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153 lines
6.0 KiB
Python
153 lines
6.0 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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from builtins import str
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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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import os
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from random import seed, uniform
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from math import sqrt
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from qgis.PyQt.QtGui import QIcon
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from qgis.PyQt.QtCore import QVariant
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from qgis.core import (QgsFields,
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QgsFeatureSink,
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QgsField,
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QgsFeature,
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QgsWkbTypes,
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QgsGeometry,
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QgsPointXY,
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QgsProcessing,
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QgsProcessingParameterExtent,
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QgsProcessingParameterNumber,
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QgsProcessingParameterBoolean,
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QgsProcessingParameterCrs,
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QgsProcessingParameterFeatureSink)
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from processing.algs.qgis.QgisAlgorithm import QgisAlgorithm
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pluginPath = os.path.split(os.path.split(os.path.dirname(__file__))[0])[0]
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class RegularPoints(QgisAlgorithm):
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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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CRS = 'CRS'
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def icon(self):
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return QIcon(os.path.join(pluginPath, 'images', 'ftools', 'regular_points.png'))
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def group(self):
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return self.tr('Vector creation')
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def __init__(self):
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super().__init__()
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def initAlgorithm(self, config=None):
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self.addParameter(QgsProcessingParameterExtent(self.EXTENT,
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self.tr('Input extent'), optional=False))
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self.addParameter(QgsProcessingParameterNumber(self.SPACING,
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self.tr('Point spacing/count'), QgsProcessingParameterNumber.Double, 100, False, 0.000001, 999999999.999999999))
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self.addParameter(QgsProcessingParameterNumber(self.INSET,
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self.tr('Initial inset from corner (LH side)'), QgsProcessingParameterNumber.Double, 0.0, False, 0.0, 9999.9999))
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self.addParameter(QgsProcessingParameterBoolean(self.RANDOMIZE,
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self.tr('Apply random offset to point spacing'), False))
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self.addParameter(QgsProcessingParameterBoolean(self.IS_SPACING,
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self.tr('Use point spacing'), True))
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self.addParameter(QgsProcessingParameterCrs(self.CRS,
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self.tr('Output layer CRS'), 'ProjectCrs'))
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self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Regular points'), QgsProcessing.TypeVectorPoint))
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def name(self):
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return 'regularpoints'
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def displayName(self):
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return self.tr('Regular points')
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def processAlgorithm(self, parameters, context, feedback):
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spacing = self.parameterAsDouble(parameters, self.SPACING, context)
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inset = self.parameterAsDouble(parameters, self.INSET, context)
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randomize = self.parameterAsBool(parameters, self.RANDOMIZE, context)
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isSpacing = self.parameterAsBool(parameters, self.IS_SPACING, context)
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crs = self.parameterAsCrs(parameters, self.CRS, context)
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extent = self.parameterAsExtent(parameters, self.EXTENT, context, crs)
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fields = QgsFields()
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fields.append(QgsField('id', QVariant.Int, '', 10, 0))
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(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
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fields, QgsWkbTypes.Point, crs)
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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 = 100.0 / (area / pSpacing)
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y = extent.yMaximum() - inset
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extent_geom = QgsGeometry.fromRect(extent)
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extent_engine = QgsGeometry.createGeometryEngine(extent_geom.geometry())
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extent_engine.prepareGeometry()
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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 feedback.isCanceled():
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break
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if randomize:
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geom = QgsGeometry().fromPoint(QgsPointXY(
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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(QgsPointXY(x, y))
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if extent_engine.intersects(geom.geometry()):
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f.setAttribute('id', count)
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f.setGeometry(geom)
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sink.addFeature(f, QgsFeatureSink.FastInsert)
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x += pSpacing
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count += 1
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feedback.setProgress(int(count * total))
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y = y - pSpacing
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return {self.OUTPUT: dest_id}
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