技術標籤：Cocos2D-Xcocos2d

開啟cocos2dx工程後，HelloWorld一共就四個檔案。

AppDelegate.h

#ifndef  _APP_DELEGATE_H_
#define  _APP_DELEGATE_H_

#include "CCApplication.h"

/**
@brief	The cocos2d Application.

私有繼承的是由於CCDirector隱藏了一些介面
The reason for implement as private inheritance is to hide some interface call by CCDirector.
*/
 

class  AppDelegate : private cocos2d::CCApplication
{
public:
	AppDelegate();
	virtual ~AppDelegate();

    /**
	初始化OpenGL例項,設定路徑等
    @brief	Implement for initialize OpenGL instance, set source path, etc...
    */
    virtual bool initInstance();

    /**
	CCDirector和CCScene的初始化程式碼寫在這裡
    @brief	Implement CCDirector and CCScene init code here.
    @return true    Initialize success, app continue.
    @return false   Initialize failed, app terminate.
    */
 

    virtual bool applicationDidFinishLaunching();

    /**
	當app進入後臺時呼叫此函式
    @brief  The function be called when the application enter background
    @param  the pointer of the application
    */
    virtual void applicationDidEnterBackground();

    /**
	當app從後臺回到介面時呼叫此函式
    @brief  The function be called when the application enter foreground
    @param  the pointer of the application
    */
 

    virtual void applicationWillEnterForeground();
};
#endif // _APP_DELEGATE_H_

AppDelegate.cpp

#include "AppDelegate.h"

#include "cocos2d.h"
#include "HelloWorldScene.h"

#include "CCEGLView.h"

USING_NS_CC;

AppDelegate::AppDelegate() {

}

AppDelegate::~AppDelegate() {
}

bool AppDelegate::initInstance() {
	bool bRet = false;
	do {
// 下面這段#if和endif都是平臺的判斷，可以忽略
#if (CC_TARGET_PLATFORM == CC_PLATFORM_WIN32)

		// Initialize OpenGLView instance, that release by CCDirector when application terminate.
		// The HelloWorld is designed as HVGA.
		CCEGLView * pMainWnd = new CCEGLView();
		CC_BREAK_IF(! pMainWnd
				|| ! pMainWnd->Create(TEXT("cocos2d: Hello World"), 480, 320));

#endif  // CC_PLATFORM_WIN32
....
#if (CC_TARGET_PLATFORM == CC_PLATFORM_QNX)
		CCEGLView * pMainWnd = new CCEGLView();
		CC_BREAK_IF(! pMainWnd|| ! pMainWnd->Create(1024, 600));
		CCFileUtils::setResourcePath("app/native/Resources");
#endif // CC_PLATFORM_QNX
		bRet = true;
	} while (0);
	return bRet;
}

//
bool AppDelegate::applicationDidFinishLaunching() {
	// 初始化director
	CCDirector *pDirector = CCDirector::sharedDirector();

	pDirector->setOpenGLView(&CCEGLView::sharedOpenGLView());

	// enable High Resource Mode(2x, such as iphone4) and maintains low resource on other devices.
//     pDirector->enableRetinaDisplay(true);

	// 開啟左下角的FPS顯示
	pDirector->setDisplayFPS(true);


	// 設定FPS為每秒60幀
	pDirector->setAnimationInterval(1.0 / 60);

	// 建立一個場景，這個場景是一個會自動釋放的物件。 create a scene. it's an autorelease object
	CCScene *pScene = HelloWorld::scene();

	// 通過director執行場景
	pDirector->runWithScene(pScene);

	return true;
}

// 當app被後臺執行時，這個函式會呼叫。 如果有人打電話來，這個函式也會被呼叫。
// This function will be called when the app is inactive. When comes a phone call,it's be invoked too
void AppDelegate::applicationDidEnterBackground() {
	CCDirector::sharedDirector()->pause();

