/**

 * Interface Elements for jQuery

 * FX - scroll to

 * 

 * http://interface.eyecon.ro

 * 

 * Copyright (c) 2006 Stefan Petre

 * Dual licensed under the MIT (MIT-LICENSE.txt) 

 * and GPL (GPL-LICENSE.txt) licenses.

 *   

 *

 */

/**

 * Applies a scrolling effect to document until the element gets into viewport

 */

jQuery.fn.extend (

	{

		/**

		 * @name ScrollTo

		 * @description scrolls the document until the lement gets into viewport

		 * @param Mixed speed animation speed, integer for miliseconds, string ['slow' | 'normal' | 'fast']

		 * @param String axis (optional) whatever to scroll on vertical, horizontal or both axis ['vertical'|'horizontal'|null]

		 * @param String easing (optional) The name of the easing effect that you want to use.

		 * @type jQuery

		 * @cat Plugins/Interface

		 * @author Stefan Petre

		 */

		ScrollTo : function(speed, axis, easing) {

			o = jQuery.speed(speed);

			return this.queue('interfaceFX',function(){

				new jQuery.fx.ScrollTo(this, o, axis, easing);

			});

		},

		/**

		 * @name ScrollToAnchors

		 * @description all links to '#elementId' will animate scroll

		 * @param Mixed speed animation speed, integer for miliseconds, string ['slow' | 'normal' | 'fast']

		 * @param String axis (optional) whatever to scroll on vertical, horizontal or both axis ['vertical'|'horizontal'|null]

		 * @param String easing (optional) The name of the easing effect that you want to use.

		 * @type jQuery

		 * @cat Plugins/Interface

		 * @author Stefan Petre

		 */

		/*inspired by David Maciejewski www.macx.de*/

		ScrollToAnchors : function(speed, axis, easing) {

			return this.each(

				function()

				{

					jQuery('a[@href*="#"]', this).click(

						function(e)

						{

							parts = this.href.split('#');

							jQuery('#' + parts[1]).ScrollTo(speed, axis, easing);

							return false;

						}

					);

				}

			)

		}

	}

);

jQuery.fx.ScrollTo = function (e, o, axis, easing)

{

	var z = this;

	z.o = o;

	z.e = e;

	z.axis = /vertical|horizontal/.test(axis) ? axis : false;

	z.easing = easing;

	p = jQuery.iUtil.getPosition(e);

	s = jQuery.iUtil.getScroll();

	z.clear = function(){clearInterval(z.timer);z.timer=null;jQuery.dequeue(z.e, 'interfaceFX');};

	z.t=(new Date).getTime();

	s.h = s.h > s.ih ? (s.h - s.ih) : s.h;

	s.w = s.w > s.iw ? (s.w - s.iw) : s.w;

	z.endTop = p.y > s.h ? s.h : p.y;

	z.endLeft = p.x > s.w ? s.w : p.x;

	z.startTop = s.t;

	z.startLeft = s.l;

	z.step = function(){

		var t = (new Date).getTime();

		var n = t - z.t;

		var p = n / z.o.duration;

		if (t >= z.o.duration+z.t) {

			z.clear();

			setTimeout(function(){z.scroll(z.endTop, z.endLeft)},13);

		} else {

			if (!z.axis || z.axis == 'vertical') {

				if (!jQuery.easing || !jQuery.easing[z.easing]) {

					st = ((-Math.cos(p*Math.PI)/2) + 0.5) * (z.endTop-z.startTop) + z.startTop;

				} else {

					st = jQuery.easing[z.easing](p, n, z.startTop, (z.endTop - z.startTop), z.o.duration);

				}

			} else {

				st = z.startTop;

			}

			if (!z.axis || z.axis == 'horizontal') {

				if (!jQuery.easing || !jQuery.easing[z.easing]) {

					sl = ((-Math.cos(p*Math.PI)/2) + 0.5) * (z.endLeft-z.startLeft) + z.startLeft;

				} else {

					sl = jQuery.easing[z.easing](p, n, z.startLeft, (z.endLeft - z.startLeft), z.o.duration);

				}

			} else {

				sl = z.startLeft;

			}

			z.scroll(st, sl);

		}

	};

	z.scroll = function (t, l){window.scrollTo(l, t);};

	z.timer=setInterval(function(){z.step();},13);

};