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06c4b07222
Since the layer has more complete knowledge of the crs (ie, when provider could not determine crs and user has selected it from the list), and also better knowledge of layer fields (virtual fields, joined fields) we should use these rather than the provider methods.
123 lines
4.8 KiB
Python
123 lines
4.8 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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__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 QgsFeatureRequest, QgsFeature, QgsGeometry, QgsPoint
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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 defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Points displacement')
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self.group, self.i18n_group = self.trAlgorithm('Vector geometry tools')
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self.addParameter(ParameterVector(self.INPUT_LAYER,
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self.tr('Input layer'), [ParameterVector.VECTOR_TYPE_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')))
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def processAlgorithm(self, progress):
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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.getObjectFromUri(self.getParameterValue(self.INPUT_LAYER))
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writer = output.getVectorWriter(layer.fields(),
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layer.wkbType(), layer.crs())
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features = vector.features(layer)
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total = 100.0 / len(features)
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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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progress.setPercentage(int(current * total))
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current = 0
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total = 100.0 / len(duplicates)
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progress.setPercentage(0)
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fullPerimeter = 2 * math.pi
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request = QgsFeatureRequest()
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for (geom, fids) in duplicates.iteritems():
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count = len(fids)
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if count == 1:
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f = layer.getFeatures(request.setFilterFid(fids[0])).next()
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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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for fid in fids:
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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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f = layer.getFeatures(request.setFilterFid(fid)).next()
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new_point = QgsPoint(old_point.x() + dx, old_point.y()
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+ 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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progress.setPercentage(int(current * total))
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del writer
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