coordination-oru 0.4.0

Python port of coordination_oru: a multi-robot trajectory-envelope coordinator.

coordination-oru (Python)

A Python port of coordination_oru, the trajectory-envelope multi-robot coordinator from Pecora et al., A loosely-coupled approach for multi-robot coordination, motion planning and control, ICAPS 2018.

This port targets production use. The ROS layer, OMPL motion planner, and visualization are explicitly out of scope — the framework is loosely coupled, so paths are supplied externally.

Why Python?

Java original	Python replacement	Notes
JTS (vividsolutions)	shapely 2.x (GEOS)	GEOS is a direct C++ port of JTS — same semantics.
JGraphT	networkx	Near 1:1 graph API.
meta-csp APSPSolver	numpy Floyd-Warshall	~20 lines.
meta-csp Allen / Bounds	thin custom layer	~50 lines, 13 relation types.
meta-csp TrajectoryEnvelope	custom port	dataclasses + shapely.
Java threads	asyncio Tasks + Queues	Cleaner cancellation and fan-in.
Swing/AWT	deferred (matplotlib/pygame)	Visualization is a future stage.

We port only the meta-csp surface that coordination_oru actually exercises at runtime: the STP solver, Allen relations, and the trajectory-envelope plumbing. The general meta-CSP search engine, Boolean CSP solver, and timeline planner are dropped.

Install

pip install -e .[dev]

Examples

Each example is a standalone script — run it directly with Python. With the viz extra installed (pip install -e .[viz]) it opens an animated pyglet viewer; without it, it runs headless and prints per-robot progress.

python examples/two_robots.py

Every example also accepts a viewer flag — no per-script setup needed:

python examples/two_robots.py --web-viewer   # browser-based viewer
python examples/two_robots.py --pyglet       # force the pyglet window
python examples/two_robots.py --headless     # force the text-only run

--web-viewer serves a Vite + React frontend on http://127.0.0.1:8723/ (--port to change, --no-browser to not auto-open) with live paths, swept envelopes, critical-section highlights, footprints, zoom/pan, and dark mode. PyPI wheels ship the frontend prebuilt; in a source checkout build it once with npm --prefix frontend install && npm --prefix frontend run build.

Script	Scenario
examples/two_robots.py	Two RK4 robots cross at the origin; one yields at the intersection.
examples/three_robots.py	Three RK4 robots through one intersection, deadlock-free.
examples/three_robots_oldpath.py	The original Java repo's debug1/2/3.path recorded paths.
examples/convoy.py	Convoy following: a yielder trails the leader inside a shared corridor.
examples/dynamic_missions.py	Robots get new missions after finishing their first ones.

Run the tests

pytest

License

GNU General Public License v3.0 or later — see LICENSE. The original Java coordination_oru is GPL-3.0, so this port keeps the same licence.

Layout

coordination_oru/
├── metacsp/
│   ├── temporal/  # Bounds, Allen relations, STP (Floyd-Warshall)
│   └── spatial/   # Pose, TrajectoryEnvelope, TrajectoryEnvelopeSolver
├── coordinator/   # Critical-section detection, ordering, deadlock check
├── simulation/    # In-process simulator with hardcoded paths
├── data/          # Bundled demo .path files (ship with the wheel)
└── util/          # Footprint helpers, path loaders/generators, structlog setup
examples/          # Standalone runnable demos (python examples/<name>.py)