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
use super::*;
impl From<HslColor> for RgbColor {
fn from(hsl: HslColor) -> RgbColor {
match Result::<RgbColor, ColorError>::from(hsl) {
Ok(rgb) => rgb,
Err(err) => panic!("Converting HslColor to RgbColor failed: {}", err),
}
}
}
impl From<HslColor> for Result<RgbColor, ColorError> {
fn from(hsl: HslColor) -> Result<RgbColor, ColorError> {
let HslColor {
hue,
saturation,
lightness,
} = hsl;
let c = (1. - ((2. * (lightness as f64 / 100.)) - 1.).abs()) * (saturation as f64 / 100.);
let x = c * (1. - ((((hue as f64) / 60.) % 2.) - 1.).abs());
let m = (lightness as f64 / 100.) - (c / 2.);
let (r_prime, g_prime, b_prime) = {
if (0. ..60.).contains(&hue) {
(c, x, 0.)
} else if (60. ..120.).contains(&hue) {
(x, c, 0.)
} else if (120. ..180.).contains(&hue) {
(0., c, x)
} else if (180. ..240.).contains(&hue) {
(0., x, c)
} else if (240. ..300.).contains(&hue) {
(x, 0., c)
} else if (300. ..360.).contains(&hue) {
(c, 0., x)
} else {
return Err(ColorError::DegreeOverflow);
}
};
Ok(RgbColor {
red: ((r_prime + m) * 255.).round() as u8,
green: ((g_prime + m) * 255.).round() as u8,
blue: ((b_prime + m) * 255.).round() as u8,
})
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn to_rgb() {
test_utils::test_to_rgb_conversion(test_utils::RGB_HSL.iter())
}
}