diff options
Diffstat (limited to 'src/lib.ts')
| -rw-r--r-- | src/lib.ts | 21 |
1 files changed, 20 insertions, 1 deletions
@@ -119,7 +119,7 @@ export class HistDate { if (yearDiff == 0){ return later.month - earlier.month; } else { - return (13 - earlier.month) + (yearDiff * 12) + later.month - 1; + return (13 - earlier.month) + (yearDiff - 1) * 12 + later.month - 1; } } clone(){ @@ -131,6 +131,7 @@ export class HistDate { const currentDate = new Date(); export const MIN_DATE = new HistDate(-13.8e9); export const MAX_DATE = new HistDate(currentDate.getFullYear(), currentDate.getMonth() + 1, currentDate.getDate()); +export const JDN_EPOCH = -4713; // The year where julian day numbers start (and where we can represent months+days) export const MONTH_SCALE = -1; export const DAY_SCALE = -2; export const SCALES = [1e9, 1e8, 1e7, 1e6, 1e5, 1e4, 1e3, 100, 10, 1, MONTH_SCALE, DAY_SCALE]; @@ -156,6 +157,10 @@ if (DEBUG){ } export function stepDate(date: HistDate, scale: number, {forward=true, count=1, inplace=false} = {}): HistDate { const newDate = inplace ? date : date.clone(); + if (count < 0){ + count = -count; + forward = !forward; + } for (let i = 0; i < count; i++){ if (scale == DAY_SCALE){ if (forward && newDate.day < 28){ @@ -201,6 +206,20 @@ export function inDateScale(date: HistDate, scale: number): boolean { return date.year % scale == 0 && date.month == 1 && date.day == 1; } } +export function getScaleRatio(scale: number, scale2: number){ + // Returns upper number of units in 'scale' per unit in 'scale2' + if (scale == DAY_SCALE){ + scale = 1 / 12 / 31; + } else if (scale == MONTH_SCALE){ + scale = 1 / 12; + } + if (scale2 == DAY_SCALE){ + scale2 = 1 / 12 / 31; + } else if (scale2 == MONTH_SCALE){ + scale2 = 1 / 12; + } + return scale2 / scale; +} // For sending timeline-bound data to BaseLine export type TimelineRange = { |