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435 lines
17 KiB
Python
435 lines
17 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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Grid.py
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---------------------
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Date : May 2010
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Copyright : (C) 2010 by Michael Minn
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Email : pyqgis at michaelminn 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__ = 'Michael Minn'
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__date__ = 'May 2010'
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__copyright__ = '(C) 2010, Michael Minn'
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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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import math
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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 (QgsApplication,
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QgsField,
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QgsFeatureSink,
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QgsFeature,
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QgsGeometry,
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QgsLineString,
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QgsPoint,
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QgsPointXY,
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QgsWkbTypes,
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QgsProcessing,
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QgsProcessingException,
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QgsProcessingParameterEnum,
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QgsProcessingParameterExtent,
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QgsProcessingParameterNumber,
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QgsProcessingParameterDistance,
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QgsProcessingParameterCrs,
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QgsProcessingParameterFeatureSink,
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QgsFields)
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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 Grid(QgisAlgorithm):
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TYPE = 'TYPE'
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EXTENT = 'EXTENT'
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HSPACING = 'HSPACING'
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VSPACING = 'VSPACING'
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HOVERLAY = 'HOVERLAY'
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VOVERLAY = 'VOVERLAY'
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CRS = 'CRS'
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OUTPUT = 'OUTPUT'
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def icon(self):
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return QgsApplication.getThemeIcon("/algorithms/mAlgorithmCreateGrid.svg")
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def svgIconPath(self):
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return QgsApplication.iconPath("/algorithms/mAlgorithmCreateGrid.svg")
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def tags(self):
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return self.tr('grid,lines,polygons,vector,create,fishnet,diamond,hexagon').split(',')
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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.types = [self.tr('Point'),
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self.tr('Line'),
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self.tr('Rectangle (polygon)'),
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self.tr('Diamond (polygon)'),
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self.tr('Hexagon (polygon)')]
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self.addParameter(QgsProcessingParameterEnum(self.TYPE,
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self.tr('Grid type'), self.types))
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self.addParameter(QgsProcessingParameterExtent(self.EXTENT, self.tr('Grid extent')))
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self.addParameter(QgsProcessingParameterDistance(self.HSPACING,
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self.tr('Horizontal spacing'),
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1.0, self.CRS, False, 0, 1000000000.0))
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self.addParameter(QgsProcessingParameterDistance(self.VSPACING,
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self.tr('Vertical spacing'),
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1.0, self.CRS, False, 0, 1000000000.0))
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self.addParameter(QgsProcessingParameterDistance(self.HOVERLAY,
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self.tr('Horizontal overlay'),
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0.0, self.CRS, False, 0, 1000000000.0))
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self.addParameter(QgsProcessingParameterDistance(self.VOVERLAY,
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self.tr('Vertical overlay'),
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0.0, self.CRS, False, 0, 1000000000.0))
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self.addParameter(QgsProcessingParameterCrs(self.CRS, 'Grid CRS', 'ProjectCrs'))
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self.addParameter(QgsProcessingParameterFeatureSink(self.OUTPUT, self.tr('Grid'), type=QgsProcessing.TypeVectorPolygon))
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def name(self):
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return 'creategrid'
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def displayName(self):
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return self.tr('Create grid')
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def processAlgorithm(self, parameters, context, feedback):
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idx = self.parameterAsEnum(parameters, self.TYPE, context)
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hSpacing = self.parameterAsDouble(parameters, self.HSPACING, context)
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vSpacing = self.parameterAsDouble(parameters, self.VSPACING, context)
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hOverlay = self.parameterAsDouble(parameters, self.HOVERLAY, context)
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vOverlay = self.parameterAsDouble(parameters, self.VOVERLAY, context)
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crs = self.parameterAsCrs(parameters, self.CRS, context)
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bbox = self.parameterAsExtent(parameters, self.EXTENT, context, crs)
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if hSpacing <= 0 or vSpacing <= 0:
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raise QgsProcessingException(
