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snake.py
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384
snake.py
Normal file
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import random
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import pgzrun
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# ====================== 全局基础常量 ======================
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WIDTH = 600
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HEIGHT = 600
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GRID = 20
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GRID_NUM_X = WIDTH // GRID
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GRID_NUM_Y = HEIGHT // GRID
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FORBID_RANGE = 10
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# 难度配置：Lv1=40，Lv2=30，Lv3=20
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LEVEL_CFG = {
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1: (8, 40),
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2: (4, 30),
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3: (2, 20)
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}
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DEFAULT_LEVEL = 2
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# 色块颜色
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BG_COLOR = (0, 0, 0)
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OBSTACLE_COLOR = (139, 69, 19)
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FOOD_FALLBACK_COLOR = (255, 0, 0)
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SNAKE_BODY_COLOR = (0, 0, 255)
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SNAKE_HEAD_COLOR = (0, 255, 0)
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# ====================== 全局状态 ======================
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game_state = "menu"
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current_level = DEFAULT_LEVEL
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move_frame_gap = LEVEL_CFG[current_level][0]
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win_length = LEVEL_CFG[current_level][1]
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snake = []
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dir_x, dir_y = 1, 0
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next_dir_x, next_dir_y = 1, 0
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frame_count = 0
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score = 0
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food_eaten_count = 0
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food_pos = (0, 0)
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food_actor = None
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obstacles = []
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has_revived = False
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bgm_obj = None # 背景音乐对象
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bgm_playing = False # BGM播放标记
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# 全部音效变量（bgm并入sounds）
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sound_start = None
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sound_eat = None
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sound_revive = None
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sound_gameover = None
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sound_win = None
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# ====================== 素材加载 ======================
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def load_resources():
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global food_actor, bgm_obj, sound_start, sound_eat, sound_revive, sound_gameover, sound_win
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# 食物图片
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try:
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food_actor = Actor("food")
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except:
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food_actor = None
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# 所有音效统一从sounds加载
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try:
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bgm_obj = sounds.bgm
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except Exception as e:
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print("bgm.wav 加载失败：", e)
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bgm_obj = None
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try:
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sound_start = sounds.start
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except:
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sound_start = None
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try:
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sound_eat = sounds.eat
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except:
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sound_eat = None
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try:
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sound_revive = sounds.revive
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except:
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sound_revive = None
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try:
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sound_gameover = sounds.game_over
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except:
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sound_gameover = None
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try:
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sound_win = sounds.win
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except:
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sound_win = None
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# ====================== 统一停止背景音乐函数（修复重叠核心） ======================
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def stop_bgm():
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global bgm_playing
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if bgm_obj is not None:
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bgm_obj.stop()
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bgm_playing = False
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# ====================== 禁区判断 ======================
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def is_in_head_forbid_area(pos):
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x, y = pos
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hx, hy = snake[0]
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if dir_x == 1:
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if x > hx and (x - hx) <= FORBID_RANGE and abs(y - hy) <= 1:
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return True
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elif dir_x == -1:
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if x < hx and (hx - x) <= FORBID_RANGE and abs(y - hy) <= 1:
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return True
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elif dir_y == 1:
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if y > hy and (y - hy) <= FORBID_RANGE and abs(x - hx) <= 1:
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return True
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elif dir_y == -1:
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if y < hy and (hy - y) <= FORBID_RANGE and abs(x - hx) <= 1:
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return True
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return False
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# ====================== 游戏工具函数 ======================
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def reset_game():
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global snake, dir_x, dir_y, next_dir_x, next_dir_y
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global score, food_eaten_count, obstacles, frame_count, has_revived
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center_x = GRID_NUM_X // 2
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center_y = GRID_NUM_Y // 2
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snake = [(center_x, center_y), (center_x - 1, center_y), (center_x - 2, center_y)]
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dir_x, dir_y = 1, 0
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next_dir_x, next_dir_y = 1, 0
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frame_count = 0
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score = 0
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food_eaten_count = 0
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obstacles.clear()
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has_revived = False
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spawn_food()
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def revive_player():
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global snake, dir_x, dir_y, next_dir_x, next_dir_y, frame_count, obstacles, has_revived
