/*
 * Image Centering
 * Copyright 2009 Drew Wilson
 * www.drewwilson.com
 *
 * Version 1.0   -   Updated: Oct. 10, 2009
 *
 * This Plug-In will center images inside of it's parent element.
 * By default it even scales each image up or down to fit inside it's parent element.
 * It will also wait to make sure each image is loaded before doing any re-sizing.
 *
 * This Image Centering jQuery plug-in is dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 */
(function ($) {
	$.fn.imgCenter = function (options) {
		
		var defaults = {
			parentSteps: 0,
			scaleToFit: true,
			centerVertical: true,
			complete: function () { },
			start: function () { },
			end:function() { }
		};
		
		var opts = $.extend(defaults, options);
		
		opts.start.call(this);
		
		var len = this.length - 1;
		
		return this.each(function (i) {
			
			var current = i;
			
			var org_image = $(this);
			
			org_image.hide();
			
			var theParent = org_image;
			
			for (var i = 0; i <= opts.parentSteps; i++) {
				
				theParent = theParent.parent();
			
			}
		
			var parWidth = parseInt(theParent.width());
		
			var parHeight = parseInt(theParent.height());
		
			var parAspect = parWidth / parHeight;

			if (org_image[0].complete) {
				
				imgMath(org_image);
			
			} else {
				
				var loadWatch = setInterval(watch,500);
			
			}
		
			function watch() {
				
				if (org_image[0].complete) {

					clearInterval(loadWatch);
					
					imgMath(org_image);
				
				}
			
			}

			function imgMath(org_image) {

				var imgWidth = parseInt(org_image.width());
				
				var imgHeight = parseInt(org_image.height());
				
				var imgAspect = imgWidth / imgHeight;

				if (parWidth != imgWidth || parHeight != imgHeight) {

					theParent.css("overflow", "hidden");

					if (opts.scaleToFit) {
						
						if (parAspect >= 1) {

							org_image.css({ "width": parWidth + "px" });
							
							imgWidth = parWidth;
							
							imgHeight = Math.round(imgWidth / imgAspect);
							
							if ((parWidth/imgAspect) < parHeight) {

								org_image.css({ "height": parHeight + "px", "width": "auto" });

								imgHeight = parHeight;
								
								imgWidth = Math.round(imgHeight*imgAspect);
							}
						
						} else {
							
							org_image.css({ "height": parHeight + "px" });
							
							imgHeight = parHeight;
							
							imgWidth = Math.round(imgHeight * imgAspect);
							
							if ((parHeight*imgAspect) < parWidth) {
								
								org_image.css({ "width": parWidth + "px", "height": "auto" });
								
								imgWidth = parWidth;
								
								imgHeight = Math.round(imgWidth/imgAspect);
							
							}

						}
						
						if (imgWidth > parWidth) {
							
							org_image.css({"margin-left":"-"+Math.round((imgWidth-parWidth)/2)+"px"});
						}
						
						if (imgHeight > parHeight && opts.centerVertical) {
							
							org_image.css({"margin-top":"-"+Math.round((imgHeight-parHeight)/2)+"px"});

						}

					} else {
						
						if (imgWidth > parWidth) {
							
							org_image.css({"margin-left":"-"+Math.round((imgWidth-parWidth)/2)+"px"});
						
						} else if (imgWidth < parWidth) {
							
							org_image.css({"margin-left":Math.round((parWidth-imgWidth)/2)+"px"});

						}
						
						if (imgHeight > parHeight && opts.centerVertical) {
							
							org_image.css({"margin-top":"-"+Math.round((imgHeight-parHeight)/2)+"px"});
						
						} else if (imgHeight < parHeight && opts.centerVertical) {
							
							org_image.css({"margin-top":Math.round((parHeight-imgHeight)/2)+"px"});

						}

					}

					opts.complete.call(this);
					
					if (current == len) {
						
						opts.end.call(this);
					
					}

				}

				org_image.show();

			}

		});

	}

})(jQuery);