[Rust] The RGB getter of Color class.

impl Color {
    pub fn rgb(& self) -> (u8, u8, u8) {
        match *self {
            Color::RGB{r, g, b} => (r, g, b),
            Color::CMYK{c, m, y, k} => {
                ((255.0 * (1.0 - c) * (1.0 - k)) as u8,
                 (255.0 * (1.0 - m) * (1.0 - k)) as u8,
                 (255.0 * (1.0 - y) * (1.0 - k)) as u8)
            }
            Color::HSL{h, s, l} => {
                // Saturation == 0
                if f64::abs(s) < 1e-10 {
                    return ((255.0 * l) as u8,
                            (255.0 * l) as u8,
                            (255.0 * l) as u8);
                }

                let v2: f64;
                let v1: f64;

                if l < 0.5 {
                    v2 = l * (1.0 + s);
                } else {
                    v2 = (l + s) - s * l
                }

                v1 = 2.0 * l - v2;

                ((255.0 * Self::hue2rgb(
                    v1, v2, ((h as f64)/360.0 + 1.0/3.0))) as u8,
                 (255.0 * Self::hue2rgb(
                    v1, v2, (h as f64)/360.0)) as u8,
                 (255.0 * Self::hue2rgb(
                    v1, v2, ((h as f64)/360.0 - 1.0/3.0))) as u8)
            }
        }
    }
}

impl Color {
    fn hue2rgb(v1: f64, v2: f64, h: f64) -> f64 {
        let mut _h = h;
        if _h < 0.0 {
            _h += 1.0;
        }

        if _h > 1.0 {
            _h -= 1.0;
        }

        if 6.0 * _h < 1.0 {
            return v1 + (v2 - v1) * 6.0 * _h;
        }

        if 2.0 * _h < 1.0 {
            return v2;
        }

        if 3.0 * _h < 2.0 {
            return v1 + (v2 - v1) * ((2.0 / 3.0 - _h) * 6.0);
        }

        v1
    }
}