Learning Cocos2d-x for WP8（2）——深入刨析Hello World

原文:Learning Cocos2d-x for WP8（2）——深入刨析Hello World

cocos2d-x框架

在兄弟篇Learning Cocos2d-x for XNA（1）——小窥cocos2d-x框架中已有详细介绍cocos2d-x框架下的基本元素。可自行参考学习，概念的东西基本一样。

HelloWorld

HelloWorld程序虽然简单，但能测试程序是否能正确的运行，同时很能体现一个框架的整体结构。

cocos2d-x中HelloWorld显示主要通过AppDelegate和HelloWorldScene。

在显示HelloWorld程序时，得将图片资源放进Assets文件夹中

AppDelegate

C++程序中最主要的是头文件(.h)和源文件(.cpp)。

AppDelegate.h

AppDelegate.h头文件中，定义类(Class)AppDelegate继承CCApplication。在AppDelegate中声明相关方法。

AppDelegate.cpp

AppDelegate.cpp源文件中包含AppDelegate.h头文件，在其中实现头文件中声明的方法。

其中在方法applicationDidFinishLaunching中，我们找到了熟悉的CCDirector（导演），当中pScene为起始页面。很显然HelloWorld类，需要在AppDelegate.cpp中引用Classes文件夹中的HelloWorldScene.h头文件（fei话，呵呵）。

HelloWorldScene

scene()方法

主要负责将Layer层通过addChild到Scene层

init()方法

主要将Layer层以下层内容添加到Layer层。

HelloWorld::init()

 bool HelloWorld::init()
 {
     bool bRet = false;

     do
     {
         if ( !CCLayer::init() )
         {
             break;
         }
         this->setIsTouchEnabled(true);

         CCSize screenSize = CCDirector::sharedDirector()->getWinSize();

         // 1. Add a menu item with "X" image, which is clicked to quit the program.

         // Create a "close" menu item with close icon, it's an auto release object.
         CCMenuItemImage *pCloseItem = CCMenuItemImage::itemFromNormalImage(
             "CloseNormal.png",
             "CloseSelected.png",
             this,
             menu_selector(HelloWorld::menuCloseCallback));
         CC_BREAK_IF(! pCloseItem);

         // Place the menu item bottom-right conner.
         pCloseItem->setPosition(ccp(CCDirector::sharedDirector()->getWinSize().width - , ));

         // Create a menu with the "close" menu item, it's an auto release object.
         CCMenu* pMenu = CCMenu::menuWithItems(pCloseItem, NULL);
         pMenu->setPosition(CCPointZero);
         CC_BREAK_IF(! pMenu);

         // Add the menu to HelloWorld layer as a child layer.
         this->addChild(pMenu, );

         // 2. Add a label shows "Hello World".

         // Create a label and initialize with string "Hello World".
         CCLabelTTF* pLabel = CCLabelTTF::labelWithString("Hello World", "Arial", );
         CC_BREAK_IF(! pLabel);

         // Get window size and place the label upper.
         CCSize size = CCDirector::sharedDirector()->getWinSize();
         pLabel->setPosition(ccp(size.width / , size.height - ));

         // Add the label to HelloWorld layer as a child layer.
         this->addChild(pLabel, );

         // 3. Add add a splash screen, show the cocos2d splash image.
         CCSprite* pSprite = CCSprite::spriteWithFile("HelloWorld.png");
         CC_BREAK_IF(! pSprite);

         // Place the sprite on the center of the screen
         pSprite->setPosition(ccp(size.width/, size.height/));

         // Add the sprite to HelloWorld layer as a child layer.
         this->addChild(pSprite, );

         bRet = true;
     } while ();

     return bRet;
 }

HelloWorldScene.h完整代码

HelloWorldScene.h

 #ifndef __HELLOWORLD_SCENE_H__
 #define __HELLOWORLD_SCENE_H__

 #include "cocos2d.h"
 #include "SimpleAudioEngine.h"

 class HelloWorld : public cocos2d::CCLayer
 {
 public:
     HelloWorld();
     ~HelloWorld();

     // 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_NODE_FUNC(HelloWorld);
 };

 #endif  // __HELLOWORLD_SCENE_H__

HelloWorldScene.cpp完整代码

HelloWorldScene.cpp

 #include "pch.h"
 #include "HelloWorldScene.h"

 using namespace cocos2d;

 HelloWorld::~HelloWorld()
 {
     // cpp don't need to call super dealloc
     // virtual destructor will do this
 }

 HelloWorld::HelloWorld()
 {
 }

 CCScene* HelloWorld::scene()
 {
     CCScene * scene = NULL;
     do
     {
         // 'scene' is an autorelease object
         scene = CCScene::node();
         CC_BREAK_IF(! scene);

         // 'layer' is an autorelease object
         HelloWorld *layer = HelloWorld::node();
         CC_BREAK_IF(! layer);

         // add layer as a child to scene
         scene->addChild(layer);
     } while ();

     // return the scene
     return scene;
 }

 // on "init" you need to initialize your instance
 bool HelloWorld::init()
 {
     bool bRet = false;

     do
     {
         if ( !CCLayer::init() )
         {
             break;
         }
         this->setIsTouchEnabled(true);

         CCSize screenSize = CCDirector::sharedDirector()->getWinSize();

         // 1. Add a menu item with "X" image, which is clicked to quit the program.

         // Create a "close" menu item with close icon, it's an auto release object.
         CCMenuItemImage *pCloseItem = CCMenuItemImage::itemFromNormalImage(
             "CloseNormal.png",
             "CloseSelected.png",
             this,
             menu_selector(HelloWorld::menuCloseCallback));
         CC_BREAK_IF(! pCloseItem);

         // Place the menu item bottom-right conner.
         pCloseItem->setPosition(ccp(CCDirector::sharedDirector()->getWinSize().width - , ));

         // Create a menu with the "close" menu item, it's an auto release object.
         CCMenu* pMenu = CCMenu::menuWithItems(pCloseItem, NULL);
         pMenu->setPosition(CCPointZero);
         CC_BREAK_IF(! pMenu);

         // Add the menu to HelloWorld layer as a child layer.
         this->addChild(pMenu, );

         // 2. Add a label shows "Hello World".

         // Create a label and initialize with string "Hello World".
         CCLabelTTF* pLabel = CCLabelTTF::labelWithString("Hello World", "Arial", );
         CC_BREAK_IF(! pLabel);

         // Get window size and place the label upper.
         CCSize size = CCDirector::sharedDirector()->getWinSize();
         pLabel->setPosition(ccp(size.width / , size.height - ));

         // Add the label to HelloWorld layer as a child layer.
         this->addChild(pLabel, );

         // 3. Add add a splash screen, show the cocos2d splash image.
         CCSprite* pSprite = CCSprite::spriteWithFile("HelloWorld.png");
         CC_BREAK_IF(! pSprite);

         // Place the sprite on the center of the screen
         pSprite->setPosition(ccp(size.width/, size.height/));

         // Add the sprite to HelloWorld layer as a child layer.
         this->addChild(pSprite, );

         bRet = true;
     } while ();

     return bRet;
 }

 void HelloWorld::menuCloseCallback(CCObject* pSender)
 {
     // "close" menu item clicked
     CCDirector::sharedDirector()->end();
 }

版本cocos2dx-0.13.0-wp8-0.8似乎不怎么给力，Lumia820真机上测试不通过，模拟器没任何问题。不过快有新版本出来了吧，现在凑合学习学习。

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