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