cocos2dx HelloWorld 代码一撇

    本节简单对新生成的hellowrold 项目相关代码进行简单分析，具体以代码注释的方式展示给大家。代码相对简单些，在此不作过多赘述，直接上码：

int APIENTRY _tWinMain(HINSTANCE hInstance,
                       HINSTANCE hPrevInstance,
                       LPTSTR    lpCmdLine,
                       int       nCmdShow)
{
    // UNREFERENCED_PARAMETER 避免编译器关于未引用参数的警告
    UNREFERENCED_PARAMETER(hPrevInstance);
    UNREFERENCED_PARAMETER(lpCmdLine);
    
    //新建一个代理实体
    AppDelegate app;
    CCEGLView* eglView = CCEGLView::sharedOpenGLView();

    // 初始化win32下游戏窗体大小及标题等信息
    eglView->setViewName(UTEXT("这是一个测试啦"));
    eglView->setFrameSize(900, 600);

    return CCApplication::sharedApplication()->run();
}

bool AppDelegate::applicationDidFinishLaunching() 
{
    //加载配置文件信息，用于防止中文乱码及国际化
    CCConfiguration::sharedConfiguration()->loadConfigFile("config/strings.plist");

    // 初始化导演雷
    CCDirector* pDirector = CCDirector::sharedDirector();
    CCEGLView* pEGLView = CCEGLView::sharedOpenGLView();

    pDirector->setOpenGLView(pEGLView);
    
    // 设置是否限制帧频
    pDirector->setDisplayStats(true);

    // 设置刷新频率，默认为 1.0 / 60
    pDirector->setAnimationInterval(1.0 / 60);

    // 创建启动场景
    CCScene *pScene = StartScene::scene();

    // run
    pDirector->runWithScene(pScene);

    return true;
}

CCScene* StartScene::scene()
{
    //  创建一个场景
    CCScene *scene = CCScene::create();
    
    StartScene *layer = StartScene::create();

    // 设置子节点，以后你会碰到很多addChild
    scene->addChild(layer);

    // return the scene
    return scene;
}

bool StartScene::init()
{
    // 初始化layer
    if ( !CCLayer::init() )
    {
        return false;
    }
    
    CCSize visibleSize = CCDirector::sharedDirector()->getVisibleSize();
    CCPoint origin = CCDirector::sharedDirector()->getVisibleOrigin();

    // 创建程序退出按钮，注意点击事件回调函数的注册方法
    CCMenuItemImage *pCloseItem = CCMenuItemImage::create("CloseNormal.png", "CloseSelected.png",this, menu_selector(StartScene::menuCloseCallback));
    pCloseItem->setPosition(ccp(origin.x + visibleSize.width - pCloseItem->getContentSize().width/2 - 20, origin.y + visibleSize.height - pCloseItem->getContentSize().height/2 - 20));

    CCMenu* pMenu = CCMenu::create(pCloseItem, NULL);
    pMenu->setPosition(CCPointZero);
    this->addChild(pMenu, 1);
    
    // 创建一个文本标签
    CCConfiguration *conf = CCConfiguration::sharedConfiguration();
    const char *helloStr = conf->getCString("hello", "unknown");
        
    CCLabelTTF* pLabel = CCLabelTTF::create(helloStr, "Arial", 24);    
    pLabel->setPosition(ccp(origin.x + visibleSize.width/2, origin.y + visibleSize.height - pLabel->getContentSize().height));
    this->addChild(pLabel, 1);

    // 生成背景图片，此处使用sprite
    CCSprite* pSprite = CCSprite::create("HelloWorld.png");
    pSprite->setPosition(ccp(visibleSize.width/2 + origin.x, visibleSize.height/2 + origin.y));
    this->addChild(pSprite, 0);

    // this->setRotation(90.0F);
    
    return true;
}

// 点击退出按钮回调函数
void StartScene::menuCloseCallback(CCObject* pSender)
{
    CCDirector::sharedDirector()->end();

#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
    exit(0);
#endif

}