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https://github.com/Tonejs/Tone.js
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103 lines
2.5 KiB
JavaScript
103 lines
2.5 KiB
JavaScript
define(["Tone/core/Tone", "Tone/signal/Scale", "Tone/signal/Pow"],
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function(Tone){
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/**
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* @class Performs an exponential scaling on an input signal.
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* Scales a NormalRange value [0,1] exponentially
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* to the output range of outputMin to outputMax.
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*
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* @constructor
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* @extends {Tone.SignalBase}
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* @param {number} [outputMin=0] The output value when the input is 0.
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* @param {number} [outputMax=1] The output value when the input is 1.
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* @param {number} [exponent=2] The exponent which scales the incoming signal.
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* @example
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* var scaleExp = new Tone.ScaleExp(0, 100, 2);
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* var signal = new Tone.Signal(0.5).connect(scaleExp);
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*/
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Tone.ScaleExp = function(outputMin, outputMax, exponent){
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/**
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* scale the input to the output range
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* @type {Tone.Scale}
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* @private
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*/
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this._scale = this.output = new Tone.Scale(outputMin, outputMax);
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/**
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* @private
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* @type {Tone.Pow}
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* @private
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*/
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this._exp = this.input = new Tone.Pow(this.defaultArg(exponent, 2));
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this._exp.connect(this._scale);
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};
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Tone.extend(Tone.ScaleExp, Tone.SignalBase);
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/**
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* Instead of interpolating linearly between the <code>min</code> and
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* <code>max</code> values, setting the exponent will interpolate between
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* the two values with an exponential curve.
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* @memberOf Tone.ScaleExp#
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* @type {number}
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* @name exponent
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*/
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Object.defineProperty(Tone.ScaleExp.prototype, "exponent", {
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get : function(){
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return this._exp.value;
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},
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set : function(exp){
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this._exp.value = exp;
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}
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});
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/**
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* The minimum output value. This number is output when
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* the value input value is 0.
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* @memberOf Tone.ScaleExp#
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* @type {number}
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* @name min
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*/
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Object.defineProperty(Tone.ScaleExp.prototype, "min", {
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get : function(){
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return this._scale.min;
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},
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set : function(min){
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this._scale.min = min;
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}
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});
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/**
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* The maximum output value. This number is output when
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* the value input value is 1.
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* @memberOf Tone.ScaleExp#
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* @type {number}
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* @name max
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*/
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Object.defineProperty(Tone.ScaleExp.prototype, "max", {
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get : function(){
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return this._scale.max;
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},
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set : function(max){
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this._scale.max = max;
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}
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});
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/**
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* Clean up.
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* @returns {Tone.ScaleExp} this
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*/
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Tone.ScaleExp.prototype.dispose = function(){
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Tone.prototype.dispose.call(this);
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this._scale.dispose();
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this._scale = null;
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this._exp.dispose();
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this._exp = null;
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return this;
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};
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return Tone.ScaleExp;
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});
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