Pendulums simulation

This repo now includes a small, reproducible Python package pendulums (single + double pendulum) with:

• SciPy integration (solve_ivp, energy drift monitoring)
• OpenCV rendering to MP4/WebM/AVI
• optional GIF output via imageio + pillow

Quick start (uv)

Demo output:

Install dependencies:

uv sync

Optional GIF dependencies:

uv sync --extra gif

Run double pendulum (MP4):

uv run pendulums --model double --preset chaotic --duration 10 --fps 60 --size 1080 --out out.mp4

Run single pendulum:

uv run pendulums --model single --preset calm --duration 10 --fps 60 --size 1080 --out single.mp4

GIF (requires --extra gif):

uv run pendulums --model double --preset chaotic --duration 8 --fps 60 --size 720 --out out.gif

Notes

• If .webm export fails, your OpenCV build may lack the needed codec; .mp4 is the default recommendation.
• Legacy demo files were moved into legacy/ (old matplotlib-based renderer and RK4).