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200 lines
6.2 KiB
Python
200 lines
6.2 KiB
Python
"""
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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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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 QMetaType
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from qgis.core import (
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QgsApplication,
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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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QgsPoint,
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QgsProcessing,
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QgsProcessingException,
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QgsProcessingParameterDistance,
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QgsProcessingParameterExtent,
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QgsProcessingParameterBoolean,
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QgsProcessingParameterCrs,
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QgsProcessingParameterFeatureSink,
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)
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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 QgsApplication.getThemeIcon("/algorithms/mAlgorithmRegularPoints.svg")
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def svgIconPath(self):
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return QgsApplication.iconPath("/algorithms/mAlgorithmRegularPoints.svg")
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def group(self):
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return self.tr("Vector creation")
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def groupId(self):
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return "vectorcreation"
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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(
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QgsProcessingParameterExtent(
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self.EXTENT, self.tr("Input extent"), optional=False
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)
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)
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self.addParameter(
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QgsProcessingParameterDistance(
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self.SPACING,
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self.tr("Point spacing/count"),
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100,
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self.CRS,
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False,
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0.000001,
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)
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)
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self.addParameter(
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QgsProcessingParameterDistance(
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self.INSET,
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self.tr("Initial inset from corner (LH side)"),
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0.0,
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self.CRS,
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False,
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0.0,
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)
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)
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self.addParameter(
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QgsProcessingParameterBoolean(
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self.RANDOMIZE, self.tr("Apply random offset to point spacing"), False
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)
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)
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self.addParameter(
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QgsProcessingParameterBoolean(
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self.IS_SPACING, self.tr("Use point spacing"), True
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)
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)
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self.addParameter(
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QgsProcessingParameterCrs(
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self.CRS, self.tr("Output layer CRS"), "ProjectCrs"
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)
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)
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self.addParameter(
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QgsProcessingParameterFeatureSink(
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self.OUTPUT,
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self.tr("Regular points"),
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QgsProcessing.SourceType.TypeVectorPoint,
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)
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)
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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.parameterAsBoolean(parameters, self.RANDOMIZE, context)
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isSpacing = self.parameterAsBoolean(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", QMetaType.Type.Int, "", 10, 0))
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(sink, dest_id) = self.parameterAsSink(
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parameters, self.OUTPUT, context, fields, QgsWkbTypes.Type.Point, crs
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)
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if sink is None:
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raise QgsProcessingException(self.invalidSinkError(parameters, self.OUTPUT))
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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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id = 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.constGet())
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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(
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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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)
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)
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else:
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geom = QgsGeometry(QgsPoint(x, y))
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if extent_engine.intersects(geom.constGet()):
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f.setAttributes([id])
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f.setGeometry(geom)
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sink.addFeature(f, QgsFeatureSink.Flag.FastInsert)
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x += pSpacing
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id += 1
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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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sink.finalize()
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return {self.OUTPUT: dest_id}
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