@uwdata/mosaic-sql/dist/src/transforms/scales.d.ts

SQL query construction and analysis.

import type { ExprValue } from '../types.js';
import { ExprNode } from '../ast/node.js';
export interface ScaleTransform<T> {
    apply: (value: T) => number;
    invert: (value: number) => T;
    sqlApply: (value: ExprValue) => ExprNode;
    sqlInvert: (value: ExprNode) => ExprNode;
}
export type ScaleType = 'identity' | 'linear' | 'log' | 'symlog' | 'sqrt' | 'pow' | 'time' | 'utc';
export type ScaleDomain = [number, number] | [Date, Date];
export interface ScaleOptions {
    /** The scale type, such as `'linear'`, `'log'`, etc. */
    type: ScaleType;
    /** The scale domain, as an array of start and end data values. */
    domain?: ScaleDomain;
    /**
     * The scale range, as an array of start and end screen pixels.
     * The range may be omitted for *identity* scales.
     */
    range?: [number, number];
    /** The base of the logarithm. For `'log'` scales only. */
    base?: number;
    /** The constant parameter. For `'symlog'` scales only. */
    constant?: number;
    /** The exponent parameter. For `'pow'` scales only. */
    exponent?: number;
}
export type Scale<T> = ScaleTransform<T> & ScaleOptions;
export declare function scaleTransform<T>(options: ScaleOptions): Scale<T>;
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