Double Pendulum (Flask + Canvas)

This simulation was created to be used as skeleton code as part of Hack Club's Accelerate Program.

Project Structure

• app.py — Flask app, DoublePendulum class, background simulation, routes
• templates/index.html — Canvas animation and polling logic
• requirements.txt — Python dependencies

Quickstart

1) Create & activate a virtual environment (Windows PowerShell)

py -m venv .venv; .\.venv\Scripts\Activate.ps1

2) Install dependencies

pip install -r requirements.txt

3) Run the server

$env:FLASK_APP = "app"
flask run

Then open http://127.0.0.1:5000 in your browser.

Troubleshooting

• If you see ImportErrors, ensure you installed from requirements.txt into the active venv.
• If animation stutters, lower dt, increase poll frequency, or reduce MAX_TRAIL.

License

MIT — see project materials.