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122 lines
4.5 KiB
Python
122 lines
4.5 KiB
Python
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# -*- 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 PyQt4.QtCore import *
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from qgis.core import *
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from sextante.core.GeoAlgorithm import GeoAlgorithm
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from sextante.core.QGisLayers import QGisLayers
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from sextante.parameters.ParameterVector import ParameterVector
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from sextante.parameters.ParameterNumber import ParameterNumber
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from sextante.parameters.ParameterBoolean import ParameterBoolean
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from sextante.outputs.OutputVector 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 = "Points displacement"
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self.group = "Vector geometry tools"
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self.addParameter(ParameterVector(self.INPUT_LAYER, "Input layer", ParameterVector.VECTOR_TYPE_POINT))
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self.addParameter(ParameterNumber(self.DISTANCE, "Displacement distance", 0.00001, 999999999.999990, 0.00015))
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self.addParameter(ParameterBoolean(self.HORIZONTAL, "Horizontal distribution for two point case"))
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self.addOutput(OutputVector(self.OUTPUT_LAYER, "Output layer"))
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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 = QGisLayers.getObjectFromUri(self.getParameterValue(self.INPUT_LAYER))
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provider = layer.dataProvider()
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writer = output.getVectorWriter(provider.fields(), provider.geometryType(), provider.crs())
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features = QGisLayers.features(layer)
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current = 0
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total = 100.0 / len(features)
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duplicates = dict()
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for f in 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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current += 1
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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() + 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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