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runner.py
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runner.py
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"""
Play chess against an AI
"""
import random
import os
import sys
import time
# niklasf/python-chess is licensed under GPL-3.0
import chess
import pygame as pg
from pygame import gfxdraw
import termcolor
import chess50
# Screen size
SIZE = WIDTH, HEIGHT = 500, 600
# Fonts
REGULAR_FONT = os.path.join('assets', 'fonts', 'JetBrainsMono-Regular.ttf')
BOLD_FONT = os.path.join('assets', 'fonts', 'JetBrainsMono-Bold.ttf')
# Colors
WHITE = (255, 255, 255)
GRAY = (192, 192, 192)
BLACK = (0, 0, 0)
HIGHLIGHT = (16, 128, 255)
# Square constants
CORNER_RADIUS = 10
SQUARE_SIZE = 50
SQUARE_ORIGIN = (
WIDTH / 2 - SQUARE_SIZE * 4,
HEIGHT / 2 - SQUARE_SIZE * 4
)
def main():
# Initialize pygame
pg.init()
pg.display.set_caption('chess50')
screen = pg.display.set_mode(SIZE)
# Font sizes
label_font = pg.font.Font(BOLD_FONT, 12)
message_font = pg.font.Font(REGULAR_FONT, 20)
# Chess piece icons
icon = {}
for piece in 'PNBRQKpnbrqk':
side = 'w' if piece.isupper() else 'b'
path = os.path.join('assets', 'images', side + piece + '.svg')
icon[piece] = pg.image.load(path)
# Initialize players
user = None
ai = chess50.ChessAI()
ai_turn = False
# Set up chessboard
board = chess.Board()
selected_piece = None
pawn_promoted = False
game_over = False
user_resigned = False
while True:
# Exit condition
for event in pg.event.get():
if event.type == pg.QUIT:
pg.quit()
sys.exit()
screen.fill(BLACK)
# Let user choose a side
if user is None:
# Game title
title = message_font.render("chess50", True, WHITE)
title_rect = title.get_rect()
title_rect.center = WIDTH / 2, HEIGHT * 11 / 12
screen.blit(title, title_rect)
# Play as White button
play_white_button = pg.draw.circle(screen, WHITE, (WIDTH / 2, HEIGHT * 3 / 10), 32)
draw_circle(screen, WHITE, (WIDTH / 2, HEIGHT * 3 / 10), 33)
play_white = icon['K']
play_white_rect = play_white.get_rect()
play_white_rect.center = play_white_button.center
screen.blit(play_white, play_white_rect)
# Play as random side button
play_random_button = pg.draw.circle(screen, WHITE, (WIDTH / 2, HEIGHT / 2), 49)
draw_circle(screen, WHITE, (WIDTH / 2, HEIGHT / 2), 50)
play_random = pg.image.load(os.path.join('assets', 'images', 'random.png'))
play_random_rect = play_random.get_rect()
play_random_rect.center = play_random_button.center
screen.blit(play_random, play_random_rect)
# Play as Black button
play_black_button = pg.draw.circle(screen, WHITE, (WIDTH / 2, HEIGHT * 7 / 10), 32)
draw_circle(screen, WHITE, (WIDTH / 2, HEIGHT * 7 / 10), 33)
play_black = icon['k']
play_black_rect = play_black.get_rect()
play_black_rect.center = play_black_button.center
screen.blit(play_black, play_black_rect)
# Check which Play button was clicked
if pg.mouse.get_pressed()[0]:
mouse = pg.mouse.get_pos()
if play_white_button.collidepoint(mouse):
time.sleep(0.2)
user = chess.WHITE
elif play_random_button.collidepoint(mouse):
time.sleep(0.2)
user = random.randint(0, 1)
elif play_black_button.collidepoint(mouse):
time.sleep(0.2)
user = chess.BLACK
termcolor.cprint("If the text is green, the AI thinks it is winning;", 'green')
termcolor.cprint("losing if it is red", 'red')
print()
print("Move Value")
# Flip the ranks and files depending on which side is the user
if user == chess.WHITE:
