inire/examples/02_congestion_resolution.py

from inire import CongestionOptions, NetSpec, ObjectiveWeights, Port, RoutingOptions, RoutingProblem, SearchOptions, route
from inire.utils.visualization import plot_routing_results


def main() -> None:
    print("Running Example 02: Congestion Resolution (Triple Crossing)...")

    bounds = (0, 0, 100, 100)
    netlist = {
        "horizontal": (Port(10, 50, 0), Port(90, 50, 0)),
        "vertical_up": (Port(45, 10, 90), Port(45, 90, 90)),
        "vertical_down": (Port(55, 90, 270), Port(55, 10, 270)),
    }
    problem = RoutingProblem(
        bounds=bounds,
        nets=tuple(NetSpec(net_id, start, target, width=2.0) for net_id, (start, target) in netlist.items()),
    )
    options = RoutingOptions(
        search=SearchOptions(
            bend_radii=(10.0,),
            sbend_radii=(10.0,),
            greedy_h_weight=1.5,
        ),
        objective=ObjectiveWeights(
            bend_penalty=50.0,
            sbend_penalty=150.0,
        ),
        congestion=CongestionOptions(base_penalty=1000.0),
    )

    run = route(problem, options=options)
    all_valid = all(result.is_valid for result in run.results_by_net.values())
    if all_valid:
        print("Success! Congestion resolved for all nets.")
    else:
        print("Failed to resolve congestion for some nets.")

    fig, _ax = plot_routing_results(run.results_by_net, [], bounds, netlist=netlist)
    fig.savefig("examples/02_congestion_resolution.png")
    print("Saved plot to examples/02_congestion_resolution.png")


if __name__ == "__main__":
    main()