ndarray-vision 0.3.0

A computer vision library built on top of ndarray
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use ndarray::{array, prelude::*};

pub enum Axes {
    X,
    Y,
    Z,
}

pub fn rotate_around_centre(radians: f64, centre: (f64, f64)) -> Array2<f64> {
    translation(centre.0, centre.1)
        .dot(&rotation_3d(radians, Axes::Z))
        .dot(&translation(-centre.0, -centre.1))
}

pub fn rotation_2d(radians: f64) -> Array2<f64> {
    let s = radians.sin();
    let c = radians.cos();
    array![[c, -s], [s, c]]
}

pub fn rotation_3d(radians: f64, ax: Axes) -> Array2<f64> {
    let s = radians.sin();
    let c = radians.cos();

    match ax {
        Axes::X => array![[1.0, 0.0, 0.0], [0.0, c, -s], [0.0, s, c]],
        Axes::Y => array![[c, 0.0, s], [0.0, 1.0, 0.0], [-s, 0.0, c]],
        Axes::Z => array![[c, -s, 0.0], [s, c, 0.0], [0.0, 0.0, 1.0]],
    }
}

pub fn translation(x: f64, y: f64) -> Array2<f64> {
    array![[1.0, 0.0, x], [0.0, 1.0, y], [0.0, 0.0, 1.0]]
}

pub fn scale(x: f64, y: f64) -> Array2<f64> {
    array![[x, 0.0, 0.0], [0.0, y, 0.0], [0.0, 0.0, 1.0]]
}

pub fn shear(x: f64, y: f64) -> Array2<f64> {
    array![[1.0, x, 0.0], [y, 1.0, 0.0], [0.0, 0.0, 1.0]]
}