# geometry-adapt-nalgebra
Part of the [boost_geometry](https://crates.io/crates/boost_geometry) workspace — a Rust port of [Boost.Geometry](https://www.boost.org/doc/libs/release/libs/geometry/). Most users should depend on the facade crate, which re-exports this one; depend on this crate directly only for a slimmer build.
Adapt `nalgebra` points and vectors to the `geometry-trait`
concept surface.
Mirrors the role of the Boost `BOOST_GEOMETRY_REGISTER_*` macros in
`boost/geometry/geometries/adapted/` — those specialise the C++
`traits::{tag, dimension, coordinate_type, coordinate_system,
access}` metafunctions for a foreign storage layout. Rust has no
specialisation and the orphan rule forbids implementing a foreign
trait ([`geometry_trait::Point`]) for a foreign type
(`nalgebra::Point2` et al.), so — as with
[`geometry_adapt::Adapt`](https://docs.rs/geometry-adapt) — each
foreign value is wrapped in a local `#[repr(transparent)]` newtype
and the geometry concepts hang off the wrapper.
Two domain nouns are adapted:
* [`NaPoint2`] / [`NaPoint3`] — `nalgebra::Point2` / `Point3`.
* [`NaVector2`] / [`NaVector3`] — `nalgebra::Vector2` / `Vector3`.
Every wrapper pins `Cs = Cartesian`. `nalgebra` points and vectors
are read-write, so each also implements
[`geometry_trait::PointMut`].
## License
BSL-1.0 — see [LICENSE](https://github.com/pentatonick/boost_geometry/blob/main/LICENSE).