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268 lines
11 KiB
Python
268 lines
11 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 math
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from PyQt4.QtCore import QVariant
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from qgis.core import QgsRectangle, QgsCoordinateReferenceSystem, QGis, QgsField, QgsFeature, QgsGeometry, QgsPoint
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.GeoAlgorithmExecutionException import GeoAlgorithmExecutionException
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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 ParameterSelection
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from processing.core.parameters import ParameterCrs
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from processing.core.outputs import OutputVector
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class Grid(GeoAlgorithm):
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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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CRS = 'CRS'
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OUTPUT = 'OUTPUT'
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def defineCharacteristics(self):
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self.name, self.i18n_name = self.trAlgorithm('Create grid')
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self.group, self.i18n_group = self.trAlgorithm('Vector creation tools')
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self.types = [self.tr('Rectangle (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(ParameterSelection(self.TYPE,
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self.tr('Grid type'), self.types))
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self.addParameter(ParameterExtent(self.EXTENT,
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self.tr('Grid extent')))
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self.addParameter(ParameterNumber(self.HSPACING,
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self.tr('Horizontal spacing'), default=10.0))
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self.addParameter(ParameterNumber(self.VSPACING,
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self.tr('Vertical spacing'), default=10.0))
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self.addParameter(ParameterCrs(self.CRS, 'Grid CRS'))
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self.addOutput(OutputVector(self.OUTPUT, self.tr('Grid')))
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def processAlgorithm(self, progress):
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idx = self.getParameterValue(self.TYPE)
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extent = self.getParameterValue(self.EXTENT).split(',')
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hSpacing = self.getParameterValue(self.HSPACING)
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vSpacing = self.getParameterValue(self.VSPACING)
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crs = QgsCoordinateReferenceSystem(self.getParameterValue(self.CRS))
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bbox = QgsRectangle(float(extent[0]), float(extent[2]),
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float(extent[1]), float(extent[3]))
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width = bbox.width()
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height = bbox.height()
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centerX = bbox.center().x()
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centerY = bbox.center().y()
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originX = centerX - width / 2.0
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originY = centerY - height / 2.0
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if hSpacing <= 0 or vSpacing <= 0:
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raise GeoAlgorithmExecutionException(
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self.tr('Invalid grid spacing: %s/%s' % (hSpacing, vSpacing)))
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if width < hSpacing:
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raise GeoAlgorithmExecutionException(
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self.tr('Horizontal spacing is too small for the covered area'))
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if height < vSpacing:
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raise GeoAlgorithmExecutionException(
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self.tr('Vertical spacing is too small for the covered area'))
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if self.types[idx].find('polygon') >= 0:
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geometryType = QGis.WKBPolygon
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else:
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geometryType = QGis.WKBLineString
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fields = [QgsField('left', QVariant.Double, '', 24, 16),
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QgsField('top', QVariant.Double, '', 24, 16),
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QgsField('right', QVariant.Double, '', 24, 16),
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QgsField('bottom', QVariant.Double, '', 24, 16)
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]
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writer = self.getOutputFromName(self.OUTPUT).getVectorWriter(fields,
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geometryType, crs)
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if idx == 0:
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self._rectangleGridLine(
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writer, width, height, originX, originY, hSpacing, vSpacing)
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elif idx == 1:
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self._rectangleGridPoly(
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writer, width, height, originX, originY, hSpacing, vSpacing)
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elif idx == 2:
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self._diamondGrid(
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writer, width, height, originX, originY, hSpacing, vSpacing)
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elif idx == 3:
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self._hexagonGrid(
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writer, width, height, originX, originY, hSpacing, vSpacing)
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del writer
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def _rectangleGridLine(self, writer, width, height, originX, originY,
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hSpacing, vSpacing):
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ft = QgsFeature()
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columns = int(math.floor(float(width) / hSpacing))
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rows = int(math.floor(float(height) / vSpacing))
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# Longitude lines
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for col in xrange(0, columns + 1):
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polyline = []
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x = originX + (col * hSpacing)
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for row in xrange(0, rows + 1):
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y = originY + (row * vSpacing)
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polyline.append(QgsPoint(x, y))
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ft.setGeometry(QgsGeometry.fromPolyline(polyline))
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ft.setAttributes([x, originY, x, originY + (rows * vSpacing)])
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writer.addFeature(ft)
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# Latitude lines
