plexus 0.0.5

3D mesh generation and manipulation.
Documentation 
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use num::Num;

pub trait Unit: Copy + Num {
    fn unit_radius() -> (Self, Self);
    fn unit_width() -> (Self, Self);
}

// TODO: https://github.com/reem/rust-ordered-float/pull/31
//       Once `NotNan` implements numeric traits, implement `Unit` for `NotNan`
//       and allow it to be used as vertex geometry in generators.
macro_rules! unit {
    (integer => $($t:ty),*) => {$(
        impl Unit for $t {
            fn unit_radius() -> (Self, Self) {
                use num::{One, Zero};
                (Self::zero(), Self::one() + Self::one())
            }

            fn unit_width() -> (Self, Self) {
                use num::{One, Zero};
                (Self::zero(), Self::one())
            }
        }
    )*};
    (real => $($t:ty),*) => {$(
        impl Unit for $t {
            fn unit_radius() -> (Self, Self) {
                use num::One;
                (-Self::one(), Self::one())
            }

            fn unit_width() -> (Self, Self) {
                use num::One;
                let half = Self::one() / (Self::one() + Self::one());
                (-half, half)
            }
        }
    )*};
}
unit!(integer => i8, i16, i32, i64, u8, u16, u32, u64);
unit!(real => f32, f64);