nalgebra/src/geometry/swizzle.rs

67 lines
2.3 KiB
Rust

use crate::base::{Const, Scalar, ToTypenum};
use crate::geometry::{Point, Point2, Point3};
use typenum::{self, Cmp, Greater};
macro_rules! impl_swizzle {
($( where $BaseDim: ident: $( $name: ident() -> $Result: ident[$($i: expr),+] ),+ ;)* ) => {
$(
$(
/// Builds a new point from components of `self`.
#[inline]
pub fn $name(&self) -> $Result<N>
where <Const<D> as ToTypenum>::Typenum: Cmp<typenum::$BaseDim, Output=Greater> {
$Result::new($(self[$i].inlined_clone()),*)
}
)*
)*
}
}
/// # Swizzling
impl<N: Scalar, const D: usize> Point<N, D>
where
Const<D>: ToTypenum,
// DefaultAllocator: Allocator<N, D>,
{
impl_swizzle!(
where U0: xx() -> Point2[0, 0],
xxx() -> Point3[0, 0, 0];
where U1: xy() -> Point2[0, 1],
yx() -> Point2[1, 0],
yy() -> Point2[1, 1],
xxy() -> Point3[0, 0, 1],
xyx() -> Point3[0, 1, 0],
xyy() -> Point3[0, 1, 1],
yxx() -> Point3[1, 0, 0],
yxy() -> Point3[1, 0, 1],
yyx() -> Point3[1, 1, 0],
yyy() -> Point3[1, 1, 1];
where U2: xz() -> Point2[0, 2],
yz() -> Point2[1, 2],
zx() -> Point2[2, 0],
zy() -> Point2[2, 1],
zz() -> Point2[2, 2],
xxz() -> Point3[0, 0, 2],
xyz() -> Point3[0, 1, 2],
xzx() -> Point3[0, 2, 0],
xzy() -> Point3[0, 2, 1],
xzz() -> Point3[0, 2, 2],
yxz() -> Point3[1, 0, 2],
yyz() -> Point3[1, 1, 2],
yzx() -> Point3[1, 2, 0],
yzy() -> Point3[1, 2, 1],
yzz() -> Point3[1, 2, 2],
zxx() -> Point3[2, 0, 0],
zxy() -> Point3[2, 0, 1],
zxz() -> Point3[2, 0, 2],
zyx() -> Point3[2, 1, 0],
zyy() -> Point3[2, 1, 1],
zyz() -> Point3[2, 1, 2],
zzx() -> Point3[2, 2, 0],
zzy() -> Point3[2, 2, 1],
zzz() -> Point3[2, 2, 2];
);
}