從上一篇《Cocos2d-x 2.0 在Windows平臺下的使用》已經初步瞭解了Cocos2d-x的安裝、編譯，也已經可以運行HelloWorld示例了，運行HelloWorld至少所需的文件，包括：素材、動態庫，我們把"...\Release.win32"裏的"HelloWorld.exe"單獨拷貝到一個新文件夾，至少所需的文件如下圖所示：
打開cocos2d-win32.vc2008.sln，展開"HelloWorld"工程，工程結構如下所示：
對應"...\HelloWorld"文件夾的結構如下所示：
可知"Classes"放置遊戲開發邏輯相關、平臺無關的代碼，"Resources"放置圖片、聲音、配置等資源，"win32"等放置平臺相關的代碼。
瞭解如何運行，在win32下就從main()函數開始，打開"main.cpp"，代碼如下所示：
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#include "main.h"
#include "../Classes/AppDelegate.h" #include "CCEGLView.h" USING_NS_CC; int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow) { UNREFERENCED_PARAMETER(hPrevInstance); UNREFERENCED_PARAMETER(lpCmdLine); // create the application instance AppDelegate app; CCEGLView& eglView = CCEGLView::sharedOpenGLView(); eglView.setViewName("Hello World"); eglView.setFrameSize(480, 320); // set the design resolution screen size, if you want to use Design Resoulution scaled to current screen, please uncomment next line. // eglView.setDesignResolutionSize(480, 320); return CCApplication::sharedApplication().run(); } |
其中AppDelegate是最主要的類，代理運行着整個應用程序，它的體系如下：
簡化流程如下所示：
而CCEGLView是整個程序窗口類，遊戲的顯示、表現等等都在這上面進行，跟AppDelegate合起來的流程如下：
在CCApplication::run()中調用了applicationDidFinishLaunching()函數，代碼如下：
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bool AppDelegate::applicationDidFinishLaunching() {
// initialize director CCDirector *pDirector = CCDirector::sharedDirector(); pDirector->setOpenGLView(&CCEGLView::sharedOpenGLView()); // enable High Resource Mode(2x, such as iphone4) and maintains low resource on other devices. // pDirector->enableRetinaDisplay(true); // turn on display FPS pDirector->setDisplayStats(true); // set FPS. the default value is 1.0/60 if you don't call this pDirector->setAnimationInterval(1.0 / 60); // create a scene. it's an autorelease object CCScene *pScene = HelloWorld::scene(); // run pDirector->runWithScene(pScene); return true; } |
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CCScene* HelloWorld::scene()
{ // 'scene' is an autorelease object CCScene *scene = CCScene::create(); // 'layer' is an autorelease object HelloWorld *layer = HelloWorld::create(); // add layer as a child to scene scene->addChild(layer); // return the scene return scene; } |
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bool HelloWorld::init()
{ ////////////////////////////// // 1. super init first if ( !CCLayer::init() ) { return false; } ///////////////////////////// // 2. add a menu item with "X" image, which is clicked to quit the program // you may modify it. // add a "close" icon to exit the progress. it's an autorelease object CCMenuItemImage *pCloseItem = CCMenuItemImage::create( "CloseNormal.png", "CloseSelected.png", this, menu_selector(HelloWorld::menuCloseCallback) ); pCloseItem->setPosition( ccp(CCDirector::sharedDirector()->getWinSize().width - 20, 20) ); // create menu, it's an autorelease object CCMenu* pMenu = CCMenu::create(pCloseItem, NULL); pMenu->setPosition( CCPointZero ); this->addChild(pMenu, 1); ///////////////////////////// // 3. add your codes below... // add a label shows "Hello World" // create and initialize a label CCLabelTTF* pLabel = CCLabelTTF::create("Hello World", "Arial", 24); // ask director the window size CCSize size = CCDirector::sharedDirector()->getWinSize(); // position the label on the center of the screen pLabel->setPosition( ccp(size.width / 2, size.height - 50) ); // add the label as a child to this layer this->addChild(pLabel, 1); // add "HelloWorld" splash screen" CCSprite* pSprite = CCSprite::create("HelloWorld.png"); // position the sprite on the center of the screen pSprite->setPosition( ccp(size.width/2, size.height/2) ); // add the sprite as a child to this layer this->addChild(pSprite, 0); return true; } |
在這個函數裏，創建了各個子元素，創建完之後，用addChild加入到主層上，上面的註釋清晰的描述了步驟。
參考閱讀：
1.cocos2d-x初探學習筆記（1）--HelloWorld http://blog.csdn.net/bill_man/article/details/7202458
2.cocos2d-x之HelloWorld範例分析(一) http://www.lugw.net/?p=80005
