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37 lines
1.5 KiB
37 lines
1.5 KiB
import { Base } from './base';
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import { ContinuousOptions, Domain, Range, NiceMethod, TickMethodOptions, Transform } from '../types';
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/**
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* Continuous 比例尺 的输入 x 和输出 y 满足：y = a * f(x) + b
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* 通过函数柯里化和复合函数可以在映射过程中去掉分支，提高性能。
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* 参考：https://github.com/d3/d3-scale/blob/master/src/continuous.js
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*/
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export declare abstract class Continuous<O extends ContinuousOptions> extends Base<O> {
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/** 实际上将 x 映射为 y 的函数 */
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protected output: Transform;
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/** 实际上将 y 映射为 x 的函数 */
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protected input: Transform;
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/**
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* 根据比例尺 和 options 选择对应的 transform 和 untransform 函数
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* y = a * f(x) + b
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* x = a * f'(y) + b
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* @returns [f(x), f'(y)]
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*/
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protected abstract chooseTransforms(): Transform[];
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protected getDefaultOptions(): O;
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/**
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* y = interpolate(normalize(clamp(transform(x))))
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*/
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map(x: Domain<O>): any;
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/**
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* x = transform(clamp(interpolate(normalize(y))))
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*/
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invert(x: Range<O>): any;
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protected nice(): void;
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getTicks(): (number | Date)[];
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protected getTickMethodOptions(): TickMethodOptions;
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protected chooseNice(): NiceMethod<number | Date>;
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protected rescale(): void;
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protected chooseClamp(transform: Transform): (x: number) => number;
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protected composeOutput(transform: Transform, clamp: Transform): void;
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protected composeInput(transform: Transform, untransform: Transform, clamp: Transform): void;
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}
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