nalgebra/geometry/
swizzle.rs

1use crate::base::{Const, Scalar, ToTypenum};
2use crate::geometry::{Point, Point2, Point3};
3use typenum::{self, Cmp, Greater};
4
5macro_rules! impl_swizzle {
6    ($( where $BaseDim: ident: $( $name: ident() -> $Result: ident[$($i: expr),+] ),+ ;)* ) => {
7        $(
8            $(
9                /// Builds a new point from components of `self`.
10                #[inline]
11                #[must_use]
12                pub fn $name(&self) -> $Result<T>
13                 where <Const<D> as ToTypenum>::Typenum: Cmp<typenum::$BaseDim, Output=Greater> {
14                    $Result::new($(self[$i].clone()),*)
15                }
16            )*
17        )*
18    }
19}
20
21/// # Swizzling
22impl<T: Scalar, const D: usize> Point<T, D>
23where
24    Const<D>: ToTypenum,
25{
26    impl_swizzle!(
27        where U0: xx()  -> Point2[0, 0],
28                  xxx() -> Point3[0, 0, 0];
29
30        where U1: xy()  -> Point2[0, 1],
31                  yx()  -> Point2[1, 0],
32                  yy()  -> Point2[1, 1],
33                  xxy() -> Point3[0, 0, 1],
34                  xyx() -> Point3[0, 1, 0],
35                  xyy() -> Point3[0, 1, 1],
36                  yxx() -> Point3[1, 0, 0],
37                  yxy() -> Point3[1, 0, 1],
38                  yyx() -> Point3[1, 1, 0],
39                  yyy() -> Point3[1, 1, 1];
40
41        where U2: xz()  -> Point2[0, 2],
42                  yz()  -> Point2[1, 2],
43                  zx()  -> Point2[2, 0],
44                  zy()  -> Point2[2, 1],
45                  zz()  -> Point2[2, 2],
46                  xxz() -> Point3[0, 0, 2],
47                  xyz() -> Point3[0, 1, 2],
48                  xzx() -> Point3[0, 2, 0],
49                  xzy() -> Point3[0, 2, 1],
50                  xzz() -> Point3[0, 2, 2],
51                  yxz() -> Point3[1, 0, 2],
52                  yyz() -> Point3[1, 1, 2],
53                  yzx() -> Point3[1, 2, 0],
54                  yzy() -> Point3[1, 2, 1],
55                  yzz() -> Point3[1, 2, 2],
56                  zxx() -> Point3[2, 0, 0],
57                  zxy() -> Point3[2, 0, 1],
58                  zxz() -> Point3[2, 0, 2],
59                  zyx() -> Point3[2, 1, 0],
60                  zyy() -> Point3[2, 1, 1],
61                  zyz() -> Point3[2, 1, 2],
62                  zzx() -> Point3[2, 2, 0],
63                  zzy() -> Point3[2, 2, 1],
64                  zzz() -> Point3[2, 2, 2];
65    );
66}
nalgebra/geometry/swizzle.rs

nalgebra/geometry/
swizzle.rs
