我想尝试用 Python 编写一个无线乒乓球游戏，我用一个 micro:bit 控制游戏和决定谁得到一分，玩家B是“从机”，只把它的左右移动发给到游戏者A，然后镜显示在玩家A的屏幕上。
怎样玩
使用 Mu 将玩家A的程序写到一个 micro:bit 中，而玩家B使用另外一个 micro:bit 程序。在micro:bit上你可以选择连接耳机或蜂鸣器到micro:bit的引脚0和1获得声音反馈（在newbit上可以直接使用，甚至可以连接震动马达进行力度反馈）。
玩家B先上电 – 它会等待来自玩家A 的消息，然后玩家A上电。接着开始发球，球是屏幕中间移动的LED点。使用A和B按钮左右移动你的球拍，如果挡住球会随机反向反弹，如果没有击中球，对手将得到一分（分数没有显示在屏幕），先得到5分的玩家获胜。开始下一局需要按复位按钮。
工作原理
玩家B比较容易解释。它在一个循环中不断轮询消息和按键。如果你按A键就向左移动，按B向右移动，它会发送一条包含球拍新位置的信息。它也接收来自对手的消息。它们以不同的代码字母开头：
P + A 是玩家A的位置。
X和Y的信息是球的当前位置，然后调用bat_map用字典查表。
a和b消息给出A和B各自的分数。
如果玩家B得到5分，它将退出循环并播放一首快乐的乐曲（Nyan cat）。如果玩家A赢得比赛将播放一首悲伤的歌（葬礼进行曲）。
玩家A做主控端。它为球选择一个随机方向开始移动，如果球碰到任何一个边，它就会反弹。如果它击中了顶部或底部，而玩家没有挡住球，对手就得到一分。我通过delay和计数器计时 – 每达到1000就移动球（我没有找出在microbit上使用MicroPython定时器的方法）。如果一个玩家用球拍击球，速度会加快一点。它发送（如上所述）的球的位置、得分和玩家A球拍位置给给玩家B。游戏的结束方式和玩家B的代码相同，除了玩家A获胜是高兴曲子和玩家B获胜时放悲伤的曲调。
如何修改
通过将延迟参数变小，可以使游戏更快。你也可以通过增加winning_score使游戏时间变长。
一个很好的扩展是添加更多的声音（例如，当你击中球），每当有人赢了一场比赛，等级越高游戏速度就越快。
让我知道你想如何去改进 — 球弹跳的物理方面是我可以帮助的一个领域！
源代码
玩家A所用的代码如下：
# Pongo by @blogmywiki
# player A code - with points
import radio
import random
from microbit import *
from music import play, POWER_UP, JUMP_DOWN, NYAN, FUNERAL
a_bat = 2 # starting position of player A bat
b_bat = 2 # starting position of player B bat
bat_map = {0: 4, 1: 3, 2: 2, 3: 1, 4: 0}
ball_x = 2 # starting position of ball
ball_y = 2
directions = [1, -1] # pick a random direction for ball at start
x_direction = random.choice(directions)
y_direction = random.choice(directions)
delay = 1000 # used as a crude timer
counter = 0 # used as a crude timer
a_points = 0
b_points = 0
winning_score = 5
game_over = False
def move_ball():
global ball_x, ball_y, x_direction, y_direction, counter, a_bat, b_bat, a_points, b_points, delay
display.set_pixel(ball_x, ball_y, 0)
ball_x = ball_x + x_direction
ball_y = ball_y + y_direction
if ball_x < 0: # bounce if hit left wall
ball_x = 0
x_direction = 1
if ball_x > 4: # bounce if hit right wall
ball_x = 4
x_direction = -1
if ball_y == 0:
if ball_x == b_bat: # bounce if player B hit ball
ball_y = 0
y_direction = 1
delay -= 50 # speed up after bat hits
else:
play(POWER_UP, wait=False) # A gets point if B missed ball
a_points += 1
ball_y = 0
y_direction = 1
radio.send('a'+str(a_points)) # transmit points
if ball_y == 4: # bounce if player A hits ball
if ball_x == a_bat:
ball_y = 4
y_direction = -1
delay -= 50 # speed up after bat hits
else:
play(JUMP_DOWN, wait=False) # player B gets point if A misses
b_points += 1
ball_y = 4
y_direction = -1
radio.send('b'+str(b_points))
counter = 0
radio.send('x'+str(ball_x)) # transmit ball position
radio.send('y'+str(ball_y))
