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57 lines
1.6 KiB
57 lines
1.6 KiB
4 months ago
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import { isNumber } from '@antv/util';
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import { d3Ticks } from '../tick-methods/d3-ticks';
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import { ConstantOptions, Domain, Range } from '../types';
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import { Base } from './base';
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export class Constant extends Base<ConstantOptions> {
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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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protected getDefaultOptions(): ConstantOptions {
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return {
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range: [0],
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domain: [0, 1],
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unknown: undefined,
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tickCount: 5,
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tickMethod: d3Ticks,
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};
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}
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/**
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* 输入和输出满足：y = b，其中 b 是一个常量，是 options.range 的第一个元素
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* @param _ 输入值
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* @returns 输出值（常量）
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*/
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// eslint-disable-next-line @typescript-eslint/no-unused-vars
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public map(_: Domain<ConstantOptions>) {
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const [v] = this.options.range;
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return v !== undefined ? v : this.options.unknown;
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}
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/**
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* 如果 x 是该比例尺的常量（x === b），返回输入值的范围（即定义域），否者返回 []
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* @param x 输出值 (常量）
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* @returns 定义域
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*/
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public invert(x: Range<ConstantOptions>) {
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const [v] = this.options.range;
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return x === v && v !== undefined ? this.options.domain : [];
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}
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public getTicks() {
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const { tickMethod, domain, tickCount } = this.options;
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const [a, b] = domain;
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if (!isNumber(a) || !isNumber(b)) return [];
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return tickMethod(a, b, tickCount);
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}
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/**
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* 克隆 Constant Scale
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* @returns 拥有相同选项且独立的 Constant Scale
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*/
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public clone() {
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return new Constant(this.options);
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}
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}
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