cocos2d-x百分比读取进度及资源加载

最新推荐文章于 2024-04-20 22:35:52 发布

转载最新推荐文章于 2024-04-20 22:35:52 发布 · 798 阅读

本文详细介绍了如何使用Cocos2d-x 2.0版本进行资源加载，并通过回调机制实时更新加载进度。通过加载多个图片并触发回调函数，展示了如何在场景中动态添加元素，最终实现加载完成后的场景展示。

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昨天下载了最新的cocos2d-x 是2.0.1版本的...所以本文章是参考2.0版本的例子写的...

可以发现,2.0版本后不单单只有一个帧率了..还多了两个参数.第一个参数可以理解为场景中的对象个数吧.第二个还不清楚...

1. 创建好一个工程后,先修改对于的.h文件

[cpp]view plaincopy 
   
 class HelloWorld : public cocos2d::CCLayer  
 {  
 public:  
     virtual bool init();    
     static cocos2d::CCScene* scene();  
     HelloWorld();  
   
     void addSprite();//用于加载完成后添加精灵  
     void loadingCallBack(cocos2d::CCObject *obj);//读进度回调函数  
   
     LAYER_CREATE_FUNC(HelloWorld);  
   
 private:  
     cocos2d::CCLabelTTF *m_pLableLoading;  
     cocos2d::CCLabelTTF *m_pLabelPercent;  
     int m_nNumberOfSprites;  
     int m_nNumberOfLoadedSprites;  
 };  

2. 然后在对应的cpp文件中完成各种函数

[cpp]view plaincopy 
   
 //原例子中的代码都是在构造函数中写的.在这里构造函数只用于初始化了两个成员变量  
 HelloWorld::HelloWorld():m_nNumberOfSprites(20),m_nNumberOfLoadedSprites(0)  
 {  
   
 }  

[cpp]view plaincopy 
   
 bool HelloWorld::init()  
 {  
     bool bRet = false;  
     do   
     {  
         CC_BREAK_IF(! CCLayer::init());  
         CCSize size = CCDirector::sharedDirector()->getWinSize();  
   
         //创建读条时的标签  
         m_pLableLoading = CCLabelTTF::create("Loading...","Arial",20);  
         m_pLabelPercent = CCLabelTTF::create("%0","Arial",30);  
           
         m_pLabelPercent->setPosition(CCPointMake(size.width/2, size.height/2 +50));  
         m_pLableLoading->setPosition(CCPointMake(size.width/2, size.height/2 -10));  
   
         this->addChild(m_pLableLoading);  
         this->addChild(m_pLabelPercent);  
   
         //加载图片到Cache...每加载一次就调用我们自己写的回调函数  
         CCTextureCache::sharedTextureCache()->addImageAsync("img/bg.png", this, callfuncO_selector(HelloWorld::loadingCallBack));  
         CCTextureCache::sharedTextureCache()->addImageAsync("img/01.png", this, callfuncO_selector(HelloWorld::loadingCallBack));  
         CCTextureCache::sharedTextureCache()->addImageAsync("img/02.png", this, callfuncO_selector(HelloWorld::loadingCallBack));  
         CCTextureCache::sharedTextureCache()->addImageAsync("img/03.png", this, callfuncO_selector(HelloWorld::loadingCallBack));  
         CCTextureCache::sharedTextureCache()->addImageAsync("img/04.png", this, callfuncO_selector(HelloWorld::loadingCallBack));  
         CCTextureCache::sharedTextureCache()->addImageAsync("img/05.png", this, callfuncO_selector(HelloWorld::loadingCallBack));  
         CCTextureCache::sharedTextureCache()->addImageAsync("img/06.png", this, callfuncO_selector(HelloWorld::loadingCallBack));  
         CCTextureCache::sharedTextureCache()->addImageAsync("img/07.png", this, callfuncO_selector(HelloWorld::loadingCallBack));  
         CCTextureCache::sharedTextureCache()->addImageAsync("img/08.png", this, callfuncO_selector(HelloWorld::loadingCallBack));  
         CCTextureCache::sharedTextureCache()->addImageAsync("img/09.png", this, callfuncO_selector(HelloWorld::loadingCallBack));  
         CCTextureCache::sharedTextureCache()->addImageAsync("img/10.png", this, callfuncO_selector(HelloWorld::loadingCallBack));  
         CCTextureCache::sharedTextureCache()->addImageAsync("img/11.png", this, callfuncO_selector(HelloWorld::loadingCallBack));  
         CCTextureCache::sharedTextureCache()->addImageAsync("img/12.png", this, callfuncO_selector(HelloWorld::loadingCallBack));  
         CCTextureCache::sharedTextureCache()->addImageAsync("img/13.png", this, callfuncO_selector(HelloWorld::loadingCallBack));  
         CCTextureCache::sharedTextureCache()->addImageAsync("img/14.png", this, callfuncO_selector(HelloWorld::loadingCallBack));  
         CCTextureCache::sharedTextureCache()->addImageAsync("img/15.png", this, callfuncO_selector(HelloWorld::loadingCallBack));  
         CCTextureCache::sharedTextureCache()->addImageAsync("img/16.png", this, callfuncO_selector(HelloWorld::loadingCallBack));  
         CCTextureCache::sharedTextureCache()->addImageAsync("img/17.png", this, callfuncO_selector(HelloWorld::loadingCallBack));  
         CCTextureCache::sharedTextureCache()->addImageAsync("img/18.png", this, callfuncO_selector(HelloWorld::loadingCallBack));  
         CCTextureCache::sharedTextureCache()->addImageAsync("img/19.png", this, callfuncO_selector(HelloWorld::loadingCallBack));  
   
