Zero-dependency color library for the Optic engine.

This crate provides color types, conversions, channel arithmetic, and a gradient evaluator. It has no external dependencies and can be used independently of the rest of the engine.

Types

Type	Components	Channels	Arithmetic
[`RGBA`]	red, green, blue, alpha	[`ChannelArray<4>`]	Add, Sub, Mul, Div
[`RGB`]	red, green, blue	[`ChannelArray<3>`]	Add, Sub, Mul, Div
[`HSV`]	hue, saturation, value	—	—
[`HSL`]	hue, saturation, lightness	—	—

HSV and HSL deliberately avoid arithmetic because hue wraparound makes componentwise operations produce wrong colors. Convert to [RGBA] first (via .into() or [ToRgba]), then operate, then convert back.

Conversions

Every color type implements [ToRgba] and [FromRgba], so you can use generics that accept "any color-like type":

use optic_color::*;

fn set_bg(color: impl ToRgba) {
    let rgba = color.to_rgba();
    // ...
}

Direct From impls exist for all pairs:

From<RGB/HSV/HSL> for RGBA
From<RGBA> for RGB/HSV/HSL

Gradients

[Gradient] supports multiple interpolation modes, color spaces, and wrap modes:

use optic_color::*;

let grad = Gradient::two_color(RED, BLUE)
    .set_color_space(GradientColorSpace::Hsv);

let mid = grad.sample(0.5); // RGBA

Named colors

The crate exports ~90 named [RGBA] constants (see [optic_color::constants]). Examples: [RED], [MIDNIGHT], [GOLD], [LAVENDER], [OBSIDIAN].

optic-color 0.0.1

Types

Conversions

Gradients

Named colors