// Animator

/* usage

		var element=document.getElementById('yourelement');

		element=element.style;

		var property='width';

		var begin=element.style.width;

		var change=100;

		var time=20;

		var type='inCirc';

		

		var youranimator=new Animator(element:Object,property:String,begin:Number,change:Number,time:Number[,type:Sring]);

		youranimator.addListener(listener:Object,method:String);

		youranimator.run();

*/

phocus.Animator=function(element,property,begin,change,time,type)

{

	this.element=element;

	this.property=property;

	this.begin=begin;

	this.change=change;

	this.time=0;

	this.ttime=time;

	this.type=type;

	this.transform='';

	this.method=null;

	this.object=null;

	

	// listeners details

	this.listeners=new Array();

	

	// if the passed type doesn't exist as a function, set a default type

	if(!this[type])

		this.type='inOutCirc';

}

$pr=phocus.register(phocus.Animator);

// object properties



// registration functions

$pr.register=function(object,method)

{

	this.object=object;

	this.method=method;

}



// animation functions

// t: current time, b: beginning value, c: change in position, d: duration

$pr.inCirc=function(t,b,d,c)

{

	return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;

}

$pr.outCirc=function(t,b,d,c)

{

	return c * Math.sqrt(1 - (t=t/d-1)*t) + b;

}

$pr.inOutCirc=function(t,b,d,c)

{

	if ((t/=d/2) < 1) return -c/2 * (Math.sqrt(1 - t*t) - 1) + b;

	return c/2 * (Math.sqrt(1 - (t-=2)*t) + 1) + b;

}

$pr.inExpo = function (t,b,d,c)

{

	return (t==0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b;

}

$pr.outExpo = function (t,b,d,c)

{

	return (t==d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;

}

$pr.inOutExpo = function (t,b,d,c)

{

	if (t==0) return b;

	if (t==d) return b+c;

	if ((t/=d/2) < 1) return c/2 * Math.pow(2, 10 * (t - 1)) + b;

	return c/2 * (-Math.pow(2, -10 * --t) + 2) + b;

}



// run - responsible for running the animator each tick

$pr.run=function(delay)

{

	if(typeof delay != 'number')

		var delay=0;

	this.run=phocus.Runtime.addrun(this,'execute',null,delay,this.ttime,this,'end');

}

$pr.escape=function()

{

	this.run.r=0;

}

// execute

$pr.execute=function(t,tt)

{

	var _t=tt-t;

	var prop=this[this.type](_t,this.begin,tt,this.change);

	if(this.round==true)

		prop=Math.floor(prop);

	if(this.transform!='')

		prop=this.transform.split('%%val%%').join(prop);

	

	if(typeof this.method == 'string' && typeof this.object != 'undefined')

		this.object[this.method](prop,this.element,this.property);

	else

		this.element[this.property]=prop;

}

// end

$pr.end=function()

{

	for(var i in this.listeners)

		this.listeners[i].listener[this.listeners[i].method](this.change-this.begin,this.element,this.property);

	clearInterval(this.timer);

}

$pr.kill=function()

{

	this.run.escape();

	clearInterval(this.timer);

	this.listeners=null;

}



// adding and removing listeners

$pr.addListener=function(listener,method)

{

	this.listeners.push({listener:listener,method:method});

}

$pr.removelistener=function(listener,method)

{

	for(var i=this.listeners.length-1;i>=0;i--)

	{

		var op=this.listeners[i];

		if(op.listener==listener && op.method==method)

		{

			this.listeners.splice(i,1);

			break;

		}

	}

}