svn-gvsig-desktop / trunk / extensions / extGraph / src / com / iver / cit / gvsig / graph / solvers / ShortestPathSolverAStar.java @ 14780
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/* gvSIG. Sistema de Informaci?n Geogr?fica de la Generalitat Valenciana
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*
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* Copyright (C) 2004 IVER T.I. and Generalitat Valenciana.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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*
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* For more information, contact:
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*
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* Generalitat Valenciana
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* Conselleria d'Infraestructures i Transport
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* Av. Blasco Ib??ez, 50
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* 46010 VALENCIA
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* SPAIN
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*
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* +34 963862235
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* gvsig@gva.es
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* www.gvsig.gva.es
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*
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* or
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*
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* IVER T.I. S.A
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* Salamanca 50
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* 46005 Valencia
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* Spain
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*
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* +34 963163400
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* dac@iver.es
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*/
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package com.iver.cit.gvsig.graph.solvers; |
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import java.util.ArrayList; |
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import java.util.Stack; |
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import org.gvsig.exceptions.BaseException; |
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import com.hardcode.gdbms.driver.exceptions.ReadDriverException; |
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import com.hardcode.gdbms.engine.data.driver.DriverException; |
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import com.iver.cit.gvsig.fmap.core.IFeature; |
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import com.iver.cit.gvsig.fmap.core.IGeometry; |
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import com.iver.cit.gvsig.fmap.core.v02.FConverter; |
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import com.iver.cit.gvsig.fmap.layers.VectorialAdapter; |
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import com.iver.cit.gvsig.graph.NetworkUtils; |
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import com.iver.cit.gvsig.graph.core.AbstractNetSolver; |
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import com.iver.cit.gvsig.graph.core.GlobalCounter; |
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import com.iver.cit.gvsig.graph.core.GraphException; |
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import com.iver.cit.gvsig.graph.core.GvEdge; |
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import com.iver.cit.gvsig.graph.core.GvFlag; |
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import com.iver.cit.gvsig.graph.core.GvNode; |
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import com.iver.cit.gvsig.graph.core.IGraph; |
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import com.vividsolutions.jts.geom.Coordinate; |
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import com.vividsolutions.jts.geom.Geometry; |
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import com.vividsolutions.jts.geom.GeometryFactory; |
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import com.vividsolutions.jts.geom.LineString; |
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import com.vividsolutions.jts.geom.MultiLineString; |
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/**
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* @author fjp Este es ?til solo cuando podemos calcular la distancia estimada
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* entre 2 nodos. (Es decir, para temas de cartograf?a). Para analizar
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* relaciones creo que no servir?a).
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*/
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public class ShortestPathSolverAStar extends AbstractNetSolver { |
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protected Route route = new Route(); |
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private int fieldIndexStreetName; |
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private class InfoShp { |
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public int idArc; |
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public double pct; |
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public double cost; |
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public double distance; |
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public int direction; |
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public boolean bFlip; |
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} |
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public void setFielStreetName(String name) { |
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try {
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int aux = net.getLayer().getRecordset().getFieldIndexByName(name);
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if (aux == -1) |
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throw new RuntimeException("Field " + name + " not found."); |
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fieldIndexStreetName = aux; |
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} catch (BaseException e) {
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// TODO Auto-generated catch block
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e.printStackTrace(); |
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} |
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} |
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/**
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* @return a list of features
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* @throws GraphException
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*/
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public Route calculateRoute() throws GraphException { |
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GvFlag[] flags = net.getFlags();
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if (flags.length == 0) |
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throw new RuntimeException("Please, add flags before"); |
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int desde = 0; |
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int hasta = 1; |
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double elCoste1 = 0; |
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route = new Route();
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GvFlag fFrom = flags[0];
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fFrom.setCost(0);
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for (int i = 0; i < flags.length - 1; i++) { |
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fFrom = flags[desde]; |
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GvFlag fTo = flags[hasta]; |
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if (fFrom != fTo) {
