root/trunk/PhysicalEdge.java

// PhysicalEdge - copyright Tom Felker, <tfelker2@uiuc.edu>, December 2004
//
// subclass of edge that connects two physical nodes

import java.io.*;

public class PhysicalEdge extends Edge implements Serializable {

        public PhysicalEdge(int a, int b) {
                super(a, b);
        }

        public Cost computeDeltaGCost(Node from, Cost gCostOfFrom, Search s) {
                return new Cost(((PhysicalNode)from).distanceTo(((PhysicalNode)getOtherNode(from))) / s.walkingSpeed );
        }

        // we could cache the distance or cost calculation if we wanted to
        // but maybe it won't be used that often
        // optimize later...

}