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[processing] add points displacement algorithm
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# -*- coding: utf-8 -*- | ||
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""" | ||
*************************************************************************** | ||
PointsDisplacement.py | ||
--------------------- | ||
Date : July 2013 | ||
Copyright : (C) 2013 by Alexander Bruy | ||
Email : alexander dot bruy at gmail dot com | ||
*************************************************************************** | ||
* * | ||
* This program is free software; you can redistribute it and/or modify * | ||
* it under the terms of the GNU General Public License as published by * | ||
* the Free Software Foundation; either version 2 of the License, or * | ||
* (at your option) any later version. * | ||
* * | ||
*************************************************************************** | ||
""" | ||
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__author__ = 'Alexander Bruy' | ||
__date__ = 'July 2013' | ||
__copyright__ = '(C) 2013, Alexander Bruy' | ||
# This will get replaced with a git SHA1 when you do a git archive | ||
__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 | ||
from sextante.core.QGisLayers import QGisLayers | ||
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from sextante.parameters.ParameterVector import ParameterVector | ||
from sextante.parameters.ParameterNumber import ParameterNumber | ||
from sextante.parameters.ParameterBoolean import ParameterBoolean | ||
from sextante.outputs.OutputVector import OutputVector | ||
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class PointsDisplacement(GeoAlgorithm): | ||
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INPUT_LAYER = "INPUT_LAYER" | ||
DISTANCE = "DISTANCE" | ||
HORIZONTAL = "HORIZONTAL" | ||
OUTPUT_LAYER = "OUTPUT_LAYER" | ||
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def defineCharacteristics(self): | ||
self.name = "Points displacement" | ||
self.group = "Vector geometry tools" | ||
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self.addParameter(ParameterVector(self.INPUT_LAYER, "Input layer", ParameterVector.VECTOR_TYPE_POINT)) | ||
self.addParameter(ParameterNumber(self.DISTANCE, "Displacement distance", 0.00001, 999999999.999990, 0.00015)) | ||
self.addParameter(ParameterBoolean(self.HORIZONTAL, "Horizontal distribution for two point case")) | ||
self.addOutput(OutputVector(self.OUTPUT_LAYER, "Output layer")) | ||
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def processAlgorithm(self, progress): | ||
radius = self.getParameterValue(self.DISTANCE) | ||
horizontal = self.getParameterValue(self.HORIZONTAL) | ||
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() | ||
writer = output.getVectorWriter(provider.fields(), provider.geometryType(), provider.crs()) | ||
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features = QGisLayers.features(layer) | ||
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current = 0 | ||
total = 100.0 / len(features) | ||
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duplicates = dict() | ||
for f in features: | ||
wkt = f.geometry().exportToWkt() | ||
if wkt not in duplicates: | ||
duplicates[wkt] = [f.id()] | ||
else: | ||
duplicates[wkt].extend([f.id()]) | ||
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current += 1 | ||
progress.setPercentage(int(current * total)) | ||
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current = 0 | ||
total = 100.0 / len(duplicates) | ||
progress.setPercentage(0) | ||
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fullPerimeter = 2 * math.pi | ||
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request = QgsFeatureRequest() | ||
for geom, fids in duplicates.iteritems(): | ||
count = len(fids) | ||
if count == 1: | ||
f = layer.getFeatures(request.setFilterFid(fids[0])).next() | ||
writer.addFeature(f) | ||
else: | ||
angleStep = fullPerimeter / count | ||
if count == 2 and horizontal: | ||
currentAngle = math.pi / 2 | ||
else: | ||
currentAngle = 0 | ||
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old_point = QgsGeometry.fromWkt(geom).asPoint() | ||
for fid in fids: | ||
sinusCurrentAngle = math.sin(currentAngle) | ||
cosinusCurrentAngle = math.cos(currentAngle) | ||
dx = radius * sinusCurrentAngle | ||
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) | ||
out_feature = QgsFeature() | ||
out_feature.setGeometry(QgsGeometry.fromPoint(new_point)) | ||
out_feature.setAttributes(f.attributes()) | ||
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writer.addFeature(out_feature) | ||
currentAngle += angleStep | ||
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current += 1 | ||
progress.setPercentage(int(current * total)) | ||
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del writer |