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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.
96 lines
3.5 KiB
Python
96 lines
3.5 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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DensifyGeometriesInterval.py by Anita Graser, Dec 2012
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based on DensifyGeometries.py
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---------------------
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Date : October 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__ = 'Anita Graser'
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__date__ = 'Dec 2012'
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__copyright__ = '(C) 2012, Anita Graser'
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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 math import sqrt
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from qgis.core import (QgsPoint,
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QgsGeometry,
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QgsWkbTypes,
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QgsApplication,
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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 ParameterNumber
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from processing.core.outputs import OutputVector
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from processing.tools import dataobjects, vector
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class DensifyGeometriesInterval(GeoAlgorithm):
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INPUT = 'INPUT'
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INTERVAL = 'INTERVAL'
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OUTPUT = 'OUTPUT'
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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 geometry tools')
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def name(self):
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return 'densifygeometriesgivenaninterval'
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def displayName(self):
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return self.tr('Densify geometries given an interval')
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def defineCharacteristics(self):
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self.addParameter(ParameterVector(self.INPUT,
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self.tr('Input layer'),
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[dataobjects.TYPE_VECTOR_POLYGON, dataobjects.TYPE_VECTOR_LINE]))
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self.addParameter(ParameterNumber(self.INTERVAL,
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self.tr('Interval between vertices to add'), 0.0, 10000000.0, 1.0))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Densified')))
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def processAlgorithm(self, context, feedback):
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layer = dataobjects.QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT), context)
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interval = self.getParameterValue(self.INTERVAL)
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isPolygon = layer.geometryType() == QgsWkbTypes.PolygonGeometry
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writer = self.getOutputFromName(
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self.OUTPUT).getVectorWriter(layer.fields().toList(), layer.wkbType(), layer.crs(), context)
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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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feature = f
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if feature.hasGeometry():
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new_geometry = feature.geometry().densifyByCount(float(interval))
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feature.setGeometry(new_geometry)
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writer.addFeature(feature)
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feedback.setProgress(int(current * total))
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del writer
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