"""
显示在ssd1306上的贪吃蛇游戏
运行后，可以通过按任意按钮启动游戏。
默认情况下，蛇初始时从左到右移动。游戏的目的是收集尽可能多的水果，水果将随机放置。
随着每吃一个水果，蛇就会变得更长。
当蛇撞到墙上或它自己时，游戏结束，显示Gameover。
此时可通过按任意按钮，将游戏还原为起始值，然后触摸按钮即可再次启动游戏。
"""
import random
import time
from machine import Pin, I2C
import ssd1306
SCREEN_WIDTH = 128
SCREEN_HEIGHT = 64
#正
UP_PIN = Pin(7, Pin.IN, Pin.PULL_UP)
DOWN_PIN = Pin(2, Pin.IN, Pin.PULL_UP)
LEFT_PIN = Pin(6, Pin.IN, Pin.PULL_UP)
RIGHT_PIN = Pin(5, Pin.IN, Pin.PULL_UP)
# snake config
SNAKE_PIECE_SIZE = 3 # 蛇的每一格占用3*3个像素
MAX_SNAKE_LENGTH = 150 # 蛇的最长长度
MAP_SIZE_X = 41 # 活动范围
MAP_SIZE_Y = 20
START_SNAKE_SIZE = 5 # 初始长度
SNAKE_MOVE_DELAY = 10 # 移动延时
# game config
class State(object):
START = 0
RUNNING = 1
GAMEOVER = 2
@classmethod
def setter(cls, state):
if state == cls.START:
return cls.START
elif state == cls.RUNNING:
return cls.RUNNING
elif state == cls.GAMEOVER:
return cls.GAMEOVER
class Direction(object):
# 注意顺序
UP = 0
LEFT = 1
DOWN = 2
RIGHT = 3
@classmethod
def setter(cls, dirc):
if dirc == cls.UP:
return cls.UP
elif dirc == cls.DOWN:
return cls.DOWN
elif dirc == cls.LEFT:
return cls.LEFT
elif dirc == cls.RIGHT:
return cls.RIGHT
i2c = I2C(0, scl=Pin(0), sda=Pin(1), freq=400000)
#i2c = I2C(0)
screen = ssd1306.SSD1306_I2C(SCREEN_WIDTH, SCREEN_HEIGHT, I2C(0))
screen.rotate(2)
################ Snake 功能实现 ###################
class Snake(object):
def __init__(self):
self.snake = [] # 初始位置[（x1,y1）,(x2,y2),...]一个元组列表
self.fruit = [] # 水果，[x,y]
self.snake_length = START_SNAKE_SIZE
self.direction = Direction.RIGHT # 当前前进方向
self.new_direction = Direction.RIGHT # 用户按键后的前进方向
self.game_state = None
self.display = screen
self.setup_game()
def setup_game(self):
"""初始化游戏"""
self.game_state = State.START
direction = Direction.RIGHT
new_direction = Direction.RIGHT
self.reset_snake()
self.generate_fruit()
self.display.fill(0)
self.draw_map()
#self.show_score()
#self.show_press_to_start()
self.display.show()
def reset_snake(self):
"""重设蛇的位置"""
self.snake = [] # 重置
self.snake_length = START_SNAKE_SIZE
for i in range(self.snake_length):
self.snake.append((MAP_SIZE_X // 2 - i, MAP_SIZE_Y // 2))
def check_fruit(self):
"""检测蛇是否吃到水果，能否继续吃水果"""
if self.snake[0][0] == self.fruit[0] and self.snake[0][1] == self.fruit[1]:
if self.snake_length + 1 < MAX_SNAKE_LENGTH:
self.snake_length += 1
# 吃到水果后，将蛇增加一格
self.snake.insert(0, (self.fruit[0], self.fruit[1]))
self.generate_fruit()
def generate_fruit(self):
"""随机生成水果位置，注意不能生成在蛇身上"""
while True:
self.fruit = [random.randint(1, MAP_SIZE_X - 1), random.randint(1, MAP_SIZE_Y - 1)]
fruit = tuple(self.fruit)
if fruit in self.snake:
# 生成在蛇身上
continue
else:
print('fruit: ', self.fruit)
break
@staticmethod
def button_press():
"""是否有按键按下"""
for pin in UP_PIN, DOWN_PIN, LEFT_PIN, RIGHT_PIN:
if pin.value() == 0: # 低电平表示按下
return True
return False
def read_direction(self):
