Extend it: skills, UI, and computer use

The seams LegalWork is meant to be extended through — authoring new skills, the shared UI primitives, and the native automation runtime — ending in real code.
packages/ui/src/common/paper.ts500 lines · getSeededPaperMeshGradientConfig L129–154
Outline 29 symbolsPaperMeshGradientConfig type export
PaperGrainGradientConfig type export
SeededPaperOption type export
paperMeshGradientDefaults const export
paperGrainGradientDefaults const export
grainShapes const
meshPaletteFamilies const
grainPaletteFamilies const
paletteModes const
MeshGradientOverrides type
GrainGradientOverrides type
getSeededPaperMeshGradientConfig function export
getSeededPaperGrainGradientConfig function export
resolvePaperMeshGradientConfig function export
resolvePaperGrainGradientConfig function export
buildSeedSource function
createSeededPalette function
createSeededBackground function
adjustHexColor function
mixHexColors function
createRandom function
hashString function
mulberry32 function
clamp function
roundTo function
hexToRgb function
rgbToHsl function
hslToHex function
rgbToHex function
1import type {
GrainGradientParams,
GrainGradientShape,
MeshGradientParams,
5} from "@paper-design/shaders";
6
7export type PaperMeshGradientConfig = Required<
Pick<
  MeshGradientParams,
  | "colors"
  | "distortion"
  | "swirl"
  | "grainMixer"
  | "grainOverlay"
  | "speed"
  | "frame"
>
18>;
19
20export type PaperGrainGradientConfig = Required<
Pick<
  GrainGradientParams,
  | "colorBack"
  | "colors"
  | "softness"
  | "intensity"
  | "noise"
  | "shape"
  | "speed"
  | "frame"
>
32>;
33
34export type SeededPaperOption = {
seed?: string;
36};
37
38export const paperMeshGradientDefaults: PaperMeshGradientConfig = {
colors: ["#e0eaff", "#241d9a", "#f75092", "#9f50d3"],
distortion: 0.8,
swirl: 0.1,
grainMixer: 0,
grainOverlay: 0,
speed: 0.1,
frame: 0,
46};
47
48export const paperGrainGradientDefaults: PaperGrainGradientConfig = {
colors: ["#7300ff", "#eba8ff", "#00bfff", "#2b00ff"],
colorBack: "#000000",
softness: 0.5,
intensity: 0.5,
noise: 0.25,
shape: "ripple",
speed: 0.4,
frame: 0,
57};
58
59const grainShapes: GrainGradientShape[] = [
"corners",
"wave",
"dots",
"truchet",
"ripple",
"blob",
"sphere",
67];
68
69const meshPaletteFamilies = [
["#e0eaff", "#241d9a", "#f75092", "#9f50d3"],
["#ddfff5", "#006c67", "#35d8c0", "#8cff7a"],
["#ffe5c2", "#8a2500", "#ff7b39", "#ffd166"],
["#f5f7ff", "#0d1b52", "#3f8cff", "#00c2ff"],
["#fff2f2", "#6f1237", "#ff4d6d", "#ffb703"],
["#f0ffe1", "#254d00", "#8cc63f", "#00a76f"],
["#f5edff", "#44206b", "#b5179e", "#7209b7"],
["#f4f1ea", "#3a2f1f", "#927c55", "#d0c2a8"],
78];
79
80const grainPaletteFamilies = [
["#7300ff", "#eba8ff", "#00bfff", "#2b00ff"],
["#0df2c1", "#0b7cff", "#74efff", "#1a2cff"],
["#ff7a18", "#ffd166", "#ff4d6d", "#5f0f40"],
["#8dff6a", "#1f7a1f", "#d7ff70", "#00c48c"],
["#f6a6ff", "#7027c9", "#ff66c4", "#20115b"],
["#b9ecff", "#006494", "#00a6a6", "#072ac8"],
["#f7f0d6", "#8c5e34", "#d68c45", "#4e342e"],
["#ffd9f5", "#ff006e", "#8338ec", "#3a0ca3"],
89];
90
91const paletteModes = [
{
  hueOffsets: [0, 22, 182, 238],
  saturations: [0.92, 0.7, 0.84, 0.74],
  lightnesses: [0.82, 0.28, 0.6, 0.5],
},
{
  hueOffsets: [0, 118, 242, 304],
  saturations: [0.88, 0.76, 0.82, 0.7],
  lightnesses: [0.8, 0.42, 0.58, 0.48],
},
{
  hueOffsets: [0, 44, 156, 214],
  saturations: [0.94, 0.78, 0.86, 0.72],
  lightnesses: [0.78, 0.4, 0.6, 0.46],
},
{
  hueOffsets: [0, 76, 184, 326],
  saturations: [0.86, 0.8, 0.78, 0.76],
  lightnesses: [0.82, 0.52, 0.42, 0.58],
},
{
  hueOffsets: [0, 140, 196, 224],
  saturations: [0.84, 0.7, 0.76, 0.88],
  lightnesses: [0.86, 0.46, 0.36, 0.54],
