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FatOscillator.js
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FatOscillator.js
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define(["Tone/core/Tone", "Tone/source/Source", "Tone/source/Oscillator",
"Tone/signal/Multiply", "Tone/core/Gain"], function(Tone){
"use strict";
/**
* @class Tone.FatOscillator
*
* @extends {Tone.Source}
* @constructor
* @param {Frequency} frequency The starting frequency of the oscillator.
* @param {String} type The type of the carrier oscillator.
* @param {String} modulationType The type of the modulator oscillator.
* @example
* //a sine oscillator frequency-modulated by a square wave
* var fmOsc = new Tone.FatOscillator("Ab3", "sine", "square").toMaster().start();
*/
Tone.FatOscillator = function(){
var options = Tone.defaults(arguments, ["frequency", "type", "spread"], Tone.FatOscillator);
Tone.Source.call(this, options);
/**
* The oscillator's frequency
* @type {Frequency}
* @signal
*/
this.frequency = new Tone.Signal(options.frequency, Tone.Type.Frequency);
/**
* The detune control signal.
* @type {Cents}
* @signal
*/
this.detune = new Tone.Signal(options.detune, Tone.Type.Cents);
/**
* The array of oscillators
* @type {Array}
* @private
*/
this._oscillators = [];
/**
* The total spread of the oscillators
* @type {Cents}
* @private
*/
this._spread = options.spread;
/**
* The type of the oscillator
* @type {String}
* @private
*/
this._type = options.type;
/**
* The phase of the oscillators
* @type {Degrees}
* @private
*/
this._phase = options.phase;
/**
* The partials array
* @type {Array}
* @private
*/
this._partials = Tone.defaultArg(options.partials, []);
//set the count initially
this.count = options.count;
this._readOnly(["frequency", "detune"]);
};
Tone.extend(Tone.FatOscillator, Tone.Source);
/**
* default values
* @static
* @type {Object}
* @const
*/
Tone.FatOscillator.defaults = {
"frequency" : 440,
"detune" : 0,
"phase" : 0,
"spread" : 20,
"count" : 3,
"type" : "sawtooth"
};
/**
* start the oscillator
* @param {Time} [time=now]
* @private
*/
Tone.FatOscillator.prototype._start = function(time){
time = this.toSeconds(time);
this._forEach(function(osc){
osc.start(time);
});
};
/**
* stop the oscillator
* @param {Time} [time=now]
* @private
*/
Tone.FatOscillator.prototype._stop = function(time){
time = this.toSeconds(time);
this._forEach(function(osc){
osc.stop(time);
});
};
/**
* restart the oscillator
* @param {Time} time (optional) timing parameter
* @private
*/
Tone.FatOscillator.prototype.restart = function(time){
time = this.toSeconds(time);
this._forEach(function(osc){
osc.restart(time);
});
};
/**
* Iterate over all of the oscillators
* @param {Function} iterator The iterator function
* @private
*/
Tone.FatOscillator.prototype._forEach = function(iterator){
for (var i = 0; i < this._oscillators.length; i++){
iterator.call(this, this._oscillators[i], i);
}
};
/**
* The type of the carrier oscillator
* @memberOf Tone.FatOscillator#
* @type {string}
* @name type
*/
Object.defineProperty(Tone.FatOscillator.prototype, "type", {
get : function(){
return this._type;
},
set : function(type){
this._type = type;
this._forEach(function(osc){
osc.type = type;
});
}
});
/**
* The detune spread between the oscillators. If "count" is
* set to 3 oscillators and the "spread" is set to 40,
* the three oscillators would be detuned like this: [-20, 0, 20]
* for a total detune spread of 40 cents.
* @memberOf Tone.FatOscillator#
* @type {Cents}
* @name spread
*/
Object.defineProperty(Tone.FatOscillator.prototype, "spread", {
get : function(){
return this._spread;
},
set : function(spread){
this._spread = spread;
if (this._oscillators.length > 1){
var start = -spread/2;
var step = spread / (this._oscillators.length - 1);
this._forEach(function(osc, i){
osc.detune.value = start + step * i;
});
}
}
});
/**
* The number of detuned oscillators
* @memberOf Tone.FatOscillator#
* @type {Number}
* @name count
*/
Object.defineProperty(Tone.FatOscillator.prototype, "count", {
get : function(){
return this._oscillators.length;
},
set : function(count){
count = Math.max(count, 1);
if (this._oscillators.length !== count){
// var partials = this.partials;
// var type = this.type;
//dispose the previous oscillators
this._forEach(function(osc){
osc.dispose();
});
this._oscillators = [];
for (var i = 0; i < count; i++){
var osc = new Tone.Oscillator();
if (this.type === Tone.Oscillator.Type.Custom){
osc.partials = this._partials;
} else {
osc.type = this._type;
}
osc.phase = this._phase;
osc.volume.value = -6 - count*1.1;
this.frequency.connect(osc.frequency);
this.detune.connect(osc.detune);
osc.connect(this.output);
this._oscillators[i] = osc;
}
//set the spread
this.spread = this._spread;
if (this.state === Tone.State.Started){
this._forEach(function(osc){
osc.start();
});
}
}
}
});
/**
* The phase of the oscillator in degrees.
* @memberOf Tone.FatOscillator#
* @type {Number}
* @name phase
*/
Object.defineProperty(Tone.FatOscillator.prototype, "phase", {
get : function(){
return this._phase;
},
set : function(phase){
this._phase = phase;
this._forEach(function(osc){
osc.phase = phase;
});
}
});
/**
* The partials of the carrier waveform. A partial represents
* the amplitude at a harmonic. The first harmonic is the
* fundamental frequency, the second is the octave and so on
* following the harmonic series.
* Setting this value will automatically set the type to "custom".
* The value is an empty array when the type is not "custom".
* @memberOf Tone.FatOscillator#
* @type {Array}
* @name partials
* @example
* osc.partials = [1, 0.2, 0.01];
*/
Object.defineProperty(Tone.FatOscillator.prototype, "partials", {
get : function(){
return this._partials;
},
set : function(partials){
this._partials = partials;
this._type = Tone.Oscillator.Type.Custom;
this._forEach(function(osc){
osc.partials = partials;
});
}
});
/**
* Clean up.
* @return {Tone.FatOscillator} this
*/
Tone.FatOscillator.prototype.dispose = function(){
Tone.Source.prototype.dispose.call(this);
this._writable(["frequency", "detune"]);
this.frequency.dispose();
this.frequency = null;
this.detune.dispose();
this.detune = null;
this._forEach(function(osc){
osc.dispose();
});
this._oscillators = null;
this._partials = null;
return this;
};
return Tone.FatOscillator;
});