From a326108bfbc493f02967c17c024daa4c3455bbc3 Mon Sep 17 00:00:00 2001
From: Alvan Gao <2503206@stu.hdschools.org>
Date: Tue, 23 Jun 2026 07:24:54 +0000
Subject: [PATCH] Upload files to "/"

---
 snake.py | 384 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 384 insertions(+)
 create mode 100644 snake.py

diff --git a/snake.py b/snake.py
new file mode 100644
index 0000000..2ae0440
--- /dev/null
+++ b/snake.py
@@ -0,0 +1,384 @@
+import random
+import pgzrun
+
+# ====================== 全局基础常量 ======================
+WIDTH = 600
+HEIGHT = 600
+GRID = 20
+GRID_NUM_X = WIDTH // GRID
+GRID_NUM_Y = HEIGHT // GRID
+FORBID_RANGE = 10
+
+# 难度配置：Lv1=40，Lv2=30，Lv3=20
+LEVEL_CFG = {
+    1: (8, 40),
+    2: (4, 30),
+    3: (2, 20)
+}
+DEFAULT_LEVEL = 2
+
+# 色块颜色
+BG_COLOR = (0, 0, 0)
+OBSTACLE_COLOR = (139, 69, 19)
+FOOD_FALLBACK_COLOR = (255, 0, 0)
+SNAKE_BODY_COLOR = (0, 0, 255)
+SNAKE_HEAD_COLOR = (0, 255, 0)
+
+# ====================== 全局状态 ======================
+game_state = "menu"
+current_level = DEFAULT_LEVEL
+move_frame_gap = LEVEL_CFG[current_level][0]
+win_length = LEVEL_CFG[current_level][1]
+
+snake = []
+dir_x, dir_y = 1, 0
+next_dir_x, next_dir_y = 1, 0
+frame_count = 0
+
+score = 0
+food_eaten_count = 0
+food_pos = (0, 0)
+food_actor = None
+obstacles = []
+has_revived = False
+bgm_obj = None       # 背景音乐对象
+bgm_playing = False  # BGM播放标记
+
+# 全部音效变量（bgm并入sounds）
+sound_start = None
+sound_eat = None
+sound_revive = None
+sound_gameover = None
+sound_win = None
+
+# ====================== 素材加载 ======================
+def load_resources():
+    global food_actor, bgm_obj, sound_start, sound_eat, sound_revive, sound_gameover, sound_win
+    # 食物图片
+    try:
+        food_actor = Actor("food")
+    except:
+        food_actor = None
+    # 所有音效统一从sounds加载
+    try:
+        bgm_obj = sounds.bgm
+    except Exception as e:
+        print("bgm.wav 加载失败：", e)
+        bgm_obj = None
+    try:
+        sound_start = sounds.start
+    except:
+        sound_start = None
+    try:
+        sound_eat = sounds.eat
+    except:
+        sound_eat = None
+    try:
+        sound_revive = sounds.revive
+    except:
+        sound_revive = None
+    try:
+        sound_gameover = sounds.game_over
+    except:
+        sound_gameover = None
+    try:
+        sound_win = sounds.win
+    except:
+        sound_win = None
+
+# ====================== 统一停止背景音乐函数（修复重叠核心） ======================
+def stop_bgm():
+    global bgm_playing
+    if bgm_obj is not None:
+        bgm_obj.stop()
+    bgm_playing = False
+
+# ====================== 禁区判断 ======================
+def is_in_head_forbid_area(pos):
+    x, y = pos
+    hx, hy = snake[0]
+    if dir_x == 1:
+        if x > hx and (x - hx) <= FORBID_RANGE and abs(y - hy) <= 1:
+            return True
+    elif dir_x == -1:
+        if x < hx and (hx - x) <= FORBID_RANGE and abs(y - hy) <= 1:
+            return True
+    elif dir_y == 1:
+        if y > hy and (y - hy) <= FORBID_RANGE and abs(x - hx) <= 1:
+            return True
+    elif dir_y == -1:
+        if y < hy and (hy - y) <= FORBID_RANGE and abs(x - hx) <= 1:
+            return True
+    return False
+
+# ====================== 游戏工具函数 ======================
+def reset_game():
+    global snake, dir_x, dir_y, next_dir_x, next_dir_y
+    global score, food_eaten_count, obstacles, frame_count, has_revived
+    center_x = GRID_NUM_X // 2
+    center_y = GRID_NUM_Y // 2
+    snake = [(center_x, center_y), (center_x - 1, center_y), (center_x - 2, center_y)]
+    dir_x, dir_y = 1, 0
+    next_dir_x, next_dir_y = 1, 0
+    frame_count = 0
+    score = 0
+    food_eaten_count = 0
+    obstacles.clear()
+    has_revived = False
+    spawn_food()
+
+def revive_player():
+    global snake, dir_x, dir_y, next_dir_x, next_dir_y, frame_count, obstacles, has_revived
+    if sound_revive:
+        sound_revive.play()
+    center_x = GRID_NUM_X // 2
+    center_y = GRID_NUM_Y // 2
+    length = len(snake)
+    snake = []
+    for i in range(length):
+        snake.append((center_x - i, center_y))
+    dir_x, dir_y = 1, 0
+    next_dir_x, next_dir_y = 1, 0
