@antv/scale/esm/utils/d3-linear-nice.js

Toolkit for mapping abstract data into visual representation.

// 参考 d3-ticks nice 的实现
// https://github.com/d3/d3-scale
import { tickIncrement } from './ticks';
export const d3LinearNice = (min, max, count = 5) => {
    const d = [min, max];
    let i0 = 0;
    let i1 = d.length - 1;
    let start = d[i0];
    let stop = d[i1];
    let step;
    if (stop < start) {
        [start, stop] = [stop, start];
        [i0, i1] = [i1, i0];
    }
    step = tickIncrement(start, stop, count);
    if (step > 0) {
        start = Math.floor(start / step) * step;
        stop = Math.ceil(stop / step) * step;
        step = tickIncrement(start, stop, count);
    }
    else if (step < 0) {
        start = Math.ceil(start * step) / step;
        stop = Math.floor(stop * step) / step;
        step = tickIncrement(start, stop, count);
    }
    if (step > 0) {
        d[i0] = Math.floor(start / step) * step;
        d[i1] = Math.ceil(stop / step) * step;
    }
    else if (step < 0) {
        d[i0] = Math.ceil(start * step) / step;
        d[i1] = Math.floor(stop * step) / step;
    }
    return d;
};
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