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int idStart = net.creaArcosVirtuales(fFrom);
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int idStop = net.creaArcosVirtuales(fTo);
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double newCost = AStar(idStart, idStop);
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elCoste1 += newCost; |
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fTo.setCost(elCoste1); |
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if (newCost != Double.MAX_VALUE) { |
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try {
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populateRoute(fFrom, fTo, idStart, idStop); |
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} catch (DriverException e) {
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e.printStackTrace(); |
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throw new GraphException(e); |
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} |
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} else {
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// No way
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} |
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net.reconstruyeTramo(fFrom.getIdArc()); |
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net.reconstruyeTramo(fTo.getIdArc()); |
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desde = hasta; |
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} // if son puntos distintos
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hasta++; |
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} |
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return route;
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} |
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private void populateRouteSimple(int idStart, int idEnd) |
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throws ReadDriverException {
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int idEnlace;
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GvNode node; |
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GvEdge link; |
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double costeEntrada;
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// Trazar el camino desde idEnd hasta idStart hacia atr?s marcando los
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// Enlaces
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double Coste = 0; |
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double Coste2 = 0; |
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IGraph graph = net.getGraph(); |
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node = graph.getNodeByID(idEnd); |
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int from_link = node.getFromLink();
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VectorialAdapter va = (VectorialAdapter) net.getLayer().getSource(); |
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while (node.getIdNode() != idStart) {
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if (from_link == -1) { |
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throw new RuntimeException( |
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"Fallo al recorrer de manera inversa la soluci?n. Encontrado arco con -1");
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// break; // FALLO!!
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} |
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link = graph.getEdgeByID(from_link); |
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IFeature feat = va.getFeature(link.getIdArc()); |
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route.addRouteFeature(feat.getGeometry(), link.getIdArc(), link |
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.getWeight(), link.getDistance(), feat.getAttribute( |
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getFieldIndexStreetName()).toString()); |
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node = graph.getNodeByID(link.getIdNodeOrig()); |
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Coste = Coste + link.getWeight(); |
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Coste2 = Coste2 + link.getDistance(); |
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// TODO:
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// from_link = node.get_from_link(idEnlace, &costeEntrada);
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from_link = node.getFromLink(); |
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} |
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System.out.println("Salgo con node = " + node.getIdNode()); |
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} |
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private void populateRoute(GvFlag origin, GvFlag dest, int idStart, |
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int idEnd) throws DriverException { |
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int idEnlace;
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GvNode node; |
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GvEdge link; |
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double costeEntrada;
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// Trazar el camino desde idEnd hasta idStart hacia atr?s marcando los
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// Enlaces
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if (idStart == idEnd)
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return;
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IGraph graph = net.getGraph(); |
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node = graph.getNodeByID(idEnd); |
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int from_link = node.getFromLink();
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VectorialAdapter va = (VectorialAdapter) net.getLayer().getSource(); |
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try {
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va.start(); |
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/*
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* Miramos los nodos de los tramos inicio y final, y cogemos el nodo
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* que tenga el from_link rellenado. E IGUAL A NUMSOLUCGLOBAL!!!! A
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* partir de ah?, recorremos hacia atr?s y tenemos el cuerpo
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* principal del shape. Luego, para las puntas hay que tener en
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* cuenta los porcentajes, viendo el trozo que est? pegando a los
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* nodos que sabemos que est?n en el path
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*/
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/*
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* 22/9/2003 Corregimos el fallo que hab?a de escribir el shape de
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* atr?s adelante. Guardamos lo que necesitamos en listaShapes y
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* recorremos esa lista guardando los tramos con el sentido
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* adecuado.
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*/
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/*
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* 3/Febrero/2005 Limpieza de c?digo superfluo y correci?n de un
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* fallo raro. Ahora es m?s simple y parece que no falla. A ver si
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* dura. IDEA: quiz?s se necesite meter el porcentaje en los arcos
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* partidos.
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*/
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// Define a template class for a vector of IDs.
