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use super::{utils, Color, ColorError, Float};
use std::fmt;
use utils::{hue_bound, percentage_to_fraction};
#[derive(Clone, Copy, PartialEq, Debug)]
pub struct HsvColor {
pub hue: Float,
pub saturation: Float,
pub value: Float,
}
impl HsvColor {
pub fn new(hue: Float, saturation: Float, value: Float) -> Self {
Self {
hue: hue_bound(hue),
saturation: if saturation > 100. {
100.
} else if saturation < 0. {
0.
} else {
saturation
},
value: if saturation > 100. {
100.
} else if saturation < 0. {
0.
} else {
value
},
}
}
}
impl fmt::Display for HsvColor {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "hsv({}, {}, {})", self.hue, self.saturation, self.value)
}
}
impl From<HsvColor> for Color {
fn from(hsv: HsvColor) -> Self {
let hue = hue_bound(hsv.hue);
let value = percentage_to_fraction(hsv.value);
let saturation = percentage_to_fraction(hsv.saturation);
let min = (1. - saturation) * value;
let a = (value - min) * ((hue % 60.) / 60.);
if (0.0..60.0).contains(&hue) {
Color::new(value, min + a, min, 1.)
} else if (60.0..120.0).contains(&hue) {
Color::new(value - a, value, min, 1.)
} else if (120.0..180.0).contains(&hue) {
Color::new(min, value, min + a, 1.)
} else if (180.0..240.0).contains(&hue) {
Color::new(min, value - a, value, 1.)
} else if (240.0..300.0).contains(&hue) {
Color::new(min + a, min, value, 1.)
} else if (300.0..360.0).contains(&hue) {
Color::new(value, min, value - a, 1.)
} else {
unreachable!("HSV -> RGB: {}", ColorError::DegreeOverflow);
}
}
}
impl From<Color> for HsvColor {
fn from(rgb: Color) -> Self {
let Color {
red,
green,
blue,
alpha: _,
} = rgb;
let (min, max) = utils::min_max_tuple([red, green, blue].iter());
let hue = if (max - red).abs() < Float::MIN_POSITIVE {
if green >= blue {
60. * (green as Float - blue as Float) / (max - min) as Float
} else {
360. - (green as Float - blue as Float) / (max - min) as Float * 60.
}
} else if (max - green).abs() < Float::MIN_POSITIVE {
60. * (blue as Float - red as Float) / (max - min) as Float + 120.
} else if (max - blue).abs() < Float::MIN_POSITIVE {
60. * (red as Float - green as Float) / (max - min) as Float + 240.
} else {
0.
};
let saturation = 1.
- (if (max - 0.).abs() < Float::EPSILON {
0 as Float
} else {
min as Float / max as Float
});
HsvColor::new(hue, saturation * 100., max * 100.)
}
}
#[cfg(test)]
mod test {
use super::super::*;
#[test]
fn hsv_to_rgb() {
test_utils::test_to_rgb_conversion(test_utils::RGB_HSV.iter())
}
#[test]
fn rgb_to_hsv() {
test_utils::test_conversion(test_utils::RGB_HSV.iter(), |actual_color, expected_hsv| {
let actual_rgb: RgbColor = (*actual_color).into();
let actual_hsv: HsvColor = actual_rgb.into();
let HsvColor {
hue: actual_h,
saturation: actual_s,
value: actual_v,
} = actual_hsv;
let (actual_h, actual_s, actual_v) =
(actual_h.round(), actual_s.round(), actual_v.round());
let HsvColor {
hue: expected_h,
saturation: expected_s,
value: expected_v,
} = *expected_hsv;
assert!(
test_utils::diff_less_than_f64(actual_h, expected_h, 1.),
"wrong hue: {} -> {} != {}",
actual_rgb,
actual_hsv,
expected_hsv
);
assert!(
test_utils::diff_less_than_f64(actual_s, expected_s, 1.),
"wrong saturation: {} -> {} != {}",
actual_rgb,
actual_hsv,
expected_hsv
);
assert!(
test_utils::diff_less_than_f64(actual_v, expected_v, 1.),
"wrong brightness: {} -> {} != {}",
actual_rgb,
actual_hsv,
expected_hsv
);
})
}
}