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