1 游戏逻辑架构，Cocos2d-x游戏项目创建，HelloWorld项目创建，HelloWorld程序分析，（CCApplicationProtocol，CCApplication，AppDeleg



1
游戏逻辑架构

具体介绍

A 一个导演同一时间仅仅能执行一个场景，场景其中，能够同一时候载入多个层，一个层能够可载多个精灵。层中亦能够加层。

B  场景切换 sceneàaddChild(layer); layeràaddChild(sprite);

2
项目创建命令：

A 进入tools下的project-creat E:\Installed\cocos2d-x-2.2.3\tools\project-creator>

B python create_project.py -project MyCocos2dx -package com.toto.mycocos01 -language cpp

C 命令解释： -project MyCocos2dx工程名 -package com.toto.mycocos01 包名 -language cpp 开发语言可选项目有javascript lua

D 创建后的项目文件夹:

3
 简单介绍

1 查看cocos2dx游戏的版本号信息。 创建了一个cocos2dx项目之后，打开项目之后，会有例如以下项目结构 展开libcocos2d,找到cocos2d.cpp，双击打开此cpp文件，内容例如以下： #include "cocos2d.h" NS_CC_BEGIN const char* cocos2dVersion() { return "2.2.3"; } NS_CC_END 截图例如以下： 分析： A  由上能够看出项目的版本是：2.2.3 B  依赖的头文件 “cocos2d.h”

2 查看程序入口

程序入口是：main.cpp

#include "main.h" #include "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;                             //Delegate:表示 委派…为代表 n:代表 CCEGLView* eglView = CCEGLView::sharedOpenGLView(); eglView->setViewName("MyCocos2dx");                 //程序的标题 eglView->setFrameSize(480, 320);                    //程序的尺寸 return CCApplication::sharedApplication()->run();   //关于shared的通常是单例模式 }

进入run函数, run的代码结构例如以下（选中run(),再按F12进行查看）：

int CCApplication::run() { PVRFrameEnableControlWindow(false); // Main message loop: MSG msg; LARGE_INTEGER nFreq; LARGE_INTEGER nLast; LARGE_INTEGER nNow; QueryPerformanceFrequency(&nFreq); QueryPerformanceCounter(&nLast); // Initialize instance and cocos2d. if (!applicationDidFinishLaunching()) { return 0; } CCEGLView* pMainWnd = CCEGLView::sharedOpenGLView(); pMainWnd->centerWindow(); ShowWindow(pMainWnd->getHWnd(), SW_SHOW); while (1) { if (! PeekMessage(&msg, NULL, 0, 0, PM_REMOVE)) { // Get current time tick. QueryPerformanceCounter(&nNow); // If it's the time to draw next frame, draw it, else sleep a while. if (nNow.QuadPart - nLast.QuadPart > m_nAnimationInterval.QuadPart) { nLast.QuadPart = nNow.QuadPart; CCDirector::sharedDirector()->mainLoop(); } else { Sleep(0); } continue; } if (WM_QUIT == msg.message) { // Quit message loop. break; } // Deal with windows message. if (! m_hAccelTable || ! TranslateAccelerator(msg.hwnd, m_hAccelTable, &msg)) { TranslateMessage(&msg); DispatchMessage(&msg); } } return (int) msg.wParam; }

程序的入口：applicationDidFinishLaunching()

AppDelegate.cpp bool AppDelegate::applicationDidFinishLaunching() { // initialize director CCDirector* pDirector = CCDirector::sharedDirector(); CCEGLView* pEGLView = CCEGLView::sharedOpenGLView(); pDirector->setOpenGLView(pEGLView); // 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);    //设置帧率 // create a scene. it's an autorelease object CCScene *pScene = HelloWorld::scene(); // run pDirector->runWithScene(pScene); return true; } 截图：

