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const HUE_MAX = 360;
const SV_MAX = 100;
export type ObjectColor = RgbColor | HslColor | HsvColor | RgbaColor | HslaColor | HsvaColor;
export type ColorResult = {
rgb: RgbColor;
hsl: HslColor;
hsv: HsvColor;
rgba: RgbaColor;
hsla: HslaColor;
hsva: HsvaColor;
xy: XYColor;
hex: string;
hexa: string;
};
export interface HsvColor {
h: number;
s: number;
v: number;
}
export interface HsvaColor extends HsvColor {
a: number;
}
export interface RgbColor {
r: number;
g: number;
b: number;
}
export interface RgbaColor extends RgbColor {
a: number;
}
export interface XYColor {
x: number;
y: number;
bri?: number;
}
/**
* ```js
* rgbaToHsva({ r: 255, g: 255, b: 255, a: 1 }) //=> { h: 0, s: 0, v: 100, a: 1 }
* ```
*/
export const rgbaToHsva = ({ r, g, b, a }: RgbaColor): HsvaColor => {
const max = Math.max(r, g, b);
const delta = max - Math.min(r, g, b);
// prettier-ignore
const hh = delta
? max === r
? (g - b) / delta
: max === g
? 2 + (b - r) / delta
: 4 + (r - g) / delta
: 0;
return {
h: 60 * (hh < 0 ? hh + 6 : hh),
s: max ? (delta / max) * SV_MAX : 0,
v: (max / RGB_MAX) * SV_MAX,
a,
};
};
export const hsvaToHslString = (hsva: HsvaColor): string => {
const { h, s, l } = hsvaToHsla(hsva);
// return `hsl(${h}, ${s}%, ${l}%)`;
return `hsl(${h}, ${Math.round(s)}%, ${Math.round(l)}%)`;
};
export const hsvaToHsvString = ({ h, s, v }: HsvaColor): string => {
return `hsv(${h}, ${s}%, ${v}%)`;
};
export const hsvaToHsvaString = ({ h, s, v, a }: HsvaColor): string => {
return `hsva(${h}, ${s}%, ${v}%, ${a})`;
};
export const hsvaToHslaString = (hsva: HsvaColor): string => {
const { h, s, l, a } = hsvaToHsla(hsva);
return `hsla(${h}, ${s}%, ${l}%, ${a})`;
};
export const hslStringToHsla = (str: string): HslaColor => {
const [h, s, l, a] = (str.match(/\d+/g) || []).map(Number);
return { h, s, l, a };
};
export const hslaStringToHsva = (hslString: string): HsvaColor => {
const matcher =
/hsla?\(?\s*(-?\d*\.?\d+)(deg|rad|grad|turn)?[,\s]+(-?\d*\.?\d+)%?[,\s]+(-?\d*\.?\d+)%?,?\s*[/\s]*(-?\d*\.?\d+)?(%)?\s*\)?/i;
const match = matcher.exec(hslString);
if (!match) return { h: 0, s: 0, v: 0, a: 1 };
return hslaToHsva({
h: parseHue(match[1], match[2]),
s: Number(match[3]),
l: Number(match[4]),
a: match[5] === undefined ? 1 : Number(match[5]) / (match[6] ? 100 : 1),
});
};
export const hslStringToHsva = hslaStringToHsva;
export const hslaToHsva = ({ h, s, l, a }: HslaColor): HsvaColor => {
s *= (l < 50 ? l : SV_MAX - l) / SV_MAX;
return {
h: h,
s: s > 0 ? ((2 * s) / (l + s)) * SV_MAX : 0,
v: l + s,
a,
};
};
export interface HslColor {
h: number;
s: number;
l: number;
}
export interface HslaColor extends HslColor {
a: number;
}
export const hsvaToHsla = ({ h, s, v, a }: HsvaColor): HslaColor => {
const hh = ((200 - s) * v) / SV_MAX;
return {
h,
s: hh > 0 && hh < 200 ? ((s * v) / SV_MAX / (hh <= SV_MAX ? hh : 200 - hh)) * SV_MAX : 0,
l: hh / 2,
a,
};
};
export const hsvaStringToHsva = (hsvString: string): HsvaColor => {
const matcher =
/hsva?\(?\s*(-?\d*\.?\d+)(deg|rad|grad|turn)?[,\s]+(-?\d*\.?\d+)%?[,\s]+(-?\d*\.?\d+)%?,?\s*[/\s]*(-?\d*\.?\d+)?(%)?\s*\)?/i;
const match = matcher.exec(hsvString);
if (!match) return { h: 0, s: 0, v: 0, a: 1 };
return {
h: parseHue(match[1], match[2]),
s: Number(match[3]),
v: Number(match[4]),
a: match[5] === undefined ? 1 : Number(match[5]) / (match[6] ? SV_MAX : 1),
};
};
/**
* Valid CSS <angle> units.
