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#
# Ceibal Chess - A chess activity for Sugar.
# Copyright (C) 2008, 2009 Alejandro Segovia <asegovi@gmail.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 program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
#
from piece import *
from messenger import *
from chessengine import *
MODE_P_VS_CPU = 0
MODE_P_VS_P = 1
import logging
log = logging.getLogger()
class BoardController:
PLAYING = 'playing'
CHECKMATE = 'checkmate'
def __init__(self, board, mode = MODE_P_VS_P, debug=False):
'''Create a new board controller.'''
self.board = board
self.selected_cell = None
self.board.current_turn = self.board.black #will be flipped
self.board.next_turn() #set turn to white and show a message
self.game_state = BoardController.PLAYING
self.mode = mode
self.debug = debug
self.checkmate = False
self.ai = None
if mode == MODE_P_VS_CPU:
try:
self.ai = GnuChessEngine()
except Exception,ex:
log.error("Cannot start gnuchess. Defaulting to PvP.")
log.exception(ex)
self.mode = MODE_P_VS_P
#no last known player move
self.last_p_move = None
def close(self, message = None):
if self.ai:
self.ai.close()
self.ai = None
if message:
log.info(message + "\n")
def undo_move(self):
#FIXME: check if its possible to remove game_state variable.
#self.game_state = BoardController.PLAYING
if self.checkmate:
return
self.selected_cell = None #unselect piece (if any)
self.board.undo_move()
if self.ai:
self.ai.undo()
# first undo was ai move, now undo players
self.board.undo_move()
#TODO: Add castling and en-passant pawns indications.
def init_board_text(self, text):
'''Initialize board to a serialized position'''
column, row = 0, 0
kind_by_char = {'P': Pawn, 'N': Knight, 'B': Bishop,
'R': Rook, 'Q': Queen, 'K': King}
for char in text:
player = char.isupper() and self.board.white or self.board.black
kind = kind_by_char.get(char.upper())
if kind:
self.board.put_piece_at(kind(player), (column, row))
if column == 7:
column, row = -1, row + 1
column = column + 1
self.board.current_turn = self.board.white
self.checkmate = self.board.king_is_checkmated(self.board.current_turn)
def init_board(self):
'''Initialize board to starting chess configuration'''
self.init_board_text("rnbqkbnr" + "p" * 8 + "." * 32 + "P" * 8 + "RNBQKBNR")
def update(self):
'''
Perform updates on the board such as animations (not implemented yet)
and calling the IA.
'''
#TODO: Animate piece movements
#Call IA:
if self.ai and self.board.current_turn == self.board.black and \
self.game_state != BoardController.CHECKMATE:
if self.last_p_move:
self.ai.move(self.last_p_move, self)
if self.debug:
self.ai.assert_sync(self.board)
def on_checkmate(self):
'''Handle checkmate events.'''
self.close("Checkmated")
self.checkmate = True
def on_cell_clicked(self, clicked_cell):
'''Handle mouse events from the user. This method gets called
by the event control code when the user clicks on a cell.'''
# Select a piece?
if clicked_cell.piece and not self.selected_cell:
self.selected_cell = clicked_cell
else:
# Move piece or deselect
if self.selected_cell:
if self.selected_cell.piece.is_turn(self.board.current_turn) and \
(self.selected_cell != clicked_cell):
self.move_piece(clicked_cell)
else:
self.selected_cell = None
else:
pass
def move_piece(self, cell):
'''Move the currently selected piece to a new cell.
The currently selected piece is at self.selected_cell.'''
if self.checkmate:
return
# Try to move the piece on the board:
if self.board.can_move_piece_in_cell_to(self.selected_cell, cell.pos):
move = self.board.move_piece_in_cell_to(
self.board.current_turn,
self.selected_cell.pos,
cell.pos)
if self.ai:
self.last_p_move = move
self.selected_cell = None
else:
if cell.piece:
self.selected_cell = cell
def move(self, player, fro, to, **options):
'''
Move a piece from position "fro" to position "to".
This method checks whether a piece is actually at "fro" and that its
owner is the given "player" parameter.
"options" is an optional parameter used to provide move metadata, such
as the piece a pawn is crowned to.
'''
if self.checkmate:
return
log.debug("%s: %d, %d to %d, %d", player, fro[0], fro[1], to[0], to[1])
self.board.move_piece_in_cell_to(player, fro, to, **options)
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