"""读取新的按键方向，不能与当前方向相反"""
for direction, pin in enumerate((UP_PIN, LEFT_PIN, DOWN_PIN, RIGHT_PIN)):
if pin.value() == 0 and not (direction == (self.direction + 2) % 4):
self.new_direction = Direction.setter(direction)
return
def collection_check(self, x, y):
"""检查蛇社否撞到墙或者（x,y）位置"""
for i in self.snake:
if x == i[0] and y == i[1]:
return True
if x < 0 or y < 0 or x >= MAP_SIZE_X or y >= MAP_SIZE_Y:
return True
return False
def move_snake(self):
"""按照方向键移动蛇，返回能否继续移动的布尔值"""
x, y = self.snake[0]
new_x, new_y = x, y
if self.direction == Direction.UP:
new_y -= 1
elif self.direction == Direction.DOWN:
new_y += 1
elif self.direction == Direction.LEFT:
new_x -= 1
elif self.direction == Direction.RIGHT:
new_x += 1
if self.collection_check(new_x, new_y): # 不能继续移动
return False
self.snake.pop() # 去除最后一个位置
self.snake.insert(0, (new_x, new_y)) # 在开头添加新位置
return True # 能继续移动
def draw_map(self):
"""绘制地图区域: 蛇、水果、边界"""
offset_map_x = SCREEN_WIDTH - SNAKE_PIECE_SIZE * MAP_SIZE_X - 2
offset_map_y = 2
# 绘制水果
self.display.rect(self.fruit[0] * SNAKE_PIECE_SIZE + offset_map_x,
self.fruit[1] * SNAKE_PIECE_SIZE + offset_map_y,
SNAKE_PIECE_SIZE, SNAKE_PIECE_SIZE, 1)
# 绘制地图边界, 边界占一个像素，但是绘制时在内侧留一个像素，当蛇头部到达内部一个像素时，即判定为碰撞
self.display.rect(offset_map_x - 2,
0,
SNAKE_PIECE_SIZE * MAP_SIZE_X + 4,
SNAKE_PIECE_SIZE * MAP_SIZE_Y + 4, 1)
# 绘制蛇
for x, y in self.snake:
self.display.fill_rect(x * SNAKE_PIECE_SIZE + offset_map_x,
y * SNAKE_PIECE_SIZE + offset_map_y,
SNAKE_PIECE_SIZE,
SNAKE_PIECE_SIZE, 1)
def show_score(self):
"""显示得分"""
score = self.snake_length - START_SNAKE_SIZE
self.display.text('Score:%d' % score, 4, 2, 1)
def show_press_to_start(self):
"""提示按任意键开始游戏"""
self.display.text('Press', 4, 40, 1)
self.display.text('any', 60, 40, 1)
self.display.text('Key!', 100, 40, 1)
def show_game_over(self):
"""显示游戏结束"""
self.display.text('Game', 50, 25, 1)
self.display.text('Over!', 50, 35, 1)
################# 循环运行程序 ##################
if __name__ == '__main__':
# print('******** Start ********')
snake = Snake()
move_time = 0
while True:
if snake.game_state == State.START:
if Snake.button_press():
snake.game_state = State.RUNNING
elif snake.game_state == State.RUNNING:
move_time += 1
snake.read_direction()
if move_time >= SNAKE_MOVE_DELAY:
snake.direction = snake.new_direction
snake.display.fill(0)
if not snake.move_snake():
snake.game_state = State.GAMEOVER
snake.show_game_over()
snake.show_score()
#self.show_press_to_start()
time.sleep(1)
snake.draw_map()
#snake.show_score()
snake.display.show()
snake.check_fruit()
move_time = 0
elif snake.game_state == State.GAMEOVER:
if Snake.button_press():
time.sleep_ms(500)
snake.setup_game()
print('******** new game ********')
snake.game_state = State.START
time.sleep_ms(20)
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