radio.on() # like the roadrunner
while not game_over:
counter += 1
display.set_pixel(a_bat, 4, 6) # draw bats
display.set_pixel(b_bat, 0, 6)
display.set_pixel(ball_x, ball_y, 9) # draw ball
if button_a.was_pressed():
display.set_pixel(a_bat, 4, 0)
a_bat = a_bat - 1
if a_bat < 0:
a_bat = 0
radio.send('p'+str(a_bat))
if button_b.was_pressed():
display.set_pixel(a_bat, 4, 0)
a_bat = a_bat + 1
if a_bat > 4:
a_bat = 4
radio.send('p'+str(a_bat))
incoming = radio.receive()
if incoming:
display.set_pixel(b_bat, 0, 0)
b_bat = bat_map[int(incoming)]
if counter == delay:
move_ball()
if a_points == winning_score or b_points == winning_score:
game_over = True
if a_points > b_points:
play(NYAN, wait=False)
display.scroll('A wins!')
else:
play(FUNERAL, wait=False)
display.scroll('B wins!')
display.scroll('Press reset to play again')
玩家B所用的代码如下：
# Pongo by @blogmywiki
# player B code
import radio
from microbit import *
from music import play, POWER_UP, JUMP_DOWN, NYAN, FUNERAL
a_bat = 2 # starting position of player A bat
b_bat = 2 # starting position of player B bat
bat_map = {0: 4, 1: 3, 2: 2, 3: 1, 4: 0}
ball_x = 2 # starting position of ball
ball_y = 2
a_points = 0
b_points = 0
winning_score = 5
game_over = False
radio.on() # like the roadrunner
def parse_message():
global a_bat, incoming, bat_map, ball_x, ball_y, a_points, b_points
msg_type = incoming[:1] # find out what kind of message we have received
msg = incoming[1:] # strip initial letter from message
if msg_type == 'p':
display.set_pixel(a_bat, 0, 0)
their_bat = int(msg) # mirror their bat position
a_bat = bat_map[their_bat]
if msg_type == 'x':
display.set_pixel(ball_x, ball_y, 0)
ball_x = bat_map[int(msg)]
if msg_type == 'y':
display.set_pixel(ball_x, ball_y, 0)
ball_y = bat_map[int(msg)]
if msg_type == 'a':
a_points = int(msg)
play(JUMP_DOWN, wait=False)
if msg_type == 'b':
b_points = int(msg)
play(POWER_UP, wait=False)
while not game_over:
display.set_pixel(b_bat, 4, 6)
display.set_pixel(a_bat, 0, 6)
display.set_pixel(ball_x, ball_y, 9) # draw ball
if button_a.was_pressed():
display.set_pixel(b_bat, 4, 0)
b_bat = b_bat - 1
if b_bat < 0:
b_bat = 0
radio.send(str(b_bat))
if button_b.was_pressed():
display.set_pixel(b_bat, 4, 0)
b_bat = b_bat + 1
if b_bat > 4:
b_bat = 4
radio.send(str(b_bat))
incoming = radio.receive()
if incoming:
parse_message()
if a_points == winning_score or b_points == winning_score:
game_over = True
if a_points < b_points:
play(NYAN, wait=False)
display.scroll('B wins!')
else:
play(FUNERAL, wait=False)
display.scroll('A wins!')
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