ag-charts-community
Version:
Advanced Charting / Charts supporting Javascript / Typescript / React / Angular / Vue
59 lines • 2.04 kB
JavaScript
export default function (a, b, count) {
const step = tickStep(a, b, count);
a = Math.ceil(a / step) * step;
b = Math.floor(b / step) * step + step / 2;
// Add half a step here so that the array returned by `range` includes the last tick.
return range(a, b, step);
}
const e10 = Math.sqrt(50);
const e5 = Math.sqrt(10);
const e2 = Math.sqrt(2);
export function tickStep(a, b, count) {
const rawStep = Math.abs(b - a) / Math.max(0, count);
let step = Math.pow(10, Math.floor(Math.log(rawStep) / Math.LN10)); // = Math.log10(rawStep)
const error = rawStep / step;
if (error >= e10) {
step *= 10;
}
else if (error >= e5) {
step *= 5;
}
else if (error >= e2) {
step *= 2;
}
return b < a ? -step : step;
}
export function tickIncrement(a, b, count) {
const rawStep = (b - a) / Math.max(0, count);
const power = Math.floor(Math.log(rawStep) / Math.LN10);
const error = rawStep / Math.pow(10, power);
return power >= 0
? (error >= e10 ? 10 : error >= e5 ? 5 : error >= e2 ? 2 : 1) * Math.pow(10, power)
: -Math.pow(10, -power) / (error >= e10 ? 10 : error >= e5 ? 5 : error >= e2 ? 2 : 1);
}
export class NumericTicks extends Array {
constructor(fractionDigits, elements) {
super();
if (elements) {
for (let i = 0, n = elements.length; i < n; i++) {
this[i] = elements[i];
}
}
this.fractionDigits = fractionDigits;
}
}
function range(a, b, step = 1) {
const absStep = Math.abs(step);
const fractionDigits = (absStep > 0 && absStep < 1)
? Math.abs(Math.floor(Math.log(absStep) / Math.LN10))
: 0;
const f = Math.pow(10, fractionDigits);
const n = Math.max(0, Math.ceil((b - a) / step)) || 0;
const values = new NumericTicks(fractionDigits);
for (let i = 0; i < n; i++) {
const value = a + step * i;
values[i] = Math.round(value * f) / f;
}
return values;
}
//# sourceMappingURL=ticks.js.map