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use num_traits::{self, zero};
use num_traits::NumCast;
use angle::*;
use {Color, FloatColor};
use {Channel, FloatChannel};
use {Rgb, ToRgb};
#[inline]
fn cast<T: num_traits::NumCast, U: num_traits::NumCast>(n: T) -> U {
num_traits::cast(n).unwrap()
}
#[derive(Serialize, Deserialize, Clone, Copy, Debug)]
pub struct Hsv<T: Channel> { pub h: Deg<T>, pub s: T, pub v: T }
impl<T: Channel> Hsv<T> {
pub fn new(h: Deg<T>, s: T, v: T) -> Hsv<T> {
Hsv { h: h, s: s, v: v }
}
}
impl<T: Channel + NumCast> Color<T> for Hsv<T> {
#[inline]
fn clamp_s(self, lo: T, hi: T) -> Hsv<T> {
Hsv::new(self.h,
self.s.clamp(lo, hi),
self.v.clamp(lo, hi))
}
#[inline]
fn clamp_c(self, lo: Hsv<T>, hi: Hsv<T>) -> Hsv<T> {
Hsv::new(self.h,
self.s.clamp(lo.s, hi.s),
self.v.clamp(lo.v, hi.v))
}
#[inline]
fn inverse(self) -> Hsv<T> {
Hsv::new((self.h + Deg(cast(180))).wrap(),
self.s.invert_channel(),
self.v.invert_channel())
}
#[inline]
fn mix(self, other: Self, value: T) -> Self {
self.to_rgb().mix(other.to_rgb(),value).to_hsv()
}
}
impl<T: FloatChannel> FloatColor<T> for Hsv<T> {
#[inline]
fn saturate(self) -> Hsv<T> {
Hsv::new(self.h.wrap(),
self.s.saturate(),
self.v.saturate())
}
}
pub trait ToHsv {
fn to_hsv<U:Channel + NumCast>(&self) -> Hsv<U>;
}
impl ToHsv for u32 {
#[inline]
fn to_hsv<U:Channel>(&self) -> Hsv<U> {
panic!("Not yet implemented")
}
}
impl ToHsv for u64 {
#[inline]
fn to_hsv<U:Channel>(&self) -> Hsv<U> {
panic!("Not yet implemented")
}
}
impl<T:Channel> ToHsv for Hsv<T> {
#[inline]
fn to_hsv<U:Channel>(&self) -> Hsv<U> {
Hsv::new(Deg(cast(self.h.value())),
self.s.to_channel(),
self.v.to_channel())
}
}
impl<T:Clone + Channel> ToRgb for Hsv<T> {
fn to_rgb<U:Channel>(&self) -> Rgb<U> {
if self.v.is_zero() {
rgb!(zero(), zero(), zero())
} else if self.s.is_zero() {
let gray = Channel::from(self.v);
rgb!(gray, gray, gray)
} else {
let max_f: f64 = cast(T::max());
let hue: f64 = cast(self.h.wrap().value());
let hue_six: f64 = hue / 360f64 * 6f64;
let hue_six_cat: usize = cast(hue_six);
let hue_six_rem: T = cast(hue_six.fract() * max_f);
let pv = Channel::from((T::max() - self.s).normalized_mul(self.v));
let qv = Channel::from((T::max() - self.s.normalized_mul(hue_six_rem)).normalized_mul(self.v));
let tv = Channel::from((T::max() - self.s.normalized_mul(T::max() - hue_six_rem)).normalized_mul(self.v));
let b: U = Channel::from(self.v);
match hue_six_cat {
0 | 6 => rgb!(b,tv,pv),
1 => rgb!(qv, b, pv),
2 => rgb!(pv, b, tv),
3 => rgb!(pv, qv, b),
4 => rgb!(tv, pv, b),
5 => rgb!(b, pv, qv),
_ => panic!("Unreachable code")
}
}
}
}
#[cfg(test)]
mod tests {
use {Hsv, ToHsv};
use {Rgb, ToRgb};
use angle::*;
#[test]
fn test_hsv_to_hsv() {
assert_eq!(Hsv::<f64>::new(Deg(0.0), 0.0, 1.0).to_hsv::<f32>(), Hsv::<f32>::new(Deg(0.0), 0.0, 1.0));
assert_eq!(Hsv::<f64>::new(Deg(0.0), 1.0, 0.6).to_hsv::<f32>(), Hsv::<f32>::new(Deg(0.0), 1.0, 0.6));
assert_eq!(Hsv::<f64>::new(Deg(120.0), 1.0, 0.6).to_hsv::<f32>(), Hsv::<f32>::new(Deg(120.0), 1.0, 0.6));
assert_eq!(Hsv::<f64>::new(Deg(240.0), 1.0, 0.6).to_hsv::<f32>(), Hsv::<f32>::new(Deg(240.0), 1.0, 0.6));
}
#[test]
fn test_hsv_to_rgb() {
assert_eq!(Hsv::<f32>::new(Deg(0.0), 0.0, 1.0).to_rgb::<u8>(), Rgb::<u8>::new(0xFF, 0xFF, 0xFF));
assert_eq!(Hsv::<f32>::new(Deg(0.0), 1.0, 0.6).to_rgb::<u8>(), Rgb::<u8>::new(0x99, 0x00, 0x00));
assert_eq!(Hsv::<f32>::new(Deg(120.0), 1.0, 0.6).to_rgb::<u8>(), Rgb::<u8>::new(0x00, 0x99, 0x00));
assert_eq!(Hsv::<f32>::new(Deg(240.0), 1.0, 0.6).to_rgb::<u8>(), Rgb::<u8>::new(0x00, 0x00, 0x99));
assert_eq!(Hsv::<u16>::new(Deg(0), 0, 65535).to_rgb::<u8>(), Rgb::<u8>::new(0xFF, 0xFF, 0xFF));
assert_eq!(Hsv::<u16>::new(Deg(0), 65535, 39321).to_rgb::<u8>(), Rgb::<u8>::new(0x99, 0x00, 0x00));
assert_eq!(Hsv::<u16>::new(Deg(120), 65535, 39321).to_rgb::<u8>(), Rgb::<u8>::new(0x00, 0x99, 0x00));
assert_eq!(Hsv::<u16>::new(Deg(240), 65535, 39321).to_rgb::<u8>(), Rgb::<u8>::new(0x00, 0x00, 0x99));
}
}