1 游戏逻辑架构，Cocos2d-x游戏项目创建，HelloWorld项目创建，HelloWorld程序分析，（CCApplicationProtocol，CCApplication，AppDeleg

1 游戏逻辑架构

具体介绍

A 一个导演同一时间仅仅能执行一个场景，场景其中，能够同一时候载入多个层，一个层能够可载多个精灵。层中亦能够加层。

B 场景切换

sceneàaddChild(layer);

layeràaddChild(sprite);

2 项目创建命令：

A 进入tools下的project-creat

E:Installedcocos2d-x-2.2.3 oolsproject-creator>

python create_project.py -project MyCocos2dx -package com.toto.mycocos01 -language cpp

C 命令解释：

-project MyCocos2dx工程名

-package com.toto.mycocos01 包名

-language cpp 开发语言可选项目有javascript lua

D 创建后的项目文件夹:

3 简单介绍

1 查看cocos2dx游戏的版本号信息。

创建了一个cocos2dx项目之后，打开项目之后，会有例如以下项目结构

展开libcocos2d,找到cocos2d.cpp，双击打开此cpp文件，内容例如以下：

#include "cocos2d.h"

NS_CC_BEGIN

const char* cocos2dVersion()

{

return "2.2.3";

}

NS_CC_END

截图例如以下：

分析：

A 由上能够看出项目的版本是：2.2.3

B 依赖的头文件 “cocos2d.h”

2 查看程序入口

程序入口是：main.cpp

#include "main.h"

#include "AppDelegate.h"

#include "CCEGLView.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; //Delegate:表示委派…为代表 n:代表

CCEGLView* eglView = CCEGLView::sharedOpenGLView();

eglView->setViewName("MyCocos2dx"); //程序的标题

eglView->setFrameSize(480, 320); //程序的尺寸

return CCApplication::sharedApplication()->run(); //关于shared的通常是单例模式

}

进入run函数, run的代码结构例如以下（选中run(),再按F12进行查看）：

int CCApplication::run()

{

PVRFrameEnableControlWindow(false);

// Main message loop:

MSG msg;

LARGE_INTEGER nFreq;

LARGE_INTEGER nLast;

LARGE_INTEGER nNow;

QueryPerformanceFrequency(&nFreq);

QueryPerformanceCounter(&nLast);

// Initialize instance and cocos2d.

if (!applicationDidFinishLaunching())

{

return 0;

}

CCEGLView* pMainWnd = CCEGLView::sharedOpenGLView();

pMainWnd->centerWindow();

ShowWindow(pMainWnd->getHWnd(), SW_SHOW);

while (1)

{

if (! PeekMessage(&msg, NULL, 0, 0, PM_REMOVE))

{

// Get current time tick.

QueryPerformanceCounter(&nNow);

// If it's the time to draw next frame, draw it, else sleep a while.

if (nNow.QuadPart - nLast.QuadPart > m_nAnimationInterval.QuadPart)

{

nLast.QuadPart = nNow.QuadPart;

CCDirector::sharedDirector()->mainLoop();

}

else

{

Sleep(0);

}

continue;

}

if (WM_QUIT == msg.message)

{

// Quit message loop.

break;

}

// Deal with windows message.

if (! m_hAccelTable || ! TranslateAccelerator(msg.hwnd, m_hAccelTable, &msg))

{

TranslateMessage(&msg);

DispatchMessage(&msg);

}

return (int) msg.wParam;

}

程序的入口：applicationDidFinishLaunching()

AppDelegate.cpp

bool AppDelegate::applicationDidFinishLaunching() {

// initialize director

CCDirector* pDirector = CCDirector::sharedDirector();

CCEGLView* pEGLView = CCEGLView::sharedOpenGLView();

pDirector->setOpenGLView(pEGLView);

// turn on display FPS

pDirector->setDisplayStats(true);

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

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

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

CCScene *pScene = HelloWorld::scene();

// run

pDirector->runWithScene(pScene);

return true;

}

截图：

HelloWorldScene.h HelloWorld类的本质是一个层（CCLayer）：

#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 recommend returning the class instance pointer

static cocos2d::CCScene* scene();

// a selector callback

void menuCloseCallback(CCObject* pSender);

