Function hslToRgb

apps/sim/lib/colors/convert.ts:61–89

(h: number, s: number, l: number)

/** Convert HSL (h: 0-360, s: 0-1, l: 0-1) to RGB (0-255). */
export function hslToRgb(h: number, s: number, l: number): { r: number; g: number; b: number } {
  h = ((h % 360) + 360) % 360
  s = Math.max(0, Math.min(1, s))
  l = Math.max(0, Math.min(1, l))

  if (s === 0) {
    const v = Math.round(l * 255)
    return { r: v, g: v, b: v }
  }

  const hueToRgb = (p: number, q: number, t: number): number => {
    if (t < 0) t += 1
    if (t > 1) t -= 1
    if (t < 1 / 6) return p + (q - p) * 6 * t
    if (t < 1 / 2) return q
    if (t < 2 / 3) return p + (q - p) * (2 / 3 - t) * 6
    return p
  }

  const q = l < 0.5 ? l * (1 + s) : l + s - l * s
  const p = 2 * l - q
  const hNorm = h / 360

  return {
    r: Math.round(hueToRgb(p, q, hNorm + 1 / 3) * 255),
    g: Math.round(hueToRgb(p, q, hNorm) * 255),
    b: Math.round(hueToRgb(p, q, hNorm - 1 / 3) * 255),
  }
}

/**
 * Render a resolved color + alpha as a CSS color string: the bare hex when