Micro:bit two player shooter

main.py

import random

import radio
from microbit import display, Image, button_a, button_b, pin0, running_time


class Utils:
    @staticmethod
    def deepcopy(arr):
        return [row[:] for row in arr]

    @staticmethod
    def build_img(arr):
        result = ""
        for subarr in arr:
            for item in subarr:
                result += str(item)
            result += ":"
        return Image(result)


class Player:
    x = 2
    y = 4
    health = 9
    last_changed = running_time()

    def __init__(self):
        radio.send('EP {}'.format(self.x))

    def allowed_to_move(self):
        return running_time() - self.last_changed > 200

    def act(self, frame: Image):
        if self.allowed_to_move():
            if button_a.is_pressed():
                self.x = max(self.x - 1, 0)
                radio.send("EP {}".format(self.x))
                self.last_changed = running_time()
            elif button_b.is_pressed():
                self.x = min(self.x + 1, 4)
                radio.send("EP {}".format(self.x))
                self.last_changed = running_time()

        frame.set_pixel(self.x, self.y, self.health)
        return frame


class RemotePlayer:
    last_position = None
    health = 9

    def act(self, frame: Image, msg):
        if msg is not None:
            if 'EP' in msg:
                try:
                    self.last_position = int(msg.lstrip('EP').strip())
                except:
                    pass

        if self.last_position is not None:
            frame.set_pixel(self.last_position, 0, self.health)

        return frame


class BulletStorm:
    last_changed = running_time()
    last_shot = running_time()
    player_bullet_positions = []
    enemy_bullet_positions = []

    def __init__(self, player: Player, remote: RemotePlayer):
        self.player = player
        self.remote = remote

    def allowed_to_move(self):
        return running_time() - self.last_changed > 100

    def allowed_to_fire(self):
        return running_time() - self.last_shot > 1000

    def act(self, frame: Image, msg):
        if self.allowed_to_move():
            for bullet in self.player_bullet_positions:
                bullet[1] -= 1
                if bullet[1] == 0 and bullet[0] == self.remote.last_position:
                    self.remote.health -= 1
            for bullet in self.enemy_bullet_positions:
                bullet[1] += 1
                if bullet[1] == 4 and bullet[0] == self.player.x:
                    self.player.health -= 1
            self.last_changed = running_time()

        self.player_bullet_positions = list(filter(lambda position: position[1] >= 0, self.player_bullet_positions))
        self.enemy_bullet_positions = list(filter(lambda position: position[1] < 5, self.enemy_bullet_positions))

        if self.allowed_to_fire():
            radio.send("FR")
            self.player_bullet_positions.append([int(self.player.x), 3])
            self.last_shot = running_time()

        if msg is not None and msg == 'FR' and self.remote.last_position is not None:
            self.enemy_bullet_positions.append([int(self.remote.last_position), 1])

        for bullet in self.player_bullet_positions + self.enemy_bullet_positions:
            frame.set_pixel(bullet[0], bullet[1], 5)

        return frame


empty_frame = [
    [0] * 5,
    [0] * 5,
    [0] * 5,
    [0] * 5,
    [0] * 5,
]

radio.on()
radio.config(data_rate=radio.RATE_2MBIT, length=8)

player = Player()
remote_player = RemotePlayer()
bulletstorm = BulletStorm(player, remote_player)

while True:
    message = radio.receive()
    new_frame = Utils.build_img(empty_frame)
    new_frame = player.act(new_frame)
    new_frame = remote_player.act(new_frame, message)
    new_frame = bulletstorm.act(new_frame, message)

    if player.health < 1 or message == 'won':
        radio.send('lost')
        display.clear()
        display.scroll('You loose!')
        display.show(Image.SAD)
        break

    if remote_player.health < 1 or message == 'lost':
        radio.send('won')
        display.clear()
        display.scroll('You won!')
        display.show(Image.HAPPY)
        break

    display.show(new_frame)

    if pin0.is_touched():
        display.clear()
        break

radio.off()