-
Notifications
You must be signed in to change notification settings - Fork 292
/
connect4_with_ai.py
290 lines (230 loc) · 7.86 KB
/
connect4_with_ai.py
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
import numpy as np
import random
import pygame
import sys
import math
BLUE = (0,0,255)
BLACK = (0,0,0)
RED = (255,0,0)
YELLOW = (255,255,0)
ROW_COUNT = 6
COLUMN_COUNT = 7
PLAYER = 0
AI = 1
EMPTY = 0
PLAYER_PIECE = 1
AI_PIECE = 2
WINDOW_LENGTH = 4
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 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 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 pick_best_move(board, piece):
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):
pygame.draw.rect(screen, BLUE, (c*SQUARESIZE, r*SQUARESIZE+SQUARESIZE, SQUARESIZE, SQUARESIZE))
pygame.draw.circle(screen, BLACK, (int(c*SQUARESIZE+SQUARESIZE/2), int(r*SQUARESIZE+SQUARESIZE+SQUARESIZE/2)), RADIUS)
for c in range(COLUMN_COUNT):
for r in range(ROW_COUNT):
if board[r][c] == PLAYER_PIECE:
pygame.draw.circle(screen, RED, (int(c*SQUARESIZE+SQUARESIZE/2), height-int(r*SQUARESIZE+SQUARESIZE/2)), RADIUS)
elif board[r][c] == AI_PIECE:
pygame.draw.circle(screen, YELLOW, (int(c*SQUARESIZE+SQUARESIZE/2), height-int(r*SQUARESIZE+SQUARESIZE/2)), RADIUS)
pygame.display.update()
board = create_board()
print_board(board)
game_over = False
pygame.init()
SQUARESIZE = 100
width = COLUMN_COUNT * SQUARESIZE
height = (ROW_COUNT+1) * SQUARESIZE
size = (width, height)
RADIUS = int(SQUARESIZE/2 - 5)
screen = pygame.display.set_mode(size)
draw_board(board)
pygame.display.update()
myfont = pygame.font.SysFont("monospace", 75)
turn = random.randint(PLAYER, AI)
while not game_over:
for event in pygame.event.get():
if event.type == pygame.QUIT:
sys.exit()
if event.type == pygame.MOUSEMOTION:
pygame.draw.rect(screen, BLACK, (0,0, width, SQUARESIZE))
posx = event.pos[0]
if turn == PLAYER:
pygame.draw.circle(screen, RED, (posx, int(SQUARESIZE/2)), RADIUS)
pygame.display.update()
if event.type == pygame.MOUSEBUTTONDOWN:
pygame.draw.rect(screen, BLACK, (0,0, width, SQUARESIZE))
#print(event.pos)
# Ask for Player 1 Input
if turn == PLAYER:
posx = event.pos[0]
col = int(math.floor(posx/SQUARESIZE))
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 = random.randint(0, COLUMN_COUNT-1)
#col = pick_best_move(board, AI_PIECE)
col, minimax_score = minimax(board, 5, -math.inf, math.inf, True)
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 game_over:
pygame.time.wait(3000)