Hello项目分析

main.cpp　　和所有项目一样  程序的主函数

// create the application instance
    AppDelegate app;
    CCEGLView& eglView = CCEGLView::sharedOpenGLView();
    eglView.setViewName("Hello World");
    eglView.setFrameSize(480, 320);
    // set the design resolution screen size, if you want to use Design Resoulution scaled to current screen, please uncomment next line.
    // eglView.setDesignResolutionSize(480, 320);

第三行意思是界面按照 OpenGL 的标准定义坐标

第四行设置界面的标题

第五行是设置尺寸

第七行我也不知道

AppDeletag.cpp

// initialize 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);

    // 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);

    // create a scene. it's an autorelease object
    CCScene *pScene = HelloWorld::scene();

    // run
    pDirector->runWithScene(pScene);

 第六行 用于开启视网膜屏的支持

第九行 显示左下角FPS 一位小数,最大60

#ifndef __HELLOWORLD_SCENE_H__
#define __HELLOWORLD_SCENE_H__

#include "cocos2d.h"

#include "SimpleAudioEngine.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
    void menuCloseCallback(CCObject* pSender);

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

第12行 初始化init()方法

第21行 是cocos2dx的新写法

LAYER_NODE_FUNC(HelloWorld);//cocos2dx 1.0 的写法

LAYER_CREATE_FUNC(HelloWorld);//cocos2dx 2.0 的写法