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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007-2009 Joshua Simmons <mud at majidejima dot com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#ifndef GOBAN_BOARD_H
#define GOBAN_BOARD_H
#include "types.h"
#include "goban.h" /* for LCD_BOARD_SIZE */
#define WHITE 1
#define BLACK 2
#define EMPTY 0
#define NONE 0
#define INVALID 4
#define OTHER(color) (color == BLACK ? WHITE : BLACK)
/* MAX_BOARD_SIZE no longer dependent on screen
size since zooming was implemented */
#define MAX_BOARD_SIZE 19
#define MIN_BOARD_SIZE 1
#define INVALID_POS ((unsigned short) -5003)
#define PASS_POS ((unsigned short) -5002)
#define POS(i, j) ((i + 1) + (j + 1) * (MAX_BOARD_SIZE + 2))
#define WEST(i) (i - 1)
#define EAST(i) (i + 1)
#define NORTH(i) (i - (MAX_BOARD_SIZE + 2))
#define SOUTH(i) (i + (MAX_BOARD_SIZE + 2))
unsigned short WRAP (unsigned short pos);
#define I(pos) (pos % (MAX_BOARD_SIZE + 2) - 1)
#define J(pos) (pos / (MAX_BOARD_SIZE + 2) - 1)
/* Clear the data from the board, including marks and such. Should be
called after setting the board size */
void clear_board (void);
/* Set the size of the board. Follow with a call to clear_board() and a
call to setup_display(). Returns false on failure (generally, invalid
width or height) */
bool set_size_board (int width, int height);
/* Returns true if the given move is legal. allow_suicide should be true
if suicide is a valid move with the current ruleset */
bool legal_move_board (unsigned short pos, unsigned char color,
bool allow_suicide);
/* Returns true if the pos is on the board */
bool on_board (unsigned short pos);
/* Get the color on the board at the given pos. Should be
BLACK/WHITE/EMPTY, and sometimes INVALID. */
unsigned char get_point_board (unsigned short pos);
/* Set the color of point at pos, which must be on the board */
void set_point_board (unsigned short pos, unsigned char color);
/* Get the number of liberties of the group of which pos is a stone.
Returns less than zero if pos is empty. If the number of liberties of
the group is greater than 2, 2 is returned. */
int get_liberties_board (unsigned short pos);
/* A simple flood fill algorithm for capturing or uncapturing stones.
Returns the number of locations changed. */
int flood_fill_board (unsigned short pos, unsigned char color);
/* The size of the board */
extern unsigned int board_width;
extern unsigned int board_height;
/* The number of captures for each player */
extern int black_captures;
extern int white_captures;
/* If there is a ko which cannot be retaken, this is set to the point
which may not be played at. Otherwise this is INVALID_POS. */
extern unsigned short ko_pos;
#endif
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