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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.
134 lines
5.2 KiB
Python
134 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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QgsFeatureSink,
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QgsGeometry,
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QgsPointXY,
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QgsProcessingUtils)
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from processing.tools import dataobjects
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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.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(QgisAlgorithm):
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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 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_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 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 processAlgorithm(self, parameters, 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 = 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 / layer.featureCount() if layer.featureCount() else 0
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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) if duplicates else 1
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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, QgsFeatureSink.FastInsert)
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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 = QgsPointXY(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, QgsFeatureSink.FastInsert)
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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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