+    frame_count = 0
+    obstacles.clear()
+    has_revived = True
+    spawn_food()
+
+def get_empty_positions():
+    empty = []
+    snake_set = set(snake)
+    obs_set = set(obstacles)
+    for x in range(GRID_NUM_X):
+        for y in range(GRID_NUM_Y):
+            pos = (x, y)
+            if pos not in snake_set and pos not in obs_set and not is_in_head_forbid_area(pos):
+                empty.append(pos)
+    return empty
+
+def spawn_food():
+    global food_pos
+    empty = get_empty_positions()
+    food_pos = random.choice(empty)
+
+def spawn_obstacle_group():
+    empty = get_empty_positions()
+    if len(empty) < 3:
+        return
+    start = random.choice(empty)
+    sx, sy = start
+    shapes = [
+        [(sx, sy), (sx+1, sy), (sx+2, sy)],
+        [(sx, sy), (sx, sy+1), (sx, sy+2)],
+        [(sx, sy), (sx+1, sy), (sx, sy+1)]
+    ]
+    shape = random.choice(shapes)
+    fixed_shape = []
+    for (x, y) in shape:
+        fx = x % GRID_NUM_X
+        fy = y % GRID_NUM_Y
+        fixed_shape.append((fx, fy))
+    snake_set = set(snake)
+    obs_set = set(obstacles)
+    food_set = {food_pos}
+    valid = True
+    for p in fixed_shape:
+        if p in snake_set or p in obs_set or p in food_set or is_in_head_forbid_area(p):
+            valid = False
+            break
+    if valid:
+        obstacles.extend(fixed_shape)
+
+def check_win():
+    return len(snake) >= win_length
+
+# ====================== 游戏更新 ======================
+def update():
+    global game_state, frame_count, dir_x, dir_y, next_dir_x, next_dir_y
+    global score, food_eaten_count, snake, obstacles, bgm_playing
+
+    # 进入游戏界面且未播放BGM时启动，play(-1) = 无限循环
+    if game_state == "play" and not bgm_playing and bgm_obj is not None:
+        bgm_obj.play(-1)
+        bgm_playing = True
+        print("BGM启动成功")
+
+    # 非对局界面跳过逻辑
+    if game_state == "menu" or game_state in ("death_revive", "gameover", "win"):
+        return
+
+    frame_count += 1
+
+    # 禁止反向掉头
+    if not (next_dir_x == -dir_x and next_dir_y == -dir_y):
+        dir_x, dir_y = next_dir_x, next_dir_y
+
+    if frame_count % move_frame_gap != 0:
+        return
+
+    head_x, head_y = snake[0]
+    new_x = (head_x + dir_x) % GRID_NUM_X
+    new_y = (head_y + dir_y) % GRID_NUM_Y
+    new_head = (new_x, new_y)
+
+    # 撞障碍/自身死亡
+    if new_head in snake or new_head in obstacles:
+        if sound_gameover:
+            sound_gameover.play()
+        if not has_revived:
+            game_state = "death_revive"
+        else:
+            game_state = "gameover"
+        return
+
+    # 吃到食物
+    if new_head == food_pos:
+        snake.insert(0, new_head)
+        score += 1
+        food_eaten_count += 1
+        if food_eaten_count % 2 == 0:
+            spawn_obstacle_group()
+        spawn_food()
+        if sound_eat:
+            sound_eat.play()
+        if check_win():
+            game_state = "win"
+            if sound_win:
+                sound_win.play()
+        return
+    snake.insert(0, new_head)
+    snake.pop()
+
+# ====================== 按键控制 ======================
+def on_key_down(key):
+    global game_state, current_level, move_frame_gap, win_length
+    global next_dir_x, next_dir_y
+
+    # ESC退出：先停止BGM再关闭程序
+    if key == keys.ESCAPE:
+        stop_bgm()
+        exit()
+
+    # 难度菜单选关：进入游戏前停止旧BGM
+    if game_state == "menu":
+        if key == keys.K_1:
+            current_level = 1
+        elif key == keys.K_2:
+            current_level = 2
+        elif key == keys.K_3:
+            current_level = 3
+        else:
+            return
+        move_frame_gap, win_length = LEVEL_CFG[current_level]
+        stop_bgm()
+        reset_game()
+        if sound_start:
+            sound_start.play()
+        game_state = "play"
+        return
+
+    # 死亡复活界面
+    if game_state == "death_revive":
+        if key == keys.Q:
+            revive_player()
+            game_state = "play"
+        elif key == keys.R:
+            # 按R重开：先停止BGM再重置
+            stop_bgm()
+            reset_game()
+            if sound_start:
+                sound_start.play()
