import type { ChannelNumber } from '../../types';
import type { GraphicsStyles, SpectrumScale } from './Visualizer';
import type { SpectrumParams } from './Spectrum';
import { Spectrum } from './Spectrum';
export type AmplitudeSpectrumUnit = 'none' | 'decibel';
export type AmplitudeSpectrumParams = SpectrumParams & {
    unit?: AmplitudeSpectrumUnit;
};
/**
 * This private class visualizes amplitude spectrum.
 */
export declare class AmplitudeSpectrum extends Spectrum {
    private unit;
    private renderAmplitudeTexts;
    /**
     * @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 amplitude spectrum.
     * This method is overloaded for type interface and type check.
     * @param {keyof AmplitudeSpectrumParams|AmplitudeSpectrumParams} params This argument is string if getter. Otherwise, setter.
     * @return {AmplitudeSpectrumParams[keyof AmplitudeSpectrumParams]|PhaseSpectrum} Return value is parameter for visualizing amplitude 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'): AmplitudeSpectrumUnit;
    param(params: AmplitudeSpectrumParams): AmplitudeSpectrum;
    /**
     * This method sets function that render amplitude texts on y coordinate.
     * @param {function|null} renderer This argument is function that render amplitude texts on y coordinate.
     * @return {AmplitudeSpectrum} Return value is for method chain.
     */
    setRenderAmplitudeTextsFunction(renderer: ((data: Float32Array) => void) | null): AmplitudeSpectrum;
    /**
     * This method visualizes amplitude spectrum to Canvas.
     * @param {Float32Array} data This argument is frequency domain data amplitude for spectrum.
     * @param {number} minDecibels This argument is in order to determine dB range of amplitude spectrum. The default value is -100 dB.
     * @param {number} maxDecibels This argument is in order to determine db range of amplitude spectrum. The default value is -30 dB.
     * @override
     */
    protected renderCanvas(data: Float32Array, minDecibels?: number, maxDecibels?: number): void;
    /**
     * This method visualizes amplitude spectrum to SVG.
     * @param {Float32Array} data This argument is frequency domain data for amplitude spectrum.
     * @param {number} minDecibels This argument is in order to determine dB range of amplitude spectrum. Default value is -100 dB.
     * @param {number} maxDecibels This argument is in order to determine db range of amplitude spectrum. Default value is -30 dB.
     * @override
     */
    protected renderSVG(data: Float32Array, minDecibels?: number, maxDecibels?: number): void;
}
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