作为一个CCNode,本身没有大小而言，但是AddChild之后，便有了尺寸的概念。
Cocos2d-x中对于一个节点的尺寸可以通过以下三个方法获取:
CCSprite:
getContentSize();
获取精灵的逻辑尺寸。此值不受缩放变换影响。即setScale()方法不影响此值
boundingBox().size;
获取精灵的边框尺寸。此值受到缩放变换影响。
getTexture()->getContentSizeInPixels();
获取精灵的纹理的像素尺寸。
像素点和逻辑点关系：逻辑点大小 = 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("转变后:"); 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);
输出结果:
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: 转变后:
Cocos2d: sizeByContentSize:width:114.000000 height:114.000000
Cocos2d: sizeByboundingBox:width:228.000000 height:228.000000
Cocos2d: sizeByPoints:width:114.000000 height:114.000000