recharts/types/util/scale/RechartsScale.d.ts

React charts

import { CustomScaleDefinition } from './CustomScaleDefinition';
import { CategoricalDomainItem } from '../types';
/**
 * This is internal representation of scale used in Recharts.
 * Users will provide CustomScaleDefinition or a string, which we will parse into RechartsScale.
 * Most importantly, RechartsScale is fully immutable - there are no setters that mutate the scale in place.
 * This is important for React integration - if the scale changes, we want to trigger re-renders.
 * Mutating the scale in place would not trigger re-renders, leading to stale UI.
 */
export interface RechartsScale<Domain extends CategoricalDomainItem = CategoricalDomainItem> {
    /**
     * Returns the scale's current domain.
     * The domain could be:
     * - in categorical scales: an array of strings or categories
     * - in continuous scales: tuple of two numbers: [min, max]
     */
    domain(): ReadonlyArray<Domain>;
    /**
     * Returns the scale’s current range.
     *
     * This should be a readonly tuple of two numbers: [min, max]
     * and so a better type would be `readonly [number, number]` but again - breaking changes,
     * so let's keep that for 4.0.
     */
    range(): ReadonlyArray<number>;
    /**
     * Returns the minimum value from the range.
     */
    rangeMin(): number;
    /**
     * Returns the maximum value from the range.
     */
    rangeMax(): number;
    /**
     * Returns true if the given value is within the scale's range.
     * @param value
     */
    isInRange(value: number): boolean;
    /**
     * Returns width of each band.
     * Most scales are not banded, so this method is optional.
     * Banded scales (like scaleBand from d3-scale) will implement this method.
     */
    bandwidth?: () => number;
    /**
     * Quantitative (continuous) scales provide a ticks method that returns representative values from the scale’s domain.
     * Ordinal and band scales do not have this method.
     *
     * An optional count argument requests more or fewer ticks.
     * The number of ticks returned, however, is not necessarily equal to the requested count.
     *
     * @see {@link https://d3js.org/d3-scale/linear#linear_ticks}
     * @see {@link https://observablehq.com/@d3/scale-ticks}
     *
     * @param count number of ticks
     */
    ticks?: (count: number | undefined) => ReadonlyArray<number>;
    /**
     * Given an arbitrary input, returns the corresponding point derived from the output range if the input is in the scale's domain.
     * If the input is not included in the domain, returns undefined.
     */
    map(input: unknown, options?: {
        position?: BandPosition;
    }): number | undefined;
}
/**
 * Position within a band for banded scales.
 * In scales that are not banded, this parameter is ignored.
 *
 * @inline
 */
export type BandPosition = 'start' | 'middle' | 'end';
export declare function rechartsScaleFactory<Domain extends CategoricalDomainItem = CategoricalDomainItem>(d3Scale: CustomScaleDefinition<Domain>): RechartsScale<Domain>;
export declare function rechartsScaleFactory<Domain extends CategoricalDomainItem = CategoricalDomainItem>(d3Scale: CustomScaleDefinition<Domain> | undefined): RechartsScale<Domain> | undefined;