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60 lines
2.0 KiB
60 lines
2.0 KiB
import { localIntervalMap } from './time-interval';
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import { utcIntervalMap } from './utc-interval';
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import { bisect } from './bisect';
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import { tickStep } from './ticks';
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function chooseTickIntervals(utc) {
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const intervalMap = utc ? utcIntervalMap : localIntervalMap;
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const { year, month, week, day, hour, minute, second, millisecond } = intervalMap;
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const tickIntervals = [
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[second, 1],
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[second, 5],
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[second, 15],
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[second, 30],
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[minute, 1],
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[minute, 5],
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[minute, 15],
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[minute, 30],
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[hour, 1],
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[hour, 3],
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[hour, 6],
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[hour, 12],
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[day, 1],
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[day, 2],
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[week, 1],
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[month, 1],
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[month, 3],
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[year, 1],
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];
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return {
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tickIntervals,
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year,
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millisecond,
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};
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}
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export function findTickInterval(start, stop, count, interval, utc) {
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const lo = +start;
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const hi = +stop;
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const { tickIntervals, year, millisecond } = chooseTickIntervals(utc);
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const getter = ([interval, count]) => interval.duration * count;
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const targetCount = interval ? (hi - lo) / interval : count || 5;
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const targetInterval = interval || (hi - lo) / targetCount;
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const len = tickIntervals.length;
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const i = bisect(tickIntervals, targetInterval, 0, len, getter);
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let matchInterval;
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if (i === len) {
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const step = tickStep(lo / year.duration, hi / year.duration, targetCount);
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matchInterval = [year, step];
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}
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else if (i) {
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const closeToLow = targetInterval / getter(tickIntervals[i - 1]) < getter(tickIntervals[i]) / targetInterval;
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const [timeInterval, targetStep] = closeToLow ? tickIntervals[i - 1] : tickIntervals[i];
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const step = interval ? Math.ceil(interval / timeInterval.duration) : targetStep;
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matchInterval = [timeInterval, step];
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}
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else {
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const step = Math.max(tickStep(lo, hi, targetCount), 1);
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matchInterval = [millisecond, step];
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}
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return matchInterval;
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}
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//# sourceMappingURL=find-tick-interval.js.map
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