import { TFormatLabelFn } from "./LabelProvider";
import { ILabel2DOptions } from "./LabelProviderBase2D";
import { NumericLabelProvider } from "./NumericLabelProvider";
export interface IRadianLabelProviderOptions extends ILabel2DOptions {
    /**
     * The maximum denominator to use when formatting values as fractions of PI
     *
     * e.g. For 12, you can expect fractions such as `11π/12`, `3π/4`, `5π/6`, but NOT `13π/24`
     *
     * Default `12`
     */
    maxDenominator?: number;
    /**
     * The maximum error tolerance when formatting values as fractions of PI
     *
     * If a tick lands within this tolerance of a fraction of PI, it is formatted as that PI fraction, else it reverts to a decimal.
     *
     * Default `0.0001`
     */
    errorTolerance?: number;
}
/**
 * The {@link RadianLabelProvider} formats Axis Labels and Cursor / Tooltips for {@link NumericAxis} types as multiples/fractions of PI
 * @note It is highly recommended to use this label provider with these axis options:
 * ```ts
 * const xAxis = new NumericAxis(wasmContext, {
 *          labelProvider: new RadianLabelProvider({
 *             maxDenominator: 4, // or any other non-zero integer
 *             errorTolerance: 0.0001,
 *
 *             labelPrecision: 2
 *              // for values that cannot be expressed as fractions of PI within `maxDenominator` constraint,
 *              // thus default to decimal format
 *          }),
 *          autoTicks: false, // to manually set tick distance
 *          majorDelta: Math.PI / 4, // or any other PI fraction
 * });
 * ```
 */
export declare class RadianLabelProvider extends NumericLabelProvider {
    private maxDenominatorProperty;
    private errorToleranceProperty;
    constructor(options?: IRadianLabelProviderOptions);
    /**
     * Gets or sets the maximum denominator to use when formatting values as fractions of PI
     */
    get maxDenominator(): number;
    set maxDenominator(value: number);
    /**
     * Gets or sets the maximum error tolerance when formatting values as fractions of PI
     */
    get errorTolerance(): number;
    set errorTolerance(value: number);
    /**
     * Used internally.
     * Returns the greatest common divisor of two numbers.
     */
    private getGCD;
    /**
     * Used internally.
     * Finds the best fraction for a given ratio and maximum denominator, returns decimal if no fraction found.
     */
    private findFraction;
    /**
     * @inheritdoc
     */
    get formatLabel(): TFormatLabelFn;
}