# -*- coding: utf-8 -*- #----------------------------------------------------------- # # Locate Line Intersections # # A QGIS plugin for locating line intersections, and exporting # them as a point shapefile. # # Copyright (C) 2008 Carson Farmer # # EMAIL: carson.farmer (at) gmail.com # WEB : www.geog.uvic.ca/spar/carson # #----------------------------------------------------------- # # 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_frmIntersectLines import Ui_Dialog class Dialog(QDialog, Ui_Dialog): def __init__(self, iface): QDialog.__init__(self) self.iface = iface # Set up the user interface from Designer. self.setupUi(self) QObject.connect(self.toolOut, SIGNAL("clicked()"), self.outFile) QObject.connect(self.inLine1, SIGNAL("currentIndexChanged(QString)"), self.update1) QObject.connect(self.inLine2, SIGNAL("currentIndexChanged(QString)"), self.update2) self.setWindowTitle( self.tr("Line intersections") ) self.buttonOk = self.buttonBox_2.button( QDialogButtonBox.Ok ) # populate layer list self.progressBar.setValue(0) mapCanvas = self.iface.mapCanvas() layers = ftools_utils.getLayerNames([QGis.Line]) self.inLine1.addItems(layers) self.inLine2.addItems(layers) def update1(self, inputLayer): self.inField1.clear() changedLayer = ftools_utils.getVectorLayerByName(unicode(inputLayer)) changedField = ftools_utils.getFieldList(changedLayer) for i in changedField: self.inField1.addItem(unicode(changedField[i].name())) def update2(self, inputLayer): self.inField2.clear() changedLayer = ftools_utils.getVectorLayerByName(unicode(inputLayer)) changedField = ftools_utils.getFieldList(changedLayer) for i in changedField: self.inField2.addItem(unicode(changedField[i].name())) def accept(self): self.buttonOk.setEnabled( False ) if self.inLine1.currentText() == "": QMessageBox.information(self, self.tr("Locate Line Intersections"), self.tr("Please specify input line layer") ) elif self.outShape.text() == "": QMessageBox.information(self, self.tr("Locate Line Intersections"), self.tr("Please specify output shapefile") ) elif self.inLine2.currentText() == "": QMessageBox.information(self, self.tr("Locate Line Intersections"), self.tr("Please specify line intersect layer") ) elif self.inField1.currentText() == "": QMessageBox.information(self, self.tr("Locate Line Intersections"), self.tr("Please specify input unique ID field") ) elif self.inField2.currentText() == "": QMessageBox.information(self, self.tr("Locate Line Intersections"), self.tr("Please specify intersect unique ID field") ) else: line1 = self.inLine1.currentText() line2 = self.inLine2.currentText() field1 = self.inField1.currentText() field2 = self.inField2.currentText() outPath = self.outShape.text() self.outShape.clear() self.compute(line1, line2, field1, field2, outPath, self.progressBar) self.progressBar.setValue(100) 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) if addToTOC == QMessageBox.Yes: if not ftools_utils.addShapeToCanvas( unicode( outPath ) ): QMessageBox.warning( self, self.tr("Geoprocessing"), self.tr( "Error loading output shapefile:\n%1" ).arg( 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( QString( self.shapefileName ) ) def compute(self, line1, line2, field1, field2, outPath, progressBar): layer1 = ftools_utils.getVectorLayerByName(line1) layer2 = ftools_utils.getVectorLayerByName(line2) provider1 = layer1.dataProvider() provider2 = layer2.dataProvider() allAttrs = provider1.attributeIndexes() provider1.select(allAttrs) allAttrs = provider2.attributeIndexes() provider2.select(allAttrs) fieldList = ftools_utils.getFieldList(layer1) index1 = provider1.fieldNameIndex(field1) field1 = fieldList[index1] field1.setName(unicode(field1.name()) + "_1") fieldList = ftools_utils.getFieldList(layer2) index2 = provider2.fieldNameIndex(field2) field2 = fieldList[index2] field2.setName(unicode(field2.name()) + "_2") fieldList = {0:field1, 1:field2} sRs = provider1.crs() check = QFile(self.shapefileName) if check.exists(): if not QgsVectorFileWriter.deleteShapeFile(self.shapefileName): return writer = QgsVectorFileWriter(self.shapefileName, self.encoding, fieldList, QGis.WKBPoint, sRs) #writer = QgsVectorFileWriter(outPath, "UTF-8", fieldList, QGis.WKBPoint, sRs) inFeat = QgsFeature() inFeatB = QgsFeature() outFeat = QgsFeature() inGeom = QgsGeometry() tempGeom = QgsGeometry() start = 15.00 add = 85.00 / layer1.featureCount() index = ftools_utils.createIndex( provider2 ) while provider1.nextFeature(inFeat): inGeom = inFeat.geometry() lineList = [] #(check, lineList) = layer2.featuresInRectangle(inGeom.boundingBox(), True, True) # Below is a work-around for featuresInRectangle # Which appears to have been removed for QGIS version 1.0 #layer2.select(inGeom.boundingBox(), False) #lineList = layer2.selectedFeatures() lineList = index.intersects( inGeom.boundingBox() ) if len(lineList) > 0: check = 0 else: check = 1 if check == 0: for i in lineList: provider2.featureAtId( int( i ), inFeatB , True, allAttrs ) tmpGeom = QgsGeometry( inFeatB.geometry() ) #tempGeom = i.geometry() tempList = [] atMap1 = inFeat.attributeMap() atMap2 = inFeatB.attributeMap() if inGeom.intersects(tmpGeom): tempGeom = inGeom.intersection(tmpGeom) if tempGeom.type() == QGis.Point: if tempGeom.isMultipart(): tempList = tempGeom.asMultiPoint() else: tempList.append(tempGeom.asPoint()) for j in tempList: outFeat.setGeometry(tempGeom.fromPoint(j)) outFeat.addAttribute(0, atMap1[index1]) outFeat.addAttribute(1, atMap2[index2]) writer.addFeature(outFeat) start = start + add progressBar.setValue(start) del writer