gistfile1.txt

    Crafty.c("Metronome", {
      _bpm: 85,
      _resolution: 64,
      _beatsPerBar: 4,
      _period: function() {
        var beatPeriod = (60000 / this._bpm) / (this._resolution / this._beatsPerBar);
        return beatPeriod;
      },
      _startTime: 0,
      _timeNow: 0,
      _ticksElapsed: '0.0',
      init: function() {
        this._startTime = new Date().getTime();
        this._tick();
      },
      _tick: function() {
        Crafty.trigger("MetronomeTick");
        this._timeNow += this._period();
        this._ticksElapsed = Math.floor(this._timeNow / this._period()) / 10;
        if(Math.round(this._ticksElapsed) == this._ticksElapsed) { this._ticksElapsed += '.0'; }
        var difference = (new Date().getTime() - this._startTime) - this._timeNow;
        var thisMetronome = this;
        window.setTimeout(function() { thisMetronome._tick(); }, (this._period() - difference));
      }
    });