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50 lines
1.6 KiB
50 lines
1.6 KiB
import { Threshold } from './threshold';
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import { wilkinsonExtended } from '../tick-methods/wilkinson-extended';
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import { createQuartile } from '../utils/create-quartile';
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/**
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* 类似 Threshold 比例尺，区别在于分位数比例尺 (Quantile) 将一个离散的输入域映射到一个离散的输出域
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* 输入域被指定为一组离散的样本值，输出域中的值的数量决定了分位数的数量。
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*/
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export class Quantile extends Threshold {
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getDefaultOptions() {
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return {
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domain: [],
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range: [],
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tickCount: 5,
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unknown: undefined,
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tickMethod: wilkinsonExtended,
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};
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}
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constructor(options) {
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super(options);
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}
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rescale() {
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const { domain, range } = this.options;
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this.n = range.length - 1;
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this.thresholds = createQuartile(domain, this.n + 1, false);
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}
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/**
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* 如果是在第一段后或者最后一段就把两端的值添加上
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*/
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invert(y) {
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const [a, b] = super.invert(y);
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const { domain } = this.options;
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const dMin = domain[0];
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const dMax = domain[domain.length - 1];
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return a === undefined && b === undefined ? [a, b] : [a || dMin, b || dMax];
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}
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getThresholds() {
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return this.thresholds;
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}
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clone() {
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return new Quantile(this.options);
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}
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getTicks() {
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const { tickCount, domain, tickMethod } = this.options;
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const lastIndex = domain.length - 1;
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const min = domain[0];
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const max = domain[lastIndex];
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return tickMethod(min, max, tickCount);
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}
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}
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//# sourceMappingURL=quantile.js.map
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