/**
 * indicates if an object of the given class is illumated by this beam
 * 
 * @return true if an object of the given class is illuminated by this beam; else false
 */
public boolean isIlluminated(Class clss)
{
    return getOneIlluminatedObject(clss) != null;
}

/**
 * gets one illuminated object of the given class
 * 
 * @return an illuminated object of the given class, if any; else null
 */
public Actor getOneIlluminatedObject(Class clss)
{
    Actor illuminated = null;
    int rot = getRotation();
    for (Object obj : getIntersectingObjects(clss))
    {
        Actor actor = (Actor)obj;
        turnTowards(actor.getX(), actor.getY());
        int rot2 = getRotation();
        if (rot2-rot > 180) rot2 -= 360;
        if (rot2-rot < -180) rot2 += 360;
        if (Math.abs(rot2-rot) <= range/2)
        {
            illuminated = actor;
            break;
        }
    }
    setRotation(rot);
    return illuminated;
}