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120 lines
4.7 KiB
Python
120 lines
4.7 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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RegularPoints.py
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---------------------
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Date : September 2014
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Copyright : (C) 2014 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__ = 'September 2014'
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__copyright__ = '(C) 2014, 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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from random import seed, uniform
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from math import sqrt
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from PyQt4.QtCore import QVariant
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from qgis.core import QGis, QgsRectangle, QgsFields, QgsField, QgsFeature, QgsGeometry, QgsPoint
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from qgis.utils import iface
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.parameters import ParameterExtent
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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 RegularPoints(GeoAlgorithm):
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EXTENT = 'EXTENT'
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SPACING = 'SPACING'
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INSET = 'INSET'
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RANDOMIZE = 'RANDOMIZE'
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IS_SPACING = 'IS_SPACING'
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OUTPUT = 'OUTPUT'
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Regular points')
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self.group, self.i18n_group = self.trAlgorithm('Vector creation tools')
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self.addParameter(ParameterExtent(self.EXTENT,
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self.tr('Input extent')))
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self.addParameter(ParameterNumber(self.SPACING,
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self.tr('Point spacing/count'), 0.0001, 999999999.999999999, 0.0001))
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self.addParameter(ParameterNumber(self.INSET,
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self.tr('Initial inset from corner (LH side)'), 0.0, 9999.9999, 0.0))
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self.addParameter(ParameterBoolean(self.RANDOMIZE,
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self.tr('Apply random offset to point spacing'), False))
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self.addParameter(ParameterBoolean(self.IS_SPACING,
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self.tr('Use point spacing'), True))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Regular points')))
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def processAlgorithm(self, progress):
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extent = unicode(self.getParameterValue(self.EXTENT)).split(',')
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spacing = float(self.getParameterValue(self.SPACING))
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inset = float(self.getParameterValue(self.INSET))
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randomize = self.getParameterValue(self.RANDOMIZE)
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isSpacing = self.getParameterValue(self.IS_SPACING)
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extent = QgsRectangle(float(extent[0]), float(extent[2]),
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float(extent[1]), float(extent[3]))
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fields = QgsFields()
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fields.append(QgsField('id', QVariant.Int, '', 10, 0))
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mapCRS = iface.mapCanvas().mapSettings().destinationCrs()
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(
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fields, QGis.WKBPoint, mapCRS)
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if randomize:
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seed()
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area = extent.width() * extent.height()
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if isSpacing:
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pSpacing = spacing
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else:
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pSpacing = sqrt(area / spacing)
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f = QgsFeature()
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f.initAttributes(1)
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f.setFields(fields)
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count = 0
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total = 100.00 / (area / pSpacing)
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y = extent.yMaximum() - inset
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while y >= extent.yMinimum():
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x = extent.xMinimum() + inset
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while x <= extent.xMaximum():
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if randomize:
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geom = QgsGeometry().fromPoint(QgsPoint(
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uniform(x - (pSpacing / 2.0), x + (pSpacing / 2.0)),
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uniform(y - (pSpacing / 2.0), y + (pSpacing / 2.0))))
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else:
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geom = QgsGeometry().fromPoint(QgsPoint(x, y))
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if geom.intersects(extent):
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f.setAttribute('id', count)
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f.setGeometry(geom)
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writer.addFeature(f)
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x += pSpacing
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count += 1
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progress.setPercentage(int(count * total))
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y = y - pSpacing
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del writer
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