/**
 * 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.
 *
 */
/**
 * Created a 3D Carousel from a list of images, with reflections and animated by mouse position
 * 
 * @example window.onload = 
 *			function()
 *			{
 *				$('#carousel').Carousel(
 *					{
 *						itemWidth: 110,
 *						itemHeight: 62,
 *						itemMinWidth: 50,
 *						items: 'a',
 *						reflections: .5,
 *						rotationSpeed: 1.8
 *					}
 *				);
 *			}
 * HTML
 *			<div id="carousel">
 *				<a href="" title=""><img src="" width="100%" /></a>
 *				<a href="" title=""><img src="" width="100%" /></a>
 *				<a href="" title=""><img src="" width="100%" /></a>
 *				<a href="" title=""><img src="" width="100%" /></a>
 *				<a href="" title=""><img src="" width="100%" /></a>
 *			</div>
 * CSS
 *			#carousel
 *			{
 *				width: 700px;
 *				height: 150px;
 *				background-color: #111;
 *				position: absolute;
 *				top: 200px;
 *				left: 100px;
 *			}
 *			#carousel a
 *			{
 *				position: absolute;
 *				width: 110px;
 *			}
 *
 * @desc Creates a 3D carousel from all images inside div tag with id 'carousel'
 *
 *
 * @name 3D Carousel
 * @description Created a 3D Carousel from a list of images, with reflections and animated by mouse position
 * @param Hash hash A hash of parameters
 * @option String items items selection
 * @option Integer itemWidth the max width for each item
 * @option Integer itemHeight the max height for each item
 * @option Integer itemMinWidth the minimum width for each item, the height is automaticaly calculated to keep proportions
 * @option Float rotationSpeed the speed for rotation animation
 * @option Float reflectionSize the reflection size a fraction from items' height
 *
 * @type jQuery
 * @cat Plugins/Interface
 * @author Stefan Petre
 */
jQuery.iCarousel = {

  build: function(options) {
    return this.each(
			function() {

			  var el = this;
			  var increment = 2 * Math.PI / 360; //0; //bib terug naar originele instelling door wens van olaf.
			  var maxRotation = 2 * Math.PI;  //0; // mjb op nul gezet, geen autostart rotatie 2*Math.PI; // bib terug naar originele instelling door wens van olaf.
			  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) / 3;
			  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 / 2 - el.carouselCfg.itemHeight * el.carouselCfg.reflectionSize;
			  var reflexions = document.createElement('div');
			  jQuery(reflexions)
					.css(
						{
						  position: 'absolute',
						  zIndex: 1,
						  top: 0,
						  left: 0
						}
					);
			  jQuery(el).append(reflexions);
			  el.carouselCfg.items
					.each(
						function(nr) {
						  image = jQuery('img', this).get(0);
						  height = parseInt(el.carouselCfg.itemHeight * el.carouselCfg.reflectionSize);
						  if (jQuery.browser.msie) {
						    canvas = document.createElement('img');
						    jQuery(canvas).css('position', 'absolute');
						    canvas.src = image.src;
						    canvas.style.filter = 'flipv progid:DXImageTransform.Microsoft.Alpha(opacity=60, style=1, finishOpacity=0, startx=0, starty=0, finishx=0)';

						  } else {
						    canvas = document.createElement('canvas');
						    if (canvas.getContext) {
						      context = canvas.getContext("2d");
						      canvas.style.position = 'absolute';
						      canvas.style.height = height + 'px';
						      canvas.style.width = el.carouselCfg.itemWidth + 'px';
						      canvas.height = height;
						      canvas.width = el.carouselCfg.itemWidth;
						      context.save();

						      context.translate(0, height);
						      context.scale(1, -1);

						      /*context.drawImage(
						      image, 
						      0, 
						      0, 
						      el.carouselCfg.itemWidth, 
						      height
						      );*/

						      context.restore();

						      context.globalCompositeOperation = "destination-out";
						      var gradient = context.createLinearGradient(
										0,
										0,
										0,
										height
									);

						      gradient.addColorStop(1, "rgba(255, 255, 255, 1)");
						      gradient.addColorStop(0, "rgba(255, 255, 255, 0.6)");

						      context.fillStyle = gradient;
						      if (navigator.appVersion.indexOf('WebKit') != -1) {
						        context.fill();
						      } else {
						        context.fillRect(
											0,
											0,
											el.carouselCfg.itemWidth,
											height
										);
						      }
						    }
						  }

						  el.carouselCfg.reflections[nr] = canvas;
						  jQuery(reflexions).append(canvas);
						}
					)
					.bind(
						'mouseover',
						function(e) {
						  el.carouselCfg.protectRotation = true;
						  //el.carouselCfg.speed = el.carouselCfg.increment*0.1 * el.carouselCfg.speed / Math.abs(el.carouselCfg.speed);
						  el.carouselCfg.speed = -0.0000000000009
						  return false;
						}
					)
					.bind(
						'mouseout',
						function(e) {
						  el.carouselCfg.protectRotation = false;
						  return false;

						}

					);
			  jQuery.iCarousel.positionItems(el);
			  el.carouselCfg.speed = el.carouselCfg.increment * 0.15;
			  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
				);
			  jQuery(el)
					.bind(
						'mouseout',
						function() {
						  //el.carouselCfg.speed = el.carouselCfg.increment*0.2 * el.carouselCfg.speed / Math.abs(el.carouselCfg.speed);

						  // mjb, op laag getal zetten, interval blijft actief, maar het lijkt niet te scrollen.
						  // weer start als er in het zwart bewogen wordt.

						  el.carouselCfg.speed = -0.0000000000009 //-0.003490658503988659;
						  // mjb, als ik hier d einterval uitzet krijg ik hem niet meer aan
						  //clearInterval(el.carouselCfg.rotationTimer)
						}
					)
					.bind(
						'mousemove',
						function(e) {
						  if (el.carouselCfg.protectRotation == false) {
						    pointer = jQuery.iUtil.getPointer(e);
						    mousex = el.carouselCfg.size.w - pointer.x + el.carouselCfg.position.x;
						    el.carouselCfg.speed = el.carouselCfg.rotationSpeed * el.carouselCfg.increment * (el.carouselCfg.size.w / 2 - mousex) / (el.carouselCfg.size.w / 2);
						  }
						}
					);
			}
		);
  },

  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 = el.carouselCfg.paddingY + y - height / 2 + "px";
			  this.style.left = el.carouselCfg.paddingX + x - width / 2 + "px";
			  this.style.width = width + "px";
			  this.style.height = height + "px";
			  this.style.zIndex = itemZIndex;
			  el.carouselCfg.reflections[nr].style.top = parseInt(el.carouselCfg.paddingY + y + height - 1 - height / 2) + "px";
			  el.carouselCfg.reflections[nr].style.left = parseInt(el.carouselCfg.paddingX + x - width / 2) + "px";
			  el.carouselCfg.reflections[nr].style.width = width + "px";
			  el.carouselCfg.reflections[nr].style.height = parseInt(height * el.carouselCfg.reflectionSize) + "px";
			}
		);
  }
};
jQuery.fn.Carousel = jQuery.iCarousel.build;