/*
 * jquery.zoomImg 0.1
 * By Maro(Hidemaro Mukai)  - http://www.maro-z.com/
 * Copyright (c) 2008 Hidemaro Mukai
 * Licensed under the MIT License: http://www.opensource.org/licenses/mit-license.php
 */
(function($) {
	$.extend({
		zoomImg : new function(){
			var zi = this;
			zi.defaultWinSize = {"top" : 100, "left" : 100};
			zi.constract = function(c){
				return this.each(function(){
					var ziParam = new Object;
					ziParam.stage = $("img:first", this);
					if (!c){
						ziParam.zoomMode = 0;
						ziParam.target = "#ZI_window";
					}else{
						ziParam.zoomMode = 1;
						ziParam.target = "#"+c;
					}
					ziParam.img = new Image();
					ziParam.img.src = this.href;
					$.data(this, "ziParam", ziParam);
					$(this).click(function(){
						this.blur();
						return false;
					});
					$(this).mouseover(zi.startZoom);
				});
			}
			zi.startZoom = function(e){
				zi.removeWindow();
				var obj = this;
				var ziParam = $.data(this, "ziParam");
				$("body").append('<div id="ZI_cursor"></div>');
				if (typeof document.body.style.maxHeight == "undefined"){
					$("#ZI_cursor").append('<iframe id="ZI_dummy"></iframe><div id="ZI_window"></div>');
				}else{
					$("#ZI_cursor").append('<div id="ZI_window"></div>');
				}
				if (ziParam.zoomMode == 0){
					$("#ZI_cursor").addClass("ZI_innerView");
				}else{
					$("#ZI_cursor").css({
						"width": $(ziParam.target).width()/ziParam.img.width*ziParam.stage.width(),
						"height": $(ziParam.target).height()/ziParam.img.height*ziParam.stage.height()
					});
					$("#ZI_window").addClass("ZI_outerView");
				}
				$("#ZI_dummy, #ZI_window").css({
					"width": $("#ZI_cursor").width(),
					"height": $("#ZI_cursor").height()
				});
				$(ziParam.target).append('<div id="ZI_view"></div>');
				$("#ZI_view").css({
					"width": $(ziParam.target).width(),
					"height": $(ziParam.target).height(),
					"background-image": "url("+ziParam.img.src+")",
					"background-repeat": "no-repeat"
				});
				zi.execZoom(e, obj);
				$("body").mousemove(function(e){
					zi.execZoom(e, obj);
				});
				$("#ZI_window").mouseout(function(e){
					zi.endZoom();
				});
			}
			zi.execZoom = function(e, obj){
				$("#ZI_view").html("&nbsp;");	//-- for winIE7 evaded to delay
				var ziParam = $.data(obj, "ziParam");
				var sPos = ziParam.stage.offset();
				if (e.pageX < sPos.left || e.pageX > sPos.left+ziParam.stage.width() || e.pageY < sPos.top || e.pageY > sPos.top+ziParam.stage.height()){
					zi.endZoom();
				}
				var wSize = zi.getObjSize($("#ZI_window"));
				var winX = e.pageX-(wSize.width/2);
				var winY = e.pageY-(wSize.height/2);
				if (ziParam.zoomMode == 0){
					var imgParX = (e.pageX-sPos.left)/ziParam.stage.width();
					var imgParY = (e.pageY-sPos.top)/ziParam.stage.height();
					var imgX = 0-ziParam.img.width * imgParX+($("#ZI_view").width()/2);
					var imgY = 0-ziParam.img.height * imgParY+($("#ZI_view").height()/2);

				}else if (ziParam.zoomMode == 1){
					if (winX < sPos.left){
						winX = sPos.left;
					}
					if (winX > sPos.left+ziParam.stage.width()-wSize.width){
						winX = sPos.left+ziParam.stage.width()-wSize.width;
					}
					if (winY < sPos.top){
						winY = sPos.top;
					}
					if (winY > sPos.top+ziParam.stage.height()-wSize.height){
						winY = sPos.top+ziParam.stage.height()-wSize.height;
					}
					var imgParX = (winX-sPos.left)/ziParam.stage.width();
					var imgParY = (winY-sPos.top)/ziParam.stage.height();
					var imgX = 0-Math.floor(ziParam.img.width * imgParX);
					var imgY = 0-Math.floor(ziParam.img.height * imgParY);
				}
				$("#ZI_cursor").css({"left" : winX, "top": winY});
				$("#ZI_view").css({"background-position" : imgX+"px "+imgY+"px"});
			}
			zi.endZoom = function(){
				zi.removeWindow();
				$("body").unbind('mousemove');
			}
			zi.removeWindow = function(){
				$("#ZI_cursor").remove();
				$("#ZI_view").remove();
			}
			zi.getObjSize = function(obj){
				var size = new Object();
				size.width = obj.width();
				size.width += parseInt(obj.css("border-left-width"));
				size.width += parseInt(obj.css("border-right-width"));
				size.height = obj.height();
				size.height += parseInt(obj.css("border-top-width"));
				size.height += parseInt(obj.css("border-bottom-width"));
				return size;
			}
		}
	});
	$.fn.extend({
		zoomImg: $.zoomImg.constract
	});
})(jQuery);