1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
use std::fmt;
use super::*;
#[derive(Clone, Copy, PartialEq, Debug)]
pub struct HslColor {
pub h: f64,
pub s: f64,
pub l: f64,
}
impl HslColor {
pub fn new(h: f64, s: f64, l: f64) -> Self {
Self { h, s, l }
}
}
impl fmt::Display for HslColor {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "hsl({}°, {}%, {}%)", self.h, self.s, self.l)
}
}
impl From<Color> for HslColor {
fn from(c: Color) -> HslColor {
match Result::<HslColor, ColorError>::from(c) {
Ok(hsl) => hsl,
Err(err) => panic!("Converting Color to CmykColor failed: {}", err)
}
}
}
impl From<Color> for Result<HslColor, ColorError> {
fn from(c: Color) -> Result<HslColor, ColorError> {
match c {
Color::RGB(r, g, b) => RgbColor { r, g, b }.into(),
Color::RGBA(r, g, b, _) => RgbColor { r, g, b }.into(),
Color::HSL(h, s, l) => Ok(HslColor{h, s, l}),
Color::HSV(h, s, v) => RgbColor::from(HsvColor{h, s, v}).into(),
Color::CMYK(c, m, y, k) => RgbColor::from(CmykColor{c, m, y, k}).into(),
Color::CMY(c, m, y) => RgbColor::from(CmykColor{c, m, y, k: 0.0}).into(),
Color::LAB(l, a, b) => RgbColor::from(LabColor{l, a, b}).into(),
}
}
}
impl ToHexString for HslColor {
fn to_hex_string(&self) -> String {
RgbColor::from(*self).to_hex_string()
}
}
impl From<RgbaColor> for HslColor {
fn from(color: RgbaColor) -> HslColor {
HslColor::from(RgbColor::from(color))
}
}
impl From<RgbColor> for HslColor {
fn from(rgb: RgbColor) -> HslColor {
match Result::<HslColor, ColorError>::from(rgb) {
Ok(cmyk) => cmyk,
Err(err) => panic!("Converting RgbColor to HslColor failed: {}", err)
}
}
}
impl From<RgbColor> for Result<HslColor, ColorError> {
fn from(rgb: RgbColor) -> Self {
let RgbColor { r: red, g: green, b: blue} = rgb;
let r_prime = red as f64 / 255.;
let g_prime = green as f64 / 255.;
let b_prime = blue as f64 / 255.;
let c_max = [red, green, blue].iter().max().cloned().unwrap() as f64 / 255.;
let c_min = [red, green, blue].iter().min().cloned().unwrap() as f64 / 255.;
let delta = c_max - c_min;
let hue = if (delta - 0.) < f64::EPSILON {
0.
} else {
match c_max {
x if x == r_prime => 60. * (((g_prime - b_prime) / delta) % 6.),
x if x == g_prime => 60. * (((b_prime - r_prime) / delta) + 2.),
x if x == b_prime => 60. * (((r_prime - g_prime) / delta) + 4.),
_ => unreachable!("Invalid hue calculation!"),
}.round()
};
let lightness = (c_max + c_min) / 2.;
let saturation = if (delta - 0.) < f64::EPSILON {
0.
} else {
(delta / (1. - ((2. * lightness) - 1.)) * 100.).round()
};
Ok(HslColor { h: hue, s: saturation, l: (lightness * 100.).round() })
}
}