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InfoShp infoShp; |
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Stack pilaShapes = new Stack(); |
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// typedef stack<CInfoShp> PILAINFO;
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// PILAINFO pilaShapes;
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double costeTramoFinal = -1; |
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GvNode nodeEnd = graph.getNodeByID(idEnd); |
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GvEdge finalEdge = graph.getEdgeByID(nodeEnd.getFromLink()); |
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costeTramoFinal = finalEdge.getWeight(); |
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GvNode pNodo; |
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GvEdge pEnlace; |
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boolean bFlipearShape = false; |
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double pctMax, pctMin;
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// ////////////////////////////////////////////////////////////////////////////////////
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// Trozo del final
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// El shape va de idStop1 a idStop2, y el porcentaje viene en ese
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// sentido.
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// Si el idEnd es idStop1, quiere decir que el tramo que falta va en
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// ese sentido tambi?n,
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// as? que recorremos ese shape desde idStop1 hasta que rebasemos o
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// igualemos ese porcentaje.
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// Si no, hemos pasado por idStop2 y la parte que hay que meter es
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// desde el pto interior a idStop2
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// /////////////////////////////////////////////////////////////////////////////////////
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IFeature feat = va.getFeature(finalEdge.getIdArc()); |
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MultiLineString jtsGeom = (MultiLineString) feat.getGeometry() |
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.toJTSGeometry(); |
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// CoordinateFilter removeDuplicates = new
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// UniqueCoordinateArrayFilter();
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// jtsGeom.apply(removeDuplicates);
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// jtsGeom.geometryChanged();
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// SI ESTAMOS SOBRE EL MISMO TRAMO, CASO PARTICULAR
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// y el sentido de circulaci?n es correcto
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if ((origin.getIdArc() == dest.getIdArc())
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&& (nodeEnd.getBestCost() <= costeTramoFinal)) {
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if (dest.getPct() > origin.getPct()) {
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pctMax = dest.getPct(); |
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pctMin = origin.getPct(); |
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} else {
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pctMax = origin.getPct(); |
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pctMin = dest.getPct(); |
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bFlipearShape = true;
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} |
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LineString line = NetworkUtils.getPartialLineString(jtsGeom, |
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dest.getPct(), 1);
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pctMin = pctMin / pctMax; // Porque ha cambiado la longitud
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// del shape
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line = NetworkUtils.getPartialLineString(line, pctMin, 0);
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if (bFlipearShape)
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line = line.reverse(); |
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IGeometry geom = FConverter.jts_to_igeometry(line); |
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// TODO: Calcular bien el length de este arco,
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// basandonos en el porcentaje costeTramoFinal / costeOriginal
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route.addRouteFeature(geom, origin.getIdArc(), costeTramoFinal, |
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line.getLength(), feat.getAttribute( |
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getFieldIndexStreetName()).toString()); |
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return; // Deber?a sacar el coste |
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} |
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// Trazar el camino desde idEnd hasta idStart hacia atr?s marcando
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// los Enlaces
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pNodo = graph.getNodeByID(idEnd); |
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while ((pNodo.getIdNode() != idStart)) {
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idEnlace = pNodo.getFromLink(); |
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pEnlace = graph.getEdgeByID(idEnlace); |
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pNodo = graph.getNodeByID(pEnlace.getIdNodeOrig()); |
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infoShp = new InfoShp();
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infoShp.distance = pEnlace.getDistance(); |
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infoShp.cost = pEnlace.getWeight(); |
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if ((pEnlace.getIdArc() == origin.getIdArc())
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|| (pEnlace.getIdArc() == dest.getIdArc())) {
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if (pEnlace.getIdArc() == origin.getIdArc()) {
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infoShp.pct = origin.getPct(); |
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infoShp.idArc = origin.getIdArc(); |
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if (pEnlace.getDirec() == 0) { |
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infoShp.direction = 1;
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infoShp.bFlip = true;
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} else // Hemos pasado por el 2 |
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{
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infoShp.direction = 0;
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infoShp.bFlip = false;
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} // if else */
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} else {
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infoShp.pct = dest.getPct(); |
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infoShp.idArc = dest.getIdArc(); |
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if (pEnlace.getDirec() == 0) { |
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infoShp.direction = 0;
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infoShp.bFlip = true;
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} else {
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infoShp.direction = 1;
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infoShp.bFlip = false;
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} // if else */
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} |
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} else {
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infoShp.pct = 1.0;
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infoShp.idArc = pEnlace.getIdArc(); |
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infoShp.direction = 1;
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if (pEnlace.getDirec() == 1) |
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infoShp.bFlip = false;
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else
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infoShp.bFlip = true;
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} |
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pilaShapes.push(infoShp); |
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} |
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// Y ahora recorremos hacia atr?s el vector y escribimos los shapes.
