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





详细介绍

A
一个导演同一时间只能运行一个场景，场景当中，可以同时加载多个层，一个层可以可载多个精灵。层中亦可以加层。

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:\Installed\cocos2d-x-2.2.3\tools\project-creator>

B

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
创建后的项目目录:



3
 简介

1
查看cocos2dx游戏的版本信息。

创建了一个cocos2dx项目之后，打开项目之后，会有如下项目结构



展开libcocos2d,找到cocos2d.cpp，双击打开此cpp文件，内容如下：

 

#include
"cocos2d.h"

 

NS_CC_BEGIN

 

const
char*
cocos2dVersion()

{

   
return
"2.2.3";

}

 

NS_CC_END

 

截图如下：



分析：

A 
由上可以看出项目的版本号是：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的一般是单例模式

}

进入run函数,
run的代码结构如下（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

#endif

}

 

总结：

1、对于cocos真正的初始化是在init()方法中

2、CCScene中的 
autorelease()完成了析构的过程

3、CCPointZero
表示的位置是CCPointMake(0,0);

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



抽出代码具体实现：

优点：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