392 lines
11 KiB
TypeScript
392 lines
11 KiB
TypeScript
import * as R from './rand.js';
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const max = Math.max;
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const min = Math.min;
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export type Luma = number;
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export type Chroma = number;
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export type Hue = number;
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export type Alpha = number;
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export type HueDistance = number;
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const MAXL: Luma = 0.9;
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const MINL: Luma = 0.4;
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const MINL_LIGHT: Luma = 0.7;
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const MAXL_DARK: Luma = 0.65;
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const MINC_LIGHT: Chroma = 0.08;
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const MAXC_LIGHT: Chroma = 0.1;
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const MINC_DARK: Chroma = 0.12;
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const MAXC_DARK: Chroma = 0.175;
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// max spread for a sequence of analogous colors. unless that would put them
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// too close together
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const MAXH_WIDTH: HueDistance = 80;
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// minimum distance between adjacent analogous colors
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const MINH_SEP: HueDistance = 5;
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// size of the wedge a "complementary" color can be in
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const MAXH_COMPL: HueDistance = 40;
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// size of the wedge a "triadic" color can be in
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const MAXH_TRIAD: HueDistance = 25;
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type LD = 'light' | 'dark';
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export namespace Oklch {
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export type Channel = 'l' | 'c' | 'h';
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export type Channels = Record<Channel, number>;
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export type ChannelMap = (x: number) => number;
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export type ChannelMaps = Record<Channel, ChannelMap>;
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// a function, or constant value, for each channel;
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// or nothing, which indicates identity function
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export type With = Partial<Record<Channel, number | ChannelMap>>;
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export type With1 = ChannelMap | number | undefined;
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}
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function isLight(l: Luma): boolean { return l >= MINL_LIGHT; }
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export namespace Rand { export type State = R.State; }
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export class Rand extends R.Rand {
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constructor(seed?: R.State) { super(seed); }
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lightFor(baseL: Luma): Luma { return this.float(baseL, MAXL); }
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darkFor(baseL: Luma): Luma { return this.float(MINL, baseL); }
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brightFor(l: Luma, baseC: Chroma): Chroma {
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return this.float(baseC, isLight(l) ? MAXC_LIGHT : MAXC_DARK);
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}
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dullFor(l: Luma, baseC: Chroma): Chroma {
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return this.float(baseC, isLight(l) ? MINC_LIGHT : MINC_DARK);
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}
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analogous1(baseH: Hue): Hue {
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const size = this.float(MINH_SEP, 2 * MINH_SEP);
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return this.boolean() ? baseH + size : baseH - size;
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}
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analogous(baseH: Hue, count: number): Hue[] {
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const minWidth = min(count * MINH_SEP, MAXH_WIDTH * 0.8);
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const width = this.float(minWidth, MAXH_WIDTH);
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const sep = width / (count - 1);
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const start = baseH - (width / 2);
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const numbers = Array.from({length: count}, (_u, i) => start + i * sep);
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return this.boolean() ? numbers : numbers.reverse();
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}
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complementary1(baseH: Hue): Hue {
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return this.analogous1((baseH + 180) % 360);
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}
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complementary(baseH: Hue, count: number): Hue[] {
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const angle = this.float(180 - MAXH_COMPL/2, 180 + MAXH_COMPL/2);
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return this.analogous(baseH + angle, count);
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}
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triad(baseH: Hue): [Hue, Hue] {
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const angle = this.float(120 - MAXH_TRIAD/2, 120 + MAXH_TRIAD/2);
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return [baseH - angle, baseH + angle];
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}
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baseLuma(ld?: LD): Luma {
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if (ld == 'light') {
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return this.float(MINL_LIGHT, MAXL);
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} else if (ld == 'dark') {
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return this.float(MINL, MAXL_DARK);
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} else {
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return this.float(MINL, MAXL);
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}
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}
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baseChroma(l: Luma): Chroma {
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if (l >= MINL_LIGHT) {
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return this.float(MINC_LIGHT, MAXC_LIGHT);
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} else {
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return this.float(MINC_DARK, MAXC_DARK);
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}
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}
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baseHue(): Hue { return this.float(360); }
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}
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export class Oklch {
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readonly l: Luma; readonly c: Chroma; readonly h: Hue;
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static normHue(h: Hue) { return (h = h % 360) < 0 ? h + 360 : h; }
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constructor(l: Luma, c: Chroma, h: Hue);
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constructor(r: Rand, ld?: LD);
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constructor(cs: Oklch.Channels);
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constructor(ll: Luma | Oklch.Channels | Rand, cc?: Chroma | LD, hh?: Hue) {
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if (hh !== undefined) {
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this.l = ll as Luma;
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this.c = cc as Chroma;
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this.h = hh as Hue;
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} else if (typeof ll == 'object' && 'l' in ll) {
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const {l, c, h} = ll as Oklch.Channels;
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this.l = l; this.c = c; this.h = h;
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} else {
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const r = ll as Rand;
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this.l = r.baseLuma(cc as LD | undefined);
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this.c = r.baseChroma(this.l);
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this.h = r.baseHue();
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}
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}
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css(alpha: number = 1): string {
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const l = (this.l * 100).toFixed(0);
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const c = (this.c * 250).toFixed(0);
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const h = this.h.toFixed(0);
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if (alpha != 1) { return `oklch(${l}% ${c}% ${h} / ${alpha})`; }
