//**************************************************************
// jqzoom allows you to realize a small magnifier window,close
// to the image or images on your web page easily.
//
// jqzoom version 2.1
// author doc. ing. renzi marco(www.mind-projects.it)
// first release on dec 05 2015
//**************************************************************

(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");

            $(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 = imagewidth + settings.offset;
                }
            } else {
                leftpos = imageleft - settings.xzoom - settings.offset;
                if (leftpos < 0) {
                    leftpos = imageleft + imagewidth + settings.offset;
                }
            }
            $("div.zoomdiv").css({ top: 0, 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);
                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;
}