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use super::{Color, Float};
use std::fmt;
/// Cmyk color representation
#[derive(Clone, Copy, PartialEq, Debug)]
pub struct CmykColor {
/// Cyan component
pub cyan: Float,
/// Magenta component
pub magenta: Float,
/// Yellow component
pub yellow: Float,
/// Key component
pub key: Float,
}
impl CmykColor {
/// Create new Cmyk color with parameters
pub fn new(cyan: Float, magenta: Float, yellow: Float, key: Float) -> Self {
Self {
cyan,
magenta,
yellow,
key,
}
}
}
impl fmt::Display for CmykColor {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(
f,
"cmyk({}%, {}%, {}%, {}%)",
self.cyan, self.magenta, self.yellow, self.key
)
}
}
// CMYK -> RGB
impl From<CmykColor> for Color {
fn from(cmyk: CmykColor) -> Self {
let apply = |v| (1.0 as Float - v / 100.0) * (1.0 - cmyk.key / 100.0);
Color {
red: apply(cmyk.cyan),
green: apply(cmyk.magenta),
blue: apply(cmyk.yellow),
alpha: 1.,
}
}
}
// RGB -> CMYK
impl From<Color> for CmykColor {
fn from(rgb: Color) -> Self {
let key = 1.
- [rgb.red, rgb.green, rgb.blue]
.iter()
.cloned()
.fold(Float::NAN, Float::max);
let apply = |v: Float| (((1. - v - key) / (1. - key)) * 100.).round();
CmykColor {
cyan: apply(rgb.red),
magenta: apply(rgb.green),
yellow: apply(rgb.blue),
key: key * 100.,
}
}
}
#[cfg(test)]
mod test {
// use super::super::*;
// use math::round::stochastic;
//
// lazy_static! {
// static ref TEST_DATA: Vec<(Color, &'static str, CmykColor)> = {
// vec!(
// (Color::RGB(56, 217, 169), "#38d9a9", CmykColor::new(74.0, 0.0, 22.0, 15.0)),
// (Color::RGB(178, 242, 187), "#b2f2bb", CmykColor::new(26.0, 0.0, 23.0, 5.0)),
// (Color::RGB(230, 252, 245), "#e6fcf5", CmykColor::new(9.0, 0.0, 3.0, 1.0)),
// (Color::RGB(18, 184, 134), "#12b886", CmykColor::new(90.0, 0.0, 27.0, 28.0)),
// //(Color::RGB(___), "#______", CmykColor::new(___), HslColor::new(___)),
// )
// };
// }
//
// #[test]
// fn from_rgb() {
// for (color, _, expected_cmyk) in TEST_DATA.iter() {
// let CmykColor {
// cyan: actual_cyan,
// magenta: actual_magenta,
// yellow: actual_yellow,
// key: actual_key,
// } = CmykColor::from(*color);
//
// let CmykColor {
// cyan: expected_cyan,
// magenta: expected_magenta,
// yellow: expected_yellow,
// key: expected_key,
// } = *expected_cmyk;
//
// assert_eq!(
// stochastic(actual_cyan, 0), expected_cyan,
// "wrong cyan in cmyk conversion from {}", color.to_hex_string()
// );
// assert_eq!(
// stochastic(actual_magenta, 0), expected_magenta,
// "wrong magenta in cmyk conversion from {}", color.to_hex_string()
// );
// assert_eq!(
// stochastic(actual_yellow, 0), expected_yellow,
// "wrong yellow in cmyk conversion from {}", color.to_hex_string()
// );
// assert_eq!(
// stochastic(actual_key, 0), expected_key,
// "wrong key in cmyk conversion from {}", color.to_hex_string()
// );
// }
// }
}