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53 lines
1.7 KiB
53 lines
1.7 KiB
import { prettyNumber } from '../utils/pretty-number';
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/**
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* 创建分割点
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* @param min 左区间
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* @param max 右区间
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* @param n 分割点个数
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* @returns 计算后的 ticks
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* @see R pretty https://svn.r-project.org/R/trunk/src/appl/pretty.c
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* @see R pretty https://www.rdocumentation.org/packages/base/versions/3.5.2/topics/pretty
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*/
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export const rPretty = (min, max, m = 5) => {
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if (min === max) {
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return [min];
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}
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const n = m < 0 ? 0 : Math.round(m);
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if (n === 0)
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return [];
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// high.u.bias
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const h = 1.5;
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// u5.bias
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const h5 = 0.5 + 1.5 * h;
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// 反正我也不会调参，跳过所有判断步骤
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const d = max - min;
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const c = d / n;
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// 当d非常小的时候触发，但似乎没什么用
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// const min_n = Math.floor(n / 3);
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// const shrink_sml = Math.pow(2, 5);
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// if (Math.log10(d) < -2) {
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// c = (_.max([ Math.abs(max), Math.abs(min) ]) * shrink_sml) / min_n;
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// }
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const base = 10 ** Math.floor(Math.log10(c));
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let unit = base;
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if (2 * base - c < h * (c - unit)) {
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unit = 2 * base;
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if (5 * base - c < h5 * (c - unit)) {
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unit = 5 * base;
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if (10 * base - c < h * (c - unit)) {
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unit = 10 * base;
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}
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}
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}
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const nu = Math.ceil(max / unit);
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const ns = Math.floor(min / unit);
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const hi = Math.max(nu * unit, max);
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const lo = Math.min(ns * unit, min);
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const size = Math.floor((hi - lo) / unit) + 1;
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const ticks = new Array(size);
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for (let i = 0; i < size; i += 1) {
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ticks[i] = prettyNumber(lo + i * unit);
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}
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return ticks;
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};
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//# sourceMappingURL=r-pretty.js.map
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