    <a name = "refresh"></a>
    <strong>refresh ()</strong>
    </dt>
    <dd>
    update any dirty quads on this arc device.







</dd>
    <dt>
    <a name = "segment"></a>
    <strong>segment (ring, from, to, level)</strong>
    </dt>
    <dd>
    create an anti-aliased point to point arc
 segment/range on a specific LED ring.
 each point can be a decimal, LEDs will fade for in between values.


    <h3>Parameters:</h3>
    <ul>
        <li><span class="parameter">ring</span>
            <span class="