* https://developer.mozilla.org/en-US/docs/Web/CSS/angle
*/
const angleUnits: Record<string, number> = {
grad: HUE_MAX / 400,
turn: HUE_MAX,
rad: HUE_MAX / (Math.PI * 2),
};
export const parseHue = (value: string, unit = 'deg'): number => {
return Number(value) * (angleUnits[unit] || 1);
};
export const hsvStringToHsva = hsvaStringToHsva;
export const rgbaStringToHsva = (rgbaString: string): HsvaColor => {
const matcher =
/rgba?\(?\s*(-?\d*\.?\d+)(%)?[,\s]+(-?\d*\.?\d+)(%)?[,\s]+(-?\d*\.?\d+)(%)?,?\s*[/\s]*(-?\d*\.?\d+)?(%)?\s*\)?/i;
const match = matcher.exec(rgbaString);
if (!match) return { h: 0, s: 0, v: 0, a: 1 };
return rgbaToHsva({
r: Number(match[1]) / (match[2] ? SV_MAX / RGB_MAX : 1),
g: Number(match[3]) / (match[4] ? SV_MAX / RGB_MAX : 1),
b: Number(match[5]) / (match[6] ? SV_MAX / RGB_MAX : 1),
a: match[7] === undefined ? 1 : Number(match[7]) / (match[8] ? SV_MAX : 1),
});
};
export const rgbStringToHsva = rgbaStringToHsva;
/** Converts an RGBA color plus alpha transparency to hex */
export const rgbaToHex = ({ r, g, b }: RgbaColor): string => {
const bin = (r << 16) | (g << 8) | b;
return `#${((h) => new Array(7 - h.length).join('0') + h)(bin.toString(16))}`;
};
export const rgbaToHexa = ({ r, g, b, a }: RgbaColor): string => {
const alpha = typeof a === 'number' && ((a * 255) | (1 << 8)).toString(16).slice(1);
return `${rgbaToHex({ r, g, b, a })}${alpha ? alpha : ''}`;
};
export type HexColor = `#${string}`;
export const hexToHsva = (hex: string): HsvaColor => rgbaToHsva(hexToRgba(hex));
export const hexToRgba = (hex: string): RgbaColor => {
const htemp = hex.replace('#', '');
if (/^#?/.test(hex) && htemp.length === 3) {
hex = `#${htemp.charAt(0)}${htemp.charAt(0)}${htemp.charAt(1)}${htemp.charAt(1)}${htemp.charAt(2)}${htemp.charAt(2)}`;
}
const reg = new RegExp(`[A-Za-z0-9]{2}`, 'g');
const [r, g, b = 0, a] = hex.match(reg)!.map((v) => parseInt(v, 16));
return {
r,
g,
b,
a: (a ?? 255) / RGB_MAX,
};
};
/**
* Converts HSVA to RGBA. Based on formula from https://en.wikipedia.org/wiki/HSL_and_HSV
* @param color HSVA color as an array [0-360, 0-1, 0-1, 0-1]
*/
export const hsvaToRgba = ({ h, s, v, a }: HsvaColor): RgbaColor => {
let _h = h / 60,
_s = s / SV_MAX,
_v = v / SV_MAX,
hi = Math.floor(_h) % 6;
let f = _h - Math.floor(_h),
_p = RGB_MAX * _v * (1 - _s),
_q = RGB_MAX * _v * (1 - _s * f),
_t = RGB_MAX * _v * (1 - _s * (1 - f));
_v *= RGB_MAX;
const rgba = {} as RgbaColor;
switch (hi) {
case 0:
rgba.r = _v;
rgba.g = _t;
rgba.b = _p;
break;
case 1:
rgba.r = _q;
rgba.g = _v;
rgba.b = _p;
break;
case 2:
rgba.r = _p;
rgba.g = _v;
rgba.b = _t;
break;
case 3:
rgba.r = _p;
rgba.g = _q;
rgba.b = _v;
break;
case 4:
rgba.r = _t;
rgba.g = _p;
rgba.b = _v;
break;
case 5:
rgba.r = _v;
rgba.g = _p;
rgba.b = _q;
break;
}
rgba.r = Math.round(rgba.r);
rgba.g = Math.round(rgba.g);
rgba.b = Math.round(rgba.b);
return { ...rgba, a };
};
export const hsvaToRgbString = (hsva: HsvaColor): string => {
const { r, g, b } = hsvaToRgba(hsva);
return `rgb(${r}, ${g}, ${b})`;
};
export const hsvaToRgbaString = (hsva: HsvaColor): string => {
const { r, g, b, a } = hsvaToRgba(hsva);
return `rgba(${r}, ${g}, ${b}, ${a})`;
};
export const rgbaToRgb = ({ r, g, b }: RgbaColor): RgbColor => ({ r, g, b });
export const hslaToHsl = ({ h, s, l }: HslaColor): HslColor => ({ h, s, l });
export const hsvaToHex = (hsva: HsvaColor): string => rgbaToHex(hsvaToRgba(hsva));
export const hsvaToHexa = (hsva: HsvaColor): string => rgbaToHexa(hsvaToRgba(hsva));
export const hsvaToHsv = ({ h, s, v }: HsvaColor): HsvColor => ({ h, s, v });
export const hexToXY = (hex: string): XYColor => rgbToXY(rgbaToRgb(hexToRgba(hex)));
export const xyToHex = (xy: XYColor): string =>
rgbaToHex({
...xyToRgb(xy),
a: 255,
});
/**
