136 lines
4 KiB
Python
136 lines
4 KiB
Python
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import pygame
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import re
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from constants import WIDTH, HEIGHT, ROWS, COLS, SQUARE_SIZE, LIGHT_BROWN, DARK_BROWN, PIECES
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class ChessBoard:
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def __init__(self):
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self.reset()
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### RL env part
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def reset(self):
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"""
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set up the board and the starting player
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"""
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self.board = self.create_board()
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self.current_player = 'white'
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def step(self,action):
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"""
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action: A string using natural language and/or chess notation
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Returns: observation, reward, done, info
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"""
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self.handle_input(action)
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# self.move_piece()
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observation = self.board
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reward = self.calculate_reward()
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done = self.check_game_over()
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info = {}
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return observation, reward, done, info
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def render(self, win):
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"""
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render the pygame window for visual feedback
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"""
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self.display(win)
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pygame.display.update()
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def close(self):
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pygame.quit()
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def check_game_over(self):
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if self.draw or self.checkmate or self.resign:
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return True
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else:
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return False
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### Actual game
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def create_board(self):
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board = [['' for _ in range(COLS)] for _ in range(ROWS)]
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# Assign unique IDs to each piece
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# Pawns
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for i in range(COLS):
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board[1][i] = 'black_pawn'
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board[6][i] = 'white_pawn'
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# Rooks
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board[0][0] = board[0][7] = 'black_rook'
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board[7][0] = board[7][7] = 'white_rook'
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# Knights
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board[0][1] = board[0][6] = 'black_knight'
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board[7][1] = board[7][6] = 'white_knight'
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# Bishops
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board[0][2] = board[0][5] = 'black_bishop'
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board[7][2] = board[7][5] = 'white_bishop'
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# Queens
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board[0][3] = 'black_queen'
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board[7][3] = 'white_queen'
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# Kings
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board[0][4] = 'black_king'
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board[7][4] = 'white_king'
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return board
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def display(self, win):
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# draw squares
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for row in range(ROWS):
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for col in range(COLS):
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color = LIGHT_BROWN if (row + col) % 2 == 0 else DARK_BROWN
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pygame.draw.rect(win, color, (col * SQUARE_SIZE, row * SQUARE_SIZE, SQUARE_SIZE, SQUARE_SIZE))
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# draw pieces
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for row in range(ROWS):
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for col in range(COLS):
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piece = self.board[row][col]
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if piece != '':
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base_piece_name = ''.join([i for i in piece])
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piece_image = PIECES[base_piece_name]
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piece_image = pygame.transform.scale(piece_image, (SQUARE_SIZE, SQUARE_SIZE))
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win.blit(piece_image, (col * SQUARE_SIZE, row * SQUARE_SIZE))
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def handle_input(self, input_text):
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col_map = {'a':0, 'b':1, 'c':2, 'd':3, 'e':4, 'f':5, 'g':6, 'h':7}
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row_map = {'1':7, '2':6, '3':5, '4':4, '5':3, '6':2, '7':1, '8':0}
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# TODO: Implement logic for actions without squares
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# This includes statements such as
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# "I capture your queen with my rook"
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# TODO: Implement logic for actions with mix of squares and names
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# Ex: "Queen to e5"
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# Ex: "a2 captures knight"
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# TODO: Implement logic for actions with only squares
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# Example: "e4 to e5"
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# TODO: Probably should spread the different modes across functions for clarity
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# smth like 'figure_pieces()' which figures out the two pieces (and if two pieces interact)
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# and smth like 'figure_squares' which figures out the two squares
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def move_piece(self, start_square, end_square):
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start_col, start_row = start_square
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piece = self.board[start_col][start_row]
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end_col, end_row = end_square
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end_spot = self.board[end_col][end_row]
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if end_spot == '':
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self.board[end_col][end_row] = piece
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elif 'black' in end_spot:
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self.capture(end_spot)
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self.board[end_col][end_row] = piece
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self.check_promotion()
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