[Cocos2d-x]節點的尺寸大小

作為一個CCNode,本身沒有大小而言，但是AddChild之后，便有了尺寸的概念。

 

Cocos2d-x中對於一個節點的尺寸可以通過以下三個方法獲取:

CCSprite:

 

getContentSize();

獲取精靈的邏輯尺寸。此值不受縮放變換影響。即setScale()方法不影響此值

 

boundingBox().size;

獲取精靈的邊框尺寸。此值受到縮放變換影響。

 

getTexture()->getContentSizeInPixels();

獲取精靈的紋理的像素尺寸。

 

像素點和邏輯點關系：邏輯點大小 = 像素大小/contentScale

 

Ex:

    CCSize sizeByContentSize = pBackground->getContentSize();
    CCSize sizeByboundingBox = pBackground->boundingBox().size;
    CCSize sizeByPoints = pBackground->getTexture()->getContentSizeInPixels();
    
    CCLOG("sizeByContentSize:width:%f height:%f",sizeByContentSize.width,sizeByContentSize.height);
    CCLOG("sizeByboundingBox:width:%f height:%f",sizeByboundingBox.width,sizeByboundingBox.height);
    CCLOG("sizeByPoints:width:%f height:%f",sizeByPoints.width,sizeByPoints.height);

    pBackground->setScale(2);
    CCLOG("轉變后:");
    
    sizeByContentSize = pBackground->getContentSize();
    sizeByboundingBox = pBackground->boundingBox().size;
    sizeByPoints =pBackground->getTexture()->getContentSizeInPixels();
    
    CCLOG("sizeByContentSize:width:%f height:%f",sizeByContentSize.width,sizeByContentSize.height);
    CCLOG("sizeByboundingBox:width:%f height:%f",sizeByboundingBox.width,sizeByboundingBox.height);
    CCLOG("sizeByPoints:width:%f height:%f",sizeByPoints.width,sizeByPoints.height);

輸出結果:

Cocos2d: sizeByContentSize:width:114.000000 height:114.000000

Cocos2d: sizeByboundingBox:width:114.000000 height:114.000000

Cocos2d: sizeByPoints:width:114.000000 height:114.000000

Cocos2d: 轉變后:

Cocos2d: sizeByContentSize:width:114.000000 height:114.000000

Cocos2d: sizeByboundingBox:width:228.000000 height:228.000000

Cocos2d: sizeByPoints:width:114.000000 height:114.000000