#----------------------------------------------------------- # # 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("Line intersections") # populate layer list self.progressBar.setValue(0) mapCanvas = self.iface.mapCanvas() for i in range(mapCanvas.layerCount()): layer = mapCanvas.layer(i) if layer.type() == layer.VectorLayer: if layer.geometryType() == QGis.Line: self.inLine1.addItem(layer.name()) self.inLine2.addItem(layer.name()) def update1(self, inputLayer): self.inField1.clear() changedLayer = self.getVectorLayerByName(unicode(inputLayer)) changedField = self.getFieldList(changedLayer) for i in changedField: self.inField1.addItem(unicode(changedField[i].name())) def update2(self, inputLayer): self.inField2.clear() changedLayer = self.getVectorLayerByName(unicode(inputLayer)) changedField = self.getFieldList(changedLayer) for i in changedField: self.inField2.addItem(unicode(changedField[i].name())) def accept(self): if self.inLine1.currentText() == "": QMessageBox.information(self, "Locate Line Intersections", "Please specify input line layer") elif self.outShape.text() == "": QMessageBox.information(self, "Locate Line Intersections", "Please specify output shapefile") elif self.inLine2.currentText() == "": QMessageBox.information(self, "Locate Line Intersections", "Please specify line intersect layer") elif self.inField1.currentText() == "": QMessageBox.information(self, "Locate Line Intersections", "Please specify input unique ID field") elif self.inField2.currentText() == "": QMessageBox.information(self, "Locate Line Intersections", "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() if outPath.contains("\\"): outName = outPath.right((outPath.length() - outPath.lastIndexOf("\\")) - 1) else: outName = outPath.right((outPath.length() - outPath.lastIndexOf("/")) - 1) if outName.endsWith(".shp"): outName = outName.left(outName.length() - 4) self.outShape.clear() self.compute(line1, line2, field1, field2, outPath, self.progressBar) self.progressBar.setValue(100) addToTOC = QMessageBox.question(self, "Generate Centroids", "Created output point Shapefile:\n" + outPath + "\n\nWould you like to add the new layer to the TOC?", QMessageBox.Yes, QMessageBox.No, QMessageBox.NoButton) if addToTOC == QMessageBox.Yes: self.vlayer = QgsVectorLayer(outPath, unicode(outName), "ogr") QgsMapLayerRegistry.instance().addMapLayer(self.vlayer) self.progressBar.setValue(0) 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 = self.getVectorLayerByName(line1) layer2 = self.getVectorLayerByName(line2) provider1 = layer1.dataProvider() provider2 = layer2.dataProvider() allAttrs = provider1.attributeIndexes() provider1.select(allAttrs) allAttrs = provider2.attributeIndexes() provider2.select(allAttrs) fieldList = self.getFieldList(layer1) index1 = provider1.fieldNameIndex(field1) field1 = fieldList[index1] field1.setName("1_" + unicode(field1.name())) fieldList = self.getFieldList(layer2) index2 = provider2.fieldNameIndex(field2) field2 = fieldList[index2] field2.setName("2_" + unicode(field2.name())) 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() outFeat = QgsFeature() inGeom = QgsGeometry() tempGeom = QgsGeometry() start = 15.00 add = 85.00 / layer1.featureCount() 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() if len(lineList) > 0: check = 0 else: check = 1 if check == 0: for i in lineList: tempGeom = i.geometry() tempList = [] atMap1 = inFeat.attributeMap() atMap2 = i.attributeMap() if inGeom.intersects(tempGeom): tempGeom = inGeom.intersection(tempGeom) 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 def getVectorLayerByName(self, myName): mc = self.iface.mapCanvas() nLayers = mc.layerCount() for l in range(nLayers): layer = mc.layer(l) if layer.name() == unicode(myName): vlayer = QgsVectorLayer(unicode(layer.source()), unicode(myName), unicode(layer.dataProvider().name())) if vlayer.isValid(): return vlayer else: QMessageBox.information(self, "Locate Line Intersections", "Vector layer is not valid") def getFieldList(self, vlayer): fProvider = vlayer.dataProvider() feat = QgsFeature() allAttrs = fProvider.attributeIndexes() fProvider.select(allAttrs) myFields = fProvider.fields() return myFields