setInterval controller

cycle.js

var Cycle = function(interval) {
	if (interval) this.interval = interval;
};
Cycle.prototype = {
	queue     : null,
	timer     : null,
	interval  : 500,
	start_time: 0,

	start: function() {
		var self = this;
		this.stop();
		this.start_time = +(new Date);
		this.timer = setInterval(function() {
			for (var i = 0, l = self.queue.length; i < l; i++) {
				var q = self.queue[i];
				if (!q) continue;
				var method = q.method;
				if (typeof method != 'function') this.remove(i);
				else {
					q.times = (q.times ? q.times++ : 1);
					q.progress = +(new Date) - self.start_time;
					method(q.times, q.progress);
				}
			}
		}, this.interval);
	},

	stop: function() {
		clearInterval(this.timer);
	},

	add: function(q) {
		if (!this.queue) this.queue = [];

		if (typeof q == 'function') q = { method: q };
		this.queue.push(q);
		return this.queue.length - 1;
	},

	remove: function(n) {
		if (!this.queue) return;
		if (typeof n == 'function') {
			var f = n;
			n = -1;
			for (var i = 0, l = this.queue.length; i < l; i++) {
				var q = this.queue[i];
				if (f === q.method) {
					n = i;
					break;
				}
			}
		}
		delete this.queue[n];
	}
};