学习Cocos2D-x之路（2）--学习第一个例子

第一个例子—HelloWorld

 

   在vs2010中启动HelloCpp,看到如下窗口

暂时不知道什么原因，图片大小与窗口并不匹配，点击右下角按钮可以退出。在Classes目录下有5个文件，在AppMaCros.h中定义了在不同平台下资源的大小。

类AppDelegate继承了CCApplication，定义了三个方法：

 

virtualbool applicationDidFinishLaunching();//响应窗口启动完成后的工作

virtualvoid applicationDidEnterBackground();//响应窗口进入后台的工作

virtualvoid applicationWillEnterForeground();//响应窗口恢复的工作。

在这个项目中，只有响应窗口启动后的工作。 下面是其中的代码

bool AppDelegate::applicationDidFinishLaunching() {

    // initializedirector

    CCDirector* pDirector =CCDirector::sharedDirector();  // 场景管理器

    CCEGLView* pEGLView =CCEGLView::sharedOpenGLView();  //创建视口 

    pDirector->setOpenGLView(pEGLView);          //设置OpenGL视口 

    // Set the designresolution

   pEGLView->setDesignResolutionSize(designResolutionSize.width,designResolutionSize.height, kResolutionNoBorder);     //设置分辨率大小 

    CCSize frameSize =pEGLView->getFrameSize();   

    vector<string> searchPath;           //资源路径 

 //在不同的平台下加载不同的资源

    if (frameSize.height> mediumResource.size.height)

    {

       searchPath.push_back(largeResource.directory); 

       pDirector->setContentScaleFactor(MIN(largeResource.size.height/designResolutionSize.height,largeResource.size.width/designResolutionSize.width));

    }

    // if the frame'sheight is larger than the height of small resource size, select mediumresource.

    else if (frameSize.height > smallResource.size.height)

    {

       searchPath.push_back(mediumResource.directory);       

        pDirector->setContentScaleFactor(MIN(mediumResource.size.height/designResolutionSize.height,mediumResource.size.width/designResolutionSize.width));

    }

    // if the frame'sheight is smaller than the height of medium resource size, select smallresource.

    else

    {

       searchPath.push_back(smallResource.directory);       pDirector->setContentScaleFactor(MIN(smallResource.size.height/designResolutionSize.height,smallResource.size.width/designResolutionSize.width));

    }

   

  //设置资源文件路径

    CCFileUtils::sharedFileUtils()->setSearchPaths(searchPath);   

    // turn ondisplay FPS

    pDirector->setDisplayStats(true);    //开启显示FPS 

    // set FPS. thedefault value is 1.0/60 if you don't call this

    pDirector->setAnimationInterval(1.0 /60);    设置帧速率 

    // create a scene. it's an autorelease object

    CCScene *pScene = HelloWorld::scene();      

    // run

    pDirector->runWithScene(pScene);      运行HelloWorld中的场景。 

    return true;

}

 

在HelloWorld类中，定义了一个场景。

CCScene*HelloWorld::scene()

{

    // 'scene' is anautorelease object

    CCScene *scene = CCScene::create();    //创建场景

    // 'layer' is anautorelease object

    HelloWorld *layer = HelloWorld::create();//创建图层

    // add layer as achild to scene

    scene->addChild(layer);                  //添加图层作为节点 

    // return thescene

    returnscene;

}

 

bool HelloWorld::init()

{

    //////////////////////////////

    // 1. super initfirst

    if (!CCLayer::init() )     //创建图层

    {

        return false;

    }   

    CCSize visibleSize =CCDirector::sharedDirector()->getVisibleSize();  //获取大小

    CCPoint origin =CCDirector::sharedDirector()->getVisibleOrigin();//获取原点

    //创建关闭按钮

    CCMenuItemImage *pCloseItem =CCMenuItemImage::create(

                                        "CloseNormal.png",

                                        "CloseSelected.png",

                                        this,

                                       menu_selector(HelloWorld::menuCloseCallback));

   

//设置按钮位置，可以看出 Cocos2d-x的坐标原点是左下角

pCloseItem->setPosition(ccp(origin.x+ visibleSize.width - pCloseItem->getContentSize().width/2 ,

                                origin.y +pCloseItem->getContentSize().height/2)); 

  //创建菜单   

    CCMenu* pMenu = CCMenu::create(pCloseItem,NULL);

    pMenu->setPosition(CCPointZero);

    this->addChild(pMenu,1); 

    //创建 HelloWorld 文本及设置位置

    CCLabelTTF* pLabel = CCLabelTTF::create("Hello World","Arial",TITLE_FONT_SIZE);   

    // position thelabel on the center of the screen

    pLabel->setPosition(ccp(origin.x +visibleSize.width/2,

                            origin.y +visibleSize.height - pLabel->getContentSize().height)); 

    // add the labelas a child to this layer

    this->addChild(pLabel,1); 

   //创建精灵

    CCSprite* pSprite = CCSprite::create("HelloWorld.png"); 

    // position thesprite on the center of the screen

   pSprite->setPosition(ccp(visibleSize.width/2 + origin.x,visibleSize.height/2 + origin.y)); 

    // add the spriteas a child to this layer

    this->addChild(pSprite,0);   

    return true;

}