settings.ts

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`a8fd3f13` 2026-10-10 Pavel Safronov	1	import { TIME_NAMES, type TimeName } from './render/sky.js'
`1ee103b4` 2026-10-11 Pavel Safronov	2	import { PACE_NAMES, type Pace } from './skater.js'
`a8fd3f13` 2026-10-10 Pavel Safronov	3	import { mulberry32 } from './world/lake.js'
	4
`236f7d03` 2026-10-10 Pavel Safronov	5	/** The weathers a lake can have. */
	6	export const WEATHERS = ['clear', 'snow', 'blizzard'] as const
	7	export type Weather = (typeof WEATHERS)[number]
	8
	9	/**
	10	* What a weather is: how much snow is falling, from 0 to 1; how far the eye can see
	11	* through it, metres; how much of the sky is cloud; and how hard the wind blows, m/s,
	12	* at its lulls and in its gusts.
	13	*/
	14	export const WEATHER: Record<Weather, { snow: number; sight: number; overcast: number; wind: readonly [number, number] }> = {
	15	clear: { snow: 0, sight: 600, overcast: 0, wind: [0, 0] },
	16	snow: { snow: 0.35, sight: 420, overcast: 0.7, wind: [0.5, 3] },
	17	blizzard: { snow: 1, sight: 200, overcast: 0.95, wind: [7, 16] },
	18	}
	19
`a8fd3f13` 2026-10-10 Pavel Safronov	20	/** What the skater has chosen in the settings box, kept from one visit to the next. */
	21	export interface Settings {
	22	/** A time of day, or `surprise` for whichever the lake comes with. */
	23	time: TimeName \| 'surprise'
`236f7d03` 2026-10-10 Pavel Safronov	24	/** The weather, or `surprise` for whichever the lake comes with. */
	25	weather: Weather \| 'surprise'
`1ee103b4` 2026-10-11 Pavel Safronov	26	/** The pace the skater keeps (skater.ts). */
	27	pace: Pace
`a8fd3f13` 2026-10-10 Pavel Safronov	28	/** Whether the lake has ice thinner than any ice could be (world/lake.ts). */
	29	impossibleIce: boolean
`8876a48d` 2026-10-10 Pavel Safronov	30	/** Whether tilting the phone steers (input.ts). */
	31	tilt: boolean
`a8fd3f13` 2026-10-10 Pavel Safronov	32	}
	33
`1ee103b4` 2026-10-11 Pavel Safronov	34	const DEFAULTS: Settings = { time: 'surprise', weather: 'surprise', pace: 'cruise', impossibleIce: false, tilt: false }
`a8fd3f13` 2026-10-10 Pavel Safronov	35	const KEY = 'settings'
	36
	37	export function loadSettings(): Settings {
	38	try {
	39	const kept = JSON.parse(localStorage.getItem(KEY) ?? '{}') as Partial<Settings>
	40	return {
	41	time: kept.time === 'surprise' \|\| TIME_NAMES.includes(kept.time as TimeName) ? kept.time! : DEFAULTS.time,
`236f7d03` 2026-10-10 Pavel Safronov	42	weather: kept.weather === 'surprise' \|\| WEATHERS.includes(kept.weather as Weather) ? kept.weather! : DEFAULTS.weather,
`1ee103b4` 2026-10-11 Pavel Safronov	43	pace: PACE_NAMES.includes(kept.pace as Pace) ? kept.pace! : DEFAULTS.pace,
`a8fd3f13` 2026-10-10 Pavel Safronov	44	impossibleIce: kept.impossibleIce === true,
`8876a48d` 2026-10-10 Pavel Safronov	45	tilt: kept.tilt === true,
`a8fd3f13` 2026-10-10 Pavel Safronov	46	}
	47	} catch {
	48	// No storage, or nonsense in it: the settings last for this visit only.
	49	return { ...DEFAULTS }
	50	}
	51	}
	52
	53	export function saveSettings(settings: Settings): void {
	54	try {
	55	localStorage.setItem(KEY, JSON.stringify(settings))
	56	} catch {
	57	// As above.
	58	}
	59	}
	60
	61	/** A lake to skate that nobody has asked for by number: one of a million. */
	62	export function anyLake(): number {
	63	return 1 + Math.floor(Math.random() * 999_999)
	64	}
	65
	66	/**
	67	* The time of day lake number `seed` comes with. Part of the lake, so that a link to a
	68	* lake is a link to the same water under the same sky. Day is the likeliest, and the
	69	* aurora, as it should be, the least.
	70	*/
	71	export function timeOf(seed: number): TimeName {
	72	const r = mulberry32(seed ^ 0x5bd1e995)()
	73	return r < 0.35 ? 'day' : r < 0.55 ? 'dusk' : r < 0.82 ? 'night' : 'aurora'
	74	}
`236f7d03` 2026-10-10 Pavel Safronov	75
	76	/**
	77	* The weather lake number `seed` comes with. Most days are clear; snow falls on a
	78	* quarter of them, and a blizzard blows on one in ten.
	79	*/
	80	export function weatherOf(seed: number): Weather {
	81	const r = mulberry32(seed ^ 0x3c6ef372)()
	82	return r < 0.64 ? 'clear' : r < 0.9 ? 'snow' : 'blizzard'
	83	}
	84
	85	/** Which way the wind blows over lake number `seed`, radians: 0 is down the lake, a quarter turn is across it to the right. */
	86	export function windOf(seed: number): number {
	87	return mulberry32(seed ^ 0x1b873593)() * Math.PI * 2
	88	}