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198 lines
7.6 KiB
Python
Executable File
198 lines
7.6 KiB
Python
Executable File
#-----------------------------------------------------------
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#
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# Generate Vector Grid
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#
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# A QGIS plugin for generating a line or polygon grid
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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 ui_frmVectorGrid 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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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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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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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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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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boundBox = mLayer.extent()
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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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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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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(): polygon = True
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else: polygon = False
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self.outShape.clear()
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self.compute( boundBox, xSpace, ySpace, polygon )
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addToTOC = QMessageBox.question(self, self.tr("Generate Vector Grid"), self.tr("Created output shapefile:\n%1\n\nNote: Layer has no associated coordinate system, please use the Projection Management Tool to specify spatial reference system.\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.progressBar.setValue( 0 )
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def compute( self, bound, xOffset, yOffset, polygon ):
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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, None)
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#writer = QgsVectorFileWriter(outPath, "CP1250", fields, QGis.WKBPolygon, None)
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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, None)
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#writer = QgsVectorFileWriter(unicode(outPath), "CP1250", fields, QGis.WKBLineString, None)
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outFeat = QgsFeature()
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outGeom = QgsGeometry()
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idVar = 0
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self.progressBar.setRange( 0, 0 )
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if not polygon:
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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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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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else:
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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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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 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 unicode(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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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 unicode(layer.name()) == unicode(myName):
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if layer.isValid():
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return layer
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