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54 lines
1.5 KiB
54 lines
1.5 KiB
import { isNumber } from '@antv/util';
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import { Base } from './base';
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import { wilkinsonExtended } from '../tick-methods/wilkinson-extended';
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import { isValid } from '../utils';
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export class Identity extends Base {
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/**
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* 返回需要覆盖的默认选项
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* @returns 需要覆盖的默认选项
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*/
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getDefaultOptions() {
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return {
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domain: [0, 1],
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range: [0, 1],
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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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/**
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* 输入和输出满足：y = x
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* @param x 输入值
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* @returns 输出值
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*/
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map(x) {
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return isValid(x) ? x : this.options.unknown;
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}
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/**
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* map 的逆运算：x = y，在这里和 map 是相同方法
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* @param x 输出值
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* @returns 输入值
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*/
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invert(x) {
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return this.map(x);
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}
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/**
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* 克隆 Identity Scale
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* @returns 拥有相同选项且独立的 Identity Scale
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*/
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clone() {
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return new Identity(this.options);
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}
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/**
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* 根据比例尺的配置去生成 ticks，该 ticks 主要用于生成坐标轴
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* @returns 返回一个 ticks 的数组
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*/
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getTicks() {
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const { domain, tickCount, tickMethod } = this.options;
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const [min, max] = domain;
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if (!isNumber(min) || !isNumber(max))
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return [];
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return tickMethod(min, max, tickCount);
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}
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}
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//# sourceMappingURL=identity.js.map
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