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get the time till the next beat

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useful for the eventual quantization
This commit is contained in:
Yotam Mann 2014-11-30 22:40:07 -05:00
parent 25496dea77
commit c8478192e1
1 changed files with 20 additions and 5 deletions
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25
Tone/core/Transport.js
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@ -460,6 +460,23 @@ function(Tone){
this._setTicks(ticks);
};
/**
* returns the time of the next beat
* @param {string} [subdivision="4n"]
* @return {number} the time in seconds of the next subdivision
*/
Tone.Transport.prototype.nextBeat = function(subdivision){
subdivision = this.defaultArg(subdivision, "4n");
var tickNum = this.toTicks(subdivision);
var remainingTicks = (transportTicks % tickNum);
var nextTick = remainingTicks;
if (remainingTicks > 0){
nextTick = tickNum - remainingTicks;
}
return this.ticksToSeconds(nextTick);
};
///////////////////////////////////////////////////////////////////////////////
// START/STOP/PAUSE
///////////////////////////////////////////////////////////////////////////////
@ -819,7 +836,6 @@ function(Tone){
};
})();
/**
*
* convert notation format strings to seconds
@ -958,7 +974,6 @@ function(Tone){
* TransportTime: 2:4:1 (measure:quarters:sixteens)
* Now Relative: +3n
* Math: 3n+16n or even very complicated expressions ((3n*2)/6 + 1)
* Ticks: "146i"
*
* @override
* @param {Tone.Time} time
@ -974,11 +989,11 @@ function(Tone){
var plusTime = 0;
if(time.charAt(0) === "+") {
plusTime = now;
time = time.slice(1);
time = time.slice(1);
}
var components = time.split(/[\(\)\-\+\/\*]/);
if (components.length > 1){
var oringalTime = time;
var originalTime = time;
for(var i = 0; i < components.length; i++){
var symb = components[i].trim();
if (symb !== ""){
@ -990,7 +1005,7 @@ function(Tone){
//i know eval is evil, but i think it's safe here
time = eval(time); // jshint ignore:line
} catch (e){
throw new EvalError("problem evaluating Tone.Time: "+oringalTime);
throw new EvalError("problem evaluating Tone.Time: "+originalTime);
}
} else if (this.isNotation(time)){
time = this.notationToSeconds(time);