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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | 9x 9x 27x 27x 27x 119x 119x 27x 27x 27x 27x 7x 27x | import { roundToFractionDigits } from '../round-to-fraction-digits';
const TOLERANCE = 1e-9;
const DECIMAL_BASE = 10;
function countDecimals(step: number): number {
let decimals = 0;
let scaled = step;
while (Math.abs(scaled - Math.round(scaled)) > TOLERANCE * scaled) {
scaled *= DECIMAL_BASE;
decimals += 1;
}
return decimals;
}
export function snapToStep(value: number, step: number, snap: (quotient: number) => number): number {
let quotient = value / step;
const nearest = Math.round(quotient);
// 0.3 / 0.1 is 2.9999999999999996: snap it to 3 before flooring.
if (Math.abs(quotient - nearest) <= TOLERANCE * Math.max(1, Math.abs(quotient))) {
quotient = nearest;
}
return roundToFractionDigits(snap(quotient) * step, countDecimals(step));
}
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