affine-rs 0.1.0

Two-dimensional affine transformations for Rust
Documentation 
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#![allow(clippy::float_cmp)]

use affine_rs::Affine;

#[test]
fn default_is_identity() {
    assert_eq!(Affine::default(), Affine::IDENTITY);
}

#[test]
fn constructs_common_transforms() {
    assert_eq!(
        Affine::translation(1.0, 5.0),
        Affine::new(1.0, 0.0, 1.0, 0.0, 1.0, 5.0)
    );
    assert_eq!(
        Affine::scale(2.0, 3.0),
        Affine::new(2.0, 0.0, 0.0, 0.0, 3.0, 0.0)
    );
    assert_eq!(
        Affine::permutation(),
        Affine::new(0.0, 1.0, 0.0, 1.0, 0.0, 0.0)
    );
}

#[test]
fn rotation_has_exact_right_angles() {
    assert_eq!(
        Affine::rotation(90.0),
        Affine::new(0.0, -1.0, 0.0, 1.0, 0.0, 0.0)
    );
    assert_eq!(
        Affine::rotation(-90.0),
        Affine::new(0.0, 1.0, 0.0, -1.0, 0.0, 0.0)
    );
}

#[test]
fn rotates_around_pivot() {
    let transform = Affine::rotation_around(90.0, [1.0, 1.0]);
    assert_eq!(transform.transform_point([2.0, 1.0]), [1.0, 2.0]);
}