hal/resource/web/map.tmpl

<svg id="map" width="100%" width="500" viewBox="0 0 1000 500">
    <!-- Background Map -->
    <image x="0" y="0" width="100%" height="100%" xlink:href="/img/floorplan.jpg" />

    <!-- debug stuff -->
    <rect width="100%" height="100%" style="fill-opacity:0;stroke-width:5;stroke:rgb(0,0,0)" />

    <!-- Sensor devices-->
    {{#sensors}}
    <image id="sensor{{.getId()}}" class="draggable sensor" x="0" y="0" width="46" height="46" xlink:href="/img/temperature.png" />
    {{/sensors}}

    <!-- Event devices -->
    {{#events}}
    <image  id="event{{.getId()}}" class="draggable event" x="0" y="0" width="46" height="46" xlink:href="/img/lightbulb.svg" />
    {{/events}}
</svg>


<script src="js/interact.js"></script>
<script>
    var rootMatrix;
    $(function(){
        rootMatrix = document.getElementById("map").getScreenCTM();
        interact(".draggable").draggable({
            inertia: true,
            restrict: {
                restriction: "parent",
                elementRect: { left: 0, right: 0, top: 0, bottom: 0 },
            },
            onmove: dragMoveListener,
            onend:  dragEndListener,
        });
    });

    function dragMoveListener (event) {
        var target = event.target;
        // keep the dragged position in the data-x/data-y attributes
        var x = (parseFloat(target.getAttribute('x')) || 0) + event.dx / rootMatrix.a;
        var y = (parseFloat(target.getAttribute('y')) || 0) + event.dy / rootMatrix.d;

        // update the position attributes
        target.setAttribute('x', x);
        target.setAttribute('y', y);
    }
    function dragEndListener (event) {
        // Save drag
    }
</script>

<center>
Icons downloaded from <a href="http://icons8.com">icons8.com</a>
</center>