cocos2dx 云彩特效

cocos2dx 云彩特效，就是一张云彩Png 图片从屏幕左边移动到右边，再从左边移动到右边

yuncai = static_cast<ImageView*>(Helper::seekWidgetByName(la, "yuncai"));
    Sequence* seq = Sequence::create(MoveTo::create(, Vec2(s.width, yuncai->getPosition().y)),
        Place::create(Vec2(-yuncai->getContentSize().width, yuncai->getPosition().y)),
        nullptr);
    yuncai->runAction(RepeatForever::create(seq));