root/trunk/PhysicalNode.java

// PhysicalNode - copyright Tom Felker, <tfelker2@uiuc.edu>, December 2004
//
// subclass of Node which adds position to a node

import java.io.*;
import java.awt.geom.*;

public class PhysicalNode extends Node implements Serializable {
        static final long serialVersionUID = 4056794241108685089L;
        
        public PhysicalNode(int id) {
                super(id);
                point = new Point2D.Double();
        }

        public PhysicalNode(int id, double x, double y) {
                super(id);
                point = new Point2D.Double(x, y);
        }

        
        // for debug purposes
        public String toString() {
                return "PhysicalNode\n" + infoToString();
        }

        public String infoToString() {
                return super.infoToString() + "\tx=" + point.getX() + "\n\ty=" + point.getY() + "\n";   
        }
        
        
        // returns a double representing our distance to the other node
        // only called by Edges
        public double distanceTo(PhysicalNode other) {
                return point.distance(other.point);
        }

        //WARNING: HCost cannot use previousNode otherwise it will break BusNode
        public Cost computeHCost(Search s, Node previousNode) {
                // heuristics go here
                //return new Cost(0);
                return new Cost(point.distance(s.destination.point) / s.fastestTransportationSpeed);
        }

        // for some stupid reason, points aren't serializable, so we must do it
        // ourselves - and I could make another serializable class, but i'm lazy
        // Note, this class is no longer serializeable.
        private void writeObject(java.io.ObjectOutputStream out) throws IOException {
                        out.writeDouble(point.x);
                        out.writeDouble(point.y);
        }

        private void readObject(java.io.ObjectInputStream in) throws IOException, ClassNotFoundException {
                point = new Point2D.Double(in.readDouble(), in.readDouble());
        }


        public transient Point2D.Double point;
}