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300 lines
14 KiB
Python
300 lines
14 KiB
Python
# -*- coding: utf-8 -*-
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#-----------------------------------------------------------
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#
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# fTools
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# Copyright (C) 2008-2011 Carson Farmer
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# EMAIL: carson.farmer (at) gmail.com
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# WEB : http://www.ftools.ca/fTools.html
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#
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# A collection of data management and analysis tools for vector data
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#
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#-----------------------------------------------------------
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#
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# licensed under the terms of GNU GPL 2
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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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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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#---------------------------------------------------------------------
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from PyQt4.QtCore import *
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from PyQt4.QtGui import *
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import ftools_utils
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from qgis.core import *
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from ui_frmVectorGrid import Ui_Dialog
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import math
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class Dialog(QDialog, Ui_Dialog):
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def __init__(self, iface):
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QDialog.__init__(self, iface.mainWindow())
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self.iface = iface
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self.setupUi(self)
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QObject.connect(self.toolOut, SIGNAL("clicked()"), self.outFile)
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QObject.connect(self.spnX, SIGNAL("valueChanged(double)"), self.offset)
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#QObject.connect(self.inShape, SIGNAL("currentIndexChanged(QString)"), self.updateInput)
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QObject.connect(self.btnUpdate, SIGNAL("clicked()"), self.updateLayer)
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QObject.connect(self.btnCanvas, SIGNAL("clicked()"), self.updateCanvas)
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QObject.connect(self.chkAlign, SIGNAL("toggled(bool)"), self.chkAlignToggled)
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self.buttonOk = self.buttonBox_2.button( QDialogButtonBox.Ok )
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self.setWindowTitle(self.tr("Vector grid"))
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self.xMin.setValidator(QDoubleValidator(self.xMin))
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self.xMax.setValidator(QDoubleValidator(self.xMax))
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self.yMin.setValidator(QDoubleValidator(self.yMin))
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self.yMax.setValidator(QDoubleValidator(self.yMax))
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self.populateLayers()
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def populateLayers( self ):
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self.inShape.clear()
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layermap = QgsMapLayerRegistry.instance().mapLayers()
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for name, layer in layermap.iteritems():
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self.inShape.addItem( unicode( layer.name() ) )
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if layer == self.iface.activeLayer():
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self.inShape.setCurrentIndex( self.inShape.count() -1 )
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def offset(self, value):
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if self.chkLock.isChecked():
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self.spnY.setValue(value)
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def updateLayer( self ):
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mLayerName = self.inShape.currentText()
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if not mLayerName == "":
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mLayer = ftools_utils.getMapLayerByName( unicode( mLayerName ) )
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# get layer extents
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boundBox = mLayer.extent()
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# if "align extents and resolution..." button is checked
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if self.chkAlign.isChecked():
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if not mLayer.type() == QgsMapLayer.RasterLayer:
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QMessageBox.information(self, self.tr("Vector grid"), self.tr("Please select a raster layer"))
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else:
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dx = math.fabs(boundBox.xMaximum()-boundBox.xMinimum()) / mLayer.width()
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dy = math.fabs(boundBox.yMaximum()-boundBox.yMinimum()) / mLayer.height()
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self.spnX.setValue(dx)
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self.spnY.setValue(dy)
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self.updateExtents( boundBox )
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def updateCanvas( self ):
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canvas = self.iface.mapCanvas()
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boundBox = canvas.extent()
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# if "align extents and resolution..." button is checked
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if self.chkAlign.isChecked():
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mLayerName = self.inShape.currentText()
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if not mLayerName == "":
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mLayer = ftools_utils.getMapLayerByName( unicode( mLayerName ) )
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if not mLayer.type() == QgsMapLayer.RasterLayer:
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QMessageBox.information(self, self.tr("Vector grid"), self.tr("Please select a raster layer"))
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else:
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# get extents and pixel size
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xMin = boundBox.xMinimum()
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yMin = boundBox.yMinimum()
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xMax = boundBox.xMaximum()
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yMax = boundBox.yMaximum()
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boundBox2 = mLayer.extent()
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dx = math.fabs(boundBox2.xMaximum()-boundBox2.xMinimum()) / mLayer.width()
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dy = math.fabs(boundBox2.yMaximum()-boundBox2.yMinimum()) / mLayer.height()
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# get pixels from the raster that are closest to the desired extent
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newXMin = self.getClosestPixel( boundBox2.xMinimum(), boundBox.xMinimum(), dx, True )
