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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 random import *
from math import *
from ui_frmRegPoints import Ui_Dialog
class Dialog(QDialog, Ui_Dialog):
def __init__(self, iface):
QDialog.__init__(self, iface.mainWindow())
self.iface = iface
self.setupUi(self)
self.xMin.setValidator(QDoubleValidator(self.xMin))
self.xMax.setValidator(QDoubleValidator(self.xMax))
self.yMin.setValidator(QDoubleValidator(self.yMin))
self.yMax.setValidator(QDoubleValidator(self.yMax))
QObject.connect(self.toolOut, SIGNAL("clicked()"), self.outFile)
self.setWindowTitle( self.tr("Regular points") )
self.buttonOk = self.buttonBox_2.button( QDialogButtonBox.Ok )
self.progressBar.setValue(0)
self.mapCanvas = self.iface.mapCanvas()
self.populateLayers()
def populateLayers( self ):
layers = ftools_utils.getLayerNames("all")
self.inShape.clear()
self.inShape.addItems(layers)
def accept(self):
self.buttonOk.setEnabled( False )
if not self.rdoCoordinates.isChecked() and self.inShape.currentText() == "":
QMessageBox.information(self, self.tr("Generate Regular Points"), self.tr("Please specify input layer"))
elif self.rdoCoordinates.isChecked() and (self.xMin.text() == "" or self.xMax.text() == "" or self.yMin.text() == "" or self.yMax.text() == ""):
QMessageBox.information(self, self.tr("Generate Regular Points"), self.tr("Please properly specify extent coordinates"))
elif self.outShape.text() == "":
QMessageBox.information(self, self.tr("Generate Regular Points"), self.tr("Please specify output shapefile"))
else:
inName = self.inShape.currentText()
outPath = self.outShape.text()
self.outShape.clear()
outName = ftools_utils.getShapefileName( outPath )
if self.rdoSpacing.isChecked(): value = self.spnSpacing.value()
else: value = self.spnNumber.value()
if self.chkRandom.isChecked(): offset = True
else: offset = False
if self.rdoBoundary.isChecked():
mLayer = ftools_utils.getMapLayerByName(unicode(inName))
boundBox = mLayer.extent()
crs = mLayer.crs()
else:
boundBox = QgsRectangle(float(self.xMin.text()), float(self.yMin.text()), float(self.xMax.text()), float(self.yMax.text()))
crs = self.mapCanvas.mapRenderer().destinationCrs()
print crs.isValid()
if not crs.isValid(): crs = None
self.regularize(boundBox, outPath, offset, value, self.rdoSpacing.isChecked(), self.spnInset.value(), crs)
if self.addToCanvasCheck.isChecked():
addCanvasCheck = ftools_utils.addShapeToCanvas(unicode(outPath))
if not addCanvasCheck:
QMessageBox.warning( self, self.tr("Generate Regular Points"), self.tr( "Error loading output shapefile:\n%s" ) % ( unicode( outPath ) ))
self.populateLayers()
else:
QMessageBox.information(self, self.tr("Generate Regular Points"),self.tr("Created output shapefile:\n%s" ) % ( unicode( outPath )))
self.progressBar.setValue(0)
self.buttonOk.setEnabled( True )
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 )
# Generate list of random points
def simpleRandom(self, n, bound, xmin, xmax, ymin, ymax):
seed()
points = []
i = 1
while i <= n:
pGeom = QgsGeometry().fromPoint(QgsPoint(xmin + (xmax-xmin) * random(), ymin + (ymax-ymin) * random()))
if pGeom.intersects(bound):
points.append(pGeom)
i = i + 1
return points
def regularize(self, bound, outPath, offset, value, gridType, inset, crs):
area = bound.width() * bound.height()
if offset:
seed()
if gridType:
pointSpacing = value
else:
# Calculate grid spacing
pointSpacing = sqrt(area / value)
outFeat = QgsFeature()
outFeat.initAttributes(1)
fields = QgsFields()
fields.append( QgsField("ID", QVariant.Int) )
outFeat.setFields( fields )
check = QFile(self.shapefileName)
if check.exists():
if not QgsVectorFileWriter.deleteShapeFile(self.shapefileName):
return
writer = QgsVectorFileWriter(self.shapefileName, self.encoding, fields, QGis.WKBPoint, crs)
idVar = 0
count = 10.00
add = 90.00 / (area / pointSpacing)
y = bound.yMaximum() - inset
while y >= bound.yMinimum():
x = bound.xMinimum() + inset
while x <= bound.xMaximum():
if offset:
pGeom = QgsGeometry().fromPoint(QgsPoint(uniform(x - (pointSpacing / 2.0), x + (pointSpacing / 2.0)),
uniform(y - (pointSpacing / 2.0), y + (pointSpacing / 2.0))))
else:
pGeom = QgsGeometry().fromPoint(QgsPoint(x, y))
if pGeom.intersects(bound):
outFeat.setGeometry(pGeom)
outFeat.setAttribute(0, idVar)
writer.addFeature(outFeat)
idVar = idVar + 1
x = x + pointSpacing
count = count + add
self.progressBar.setValue(count)
y = y - pointSpacing
del writer
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