@mui/x-charts/modern/hooks/useTicks.js

The community edition of the charts components (MUI X).

import * as React from 'react';
import { isBandScale } from '../internals/isBandScale';
export function getTickNumber(params) {
  const {
    tickMaxStep,
    tickMinStep,
    tickNumber,
    range,
    domain
  } = params;
  const maxTicks = tickMinStep === undefined ? 999 : Math.floor(Math.abs(domain[1] - domain[0]) / tickMinStep);
  const minTicks = tickMaxStep === undefined ? 2 : Math.ceil(Math.abs(domain[1] - domain[0]) / tickMaxStep);
  const defaultizedTickNumber = tickNumber ?? Math.floor(Math.abs(range[1] - range[0]) / 50);
  return Math.min(maxTicks, Math.max(minTicks, defaultizedTickNumber));
}
function useTicks(options) {
  const {
    scale,
    tickNumber,
    valueFormatter,
    tickInterval
  } = options;
  return React.useMemo(() => {
    // band scale
    if (isBandScale(scale)) {
      const domain = scale.domain();
      if (scale.bandwidth() > 0) {
        // scale type = 'band'
        return [...domain.map(value => ({
          value,
          formattedValue: valueFormatter?.(value) ?? `${value}`,
          offset: scale(value) - (scale.step() - scale.bandwidth()) / 2,
          labelOffset: scale.step() / 2
        })), {
          formattedValue: undefined,
          offset: scale.range()[1],
          labelOffset: 0
        }];
      }

      // scale type = 'point'
      const filteredDomain = typeof tickInterval === 'function' && domain.filter(tickInterval) || typeof tickInterval === 'object' && tickInterval || domain;
      return filteredDomain.map(value => ({
        value,
        formattedValue: valueFormatter?.(value) ?? `${value}`,
        offset: scale(value),
        labelOffset: 0
      }));
    }
    const ticks = typeof tickInterval === 'object' ? tickInterval : scale.ticks(tickNumber);
    return ticks.map(value => ({
      value,
      formattedValue: valueFormatter?.(value) ?? scale.tickFormat(tickNumber)(value),
      offset: scale(value),
      labelOffset: 0
    }));
  }, [tickNumber, scale, valueFormatter, tickInterval]);
}
export default useTicks;