/*
// Tweener Like snippet
new Tween(div.style,{time:1, onComplete:function(){},left:{to:0,from:100,tmpl:"+$#px"}});
// @require http://gist.github.com/13572.txt
*/


function Tween(item, opt) {
var self = this,
TIME = 10,
time = (opt.time||1) * 1000, TM_EXP = /(\+)?\$([\#\d])/g, sets = [],
easing = easingFunctions[opt.transition] || function(t, b, c, d){ return c*t/d + b; },
_T = { time:1, onComplete:1, transition:1, delay:1 };

for (var k in opt) if (!_T[k]) {
var set = opt[k],
from = set.from || parseFloat(item[k]) || 0,
values = [],
tmpl = set.tmpl || '$#';
sets.push( {key:k, from:from, to:set.to, tmpl:tmpl} );
}

var L = sets.length,
delay = opt.delay*1000 || 0,
startTime = new Date()*1 + delay,
endTime = time + startTime,
dist = endTime - startTime,

run = function(){
var now = new Date()*1,
tim = now - startTime;
for (var k = 0; k < L; ++k) {
var set = sets[k], val = easing(tim, set.from, set.to - set.from, dist);
item[set.key] = set.tmpl.replace(TM_EXP, function(m, p, m1){ return p && val < 0 ? 0 : (m1 == '#' ? val : val.toFixed(m1)); });
}
if (tim <= dist) { setTimeout(function(){ run.call(self); },TIME); }
else{
for(var k = 0; k < L; ++k) { item[sets[k].key] = sets[k].tmpl.replace(TM_EXP, sets[k].to); }
if(typeof opt.onComplete == 'function') opt.onComplete(item);
}
};