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self.tr('Invalid grid spacing: {0}/{1}').format(hSpacing, vSpacing))
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if bbox.width() < hSpacing:
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raise QgsProcessingException(
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self.tr('Horizontal spacing is too large for the covered area'))
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if hSpacing <= hOverlay or vSpacing <= vOverlay:
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raise QgsProcessingException(
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self.tr('Invalid overlay: {0}/{1}').format(hOverlay, vOverlay))
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if bbox.height() < vSpacing:
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raise QgsProcessingException(
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self.tr('Vertical spacing is too large for the covered area'))
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fields = QgsFields()
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fields.append(QgsField('left', QVariant.Double, '', 24, 16))
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fields.append(QgsField('top', QVariant.Double, '', 24, 16))
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fields.append(QgsField('right', QVariant.Double, '', 24, 16))
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fields.append(QgsField('bottom', QVariant.Double, '', 24, 16))
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fields.append(QgsField('id', QVariant.Int, '', 10, 0))
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if idx == 0:
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outputWkb = QgsWkbTypes.Point
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elif idx == 1:
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outputWkb = QgsWkbTypes.LineString
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else:
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outputWkb = QgsWkbTypes.Polygon
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(sink, dest_id) = self.parameterAsSink(parameters, self.OUTPUT, context,
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fields, outputWkb, crs)
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if sink is None:
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raise QgsProcessingException(self.invalidSinkError(parameters, self.OUTPUT))
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if idx == 0:
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self._pointGrid(
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sink, bbox, hSpacing, vSpacing, hOverlay, vOverlay, feedback)
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elif idx == 1:
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self._lineGrid(
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sink, bbox, hSpacing, vSpacing, hOverlay, vOverlay, feedback)
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elif idx == 2:
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self._rectangleGrid(
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sink, bbox, hSpacing, vSpacing, hOverlay, vOverlay, feedback)
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elif idx == 3:
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self._diamondGrid(
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sink, bbox, hSpacing, vSpacing, hOverlay, vOverlay, feedback)
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elif idx == 4:
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self._hexagonGrid(
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sink, bbox, hSpacing, vSpacing, hOverlay, vOverlay, feedback)
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return {self.OUTPUT: dest_id}
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def _pointGrid(self, sink, bbox, hSpacing, vSpacing, hOverlay, vOverlay, feedback):
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feat = QgsFeature()
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columns = int(math.ceil(float(bbox.width()) / (hSpacing - hOverlay)))
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rows = int(math.ceil(float(bbox.height()) / (vSpacing - vOverlay)))
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cells = rows * columns
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count_update = cells * 0.05
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id = 1
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count = 0
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for col in range(columns):
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for row in range(rows):
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x = bbox.xMinimum() + (col * hSpacing - col * hOverlay)
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y = bbox.yMaximum() - (row * vSpacing - row * vOverlay)
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feat.setGeometry(QgsGeometry.fromPointXY(QgsPointXY(x, y)))
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feat.setAttributes([x, y, x + hSpacing, y + vSpacing, id])
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sink.addFeature(feat, QgsFeatureSink.FastInsert)
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id += 1
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count += 1
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if int(math.fmod(count, count_update)) == 0:
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feedback.setProgress(int(count / cells * 100))
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def _lineGrid(self, sink, bbox, hSpacing, vSpacing, hOverlay, vOverlay, feedback):
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feat = QgsFeature()
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if hOverlay > 0:
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hSpace = [hSpacing - hOverlay, hOverlay]
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else:
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hSpace = [hSpacing, hSpacing]
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if vOverlay > 0:
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vSpace = [vSpacing - vOverlay, vOverlay]
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else:
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vSpace = [vSpacing, vSpacing]
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count = 0
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id = 1
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# latitude lines
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count_max = bbox.height() / vSpacing
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count_update = count_max * 0.10
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y = bbox.yMaximum()
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while y >= bbox.yMinimum():
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if feedback.isCanceled():
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break
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pt1 = QgsPoint(bbox.xMinimum(), y)
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pt2 = QgsPoint(bbox.xMaximum(), y)
