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AI_vs_human_version.py
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# importing the required packages
import pygame as pg
import sys
import numpy as np
import math
import random
# initializa pygame modules
pg.init()
# GAME CONSTANTS
GAME_NAME = 'Connect 4 Game'
ROW_COUNT = 6
COLUMN_COUNT = 7
PLAYER = 0
AI = 1
EMPTY = 0
PLAYER_PIECE = 1
AI_PIECE = 2
AI_level = 1
WINDOW_LENGTH = 4
# --- width and height of board ---
SQUARE_SIZE = 100
width = COLUMN_COUNT * SQUARE_SIZE
height = (ROW_COUNT+1) * SQUARE_SIZE
size = (width, height)
CIRCLE_RADIUS = int(SQUARE_SIZE/2 - 5)
screen = pg.display.set_mode(size)
turn = random.randint(PLAYER, AI)
game_over = False
myfont = pg.font.SysFont("monospace", 75)
# --- colors -------
BLUE = "#142d4c"
BLACK = "#9fd3c7"
RED = "#a2a8d3"
YELLOW = "#f95959"
# -----INNER BOARD------------
def create_board():
board = np.zeros((ROW_COUNT,COLUMN_COUNT))
return board
def drop_piece(board, row, col, piece):
board[row][col] = piece
def is_valid_location(board, col):
return board[ROW_COUNT-1][col] == 0
def get_next_open_row(board, col):
for r in range(ROW_COUNT):
if board[r][col] == 0:
return r
def print_board(board):
print(np.flip(board, 0))
def winning_move(board, piece):
# Check horizontal locations for win
for c in range(COLUMN_COUNT-3):
for r in range(ROW_COUNT):
if board[r][c] == piece and board[r][c+1] == piece and board[r][c+2] == piece and board[r][c+3] == piece:
return True
# Check vertical locations for win
for c in range(COLUMN_COUNT):
for r in range(ROW_COUNT-3):
if board[r][c] == piece and board[r+1][c] == piece and board[r+2][c] == piece and board[r+3][c] == piece:
return True
# Check positively sloped diaganols
for c in range(COLUMN_COUNT-3):
for r in range(ROW_COUNT-3):
if board[r][c] == piece and board[r+1][c+1] == piece and board[r+2][c+2] == piece and board[r+3][c+3] == piece:
return True
# Check negatively sloped diaganols
for c in range(COLUMN_COUNT-3):
for r in range(3, ROW_COUNT):
if board[r][c] == piece and board[r-1][c+1] == piece and board[r-2][c+2] == piece and board[r-3][c+3] == piece:
return True
def evaluate_window(window, piece):
score = 0
opp_piece = PLAYER_PIECE
if piece == PLAYER_PIECE:
opp_piece = AI_PIECE
if window.count(piece) == 4:
score += 100
elif window.count(piece) == 3 and window.count(EMPTY) == 1:
score += 5
elif window.count(piece) == 2 and window.count(EMPTY) == 2:
score += 2
if window.count(opp_piece) == 3 and window.count(EMPTY) == 1:
score -= 4
return score
def score_position(board, piece):
score = 0
## Score center column
center_array = [int(i) for i in list(board[:, COLUMN_COUNT//2])]
center_count = center_array.count(piece)
score += center_count * 3
## Score Horizontal
for r in range(ROW_COUNT):
row_array = [int(i) for i in list(board[r,:])]
for c in range(COLUMN_COUNT-3):
window = row_array[c:c+WINDOW_LENGTH]
score += evaluate_window(window, piece)
## Score Vertical
for c in range(COLUMN_COUNT):
col_array = [int(i) for i in list(board[:,c])]
for r in range(ROW_COUNT-3):
window = col_array[r:r+WINDOW_LENGTH]
score += evaluate_window(window, piece)
## Score posiive sloped diagonal
for r in range(ROW_COUNT-3):
for c in range(COLUMN_COUNT-3):
window = [board[r+i][c+i] for i in range(WINDOW_LENGTH)]
score += evaluate_window(window, piece)
for r in range(ROW_COUNT-3):
for c in range(COLUMN_COUNT-3):
window = [board[r+3-i][c+i] for i in range(WINDOW_LENGTH)]
score += evaluate_window(window, piece)
return score
def get_valid_locations(board):
valid_locations = []
for col in range(COLUMN_COUNT):
if is_valid_location(board, col):
valid_locations.append(col)
return valid_locations
def is_terminal_node(board):
return winning_move(board, PLAYER_PIECE) or winning_move(board, AI_PIECE) or len(get_valid_locations(board)) == 0
def minimax(board, depth, alpha, beta, maximizingPlayer):
valid_locations = get_valid_locations(board)
is_terminal = is_terminal_node(board)
if depth == 0 or is_terminal:
if is_terminal:
if winning_move(board, AI_PIECE):
return (None, 100000000000000)
elif winning_move(board, PLAYER_PIECE):
return (None, -10000000000000)
else: # Game is over, no more valid moves
return (None, 0)