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// VECTORINFO::iterator theIterator;
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int auxC = 0; |
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while (!pilaShapes.empty()) {
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infoShp = (InfoShp) pilaShapes.peek(); |
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feat = va.getFeature(infoShp.idArc); |
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MultiLineString line = (MultiLineString) feat.getGeometry() |
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.toJTSGeometry(); |
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// line.apply(removeDuplicates);
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// line.geometryChanged();
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LineString aux = null;
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if (infoShp.pct < 1.0) |
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aux = NetworkUtils.getPartialLineString(line, infoShp.pct, |
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infoShp.direction); |
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IGeometry geom = null;
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if (aux == null) { |
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if (infoShp.bFlip)
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line = line.reverse(); |
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geom = FConverter.jts_to_igeometry(line); |
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} else {
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if (infoShp.bFlip)
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aux = aux.reverse(); |
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geom = FConverter.jts_to_igeometry(aux); |
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} |
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route.addRouteFeature(geom, infoShp.idArc, infoShp.cost, |
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infoShp.distance, feat.getAttribute( |
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getFieldIndexStreetName()).toString()); |
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pilaShapes.pop(); |
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auxC++; |
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} |
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va.stop(); |
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} catch (BaseException e) {
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// TODO Auto-generated catch block
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e.printStackTrace(); |
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} |
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return;
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} |
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private int getFieldIndexStreetName() { |
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return fieldIndexStreetName;
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} |
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private double AStar(int idStart, int idStop) { |
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int nodeNum;
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int linkNum;
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double newCost;
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int idSiguienteNodo;
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GvNode node, toNode, finalNode, bestNode; // , *pNodoProv;
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GvEdge link; |
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boolean bExit = false; |
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boolean bGiroProhibido;
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ArrayList candidatos = new ArrayList(); |
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// char Mensaje[200];
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IGraph graph = net.getGraph(); |
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// NUEVO: 27-6-2003
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// Cada nodo y cada arco llevan un nuemero de soluci?n. Se supone
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// que si lo del nodo y el arco no coincide con
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// este numero, todav?a no ha sido inicializado y hay que hacerlo.
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// Para evitar coincidencias cuando de la vuelta el contador, cada
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// 65000 peticiones (por ejemplo), repasamos toda
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// la red y ponemos numSolucGlobal a -1
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if (GlobalCounter.increment())
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{
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for (nodeNum = 0; nodeNum < graph.numVertices(); nodeNum++) { |
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node = graph.getNodeByID(nodeNum); |
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node.initialize(); |
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} // for nodeNum */
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} |
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candidatos.clear(); |
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// A?adimos el Start Node a la lista de candidatosSTL
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// Nodo final
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finalNode = graph.getNodeByID(idStop); |
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finalNode.initialize(); |
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node = graph.getNodeByID(idStart); |
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node.initialize(); |
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bestNode = node; |
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candidatos.add(node); |
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node.setBestCost(0);
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node.setStatus(GvNode.statNowInList); |
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node.calculateStimation(finalNode, 0);
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// Mientras que la lista de candidatosSTL no est? vac?a, procesamos
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// Nodos
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double bestStimation;
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while ((!bExit) && (candidatos.size() > 0)) { |
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// Buscamos el nodo con m?nimo coste
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node = (GvNode) candidatos.get(0);
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bestNode = node; |
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bestStimation = node.getStimation(); |
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for (nodeNum = 1; nodeNum < candidatos.size(); nodeNum++) { |
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node = (GvNode) candidatos.get(nodeNum); |
| 467 |
if (node.getStimation() < bestStimation) {
|
| 468 |
bestStimation = node.getStimation(); |
| 469 |
bestNode = node; |
| 470 |
} |
| 471 |
} // for nodeNum candidatosSTL
|
| 472 |
|
| 473 |
node = bestNode; |
| 474 |
// Borramos el mejor nodo de la lista de candidatosSTL
|
| 475 |
node.setStatus(GvNode.statWasInList); |
| 476 |
// TODO: BORRAR POR INDEX, NO AS?. ES M?S LENTO QUE SI BORRAMOS EL
|
| 477 |
// i-?simo.
