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3550cc99a6
Tags are used while searching in the toolbox. This should help with finding algorithms when the exact name is not known, eg you could search for "envelope" or "bounds" and find the 'Polygon from Layer Extent' algorithm. At the moment it's quite hard to discover algorithms which exist when you don't know what their called and have to instead search for every possible naming variant which could exist...
91 lines
3.2 KiB
Python
91 lines
3.2 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Smooth.py
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---------
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Date : July 2016
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Copyright : (C) 2016 by Nyall Dawson
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Email : nyall dot dawson 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__ = 'Nyall Dawson'
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__date__ = 'July 2016'
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__copyright__ = '(C) 2016, Nyall Dawson'
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# This will get replaced with a git SHA1 when you do a git archive323
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__revision__ = '$Format:%H$'
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import os
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from qgis.core import QgsFeature
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from qgis.PyQt.QtGui import QIcon
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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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, vector
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class MergeLines(GeoAlgorithm):
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INPUT_LAYER = 'INPUT_LAYER'
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OUTPUT_LAYER = 'OUTPUT_LAYER'
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def getIcon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'to_lines.png'))
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Merge lines')
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self.group, self.i18n_group = self.trAlgorithm('Vector geometry tools')
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self.tags = self.tr('line,merge,join,parts')
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self.addParameter(ParameterVector(self.INPUT_LAYER,
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self.tr('Input layer'), [dataobjects.TYPE_VECTOR_LINE]))
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self.addOutput(OutputVector(self.OUTPUT_LAYER, self.tr('Merged'), datatype=[dataobjects.TYPE_VECTOR_LINE]))
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def processAlgorithm(self, progress):
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layer = dataobjects.getObjectFromUri(
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self.getParameterValue(self.INPUT_LAYER))
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writer = self.getOutputFromName(
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self.OUTPUT_LAYER).getVectorWriter(
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layer.fields().toList(),
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layer.wkbType(),
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layer.crs())
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features = vector.features(layer)
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total = 100.0 / len(features)
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for current, inFeat in enumerate(features):
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outFeat = QgsFeature()
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attrs = inFeat.attributes()
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outFeat.setAttributes(attrs)
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inGeom = inFeat.geometry()
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if inGeom:
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outGeom = inGeom.mergeLines()
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if outGeom is None:
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raise GeoAlgorithmExecutionException(
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self.tr('Error merging lines'))
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outFeat.setGeometry(outGeom)
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writer.addFeature(outFeat)
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progress.setPercentage(int(current * total))
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del writer
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