### Python 编写的贪吃蛇游戏源码示例 #### 初始化模块和导入库 为了创建一个完整的贪吃蛇游戏，首先需要引入必要的库并设置基本参数。 ```python import pygame from random import randint # 定义颜色常量 black = (0, 0, 0) white = (255, 255, 255) # 设置屏幕尺寸和其他全局变量 SCREEN_WIDTH = 800 SCREEN_HEIGHT = 600 line_width = 1 ``` #### 地图类定义 地图对象用于管理游戏区域内的边界条件以及食物的生成逻辑。 ```python class Map(): def __init__(self, size=(SCREEN_WIDTH//20, SCREEN_HEIGHT//20)): self.size = size # 绘制网格线 def draw_grid(self, screen): for y in range(0, SCREEN_HEIGHT, 20): pygame.draw.line(screen, black, (0, y), (SCREEN_WIDTH, y), line_width) for x in range(0, SCREEN_WIDTH, 20): pygame.draw.line(screen, black, (x, 0), (x, SCREEN_HEIGHT), line_width) ``` #### 蛇类实现 根据描述，蛇主要由头部`__head`和身体列表`__body`构成。这里实现了蛇的基础属性及其移动方法。 ```python class Snake(): def __init__(self, map: Map): # 初始位置远离边缘以防撞墙 self.__head = [randint(3, map.size[0]-5)*20, randint(3,map.size[1]-5)*20] directions = [(0,-20),(0,20),(-20,0),(20,0)] self.__direction = directions[randint(0, 3)] self.__body = [] def move(self): new_head_pos = list(map(lambda i,j:i+j, self.__head,self.__direction)) self.__body.insert(0,list(self.__head)) self.__head=new_head_pos def grow(self): if not self.__body or self.__body[-1]!=list(self.__head): self.__body.append(list(self.__head)) def get_body_positions(self): return [tuple(pos) for pos in reversed([self.__head]+self.__body)] def change_direction(self,direction): opposite_dir={(0,-20):(0,20), (0,20):(0,-20), (-20,0):(20,0), (20,0):(-20,0)} if direction !=opposite_dir.get(tuple(self.__direction)): self.__direction=direction def check_collision_with_self(self)->bool: return tuple(self.__head)in set(self.get_body_positions())-{tuple(self.__head)} def main(): pygame.init() clock = pygame.time.Clock() game_map = Map() snake = Snake(game_map) food_position=[randint(0,(game_map.size[0])-1)*20, randint(0,(game_map.size[1])-1)*20] running=True while running: screen.fill(white) game_map.draw_grid(screen) for event in pygame.event.get(): if event.type==pygame.QUIT: running=False elif event.type == pygame.KEYDOWN: key_to_direction={ pygame.K_UP:(0,-20), pygame.K_DOWN:(0,20), pygame.K_LEFT:(-20,0), pygame.K_RIGHT:(20,0) } snake.change_direction(key_to_direction.get(event.key,(0,0))) snake.move() if snake.check_collision_with_self(): break if tuple(snake._Snake__head)==tuple(food_position): snake.grow() food_position=[randint(0,(game_map.size[0])-1)*20, randint(0,(game_map.size[1])-1)*20] body_positions=snake.get_body_positions() for position in body_positions: pygame.draw.rect(screen,black,pymunk.pygame_util.from_pygame(*position,20,20)) pygame.display.flip() clock.tick(10) if __name__=="__main__": try: main() finally: pygame.quit() ``` 此代码片段展示了如何构建一个简单的基于PyGame框架下的贪吃蛇游戏[^1]。通过上述代码可以观察到，程序不仅包含了蛇体结构的设计还涵盖了碰撞检测机制、键盘事件处理等内容。