[javascript]jQueryPlugin:ScrollToにFlashのTweenクラスを移植

移植しました。
前に似たようなのを作った気がしますが、今回はjQueryです。
 
サンプル
http://ktyr.net/blog/childpage/jquery/03/index.html
 
移植していない普通のScrollToの使い方はこちら
plugin:ScrollTo 指定エレメントまでスクロールする
 

javascript

$(document).ready(init);
function init(){
	$.easing.easeNone=function(x, t, b, c, d) {
		return c * t / d + b;
	};

	$.easing.RegularEaseOut=function(x, t,b,c,d){
		return -c * (t /= d) * (t - 2) + b;
	};
	$.easing.RegularEaseIn=function(x, t,b,c,d){
		return c * (t /= d) * t + b;
	};
	$.easing.RegularEaseInOut=function(x, t,b,c,d){
		if((t /= d / 2) < 1)return c / 2 * t * t + b;
		return -c / 2 * ((--t) * (t - 2) - 1) + b;
	};

	$.easing.StrongEaseOut=function(x, t,b,c,d){
		return c * ((t = t / d - 1) * t * t * t * t + 1) + b;
	};
	$.easing.StrongEaseIn=function(x, t,b,c,d){
		return c * (t /= d) * t * t * t * t + b;
	};
	$.easing.StrongEaseInOut=function(x, 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;
	};

	$.easing.ElasticEaseOut=function(x, t,b,c,d){
		if(t == 0)return b;
		if((t /= d) == 1)return b + c;
		var p = d * 0.3;
		var a=c;
		var s = p / 4;
		return a * Math.pow(2, -10 * t) *Math.sin((t * d - s) * (2 * Math.PI) / p) + c + b;
	};
	$.easing.ElasticEaseIn=function(x, t,b,c,d){
		if(t==0)return b;
		if((t /= d) == 1)return b + c;
		var p=d * 0.3;
		var a=c;
		var s=p/4;
		return -(a * Math.pow(2, 10 * (t -= 1)) *Math.sin((t * d - s) * (2 * Math.PI) / p)) + b;
	};
	$.easing.ElasticEaseInOut=function(x, t,b,c,d){
		if (t == 0)return b;
		if ((t /= d / 2) == 2)return b + c;
		var p = d * (0.3 * 1.5);
		var a=c;
		var s=p/4;
		if (t < 1)return -0.5 * (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 ) * 0.5 + c + b;
	};

	$.easing.BounceEaseOut=function(x, 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 + 0.75) + b;
		}else if (t < (2.5 / 2.75)){
			return c * (7.5625 * (t -= (2.25 / 2.75)) * t + 0.9375) + b;
		}else{
			return c * (7.5625 * (t -= (2.625 / 2.75)) * t + 0.984375) + b;
		}
	};
	$.easing.BounceEaseIn=function(x, t,b,c,d){
		return c - $.easing.BounceEaseOut(x,d - t, 0, c, d) + b;
	};
	$.easing.BounceEaseInOut=function(x, t,b,c,d){
		if (t < d/2){
			return $.easing.BounceEaseIn(x,t * 2, 0, c, d) * 0.5 + b;
		}else{
			return $.easing.BounceEaseOut(x,t * 2 - d, 0, c, d) * 0.5 + c * 0.5 + b;
		}
	};

	$.easing.BackEaseOut=function(x, t,b,c,d){
		var s = 1.70158;
		return c * ((t = t / d - 1) * t * ((s + 1) * t + s) + 1) + b;
	};
	$.easing.BackEaseIn=function(x, t,b,c,d){
		var s = 1.70158;
		return c * (t /= d) * t * ((s + 1) * t - s) + b;
	};
	$.easing.BackEaseInOut=function(x, t,b,c,d){
		var 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;
	};

	$('div#main a').click(when_a_release);
	$.scrollTo('#top', 0);
}
function when_a_release(){
	$.scrollTo(this.hash, 800, {easing:this.innerHTML.split(" ").pop()});
	return false;
}

 
参考にしたサイト
 
Ariel Flesler: jQuery.ScrollTo
http://flesler.blogspot.com/2007/10/jqueryscrollto.html
 
ScrollTo | jQuery Plugins
http://plugins.jquery.com/project/ScrollTo