cocos2d-x 3.0的入门程序：helloworld

看过了这么多不同方向的应用，发现很多程序入门都是helloworld
helloworld是所有程序员的绝对初恋

先看一下程序的运行结果吧

然后就是他的工程代码

工程的目录有两个

 

    Classes:程序中的类

          AppDelegate.h/cpp：Cocos2d-x程序框架
          AppMacros.h:所用到的宏，主要是设置分辩率及对应的资源目录         
          HelloWorldScene.h/cpp:场景显示层

    win32:WIN32程序所涉及的主函数

          main.cpp:winMain主函数

 

WinMain函数：

 

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#include "main.h" #include "AppDelegate.h" #include "cocos2d.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;     //运行创建程序     return Application::getInstance()->run(); }

 

      一切都被封装到程序类AppDelegate中，这是一个基于Cocos2d-x的cocos2d::Application类的派生类。

它将程序框架封装为一个类，提供了统一的多平台上基本程序框架的实现。

 

AppDelegate.cpp:

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#include "AppDelegate.h" #include "HelloWorldScene.h"   USING_NS_CC;   AppDelegate::AppDelegate() {   }   AppDelegate::~AppDelegate() { }   bool AppDelegate::applicationDidFinishLaunching() {     // initialize director创建导演     auto director = Director::getInstance();     //创建opengl窗口     auto glview = director->getOpenGLView();     if(!glview) {         glview = GLView::create("My Game");         director->setOpenGLView(glview);     }       // turn on display FPS 打开FPS     director->setDisplayStats(true);       // set FPS. the default value is 1.0/60 if you don't call thi 1秒60帧     director->setAnimationInterval(1.0 / 60);       // create a scene. it's an autorelease object创建场景和层     auto scene = HelloWorld::createScene();       // run启动场景     director->runWithScene(scene);       return true; } //当收到电话，游戏转入后台服务 // This function will be called when the app is inactive. When comes a phone call,it's be invoked too void AppDelegate::applicationDidEnterBackground() {     Director::getInstance()->stopAnimation();       // if you use SimpleAudioEngine, it must be pause     // SimpleAudioEngine::getInstance()->pauseBackgroundMusic(); } //当电话完成，选择恢复游戏时，响应这句 // this function will be called when the app is active again void AppDelegate::applicationWillEnterForeground() {     Director::getInstance()->startAnimation();       // if you use SimpleAudioEngine, it must resume here     // SimpleAudioEngine::getInstance()->resumeBackgroundMusic(); }

　　

 

下面我们来看一下HelloWorld场景,它是一个基于cocos2d::Layer的派生类。cocos2d::Layer是什么？在这里，我想打个比方来建立一些基本的认知，比方说我们生活在地球上，地球属于宇宙内的一部分。从Cocos2d-x的框架体系来看，我们是Sprite精灵，地球是Layer，而宇宙是Scene。

 

        一个程序要想表现出精彩的世界，要先建立一个宇宙Scene，然后增加地球，月球，太阳等Layer，然后在这些Layer上增加相应的物体。而我们站在地球上，地球运动，我们也会跟着一起运动。

 

  OK，现在我们来看一下如何创建Scene和Layer:

 

HelloWorldScene.h:

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#include "HelloWorldScene.h"   USING_NS_CC;   Scene* HelloWorld::createScene() {     // 'scene' is an autorelease object     auto scene = Scene::create();           // 'layer' is an autorelease object     auto 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 ( !Layer::init() )     {         return false;     }     //得到屏幕的大小，得到原点     Size visibleSize = Director::getInstance()->getVisibleSize();     Vec2 origin = Director::getInstance()->getVisibleOrigin();       /////////////////////////////     // 2. add a menu item with "X" image, which is clicked to quit the program     //    you may modify it.     //   // 创建一个菜单项，它由两张图片来表现普通状态和按下状态，设置按下时调用menuCloseCallback函数响应关闭      // add a "close" icon to exit the progress. it's an autorelease object     auto closeItem = MenuItemImage::create(                                            "CloseNormal.png",                                            "CloseSelected.png",                                            CC_CALLBACK_1(HelloWorld::menuCloseCallback, this));     //指定菜单位置,菜单项     closeItem->setPosition(Vec2(origin.x + visibleSize.width - closeItem->getContentSize().width/2 ,                                 origin.y + closeItem->getContentSize().height/2));       // create menu, it's an autorelease object菜单项放到菜单里     auto menu = Menu::create(closeItem, NULL);     menu->setPosition(Vec2::ZERO);     this->addChild(menu, 1);//放到当前的层       /////////////////////////////     // 3. add your codes below...       // add a label shows "Hello World"     // create and initialize a label     //创建标签     auto label = LabelTTF::create("Hello World", "Arial", 24);           // position the label on the center of the screen标签位置     label->setPosition(Vec2(origin.x + visibleSize.width/2,                             origin.y + visibleSize.height - label->getContentSize().height));       // add the label as a child to this layer将标签放到层中     this->addChild(label, 1);       // add "HelloWorld" splash screen"创建图片精灵     auto sprite = Sprite::create("HelloWorld.png");       // position the sprite on the center of the screen精灵位置     sprite->setPosition(Vec2(visibleSize.width/2 + origin.x, visibleSize.height/2 + origin.y));       // add the sprite as a child to this layer将精灵放到层中     this->addChild(sprite, 0);           return true; }   //点close菜单项的时候来回调的 void HelloWorld::menuCloseCallback(Ref* pSender) {     ////如果是WP8平台，弹出消息框提示一下。  #if (CC_TARGET_PLATFORM == CC_PLATFORM_WP8) || (CC_TARGET_PLATFORM == CC_PLATFORM_WINRT)     MessageBox("You pressed the close button. Windows Store Apps do not implement a close button.","Alert");     return; #endif     //终止程序。     Director::getInstance()->end();     //如果是ios平台 #if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)     exit(0); #endif }

　　Layer中增加了精灵，按钮，文字等表现物，有了这些表现物，一个Layer才有价值。

参考：http://blog.csdn.net/honghaier/article/details/24518863（谢谢）