cocos2d-x 3.0的入门程序：helloworld

转自：http://www.cnblogs.com/zsboy/p/3925098.html

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

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：

#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:

#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 toovoid 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 againvoid 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:

#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 instancebool 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）