// implement the "static node()" method manually

CREATE_FUNC(HelloWorld);

};

#endif // __HELLOWORLD_SCENE_H__

HelloWorldScene.cpp

#include "HelloWorldScene.h"

USING_NS_CC;

CCScene* HelloWorld::scene()

{

// 'scene' is an autorelease object

CCScene *scene = CCScene::create();

// 'layer' is an autorelease object

HelloWorld *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 ( !CCLayer::init() )

{

return false;

}

CCSize visibleSize = CCDirector::sharedDirector()->getVisibleSize();

CCPoint origin = CCDirector::sharedDirector()->getVisibleOrigin();

/////////////////////////////

// 2. add a menu item with "X" image, which is clicked to quit the program

// you may modify it.

// add a "close" icon to exit the progress. it's an autorelease object

CCMenuItemImage *pCloseItem = CCMenuItemImage::create(

"CloseNormal.png",

"CloseSelected.png",

this,

menu_selector(HelloWorld::menuCloseCallback));

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

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

// create menu, it's an autorelease object

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

pMenu->setPosition(CCPointZero);

this->addChild(pMenu, 1);

/////////////////////////////

// 3. add your codes below...

// add a label shows "Hello World"

// create and initialize a label

CCLabelTTF* pLabel = CCLabelTTF::create("Hello World", "Arial", 24);

// position the label on the center of the screen

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

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

// add the label as a child to this layer

this->addChild(pLabel, 1);

// add "HelloWorld" splash screen"

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

// position the sprite on the center of the screen

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

// add the sprite as a child to this layer

this->addChild(pSprite, 0);

return true;

}

void HelloWorld::menuCloseCallback(CCObject* pSender)

{

#if (CC_TARGET_PLATFORM == CC_PLATFORM_WINRT) || (CC_TARGET_PLATFORM == CC_PLATFORM_WP8)

CCMessageBox("You pressed the close button. Windows Store Apps do not implement a close button.","Alert");

#else

CCDirector::sharedDirector()->end();

#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)

exit(0);

#endif

}

总结：

1、对于cocos真正的初始化是在init()方法中

2、CCScene中的 autorelease()完毕了析构的过程

3、CCPointZero 表示的位置是CCPointMake(0,0);

4 （CCApplicationProtocol，CCApplication，AppDelegate）三个类的类关系介绍：

抽出代码详细实现：

长处：屏蔽了平台的差异性，实现跨平台

1 CCApplicationProtocol 定义了接口

#ifndef __CC_APPLICATION_PROTOCOL_H__

#define __CC_APPLICATION_PROTOCOL_H__

NS_CC_BEGIN

enum TargetPlatform

{

kTargetWindows,

kTargetLinux,

kTargetMacOS,

kTargetAndroid,

kTargetIphone,

kTargetIpad,

kTargetBlackBerry,

kTargetNaCl,

kTargetEmscripten,

kTargetTizen,

kTargetWinRT,

kTargetWP8

};

/**

* @addtogroup platform

* @{

* @js NA

* @lua NA

class CC_DLL CCApplicationProtocol

{

public:

virtual ~CCApplicationProtocol() {}

/**

@brief Implement CCDirector and CCScene init code here.

@return true Initialize success, app continue.

@return false Initialize failed, app terminate.

virtual bool applicationDidFinishLaunching() = 0; //这个类是一个纯虚函数

/**

@brief The function be called when the application enter background

@param the pointer of the application

virtual void applicationDidEnterBackground() = 0;

/**

@brief The function be called when the application enter foreground

@param the pointer of the application

virtual void applicationWillEnterForeground() = 0;

/**

@brief Callback by CCDirector for limit FPS.

@interval The time, expressed in seconds, between current frame and next.

virtual void setAnimationInterval(double interval) = 0;

/**

@brief Get current language config

@return Current language config

virtual ccLanguageType getCurrentLanguage() = 0;

/**

@brief Get target platform

virtual TargetPlatform getTargetPlatform() = 0;

};

// end of platform group

/// @}

NS_CC_END

#endif // __CC_APPLICATION_PROTOCOL_H__

2 CCApplication 各个平台不同的逻辑

3 AppDelegate 私有继承了CCApplication 仅实现CCApplicationProtocol 里的接口