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snake_game.py
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snake_game.py
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import pygame
import random
from enum import Enum
from collections import namedtuple
pygame.init()
font = pygame.font.Font('arial.ttf', 25)
#font = pygame.font.SysFont('arial', 25)
# code for agent:
# reset function so the agent can reset the game
# reward function
# play(action) function -> compute directions
# keep track/game_iteration
# is_collision
class Direction(Enum):
RIGHT = 1
LEFT = 2
UP = 3
DOWN = 4
Point = namedtuple('Point', 'x, y')
# rgb colors
WHITE = (255, 255, 255)
RED = (200,0,0)
BLUE1 = (0, 0, 255)
BLUE2 = (0, 100, 255)
BLACK = (0,0,0)
BLOCK_SIZE = 20
SPEED = 20
class SnakeGame:
def __init__(self, w=640, h=480):
self.w = w
self.h = h
# init display
self.display = pygame.display.set_mode((self.w, self.h))
pygame.display.set_caption('Snake')
self.clock = pygame.time.Clock()
# init game state
self.direction = Direction.RIGHT
self.head = Point(self.w/2, self.h/2)
self.snake = [self.head,
Point(self.head.x-BLOCK_SIZE, self.head.y),
Point(self.head.x-(2*BLOCK_SIZE), self.head.y)]
self.score = 0
self.food = None
self._place_food()
def _place_food(self):
x = random.randint(0, (self.w-BLOCK_SIZE )//BLOCK_SIZE )*BLOCK_SIZE
y = random.randint(0, (self.h-BLOCK_SIZE )//BLOCK_SIZE )*BLOCK_SIZE
self.food = Point(x, y)
if self.food in self.snake:
self._place_food()
def play_step(self):
# 1. collect user input
for event in pygame.event.get():
if event.type == pygame.QUIT:
pygame.quit()
quit()
if event.type == pygame.KEYDOWN:
if event.key == pygame.K_LEFT:
self.direction = Direction.LEFT
elif event.key == pygame.K_RIGHT:
self.direction = Direction.RIGHT
elif event.key == pygame.K_UP:
self.direction = Direction.UP
elif event.key == pygame.K_DOWN:
self.direction = Direction.DOWN
# 2. move
self._move(self.direction) # update the head
self.snake.insert(0, self.head)
# 3. check if game over
game_over = False
if self.is_collision():
game_over = True
return game_over, self.score
# 4. place new food or just move
if self.head == self.food:
self.score += 1
self._place_food()
else:
self.snake.pop()
# 5. update ui and clock
self._update_ui()
self.clock.tick(SPEED)
# 6. return game over and score
return game_over, self.score
def _is_collision(self):
# hits boundary
if self.head.x > self.w - BLOCK_SIZE or self.head.x < 0 or self.head.y > self.h - BLOCK_SIZE or self.head.y < 0:
return True
# hits itself
if self.head in self.snake[1:]:
return True
return False
def _update_ui(self):
self.display.fill(BLACK)
for pt in self.snake:
pygame.draw.rect(self.display, BLUE1, pygame.Rect(pt.x, pt.y, BLOCK_SIZE, BLOCK_SIZE))
pygame.draw.rect(self.display, BLUE2, pygame.Rect(pt.x+4, pt.y+4, 12, 12))
pygame.draw.rect(self.display, RED, pygame.Rect(self.food.x, self.food.y, BLOCK_SIZE, BLOCK_SIZE))
text = font.render("Score: " + str(self.score), True, WHITE)
self.display.blit(text, [0, 0])
pygame.display.flip()
def _move(self, direction):
x = self.head.x
y = self.head.y
if direction == Direction.RIGHT:
x += BLOCK_SIZE
elif direction == Direction.LEFT:
x -= BLOCK_SIZE
elif direction == Direction.DOWN:
y += BLOCK_SIZE
elif direction == Direction.UP:
y -= BLOCK_SIZE
self.head = Point(x, y)
if __name__ == '__main__':
game = SnakeGame()
# game loop
while True:
game_over, score = game.play_step()
if game_over == True:
break
print('Final Score', score)
pygame.quit()