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b1cadb1822
have specific icons, instead of generic qgis icon We consider these 'top level' algorithms, and using the standard algorithm icon should help reflect this and differentiate them from 3rd party algorithms.
100 lines
3.8 KiB
Python
100 lines
3.8 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Explode.py
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---------------------
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Date : August 2012
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Copyright : (C) 2012 by Victor Olaya
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Email : volayaf 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 range
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__author__ = 'Victor Olaya'
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__date__ = 'August 2012'
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__copyright__ = '(C) 2012, Victor Olaya'
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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 qgis.core import (QgsFeature,
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QgsGeometry,
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QgsFeatureSink,
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QgsWkbTypes,
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QgsApplication,
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QgsProcessingUtils)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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from processing.core.parameters import ParameterVector
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from processing.core.outputs import OutputVector
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from processing.tools import dataobjects
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class Explode(QgisAlgorithm):
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INPUT = 'INPUT'
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OUTPUT = 'OUTPUT'
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def group(self):
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return self.tr('Vector geometry tools')
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def __init__(self):
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super().__init__()
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self.addParameter(ParameterVector(self.INPUT,
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self.tr('Input layer'),
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[dataobjects.TYPE_VECTOR_LINE]))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Exploded'), datatype=[dataobjects.TYPE_VECTOR_LINE]))
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def name(self):
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return 'explodelines'
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def displayName(self):
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return self.tr('Explode lines')
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def processAlgorithm(self, parameters, context, feedback):
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vlayer = QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT), context)
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output = self.getOutputFromName(self.OUTPUT)
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fields = vlayer.fields()
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writer = output.getVectorWriter(fields, QgsWkbTypes.LineString, vlayer.crs(), context)
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outFeat = QgsFeature()
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features = QgsProcessingUtils.getFeatures(vlayer, context)
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total = 100.0 / vlayer.featureCount() if vlayer.featureCount() else 0
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for current, feature in enumerate(features):
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feedback.setProgress(int(current * total))
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inGeom = feature.geometry()
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atMap = feature.attributes()
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segments = self.extractAsSingleSegments(inGeom)
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outFeat.setAttributes(atMap)
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for segment in segments:
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outFeat.setGeometry(segment)
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writer.addFeature(outFeat, QgsFeatureSink.FastInsert)
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del writer
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def extractAsSingleSegments(self, geom):
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segments = []
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if geom.isMultipart():
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multi = geom.asMultiPolyline()
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for polyline in multi:
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segments.extend(self.getPolylineAsSingleSegments(polyline))
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else:
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segments.extend(self.getPolylineAsSingleSegments(
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geom.asPolyline()))
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return segments
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def getPolylineAsSingleSegments(self, polyline):
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segments = []
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for i in range(len(polyline) - 1):
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ptA = polyline[i]
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ptB = polyline[i + 1]
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segment = QgsGeometry.fromPolyline([ptA, ptB])
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segments.append(segment)
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return segments
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