@tolokoban/ui
Version:
React components with theme
220 lines • 17 kB
JavaScript
const canvas = document.createElement("canvas");
canvas.width = 1;
canvas.height = 1;
const INV_6 = 1 / 6;
class Color {
static get ctx() {
if (!Color._ctx) {
const canvas = document.createElement("canvas");
canvas.width = 1;
canvas.height = 1;
const ctx = canvas.getContext("2d");
if (!ctx)
throw Error("[Color] Unable to create CanvasRenderingContext2D!");
Color._ctx = ctx;
}
return Color._ctx;
}
static makeGradient(size, ...from) {
const colors = [];
const factor = 1 / (size - 1);
for (let i = 0; i < size; i++) {
colors.push(Color.mix(i * factor, ...from));
}
return colors;
}
/**
* Get a value from a colorramp made of `from` colors.
*
* @param from Colors
* @param value From 0.0 to 1.0
*/
static mix(value, ...from) {
const inputs = from.map((source) => new Color(source));
const steps = inputs.length - 1;
if (steps < 0)
return new Color("#000");
if (steps === 0)
return inputs[0];
const start = Math.min(Math.floor(value * steps), steps - 1);
const colorA = inputs[start + 1];
const colorB = inputs[start];
const a = steps * (value - start / steps);
const b = 1 - a;
return new Color(`color-mix(in lch, ${colorA.toString()}, ${colorB.toString()} ${100 * b}%)`);
}
static isLight(colorSource) {
const color = new Color(colorSource);
return color.isLight();
}
static isDark(colorSource) {
const color = new Color(colorSource);
return color.isDark();
}
/**
* @param backgroundColor Reference color.
* @param foregroundColors Candidates colors.
* @returns Find among `foregroundColors` the one that has the most contrast with `backgroundColor`.
*/
static bestContrast(backgroundColor, ...foregroundColors) {
const bgColor = new Color(backgroundColor);
const bgLightness = bgColor.perceivedLightness;
const fgColors = foregroundColors.map((color) => new Color(color));
const fgLightnesses = fgColors.map((color) => color.perceivedLightness);
let bestIndex = 0;
let bestContrast = Math.abs(bgLightness - fgLightnesses[0]);
for (let index = 1; index < fgColors.length; index++) {
const contrast = Math.abs(bgLightness - fgLightnesses[index]);
if (contrast > bestContrast) {
bestIndex = index;
bestContrast = contrast;
}
}
return fgColors[bestIndex];
}
constructor(colorSource) {
this.R = 0;
this.G = 0;
this.B = 0;
this.H = 0;
this.S = 0;
this.L = 0;
this.A = 0;
this.from(colorSource);
}
from(colorSource) {
if (typeof colorSource === "string") {
const ctx = Color.ctx;
ctx.clearRect(0, 0, 1, 1);
ctx.fillStyle = colorSource;
ctx.fillRect(0, 0, 1, 1);
const img = ctx.getImageData(0, 0, 1, 1);
const [r, g, b, a] = img.data;
const factor = 1 / 255;
this.R = r * factor;
this.G = g * factor;
this.B = b * factor;
this.A = a * factor;
}
else {
this.R = colorSource.R;
this.G = colorSource.G;
this.B = colorSource.B;
this.A = colorSource.A;
}
return this;
}
toString() {
const c = (value) => Math.floor(255 * value)
.toString(16)
.padStart(2, "0");
return `#${c(this.R)}${c(this.G)}${c(this.B)}${c(this.A)}`;
}
get luminance() {
return (0.2126 * this.sRgbToLinear(this.R) +
0.7152 * this.sRgbToLinear(this.G) +
0.0722 * this.sRgbToLinear(this.B));
}
get perceivedLightness() {
const Y = this.luminance;
return ((Y <= 216 / 24389
? Y * (24389 / 27)
: Math.pow(Y, 1 / 3) * 116 - 16) * 1e-2);
}
/**
* Remove gamma from sRGB component.
*/
sRgbToLinear(value) {
return value < 0.04045
? value / 12.92
: Math.pow((value + 0.055) / 1.055, 2.4);
}
isLight() {
return !this.isDark();
}
isDark() {
return this.perceivedLightness < 0.5;
}
rgb2hsl() {
const R = this.R;
const G = this.G;
const B = this.B;
const min = Math.min(R, G, B);
const max = Math.max(R, G, B);
const delta = max - min;
this.L = 0.5 * (max + min);
if (delta < 1e-6) {
this.H = 0;
this.S = 0;
}
else {
this.S = delta / (1 - Math.abs(this.L + this.L - 1));
if (max === R) {
this.H =
G >= B
? INV_6 * ((G - B) / delta)
: INV_6 * ((B - G) / delta);
}
else if (max === G) {
this.H = INV_6 * (2 + (B - R) / delta);
}
else {
this.H = INV_6 * (4 + (R - G) / delta);
}
}
}
/**
* @see https://en.wikipedia.org/wiki/HSL_and_HSV#Converting_to_RGB
*/
hsl2rgb() {
const H = 6 * this.H;
const S = this.S;
const L = this.L;
const chroma = (1 - Math.abs(L + L - 1)) * S;
const x = chroma * (1 - Math.abs((H % 2) - 1));
let R = 0;
let G = 0;
let B = 0;
if (H < 3) {
if (H < 1) {
R = chroma;
G = x;
B = 0;
}
else if (H < 2) {
R = x;
G = chroma;
B = 0;
}
else {
// H == 2.
R = 0;
G = chroma;
B = x;
}
}
else if (H < 4) {
R = 0;
G = x;
B = chroma;
}
else if (H < 5) {
R = x;
G = 0;
B = chroma;
}
else {
R = chroma;
G = 0;
B = x;
}
const shift = L - chroma * 0.5;
this.R = R + shift;
this.G = G + shift;
this.B = B + shift;
return this;
}
}
Color._ctx = null;
export default Color;
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