},
{
  hueOffsets: [0, 162, 212, 342],
  saturations: [0.9, 0.72, 0.8, 0.82],
  lightnesses: [0.8, 0.38, 0.52, 0.56],
},
122];
123
124type MeshGradientOverrides = SeededPaperOption &
Partial<PaperMeshGradientConfig>;
126type GrainGradientOverrides = SeededPaperOption &
Partial<PaperGrainGradientConfig>;
128
129export function getSeededPaperMeshGradientConfig(
seed: string,
131): PaperMeshGradientConfig {
const random = createRandom(seed, "mesh");
133
return {
  colors: createSeededPalette(
    paperMeshGradientDefaults.colors,
    seed,
    "mesh-colors",
    {
      families: meshPaletteFamilies,
      hueShift: 42,
      saturationShift: 0.18,
      lightnessShift: 0.14,
      baseBlend: [0.08, 0.2],
    },
  ),
  distortion: roundTo(clamp(0.58 + random() * 0.32, 0, 1), 3),
  swirl: roundTo(clamp(0.03 + random() * 0.28, 0, 1), 3),
  grainMixer: roundTo(clamp(random() * 0.18, 0, 1), 3),
  grainOverlay: roundTo(clamp(random() * 0.12, 0, 1), 3),
  speed: 0.5,
  frame: Math.round(random() * 240000),
};
154}
155
156export function getSeededPaperGrainGradientConfig(
seed: string,
158): PaperGrainGradientConfig {
const random = createRandom(seed, "grain");
const colors = createSeededPalette(
  paperGrainGradientDefaults.colors,
  seed,
  "grain-colors",
  {
    families: grainPaletteFamilies,
    hueShift: 58,
    saturationShift: 0.22,
    lightnessShift: 0.18,
    baseBlend: [0.04, 0.14],
  },
);
const anchorColor = colors[Math.floor(random() * colors.length)] ?? colors[0];
173
return {
  colors,
  colorBack: createSeededBackground(anchorColor, seed, "grain-background"),
  softness: roundTo(clamp(0.22 + random() * 0.56, 0, 1), 3),
  intensity: roundTo(clamp(0.2 + random() * 0.6, 0, 1), 3),
  noise: roundTo(clamp(0.12 + random() * 0.34, 0, 1), 3),
  shape:
    grainShapes[Math.floor(random() * grainShapes.length)] ??
    paperGrainGradientDefaults.shape,
  speed: roundTo(0.2 + random() * 0.6, 3),
  frame: Math.round(random() * 320000),
};
186}
187
188export function resolvePaperMeshGradientConfig(
options: MeshGradientOverrides = {},
190): PaperMeshGradientConfig {
const seeded = options.seed
  ? getSeededPaperMeshGradientConfig(options.seed)
  : paperMeshGradientDefaults;
194
return {
  colors: options.colors ?? seeded.colors,
  distortion: options.distortion ?? seeded.distortion,
  swirl: options.swirl ?? seeded.swirl,
  grainMixer: options.grainMixer ?? seeded.grainMixer,
  grainOverlay: options.grainOverlay ?? seeded.grainOverlay,
  speed: options.speed ?? seeded.speed,
  frame: options.frame ?? seeded.frame,
};
204}
205
206export function resolvePaperGrainGradientConfig(
options: GrainGradientOverrides = {},
208): PaperGrainGradientConfig {
const seeded = options.seed
  ? getSeededPaperGrainGradientConfig(options.seed)
  : paperGrainGradientDefaults;
212
return {
  colors: options.colors ?? seeded.colors,
  colorBack: options.colorBack ?? seeded.colorBack,
  softness: options.softness ?? seeded.softness,
  intensity: options.intensity ?? seeded.intensity,
  noise: options.noise ?? seeded.noise,
  shape: options.shape ?? seeded.shape,
  speed: options.speed ?? seeded.speed,
  frame: options.frame ?? seeded.frame,
};
223}
224
225function buildSeedSource(seed: string) {
const trimmedSeed = seed.trim();
const separatorIndex = trimmedSeed.indexOf("_");
228
if (separatorIndex === -1) {
  return trimmedSeed;
}
232
const prefix = trimmedSeed.slice(0, separatorIndex);
const suffix = trimmedSeed.slice(separatorIndex + 1);
const suffixTail = suffix.slice(5) || suffix;
236
return `${trimmedSeed}|${prefix}|${suffix}|${suffixTail}`;
238}
239
240function createSeededPalette(
baseColors: string[],