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newXMax = self.getClosestPixel( boundBox2.xMaximum(), boundBox.xMaximum(), dx, False )
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newYMin = self.getClosestPixel( boundBox2.yMinimum(), boundBox.yMinimum(), dy, True )
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newYMax = self.getClosestPixel( boundBox2.yMaximum(), boundBox.yMaximum(), dy, False )
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# apply new values if found all min/max
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if newXMin is not None and newXMax is not None and newYMin is not None and newYMax is not None:
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boundBox.set( newXMin, newYMin, newXMax, newYMax )
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self.spnX.setValue(dx)
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self.spnY.setValue(dy)
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else:
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QMessageBox.information(self, self.tr("Vector grid"), self.tr("Unable to compute extents aligned on selected raster layer"))
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self.updateExtents( boundBox )
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def updateExtents( self, boundBox ):
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self.xMin.setText( unicode( boundBox.xMinimum() ) )
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self.yMin.setText( unicode( boundBox.yMinimum() ) )
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self.xMax.setText( unicode( boundBox.xMaximum() ) )
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self.yMax.setText( unicode( boundBox.yMaximum() ) )
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def accept(self):
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self.buttonOk.setEnabled( False )
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if self.xMin.text() == "" or self.xMax.text() == "" or self.yMin.text() == "" or self.yMax.text() == "":
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QMessageBox.information(self, self.tr("Vector grid"), self.tr("Please specify valid extent coordinates"))
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elif self.outShape.text() == "":
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QMessageBox.information(self, self.tr("Vector grid"), self.tr("Please specify output shapefile"))
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else:
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try:
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boundBox = QgsRectangle(
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float( self.xMin.text() ),
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float( self.yMin.text() ),
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float( self.xMax.text() ),
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float( self.yMax.text() ) )
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except:
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QMessageBox.information(self, self.tr("Vector grid"), self.tr("Invalid extent coordinates entered"))
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xSpace = self.spnX.value()
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ySpace = self.spnY.value()
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if self.rdoPolygons.isChecked():
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polygon = True
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else:
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polygon = False
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self.outShape.clear()
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QApplication.setOverrideCursor(Qt.WaitCursor)
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self.compute( boundBox, xSpace, ySpace, polygon )
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QApplication.restoreOverrideCursor()
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addToTOC = QMessageBox.question(self, self.tr("Generate Vector Grid"), self.tr("Created output shapefile:\n%1\n\nWould you like to add the new layer to the TOC?").arg(unicode(self.shapefileName)), QMessageBox.Yes, QMessageBox.No, QMessageBox.NoButton)
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if addToTOC == QMessageBox.Yes:
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ftools_utils.addShapeToCanvas( self.shapefileName )
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self.populateLayers()
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self.progressBar.setValue( 0 )
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self.buttonOk.setEnabled( True )
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def compute( self, bound, xOffset, yOffset, polygon ):
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crs = None
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layer = ftools_utils.getMapLayerByName(unicode(self.inShape.currentText()))
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if layer is None:
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crs = self.iface.mapCanvas().mapRenderer().destinationCrs()
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else:
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crs = layer.crs()
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if not crs.isValid(): crs = None
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if polygon:
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fields = {0:QgsField("ID", QVariant.Int), 1:QgsField("XMIN", QVariant.Double), 2:QgsField("XMAX", QVariant.Double),
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3:QgsField("YMIN", QVariant.Double), 4:QgsField("YMAX", QVariant.Double)}
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check = QFile(self.shapefileName)
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if check.exists():
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if not QgsVectorFileWriter.deleteShapeFile(self.shapefileName):
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return
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writer = QgsVectorFileWriter(self.shapefileName, self.encoding, fields, QGis.WKBPolygon, crs)
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else:
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fields = {0:QgsField("ID", QVariant.Int), 1:QgsField("COORD", QVariant.Double)}
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check = QFile(self.shapefileName)
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if check.exists():
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if not QgsVectorFileWriter.deleteShapeFile(self.shapefileName):
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return
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writer = QgsVectorFileWriter(self.shapefileName, self.encoding, fields, QGis.WKBLineString, crs)
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outFeat = QgsFeature()
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outGeom = QgsGeometry()
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idVar = 0
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self.progressBar.setValue( 0 )
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if not polygon:
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# counters for progressbar - update every 5%
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count = 0
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count_max = (bound.yMaximum() - bound.yMinimum()) / yOffset
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count_update = count_max * 0.10
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y = bound.yMaximum()
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while y >= bound.yMinimum():
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pt1 = QgsPoint(bound.xMinimum(), y)
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pt2 = QgsPoint(bound.xMaximum(), y)
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line = [pt1, pt2]
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outFeat.setGeometry(outGeom.fromPolyline(line))
