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FoamyGuyFoamyGuy
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metro rp2350 snake game
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‎Metro/Metro_RP2350_Snake/code.py

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# SPDX-FileCopyrightText: 2025 Tim Cocks for Adafruit Industries
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# SPDX-License-Identifier: MIT
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import sys
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import time
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from micropython import const
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import supervisor
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import displayio
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import terminalio
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from adafruit_display_text.text_box import TextBox
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from snake_helpers import World, Snake, GameOverException, SpeedAdjuster
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# state machine constant
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STATE_TITLE = const(0)
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STATE_PLAYING = const(1)
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STATE_PAUSED = const(2)
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STATE_GAME_OVER = const(3)
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# begin in the title state
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CURRENT_STATE = STATE_TITLE
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# movement key bindings, change to different letters if you want.
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KEY_UP = "w"
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KEY_LEFT = "a"
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KEY_DOWN = "s"
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KEY_RIGHT = "d"
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KEY_PAUSE = "t"
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# how many segments the snake will start with
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INITIAL_SNAKE_LEN = 3
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# variable for the players score
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score = 0
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# default HSTX display gets initialized by default by circuitpython
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display = supervisor.runtime.display
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# load title splash screen bitmap
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title_bmp = displayio.OnDiskBitmap("snake_splash.bmp")
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# create a tilegrid for the title splash screen
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title_tg = displayio.TileGrid(bitmap=title_bmp, pixel_shader=title_bmp.pixel_shader)
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instructions_txt = TextBox(
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terminalio.FONT,
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text=f"Move: {KEY_UP}{KEY_LEFT}{KEY_DOWN}{KEY_RIGHT} Pause: {KEY_PAUSE}".upper(),
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width=title_bmp.width,
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height=16,
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align=TextBox.ALIGN_CENTER,
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)
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instructions_txt.anchor_point = (0, 0)
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instructions_txt.anchored_position = (0, title_bmp.height + 1)
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# create a group for the title splash screen and put it in the center of the display
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title_group = displayio.Group()
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title_group.append(title_tg)
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title_group.append(instructions_txt)
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title_group.x = display.width // 2 - title_bmp.width // 2
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title_group.y = display.height // 2 - title_bmp.height // 2
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# initialize SpeedAdjuster to control how fast the snake is moving
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speed_adjuster = SpeedAdjuster(12)
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# initialize the world with enough room unused at the top for the score bar
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world = World(height=28, width=40)
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# move the world down to make room for the score bar
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world.y = 16
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# initialize a Snake instance and grow it to the appropriate size
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snake = Snake(starting_location=[10, 10])
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for i in range(INITIAL_SNAKE_LEN - 1):
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snake.grow()
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# add one of each type of apple to the world
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world.add_apple(snake=snake, apple_sprite_index=World.APPLE_RED_SPRITE_INDEX)
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world.add_apple(snake=snake, apple_sprite_index=World.APPLE_GREEN_SPRITE_INDEX)
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# create a group to hold everything for the game
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game_group = displayio.Group()
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# add the world to the game group
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game_group.append(world)
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# create TextBox to hold the score in a bar at the top of the display
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score_txt = TextBox(
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terminalio.FONT, text=f"Score: {score}", color=0xFFFFFF, width=320, height=16
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)
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score_txt.anchor_point = (0, 0)
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score_txt.anchored_position = (0, 2)
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# add the score text to the game group
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game_group.append(score_txt)
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# create a TextBox to hold the game over message
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game_over_label = TextBox(
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terminalio.FONT,
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text="",
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color=0xFFFFFF,
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background_color=0x000000,
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width=display.width // 2,
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height=80,
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align=TextBox.ALIGN_CENTER,
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)
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# move it to the center of the display
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game_over_label.anchor_point = (0, 0)
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game_over_label.anchored_position = (
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display.width // 2 - game_over_label.width // 2,
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40,
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)
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# make it hidden, we'll show it when the game is over.
