-(void) update: (ccTime) t
{
    // XXX: shall I add % 360
    if (_angleX == _angleY)
        [_target setRotation:_startAngleX + _angleX * t];
    else
    {
        [_target setRotationX:(_startAngleX + _angleX * t)];
        [_target setRotationY:(_startAngleY + _angleY * t)];
    }
}