delay ? setTimeout(function(){run();},delay) : run(0);
}


easingFunctions = {
    easeNone: function(t, b, c, d) {
        return c*t/d + b;
    },
    easeInQuad: function(t, b, c, d) {
        return c*(t/=d)*t + b;
    },
    easeOutQuad: function(t, b, c, d) {
        return -c *(t/=d)*(t-2) + b;
    },    
    easeInOutQuad: function(t, b, c, d) {
        if((t/=d/2) < 1) return c/2*t*t + b;
        return -c/2 *((--t)*(t-2) - 1) + b;
    },    
    easeInCubic: function(t, b, c, d) {
        return c*(t/=d)*t*t + b;
    },    
    easeOutCubic: function(t, b, c, d) {
        return c*((t=t/d-1)*t*t + 1) + b;
    },    
    easeInOutCubic: function(t, b, c, d) {
        if((t/=d/2) < 1) return c/2*t*t*t + b;
        return c/2*((t-=2)*t*t + 2) + b;
    },    
    easeOutInCubic: function(t, b, c, d) {
        if(t < d/2) return easingFunctions.easeOutCubic(t*2, b, c/2, d);
        return easingFunctions.easeInCubic((t*2)-d, b+c/2, c/2, d);
    },    
    easeInQuart: function(t, b, c, d) {
        return c*(t/=d)*t*t*t + b;
    },    
    easeOutQuart: function(t, b, c, d) {
        return -c *((t=t/d-1)*t*t*t - 1) + b;
    },    
    easeInOutQuart: function(t, b, c, d) {
        if((t/=d/2) < 1) return c/2*t*t*t*t + b;
        return -c/2 *((t-=2)*t*t*t - 2) + b;
    },    
    easeOutInQuart: function(t, b, c, d) {
        if(t < d/2) return easingFunctions.easeOutQuart(t*2, b, c/2, d);
        return easingFunctions.easeInQuart((t*2)-d, b+c/2, c/2, d);
    },    
    easeInQuint: function(t, b, c, d) {
        return c*(t/=d)*t*t*t*t + b;
    },    
    easeOutQuint: function(t, b, c, d) {
        return c*((t=t/d-1)*t*t*t*t + 1) + b;
    },    
    easeInOutQuint: function(t, b, c, d) {
        if((t/=d/2) < 1) return c/2*t*t*t*t*t + b;
        return c/2*((t-=2)*t*t*t*t + 2) + b;
    },    
    easeOutInQuint: function(t, b, c, d) {
        if(t < d/2) return easingFunctions.easeOutQuint(t*2, b, c/2, d);
        return easingFunctions.easeInQuint((t*2)-d, b+c/2, c/2, d);
    },    
    easeInSine: function(t, b, c, d) {
        return -c * Math.cos(t/d *(Math.PI/2)) + c + b;
    },    
    easeOutSine: function(t, b, c, d) {
        return c * Math.sin(t/d *(Math.PI/2)) + b;
    },    
    easeInOutSine: function(t, b, c, d) {
        return -c/2 *(Math.cos(Math.PI*t/d) - 1) + b;
    },    
    easeOutInSine: function(t, b, c, d) {
        if(t < d/2) return easingFunctions.easeOutSine(t*2, b, c/2, d);
        return easingFunctions.easeInSine((t*2)-d, b+c/2, c/2, d);
    },    
    easeInExpo: function(t, b, c, d) {
        return(t==0) ? b : c * Math.pow(2, 10 *(t/d - 1)) + b - c * 0.001;
    },    
    easeOutExpo: function(t, b, c, d) {
        return(t==d) ? b+c : c * 1.001 *(-Math.pow(2, -10 * t/d) + 1) + b;
    },    
    easeInOutExpo: function(t, b, c, d) {
        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 - c * 0.0005;
        return c/2 * 1.0005 *(-Math.pow(2, -10 * --t) + 2) + b;
    },    
    easeOutInExpo: function(t, b, c, d) {
        if(t < d/2) return easingFunctions.easeOutExpo(t*2, b, c/2, d);
        return easingFunctions.easeInExpo((t*2)-d, b+c/2, c/2, d);
    },    
    easeInCirc: function(t, b, c, d) {
        return -c *(Math.sqrt(1 -(t/=d)*t) - 1) + b;
    },    
    easeOutCirc: function(t, b, c, d) {
        return c * Math.sqrt(1 -(t=t/d-1)*t) + b;
    },    
    easeInOutCirc: function(t, b, c, d) {
        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;
    },    
    easeOutInCirc: function(t, b, c, d) {
        if(t < d/2) return easingFunctions.easeOutCirc(t*2, b, c/2, d);
        return easingFunctions.easeInCirc((t*2)-d, b+c/2, c/2, d);
    },    
    easeInElastic: function(t, b, c, d, a, p) {
        var s;
        if(t==0) return b;  if((t/=d)==1) return b+c;  if(!p) p=d*.3;
        if(!a || a < Math.abs(c)) { a=c; s=p/4; } else s = p/(2*Math.PI) * Math.asin(c/a);
        return -(a*Math.pow(2,10*(t-=1)) * Math.sin((t*d-s)*(2*Math.PI)/p )) + b;
    },    
    easeOutElastic: function(t, b, c, d, a, p) {
        var s;
        if(t==0) return b;  if((t/=d)==1) return b+c;  if(!p) p=d*.3;
        if(!a || a < Math.abs(c)) { a=c; s=p/4; } else s = p/(2*Math.PI) * Math.asin(c/a);
        return(a*Math.pow(2,-10*t) * Math.sin((t*d-s)*(2*Math.PI)/p ) + c + b);
    },    
    easeInOutElastic: function(t, b, c, d, a, p) {
        var s;
        if(t==0) return b;  if((t/=d/2)==2) return b+c;  if(!p) p=d*(.3*1.5);
        if(!a || a < Math.abs(c)) { a=c; s=p/4; }       else s = p/(2*Math.PI) * Math.asin(c/a);
        if(t < 1) return -.5*(a*Math.pow(2,10*(t-=1)) * Math.sin((t*d-s)*(2*Math.PI)/p )) + b;
        return a*Math.pow(2,-10*(t-=1)) * Math.sin((t*d-s)*(2*Math.PI)/p )*.5 + c + b;
    },    
    easeOutInElastic: function(t, b, c, d, a, p) {
        if(t < d/2) return easingFunctions.easeOutElastic(t*2, b, c/2, d, a, p);
        return easingFunctions.easeInElastic((t*2)-d, b+c/2, c/2, d, a, p);
    },    
    easeInBack: function(t, b, c, d, s) {
        if(s == undefined) s = 1.70158;
        return c*(t/=d)*t*((s+1)*t - s) + b;
    },    
    easeOutBack: function(t, b, c, d, s) {
        if(s == undefined) s = 1.70158;
        return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
    },    
    easeInOutBack: function(t, b, c, d, s) {
        if(s == undefined) s = 1.70158;
        if((t/=d/2) < 1) return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b;
        return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;
    },    
    easeOutInBack: function(t, b, c, d, s) {
        if(t < d/2) return easingFunctions.easeOutBack(t*2, b, c/2, d, s);
        return easingFunctions.easeInBack((t*2)-d, b+c/2, c/2, d, s);
    },    
    easeInBounce: function(t, b, c, d) {
        return c - easingFunctions.easeOutBounce(d-t, 0, c, d) + b;
    },    
    easeOutBounce: function(t, b, c, d) {
        if((t/=d) <(1/2.75)) {
            return c*(7.5625*t*t) + b;
        } else if(t <(2/2.75)) {
            return c*(7.5625*(t-=(1.5/2.75))*t + .75) + b;
        } else if(t <(2.5/2.75)) {
            return c*(7.5625*(t-=(2.25/2.75))*t + .9375) + b;
        } else {
            return c*(7.5625*(t-=(2.625/2.75))*t + .984375) + b;
        }
    },    
    easeInOutBounce: function(t, b, c, d) {
        if(t < d/2) return easingFunctions.easeInBounce(t*2, 0, c, d) * .5 + b;
        else return easingFunctions.easeOutBounce(t*2-d, 0, c, d) * .5 + c*.5 + b;
    },    
    easeOutInBounce: function(t, b, c, d) {
        if(t < d/2) return easingFunctions.easeOutBounce(t*2, b, c/2, d);
        return easingFunctions.easeInBounce((t*2)-d, b+c/2, c/2, d);
    }
};