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else { return `oklch(${l}% ${c}% ${h})`; }
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}
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with(maps: Oklch.With): Oklch {
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function call(comp: Oklch.With1, x: number) {
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switch (typeof comp) {
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case 'number': return comp;
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case 'function': return comp(x);
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default: return x;
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}
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}
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return new Oklch({
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l: call(maps.l, this.l),
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c: call(maps.c, this.c),
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h: call(maps.h, this.h),
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});
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}
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rgb(): Rgb { return toRgbViaCanvas(this); }
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}
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export type SchemeType = 'triad' | 'fin-belly' | 'fin-body';
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export type OuterLayer = 'outer' | 'spines' | 'vitiligo1';
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export type SockLayer = 'stripes' | 'cuffs';
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export type FinLayer = 'fins1' | 'fins2' | 'fins3' | 'vitiligo4';
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export type BellyLayer = 'belly1' | 'vitiligo3' | 'belly2' | 'vitiligo2';
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export type MiscLayer = 'eyes' | 'masks' | 'claws' | 'lines';
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export type Layer =
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OuterLayer | SockLayer | FinLayer | BellyLayer | MiscLayer;
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export type ColsOf<A extends string> = Record<A, Oklch>;
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export type OuterCols = ColsOf<OuterLayer>;
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export type SockCols = ColsOf<SockLayer>;
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export type FinCols = ColsOf<FinLayer>;
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export type BellyCols = ColsOf<BellyLayer>;
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export type MiscCols = ColsOf<MiscLayer>;
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export type Colors = ColsOf<Layer>;
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export type Scheme = Colors & {type: SchemeType};
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export const allLayers: Layer[] =
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['outer', 'spines', 'stripes', 'cuffs', 'fins1', 'fins2', 'fins3',
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'belly1', 'belly2', 'masks', 'claws', 'vitiligo1', 'vitiligo2', 'vitiligo3',
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'vitiligo4', 'eyes', 'lines'];
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export function makeColorInfo<A>(f: (l: Layer) => A): Record<Layer, A> {
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return Object.fromEntries(allLayers.map(l => [l, f(l)])) as Record<Layer, A>;
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}
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export function colors(r: Rand = new Rand()): Scheme {
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const outer = new Oklch(r, 'dark');
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let outerCols: OuterCols =
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{ outer, spines: mkSpines(r, outer), vitiligo1: mkVitiligo(r, outer) };
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const stripes = mkStripes(r);
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let sockCols: SockCols = { stripes, cuffs: mkCuffs(r, stripes) };
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let finCols: FinCols, bellyCols: BellyCols, type: SchemeType;
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const whichBody = r.float();
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if (whichBody > 2/3) {
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type = 'triad';
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const [f, b] = r.triad(outer.h);
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finCols = mkFins(r, f, outer); bellyCols = mkBelly(r, b);
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} else if (whichBody > 1/3) {
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type = 'fin-belly';
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const [f, b] = r.complementary(outer.h, 2);
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finCols = mkFins(r, f!, outer); bellyCols = mkBelly(r, b!);
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} else {
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type = 'fin-body';
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finCols = mkFins(r, r.analogous1(outer.h), outer);
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bellyCols = mkBelly(r, r.complementary1(outer.h));
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}
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let miscCols = mkMisc(r, outerCols, finCols, bellyCols);
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return merge(outerCols, sockCols, finCols, bellyCols, miscCols, type);
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}
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function mkSpines(r: Rand, outer: Oklch): Oklch {
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return outer.with({
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l: x => x * 0.8,
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c: x => x * 1.1,
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h: x => r.float(x + 12, x - 12),
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})
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}
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function mkVitiligo(r: Rand, outer: Oklch): Oklch {
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return outer.with({
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l: x => r.float(max(x, 0.94), 0.985), // exception to MAXL
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c: x => r.float(min(x, 0.1), MINC_LIGHT),
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});
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}
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function mkStripes(r: Rand): Oklch {
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return new Oklch({
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l: r.float(0.8, MAXL),
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c: r.float(MINC_LIGHT, MAXC_LIGHT),
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h: r.baseHue(),
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});
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}
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function mkCuffs(r: Rand, sock: Oklch): Oklch {
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return sock.with({
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l: l => r.float(l * 0.85, l * 0.65),
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c: c => r.float(c, MAXC_LIGHT),
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h: h => r.float(h + 8, h - 8),
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});
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}
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function mkFins(r: Rand, h: Hue, outer: Oklch): FinCols {
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const [fin1Hue, fin2Hue, fin3Hue] = r.analogous(h, 3);
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const direction: 'lighter' | 'darker' = r.choice(['lighter', 'darker']);
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function ll(l: Luma): Luma {
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return direction == 'lighter' ? r.lightFor(l) : r.darkFor(l);
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}
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function cc(l: Luma, c: Chroma): Chroma {
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return direction == 'lighter' ? r.dullFor(l, c) : r.brightFor(l, c);
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}
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const fins1 = new Oklch(ll(outer.l), cc(outer.l, outer.c), fin1Hue!);
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const fins2 = new Oklch(ll(fins1.l), cc(fins1.l, fins1.c), fin2Hue!);
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const fins3 = new Oklch(ll(fins2.l), cc(fins2.l, fins2.c), fin3Hue!);
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const lighter = fins1.l >= fins3.l ? fins1 : fins3;
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const vitiligo4 = mkVitiligo(r, lighter);
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return { fins1, fins2, fins3, vitiligo4 };
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}
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function mkBelly(r: Rand, h: Hue): BellyCols {
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const [belly1Hue, belly2Hue] = r.analogous(h, 2);
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const belly1 = new Oklch({
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l: r.float(0.7, MAXL),
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c: r.baseChroma(1),
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h: belly1Hue!
