def main():
window = pygame.display.set_mode(
(WINDOW_WIDTH * PIXEL_SIZE, WINDOW_HEIGHT * PIXEL_SIZE))
pygame.display.set_caption('SNAKE GAME')
clock = pygame.time.Clock()
score = 0
snake = Snake(WINDOW_WIDTH, WINDOW_HEIGHT, PIXEL_SIZE, WINDOW_WIDTH / 2,
WINDOW_HEIGHT / 2)
food = Food(WINDOW_WIDTH, WINDOW_HEIGHT, PIXEL_SIZE)
run = True
while run:
for event in pygame.event.get():
if event.type == pygame.QUIT:
run = False
break
elif event.type == pygame.KEYDOWN:
if event.key == pygame.K_LEFT:
snake.change_direction(-1)
break
elif event.key == pygame.K_RIGHT:
snake.change_direction(+1)
break
snake.move()
if snake.collision_food(food.location):
score += 1
food.state = False
food.spawn(snake)
if snake.collision_obstacles():
print('over')
run = False
if snake.get_length() == WINDOW_WIDTH * WINDOW_HEIGHT:
print('win')
run = False
window.fill((0, 0, 0))
food.render(window)
snake.render(window)
pygame.display.set_caption('SNAKE GAME | Score: ' + str(score))
pygame.display.update()
clock.tick(FPS)
class Agent:
def __init__(self, code_id, log=False, visualization=False, fps=60):
self.code_id = code_id
self.snake = Snake(WINDOW_WIDTH, WINDOW_HEIGHT, PIXEL_SIZE,
WINDOW_WIDTH / 2, WINDOW_HEIGHT / 2)
self.food = Food(WINDOW_WIDTH, WINDOW_HEIGHT, PIXEL_SIZE)
self.food.spawn(self.snake)
self.log = log
self.visualization = visualization
self.window, self.clock = self.init_visualization()
self.fps = fps
# basic infos
self.alive = True
self.score = 0
self.step = 0
# useful infos
self.s_obstacles = self.get_surrounding_obstacles()
self.food_angle = self.get_food_angle()
self.food_distance = self.get_food_distance()
def init_visualization(self):
if self.visualization:
window = pygame.display.set_mode(
(WINDOW_WIDTH * PIXEL_SIZE, WINDOW_HEIGHT * PIXEL_SIZE))
fps = pygame.time.Clock()
return window, fps
else:
return None, None
def get_random_move(self, random_n=10):
# real random move, 1/random_n
if random_n is not 0 and random.randint(1, random_n) == 1:
return random.randint(-1, 1)
s, a, d = self.get_state()
# random move depend on state
ops = []
# select move based on following the food angle and avoiding the obstacles
if not s[0] and a < 0:
ops.insert(-1, -1)
if not s[1] and a == 0:
ops.insert(-1, 0)
if not s[2] and a > 0:
ops.insert(-1, +1)
# if no option
if not ops:
# select move based on avoiding obstacles
if not s[0]:
ops.insert(-1, -1)
if not s[1]:
ops.insert(-1, 0)
if not s[2]:
ops.insert(-1, +1)
# again, if no option -> just die
if not ops:
return random.randint(-1, 1)
else:
return ops[random.randint(0, len(ops) - 1)]
else:
return ops[random.randint(0, len(ops) - 1)]
def next_state(self, move_direction):
self.step += 1
info = 'CodeID: {} | Step: {} | Score: {}'.format(
self.code_id, self.step, self.score)
self.snake.change_direction(move_direction)
self.snake.move()
if self.snake.collision_food(self.food.location):
self.score += 1
self.food.state = False
self.food.spawn(self.snake)
if self.snake.collision_obstacles():
info += ' >> Game Over!'
self.alive = False
if self.snake.get_length() == WINDOW_WIDTH * WINDOW_HEIGHT:
info += ' >> Win!'
self.alive = False
if self.log:
print(info)
if self.visualization:
self.window.fill((0, 0, 0))
self.food.render(self.window)
self.snake.render(self.window)
pygame.display.set_caption(info)
pygame.display.update()
pygame.event.get()
self.clock.tick(self.fps)
return self.get_state()
def get_state(self):
return self.get_surrounding_obstacles(), self.get_food_angle(
), self.get_food_distance()
def get_surrounding_obstacles(self):
# check front
snake_head = self.snake.head
snake_heading_direction = self.snake.heading_direction
left = self.snake.moves[(snake_heading_direction - 1) %
len(self.snake.moves)]
front = self.snake.moves[snake_heading_direction]
right = self.snake.moves[(snake_heading_direction + 1) %
len(self.snake.moves)]
l_location = [snake_head[0] + left[0], snake_head[1] + left[1]]
f_location = [snake_head[0] + front[0], snake_head[1] + front[1]]
r_location = [snake_head[0] + right[0], snake_head[1] + right[1]]
s_locations = [l_location, f_location, r_location]
self.s_obstacles = [0, 0, 0]
# check wall
for i in range(0, len(s_locations)):
if s_locations[i][0] < 0 or s_locations[i][0] >= WINDOW_WIDTH \
or s_locations[i][1] < 0 or s_locations[i][1] >= WINDOW_HEIGHT:
self.s_obstacles[i] = 1
# check body
for b in self.snake.body:
if b in s_locations:
self.s_obstacles[s_locations.index(b)] = 1
return self.s_obstacles
def get_food_angle(self):
# get direction of heading
heading_direction = numpy.array(
self.snake.moves[self.snake.heading_direction])
# get direction of food (distant)
food_direction = numpy.array(self.food.location) - numpy.array(
self.snake.head)
h = heading_direction / numpy.linalg.norm(heading_direction)
f = food_direction / numpy.linalg.norm(food_direction)
fa = math.atan2(h[0] * f[1] - h[1] * f[0],
h[0] * f[0] + h[1] * f[1]) / math.pi
if fa == -1 or fa == 1:
fa = 1
self.food_angle = fa
return self.food_angle
def get_food_distance(self):
head = numpy.array(self.snake.head)
food = numpy.array(self.food.location)
max_dis = numpy.linalg.norm(
numpy.array([0, 0]) -
numpy.array([WINDOW_WIDTH - 1, WINDOW_HEIGHT - 1]))
dis = numpy.linalg.norm(head - food)
# normalize distance to the range 0 - 1
self.food_distance = dis / max_dis
return self.food_distance
