mirror of
https://github.com/Tonejs/Tone.js
synced 2024-11-17 00:58:09 +00:00
133 lines
2.9 KiB
JavaScript
133 lines
2.9 KiB
JavaScript
define(["Tone/core/Tone", "Tone/signal/Add", "Tone/signal/Multiply", "Tone/signal/Signal"], function(Tone){
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"use strict";
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/**
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* @class performs a linear scaling on an input signal.
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* Scales from the input range of inputMin to inputMax
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* to the output range of outputMin to outputMax.
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*
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* @description If only two arguments are provided, the inputMin and inputMax are set to -1 and 1
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*
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* @constructor
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* @extends {Tone}
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* @param {number} inputMin
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* @param {number} inputMax
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* @param {number=} outputMin
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* @param {number=} outputMax
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*/
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Tone.Scale = function(inputMin, inputMax, outputMin, outputMax){
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Tone.call(this);
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//if there are only two args
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if (arguments.length == 2){
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outputMin = inputMin;
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outputMax = inputMax;
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inputMin = -1;
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inputMax = 1;
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}
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/** @private
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@type {number} */
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this._inputMin = inputMin;
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/** @private
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@type {number} */
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this._inputMax = inputMax;
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/** @private
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@type {number} */
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this._outputMin = outputMin;
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/** @private
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@type {number} */
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this._outputMax = outputMax;
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/** @private
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@type {Tone.Add} */
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this._plusInput = new Tone.Add(0);
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/** @private
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@type {Tone.Multiply} */
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this._scale = new Tone.Multiply(1);
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/** @private
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@type {Tone.Add} */
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this._plusOutput = new Tone.Add(0);
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//connections
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this.chain(this.input, this._plusInput, this._scale, this._plusOutput, this.output);
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//set the scaling values
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this._setScalingParameters();
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};
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Tone.extend(Tone.Scale);
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/**
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* set the scaling parameters
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*
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* @private
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*/
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Tone.Scale.prototype._setScalingParameters = function(){
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//components
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this._plusInput.setValue(-this._inputMin);
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this._scale.setValue((this._outputMax - this._outputMin)/(this._inputMax - this._inputMin));
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this._plusOutput.setValue(this._outputMin);
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};
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/**
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* set the input min value
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* @param {number} val
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*/
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Tone.Scale.prototype.setInputMin = function(val){
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this._inputMin = val;
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this._setScalingParameters();
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};
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/**
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* set the input max value
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* @param {number} val
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*/
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Tone.Scale.prototype.setInputMax = function(val){
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this._inputMax = val;
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this._setScalingParameters();
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};
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/**
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* set the output min value
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* @param {number} val
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*/
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Tone.Scale.prototype.setOutputMin = function(val){
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this._outputMin = val;
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this._setScalingParameters();
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};
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/**
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* set the output max value
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* @param {number} val
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*/
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Tone.Scale.prototype.setOutputMax = function(val){
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this._outputMax = val;
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this._setScalingParameters();
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};
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/**
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* borrows connect from {@link Tone.Signal}
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*
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* @function
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*/
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Tone.Scale.prototype.connect = Tone.Signal.prototype.connect;
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/**
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* clean up
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*/
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Tone.Scale.prototype.dispose = function(){
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Tone.prototype.dispose.call(this);
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this._plusInput.dispose();
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this._plusOutput.dispose();
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this._scale.dispose();
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this._plusInput = null;
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this._plusOutput = null;
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this._scale = null;
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};
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return Tone.Scale;
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});
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