else: # Depth is zero
return (None, score_position(board, AI_PIECE))
if maximizingPlayer:
value = -math.inf
column = random.choice(valid_locations)
for col in valid_locations:
row = get_next_open_row(board, col)
b_copy = board.copy()
drop_piece(b_copy, row, col, AI_PIECE)
new_score = minimax(b_copy, depth-1, alpha, beta, False)[1]
if new_score > value:
value = new_score
column = col
alpha = max(alpha, value)
if alpha >= beta:
break
return column, value
else: # Minimizing player
value = math.inf
column = random.choice(valid_locations)
for col in valid_locations:
row = get_next_open_row(board, col)
b_copy = board.copy()
drop_piece(b_copy, row, col, PLAYER_PIECE)
new_score = minimax(b_copy, depth-1, alpha, beta, True)[1]
if new_score < value:
value = new_score
column = col
beta = min(beta, value)
if alpha >= beta:
break
return column, value
def pick_best_move(board, piece):
"""
this function helps AI player to choose a random column
"""
valid_locations = get_valid_locations(board)
best_score = -10000
best_col = random.choice(valid_locations)
for col in valid_locations:
row = get_next_open_row(board, col)
temp_board = board.copy()
drop_piece(temp_board, row, col, piece)
score = score_position(temp_board, piece)
if score > best_score:
best_score = score
best_col = col
return best_col
def draw_board(board):
for c in range(COLUMN_COUNT):
for r in range(ROW_COUNT):
if board[r][c] == PLAYER_PIECE:
pg.draw.circle(screen, RED, (int(c*SQUARE_SIZE+SQUARE_SIZE/2), height-int(r*SQUARE_SIZE+SQUARE_SIZE/2)), CIRCLE_RADIUS)
elif board[r][c] == AI_PIECE:
pg.draw.circle(screen, YELLOW, (int(c*SQUARE_SIZE+SQUARE_SIZE/2), height-int(r*SQUARE_SIZE+SQUARE_SIZE/2)), CIRCLE_RADIUS)
pg.display.update()
def initiate_window():
#adding a color to the screen background
for c in range(COLUMN_COUNT):
for r in range(ROW_COUNT):
pg.draw.rect(screen, BLUE, (c*SQUARE_SIZE, r*SQUARE_SIZE+SQUARE_SIZE, SQUARE_SIZE, SQUARE_SIZE))
pg.draw.circle(screen, BLACK, (int(c*SQUARE_SIZE+SQUARE_SIZE/2), int(r*SQUARE_SIZE+SQUARE_SIZE+SQUARE_SIZE/2)), CIRCLE_RADIUS)
# naming the game
pg.display.set_caption(GAME_NAME)
pg.display.update()
def restart(board):
initiate_window()
for i in range(ROW_COUNT):
for j in range(COLUMN_COUNT):
board[i][j] = 0
global game_over
game_over = False
global turn
turn = random.randint(PLAYER, AI)
pg.display.update()
def is_full(board):
for r in range(ROW_COUNT):
for c in range(COLUMN_COUNT):
return not (board[r][c] == 0)
def AI_rnd_or_minimax(AI_level, board):
if AI_level == 1:
col, minimax_score = minimax(board, 5, -math.inf, math.inf, True)
print("minimax mode chosen")
else:
col = pick_best_move(board, AI_PIECE)
print("random mode chosen")
return col
board = create_board()
initiate_window()
draw_board(board)
while not game_over:
for event in pg.event.get():
if event.type == pg.QUIT:
pg.quit()
sys.exit()
if event.type == pg.MOUSEMOTION:
pg.draw.rect(screen, BLACK, (0,0, width, SQUARE_SIZE))
posx = event.pos[0]
if turn == PLAYER:
pg.draw.circle(screen, RED, (posx, int(SQUARE_SIZE/2)), CIRCLE_RADIUS)
pg.display.update()
if event.type == pg.MOUSEBUTTONDOWN:
pg.draw.rect(screen, BLACK, (0,0, width, SQUARE_SIZE))
#print(event.pos)
# Ask for Player 1 Input
if turn == PLAYER:
posx = event.pos[0]
col = int(math.floor(posx/SQUARE_SIZE))
if is_valid_location(board, col):
row = get_next_open_row(board, col)
drop_piece(board, row, col, PLAYER_PIECE)
if winning_move(board, PLAYER_PIECE):
label = myfont.render("Player 1 wins!!", 1, RED)
screen.blit(label, (40,10))
game_over = True
turn += 1
turn = turn % 2
print_board(board)
draw_board(board)
# # Ask for Player 2 Input
if turn == AI and not game_over:
col = AI_rnd_or_minimax(AI_level, board)
if is_valid_location(board, col):
#pygame.time.wait(500)
row = get_next_open_row(board, col)
drop_piece(board, row, col, AI_PIECE)
if winning_move(board, AI_PIECE):
label = myfont.render("Player 2 wins!!", 1, YELLOW)
screen.blit(label, (40,10))
game_over = True
print_board(board)
draw_board(board)
turn += 1
turn = turn % 2
if (event.type == pg.KEYDOWN and event.key == pg.K_r):
print("game over 1 ", game_over)
restart(board)
if game_over or is_full(board):
print("game over 2 ", game_over)
pg.time.wait(3000)
restart(board)