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175 lines
8.1 KiB
Python
Executable File
175 lines
8.1 KiB
Python
Executable File
# -*- coding: utf-8 -*-
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#-----------------------------------------------------------
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#
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# Locate Line Intersections
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#
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# A QGIS plugin for locating line intersections, and exporting
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# them as a point shapefile.
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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_frmIntersectLines 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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# Set up the user interface from Designer.
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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.inLine1, SIGNAL("currentIndexChanged(QString)"), self.update1)
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QObject.connect(self.inLine2, SIGNAL("currentIndexChanged(QString)"), self.update2)
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self.setWindowTitle( self.tr("Line intersections") )
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self.buttonOk = self.buttonBox_2.button( QDialogButtonBox.Ok )
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# populate layer list
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self.progressBar.setValue(0)
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mapCanvas = self.iface.mapCanvas()
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layers = ftools_utils.getLayerNames([QGis.Line])
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self.inLine1.addItems(layers)
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self.inLine2.addItems(layers)
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def update1(self, inputLayer):
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self.inField1.clear()
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changedLayer = ftools_utils.getVectorLayerByName(unicode(inputLayer))
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changedField = ftools_utils.getFieldList(changedLayer)
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for i in changedField:
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self.inField1.addItem(unicode(changedField[i].name()))
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def update2(self, inputLayer):
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self.inField2.clear()
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changedLayer = ftools_utils.getVectorLayerByName(unicode(inputLayer))
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changedField = ftools_utils.getFieldList(changedLayer)
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for i in changedField:
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self.inField2.addItem(unicode(changedField[i].name()))
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def accept(self):
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self.buttonOk.setEnabled( False )
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if self.inLine1.currentText() == "":
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QMessageBox.information(self, self.tr("Locate Line Intersections"), self.tr("Please specify input line layer") )
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elif self.outShape.text() == "":
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QMessageBox.information(self, self.tr("Locate Line Intersections"), self.tr("Please specify output shapefile") )
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elif self.inLine2.currentText() == "":
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QMessageBox.information(self, self.tr("Locate Line Intersections"), self.tr("Please specify line intersect layer") )
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elif self.inField1.currentText() == "":
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QMessageBox.information(self, self.tr("Locate Line Intersections"), self.tr("Please specify input unique ID field") )
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elif self.inField2.currentText() == "":
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QMessageBox.information(self, self.tr("Locate Line Intersections"), self.tr("Please specify intersect unique ID field") )
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else:
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line1 = self.inLine1.currentText()
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line2 = self.inLine2.currentText()
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field1 = self.inField1.currentText()
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field2 = self.inField2.currentText()
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outPath = self.outShape.text()
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self.outShape.clear()
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self.compute(line1, line2, field1, field2, outPath, self.progressBar)
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self.progressBar.setValue(100)
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addToTOC = QMessageBox.question(self, self.tr("Generate Centroids"), self.tr("Created output point shapefile:\n%1\n\nWould you like to add the new layer to the TOC?").arg( outPath ), QMessageBox.Yes, QMessageBox.No, QMessageBox.NoButton)
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if addToTOC == QMessageBox.Yes:
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if not ftools_utils.addShapeToCanvas( unicode( outPath ) ):
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QMessageBox.warning( self, self.tr("Geoprocessing"), self.tr( "Error loading output shapefile:\n%1" ).arg( unicode( outPath ) ))
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self.progressBar.setValue(0)
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self.buttonOk.setEnabled( True )
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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 compute(self, line1, line2, field1, field2, outPath, progressBar):
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layer1 = ftools_utils.getVectorLayerByName(line1)
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layer2 = ftools_utils.getVectorLayerByName(line2)
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provider1 = layer1.dataProvider()
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provider2 = layer2.dataProvider()
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allAttrs = provider1.attributeIndexes()
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provider1.select(allAttrs)
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allAttrs = provider2.attributeIndexes()
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provider2.select(allAttrs)
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fieldList = ftools_utils.getFieldList(layer1)
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index1 = provider1.fieldNameIndex(field1)
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field1 = fieldList[index1]
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field1.setName(unicode(field1.name()) + "_1")
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fieldList = ftools_utils.getFieldList(layer2)
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index2 = provider2.fieldNameIndex(field2)
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field2 = fieldList[index2]
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field2.setName(unicode(field2.name()) + "_2")
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fieldList = {0:field1, 1:field2}
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sRs = provider1.crs()
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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, fieldList, QGis.WKBPoint, sRs)
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#writer = QgsVectorFileWriter(outPath, "UTF-8", fieldList, QGis.WKBPoint, sRs)
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inFeat = QgsFeature()
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inFeatB = QgsFeature()
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outFeat = QgsFeature()
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inGeom = QgsGeometry()
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tempGeom = QgsGeometry()
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start = 15.00
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add = 85.00 / layer1.featureCount()
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index = ftools_utils.createIndex( provider2 )
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while provider1.nextFeature(inFeat):
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inGeom = inFeat.geometry()
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lineList = []
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#(check, lineList) = layer2.featuresInRectangle(inGeom.boundingBox(), True, True)
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# Below is a work-around for featuresInRectangle
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# Which appears to have been removed for QGIS version 1.0
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#layer2.select(inGeom.boundingBox(), False)
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#lineList = layer2.selectedFeatures()
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lineList = index.intersects( inGeom.boundingBox() )
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if len(lineList) > 0: check = 0
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else: check = 1
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if check == 0:
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for i in lineList:
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provider2.featureAtId( int( i ), inFeatB , True, allAttrs )
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tmpGeom = QgsGeometry( inFeatB.geometry() )
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#tempGeom = i.geometry()
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tempList = []
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atMap1 = inFeat.attributeMap()
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atMap2 = inFeatB.attributeMap()
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if inGeom.intersects(tmpGeom):
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tempGeom = inGeom.intersection(tmpGeom)
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if tempGeom.type() == QGis.Point:
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if tempGeom.isMultipart():
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tempList = tempGeom.asMultiPoint()
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else:
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tempList.append(tempGeom.asPoint())
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for j in tempList:
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outFeat.setGeometry(tempGeom.fromPoint(j))
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outFeat.addAttribute(0, atMap1[index1])
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outFeat.addAttribute(1, atMap2[index2])
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writer.addFeature(outFeat)
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start = start + add
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progressBar.setValue(start)
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del writer
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