Trait ColorExt

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pub trait ColorExt: Copy {
    // Required methods
    fn into_hsla(self) -> Hsla;
    fn contrast_between(
        self,
        check_source: ColorSource,
        check_lightness: ZeroToOne,
        check_alpha: ZeroToOne,
    ) -> ZeroToOne;
    fn most_contrasting(self, others: &[Self]) -> Self
       where Self: Copy;

    // Provided methods
    fn source(self) -> ColorSource { ... }
    fn lightness(self) -> ZeroToOne { ... }
    fn lighten_by(self, amount: ZeroToOne) -> Color { ... }
    fn darken_by(self, amount: ZeroToOne) -> Color { ... }
}

Expand description

Extra functionality added to the Color type from Kludgine.

Required Methods§

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fn into_hsla(self) -> Hsla

Converts this color into its hue, saturation, and lightness components.

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fn contrast_between( self, check_source: ColorSource, check_lightness: ZeroToOne, check_alpha: ZeroToOne, ) -> ZeroToOne

Returns the contrast between this color and the components provided.

To achieve a contrast of 1.0:

self’s hue and check_source.hue must be 180 degrees apart.
self’s saturation and check_source.saturation must be different by 1.0.
self’s lightness and check_lightness must be different by 1.0.
self’s alpha and check_alpha must be different by 1.0.

The algorithm currently used is purposely left undocumented as it will likely change. It should be a reasonable heuristic until someone smarter than @ecton comes along.

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