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outFeat.addAttribute(0, QVariant(idVar))
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outFeat.addAttribute(1, QVariant(y))
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writer.addFeature(outFeat)
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y = y - yOffset
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idVar = idVar + 1
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count += 1
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if int( math.fmod( count, count_update ) ) == 0:
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prog = int( count / count_max * 50 )
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self.progressBar.setValue( prog )
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self.progressBar.setValue( 50 )
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# counters for progressbar - update every 5%
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count = 0
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count_max = (bound.xMaximum() - bound.xMinimum()) / xOffset
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count_update = count_max * 0.10
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x = bound.xMinimum()
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while x <= bound.xMaximum():
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pt1 = QgsPoint(x, bound.yMaximum())
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pt2 = QgsPoint(x, bound.yMinimum())
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line = [pt1, pt2]
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outFeat.setGeometry(outGeom.fromPolyline(line))
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outFeat.addAttribute(0, QVariant(idVar))
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outFeat.addAttribute(1, QVariant(x))
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writer.addFeature(outFeat)
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x = x + xOffset
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idVar = idVar + 1
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count += 1
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if int( math.fmod( count, count_update ) ) == 0:
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prog = 50 + int( count / count_max * 50 )
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self.progressBar.setValue( prog )
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else:
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# counters for progressbar - update every 5%
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count = 0
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count_max = (bound.yMaximum() - bound.yMinimum()) / yOffset
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count_update = count_max * 0.05
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y = bound.yMaximum()
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while y >= bound.yMinimum():
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x = bound.xMinimum()
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while x <= bound.xMaximum():
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pt1 = QgsPoint(x, y)
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pt2 = QgsPoint(x + xOffset, y)
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pt3 = QgsPoint(x + xOffset, y - yOffset)
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pt4 = QgsPoint(x, y - yOffset)
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pt5 = QgsPoint(x, y)
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polygon = [[pt1, pt2, pt3, pt4, pt5]]
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outFeat.setGeometry(outGeom.fromPolygon(polygon))
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outFeat.addAttribute(0, QVariant(idVar))
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outFeat.addAttribute(1, QVariant(x))
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outFeat.addAttribute(2, QVariant(x + xOffset))
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outFeat.addAttribute(3, QVariant(y - yOffset))
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outFeat.addAttribute(4, QVariant(y))
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writer.addFeature(outFeat)
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idVar = idVar + 1
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x = x + xOffset
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y = y - yOffset
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count += 1
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if int( math.fmod( count, count_update ) ) == 0:
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prog = int( count / count_max * 100 )
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self.progressBar.setValue( 100 )
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#self.progressBar.setRange( 0, 100 )
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del writer
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def outFile(self):
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self.outShape.clear()
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( self.shapefileName, self.encoding ) = ftools_utils.saveDialog( self )
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if self.shapefileName is None or self.encoding is None:
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return
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self.outShape.setText( QString( self.shapefileName ) )
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def chkAlignToggled(self):
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if self.chkAlign.isChecked():
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self.spnX.setEnabled( False )
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self.lblX.setEnabled( False )
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self.spnY.setEnabled( False )
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self.lblY.setEnabled( False )
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else:
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self.spnX.setEnabled( True )
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self.lblX.setEnabled( True )
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self.spnY.setEnabled( not self.chkLock.isChecked() )
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self.lblY.setEnabled( not self.chkLock.isChecked() )
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def getClosestPixel(self, startVal, targetVal, step, isMin ):
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foundVal = None
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tmpVal = startVal
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# find pixels covering the extent - slighlyt inneficient b/c loop on all elements before xMin
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if targetVal < startVal:
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backOneStep = not isMin
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step = - step
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while foundVal is None:
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if tmpVal <= targetVal:
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if backOneStep:
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tmpVal -= step
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foundVal = tmpVal
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tmpVal += step
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else:
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backOneStep = isMin
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while foundVal is None:
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if tmpVal >= targetVal:
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if backOneStep:
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tmpVal -= step
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foundVal = tmpVal
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tmpVal += step
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return foundVal
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