()
|
|
if not reversedLine:
|
|
raise GeoAlgorithmExecutionException(
|
|
self.tr('Error reversing line'))
|
|
outGeom = QgsGeometry(reversedLine)
|
|
|
|
outFeat.setGeometry(outGeom)
|
|
outFeat.setAttributes(attrs)
|
|
writer.addFeature(outFeat)
|
|
feedback.setProgress(int(current * total))
|
|
|
|
del writer
|