Tone.js/Tone/signal/Negate.js

import Tone from "../core/Tone";
import "../signal/Multiply";
import "../signal/Signal";

/**
 *  @class Negate the incoming signal. i.e. an input signal of 10 will output -10
 *
 *  @constructor
 *  @extends {Tone.SignalBase}
 *  @example
 * var neg = new Tone.Negate();
 * var sig = new Tone.Signal(-2).connect(neg);
 * //output of neg is positive 2. 
 */
Tone.Negate = function(){

	Tone.SignalBase.call(this);
	/**
	 *  negation is done by multiplying by -1
	 *  @type {Tone.Multiply}
	 *  @private
	 */
	this._multiply = this.input = this.output = new Tone.Multiply(-1);
};

Tone.extend(Tone.Negate, Tone.SignalBase);

/**
 *  clean up
 *  @returns {Tone.Negate} this
 */
Tone.Negate.prototype.dispose = function(){
	Tone.SignalBase.prototype.dispose.call(this);
	this._multiply.dispose();
	this._multiply = null;
	return this;
}; 

export default Tone.Negate;