mirror of
https://github.com/qgis/QGIS.git
synced 2025-03-02 00:02:12 -05:00
e7fe61e6b9
available or compatible QGIS version is used Some housekeeping in QGIS algorithms provider
88 lines
3.4 KiB
Python
88 lines
3.4 KiB
Python
# -*- coding: utf-8 -*-
|
|
|
|
"""
|
|
***************************************************************************
|
|
Explode.py
|
|
---------------------
|
|
Date : August 2012
|
|
Copyright : (C) 2012 by Victor Olaya
|
|
Email : volayaf 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__ = 'Victor Olaya'
|
|
__date__ = 'August 2012'
|
|
__copyright__ = '(C) 2012, Victor Olaya'
|
|
|
|
# This will get replaced with a git SHA1 when you do a git archive
|
|
|
|
__revision__ = '$Format:%H$'
|
|
|
|
from qgis.core import QGis, QgsFeature, QgsGeometry
|
|
from processing.core.GeoAlgorithm import GeoAlgorithm
|
|
from processing.core.parameters import ParameterVector
|
|
from processing.core.outputs import OutputVector
|
|
from processing.tools import dataobjects, vector
|
|
|
|
|
|
class Explode(GeoAlgorithm):
|
|
|
|
INPUT = 'INPUT'
|
|
OUTPUT = 'OUTPUT'
|
|
|
|
def defineCharacteristics(self):
|
|
self.name, self.i18n_name = self.trAlgorithm('Explode lines')
|
|
self.group, self.i18n_group = self.trAlgorithm('Vector geometry tools')
|
|
self.addParameter(ParameterVector(self.INPUT,
|
|
self.tr('Input layer'), [ParameterVector.VECTOR_TYPE_LINE]))
|
|
self.addOutput(OutputVector(self.OUTPUT, self.tr('Exploded')))
|
|
|
|
def processAlgorithm(self, progress):
|
|
vlayer = dataobjects.getObjectFromUri(
|
|
self.getParameterValue(self.INPUT))
|
|
output = self.getOutputFromName(self.OUTPUT)
|
|
vprovider = vlayer.dataProvider()
|
|
fields = vprovider.fields()
|
|
writer = output.getVectorWriter(fields, QGis.WKBLineString,
|
|
vlayer.crs())
|
|
outFeat = QgsFeature()
|
|
features = vector.features(vlayer)
|
|
total = 100.0 / len(features)
|
|
for current, feature in enumerate(features):
|
|
progress.setPercentage(int(current * total))
|
|
inGeom = feature.geometry()
|
|
atMap = feature.attributes()
|
|
segments = self.extractAsSingleSegments(inGeom)
|
|
outFeat.setAttributes(atMap)
|
|
for segment in segments:
|
|
outFeat.setGeometry(segment)
|
|
writer.addFeature(outFeat)
|
|
del writer
|
|
|
|
def extractAsSingleSegments(self, geom):
|
|
segments = []
|
|
if geom.isMultipart():
|
|
multi = geom.asMultiPolyline()
|
|
for polyline in multi:
|
|
segments.extend(self.getPolylineAsSingleSegments(polyline))
|
|
else:
|
|
segments.extend(self.getPolylineAsSingleSegments(
|
|
geom.asPolyline()))
|
|
return segments
|
|
|
|
def getPolylineAsSingleSegments(self, polyline):
|
|
segments = []
|
|
for i in range(len(polyline) - 1):
|
|
ptA = polyline[i]
|
|
ptB = polyline[i + 1]
|
|
segment = QgsGeometry.fromPolyline([ptA, ptB])
|
|
segments.append(segment)
|
|
return segments
|