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239 lines
8.4 KiB
Python
239 lines
8.4 KiB
Python
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# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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DeleteColumn.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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from PyQt4.QtCore import *
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from qgis.core import *
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from processing.core.GeoAlgorithm import GeoAlgorithm
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from processing.core.GeoAlgorithmExecutionException import \
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GeoAlgorithmExecutionException
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from processing.core.parameters import ParameterNumber
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from processing.core.parameters import ParameterCrs
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from processing.core.parameters import ParameterSelection
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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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WIDTH = 'WIDTH'
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HEIGHT = 'HEIGHT'
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HSPACING = 'HSPACING'
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VSPACING = 'VSPACING'
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CENTERX = 'CENTERX'
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CENTERY = 'CENTERY'
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CRS = 'CRS'
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OUTPUT = 'OUTPUT'
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TYPES = ['Rectangle (line)',
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'Rectangle (polygon)',
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'Diamond (polygon)',
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'Hexagon (polygon)'
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]
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def defineCharacteristics(self):
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self.name = 'Create grid'
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self.group = 'Vector creation tools'
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self.addParameter(ParameterSelection(
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self.TYPE, 'Grid type', self.TYPES))
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self.addParameter(ParameterNumber(
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self.WIDTH, 'Width', default=360.0))
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self.addParameter(ParameterNumber(
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self.HEIGHT, 'Height', default=180.0))
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self.addParameter(ParameterNumber(
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self.HSPACING, 'Horizontal spacing', default=10.0))
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self.addParameter(ParameterNumber(
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self.VSPACING, 'Vertical spacing', default=10.0))
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self.addParameter(ParameterNumber(
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self.CENTERX, 'Center X', default=0.0))
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self.addParameter(ParameterNumber(
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self.CENTERY, 'Center Y', default=0.0))
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self.addParameter(ParameterCrs(self.CRS, 'Output CRS'))
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self.addOutput(OutputVector(self.OUTPUT, 'Output'))
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def processAlgorithm(self, progress):
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idx = self.getParameterValue(self.TYPE)
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width = self.getParameterValue(self.WIDTH)
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height = self.getParameterValue(self.HEIGHT)
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hSpacing = self.getParameterValue(self.HSPACING)
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vSpacing = self.getParameterValue(self.VSPACING)
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centerX = self.getParameterValue(self.CENTERX)
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centerY = self.getParameterValue(self.CENTERY)
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originX = centerX - width / 2.0
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originY = centerY - height / 2.0
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crs = QgsCoordinateReferenceSystem(self.getParameterValue(self.CRS))
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if hSpacing <= 0 or vSpacing <= 0:
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raise GeoAlgorithmExecutionException(
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'Invalid grid spacing: %s/%s' % (hSpacing, vSpacing))
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if width < hSpacing:
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raise GeoAlgorithmExecutionException(
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'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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'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('lon', QVariant.Double, '', 24, 16),
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QgsField('lat', 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, hSpacing, vSpacing):
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ft = QgsFeature()
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x = originX
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while x <= originX + width:
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polyline = []
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y = originY
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while y <= originY + height:
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polyline.append(QgsPoint(x, y))
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y += vSpacing
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ft.setGeometry(QgsGeometry.fromPolyline(polyline))
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ft.setAttributes([x, 0])
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writer.addFeature(ft)
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x += hSpacing
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y = originY
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while y <= originY + height:
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polyline = []
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x = originX
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while x <= originX + width:
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polyline.append(QgsPoint(x, y))
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x += hSpacing
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ft.setGeometry(QgsGeometry.fromPolyline(polyline))
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ft.setAttributes([0, y])
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writer.addFeature(ft)
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y += hSpacing
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def _rectangleGridPoly(self, writer, width, height, originX, originY, hSpacing, vSpacing):
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ft = QgsFeature()
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x = originX
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while x < originX + width:
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y = originY
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while y < originY + height:
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polyline = []
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polyline.append(QgsPoint(x, y))
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polyline.append(QgsPoint(x + hSpacing, y))
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polyline.append(QgsPoint(x + hSpacing, y + vSpacing))
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polyline.append(QgsPoint(x, y + vSpacing))
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ft.setGeometry(QgsGeometry.fromPolygon([polyline]))
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ft.setAttributes([x + hSpacing / 2.0, y + vSpacing / 2.0])
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writer.addFeature(ft)
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y += vSpacing
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x += hSpacing
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def _diamondGrid(self, writer, width, height, originX, originY, hSpacing, vSpacing):
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ft = QgsFeature()
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x = originX
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colNum = 0
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while x < originX + width:
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if colNum % 2 == 0:
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y = originY
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else:
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y = originY + vSpacing / 2.0
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while y < originY + height:
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polyline = []
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polyline.append(QgsPoint(x + hSpacing / 2.0, y))
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polyline.append(QgsPoint(x + hSpacing, y + vSpacing / 2.0))
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polyline.append(QgsPoint(x + hSpacing / 2.0, y + vSpacing))
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polyline.append(QgsPoint(x, y + vSpacing / 2.0))
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ft.setGeometry(QgsGeometry.fromPolygon([polyline]))
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ft.setAttributes([x + hSpacing / 2.0, y + vSpacing / 2.0])
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writer.addFeature(ft)
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y += vSpacing
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x += hSpacing / 2.0
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colNum += 1
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def _hexagonGrid(self, writer, width, height, originX, originY, hSpacing, vSpacing):
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ft = QgsFeature()
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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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x = originX + xVertexHi
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colNum = 0
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while x < originX + width:
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if colNum % 2 == 0:
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y = originY + vSpacing / 2.0
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else:
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y = originY + vSpacing
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while y < originY + height:
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polyline = []
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polyline.append(QgsPoint(x + xVertexHi, y))
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polyline.append(QgsPoint(x + xVertexLo, y + vSpacing / 2.0))
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polyline.append(QgsPoint(x - xVertexLo, y + vSpacing / 2.0))
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polyline.append(QgsPoint(x - xVertexHi, y))
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polyline.append(QgsPoint(x - xVertexLo, y - vSpacing / 2.0))
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polyline.append(QgsPoint(x + xVertexLo, y - vSpacing / 2.0))
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ft.setGeometry(QgsGeometry.fromPolygon([polyline]))
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ft.setAttributes([x, y])
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writer.addFeature(ft)
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y += vSpacing
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x += hSpacing
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colNum += 1
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