+            game_state = "play"
+        return
+
+    # 胜利/彻底失败界面按R重开
+    if game_state in ("gameover", "win"):
+        if key == keys.R:
+            # 按R重开：先停止BGM再重置
+            stop_bgm()
+            reset_game()
+            if sound_start:
+                sound_start.play()
+            game_state = "play"
+        return
+
+    # WASD移动
+    if game_state == "play":
+        if key == keys.W:
+            next_dir_x, next_dir_y = 0, -1
+        elif key == keys.S:
+            next_dir_x, next_dir_y = 0, 1
+        elif key == keys.A:
+            next_dir_x, next_dir_y = -1, 0
+        elif key == keys.D:
+            next_dir_x, next_dir_y = 1, 0
+
+# ====================== 绘制 ======================
+def draw():
+    screen.fill(BG_COLOR)
+
+    # 难度菜单文字 40 / 30 / 20
+    if game_state == "menu":
+        screen.draw.text("SNAKE GAME", center=(WIDTH//2, 120), fontsize=48, color="white")
+        screen.draw.text("Press 1 / 2 / 3 to select level", center=(WIDTH//2, 180), fontsize=24, color="gray")
+        screen.draw.text("Level 1: Slow | Target Length 40", center=(WIDTH//2, 230), fontsize=20, color="green")
+        screen.draw.text("Level 2: Normal | Target Length 30 (Default)", center=(WIDTH//2, 270), fontsize=20, color="blue")
+        screen.draw.text("Level 3: Fast | Target Length 20", center=(WIDTH//2, 310), fontsize=20, color="red")
+        screen.draw.text("WASD Move | ESC Quit", center=(WIDTH//2, 400), fontsize=22, color="lightgray")
+        return
+
+    # 绘制障碍物
+    for (x, y) in obstacles:
+        rect = Rect(x * GRID, y * GRID, GRID, GRID)
+        screen.draw.filled_rect(rect, OBSTACLE_COLOR)
+
+    # 绘制食物
+    fx, fy = food_pos
+    food_center_x = fx * GRID + GRID / 2
+    food_center_y = fy * GRID + GRID / 2
+    if food_actor:
+        food_actor.pos = (food_center_x, food_center_y)
+        food_actor.draw()
+    else:
+        food_rect = Rect(fx * GRID, fy * GRID, GRID, GRID)
+        screen.draw.filled_rect(food_rect, FOOD_FALLBACK_COLOR)
+
+    # 绘制蛇身体
+    for idx in range(1, len(snake)):
+        x, y = snake[idx]
+        body_rect = Rect(x * GRID, y * GRID, GRID, GRID)
+        screen.draw.filled_rect(body_rect, SNAKE_BODY_COLOR)
+    # 蛇头
+    hx, hy = snake[0]
+    head_rect = Rect(hx * GRID, hy * GRID, GRID, GRID)
+    screen.draw.filled_rect(head_rect, SNAKE_HEAD_COLOR)
+
+    # 左上角文字信息
+    screen.draw.text(f"Score: {score}", (10, 10), fontsize=20, color="white")
+    screen.draw.text(f"Level: {current_level}", (10, 35), fontsize=20, color="white")
+    screen.draw.text(f"Obstacle Blocks: {len(obstacles)}", (10, 60), fontsize=20, color="lightgray")
+
+    # 死亡复活遮罩
+    if game_state == "death_revive":
+        screen.draw.filled_rect(Rect(0, 0, WIDTH, HEIGHT), (0, 0, 0, 180))
+        screen.draw.text("YOU DIED", center=(WIDTH//2, HEIGHT//2 - 60), fontsize=60, color="orange")
+        screen.draw.text("Press Q to Revive (Keep score & length)", center=(WIDTH//2, HEIGHT//2 - 10), fontsize=22, color="white")
+        screen.draw.text("Press R to Restart Full Game", center=(WIDTH//2, HEIGHT//2 + 30), fontsize=22, color="white")
+        screen.draw.text("ESC to Quit", center=(WIDTH//2, HEIGHT//2 + 70), fontsize=20, color="lightgray")
+
+    # Game Over遮罩
+    if game_state == "gameover":
+        screen.draw.filled_rect(Rect(0, 0, WIDTH, HEIGHT), (0, 0, 0, 180))
+        screen.draw.text("GAME OVER", center=(WIDTH//2, HEIGHT//2 - 40), fontsize=60, color="red")
+        screen.draw.text("R Restart | ESC Quit", center=(WIDTH//2, HEIGHT//2 + 30), fontsize=24, color="white")
+
+    # 胜利遮罩
+    if game_state == "win":
+        screen.draw.filled_rect(Rect(0, 0, WIDTH, HEIGHT), (0, 0, 0, 180))
+        screen.draw.text("YOU WIN!", center=(WIDTH//2, HEIGHT//2 - 50), fontsize=60, color="green")
+        screen.draw.text("All space filled completely!", center=(WIDTH//2, HEIGHT//2 + 10), fontsize=22, color="white")
+        screen.draw.text("R Restart | ESC Quit", center=(WIDTH//2, HEIGHT//2 + 50), fontsize=24, color="white")
+
+# 加载素材
+load_resources()
+# 启动游戏
+pgzrun.go()
\ No newline at end of file