operationType">Operation: </label>
        <select id="operationType">
            <option value="Xor">Xor</option>
            <option value="Union">Union</option>
            <option value="Intersect">Intersect</option>
            <option value="Difference">Difference</option>
            <option value="InverseDifference">InverseDifference</option>
            <option value="Subject">Subject</option>
            <option value="Clip">Clip</option>
		</select>
    </div>
    <canvas id="starCanvas" width="