cocos2d-x中的尺寸函数繁多，官方文档对各种尺寸没有很好的描述，网上文章更加寥寥，对尺寸和位置的理解如果不到位，写代码就非常困难，需要猜测尝试，效率低下。这个文章我将研究一些我所迷惑的尺寸函数，记录在此。
先看如下代码：
bool AppDelegate::applicationDidFinishLaunching() { // initialize director CCDirector* pDirector = CCDirector::sharedDirector(); CCEGLView* pEGLView = CCEGLView::sharedOpenGLView(); pDirector->setOpenGLView(pEGLView); pDirector->getWinSize(); pDirector->getWinSizeInPixels(); pDirector->getVisibleSize(); pEGLView->getFrameSize(); pEGLView->getDesignResolutionSize(); pEGLView->getVisibleSize();在applicationDidFinishLaunching中，我们上面函数调用分别是什么意思呢，粗略的说是窗口大小呗，通过CCLOG我们把调试信息打印出来，代码变成如下：
CCSize size; size = pDirector->getWinSize(); CCLOG("width = %f height = %f, pDirector->getWinSize", size.width, size.height); size = pDirector->getWinSizeInPixels(); CCLOG("width = %f height = %f, pDirector->getWinSizeInPixels", size.width, size.height); size = pDirector->getVisibleSize(); CCLOG("width = %f height = %f, pDirector->getVisibleSize", size.width, size.height); size = pEGLView->getFrameSize(); CCLOG("width = %f height = %f, pEGLView->getFrameSize", size.width, size.height); size = pEGLView->getDesignResolutionSize(); CCLOG("width = %f height = %f, pEGLView->getDesignResolutionSize", size.width, size.height); size = pEGLView->getVisibleSize(); CCLOG("width = %f height = %f, pEGLView->getVisibleSize", size.width, size.height);打印出来调试信息如下：
从调试信息看，默认的程序，这些尺寸都是一样的，是有点头疼吧，都是一样的，你搞那么多尺寸干嘛呢.......
为了让这些值不一样，我们试着加一些代码。加一行代码如下：
bool AppDelegate::applicationDidFinishLaunching() { // initialize director CCDirector* pDirector = CCDirector::sharedDirector(); CCEGLView* pEGLView = CCEGLView::sharedOpenGLView(); pDirector->setOpenGLView(pEGLView); pDirector->setContentScaleFactor(2.0f); CCSize size; size = pDirector->getWinSize(); CCLOG("width = %f height = %f, pDirector->getWinSize", size.width, size.height); size = pDirector->getWinSizeInPixels(); CCLOG("width = %f height = %f, pDirector->getWinSizeInPixels", size.width, size.height); size = pDirector->getVisibleSize(); CCLOG("width = %f height = %f, pDirector->getVisibleSize", size.width, size.height); size = pEGLView->getFrameSize(); CCLOG("width = %f height = %f, pEGLView->getFrameSize", size.width, size.height); size = pEGLView->getDesignResolutionSize(); CCLOG("width = %f height = %f, pEGLView->getDesignResolutionSize", size.width, size.height); size = pEGLView->getVisibleSize(); CCLOG("width = %f height = %f, pEGLView->getVisibleSize", size.width, size.height); 增加了一行代码 pDirector->setContentScaleFactor(2.0f);这个函数从字面上的解释是设置缩放因子，参数为2，输出调试信息如下：
这个函数影响了pDirector->getWinSizeInPixels也就是说，让窗口的分辨率变大了，其他没变，这里的分辨率是cocos2dx自定义的这种分辨率，和屏幕分辨率没有关系
这样的话，程序运行的结果也变化了