mirror of
https://github.com/Tonejs/Tone.js
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99 lines
No EOL
2.7 KiB
JavaScript
99 lines
No EOL
2.7 KiB
JavaScript
define(["Tone/core/Tone", "Tone/core/Transport", "Tone/signal/Signal"],
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function(Tone){
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/**
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* Oscillator
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*
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* Oscilator with start, pause, stop and sync to Transport
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*
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* @constructor
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* @param {number=} freq starting frequency
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* @param {string=} type type of oscillator (sine|square|triangle|sawtooth)
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*/
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Tone.Oscillator = function(freq, type){
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//components
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this.output = this.context.createGain();
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this.oscillator = this.context.createOscillator();
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this.control = new Tone.Signal(this.defaultArg(this.toFrequency(freq), 440));
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//connections
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this.oscillator.connect(this.output);
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//parameters
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this.oscillator.type = this.defaultArg(type, "sine");
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this.isSynced = false;
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};
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Tone.extend(Tone.Oscillator);
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/**
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* start the oscillator
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*
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* @param {Tone.Time} time
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*/
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Tone.Oscillator.prototype.start = function(time){
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//get previous values
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var type = this.oscillator.type;
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var detune = this.oscillator.frequency.value;
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//new oscillator with previous values
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this.oscillator = this.context.createOscillator();
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this.oscillator.type = type;
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this.oscillator.detune.value = detune;
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//connect the control signal to the oscillator frequency
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this.oscillator.connect(this.output);
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this.control.connect(this.oscillator.frequency);
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this.oscillator.frequency.value = 0;
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//start the oscillator
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this.oscillator.start(this.toSeconds(time));
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};
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/**
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* Sync the oscillator to the transport
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*
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* the current ratio between the oscillator and the Transport BPM
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* is fixed and any change to the Transport BPM will change this
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* oscillator in that same ratio
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*
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* Transport start/pause/stop will also start/pause/stop the oscillator
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*/
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Tone.Oscillator.prototype.sync = function(){
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Tone.Transport.sync(this, this.control);
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};
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/**
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* unsync the oscillator from the Transport
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*/
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Tone.Oscillator.prototype.unsync = function(){
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Tone.Transport.unsync(this);
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this.control.unsync();
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};
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/**
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* stop the oscillator
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* @param {Tone.Time=} time (optional) timing parameter
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*/
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Tone.Oscillator.prototype.stop = function(time){
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this.oscillator.stop(this.toSeconds(time));
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};
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/**
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* exponentially ramp the frequency of the oscillator over the rampTime
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*
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* @param {number} val the frequency
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* @param {Tone.Time} rampTime when the oscillator will arrive at the frequency
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*/
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Tone.Oscillator.prototype.setFrequency = function(val, rampTime){
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this.control.exponentialRampToValueAtTime(this.toFrequency(val), this.toSeconds(rampTime));
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};
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/**
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* set the oscillator type
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* @param {string} type (sine|square|triangle|sawtooth)
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*/
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Tone.Oscillator.prototype.setType = function(type){
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this.oscillator.type = type;
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};
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return Tone.Oscillator;
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}); |