Function mat2::set_rotation

pub fn set_rotation<'out, T>(
    out: &'out mut [T; 4], 
    angle: &T
) -> &'out mut [T; 4] where
    T: Float + Neg<Output = T>, 

Example

use std::f32;
let mut m = mat2::new_identity::<f32>();
mat2::set_rotation(&mut m, &f32::consts::FRAC_PI_2);
assert_eq!(m[1], 1f32);
assert_eq!(m[2], -1f32);