Sequence

gistfile1.js

var Sequence = function (delay) {
    EventEmitter.apply(this);

    this.minDelay = 1000;
    this.maxDelay = 3000;

    this.delay = delay;
    this.delayInterval = 10; // 10th of a second
}

sys.inherits(Sequence, EventEmitter);

Sequence.prototype.start = function () {
    var that = this;
    this.on('clockTick', function () {
        setTimeout(function () {
            that.emit('tick');
            that.emit('clockTick');
        }, that.delay);
    });

    this.emit('clockTick');
}
Sequence.prototype.incrementDelay = function () {
    if (this.delay < this.maxDelay) {
        this.delay += this.delayInterval;
    }
}

Sequence.prototype.decrementDelay = function () {
    if (this.delay > this.minDelay) {
        this.delay -= this.delayInterval;
    }
}

Sequence.prototype.stop = function () {
    this.removeAllListeners('clockTick');
}

exports.Sequence = Sequence;