HelloWorldScene.h   HelloWorld类的本质是一个层（CCLayer）：

#ifndef __HELLOWORLD_SCENE_H__ #define __HELLOWORLD_SCENE_H__ #include "cocos2d.h" class HelloWorld : public cocos2d::CCLayer { public: // Here's a difference. Method 'init' in cocos2d-x returns bool, instead of returning 'id' in cocos2d-iphone virtual bool init(); // there's no 'id' in cpp, so we recommend returning the class instance pointer static cocos2d::CCScene* scene(); // a selector callback void menuCloseCallback(CCObject* pSender); // implement the "static node()" method manually CREATE_FUNC(HelloWorld); }; #endif // __HELLOWORLD_SCENE_H__

HelloWorldScene.cpp

#include "HelloWorldScene.h" USING_NS_CC; 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; } // on "init" you need to initialize your instance bool HelloWorld::init() { ////////////////////////////// // 1. super init first if ( !CCLayer::init() ) { return false; } CCSize visibleSize = CCDirector::sharedDirector()->getVisibleSize(); CCPoint origin = CCDirector::sharedDirector()->getVisibleOrigin(); ///////////////////////////// // 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(origin.x + visibleSize.width - pCloseItem->getContentSize().width/2 , origin.y + pCloseItem->getContentSize().height/2)); // 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); // position the label on the center of the screen pLabel->setPosition(ccp(origin.x + visibleSize.width/2, origin.y + visibleSize.height - pLabel->getContentSize().height)); // 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(visibleSize.width/2 + origin.x, visibleSize.height/2 + origin.y)); // add the sprite as a child to this layer this->addChild(pSprite, 0); return true; } void HelloWorld::menuCloseCallback(CCObject* pSender) { #if (CC_TARGET_PLATFORM == CC_PLATFORM_WINRT) || (CC_TARGET_PLATFORM == CC_PLATFORM_WP8) CCMessageBox("You pressed the close button. Windows Store Apps do not implement a close button.","Alert"); #else CCDirector::sharedDirector()->end(); #if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS) exit(0); #endif #endif }

总结： 1、对于cocos真正的初始化是在init()方法中 2、CCScene中的  autorelease()完毕了析构的过程 3、CCPointZero 表示的位置是CCPointMake(0,0);

4
（CCApplicationProtocol，CCApplication，AppDelegate）三个类的类关系介绍：

抽出代码详细实现：

长处：屏蔽了平台的差异性，实现跨平台

1   CCApplicationProtocol 定义了接口 #ifndef __CC_APPLICATION_PROTOCOL_H__ #define __CC_APPLICATION_PROTOCOL_H__ NS_CC_BEGIN enum TargetPlatform { kTargetWindows, kTargetLinux, kTargetMacOS, kTargetAndroid, kTargetIphone, kTargetIpad, kTargetBlackBerry, kTargetNaCl, kTargetEmscripten, kTargetTizen, kTargetWinRT, kTargetWP8 }; /** * @addtogroup platform * @{ * @js NA * @lua NA */ class CC_DLL CCApplicationProtocol { public: virtual ~CCApplicationProtocol() {} /** @brief    Implement CCDirector and CCScene init code here. @return true    Initialize success, app continue. @return false   Initialize failed, app terminate. */ virtual bool applicationDidFinishLaunching() = 0;     //这个类是一个纯虚函数 /** @brief  The function be called when the application enter background @param  the pointer of the application */ virtual void applicationDidEnterBackground() = 0; /** @brief  The function be called when the application enter foreground @param  the pointer of the application */ virtual void applicationWillEnterForeground() = 0; /** @brief    Callback by CCDirector for limit FPS. @interval       The time, expressed in seconds, between current frame and next. */ virtual void setAnimationInterval(double interval) = 0; /** @brief Get current language config @return Current language config */ virtual ccLanguageType getCurrentLanguage() = 0; /** @brief Get target platform */ virtual TargetPlatform getTargetPlatform() = 0; }; // end of platform group /// @} NS_CC_END #endif    // __CC_APPLICATION_PROTOCOL_H__

2  CCApplication 各个平台不同的逻辑

3  AppDelegate 私有继承了CCApplication 仅实现CCApplicationProtocol 里的接口