写一个基于pygamezero的俄罗斯方块小游戏代码

下面是一个基于 Pygame Zero 的俄罗斯方块小游戏的代码示例：

from random import choice
from pygame import Rect
import pgzrun

WIDTH = 300
HEIGHT = 600
CELL_SIZE = 30
CELL_MARGIN = 1
BOARD_WIDTH = 10
BOARD_HEIGHT = 20
BOARD_TOP = 50
SCOREBOARD_HEIGHT = 50

# 定义几种形状
SHAPES = {
    'I': [(0, 0), (0, 1), (0, 2), (0, 3)],
    'J': [(1, 0), (1, 1), (1, 2), (0, 2)],
    'L': [(0, 0), (0, 1), (0, 2), (1, 2)],
    'O': [(0, 0), (0, 1), (1, 0), (1, 1)],
    'S': [(1, 0), (0, 1), (1, 1), (0, 2)],
    'T': [(0, 0), (1, 0), (2, 0), (1, 1)],
    'Z': [(0, 0), (1, 0), (1, 1), (2, 1)]
}

# 定义一些颜色
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
GRAY = (128, 128, 128)
RED = (255, 0, 0)
GREEN = (0, 255, 0)
BLUE = (0, 0, 255)
YELLOW = (255, 255, 0)
CYAN = (0, 255, 255)
MAGENTA = (255, 0, 255)

# 初始化游戏状态
board = [[None] * BOARD_WIDTH for _ in range(BOARD_HEIGHT)]
score = 0
next_shape = choice(list(SHAPES.keys()))
current_shape = None
current_shape_position = None

# 生成一个新的形状
def new_shape():
    global next_shape, current_shape, current_shape_position
    current_shape = next_shape
    current_shape_position = [BOARD_WIDTH // 2 - 2, 0]
    next_shape = choice(list(SHAPES.keys()))

# 检查当前形状是否可放置
def is_valid_position():
    for x, y in current_shape:
        if x + current_shape_position[0] < 0 or \
                x + current_shape_position[0] >= BOARD_WIDTH or \
                y + current_shape_position[1] >= BOARD_HEIGHT or \
                board[y + current_shape_position[1]][x + current_shape_position[0]] != None:
            return False
    return True

# 添加当前形状到游戏板上
def add_shape_to_board():
    for x, y in current_shape:
        board[y + current_shape_position[1]][x + current_shape_position[0]] = current_shape

# 删除已满的行并计算分数
def remove_full_rows():
    global score
    rows_removed = 0
    for y in range(BOARD_HEIGHT - 1, -1, -1):
        if None not in board[y]:
            rows_removed += 1
            del board[y]
            board.insert(0, [None] * BOARD_WIDTH)
    score += rows_removed ** 2

# 检查游戏是否结束
def is_game_over():
    return any(cell != None for cell in board[0])

# 处理游戏逻辑
def update():
    global current_shape_position
    if current_shape == None:
        new_shape()
    else:
        current_shape_position[1] += 1
        if not is_valid_position():
            current_shape_position[1] -= 1
            add_shape_to_board()
            remove_full_rows()
            if is_game_over():
                quit()
            new_shape()

# 绘制游戏界面
def draw():
    # 绘制背景
    screen.fill(BLACK)
    # 绘制游戏板
    for y in range(BOARD_HEIGHT):
        for x in range(BOARD_WIDTH):
            cell = board[y][x]
            if cell != None:
                pygame.draw.rect(screen, cell[1], Rect(x * (CELL_SIZE + CELL_MARGIN), BOARD_TOP + y * (CELL_SIZE + CELL_MARGIN), CELL_SIZE, CELL_SIZE))
    # 绘制当前形状
    if current_shape != None:
        for x, y in current_shape:
            pygame.draw.rect(screen, current_shape[1], Rect((current_shape_position[0] + x) * (CELL_SIZE + CELL_MARGIN), BOARD_TOP + (current_shape_position[1] + y) * (CELL_SIZE + CELL_MARGIN), CELL_SIZE, CELL_SIZE))
    # 绘制预览区域下一个形状
    for x, y in SHAPES[next_shape]:
        pygame.draw.rect(screen, GRAY, Rect(BOARD_WIDTH * (CELL_SIZE + CELL_MARGIN) + x * (CELL_SIZE + CELL_MARGIN), 100 + y * (CELL_SIZE + CELL_MARGIN), CELL_SIZE, CELL_SIZE))
    # 绘制分数
    screen.draw.text('Score: %d' % score, (10, 10), color=WHITE)
    # 绘制游戏结束信息
    if is_game_over():
        screen.draw.text('Game Over', (WIDTH // 2 - 50, HEIGHT // 2), color=RED)

pgzrun.go()

在这个游戏中，玩家需要控制下落的俄罗斯方块，使其在游戏板上形成完整的一行，这样就可以消除该行并得分。如果方块堆积过高，游戏就结束了。这个游戏使用 Pygame Zero 构建，它提供了一些简单的绘图和事件处理功能，使得开发 2D 游戏变得非常容易。