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import type { HexColor, OklchColor } from "./types"
export function hexToRgb(hex: HexColor): { r: number; g: number; b: number } {
const h = hex.replace("#", "")
const full =
h.length === 3
? h
.split("")
.map((c) => c + c)
.join("")
: h
const num = parseInt(full, 16)
return {
r: ((num >> 16) & 255) / 255,
g: ((num >> 8) & 255) / 255,
b: (num & 255) / 255,
}
}
export function rgbToHex(r: number, g: number, b: number): HexColor {
const toHex = (v: number) => {
const clamped = Math.max(0, Math.min(1, v))
const int = Math.round(clamped * 255)
return int.toString(16).padStart(2, "0")
}
return `#${toHex(r)}${toHex(g)}${toHex(b)}`
}
function linearToSrgb(c: number): number {
if (c <= 0.0031308) return c * 12.92
return 1.055 * Math.pow(c, 1 / 2.4) - 0.055
}
function srgbToLinear(c: number): number {
if (c <= 0.04045) return c / 12.92
return Math.pow((c + 0.055) / 1.055, 2.4)
}
export function rgbToOklch(r: number, g: number, b: number): OklchColor {
const lr = srgbToLinear(r)
const lg = srgbToLinear(g)
const lb = srgbToLinear(b)
const l_ = 0.4122214708 * lr + 0.5363325363 * lg + 0.0514459929 * lb
const m_ = 0.2119034982 * lr + 0.6806995451 * lg + 0.1073969566 * lb
const s_ = 0.0883024619 * lr + 0.2817188376 * lg + 0.6299787005 * lb
const l = Math.cbrt(l_)
const m = Math.cbrt(m_)
const s = Math.cbrt(s_)
const L = 0.2104542553 * l + 0.793617785 * m - 0.0040720468 * s
const a = 1.9779984951 * l - 2.428592205 * m + 0.4505937099 * s
const bOk = 0.0259040371 * l + 0.7827717662 * m - 0.808675766 * s
const C = Math.sqrt(a * a + bOk * bOk)
let H = Math.atan2(bOk, a) * (180 / Math.PI)
if (H < 0) H += 360
return { l: L, c: C, h: H }
}
export function oklchToRgb(oklch: OklchColor): { r: number; g: number; b: number } {
const { l: L, c: C, h: H } = oklch
const a = C * Math.cos((H * Math.PI) / 180)
const b = C * Math.sin((H * Math.PI) / 180)
const l = L + 0.3963377774 * a + 0.2158037573 * b
const m = L - 0.1055613458 * a - 0.0638541728 * b
const s = L - 0.0894841775 * a - 1.291485548 * b
const l3 = l * l * l
const m3 = m * m * m
const s3 = s * s * s
const lr = 4.0767416621 * l3 - 3.3077115913 * m3 + 0.2309699292 * s3
const lg = -1.2684380046 * l3 + 2.6097574011 * m3 - 0.3413193965 * s3
const lb = -0.0041960863 * l3 - 0.7034186147 * m3 + 1.707614701 * s3
return {
r: linearToSrgb(lr),
g: linearToSrgb(lg),
b: linearToSrgb(lb),
}
}
export function hexToOklch(hex: HexColor): OklchColor {
const { r, g, b } = hexToRgb(hex)
return rgbToOklch(r, g, b)
}
export function oklchToHex(oklch: OklchColor): HexColor {
const { r, g, b } = oklchToRgb(oklch)
return rgbToHex(r, g, b)
}
export function generateScale(seed: HexColor, isDark: boolean): HexColor[] {
const base = hexToOklch(seed)
const scale: HexColor[] = []
const lightSteps = isDark
? [0.15, 0.18, 0.22, 0.26, 0.32, 0.38, 0.46, 0.56, base.l, base.l - 0.05, 0.75, 0.93]
: [0.99, 0.97, 0.94, 0.9, 0.85, 0.79, 0.72, 0.64, base.l, base.l + 0.05, 0.45, 0.25]
const chromaMultipliers = isDark
? [0.15, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.85, 1, 1, 0.9, 0.6]
: [0.1, 0.15, 0.25, 0.35, 0.45, 0.55, 0.7, 0.85, 1, 1, 0.95, 0.85]
for (let i = 0; i < 12; i++) {
scale.push(
oklchToHex({
l: lightSteps[i],
c: base.c * chromaMultipliers[i],
h: base.h,
}),
)
}
return scale
}
export function generateNeutralScale(seed: HexColor, isDark: boolean): HexColor[] {
const base = hexToOklch(seed)
const scale: HexColor[] = []
const neutralChroma = Math.min(base.c, 0.02)
const lightSteps = isDark
? [0.13, 0.16, 0.2, 0.24, 0.28, 0.33, 0.4, 0.52, 0.58, 0.66, 0.82, 0.96]
: [0.995, 0.98, 0.96, 0.94, 0.91, 0.88, 0.84, 0.78, 0.62, 0.56, 0.46, 0.2]
for (let i = 0; i < 12; i++) {
scale.push(
oklchToHex({
l: lightSteps[i],
c: neutralChroma,
h: base.h,
}),
)
}
return scale
}
export function generateAlphaScale(scale: HexColor[], isDark: boolean): HexColor[] {
const alphas = isDark
? [0.02, 0.04, 0.08, 0.12, 0.16, 0.2, 0.26, 0.36, 0.44, 0.52, 0.76, 0.96]
: [0.01, 0.03, 0.06, 0.09, 0.12, 0.15, 0.2, 0.28, 0.48, 0.56, 0.64, 0.88]
return scale.map((hex, i) => {
const { r, g, b } = hexToRgb(hex)
const a = alphas[i]
const bg = isDark ? 0 : 1
const blendedR = r * a + bg * (1 - a)
const blendedG = g * a + bg * (1 - a)
const blendedB = b * a + bg * (1 - a)
return rgbToHex(blendedR, blendedG, blendedB)
})
}
export function mixColors(color1: HexColor, color2: HexColor, amount: number): HexColor {
const c1 = hexToOklch(color1)
const c2 = hexToOklch(color2)
return oklchToHex({
l: c1.l + (c2.l - c1.l) * amount,
c: c1.c + (c2.c - c1.c) * amount,
h: c1.h + (c2.h - c1.h) * amount,
})
}
export function lighten(color: HexColor, amount: number): HexColor {
const oklch = hexToOklch(color)
return oklchToHex({
...oklch,
l: Math.min(1, oklch.l + amount),
})
}
export function darken(color: HexColor, amount: number): HexColor {
const oklch = hexToOklch(color)
return oklchToHex({
...oklch,
l: Math.max(0, oklch.l - amount),
})
}
export function withAlpha(color: HexColor, alpha: number): string {
const { r, g, b } = hexToRgb(color)
return `rgba(${Math.round(r * 255)}, ${Math.round(g * 255)}, ${Math.round(b * 255)}, ${alpha})`
}
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