         bRet = true;  
     } while (0);  
   
     return bRet;  
 }  

3. 代码很多都是重复的..只是加载的图片不一样,大家注意加载的图片路径就可以了..接下来实现回调函数

[cpp]view plaincopy 
   
 //回调函数  
 void HelloWorld::loadingCallBack(CCObject *obj)  
 {  
     ++m_nNumberOfLoadedSprites;//每调用一次就+1  
     char tmp[10];  
   
     //这里格式化,因为我们只加载了20张图片,所以除以总数后就是0.05,所以每加载一次就涨5%  
     sprintf(tmp,"%%%d",(int)(((float)m_nNumberOfLoadedSprites / m_nNumberOfSprites) * 100));  
     m_pLabelPercent->setString(tmp);//重设标签的内容  
   
     //判断,如果全部加载完成后,就执行  
     if (m_nNumberOfLoadedSprites == m_nNumberOfSprites)  
     {  
         //移除那两个标签文字..  
         this->removeChild(m_pLableLoading, true);  
         this->removeChild(m_pLabelPercent, true);  
         //调用自己写的函数..从新绘制场景内容  
         addSprite();  
     }  
       
 }  

4. 实现addSprite()函数，这个函数从新初始化了场景..然后显示

[cpp]view plaincopy 
   
 void HelloWorld::addSprite()  
 {  
     CCSize size = CCDirector::sharedDirector()->getWinSize();  
   
     //创建背景图片  
     CCSprite *bg = CCSprite::create("img/bg.png");  
     bg->setPosition(CCPointMake(size.width/2, size.height/2));  
   
     //创建其他小图片  
     CCSprite *s1 = CCSprite::create("img/01.png");  
     CCSprite *s2 = CCSprite::create("img/02.png");  
     CCSprite *s3 = CCSprite::create("img/03.png");  
     CCSprite *s4 = CCSprite::create("img/04.png");  
     CCSprite *s5 = CCSprite::create("img/05.png");  
     CCSprite *s6 = CCSprite::create("img/06.png");  
     CCSprite *s7 = CCSprite::create("img/07.png");  
     CCSprite *s8 = CCSprite::create("img/08.png");  
     CCSprite *s9 = CCSprite::create("img/09.png");  
     CCSprite *s10 = CCSprite::create("img/10.png");  
     CCSprite *s11 = CCSprite::create("img/11.png");  
     CCSprite *s12 = CCSprite::create("img/12.png");  
     CCSprite *s13 = CCSprite::create("img/13.png");  
     CCSprite *s14 = CCSprite::create("img/14.png");  
     CCSprite *s15 = CCSprite::create("img/15.png");  
     CCSprite *s16 = CCSprite::create("img/16.png");  
     CCSprite *s17 = CCSprite::create("img/17.png");  
     CCSprite *s18 = CCSprite::create("img/18.png");  
     CCSprite *s19 = CCSprite::create("img/19.png");  
   
     //设置位置  
     s1->setPosition(CCPointMake(70, size.height/2));  
     s2->setPosition(CCPointMake(90, size.height/2));  
     s3->setPosition(CCPointMake(110, size.height/2));  
     s4->setPosition(CCPointMake(130, size.height/2));  
     s5->setPosition(CCPointMake(150, size.height/2));  
     s6->setPosition(CCPointMake(170, size.height/2));  
     s7->setPosition(CCPointMake(190, size.height/2));  
     s8->setPosition(CCPointMake(210, size.height/2));  
     s9->setPosition(CCPointMake(230, size.height/2));  
     s10->setPosition(CCPointMake(250, size.height/2));  
     s11->setPosition(CCPointMake(270, size.height/2));  
     s12->setPosition(CCPointMake(290, size.height/2));  
     s13->setPosition(CCPointMake(310, size.height/2));  
     s14->setPosition(CCPointMake(330, size.height/2));  
     s15->setPosition(CCPointMake(350, size.height/2));  
     s16->setPosition(CCPointMake(370, size.height/2));  
     s17->setPosition(CCPointMake(390, size.height/2));  
     s18->setPosition(CCPointMake(410, size.height/2));  
     s19->setPosition(CCPointMake(430, size.height/2));  
   
     //添加进入场景  
     this->addChild(bg);  
   
     this->addChild(s1);  
     this->addChild(s2);  
     this->addChild(s3);  
     this->addChild(s4);  
     this->addChild(s5);  
     this->addChild(s6);  
     this->addChild(s7);  
     this->addChild(s8);  
     this->addChild(s9);  
     this->addChild(s10);  
     this->addChild(s11);  
     this->addChild(s12);  
     this->addChild(s13);  
     this->addChild(s14);  
     this->addChild(s15);  
     this->addChild(s16);  
     this->addChild(s17);  
     this->addChild(s18);  
     this->addChild(s19);  
 }  