HelloWorld场景就是游戏中的主菜单场景。HelloWorld.h文件代码如下：

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1. #define __HELLOWORLD_SCENE_H__  
2.   
3.   
4. #include "cocos2d.h"  
5. #include "SimpleAudioEngine.h"                                          ①  
6. #include "SettingScene.h"  
7.   
8.   
9. class HelloWorld : public cocos2d::Layer  
10. {  
11. public:  
12.     static cocos2d::Scene* createScene();  
13.   
14.   
15.     virtual bool init();                                                    ②  
16.     virtual void onEnter();  
17.     virtual void onEnterTransitionDidFinish();  
18.     virtual void onExit();  
19.     virtual void onExitTransitionDidStart();  
20.     virtual void cleanup();                                                 ③  
21.   
22.   
23.     void menuItemHelpCallback(cocos2d::Ref* pSender);  
24.     void menuItemStartCallback(cocos2d::Ref* pSender);  
25.     void menuItemSettingCallback(cocos2d::Ref* pSender);  
26.     CREATE_FUNC(HelloWorld);  
27. };  
28.   
29.   
30.   
31.   
32. bool HelloWorld::init()  
33. {  
34.     if ( !Layer::init() )  
35.     {  
36.         return false;  
37.     }  
38.   
39.   
40.     log("HelloWorld init");  
41.   
42.   
43.     Size visibleSize = Director::getInstance()->getVisibleSize();  
44.     Point origin = Director::getInstance()->getVisibleOrigin();  
45.   
46.   
47.     Sprite *bg = Sprite::create("background.png");  
48.   
49.   
50.     bg->setPosition(Point(origin.x + visibleSize.width/2,  
51.         origin.y + visibleSize.height /2));  
52.     this->addChild(bg);  
53.   
54.   
55.     //开始精灵  
56.     Sprite *startSpriteNormal = Sprite::create("start-up.png");  
57.     Sprite *startSpriteSelected = Sprite::create("start-down.png");  
58.   
59.   
60.     MenuItemSprite *startMenuItem = MenuItemSprite::create(startSpriteNormal,   
61.         startSpriteSelected,  
62.         CC_CALLBACK_1(HelloWorld::menuItemStartCallback, this));  
63.     startMenuItem->setPosition(Director::getInstance()->convertToGL(Point(700, 170)));  
64.   
65.   
66.     // 设置图片菜单  
67.     MenuItemImage *settingMenuItem = MenuItemImage::create(  
68.         "setting-up.png",  
69.         "setting-down.png",  
70.         CC_CALLBACK_1(HelloWorld::menuItemSettingCallback, this));   
71.     settingMenuItem->setPosition(Director::getInstance()->convertToGL(Point(480, 400)));  
72.   
73.   
74.     // 帮助图片菜单  
75.     MenuItemImage *helpMenuItem = MenuItemImage::create(  
76.         "help-up.png",  
77.         "help-down.png",  
78.         CC_CALLBACK_1(HelloWorld::menuItemHelpCallback, this));   
79.     helpMenuItem->setPosition(Director::getInstance()->convertToGL(Point(860, 480)));  
80.   
81.   
82.     Menu* mu = Menu::create(startMenuItem, settingMenuItem, helpMenuItem, NULL);      
83.     mu->setPosition(Point::ZERO);  
84.     this->addChild(mu);  
85.   
86.   
87.     return true;  
88. }  
89.   
90.   
91. void HelloWorld::menuItemSettingCallback(Ref* pSender)  
92. {     
93.     auto sc = Setting::createScene();  
94.     auto reScene = TransitionJumpZoom::create(1.0f, sc);  
95.     Director::getInstance()->pushScene(reScene);  
96.     SimpleAudioEngine::getInstance()->playEffect("sound/Blip.wav");                  ②  
97. }  
98.   
99.   
100. void HelloWorld::menuItemHelpCallback(Ref* pSender)  
101. {  
102.     MenuItem* item = (MenuItem*)pSender;  
103.     log("Touch Help %p", item);  
104.     SimpleAudioEngine::getInstance()->playEffect("sound/Blip.wav");                  ③  
105. }  
106.   
107.   
108. void HelloWorld::menuItemStartCallback(Ref* pSender)  
109. {  
110.     MenuItem* item = (MenuItem*)pSender;  
111.     log("Touch Start %p", item);  
112.     SimpleAudioEngine::getInstance()->playEffect("sound/Blip.wav");                  ④  
113. }  
114.   
115.   
116. void HelloWorld::onEnter()  
117. {  
118.     Layer::onEnter();  
119.     log("HelloWorld onEnter");        
120. }  
121.   
122.   
123. void HelloWorld::onEnterTransitionDidFinish()  
124. {  
125.     Layer::onEnterTransitionDidFinish();  
126.     log("HelloWorld onEnterTransitionDidFinish");  
127.     //播放  
128.     SimpleAudioEngine::getInstance()->playBackgroundMusic("sound/Jazz.mp3", true);       ⑤  
129. }  
130.   
131.   
132. void HelloWorld::onExit()  
133. {  
134.     Layer::onExit();  
135.     log("HelloWorld onExit");  
136. }  
137.   
138.   
139. void HelloWorld::onExitTransitionDidStart()  
140. {  
141.     Layer::onExitTransitionDidStart();  
142.     log("HelloWorld onExitTransitionDidStart");  
143. }  
144.   
145.   
146. void HelloWorld::cleanup()  
147. {  
148.     Layer::cleanup();  
149.     log("HelloWorld cleanup");    
150.     //停止  
151.     SimpleAudioEngine::getInstance()->stopBackgroundMusic("sound/Jazz.mp3");         ⑥  
152. }  

上述代码第①行using namespace CocosDenshion是使用命名空间CocosDenshion，它是CocosDenshion引擎所需要的。代码②、③、④行SimpleAudioEngine::getInstance()->playEffect("sound/Blip.wav")是在点击菜单时候播放音效。第⑤行代码是onEnterTransitionDidFinish()函数中播放背景音乐。第⑥行代码是cleanup()函数中停止播放背景音乐。