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if sound_revive:
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sound_revive.play()
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center_x = GRID_NUM_X // 2
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center_y = GRID_NUM_Y // 2
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length = len(snake)
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snake = []
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for i in range(length):
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snake.append((center_x - i, center_y))
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dir_x, dir_y = 1, 0
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next_dir_x, next_dir_y = 1, 0
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frame_count = 0
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obstacles.clear()
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has_revived = True
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spawn_food()
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def get_empty_positions():
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empty = []
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snake_set = set(snake)
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obs_set = set(obstacles)
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for x in range(GRID_NUM_X):
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for y in range(GRID_NUM_Y):
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pos = (x, y)
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if pos not in snake_set and pos not in obs_set and not is_in_head_forbid_area(pos):
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empty.append(pos)
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return empty
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def spawn_food():
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global food_pos
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empty = get_empty_positions()
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food_pos = random.choice(empty)
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def spawn_obstacle_group():
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empty = get_empty_positions()
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if len(empty) < 3:
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return
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start = random.choice(empty)
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sx, sy = start
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shapes = [
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[(sx, sy), (sx+1, sy), (sx+2, sy)],
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[(sx, sy), (sx, sy+1), (sx, sy+2)],
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[(sx, sy), (sx+1, sy), (sx, sy+1)]
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]
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shape = random.choice(shapes)
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fixed_shape = []
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for (x, y) in shape:
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fx = x % GRID_NUM_X
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fy = y % GRID_NUM_Y
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fixed_shape.append((fx, fy))
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snake_set = set(snake)
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obs_set = set(obstacles)
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food_set = {food_pos}
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valid = True
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for p in fixed_shape:
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if p in snake_set or p in obs_set or p in food_set or is_in_head_forbid_area(p):
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valid = False
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break
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if valid:
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obstacles.extend(fixed_shape)
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def check_win():
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return len(snake) >= win_length
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# ====================== 游戏更新 ======================
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def update():
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global game_state, frame_count, dir_x, dir_y, next_dir_x, next_dir_y
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global score, food_eaten_count, snake, obstacles, bgm_playing
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# 进入游戏界面且未播放BGM时启动，play(-1) = 无限循环
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if game_state == "play" and not bgm_playing and bgm_obj is not None:
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bgm_obj.play(-1)
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bgm_playing = True
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print("BGM启动成功")
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# 非对局界面跳过逻辑
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if game_state == "menu" or game_state in ("death_revive", "gameover", "win"):
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return
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frame_count += 1
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# 禁止反向掉头
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if not (next_dir_x == -dir_x and next_dir_y == -dir_y):
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dir_x, dir_y = next_dir_x, next_dir_y
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if frame_count % move_frame_gap != 0:
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return
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head_x, head_y = snake[0]
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new_x = (head_x + dir_x) % GRID_NUM_X
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new_y = (head_y + dir_y) % GRID_NUM_Y
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new_head = (new_x, new_y)
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# 撞障碍/自身死亡
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if new_head in snake or new_head in obstacles:
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if sound_gameover:
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sound_gameover.play()
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if not has_revived:
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game_state = "death_revive"
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else:
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game_state = "gameover"
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return
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# 吃到食物
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if new_head == food_pos:
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snake.insert(0, new_head)
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score += 1
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food_eaten_count += 1
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if food_eaten_count % 2 == 0:
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spawn_obstacle_group()
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spawn_food()
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if sound_eat:
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sound_eat.play()
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if check_win():
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game_state = "win"
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if sound_win:
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sound_win.play()
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return
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snake.insert(0, new_head)
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snake.pop()
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# ====================== 按键控制 ======================
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def on_key_down(key):
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global game_state, current_level, move_frame_gap, win_length
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global next_dir_x, next_dir_y
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# ESC退出：先停止BGM再关闭程序
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if key == keys.ESCAPE:
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stop_bgm()
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exit()
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# 难度菜单选关：进入游戏前停止旧BGM
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if game_state == "menu":
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if key == keys.K_1:
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current_level = 1
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elif key == keys.K_2:
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current_level = 2
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elif key == keys.K_3:
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current_level = 3
