<craft name="electronring">
    <info>
        <title>Bohr Model Electron Ring</title>
    </info>

    <style>
        .electronRing{
            color: blue;
        }
    </style>
    <craft name="electron" module="N1GZz"></craft>

    <param name="outer" type="int" default="100"/>
    <param name="electron" type="int" default="2"/>

    <g l="select(#outerRing) cut(#innerRing)">
        <cylinder id="outerRing" class ="electronRing" radius="{{outer}}" t="scale(1 1 0.5) center()"></cylinder>
        <cylinder id="innerRing" radius="{{outer-3}}" t="scale(1 1 0.5) center()"></cylinder>
    </g>

    <g>
        <repeat n ="{{electron}}">
            <electron></electron>
        </repeat>
        <script>
            var numElectron = $params.electron;
            var radianSeparation = 2*Math.PI/numElectron;
            for(var i=0; i<numElectron; i++)
            {
                var electronX = ($params.outer-2)*Math.sin(i*radianSeparation);
                var electronY = ($params.outer-2)*Math.cos(i*radianSeparation);
                this.children[i].center(electronX,electronY,0);
            }
        </script>
    </g>
</craft>