ranks = chess.RANK_NAMES[::-1]
files = chess.FILE_NAMES
else:
ranks = chess.RANK_NAMES
files = chess.FILE_NAMES[::-1]
else: # if the game has started
squares = []
occupied = board.piece_map()
for i, rank in enumerate(ranks):
row = []
for j, file in enumerate(files):
# Squares
square_rect = pg.Rect(
SQUARE_ORIGIN[0] + SQUARE_SIZE * j,
SQUARE_ORIGIN[1] + SQUARE_SIZE * i,
SQUARE_SIZE,
SQUARE_SIZE
)
# Draw chessboard with rounded corners
square_color = (
HIGHLIGHT if selected_piece and selected_piece == file + rank else
WHITE if (i + j) % 2 == 0 else
GRAY
)
if i == 0 and j == 0:
pg.draw.rect(
screen,
square_color,
square_rect,
border_top_left_radius=CORNER_RADIUS
)
elif i == 0 and j == 7:
pg.draw.rect(
screen,
square_color,
square_rect,
border_top_right_radius=CORNER_RADIUS
)
elif i == 7 and j == 0:
pg.draw.rect(
screen,
square_color,
square_rect,
border_bottom_left_radius=CORNER_RADIUS
)
elif i == 7 and j == 7:
pg.draw.rect(
screen,
square_color,
square_rect,
border_bottom_right_radius=CORNER_RADIUS
)
else:
pg.draw.rect(
screen,
square_color,
square_rect
)
square = chess.parse_square(file + rank)
# Show legal moves visually after selecting a piece to move
if selected_piece:
if not selected_piece == file + rank:
try:
move = board.find_move(
chess.parse_square(selected_piece),
chess.parse_square(file + rank)
)
if move in board.legal_moves:
# Legal moves to empty squares
if square not in occupied:
draw_circle(screen, HIGHLIGHT, square_rect.center, 7)
# Pieces that can be captured and rooks in castling
else:
pg.draw.rect(screen, HIGHLIGHT, square_rect)
pg.draw.rect(
screen,
WHITE if (i + j) % 2 == 0 else GRAY,
square_rect,
border_radius=15
)
except ValueError:
pass
# Rank and file names
if j == 0:
rank_name = label_font.render(
rank, True,
GRAY if (i + j) % 2 == 0 else WHITE
)
rank_name_rect = rank_name.get_rect()
rank_name_rect.center = (
square_rect[0] + SQUARE_SIZE / 8,
square_rect[1] + SQUARE_SIZE / 5
)
screen.blit(rank_name, rank_name_rect)
if i == 7:
file_name = label_font.render(
file, True,
GRAY if (i + j) % 2 == 0 else WHITE
)
file_name_rect = file_name.get_rect()
file_name_rect.center = (
square_rect[0] + SQUARE_SIZE / 8,
square_rect[1] + SQUARE_SIZE * 4 / 5,
)
screen.blit(file_name, file_name_rect)
# Chess pieces
if square in occupied:
piece = occupied[square].symbol()
piece = icon[piece]
pieceRect = piece.get_rect()
pieceRect.center = square_rect.center
screen.blit(piece, pieceRect)
row.append(square_rect)
squares.append(row)
if not game_over: # yet
# If AI's turn
if not board.turn == user:
# AI is thinking of a move
ai_thinking = message_font.render("AI is thinking...", True, WHITE)
ai_thinking_rect = ai_thinking.get_rect()
ai_thinking_rect.center = WIDTH / 2, HEIGHT / 12
screen.blit(ai_thinking, ai_thinking_rect)
if ai_turn:
time.sleep(0.5)
value, move = ai.minimax(board)
termcolor.cprint(
f"{move} {value}",
'green' if (board.turn == chess.WHITE and value > 0) or (board.turn == chess.BLACK and value < 0) else
'white' if not value else
'red'
)
board.push(move)
ai_turn = False
else:
ai_turn = True
else: # if user's turn
# Handle pawn promotion
if pawn_promoted:
options = {}
for i, symbol in enumerate('QRBN' if user == chess.WHITE else 'qrbn'):
option_button = pg.draw.circle(screen, WHITE, (SQUARE_SIZE*2*(i+1), 50), 32)
draw_circle(screen, WHITE, (SQUARE_SIZE*2*(i+1), 50), 33)
option = icon[symbol]