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else:
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return
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move_frame_gap, win_length = LEVEL_CFG[current_level]
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stop_bgm()
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reset_game()
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if sound_start:
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sound_start.play()
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game_state = "play"
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return
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# 死亡复活界面
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if game_state == "death_revive":
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if key == keys.Q:
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revive_player()
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game_state = "play"
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elif key == keys.R:
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# 按R重开：先停止BGM再重置
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stop_bgm()
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reset_game()
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if sound_start:
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sound_start.play()
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game_state = "play"
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return
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# 胜利/彻底失败界面按R重开
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if game_state in ("gameover", "win"):
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if key == keys.R:
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# 按R重开：先停止BGM再重置
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stop_bgm()
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reset_game()
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if sound_start:
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sound_start.play()
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game_state = "play"
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return
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# WASD移动
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if game_state == "play":
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if key == keys.W:
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next_dir_x, next_dir_y = 0, -1
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elif key == keys.S:
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next_dir_x, next_dir_y = 0, 1
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elif key == keys.A:
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next_dir_x, next_dir_y = -1, 0
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elif key == keys.D:
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next_dir_x, next_dir_y = 1, 0
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# ====================== 绘制 ======================
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def draw():
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screen.fill(BG_COLOR)
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# 难度菜单文字 40 / 30 / 20
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if game_state == "menu":
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screen.draw.text("SNAKE GAME", center=(WIDTH//2, 120), fontsize=48, color="white")
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screen.draw.text("Press 1 / 2 / 3 to select level", center=(WIDTH//2, 180), fontsize=24, color="gray")
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screen.draw.text("Level 1: Slow | Target Length 40", center=(WIDTH//2, 230), fontsize=20, color="green")
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screen.draw.text("Level 2: Normal | Target Length 30 (Default)", center=(WIDTH//2, 270), fontsize=20, color="blue")
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screen.draw.text("Level 3: Fast | Target Length 20", center=(WIDTH//2, 310), fontsize=20, color="red")
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screen.draw.text("WASD Move | ESC Quit", center=(WIDTH//2, 400), fontsize=22, color="lightgray")
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return
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# 绘制障碍物
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for (x, y) in obstacles:
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rect = Rect(x * GRID, y * GRID, GRID, GRID)
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screen.draw.filled_rect(rect, OBSTACLE_COLOR)
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# 绘制食物
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fx, fy = food_pos
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food_center_x = fx * GRID + GRID / 2
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food_center_y = fy * GRID + GRID / 2
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if food_actor:
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food_actor.pos = (food_center_x, food_center_y)
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food_actor.draw()
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else:
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food_rect = Rect(fx * GRID, fy * GRID, GRID, GRID)
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screen.draw.filled_rect(food_rect, FOOD_FALLBACK_COLOR)
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# 绘制蛇身体
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for idx in range(1, len(snake)):
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x, y = snake[idx]
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body_rect = Rect(x * GRID, y * GRID, GRID, GRID)
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screen.draw.filled_rect(body_rect, SNAKE_BODY_COLOR)
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# 蛇头
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hx, hy = snake[0]
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head_rect = Rect(hx * GRID, hy * GRID, GRID, GRID)
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screen.draw.filled_rect(head_rect, SNAKE_HEAD_COLOR)
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# 左上角文字信息
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screen.draw.text(f"Score: {score}", (10, 10), fontsize=20, color="white")
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screen.draw.text(f"Level: {current_level}", (10, 35), fontsize=20, color="white")
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screen.draw.text(f"Obstacle Blocks: {len(obstacles)}", (10, 60), fontsize=20, color="lightgray")
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# 死亡复活遮罩
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if game_state == "death_revive":
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screen.draw.filled_rect(Rect(0, 0, WIDTH, HEIGHT), (0, 0, 0, 180))
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screen.draw.text("YOU DIED", center=(WIDTH//2, HEIGHT//2 - 60), fontsize=60, color="orange")
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screen.draw.text("Press Q to Revive (Keep score & length)", center=(WIDTH//2, HEIGHT//2 - 10), fontsize=22, color="white")
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screen.draw.text("Press R to Restart Full Game", center=(WIDTH//2, HEIGHT//2 + 30), fontsize=22, color="white")
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screen.draw.text("ESC to Quit", center=(WIDTH//2, HEIGHT//2 + 70), fontsize=20, color="lightgray")
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# Game Over遮罩
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if game_state == "gameover":
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screen.draw.filled_rect(Rect(0, 0, WIDTH, HEIGHT), (0, 0, 0, 180))
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screen.draw.text("GAME OVER", center=(WIDTH//2, HEIGHT//2 - 40), fontsize=60, color="red")
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screen.draw.text("R Restart | ESC Quit", center=(WIDTH//2, HEIGHT//2 + 30), fontsize=24, color="white")
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# 胜利遮罩
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if game_state == "win":
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screen.draw.filled_rect(Rect(0, 0, WIDTH, HEIGHT), (0, 0, 0, 180))
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screen.draw.text("YOU WIN!", center=(WIDTH//2, HEIGHT//2 - 50), fontsize=60, color="green")
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screen.draw.text("All space filled completely!", center=(WIDTH//2, HEIGHT//2 + 10), fontsize=22, color="white")
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screen.draw.text("R Restart | ESC Quit", center=(WIDTH//2, HEIGHT//2 + 50), fontsize=24, color="white")
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# 加载素材
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load_resources()
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# 启动游戏
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pgzrun.go()
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