seed: string,
namespace: string,
options: {
  families: string[][];
  hueShift: number;
  saturationShift: number;
  lightnessShift: number;
  baseBlend: [number, number];
},
251) {
const familyRandom = createRandom(seed, `${namespace}:family`);
const primaryIndex = Math.floor(familyRandom() * options.families.length);
const secondaryOffset =
  1 + Math.floor(familyRandom() * (options.families.length - 1));
const secondaryIndex =
  (primaryIndex + secondaryOffset) % options.families.length;
const primary = options.families[primaryIndex] ?? baseColors;
const secondary =
  options.families[secondaryIndex] ?? [...baseColors].reverse();
const primaryShift = Math.floor(familyRandom() * primary.length);
const secondaryShift = Math.floor(familyRandom() * secondary.length);
const paletteMode =
  paletteModes[Math.floor(familyRandom() * paletteModes.length)] ??
  paletteModes[0];
const baseHue = familyRandom() * 360;
267
return baseColors.map((color, index) => {
  const random = createRandom(seed, `${namespace}:${index}`);
  const primaryColor =
    primary[(index + primaryShift) % primary.length] ?? color;
  const secondaryColor =
    secondary[(index + secondaryShift) % secondary.length] ?? primaryColor;
  const proceduralColor = hslToHex(
    (baseHue +
      paletteMode.hueOffsets[index % paletteMode.hueOffsets.length] +
      (random() * 2 - 1) * 18 +
      360) %
      360,
    clamp(
      paletteMode.saturations[index % paletteMode.saturations.length] +
        (random() * 2 - 1) * 0.08,
      0,
      1,
    ),
    clamp(
      paletteMode.lightnesses[index % paletteMode.lightnesses.length] +
        (random() * 2 - 1) * 0.08,
      0,
      1,
    ),
  );
  const mixedFamilyColor = mixHexColors(
    primaryColor,
    secondaryColor,
    0.18 + random() * 0.64,
  );
  const remixedFamilyColor = mixHexColors(
    mixedFamilyColor,
    primary[(index + secondaryShift + 1) % primary.length] ??
      mixedFamilyColor,
    random() * 0.32,
  );
  const proceduralFamilyColor = mixHexColors(
    proceduralColor,
    remixedFamilyColor,
    0.22 + random() * 0.34,
  );
  const [minBaseBlend, maxBaseBlend] = options.baseBlend;
  const blendedBaseColor = mixHexColors(
    proceduralFamilyColor,
    color,
    minBaseBlend + random() * (maxBaseBlend - minBaseBlend),
  );
315
  return adjustHexColor(blendedBaseColor, {
    hueShift: (random() * 2 - 1) * options.hueShift + (random() * 2 - 1) * 14,
    saturationShift: (random() * 2 - 1) * options.saturationShift + 0.06,
    lightnessShift: (random() * 2 - 1) * options.lightnessShift,
  });
});
322}
323
324function createSeededBackground(
baseColor: string,
seed: string,
namespace: string,
328) {
const [red, green, blue] = hexToRgb(baseColor);
const [hue] = rgbToHsl(red, green, blue);
const random = createRandom(seed, namespace);
332
return hslToHex(
  hue,
  clamp(0.18 + random() * 0.18, 0, 1),
  clamp(0.03 + random() * 0.09, 0, 1),
);
338}
339
340function adjustHexColor(
hex: string,
adjustments: {
  hueShift: number;
  saturationShift: number;
  lightnessShift: number;
},
347) {
const [red, green, blue] = hexToRgb(hex);
const [hue, saturation, lightness] = rgbToHsl(red, green, blue);
350
return hslToHex(
  (hue + adjustments.hueShift + 360) % 360,
  clamp(saturation + adjustments.saturationShift, 0, 1),
  clamp(lightness + adjustments.lightnessShift, 0, 1),
);
356}
357
358function mixHexColors(colorA: string, colorB: string, amount: number) {
const [redA, greenA, blueA] = hexToRgb(colorA);
const [redB, greenB, blueB] = hexToRgb(colorB);
const mixAmount = clamp(amount, 0, 1);
362
return rgbToHex(
  Math.round(redA + (redB - redA) * mixAmount),
