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import type { Point } from '../types/geometric.js';
/**
* @alias Chart.helpers.math
* @namespace
*/
export declare const PI: number;
export declare const TAU: number;
export declare const PITAU: number;
export declare const INFINITY: number;
export declare const RAD_PER_DEG: number;
export declare const HALF_PI: number;
export declare const QUARTER_PI: number;
export declare const TWO_THIRDS_PI: number;
export declare const log10: (x: number) => number;
export declare const sign: (x: number) => number;
export declare function almostEquals(x: number, y: number, epsilon: number): boolean;
/**
* Implementation of the nice number algorithm used in determining where axis labels will go
*/
export declare function niceNum(range: number): number;
/**
* Returns an array of factors sorted from 1 to sqrt(value)
* @private
*/
export declare function _factorize(value: number): number[];
export declare function isNumber(n: unknown): n is number;
export declare function almostWhole(x: number, epsilon: number): boolean;
/**
* @private
*/
export declare function _setMinAndMaxByKey(array: Record<string, number>[], target: {
min: number;
max: number;
}, property: string): void;
export declare function toRadians(degrees: number): number;
export declare function toDegrees(radians: number): number;
/**
* Returns the number of decimal places
* i.e. the number of digits after the decimal point, of the value of this Number.
* @param x - A number.
* @returns The number of decimal places.
* @private
*/
export declare function _decimalPlaces(x: number): number;
export declare function getAngleFromPoint(centrePoint: Point, anglePoint: Point): {
angle: number;
distance: number;
};
export declare function distanceBetweenPoints(pt1: Point, pt2: Point): number;
/**
* Shortest distance between angles, in either direction.
* @private
*/
export declare function _angleDiff(a: number, b: number): number;
/**
* Normalize angle to be between 0 and 2*PI
* @private
*/
export declare function _normalizeAngle(a: number): number;
/**
* @private
*/
export declare function _angleBetween(angle: number, start: number, end: number, sameAngleIsFullCircle?: boolean): boolean;
/**
* Limit `value` between `min` and `max`
* @param value
* @param min
* @param max
* @private
*/
export declare function _limitValue(value: number, min: number, max: number): number;
/**
* @param {number} value
* @private
*/
export declare function _int16Range(value: number): number;
/**
* @param value
* @param start
* @param end
* @param [epsilon]
* @private
*/
export declare function _isBetween(value: number, start: number, end: number, epsilon?: number): boolean;