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use super::Color; use std::fmt; #[derive(Clone, Copy, PartialEq, Debug)] pub struct CmykColor { pub cyan: f64, pub magenta: f64, pub yellow: f64, pub key: f64, } impl CmykColor { pub fn new(cyan: f64, magenta: f64, yellow: f64, key: f64) -> 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| (1.0f64 - 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(f64::NAN, f64::max); let apply = |v: f64| (((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() // ); // } // } }