|
| 478 |
candidatos.remove(node); |
| 479 |
// System.out.println("LINK " + link.getIdArc() + " from ");
|
| 480 |
// System.out.println("from " + idStart + " to " +
|
| 481 |
// finalNode.getIdNode() + ". node=" + node.getIdNode());
|
| 482 |
// Miramos si hemos llegado donde quer?amos
|
| 483 |
if (bestNode.getIdNode() == idStop) {
|
| 484 |
bExit = true;
|
| 485 |
break;
|
| 486 |
} |
| 487 |
|
| 488 |
// sprintf(Mensaje,"Enlaces en el nodo %ld:
|
| 489 |
// %ld.",pNodo->idNodo,pNodo->Enlaces.GetSize());
|
| 490 |
// AfxMessageBox(Mensaje);
|
| 491 |
|
| 492 |
// A?adimos a la lista de candidatosSTL los vecinos del nodo que
|
| 493 |
// acabamos de borrar
|
| 494 |
// HAY Arcos QUE SALEN Y Arcos QUE LLEGAN. SOLO MIRAMOS LOS QUE
|
| 495 |
// SALEN.
|
| 496 |
for (linkNum = 0; linkNum < node.getEnlaces().size(); linkNum++) { |
| 497 |
// Pillamos el nodo vecino
|
| 498 |
link = (GvEdge) node.getEnlaces().get(linkNum); |
| 499 |
idSiguienteNodo = link.getIdNodeEnd(); |
| 500 |
|
| 501 |
toNode = graph.getNodeByID(idSiguienteNodo); |
| 502 |
|
| 503 |
// 27_5_2004
|
| 504 |
// Si un arco tiene coste negativo, lo ignoramos
|
| 505 |
if (link.getWeight() < 0) |
| 506 |
continue;
|
| 507 |
|
| 508 |
// Fin arco con coste negativo
|
| 509 |
|
| 510 |
// NUEVO: 26-7-2003: Comprobamos si est? inicializado
|
| 511 |
if (toNode.getNumSoluc() != GlobalCounter.getGlobalSolutionNumber()) {
|
| 512 |
toNode.initialize(); |
| 513 |
} else {
|
| 514 |
// System.out.println("Nodo ya inicializado");
|
| 515 |
} |
| 516 |
|
| 517 |
// Miramos a ver si podemos mejorar su best_cost
|
| 518 |
newCost = node.getBestCost() + link.getWeight(); |
| 519 |
|
| 520 |
if (newCost < toNode.getBestCost()) {
|
| 521 |
// Es una mejora, as? que actualizamos el vecino y
|
| 522 |
// lo a?adimos a los candidatosSTL
|
| 523 |
toNode.setBestCost(newCost); |
| 524 |
toNode.setFromLink(link.getIdEdge()); |
| 525 |
|
| 526 |
toNode.calculateStimation(finalNode, newCost); |
| 527 |
|
| 528 |
if (toNode.getStatus() != GvNode.statNowInList) {
|
| 529 |
toNode.setStatus(GvNode.statNowInList); |
| 530 |
candidatos.add(toNode); |
| 531 |
} |
| 532 |
} // Si hay mejora
|
| 533 |
|
| 534 |
} // for linkNum
|
| 535 |
} // while candidatosSTL
|
| 536 |
|
| 537 |
newCost = finalNode.getBestCost(); |
| 538 |
|
| 539 |
return newCost;
|
| 540 |
} |
| 541 |
|
| 542 |
} |