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Editorial Team
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Asked: 2026-05-22T17:46:48+00:00

Is there currently any data in a javascript mouse event that would allow me

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Is there currently any data in a javascript mouse event that would allow me to easily find or calculate a mouse position relative to the 3D space of a transformed element?

To illustrate visually,
At left is the div without a 3d matrix, at right is the div after 3d transformation.
o is the origin of the mouse event

                +
               /|
              / |
+-----+      +  |
|     |      |  |
|    o|  =>  | o|
|     |      |  |
+-----+      +  |
              \ |
               \|
                +

In the script below, clicking the same pixels in the div will report an event.layerX which is in the 2d transformation space of the document/screen.

I’m aware, but not thrilled about the prospect of parsing the div’s matrix3d and using that to multiply to the event position to discover this, however in the real implementation, the divs will have more complex transformations and this would need to be done on every frame for more than one object and I worry about the overhead that would bring…I certainly wouldn’t mind help with that if it’s my only option though. 

<!doctype html>  

<html lang="en">

<head>
    <meta charset='utf-8'>
    <title></title>
    <style type="text/css" media="screen">

        body {
            background-color: #FFF;
        }

        img {
            position: absolute;
        }

        #main {
            margin: 0;
            -webkit-perspective: 1800;
        }

        #card {
            position: relative;
            margin: 0 auto;
            width: 420px;
            height: 562px;
            -webkit-transform-style: preserve-3d;
            -webkit-transform-origin: center center;
        }

        #card .page {
            position: absolute;
            -webkit-transform-style: preserve-3d;
            -webkit-transform-origin: left center;
        }

        #card .page .face {
            position: absolute;
            width: 100%;
            height: 100%;
            -webkit-transform-style: flat;
        }
        #card .page .face.front {
            z-index: 1;
            -webkit-backface-visibility: hidden;
        }
        #card .page .face.back {
            -webkit-transform: rotateY(180deg) translateX(-420px);
        }

    </style>
</head>

<body>
    <div id='main'>
        <div id='card'>
            <div class='page draggable'>
                <div class='face front'>
                    <img src='front.jpg'/>
                </div>
                <div class='face back'>
                    <img src='back.jpg'/>
                </div>
            </div>
        </div>
    </div>

    <script src='http://ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js'></script>
    <script>


        function rotate() {
            $('.page').css("-webkit-transform", "rotate3d(0, -1, 0, 60deg)");
            $('.page').mousedown(function(event) {
                console.log(event.layerX);
            });
        }

        $(document).ready(function() {
            rotate();
        });

    </script>

</body>

</html>
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1 Answer

  1. Editorial Team

    It seems like you are looking for the offsetX property event.
    Maybe you’d have to create listeners to every .face in order to identify the events, because the offsetX is calculated based on the target that fires the event.
    Or maybe you want the coordinates to start from 0 on the left to width*2 on the right, then you could use the layerX and the original width of your elements:

    console.log((event.layerX<0?width-event.offsetX:width+event.offsetX));

    Using the offsetX/offsetY works no matter what transform you use (at least in the many scenarios I’ve tested)

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