/*
*copyright by 动力无限 v4.0  www.btoe.cn
*邮箱 btoe@btoe.cn
*合作电话 400-0599-360
*版权所有违者必究
/*-----------------------------------------------------------*/

(function($){

    $.fn.jqueryzoom = function(options){

    var settings = {
        xzoom: 200,    //zoomed width default width
        yzoom: 200,    //zoomed div default width
        offset: 10,    //zoomed div default offset
        position: "right" ,//zoomed div default position,offset position is to the right of the image
        lens:1, //zooming lens over the image,by default is 1;
        preload: 1

      };

      if(options) {
        $.extend(settings, options);
      }

        var noalt='';

        $(this).hover(function(){
                
        var imageleft = $(this).offset().left;                
        var imagetop = $(this).offset().top;

               
        var imagewidth = $(this).children('img').get(0).offsetwidth;
        var imageheight = $(this).children('img').get(0).offsetheight;


            noalt= $(this).children("img").attr("alt");

        var bigimage = $(this).children("img").attr("jqimg");
        
        if(bigimage=="")
            return false;

            $(this).children("img").attr("alt",'');

        if($("div.zoomdiv").get().length == 0){

        $(this).after("<div class='zoomdiv'><img class='bigimg' src='"+bigimage+"'/></div>");


        $(this).append("<div class='jqzoompup'>&nbsp;</div>");

        }


        if(settings.position == "right"){

            if(imageleft + imagewidth + settings.offset + settings.xzoom > screen.width){

            leftpos = imageleft  - settings.offset - settings.xzoom;

            }else{

        leftpos = imageleft + imagewidth + settings.offset;
            }
        }else{
        leftpos = imageleft - settings.xzoom - settings.offset;
        if(leftpos < 0){

            leftpos = imageleft + imagewidth  + settings.offset;

        }

        }

        $("div.zoomdiv").css({ top: imagetop,left: leftpos });

        $("div.zoomdiv").width(settings.xzoom);

        $("div.zoomdiv").height(settings.yzoom);

            $("div.zoomdiv").show();

            if(!settings.lens){
              $(this).css('cursor','crosshair');
      }




           $(document.body).mousemove(function(e){



                   mouse = new mouseevent(e);

                   /*$("div.jqzoompup").hide();*/


            var bigwidth = $(".bigimg").get(0).offsetwidth;

            var bigheight = $(".bigimg").get(0).offsetheight;

            var scaley ='x';

            var scalex= 'y';


            if(isnan(scalex)|isnan(scaley)){

            var scalex = (bigwidth/imagewidth);

            var scaley = (bigheight/imageheight);




            $("div.jqzoompup").width((settings.xzoom)/scalex );

            $("div.jqzoompup").height((settings.yzoom)/scaley);

                    if(settings.lens){
                    $("div.jqzoompup").css('visibility','visible');
          }

           }

                    

                    xpos = mouse.x - $("div.jqzoompup").width()/2 - imageleft;

                    ypos = mouse.y - $("div.jqzoompup").height()/2 - imagetop ;

                    if(settings.lens){

                    xpos = (mouse.x - $("div.jqzoompup").width()/2 < imageleft ) ? 0 : (mouse.x + $("div.jqzoompup").width()/2 > imagewidth + imageleft ) ?  (imagewidth -$("div.jqzoompup").width() -2)  : xpos;

          ypos = (mouse.y - $("div.jqzoompup").height()/2 < imagetop ) ? 0 : (mouse.y + $("div.jqzoompup").height()/2  > imageheight + imagetop ) ?  (imageheight - $("div.jqzoompup").height() -2 ) : ypos;

                    }


                    if(settings.lens){

                    $("div.jqzoompup").css({ top: ypos,left: xpos });

                    }



          scrolly = ypos;

          $("div.zoomdiv").get(0).scrolltop = scrolly * scaley;

          scrollx = xpos;

          $("div.zoomdiv").get(0).scrollleft = (scrollx) * scalex ;


            });
        },function(){

               $(this).children("img").attr("alt",noalt);
           $(document.body).unbind("mousemove");
           if(settings.lens){
           $("div.jqzoompup").remove();
           }
           $("div.zoomdiv").remove();

        });

        count = 0;

    if(settings.preload){

    $('body').append("<div style='display:none;' class='jqpreload"+count+"'>sdsdssdsd</div>");

    $(this).each(function(){

        var imagetopreload= $(this).children("img").attr("jqimg");

        var content = jquery('div.jqpreload'+count+'').html();

        jquery('div.jqpreload'+count+'').html(content+'<img src=\"'+imagetopreload+'\">');

    });

    }

    }

})(jquery);

function mouseevent(e) {
this.x = e.pagex;
this.y = e.pagey;


}