#DESIGN DOCUMENT#
"Canopus" design

class Board:
//class which provides methods that define a maze.

private final static int ROW;
private final static int COL;
private Piece[][] board;
//indicates for each location (in the maze) the walls around it
boolean[][][4] walls;
public static final int EAST=1, RIGHT=1;
public static final int WEST=2, LEFT=2;
public static final int NORTH=4, TOP=4;
public static final int SOUTH=8, BOTTOM=8;
//constructor
public Board(int row,int col)
public getRows()
public getColumns()
//returns the piece at the given location, returns null if there is nothing  
public Piece getPiece(int row, int col)
//puts the piece at the given row and column
public void(Piece piece, int row, int col)
//removes a piece
public void remove(int row, int col)

abstract class Piece extends Observable:
//abstract class (extends Observable) which provides methods that define a piece
private int row;
private int col;
public 
//constructor
public Piece()
public getRow()
public setRow()
public getCol()
public setCol()
//puts this piece at the given row and column
public void place(int row, int col)
//moves the piece to the given location, returns true if the move is legal
public boolean moveTo(int row, int col)
//removes the piece from the board
public void remove()
//paints this piece on the board
public abstract void paint(Graphic g)

class Robot extends Piece:
Board board;
//constructor
public Robot()
//paints this piece on the board
public void paint(Graphics g)
//returns a sequence of directions to reach the closest beeper
public List getPath()
/* moves the piece towards the given direction, returns true if the move is legal, increments the time by one */
public boolean move(int direction)

class Beeper extends Piece:
private int time;
Board board;
//constructor
public Beeper()
//paints this piece on the board
public void paint(Graphics g)
public getTime()
public setTime()

//main class
class BeeperHunt:
/* displays the GUI, initializes the maze, the robot and the 2 beepers */
public static void main(String arg0[])
//constructor
public BeeperHunt