/**
 * Interface Elements for jQuery
 * 3D Carousel
 * 
 * http://interface.eyecon.ro
 * 
 * Copyright (c) 2006 Stefan Petre
 * Dual licensed under the MIT (MIT-LICENSE.txt) 
 * and GPL (GPL-LICENSE.txt) licenses.
 *
 */
jQuery.iCarousel = {
	
	build : function(options)
	{
		return this.each(
			function()
			{
				var el = this;
				var increment = 2*Math.PI/360;
				var maxRotation = 2*Math.PI;
				if(jQuery(el).css('position') != 'relative' && jQuery(el).css('position') != 'absolute') {
					jQuery(el).css('position', 'relative');
				}
				el.carouselCfg = {
					items : jQuery(options.items, this),
					itemWidth : options.itemWidth,
					itemHeight : options.itemHeight,
					itemMinWidth : options.itemMinWidth,
					maxRotation : maxRotation,
					size : jQuery.iUtil.getSize(this),
					position : jQuery.iUtil.getPosition(this),
					start : Math.PI/2,
					rotationSpeed : options.rotationSpeed,
					reflectionSize : options.reflections,
					reflections : [],
					protectRotation : false,
					increment: 2*Math.PI/360
				};
				el.carouselCfg.radiusX = (el.carouselCfg.size.w - el.carouselCfg.itemWidth)/2;
				el.carouselCfg.radiusY =  (el.carouselCfg.size.h - el.carouselCfg.itemHeight - el.carouselCfg.itemHeight * el.carouselCfg.reflectionSize)/2;
				el.carouselCfg.step =  2*Math.PI/el.carouselCfg.items.size();
				el.carouselCfg.paddingX = el.carouselCfg.size.w/2;
				el.carouselCfg.paddingY = (el.carouselCfg.size.h - (el.carouselCfg.itemHeight * el.carouselCfg.reflectionSize)) / 2;

				jQuery.iCarousel.positionItems(el);
				el.carouselCfg.speed = el.carouselCfg.increment*0.2;
				el.carouselCfg.rotationTimer = window.setInterval(
					function()
					{
						el.carouselCfg.start += el.carouselCfg.speed;
						if (el.carouselCfg.start > maxRotation)
							el.carouselCfg.start = 0;
						jQuery.iCarousel.positionItems(el);
					},
					20
				);
			}
		);
	},

	positionItems : function(el)
	{
		el.carouselCfg.items.each(
			function (nr)
			{
				angle = el.carouselCfg.start+nr*el.carouselCfg.step;
				x = el.carouselCfg.radiusX*Math.cos(angle);
				y = el.carouselCfg.radiusY*Math.sin(angle) ;
				itemZIndex = parseInt(100*(el.carouselCfg.radiusY+y)/(2*el.carouselCfg.radiusY));
				parte = (el.carouselCfg.radiusY+y)/(2*el.carouselCfg.radiusY);
				
				width = parseInt((el.carouselCfg.itemWidth - el.carouselCfg.itemMinWidth) * parte + el.carouselCfg.itemMinWidth);
				height = parseInt(width * el.carouselCfg.itemHeight / el.carouselCfg.itemWidth);
				this.style.top = Math.round(el.carouselCfg.paddingY + y - height/2) + "px";
	     		this.style.left = Math.round(el.carouselCfg.paddingX + x - width/2) + "px";
	     		this.style.width = width + "px";
	     		this.style.height = height + "px";
	     		this.style.zIndex = itemZIndex * 100;
			}
		);
	}
};
jQuery.fn.iCarousel = jQuery.iCarousel.build;