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line = QgsLineString([pt1, pt2])
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feat.setGeometry(QgsGeometry(line))
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feat.setAttributes([bbox.xMinimum(),
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y,
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bbox.xMaximum(),
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y,
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id,
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y])
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sink.addFeature(feat, QgsFeatureSink.FastInsert)
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y = y - vSpace[count % 2]
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id += 1
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count += 1
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if int(math.fmod(count, count_update)) == 0:
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feedback.setProgress(int(count / count_max * 50))
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feedback.setProgress(50)
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# longitude lines
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# counters for progressbar - update every 5%
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count = 0
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count_max = bbox.width() / hSpacing
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count_update = count_max * 0.10
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x = bbox.xMinimum()
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while x <= bbox.xMaximum():
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if feedback.isCanceled():
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break
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pt1 = QgsPoint(x, bbox.yMaximum())
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pt2 = QgsPoint(x, bbox.yMinimum())
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line = QgsLineString([pt1, pt2])
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feat.setGeometry(QgsGeometry(line))
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feat.setAttributes([x,
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bbox.yMaximum(),
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x,
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bbox.yMinimum(),
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id,
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x])
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sink.addFeature(feat, QgsFeatureSink.FastInsert)
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x = x + hSpace[count % 2]
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id += 1
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count += 1
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if int(math.fmod(count, count_update)) == 0:
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feedback.setProgress(50 + int(count / count_max * 50))
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def _rectangleGrid(self, sink, bbox, hSpacing, vSpacing, hOverlay, vOverlay, feedback):
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feat = QgsFeature()
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columns = int(math.ceil(float(bbox.width()) / (hSpacing - hOverlay)))
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rows = int(math.ceil(float(bbox.height()) / (vSpacing - vOverlay)))
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cells = rows * columns
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count_update = cells * 0.05
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id = 1
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count = 0
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for col in range(columns):
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if feedback.isCanceled():
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break
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x1 = bbox.xMinimum() + (col * hSpacing - col * hOverlay)
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x2 = x1 + hSpacing
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for row in range(rows):
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y1 = bbox.yMaximum() - (row * vSpacing - row * vOverlay)
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y2 = y1 - vSpacing
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polyline = []
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polyline.append(QgsPointXY(x1, y1))
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polyline.append(QgsPointXY(x2, y1))
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polyline.append(QgsPointXY(x2, y2))
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polyline.append(QgsPointXY(x1, y2))
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polyline.append(QgsPointXY(x1, y1))
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feat.setGeometry(QgsGeometry.fromPolygonXY([polyline]))
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feat.setAttributes([x1, y1, x2, y2, id])
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sink.addFeature(feat, QgsFeatureSink.FastInsert)
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id += 1
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count += 1
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if int(math.fmod(count, count_update)) == 0:
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feedback.setProgress(int(count / cells * 100))
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def _diamondGrid(self, sink, bbox, hSpacing, vSpacing, hOverlay, vOverlay, feedback):
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feat = QgsFeature()
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halfHSpacing = hSpacing / 2
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halfVSpacing = vSpacing / 2
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halfHOverlay = hOverlay / 2
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halfVOverlay = vOverlay / 2
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columns = int(math.ceil(float(bbox.width()) / (halfHSpacing - halfHOverlay)))
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rows = int(math.ceil(float(bbox.height()) / (vSpacing - halfVOverlay)))
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cells = rows * columns
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count_update = cells * 0.05
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id = 1
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count = 0
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for col in range(columns):
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if feedback.isCanceled():
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break
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x = bbox.xMinimum() - (col * halfHOverlay)
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x1 = x + ((col + 0) * halfHSpacing)
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x2 = x + ((col + 1) * halfHSpacing)
