primitives/foundation/colorspace/
cmyk.rs

1use super::{Color, Float};
2use std::fmt;
3
4/// Cmyk color representation
5#[derive(Clone, Copy, PartialEq, Debug)]
6pub struct CmykColor {
7    /// Cyan component
8    pub cyan: Float,
9    /// Magenta component
10    pub magenta: Float,
11    /// Yellow component
12    pub yellow: Float,
13    /// Key component
14    pub key: Float,
15}
16
17impl CmykColor {
18    /// Create new Cmyk color with parameters
19    pub fn new(cyan: Float, magenta: Float, yellow: Float, key: Float) -> Self {
20        Self {
21            cyan,
22            magenta,
23            yellow,
24            key,
25        }
26    }
27}
28
29impl fmt::Display for CmykColor {
30    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
31        write!(
32            f,
33            "cmyk({}%, {}%, {}%, {}%)",
34            self.cyan, self.magenta, self.yellow, self.key
35        )
36    }
37}
38
39// CMYK -> RGB
40impl From<CmykColor> for Color {
41    fn from(cmyk: CmykColor) -> Self {
42        let apply = |v| (1.0 as Float - v / 100.0) * (1.0 - cmyk.key / 100.0);
43        Color {
44            red: apply(cmyk.cyan),
45            green: apply(cmyk.magenta),
46            blue: apply(cmyk.yellow),
47            alpha: 1.,
48        }
49    }
50}
51
52// RGB -> CMYK
53impl From<Color> for CmykColor {
54    fn from(rgb: Color) -> Self {
55        let key = 1.
56            - [rgb.red, rgb.green, rgb.blue]
57                .iter()
58                .cloned()
59                .fold(Float::NAN, Float::max);
60
61        let apply = |v: Float| (((1. - v - key) / (1. - key)) * 100.).round();
62        CmykColor {
63            cyan: apply(rgb.red),
64            magenta: apply(rgb.green),
65            yellow: apply(rgb.blue),
66            key: key * 100.,
67        }
68    }
69}
70
71#[cfg(test)]
72mod test {
73    // use super::super::*;
74    // use math::round::stochastic;
75    //
76    // lazy_static! {
77    //     static ref TEST_DATA: Vec<(Color, &'static str, CmykColor)> = {
78    //         vec!(
79    //             (Color::RGB(56, 217, 169), "#38d9a9", CmykColor::new(74.0, 0.0, 22.0, 15.0)),
80    //             (Color::RGB(178, 242, 187), "#b2f2bb", CmykColor::new(26.0, 0.0, 23.0, 5.0)),
81    //             (Color::RGB(230, 252, 245), "#e6fcf5", CmykColor::new(9.0, 0.0, 3.0, 1.0)),
82    //             (Color::RGB(18, 184, 134), "#12b886", CmykColor::new(90.0, 0.0, 27.0, 28.0)),
83    //             //(Color::RGB(___), "#______", CmykColor::new(___), HslColor::new(___)),
84    //         )
85    //     };
86    // }
87    //
88    // #[test]
89    // fn from_rgb() {
90    //     for (color, _, expected_cmyk) in TEST_DATA.iter() {
91    //         let CmykColor {
92    //             cyan: actual_cyan,
93    //             magenta: actual_magenta,
94    //             yellow: actual_yellow,
95    //             key: actual_key,
96    //         } = CmykColor::from(*color);
97    //
98    //         let CmykColor {
99    //             cyan: expected_cyan,
100    //             magenta: expected_magenta,
101    //             yellow: expected_yellow,
102    //             key: expected_key,
103    //         } = *expected_cmyk;
104    //
105    //         assert_eq!(
106    //             stochastic(actual_cyan, 0), expected_cyan,
107    //             "wrong cyan in cmyk conversion from {}", color.to_hex_string()
108    //         );
109    //         assert_eq!(
110    //             stochastic(actual_magenta, 0), expected_magenta,
111    //             "wrong magenta in cmyk conversion from {}", color.to_hex_string()
112    //         );
113    //         assert_eq!(
114    //             stochastic(actual_yellow, 0), expected_yellow,
115    //             "wrong yellow in cmyk conversion from {}", color.to_hex_string()
116    //         );
117    //         assert_eq!(
118    //             stochastic(actual_key, 0), expected_key,
119    //             "wrong key in cmyk conversion from {}", color.to_hex_string()
120    //         );
121    //     }
122    // }
123}
primitives/foundation/colorspace/cmyk.rs

primitives/foundation/colorspace/
cmyk.rs