  Math.round(greenA + (greenB - greenA) * mixAmount),
  Math.round(blueA + (blueB - blueA) * mixAmount),
);
368}
369
370function createRandom(seed: string, namespace: string) {
return mulberry32(hashString(`${buildSeedSource(seed)}::${namespace}`));
372}
373
374function hashString(input: string) {
let hash = 2166136261;
376
for (let index = 0; index < input.length; index += 1) {
  hash ^= input.charCodeAt(index);
  hash = Math.imul(hash, 16777619);
}
381
return hash >>> 0;
383}
384
385function mulberry32(seed: number) {
return function nextRandom() {
  let value = (seed += 0x6d2b79f5);
  value = Math.imul(value ^ (value >>> 15), value | 1);
  value ^= value + Math.imul(value ^ (value >>> 7), value | 61);
  return ((value ^ (value >>> 14)) >>> 0) / 4294967296;
};
392}
393
394function clamp(value: number, min: number, max: number) {
return Math.min(max, Math.max(min, value));
396}
397
398function roundTo(value: number, precision: number) {
const power = 10 ** precision;
return Math.round(value * power) / power;
401}
402
403function hexToRgb(hex: string): [number, number, number] {
const normalized = hex.replace(/^#/, "");
const expanded =
  normalized.length === 3
    ? normalized
        .split("")
        .map((part) => `${part}${part}`)
        .join("")
    : normalized;
412
if (expanded.length !== 6) {
  throw new Error(`Unsupported hex color: ${hex}`);
}
416
const value = Number.parseInt(expanded, 16);
418
return [(value >> 16) & 255, (value >> 8) & 255, value & 255];
420}
421
422function rgbToHsl(
red: number,
green: number,
blue: number,
426): [number, number, number] {
const normalizedRed = red / 255;
const normalizedGreen = green / 255;
const normalizedBlue = blue / 255;
const max = Math.max(normalizedRed, normalizedGreen, normalizedBlue);
const min = Math.min(normalizedRed, normalizedGreen, normalizedBlue);
const lightness = (max + min) / 2;
433
if (max === min) {
  return [0, 0, lightness];
}
437
const delta = max - min;
const saturation =
  lightness > 0.5 ? delta / (2 - max - min) : delta / (max + min);
441
let hue = 0;
443
switch (max) {
  case normalizedRed:
    hue =
      (normalizedGreen - normalizedBlue) / delta +
      (normalizedGreen < normalizedBlue ? 6 : 0);
    break;
  case normalizedGreen:
    hue = (normalizedBlue - normalizedRed) / delta + 2;
    break;
  default:
    hue = (normalizedRed - normalizedGreen) / delta + 4;
    break;
}
457
return [hue * 60, saturation, lightness];
459}
460
461function hslToHex(hue: number, saturation: number, lightness: number) {
if (saturation === 0) {
  const value = Math.round(lightness * 255);
  return rgbToHex(value, value, value);
}
466
const hueToRgb = (p: number, q: number, t: number) => {
  let normalizedT = t;
469
  if (normalizedT < 0) normalizedT += 1;
  if (normalizedT > 1) normalizedT -= 1;
  if (normalizedT < 1 / 6) return p + (q - p) * 6 * normalizedT;
  if (normalizedT < 1 / 2) return q;
  if (normalizedT < 2 / 3) return p + (q - p) * (2 / 3 - normalizedT) * 6;
  return p;
};
477
const normalizedHue = hue / 360;
const q =
  lightness < 0.5
    ? lightness * (1 + saturation)
    : lightness + saturation - lightness * saturation;
const p = 2 * lightness - q;
const red = hueToRgb(p, q, normalizedHue + 1 / 3);
const green = hueToRgb(p, q, normalizedHue);
const blue = hueToRgb(p, q, normalizedHue - 1 / 3);
487
return rgbToHex(
  Math.round(red * 255),
  Math.round(green * 255),
  Math.round(blue * 255),
);
493}
494
495function rgbToHex(red: number, green: number, blue: number) {
return `#${[red, green, blue]
  .map((value) => value.toString(16).padStart(2, "0"))
  .join("")}`;
499}
500
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