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x3 = x + ((col + 2) * halfHSpacing)
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for row in range(rows):
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y = bbox.yMaximum() + (row * halfVOverlay)
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if (col % 2) == 0:
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y1 = y - (((row * 2) + 0) * halfVSpacing)
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y2 = y - (((row * 2) + 1) * halfVSpacing)
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y3 = y - (((row * 2) + 2) * halfVSpacing)
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else:
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y1 = y - (((row * 2) + 1) * halfVSpacing)
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y2 = y - (((row * 2) + 2) * halfVSpacing)
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y3 = y - (((row * 2) + 3) * halfVSpacing)
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polyline = []
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polyline.append(QgsPointXY(x1, y2))
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polyline.append(QgsPointXY(x2, y1))
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polyline.append(QgsPointXY(x3, y2))
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polyline.append(QgsPointXY(x2, y3))
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polyline.append(QgsPointXY(x1, y2))
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feat.setGeometry(QgsGeometry.fromPolygonXY([polyline]))
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feat.setAttributes([x1, y1, x3, y3, id])
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sink.addFeature(feat, QgsFeatureSink.FastInsert)
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id += 1
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count += 1
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if int(math.fmod(count, count_update)) == 0:
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feedback.setProgress(int(count / cells * 100))
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def _hexagonGrid(self, sink, bbox, hSpacing, vSpacing, hOverlay, vOverlay, feedback):
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feat = QgsFeature()
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# To preserve symmetry, hspacing is fixed relative to vspacing
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xVertexLo = 0.288675134594813 * vSpacing
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xVertexHi = 0.577350269189626 * vSpacing
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hSpacing = xVertexLo + xVertexHi
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hOverlay = hSpacing - hOverlay
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if hOverlay < 0:
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raise QgsProcessingException(
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self.tr('To preserve symmetry, hspacing is fixed relative to vspacing\n \
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hspacing is fixed at: {0} and hoverlay is fixed at: {1}\n \
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hoverlay cannot be negative. Increase hoverlay.').format(hSpacing, hOverlay)
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)
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halfVSpacing = vSpacing / 2.0
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columns = int(math.ceil(float(bbox.width()) / hOverlay))
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rows = int(math.ceil(float(bbox.height()) / (vSpacing - vOverlay)))
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cells = rows * columns
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count_update = cells * 0.05
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id = 1
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count = 0
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for col in range(columns):
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if feedback.isCanceled():
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break
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# (column + 1) and (row + 1) calculation is used to maintain
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# topology between adjacent shapes and avoid overlaps/holes
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# due to rounding errors
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x1 = bbox.xMinimum() + (col * hOverlay) # far left
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x2 = x1 + (xVertexHi - xVertexLo) # left
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x3 = bbox.xMinimum() + (col * hOverlay) + hSpacing # right
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x4 = x3 + (xVertexHi - xVertexLo) # far right
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for row in range(rows):
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if (col % 2) == 0:
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y1 = bbox.yMaximum() + (row * vOverlay) - (((row * 2) + 0) * halfVSpacing) # hi
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y2 = bbox.yMaximum() + (row * vOverlay) - (((row * 2) + 1) * halfVSpacing) # mid
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y3 = bbox.yMaximum() + (row * vOverlay) - (((row * 2) + 2) * halfVSpacing) # lo
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else:
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y1 = bbox.yMaximum() + (row * vOverlay) - (((row * 2) + 1) * halfVSpacing) # hi
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y2 = bbox.yMaximum() + (row * vOverlay) - (((row * 2) + 2) * halfVSpacing) # mid
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y3 = bbox.yMaximum() + (row * vOverlay) - (((row * 2) + 3) * halfVSpacing) # lo
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polyline = []
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polyline.append(QgsPointXY(x1, y2))
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polyline.append(QgsPointXY(x2, y1))
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polyline.append(QgsPointXY(x3, y1))
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polyline.append(QgsPointXY(x4, y2))
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polyline.append(QgsPointXY(x3, y3))
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polyline.append(QgsPointXY(x2, y3))
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polyline.append(QgsPointXY(x1, y2))
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feat.setGeometry(QgsGeometry.fromPolygonXY([polyline]))
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feat.setAttributes([x1, y1, x4, y3, id])
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sink.addFeature(feat, QgsFeatureSink.FastInsert)
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id += 1
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count += 1
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if int(math.fmod(count, count_update)) == 0:
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feedback.setProgress(int(count / cells * 100))
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