* Converts XY to RGB. Based on formula from https://developers.meethue.com/develop/application-design-guidance/color-conversion-formulas-rgb-to-xy-and-back/
* @param color XY color and brightness as an array [0-1, 0-1, 0-1]
*/
export const xyToRgb = ({ x, y, bri = 255 }: XYColor): RgbColor => {
const red = x * 3.2406255 + y * -1.537208 + bri * -0.4986286;
const green = x * -0.9689307 + y * 1.8757561 + bri * 0.0415175;
const blue = x * 0.0557101 + y * -0.2040211 + bri * 1.0569959;
const translate = function (color: number) {
return color <= 0.0031308 ? 12.92 * color : 1.055 * Math.pow(color, 1 / 2.4) - 0.055;
};
return {
r: Math.round(255 * translate(red)),
g: Math.round(255 * translate(green)),
b: Math.round(255 * translate(blue)),
};
};
/**
* Converts RGB to XY. Based on formula from https://developers.meethue.com/develop/application-design-guidance/color-conversion-formulas-rgb-to-xy-and-back/
* @param color RGB color as an array [0-255, 0-255, 0-255]
*/
export const rgbToXY = ({ r, g, b }: RgbColor): XYColor => {
const translateColor = function (color: number) {
return color <= 0.04045 ? color / 12.92 : Math.pow((color + 0.055) / 1.055, 2.4);
};
const red = translateColor(r / 255);
const green = translateColor(g / 255);
const blue = translateColor(b / 255);
const xyz = {} as XYColor;
xyz.x = red * 0.4124 + green * 0.3576 + blue * 0.1805;
xyz.y = red * 0.2126 + green * 0.7152 + blue * 0.0722;
xyz.bri = red * 0.0193 + green * 0.1192 + blue * 0.9505;
return xyz;
};
export const color = (str: string | HsvaColor): ColorResult => {
let rgb!: RgbColor;
let hsl!: HslColor;
let hsv!: HsvColor;
let rgba!: RgbaColor;
let hsla!: HslaColor;
let hsva!: HsvaColor;
let xy!: XYColor;
let hex!: string;
let hexa!: string;
if (typeof str === 'string' && validHex(str)) {
hsva = hexToHsva(str);
hex = str;
} else if (typeof str !== 'string') {
hsva = str;
}
if (hsva) {
hsv = hsvaToHsv(hsva);
hsla = hsvaToHsla(hsva);
rgba = hsvaToRgba(hsva);
hexa = rgbaToHexa(rgba);
hex = hsvaToHex(hsva);
hsl = hslaToHsl(hsla);
rgb = rgbaToRgb(rgba);
xy = rgbToXY(rgb);
}
return { rgb, hsl, hsv, rgba, hsla, hsva, hex, hexa, xy };
};
export const getContrastingColor = (str: string | HsvaColor) => {
if (!str) {
return '#ffffff';
}
const col = color(str);
const yiq = (col.rgb.r * 299 + col.rgb.g * 587 + col.rgb.b * 114) / 1000;
return yiq >= 128 ? '#000000' : '#ffffff';
};
export const equalColorObjects = (first: ObjectColor, second: ObjectColor): boolean => {
if (first === second) return true;
for (const prop in first) {
// The following allows for a type-safe calling of this function (first & second have to be HSL, HSV, or RGB)
// with type-unsafe iterating over object keys. TS does not allow this without an index (`[key: string]: number`)
// on an object to define how iteration is normally done. To ensure extra keys are not allowed on our types,
// we must cast our object to unknown (as RGB demands `r` be a key, while `Record<string, x>` does not care if
// there is or not), and then as a type TS can iterate over.
if ((first as unknown as Record<string, number>)[prop] !== (second as unknown as Record<string, number>)[prop]) return false;
}
return true;
};
export const equalColorString = (first: string, second: string): boolean => {
return first.replace(/\s/g, '') === second.replace(/\s/g, '');
};
export const equalHex = (first: string, second: string): boolean => {
if (first.toLowerCase() === second.toLowerCase()) return true;
// To compare colors like `#FFF` and `ffffff` we convert them into RGB objects
return equalColorObjects(hexToRgba(first), hexToRgba(second));
};
export const validHex = (hex: string): hex is HexColor => /^#?([A-Fa-f0-9]{3,4}){1,2}$/.test(hex);
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