public Location(long x,
    long y,
    float a) 
{
	vx=x;
	vy=y;
	alt=a;
}

 public static boolean equals(Location l1,
    Location l2) 
{
	if (l1.getX()==l2.getX() && l1.getY()==l2.getY() && l1.getAltitude()==l2.getAltitude()){return true;}
	else return false;
}

 public float getAltitude() 
{
	return alt;
}

 public static Vector getDifference(Location l1,
    Location l2) 
{
	Vector res=new Vector();
	Float f=new Float(l2.getAltitude()-l1.getAltitude());
	res.add(f);
	LongPoint p=new LongPoint(l2.getX()-l1.getX(),l2.getY()-l1.getY());
	res.add(p);
	return res;
}

returns the difference betzeen two locations (l2-l1, how much to go from l1 to l2) as a vector whose first element is the altitude difference and second element is a LongPoint for X,Y difference

 public long getX() 
{
	return vx;
}

 public long getY() 
{
	return vy;
}

 public  void setAltitude(float a) 
{
	alt=a;
}

 public LongPoint setPosition() 
{
	return new LongPoint(vx,vy);
}

 public  void setPosition(LongPoint p) 
{
	vx=p.x;
	vy=p.y;
}

 public  void setPositionX(long x) 
{
	vx=x;
}

 public  void setPositionY(long y) 
{
	vy=y;
}

 public String toString() 
{
	return "x="+vx+", y="+vy+", alt="+alt;
}