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172 lines
6.4 KiB
Python
172 lines
6.4 KiB
Python
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#-----------------------------------------------------------
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#
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# Generate Regular Points
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#
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# A QGIS plugin for generating a simple points
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# shapefile of regularly spaced points.
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#
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# Copyright (C) 2008 Carson Farmer
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#
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# EMAIL: carson.farmer (at) gmail.com
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# WEB : www.geog.uvic.ca/spar/carson
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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 random import *
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from math import *
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from frmRegPoints import Ui_Dialog
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class Dialog(QDialog, Ui_Dialog):
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def __init__(self, iface):
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QDialog.__init__(self)
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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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self.setWindowTitle("Regular points")
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self.progressBar.setValue(0)
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mapCanvas = self.iface.mapCanvas()
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for i in range(mapCanvas.layerCount()):
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layer = mapCanvas.layer(i)
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self.inShape.addItem(layer.name())
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def accept(self):
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if not self.rdoCoordinates.isChecked() and self.inShape.currentText() == "":
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QMessageBox.information(self, "Generate Regular Points", "Please specify input layer")
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elif self.rdoCoordinates.isChecked() and (self.xMin.text() == "" or self.xMax.text() == "" or self.yMin.text() == "" or self.yMax.text() == ""):
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QMessageBox.information(self, "Generate Regular Points", "Please properly specify extent coordinates")
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elif self.outShape.text() == "":
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QMessageBox.information(self, "Generate Regular Points", "Please specify output shapefile")
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else:
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inName = self.inShape.currentText()
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outPath = self.outShape.text()
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self.outShape.clear()
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if outPath.contains("\\"):
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outName = outPath.right((outPath.length() - outPath.lastIndexOf("\\")) - 1)
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else:
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outName = outPath.right((outPath.length() - outPath.lastIndexOf("/")) - 1)
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if outName.endsWith(".shp"):
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outName = outName.left(outName.length() - 4)
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if self.rdoSpacing.isChecked(): value = self.spnSpacing.value()
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else: value = self.spnNumber.value()
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if self.chkRandom.isChecked(): offset = True
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else: offset = False
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if self.rdoBoundary.isChecked():
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mLayer = self.getMapLayerByName(unicode(inName))
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boundBox = mLayer.extent()
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else:
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boundBox = QgsRect(float(self.xMin.text()), float(self.yMin.text()), float(self.xMax.text()), float(self.yMax.text()))
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self.regularize(boundBox, outPath, offset, value, self.rdoSpacing.isChecked(), self.spnInset.value(), self.progressBar)
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addToTOC = QMessageBox.question(self, "Generate Regular Points", "Created output point Shapefile:\n" + outPath
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+ "\nNote: Layer has no associated coordinate system, please use the Projection Management Tool to specify spatial reference system."
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+ "\n\nWould you like to add the new layer to the TOC?", QMessageBox.Yes, QMessageBox.No, QMessageBox.NoButton)
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if addToTOC == QMessageBox.Yes:
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self.vlayer = QgsVectorLayer(outPath, unicode(outName), "ogr")
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QgsMapLayerRegistry.instance().addMapLayer(self.vlayer)
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self.progressBar.setValue(0)
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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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# Generate list of random points
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def simpleRandom(self, n, bound, xmin, xmax, ymin, ymax):
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seed()
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points = []
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i = 1
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while i <= n:
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pGeom = QgsGeometry().fromPoint(QgsPoint(xmin + (xmax-xmin) * random(), ymin + (ymax-ymin) * random()))
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if pGeom.intersects(bound):
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points.append(pGeom)
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i = i + 1
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return points
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# Get vector layer by name from TOC
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def getVectorLayerByName(self, myName):
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mc = self.iface.mapCanvas()
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nLayers = mc.layerCount()
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for l in range(nLayers):
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layer = mc.layer(l)
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if layer.name() == unicode(myName):
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vlayer = QgsVectorLayer(unicode(layer.source()), unicode(myName), unicode(layer.dataProvider().name()))
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if vlayer.isValid():
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return vlayer
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else:
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QMessageBox.information(self, "Generate Regular Points", "Vector layer is not valid")
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# Get map layer by name from TOC
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def getMapLayerByName(self, myName):
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mc = self.iface.mapCanvas()
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nLayers = mc.layerCount()
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for l in range(nLayers):
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layer = mc.layer(l)
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if layer.name() == unicode(myName):
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if layer.isValid():
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return layer
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def regularize(self, bound, outPath, offset, value, gridType, inset, progressBar):
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area = bound.width() * bound.height()
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if offset:
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seed()
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if gridType:
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pointSpacing = value
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else:
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# Calculate grid spacing
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pointSpacing = sqrt(area / value)
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outFeat = QgsFeature()
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fields = { 0 : QgsField("ID", QVariant.Int) }
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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.WKBPoint, None)
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#writer = QgsVectorFileWriter(unicode(outPath), "CP1250", fields, QGis.WKBPoint, None)
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idVar = 0
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count = 10.00
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add = 90.00 / (area / pointSpacing)
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y = bound.yMaximum() - inset
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while y >= bound.yMinimum():
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x = bound.xMinimum() + inset
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while x <= bound.xMaximum():
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if offset:
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pGeom = QgsGeometry().fromPoint(QgsPoint(uniform(x - (pointSpacing / 2.0), x + (pointSpacing / 2.0)),
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uniform(y - (pointSpacing / 2.0), y + (pointSpacing / 2.0))))
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else:
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pGeom = QgsGeometry().fromPoint(QgsPoint(x, y))
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if pGeom.intersects(bound):
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outFeat.setGeometry(pGeom)
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outFeat.addAttribute(0, QVariant(idVar))
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writer.addFeature(outFeat)
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idVar = idVar + 1
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x = x + pointSpacing
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count = count + add
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progressBar.setValue(count)
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y = y - pointSpacing
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del writer
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