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game_over_label.hidden = True
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# add it to the game group
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game_group.append(game_over_label)
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# set the title group to show on the display
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display.root_group = title_group
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# draw the snake in it's starting location
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world.draw_snake(snake)
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# timpstamp of the game step render
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prev_step_time = time.monotonic()
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# variable to hold string read from the keyboard to get button presses
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cur_btn_val = None
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while True:
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# current timestamp
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now = time.monotonic()
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# check if there is any keyboard input
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available = supervisor.runtime.serial_bytes_available
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# if there is some keyboard input
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if available:
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# read it into cur_btn_val
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cur_btn_val = sys.stdin.read(available)
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else: # no keyboard input
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# set to None to clear out previous value
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cur_btn_val = None
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# if the current state is title screen
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if CURRENT_STATE == STATE_TITLE:
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# if any button was pressed
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if cur_btn_val is not None:
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# set the visible group on the display to the game group
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display.root_group = game_group
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# update the current state to playing
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CURRENT_STATE = STATE_PLAYING
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# if game is being played
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elif CURRENT_STATE == STATE_PLAYING:
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# if up button was pressed
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if cur_btn_val == KEY_UP:
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# if the snake is not already moving up or down
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if snake.direction not in (snake.DIRECTION_DOWN, snake.DIRECTION_UP):
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# change the direction to up
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snake.direction = snake.DIRECTION_UP
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# if down button was pressed
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if cur_btn_val == KEY_DOWN:
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# if the snake is not already moving up or down
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if snake.direction not in (snake.DIRECTION_DOWN, snake.DIRECTION_UP):
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# change the direction to down
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snake.direction = snake.DIRECTION_DOWN
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# if right button was pressed
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if cur_btn_val == KEY_RIGHT:
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# if the snake is not already moving left or right
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if snake.direction not in (snake.DIRECTION_LEFT, snake.DIRECTION_RIGHT):
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# change the direction to right
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snake.direction = snake.DIRECTION_RIGHT
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# if left button was pressed
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if cur_btn_val == KEY_LEFT:
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# if the snake is not already moving left or right
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if snake.direction not in (snake.DIRECTION_LEFT, snake.DIRECTION_RIGHT):
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# change direction to left
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snake.direction = snake.DIRECTION_LEFT
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# if the pause button was pressed
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if cur_btn_val == KEY_PAUSE:
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# change the state to paused
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CURRENT_STATE = STATE_PAUSED
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# if it's time to render a step of the game
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if now >= prev_step_time + speed_adjuster.delay:
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try:
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# move the snake in the direction it's going
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result = world.move_snake(snake)
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# if a red apple was eaten
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if result == World.APPLE_RED_SPRITE_INDEX:
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# decrease the speed to slow down movement
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speed_adjuster.decrease_speed()
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# award score based on current speed and snake size
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score += ((20 - speed_adjuster.speed) // 3) + snake.size
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# update the score text in the top bar
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score_txt.text = f"Score: {score}"
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# if a green apple was eaten
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elif result == World.APPLE_GREEN_SPRITE_INDEX:
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# increase the speed to speed up movement
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speed_adjuster.increase_speed()
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# award score based on current speed and snake
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# size plus bonus points for green apple
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score += ((20 - speed_adjuster.speed) // 3) + 3 + snake.size
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# update the score text in the top bar
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score_txt.text = f"Score: {score}"
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# if the game is over due to snake running into the edge or itself
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except GameOverException as e:
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# update the game over message with the score
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output_str = (
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f"Game Over\nScore: {score}\nPress P to play again\nPress Q to quit"
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)
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# set the message into the game over label
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game_over_label.text = output_str
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# make the game over label visible
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game_over_label.hidden = False
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# update the state to game over
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CURRENT_STATE = STATE_GAME_OVER
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# store the timestamp to compare with next iteration
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prev_step_time = now
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# if the game is paused
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elif CURRENT_STATE == STATE_PAUSED:
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# if the pause button was pressed
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if cur_btn_val == KEY_PAUSE:
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# change the state to playing so the game resumes
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CURRENT_STATE = STATE_PLAYING
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# if the current state is game over
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elif CURRENT_STATE == STATE_GAME_OVER:
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# if the p button is pressed for play again
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if cur_btn_val == "p":
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# set next code file to this one
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supervisor.set_next_code_file(__file__)
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# reload
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supervisor.reload()
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# if the q button is pressed for exit
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if cur_btn_val == "q":
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# break out of main while True loop.
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break

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