option_rect = option.get_rect()
option_rect.center = option_button.center
screen.blit(option, option_rect)
options[symbol] = option_button
if pg.mouse.get_pressed()[0]:
for symbol in ('QRBN' if user == chess.WHITE else 'qrbn'):
if options[symbol].collidepoint(pg.mouse.get_pos()):
time.sleep(0.2)
board.push_san(move.uci()[:4] + symbol.lower())
pawn_promoted = False
if pawn_promoted:
selected_piece = None
pawn_promoted = False
resign_button = pg.draw.circle(screen, WHITE, (WIDTH / 2, HEIGHT * 11 / 12), 24)
draw_circle(screen, WHITE, (WIDTH / 2, HEIGHT * 11 / 12), 25)
draw_circle(screen, BLACK, (WIDTH / 2, HEIGHT * 11 / 12), 22)
resign = pg.image.load(os.path.join('assets', 'images', 'flag.png'))
resign_rect = resign.get_rect()
resign_rect.center = WIDTH / 2 + 2, HEIGHT * 11 / 12 + 1
screen.blit(resign, resign_rect)
if pg.mouse.get_pressed()[0]:
if resign_button.collidepoint(pg.mouse.get_pos()):
time.sleep(0.2)
user_resigned = True
user_pieces = {
square
for square, piece in occupied.items()
if piece.color == user
}
# If user has clicked somewhere on the screen
if not pawn_promoted:
if pg.mouse.get_pressed()[0]:
for i, rank in enumerate(ranks):
for j, file in enumerate(files):
# If user clicked one of the squares
if squares[i][j].collidepoint(pg.mouse.get_pos()):
time.sleep(0.2)
# and one of user's pieces is on that square
if chess.parse_square(file + rank) in user_pieces:
# If user has already selected a piece
# and clicked that piece again
if selected_piece and file + rank == selected_piece:
selected_piece = None
# If user hasn't selected a piece to move yet
else:
selected_piece = file + rank
# Else if a piece has already been chosen
# and it's not another of user's pieces
elif selected_piece:
try:
# Find a legal move
move = board.find_move(
chess.parse_square(selected_piece),
chess.parse_square(file + rank)
)
# If move is not a pawn promotion
if len(move.uci()) < 5:
board.push(move)
else:
pawn_promoted = True
except ValueError:
pass
selected_piece = None
else: # if the game is over
result = (
"Draw" if winner == None else
"You win" if winner == user else
"AI wins"
)
result = message_font.render(result, True, WHITE)
result_rect = result.get_rect()
result_rect.center = WIDTH / 2, HEIGHT / 12
screen.blit(result, result_rect)
# Draw Play Again button
again_button = pg.Rect(WIDTH / 2, HEIGHT / 2, WIDTH / 3, 56)
again_button.center = WIDTH / 2, HEIGHT - HEIGHT / 12
pg.draw.rect(screen, WHITE, again_button, border_radius=CORNER_RADIUS)
again = message_font.render("PLAY AGAIN", True, BLACK)
again_rect = again.get_rect()
again_rect.center = again_button.center
screen.blit(again, again_rect)
if pg.mouse.get_pressed()[0]:
if again_button.collidepoint(pg.mouse.get_pos()):
time.sleep(0.2)
board.reset()
user = None
ai_turn = False
game_over = False
selected_piece = False
pawn_promoted = False
user_resigned = False
# User resigns
if user_resigned:
selected_piece = False
game_over = True
winner = not user
# Game is over not due to user resigning
elif game_over := board.outcome():
winner = game_over.winner
pg.display.flip()
def draw_circle(surface, color, center, radius):
"""
Draw an antialiased circle
Instructions from https://www.pygame.org/docs/ref/gfxdraw.html
"""
x, y = int(center[0]), int(center[1])
gfxdraw.aacircle(surface, x, y, radius, color)
gfxdraw.filled_circle(surface, x, y, radius, color)
if __name__ == '__main__':
main()