先頭役が読んだ色を3台で共有する
1台を先頭役にし、その色をほかの2台にも送ります。
- 必要な本体
- 3台。先頭役の上部ライトは緑。
- 線路・準備
- 先頭役に色を読ませるレール。コードからは走行を開始しません。
- 終了方法
- Enterで先頭役の購読を解除し、3台を切断。コードからの停止操作はありません。
- 保存する場所
matrain-python-async/examples/color_change/2_multiple_trains_with_a_leader.py- 実行する場所
matrain-python-asyncフォルダー内。.venvのPythonを使います。
Mac:.venv/bin/python examples/color_change/2_multiple_trains_with_a_leader.pyWindows:.venv\Scripts\python.exe examples\color_change\2_multiple_trains_with_a_leader.py
通常終了の処理を原例のまま掲載しています。例外やCtrl+Cでの停止が保証されないため、異常時は本体のボタンを短く押して止めます。切断だけを停止とみなさないでください。
コード全文
color_change/2_multiple_trains_with_a_leader.py
# Matrain publication modification: licensing/source notice added.
# Executable behavior is unchanged except for the adaptations documented below.
# Source: https://github.com/intelino-code/intelino-trainlib-async-py
# Source commit: 298e1fd4091e069180c30f338b4c285b13accbd0
# This software is made available by Innokind, Inc. DBA Intelino, under the
# terms of the Intelino Public License Agreement, Version 1.0 located at
# https://intelino.com/intelino-public-license. BY INSTALLING, DOWNLOADING,
# ACCESSING, USING OR DISTRIBUTING ANY OF THE SOFTWARE, YOU AGREE TO THE TERMS OF
# SUCH LICENSE AGREEMENT.
"""Color change event example (2): Single leader and multiple follower trains."""
import asyncio
import aioconsole
from typing import List
from intelino.trainlib_async import (
TrainScanner,
Train,
)
from intelino.trainlib_async.messages import (
TrainMsg,
TrainMsgEventFrontColorChanged,
)
async def color_change(leader: Train, followers: List[Train]):
"""
Wait for color change events on the leader train and set
headlights/taillights based on the seen color on all the trains.
"""
def observer_func(msg: TrainMsg):
if isinstance(msg, TrainMsgEventFrontColorChanged):
print(f"New color: {msg.color}")
color = msg.color.to_rgb_bytes()
asyncio.create_task(leader.set_headlight_color(color, color))
for follower in followers:
asyncio.create_task(follower.set_headlight_color(color, color))
# subscribe to the notification stream
subscription = leader.notifications.subscribe(observer_func)
# highlight the leader train
await leader.set_top_led_color(0, 255, 0)
# let the train program run until the 'enter' key is pressed
await aioconsole.ainput("Press <Enter> to exit at any time...\n")
# cleanup
subscription.dispose()
async def main():
# connect to the first 3 trains discovered
trains = await TrainScanner().get_trains(count=3)
# run our train program
await color_change(trains[0], trains[1:])
# after the program finished, disconnect from the trains
for train in trains:
await train.disconnect()
if __name__ == "__main__":
asyncio.run(main())
冒頭に配布条件と出典のコメントを追加しています。表示している全文と、個別保存・ZIP内のこのファイルは同じです。ライセンス・出典を読む