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});
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const belly2 = belly1.with({
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l: x => min(MAXL, x * 1.1),
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c: x => x * 0.9,
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h: belly2Hue!,
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});
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const vitiligo3 = mkVitiligo(r, belly1);
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const vitiligo2 = mkVitiligo(r, belly2);
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return { belly1, belly2, vitiligo2, vitiligo3 };
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}
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function mkMisc(r: Rand, o: OuterCols, f: FinCols, b: BellyCols): MiscCols {
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const masks = new Oklch({
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l: r.float(0.8, MAXL),
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c: r.float(0.01, 0.06),
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h: r.analogous1(r.choice([o.outer, b.belly1, f.fins1]).h)
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});
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return {
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masks,
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eyes: new Oklch({
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l: r.baseLuma('light'),
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c: r.float(0.28, MAXC_LIGHT),
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h: r.boolean() ? r.analogous1(o.outer.h) : r.complementary1(o.outer.h)
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}),
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claws: masks.with({
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l: x => min(MAXL, x + r.float(0, 0.1)),
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c: r.float(0.01, 0.06),
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h: h => r.analogous1(h),
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}),
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lines: new Oklch({
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l: r.float(0.01, 0.06),
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c: r.baseChroma(0),
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h: r.analogous1(o.outer.h)
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}),
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};
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}
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function merge({ outer, spines, vitiligo1 }: OuterCols,
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{ stripes, cuffs }: SockCols,
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{ fins1, fins2, fins3, vitiligo4 }: FinCols,
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{ belly1, vitiligo3, belly2, vitiligo2 }: BellyCols,
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{ eyes, masks, claws, lines }: MiscCols,
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type: SchemeType): Scheme {
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return {
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outer, spines, vitiligo1, stripes, cuffs, fins1, fins2, fins3, vitiligo4,
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belly1, vitiligo3, belly2, vitiligo2, eyes, masks, claws, lines, type
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};
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}
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export namespace Rgb {
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export type Channel = number;
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export type Channels = { r: number, g: number, b: number };
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}
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export class Rgb {
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readonly r: Rgb.Channel;
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readonly g: Rgb.Channel;
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readonly b: Rgb.Channel;
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static clamp(x: Rgb.Channel) {
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return min(max(0, Math.floor(x)), 255);
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}
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constructor(r: Rgb.Channel, g: Rgb.Channel, b: Rgb.Channel);
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constructor({r, g, b}: Rgb.Channels);
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constructor(rr: Rgb.Channel | Rgb.Channels, gg?: Rgb.Channel, bb?: Rgb.Channel) {
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const C = Rgb.clamp;
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if (typeof rr == 'number') {
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this.r = C(rr!); this.g = C(gg!); this.b = C(bb!);
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} else {
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this.r = C(rr.r); this.g = C(rr.g); this.b = C(rr.b);
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}
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}
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css() {
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function h(x: Rgb.Channel) {
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let s = x.toString(16);
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return s.length == 2 ? s : '0' + s;
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}
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return `#${h(this.r)}${h(this.g)}${h(this.b)}`
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}
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}
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export type Rgbs = Record<Layer, Rgb>;
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let rgbBuf: OffscreenCanvasRenderingContext2D;
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export function toRgbViaCanvas(col: Oklch): Rgb {
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rgbBuf ??= new OffscreenCanvas(1, 1).getContext('2d')!;
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rgbBuf.fillStyle = col.css();
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rgbBuf.fillRect(0, 0, 1, 1);
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const rgb = rgbBuf.getImageData(0, 0, 1, 1).data;
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return new Rgb(rgb[0]!, rgb[1]!, rgb[2]!);
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}
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export function toRgbs(col: Colors): Rgbs {
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return makeColorInfo(l => col[l].rgb());
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}
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export function toHex({r, g, b}: Rgb): string {
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function chan(n: number) {
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let a = Math.floor(n).toString(16);
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return a.length == 1 ? `0${a}` : a;
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}
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return `#${chan(r)}${chan(g)}${chan(b)}`;
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}
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