@terrazzo/use-color

React hook for memoizing and transforming any web-compatible color. Only 18 kB (with full support for all web color spaces!) thanks to Color.js.

Setup

npm i @terrazzo/use-color

import useColor, { formatCSS } from "@terrazzo/use-color";

const [color, setColor] = useColor("color(srgb 0.0 0.3 1.0)");

// Reading

color.css; // color(srgb 0.0 0.3 1.0)
color.original; // { mode: "srgb", r: 0, g: 0.3, b: 1.0, alpha: 1 }
color.p3; // { mode: "p3", r: 0.1184, g: 0.2956, b: 0.9611 }
formatCSS(color.p3); // color(display-p3 0.1184 0.2956 0.9611)

// Setting color

setColor("color(display-p3 0.12 0.3 0.98)");
setColor({ mode: "p3", r: 0.12, g: 0.3, b: 0.98 });

// Adjusting color relatively (lighten by 10% via Oklab)

setColor({ ...color.original.oklab, l: color.oklab.l + 0.1 });

Reading color

The color is fully memoized, so it can be used in any useEffect() hooks. This uses Color.js to convert colors, but only the CSS Color Module 4 colorspaces are loaded. Further, all the properties are getters that cache their output, so even if accessing a different format, work will never be redone. You have the following property available:

| Property | Type | Description | | :------------ | :------- | :------------------------------------------------------------------------------------------------------------ | | css | string | CSS-compatible color using Color Module 4 | | original | object | Color.js color object using the original mode of the color (tip: use color.original.mode to see the format) | | a98 | object | Color.js A98 color object | | hsl | object | Color.js HSL color object | | hsv | object | Color.js HSV color object | | lrgb | object | Color.js LinearRGB color object | | lab | object | Color.js CIELab color object (not to be confused with Oklab) | | lch | object | Color.js CIELCh color object (not to be confused with Oklch) | | luv | object | Color.js LUV color object | | okhsl | object | Color.js Okhsl color object | | okhsv | object | Color.js Okhsv color object | | oklab | object | Color.js Oklab color object | | oklch | object | Color.js Oklch color object | | p3 | object | Color.js P3 color object | | prophotoRgb | object | Color.js ProPhotoRGB color object | | rec2020 | object | Color.js Rec2020 color object | | srgb | object | Color.js sRGB color object | | xyz | object | (alias of xyz65) | | xyz50 | object | Color.js Xyz50 color object | | xyz65 | object | Color.js Xyz65 color object |

Setting color

Setting color can be done by either passing in any valid CSS string:

const [color, setColor] = useColor();

setColor("color(display-p3 0.12 0.3 0.98)");

Or any Color.js object:

const [color, setColor] = useColor();

setColor({ spaceId: "p3", coords: [0.12, 0.3, 0.98] });

Or adjusting the color object relatively (tip: for most purposes, adjusting by oklab will yield the best results):

const [color, setColor] = useColor();

setColor({
  ...color.oklab,
  coords: [
    color.oklab.coords[0] + 0.1, // Lighten by 10% via Oklab
    color.oklab.coords[1],
    color.oklab.coords[2],
  ],
});

Note: if adjusting by a different color space, that will affect the color.original and color.css output, which pulls the most-recently-used color space.