Hello @lucasw. The bézier-rs library is not really maintained since its original creators don't contribute any more.

There is currently no function for converting parametric to euclidean. You can reasonably easily do something like:

let curve = Bezier::from_cubic_coordinates(0., 2., 4., 3., 6., 5., 7., -4.);
let parametric = 0.7;
let [before, after] = curve.split(parametric).map(|split| split.length(None));
let euclidean = before / (before + after);

Note that the performance of the length function has been significantly improved in the unreleased version compared to 0.4.

The bézier-rs library is not really maintained since its original creators don't contribute any more.

But it's getting some maintainance here as a part of graphite- but I shouldn't expect updates to https://crates.io/crates/bezier-rs? I'm fine with this

[dependencies.bezier-rs]
git = "https://github.com/GraphiteEditor/Graphite.git"
tag = "latest-stable"

(and if you are taking PRs I'd like to make project() return a TValue, getting an f64 tripped me up for a while before I realized the Parametric-Euclidean difference, the compiler could have told me much faster)

Thanks for pointing out split (and it turns out I didn't actually need the euclidean distance ratio, just the length of the segment before the TValue).

Contributions are definitely welcome! I'm also working towards a new release once I have the bandwidth to square away a few outstanding issues.