import type { ChannelNumber } from '../../types';
import type { GraphicsStyles, SpectrumScale } from './Visualizer';
import type { SpectrumParams } from './Spectrum';
import { Spectrum } from './Spectrum';
export type PhaseSpectrumUnit = 'radian' | 'degree';
export type PhaseSpectrumParams = SpectrumParams & {
    unit?: PhaseSpectrumUnit;
};
/**
 * This private class visualizes phase spectrum.
 */
export declare class PhaseSpectrum extends Spectrum {
    private unit;
    private renderPhaseTexts;
    /**
     * @param {number} sampleRate This argument is sample rate.
     * @param {ChannelNumber} channel This argument is channel number (Left: 0, Right: 1 ...).
     */
    constructor(sampleRate: number, channel: ChannelNumber);
    /**
     * This method gets or sets parameters for visualizing phase spectrum.
     * This method is overloaded for type interface and type check.
     * @param {keyof PhaseSpectrumParams|PhaseSpectrumParams} params This argument is string if getter. Otherwise, setter.
     * @return {PhaseSpectrumParams[keyof PhaseSpectrumParams]|PhaseSpectrum} Return value is parameter for visualizing phase spectrum if getter.
     *     Otherwise, return value is for method chain.
     * @override
     */
    param(params: 'interval'): number;
    param(params: 'styles'): GraphicsStyles;
    param(params: 'scale'): SpectrumScale;
    param(params: 'logarithmicFrequencies'): number[];
    param(params: 'minFrequency'): number;
    param(params: 'maxFrequency'): number;
    param(params: 'textInterval'): number;
    param(params: 'unit'): PhaseSpectrumUnit;
    param(params: PhaseSpectrumParams): PhaseSpectrum;
    /**
     * This method sets function that render phase texts on y coordinate.
     * @param {function|null} renderer This argument is function that render phase texts on y coordinate.
     * @return {PhaseSpectrum} Return value is for method chain.
     */
    setRenderPhaseTextsFunction(renderer: ((data: Float32Array) => void) | null): PhaseSpectrum;
    /**
     * This method visualizes phase spectrum to Canvas.
     * @param {Float32Array} data This argument is frequency domain data phase for spectrum.
     * @override
     */
    protected renderCanvas(data: Float32Array): void;
    /**
     * This method visualizes phase spectrum to SVG.
     * @param {Float32Array} data This argument is frequency domain data for phase spectrum.
     * @override
     */
    protected renderSVG(data: Float32Array): void;
}
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