gem 0.1.0-alpha.5

Color representations and conversions
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/// A trait for types that have a green component.
pub trait HasGreen {
    /// The type of the green component.
    type Component;

    /// Returns the value of the green component.
    #[must_use]
    fn green(&self) -> Self::Component;

    /// Sets the green component to the given value.
    ///
    /// If the color has other components, they are left unchanged.
    fn set_green(&mut self, value: Self::Component);

    /// Converts the color into a new type with the green component set to the given value.
    ///
    /// The other components are left unchanged.
    #[must_use]
    fn with_green(self, value: Self::Component) -> Self
    where
        Self: Copy + Clone,
    {
        let mut color = self;
        color.set_green(value);
        color
    }
}

#[cfg(test)]
#[allow(clippy::float_cmp)]
mod tests {
    use crate::rgb::Rgb888;

    use super::*;

    #[test]
    fn with_green_rgb888_get_green() {
        assert_eq!(Rgb888::from_rgb(0, 255, 0).green(), 255);
    }

    #[test]
    fn with_green_rgb888_set_green() {
        let mut color = Rgb888::from_rgb(0, 255, 0);
        color.set_green(128);
        assert_eq!(color, Rgb888::from_rgb(0, 128, 0));
    }

    #[test]
    fn with_green_rgb888_with_green() {
        let color = Rgb888::from_rgb(0, 255, 0);
        let new_color = color.with_green(128);
        assert_eq!(new_color, Rgb888::from_rgb(0, 128, 0));
    }
}