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for row in xrange(0, rows + 1):
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polyline = []
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y = originY + (row * vSpacing)
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for col in xrange(0, columns + 1):
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x = originX + (col * hSpacing)
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polyline.append(QgsPoint(x, y))
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ft.setGeometry(QgsGeometry.fromPolyline(polyline))
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ft.setAttributes([originX, y, originX + (col * hSpacing), y])
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writer.addFeature(ft)
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def _rectangleGridPoly(self, writer, width, height, originX, originY,
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hSpacing, vSpacing):
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ft = QgsFeature()
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columns = int(math.floor(float(width) / hSpacing))
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rows = int(math.floor(float(height) / vSpacing))
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for col in xrange(0, columns):
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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 = originX + (col * hSpacing)
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x2 = originX + ((col + 1) * hSpacing)
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for row in xrange(0, rows):
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y1 = originY + (row * vSpacing)
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y2 = originY + ((row + 1) * vSpacing)
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polyline = []
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polyline.append(QgsPoint(x1, y1))
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polyline.append(QgsPoint(x2, y1))
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polyline.append(QgsPoint(x2, y2))
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polyline.append(QgsPoint(x1, y2))
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polyline.append(QgsPoint(x1, y1))
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ft.setGeometry(QgsGeometry.fromPolygon([polyline]))
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ft.setAttributes([x1, y1, x2, y2])
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writer.addFeature(ft)
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def _diamondGrid(self, writer, width, height, originX, originY,
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hSpacing, vSpacing):
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ft = QgsFeature()
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halfHSpacing = hSpacing / 2
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halfVSpacing = vSpacing / 2
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columns = int(math.floor(float(width) / halfHSpacing))
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rows = int(math.floor(float(height) / vSpacing))
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for col in xrange(0, columns):
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x1 = originX + ((col + 0) * halfHSpacing)
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x2 = originX + ((col + 1) * halfHSpacing)
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x3 = originX + ((col + 2) * halfHSpacing)
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for row in xrange(0, rows):
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if (col % 2) == 0:
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y1 = originY + (((row * 2) + 0) * halfVSpacing)
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y2 = originY + (((row * 2) + 1) * halfVSpacing)
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y3 = originY + (((row * 2) + 2) * halfVSpacing)
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else:
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y1 = originY + (((row * 2) + 1) * halfVSpacing)
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y2 = originY + (((row * 2) + 2) * halfVSpacing)
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y3 = originY + (((row * 2) + 3) * halfVSpacing)
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polyline = []
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polyline.append(QgsPoint(x1, y2))
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polyline.append(QgsPoint(x2, y1))
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polyline.append(QgsPoint(x3, y2))
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polyline.append(QgsPoint(x2, y3))
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polyline.append(QgsPoint(x1, y2))
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ft.setGeometry(QgsGeometry.fromPolygon([polyline]))
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ft.setAttributes([x1, y1, x3, y3])
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writer.addFeature(ft)
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def _hexagonGrid(self, writer, width, height, originX, originY,
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hSpacing, vSpacing):
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ft = 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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halfVSpacing = vSpacing / 2
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columns = int(math.floor(float(width) / hSpacing))
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rows = int(math.floor(float(height) / vSpacing))
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for col in xrange(0, columns):
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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 = originX + (col * hSpacing) # far left
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x2 = x1 + (xVertexHi - xVertexLo) # left
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x3 = originX + ((col + 1) * hSpacing) # right
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x4 = x3 + (xVertexHi - xVertexLo) # far right
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for row in xrange(0, rows):
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if (col % 2) == 0:
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y1 = originY + (((row * 2) + 0) * halfVSpacing) # hi
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y2 = originY + (((row * 2) + 1) * halfVSpacing) # mid
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y3 = originY + (((row * 2) + 2) * halfVSpacing) # lo
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else:
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y1 = originY + (((row * 2) + 1) * halfVSpacing) # hi
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y2 = originY + (((row * 2) + 2) * halfVSpacing) # mid
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y3 = originY + (((row * 2) + 3) * halfVSpacing) # lo
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polyline = []
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polyline.append(QgsPoint(x1, y2))
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polyline.append(QgsPoint(x2, y1))
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polyline.append(QgsPoint(x3, y1))
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polyline.append(QgsPoint(x4, y2))
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polyline.append(QgsPoint(x3, y3))
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polyline.append(QgsPoint(x2, y3))
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polyline.append(QgsPoint(x1, y2))
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ft.setGeometry(QgsGeometry.fromPolygon([polyline]))
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ft.setAttributes([x1, y1, x4, y3])
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writer.addFeature(ft)
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