Macro swizzle
macro_rules! swizzle {
($vec:expr => $a:ident, $b:ident) => { ... };
($vec:expr => $a:ident, $b:ident, $c:ident) => { ... };
($vec:expr => $a:ident, $b:ident, $c:ident, $d:ident) => { ... };
}
Expand description
Access vector components in different order.
Allows to rearrange components, as well as to create higher- or lower-order vectors.
This macro supports all vector types (2D, 3D, 4D; both integer and float). The resulting vector type is deduced from the number and types of components.
To repeat a single component, check out the splat
method on specific vector types.
ยงExamples
Reorder or duplicate fields:
use godot::prelude::*;
let vec3 = Vector3i::new(1, 2, 3);
let xzx = swizzle!(vec3 => x, z, x); // Vector3i
assert_eq!(xzx, Vector3i::new(1, 3, 1));
Create lower-order vector:
let vec4 = Vector4::new(1.0, 2.0, 3.0, 4.0);
let yw = swizzle!(vec4 => y, w); // Vector2
assert_eq!(yw, Vector2::new(2.0, 4.0));
Create higher-order vector:
let vec3 = Vector3i::new(1, 2, 3);
let xyyz = swizzle!(vec3 => x, y, y, z); // Vector4i
assert_eq!(xyyz, Vector4i::new(1, 2, 2, 3));