Hello项目分析

main.cpp　　和所有项目一样程序的主函数

1 // create the application instance
2     AppDelegate app;
3     CCEGLView& eglView = CCEGLView::sharedOpenGLView();
4     eglView.setViewName("Hello World");
5     eglView.setFrameSize(480, 320);
6     // set the design resolution screen size, if you want to use Design Resoulution scaled to current screen, please uncomment next line.
7     // 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

 1 // initialize director
 2     CCDirector *pDirector = CCDirector::sharedDirector();
 3     pDirector->setOpenGLView(&CCEGLView::sharedOpenGLView());
 4 
 5     // enable High Resource Mode(2x, such as iphone4) and maintains low resource on other devices.
 6 //     pDirector->enableRetinaDisplay(true);
 7 
 8     // turn on display FPS
 9     pDirector->setDisplayStats(true);
10 
11     // set FPS. the default value is 1.0/60 if you don't call this
12     pDirector->setAnimationInterval(1.0 / 60);
13 
14     // create a scene. it's an autorelease object
15     CCScene *pScene = HelloWorld::scene();
16 
17     // run
18     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

 1 #ifndef __HELLOWORLD_SCENE_H__
 2 #define __HELLOWORLD_SCENE_H__
 3 
 4 #include "cocos2d.h"
 5 
 6 #include "SimpleAudioEngine.h"
 7 
 8 class HelloWorld : public cocos2d::CCLayer
 9 {
10 public:
11     // Here's a difference. Method 'init' in cocos2d-x returns bool, instead of returning 'id' in cocos2d-iphone
12     virtual bool init();  
13 
14     // there's no 'id' in cpp, so we recommand to return the exactly class pointer
15     static cocos2d::CCScene* scene();
16     
17     // a selector callback
18     void menuCloseCallback(CCObject* pSender);
19 
20     // implement the "static node()" method manually
21     LAYER_CREATE_FUNC(HelloWorld);
22 };

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