mirror of
https://github.com/Tonejs/Tone.js
synced 2024-12-29 04:53:10 +00:00
63 lines
2.2 KiB
TypeScript
63 lines
2.2 KiB
TypeScript
import { Gain } from "../../core/context/Gain";
|
|
import { NormalRange, Time } from "../../core/type/Units";
|
|
import { optionsFromArguments } from "../../core/util/Defaults";
|
|
import { Envelope, EnvelopeOptions } from "./Envelope";
|
|
|
|
/**
|
|
* AmplitudeEnvelope is a Tone.Envelope connected to a gain node.
|
|
* Unlike Tone.Envelope, which outputs the envelope's value, AmplitudeEnvelope accepts
|
|
* an audio signal as the input and will apply the envelope to the amplitude
|
|
* of the signal.
|
|
* Read more about ADSR Envelopes on [Wikipedia](https://en.wikipedia.org/wiki/Synthesizer#ADSR_envelope).
|
|
*
|
|
* @example
|
|
* var ampEnv = new AmplitudeEnvelope({
|
|
* "attack": 0.1,
|
|
* "decay": 0.2,
|
|
* "sustain": 1.0,
|
|
* "release": 0.8
|
|
* }).toDestination();
|
|
* //create an oscillator and connect it
|
|
* var osc = new Tone.Oscillator().connect(ampEnv).start();
|
|
* //trigger the envelopes attack and release "8t" apart
|
|
* ampEnv.triggerAttackRelease("8t");
|
|
* @category Component
|
|
*/
|
|
export class AmplitudeEnvelope extends Envelope {
|
|
|
|
readonly name: string = "AmplitudeEnvelope";
|
|
|
|
private _gainNode: Gain = new Gain({
|
|
context: this.context,
|
|
gain: 0,
|
|
});
|
|
output: Gain = this._gainNode;
|
|
input: Gain = this._gainNode;
|
|
|
|
/**
|
|
* @param attack The amount of time it takes for the envelope to go from 0 to it's maximum value.
|
|
* @param decay The period of time after the attack that it takes for the envelope
|
|
* to fall to the sustain value. Value must be greater than 0.
|
|
* @param sustain The percent of the maximum value that the envelope rests at until
|
|
* the release is triggered.
|
|
* @param release The amount of time after the release is triggered it takes to reach 0.
|
|
* Value must be greater than 0.
|
|
*/
|
|
constructor(attack?: Time, decay?: Time, sustain?: NormalRange, release?: Time);
|
|
constructor(options?: Partial<EnvelopeOptions>)
|
|
constructor() {
|
|
super(optionsFromArguments(AmplitudeEnvelope.getDefaults(), arguments, ["attack", "decay", "sustain", "release"]));
|
|
this._sig.connect(this._gainNode.gain);
|
|
this.output = this._gainNode;
|
|
this.input = this._gainNode;
|
|
}
|
|
|
|
/**
|
|
* Clean up
|
|
*/
|
|
dispose(): this {
|
|
super.dispose();
|
|
this._gainNode.dispose();
|
|
return this;
|
|
}
|
|
}
|