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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.
138 lines
5.2 KiB
Python
138 lines
5.2 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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PointsDisplacement.py
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---------------------
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Date : July 2013
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Copyright : (C) 2013 by Alexander Bruy
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Email : alexander dot bruy 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 next
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__author__ = 'Alexander Bruy'
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__date__ = 'July 2013'
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__copyright__ = '(C) 2013, Alexander Bruy'
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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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import math
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from qgis.core import (QgsApplication,
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QgsFeatureRequest,
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QgsFeature,
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QgsGeometry,
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QgsPoint,
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QgsProcessingUtils)
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from processing.tools import dataobjects, vector
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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.parameters import ParameterBoolean
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from processing.core.outputs import OutputVector
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class PointsDisplacement(GeoAlgorithm):
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INPUT_LAYER = 'INPUT_LAYER'
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DISTANCE = 'DISTANCE'
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HORIZONTAL = 'HORIZONTAL'
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OUTPUT_LAYER = 'OUTPUT_LAYER'
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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 'pointsdisplacement'
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def displayName(self):
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return self.tr('Points displacement')
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def defineCharacteristics(self):
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self.addParameter(ParameterVector(self.INPUT_LAYER,
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self.tr('Input layer'), [dataobjects.TYPE_VECTOR_POINT]))
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self.addParameter(ParameterNumber(self.DISTANCE,
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self.tr('Displacement distance'),
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0.00001, 999999999.999990, 0.00015))
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self.addParameter(ParameterBoolean(self.HORIZONTAL,
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self.tr('Horizontal distribution for two point case')))
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self.addOutput(OutputVector(self.OUTPUT_LAYER, self.tr('Displaced'), datatype=[dataobjects.TYPE_VECTOR_POINT]))
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def processAlgorithm(self, context, feedback):
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radius = self.getParameterValue(self.DISTANCE)
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horizontal = self.getParameterValue(self.HORIZONTAL)
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output = self.getOutputFromName(self.OUTPUT_LAYER)
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layer = dataobjects.QgsProcessingUtils.mapLayerFromString(self.getParameterValue(self.INPUT_LAYER), context)
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writer = output.getVectorWriter(layer.fields(), 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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duplicates = dict()
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for current, f in enumerate(features):
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wkt = f.geometry().exportToWkt()
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if wkt not in duplicates:
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duplicates[wkt] = [f.id()]
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else:
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duplicates[wkt].extend([f.id()])
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feedback.setProgress(int(current * total))
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current = 0
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total = 100.0 / len(duplicates)
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feedback.setProgress(0)
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fullPerimeter = 2 * math.pi
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for (geom, fids) in list(duplicates.items()):
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count = len(fids)
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if count == 1:
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f = next(layer.getFeatures(QgsFeatureRequest().setFilterFid(fids[0])))
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writer.addFeature(f)
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else:
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angleStep = fullPerimeter / count
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if count == 2 and horizontal:
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currentAngle = math.pi / 2
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else:
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currentAngle = 0
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old_point = QgsGeometry.fromWkt(geom).asPoint()
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request = QgsFeatureRequest().setFilterFids(fids).setFlags(QgsFeatureRequest.NoGeometry)
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for f in layer.getFeatures(request):
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sinusCurrentAngle = math.sin(currentAngle)
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cosinusCurrentAngle = math.cos(currentAngle)
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dx = radius * sinusCurrentAngle
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dy = radius * cosinusCurrentAngle
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new_point = QgsPoint(old_point.x() + dx, old_point.y() + dy)
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out_feature = QgsFeature()
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out_feature.setGeometry(QgsGeometry.fromPoint(new_point))
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out_feature.setAttributes(f.attributes())
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writer.addFeature(out_feature)
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currentAngle += angleStep
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current += 1
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feedback.setProgress(int(current * total))
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del writer
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