	// 如果使用了SimpleAudioEngine(聲音引擎)，那它必須要暫停
	// if you use SimpleAudioEngine, it must be pause
	// SimpleAudioEngine::sharedEngine()->pauseBackgroundMusic();
}

// 當app從後臺回覆後，此函式會被呼叫
// this function will be called when the app is active again
void AppDelegate::applicationWillEnterForeground() {
	CCDirector::sharedDirector()->resume();

	// 如果使用了SimpleAudioEngine(聲音引擎)，那它必須要恢復播放
	// if you use SimpleAudioEngine, it must resume here
	// SimpleAudioEngine::sharedEngine()->resumeBackgroundMusic();
}

HelloWorldScene.cpp

#include "HelloWorldScene.h"

USING_NS_CC;

CCScene* HelloWorld::scene()
{
	// 建立場景 
	CCScene *scene = CCScene::node();
	
	// 建立layer
	HelloWorld *layer = HelloWorld::node();

	// 把layer加到場景裡
	scene->addChild(layer);

	// return the scene
	return scene;
}

// 場景初始化
bool HelloWorld::init()
{
	//
	if ( !CCLayer::init() )
	{
		return false;
	}

	/
	
	// 新增一個"關閉"按鈕，用於關閉程式。
	// 第一個引數是 按鈕正常時圖片
	// 第二個引數是 按鈕被點選時圖片
	// 第三個引數指向本物件
	// 第四個引數是點選後的回撥函式
	CCMenuItemImage *pCloseItem = CCMenuItemImage::itemFromNormalImage(
										"CloseNormal.png",
										"CloseSelected.png",
										this,
										menu_selector(HelloWorld::menuCloseCallback) );
	// 設定按鈕位置
	pCloseItem->setPosition( ccp(CCDirector::sharedDirector()->getWinSize().width - 20, 20) );

	// 建立選單
	CCMenu* pMenu = CCMenu::menuWithItems(pCloseItem, NULL);
	pMenu->setPosition( CCPointZero );
	this->addChild(pMenu, 1);

	/
	// 3. add your codes below...

	// 建立一個字型標籤，用於展示"Hello World"
    CCLabelTTF* pLabel = CCLabelTTF::labelWithString("Hello World", "Arial", 24);
	// ask director the window size
	CCSize size = CCDirector::sharedDirector()->getWinSize();

	// 設定位置
	pLabel->setPosition( ccp(size.width / 2, size.height - 50) );

	// 將剛剛建立的標籤新增到layer上，層級=1
	this->addChild(pLabel, 1);

	// 用圖片建立一個精靈
	CCSprite* pSprite = CCSprite::spriteWithFile("HelloWorld.png");

	// 設定精靈的位置
	pSprite->setPosition( ccp(size.width/2, size.height/2) );

	// 把精靈加到layer上，層級=0
	this->addChild(pSprite, 0);
	
	return true;
}

// 點選關閉按鈕時的回撥函式
void HelloWorld::menuCloseCallback(CCObject* pSender)
{
	// 關閉dDirector
	CCDirector::sharedDirector()->end();

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

HelloWorldScene.h

此標頭檔案對應HelloWorldScene.cpp的註釋，就不補充了。

#ifndef __HELLOWORLD_SCENE_H__
#define __HELLOWORLD_SCENE_H__

#include "cocos2d.h"

class HelloWorld : public cocos2d::CCLayer
{
public:
	// Here's a difference. Method 'init' in cocos2d-x returns bool, instead of returning 'id' in cocos2d-iphone
	virtual bool init();  

	// there's no 'id' in cpp, so we recommand to return the exactly class pointer
	static cocos2d::CCScene* scene();
	
	// a selector callback
	virtual void menuCloseCallback(CCObject* pSender);

	// implement the "static node()" method manually
	LAYER_NODE_FUNC(HelloWorld);
};

#endif // __HELLOWORLD_SCENE_H__