cocos2d-x 下的HelloWorld

 参考了沈大海的博客：

为什么要定义windows平台

因为在不同平台有不同的程序入口实现方式,如windos平台有main.h和main.cpp,android平台有入口的Activity,iso平台有main.m,

但对于各平台的入口差异在cocos2d-x中做了完美的一致化处理，暂且不管是如何进行的，我们只需要基于一致的引擎入口进行开发就好了，

对于cocos2d-x引擎的入口我们定义为AppDelegate.h和AppDelegate.cpp看这里面的方法有三个。

如下图：windows下工程的入口和引擎入口：

这几个方法会在各平台应用程序状态改变时候自动回调。

而状态的改变在不同平台是有差异的，cocos2d-x定义cocos2d::CCApplication类统一了各平台的差异，在cocos2d-x中只有1个窗口在运行（符合移动平台，但pc平台原本不是这样），窗口在分配空间，加载完成，被覆盖，被恢复时候会自动回调CCApplication中的函数，因此CCApplication在不同的平台，有不同的实现cpp,

(有兴趣同学可以阅读cocos2ds/platform下面的源代码，从cocos2d::CCApplication.h开始)

看注释就已经很明白了：

和android的每个activity的活动周期差不多

 

#ifndef  _APP_DELEGATE_H_
#define  _APP_DELEGATE_H_

#include "cocos2d.h"

/**
@brief    The cocos2d Application.

The reason for implement as private inheritance is to hide some interface call by CCDirector.
*/
class  AppDelegate : private cocos2d::CCApplication
{
public:
    AppDelegate();
    virtual ~AppDelegate();

    /**
    @brief    Implement CCDirector and CCScene init code here.
    @return true    Initialize success, app continue.
    @return false   Initialize failed, app terminate.
    */
    virtual bool applicationDidFinishLaunching();

    /**
    @brief  The function be called when the application enter background
    @param  the pointer of the application
    */
    virtual void applicationDidEnterBackground();

    /**
    @brief  The function be called when the application enter foreground
    @param  the pointer of the application
    */
    virtual void applicationWillEnterForeground();
};

#endif // _APP_DELEGATE_H_

 

　　

 

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在这几个方法中，就可以做我们要做的事情了。

applicationDidFinishLaunching启动完成

加载游戏，播放音乐

applicationDidEnterBackground进入背景

音乐暂停，游戏暂停

applicationWillEnterForeground恢复窗口

音乐继续，游戏继续

可能，你会想，如果应用退出，我想保留游戏数据如何？

试者找找ccApplication中还有哪些方法。

 

bool AppDelegate::applicationDidFinishLaunching() {
    // initialize director 初始化导演，他是引擎的老大,单例模式
    CCDirector* pDirector = CCDirector::sharedDirector();

    CCEGLView* pEGLView = CCEGLView::sharedOpenGLView();
	//绑定opengles窗口，可见，我们可以自定义openGLView
    pDirector->setOpenGLView(pEGLView);
	CCSize frameSize = pEGLView->getFrameSize();

    // Set the design resolution
#if (CC_TARGET_PLATFORM == CC_PLATFORM_WINRT) || (CC_TARGET_PLATFORM == CC_PLATFORM_WP8)
    pEGLView->setDesignResolutionSize(designResolutionSize.width, designResolutionSize.height, kResolutionShowAll);
#else
    pEGLView->setDesignResolutionSize(designResolutionSize.width, designResolutionSize.height, kResolutionNoBorder);
#endif

    
    vector<string> searchPath;

    // In this demo, we select resource according to the frame's height.
    // If the resource size is different from design resolution size, you need to set contentScaleFactor.
    // We use the ratio of resource's height to the height of design resolution,
    // this can make sure that the resource's height could fit for the height of design resolution.

    // if the frame's height is larger than the height of medium resource size, select large resource.
	if (frameSize.height > mediumResource.size.height)
	{
        searchPath.push_back(largeResource.directory);

        pDirector->setContentScaleFactor(MIN(largeResource.size.height/designResolutionSize.height, largeResource.size.width/designResolutionSize.width));
	}
    // if the frame's height is larger than the height of small resource size, select medium resource.
    else if (frameSize.height > smallResource.size.height)
    {
        searchPath.push_back(mediumResource.directory);
        
        pDirector->setContentScaleFactor(MIN(mediumResource.size.height/designResolutionSize.height, mediumResource.size.width/designResolutionSize.width));
    }
    // if the frame's height is smaller than the height of medium resource size, select small resource.
	else
    {
        searchPath.push_back(smallResource.directory);

        pDirector->setContentScaleFactor(MIN(smallResource.size.height/designResolutionSize.height, smallResource.size.width/designResolutionSize.width));
    }


    // set searching path
    CCFileUtils::sharedFileUtils()->setSearchPaths(searchPath);
	
    // turn on display FPS
    pDirector->setDisplayStats(true);

    // set FPS. the default value is 1.0/60 if you don't call this
	//设置FPS 在cocos2d-x 启动后内部封装了FPS的逻辑，虽然helloWorld图片没变化，但其实一直在重绘。
    pDirector->setAnimationInterval(1.0 / 60);

    // create a scene. it's an autorelease object  创建一个场景
    CCScene *pScene = HelloWorld::scene(); 

    // run 显示这个场景到窗口，必然所有的绘制在场景中定义的
    pDirector->runWithScene(pScene);

    return true;
}

 

 

 

void HelloWorld::menuCloseCallback(CCObject* pSender)
{
	CCLog("click the menu");
#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 Director启动一个scene。

2 addChild

3 回调函数

4 CCLog