Bootstrap Snippet Turn image with mouse move using HTML CSS jQuery

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<link href="//netdna.bootstrapcdn.com/bootstrap/3.1.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//netdna.bootstrapcdn.com/bootstrap/3.1.0/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<div class="container">
    <div class="row">
        <h2 class="well">turn image</h2>
        
        <div id="main"><div id="img"></div></div>
        <div id="info">
            <span></span><br/>
            <span></span>
        </div>
        <br>
        <div class="well">Turn image mouse move</div>
        
    </div>
</div>
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div#main {
    width:500px;
    height:500px;
    border:2px #000 solid; }
div#img {
    width:94px;
    height:119px;
    overflow:hidden;
    top:50%;
    left:50%;
    margin-left:-45px;
    margin-top:-60px;
    position:relative; 
    background-image:url('http://imgur.com/3UPki.png');
    background-position:0;}
div#info {
    position: absolute;
    bottom:0;
    left:0; }
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$(function() {
    var position = $("div#img").position(), 
        mouseX, mouseY, imgX, imgY, degree;
    imgX = position.left;
    imgY = position.top;
    $("#main").mousemove(function(e) {
          // degree is arctan y over x (soh,cah,toa)
        degree = Math.atan2((e.pageY - imgY),(e.pageX - imgX))*(180 / Math.PI);
        degree = (degree - 90) % 360;
          // jQuery normalizes pageX and pageY
          // transfrom from -180 to 180 ==> 0 to 360
        if (degree < 0) degree = 180 + (180 - (Math.abs(degree)));        
        rotate(degree);
        $("span:first").html("Segment: " + (9 - Math.floor(degree / 36)));
        $("span:last").html("Degree: " + Math.floor(degree));          
    }); 
        
    function rotate(degree) {
        var off = 9 - Math.floor(degree / 36);
        $("div#img").css("background-position",-off*94);
    }    
});
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"Turn image with mouse move"
Bootstrap 3.1.0 Snippet by muhittinbudak

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"Turn image with mouse move" Bootstrap 3.1.0 Snippet by muhittinbudak

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Questions / Comments:

"Turn image with mouse move"
Bootstrap 3.1.0 Snippet by muhittinbudak