cocos2d-x 菜单项 CCMenuItem 居中缩放

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bool CCMenuItemSprite::initWithNormalSprite(CCNode* normalSprite, CCNode* selectedSprite, CCNode* disabledSprite, CCObject* target, SEL_MenuHandler selector){    CCMenuItem::initWithTarget(target, selector);     setNormalImage(normalSprite);    setSelectedImage(selectedSprite);    setDisabledImage(disabledSprite);        if (selectedSprite && normalSprite) {                               selectedSprite->setPosition(                                                                        (normalSprite->getContentSize().width-selectedSprite->getContentSize().width*0.9)/2.0f,                                                                        (normalSprite->getContentSize().height-selectedSprite->getContentSize().height*0.9)/2.0f);                selectedSprite->setScale(0.9f);    }            if(m_pNormalImage)    {        this->setContentSize(m_pNormalImage->getContentSize());    }        setCascadeColorEnabled(true);    setCascadeOpacityEnabled(true);        return true;}

0.9为缩放系数

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