cocos2d-x学习（一） HelloWorld
前两天搭好了windows+VS2010+cocos2d-x 和MacMini+xcode+cocos2d-x两个开发环境。两个开发环境下的HelloWorld测试程序和自己添加的HelloWorld测试程序、
通过编译并顺利运行，具体的配置办法来自网络资料介绍，感谢强大的网路。万里长征第一步，在此Mark一下。
具体环境搭建方法网络上有许多的介绍，在此就不做复述。下面就自己对HelloWorld做具体分析。
因为Win32下和iOS下HelloWorld的结构十分相似，就那iOS下HelloWorld做举例分析。
首先程序启动进入程序入口函数，在main.m文件下
int main(int argc, char *argv[]) {
NSAutoreleasePool * pool = [[NSAutoreleasePoolalloc] init];
int retVal = UIApplicationMain(argc, argv, nil, @"AppController");
[pool release];
return retVal;
}
然后进入
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions函数。在该函数中创建窗口，并调
cocos2d::CCApplication::sharedApplication()->run();该函数调用
bool AppDelegate::applicationDidFinishLaunching()函数
bool AppDelegate::applicationDidFinishLaunching()
{
// initialize director
CCDirector *pDirector = CCDirector::sharedDirector();／／创建出导演类对象
pDirector->setOpenGLView(CCEGLView::sharedOpenGLView());
// 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);／／刷新屏幕的频率。实际上它影响到你的游戏所能达到的最大帧速率
// create a scene. it's an autorelease object
CCScene *pScene = HelloWorld::scene();／／HelloWorld的scene方法实际上是创建了一个CCScene 对象(autorelease,关于autorelease属性，个人理解为类似于C++中智能指针，采用引用计数的方法管理内存)
// run
pDirector->runWithScene(pScene);
returntrue;
}
下面就HelloWorld类做点分析
在HelloWorld.h文件中有个宏定义很关键
CREATE_FUNC(HelloWorld);
它的具体代码为
#define CREATE_FUNC(__TYPE__) \
static __TYPE__* create() \
{ \
__TYPE__ *pRet = new __TYPE__(); \
if (pRet && pRet->init()) \
{ \
pRet->autorelease(); \
return pRet; \
} \
else \
{ \
delete pRet; \
pRet = NULL; \
return NULL; \
} \
}
实际上这个宏定义中会调用HelloWorld中的init方法。
CCScene* HelloWorld::scene()
{
// 'scene' is an autorelease object
CCScene *scene = CCScene::create();／／关键代码，创建CCScene对象
// 'layer' is an autorelease object
HelloWorld *layer = HelloWorld::create();
// add layer as a child to scene
scene->addChild(layer);／／在scene上添加layer.
// return the scene
return scene;
}
// on "init" you need to initialize your instance
boolHelloWorld::init()//layer上添加的具体精灵的实现
{
//////////////////////////////
// 1. super init first
if ( !CCLayer::init() )
{
returnfalse;
}
/////////////////////////////
// 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(CCDirector::sharedDirector()->getWinSize().width/2 , CCDirector::sharedDirector()->getWinSize().width/2) );
/////////////////////////////
// 3. add your codes below..
// add a label shows "Hello World"
// create and initialize a label
CCLabelTTF* pLabel = CCLabelTTF::create("Box of chen", "Thonburi", 34);
// ask director the window size
// position the label on the center of the screen
pLabel->setPosition( ccp(CPercent::GetPercent(size.width, 50), CPercent::GetPercent(size.height, 90)) );
// add the label as a child to this layer
this->addChild(pLabel, 1);
// add "HelloWorld" splash screen"
CCSprite* pSprite = CCSprite::create("bgimg.jpg");
// position the sprite on the center of the screen
pSprite->setPosition( ccp(size.width/2, size.height/2) );
// add the sprite as a child to this layer
this->addChild(pSprite, 0);
returntrue;
}
void HelloWorld::menuCloseCallback(CCObject* pSender)
{
CCDirector::sharedDirector()->end();
#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
exit(0);
#endif
}
