vizkit 0.1.1

A rendering-agnostic kit for data visualization
Documentation 
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use std::f32;

use super::color::Color;

pub fn sinebow<T>(t: f32) -> T
where
    Color: Into<T>,
{
    let pi = f32::consts::PI;
    let t = (0.5 - t) * pi;

    let x = t.sin();
    let r = x * x;

    let x = (t + pi / 3.).sin();
    let g = x * x;

    let x = (t + pi * 2. / 3.).sin();
    let b = x * x;

    Color([r, g, b]).into()
}

#[cfg(test)]
mod tests {
    use super::sinebow;

    #[test]
    fn test_sinebow() {
        let step = 100;
        let colors: Vec<[f32; 3]> = (0..=step)
            .map(|i| sinebow(i as f32 / step as f32))
            .collect();
        for color in colors {
            let [r, g, b] = color;
            assert!(
                (0. ..=1.).contains(&r),
                "red must be between [0, 1] (sinebow)",
            );
            assert!(
                (0. ..=1.).contains(&g),
                "green must be between [0, 1] (sinebow)",
            );
            assert!(
                (0. ..=1.).contains(&b),
                "blue must be between [0, 1] (sinebow)",
            );
        }
    }
}