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/**
* The eight life stages a character moves through. Used to pick how much
* wall-clock time one simulation tick represents at a given age.
*/
export type LifeStage =
| 'infancy'
| 'early_childhood'
| 'middle_childhood'
| 'adolescence'
| 'young_adult'
| 'middle_adult'
| 'late_adult'
| 'elderly'
/** How much game time one tick advances. */
export type TickUnit = 'year' | 'season' | 'month' | 'week'
/**
* Tick granularity per life stage. Infancy advances in years because
* there isn't weekly texture worth resolving; adulthood in weeks because
* that's the rhythm the design lives at; elderly in months as the pace
* slows again.
*/
export const TICK_UNIT_BY_LIFE_STAGE: Readonly<Record<LifeStage, TickUnit>> = {
infancy: 'year',
early_childhood: 'season',
middle_childhood: 'season',
adolescence: 'month',
young_adult: 'week',
middle_adult: 'week',
late_adult: 'week',
elderly: 'month'
}
/**
* Bucket an age in whole years into its life stage. Throws on negative age.
*/
export function lifeStageForAge(ageYears: number): LifeStage {
if (ageYears < 0) throw new Error(`Invalid age: ${ageYears}`)
if (ageYears < 3) return 'infancy'
if (ageYears < 7) return 'early_childhood'
if (ageYears < 13) return 'middle_childhood'
if (ageYears < 18) return 'adolescence'
if (ageYears < 30) return 'young_adult'
if (ageYears < 60) return 'middle_adult'
if (ageYears < 76) return 'late_adult'
return 'elderly'
}
/** Shortcut: map an age directly to its tick unit. */
export function tickUnitForAge(ageYears: number): TickUnit {
return TICK_UNIT_BY_LIFE_STAGE[lifeStageForAge(ageYears)]
}
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