CCSpriteBatchNode 和 CCTextureAtlas 详解

CCSpriteBatchNode的初始化只要一张图片，也就是那张大图。

然后把所有用到那张大图里面的小图的sprite都加到 CCSpriteBatchNode的child，绘制效率就会提高。

下面是TestCpp中的Demo,SpriteTest

SpriteBatchNode1::SpriteBatchNode1()

{

    setTouchEnabled( true );//让当前Layer接收触摸事件

     //创建SpriteBatchNode对象和
CCTextureAtlas 的 四边形的 容量（缺省29）

    CCSpriteBatchNode* BatchNode = CCSpriteBatchNode::create("Images/grossini_dance_atlas.png", 50);

    //首先要把batchNode添加到Layer 可以通过 kTagSpriteBatchNode引用

    addChild(BatchNode, 0, kTagSpriteBatchNode);

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

    addNewSpriteWithCoords( ccp(s.width/2, s.height/2) );//添加一个子Sprite，所有的Sprite是添加到batchNode的child Sprite

}

void SpriteBatchNode1::addNewSpriteWithCoords(CCPoint p)

{

    CCSpriteBatchNode* BatchNode = (CCSpriteBatchNode*) getChildByTag( kTagSpriteBatchNode );//得到BatchNode

    int idx = CCRANDOM_0_1() * 1400 / 100;

    int x = (idx%5) * 85;

    int y = (idx/5) * 121; 

    CCSprite* sprite = CCSprite::createWithTexture(BatchNode->getTexture(), CCRectMake(x,y,85,121));                  //创建Sprite

    BatchNode->addChild(sprite); // 将创建好的Sprite添加到BatchNode

   sprite->setPosition( ccp( p.x, p.y) );//设定坐标

    //处理动画

   CCActionInterval* action;

    float random = CCRANDOM_0_1();

    if( random < 0.20 )

        action = CCScaleBy::create(3, 2);

    else if(random < 0.40)

        action = CCRotateBy::create(3, 360);

    else if( random < 0.60)

        action = CCBlink::create(1, 3);

    else if( random < 0.8 )

        action = CCTintBy::create(2, 0, -255, -255);

    else 

        action = CCFadeOut::create(2);

    CCActionInterval* action_back = action->reverse();

    CCActionInterval* seq = (CCActionInterval*)(CCSequence::create(action, action_back, NULL));

    sprite->runAction( CCRepeatForever::create(seq));// 在新创建的Sprite中应用动画

}

void SpriteBatchNode1::ccTouchesEnded(CCSet* touches, CCEvent* event)

{

    CCSetIterator it;

    CCTouch* touch;

    for( it = touches->begin(); it != touches->end(); it++) 

    {

        touch = (CCTouch*)(*it);

       if(!touch)

            break;

      CCPoint location = touch->getLocation();

        addNewSpriteWithCoords( location );//在触摸点添加Sprite层

    }

}

/////////////////////////////////////对SpriteBatchNode中的Sprite进行排序

void SpriteBatchNodeZOrder::reorderSprite(float dt)

{

    CCSpriteBatchNode* batch= (CCSpriteBatchNode*)(getChildByTag( kTagSpriteBatchNode ));

    CCSprite* sprite = (CCSprite*)(batch->getChildByTag(kTagSprite1));

     int z = sprite->getZOrder();

        if( z < -1 )

        m_dir = 1;

    if( z > 10 )

        m_dir = -1;

        z += m_dir * 3;

    batch->reorderChild(sprite, z);

}

/////////////////////////////////对SpriteBatchNode中的Sprite进行remove和add

void SpriteBatchNodeColorOpacity::removeAndAddSprite(float dt)

{    CCSpriteBatchNode* batch= (CCSpriteBatchNode*)(getChildByTag( kTagSpriteBatchNode ));

    CCSprite* sprite = (CCSprite*)(batch->getChildByTag(kTagSprite5));

        sprite->retain();

    batch->removeChild(sprite, false);

    batch->addChild(sprite, 0, kTagSprite5);

       sprite->release();

}

////////////////////////////////////////////////////////////////////////////////////////////////////////////

//在运行时动态修改纹理，适用于NPC升级，会影响所有的child Sprite

  CCSpriteBatchNode* batch = (CCSpriteBatchNode*) getChildByTag( kTagSpriteBatchNode );

    if( batch->getTexture() == m_texture1 )

        batch->setTexture(m_texture2);

    else

        batch->setTexture(m_texture1); 

////////////////////////////////////////////////////////////////////////////////////////////////////////////////

//SpriteFrameCatcher与SpriteBatchNode结合使用

void SpriteFrameTest::onEnter()

{

    SpriteTestDemo::onEnter();

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

    // IMPORTANT(重要声明):

    // The sprite frames will be cached AND RETAINED, and they won't be released unless you call

  //SpriteFames被缓存和重新引用，需要在不用的适用调用下面方法释放这些SpriteFrames

    //     CCSpriteFrameCache::sharedSpriteFrameCache()->removeUnusedSpriteFrames);

    CCSpriteFrameCache* cache = CCSpriteFrameCache::sharedSpriteFrameCache();

    cache->addSpriteFramesWithFile("animations/grossini.plist");

    cache->addSpriteFramesWithFile("animations/grossini_gray.plist", "animations/grossini_gray.png");

    cache->addSpriteFramesWithFile("animations/grossini_blue.plist", "animations/grossini_blue.png");

    //

    // Animation using Sprite BatchNode 使用BatchNode创建动画

    m_pSprite1 = CCSprite::createWithSpriteFrameName("grossini_dance_01.png");//从SpriteFameCache中创建一个Sprite

    m_pSprite1->setPosition( ccp( s.width/2-80, s.height/2) );

    CCSpriteBatchNode* spritebatch = CCSpriteBatchNode::create("animations/grossini.png");//创建SpriteBatchNode 这里要和
CCSpriteFrameCache一致

    spritebatch->addChild(m_pSprite1);//将Sprite添加到SpriteBatchNode

    addChild(spritebatch); //将SpriteBatchNode添加到当前layer

    CCArray* animFrames = CCArray::createWithCapacity(15);

    char str[100] = {0};

    for(int i = 1; i < 15; i++) 

    {

        sprintf(str, "grossini_dance_%02d.png", i);

        CCSpriteFrame* frame = cache->spriteFrameByName( str );  //创建动画的多帧SpriteFrame

        animFrames->addObject(frame);  //添加到CCArray集合

    }

    CCAnimation* animation = CCAnimation::createWithSpriteFrames(animFrames, 0.3f);//创建动画对象

    m_pSprite1->runAction( CCRepeatForever::create( CCAnimate::create(animation) ) );//Sprite载入动画Action

   // to test issue #732, uncomment the following line

    m_pSprite1->setFlipX(false);

    m_pSprite1->setFlipY(false);

    //

    // Animation using standard Sprite，根据标准的Sprite创建动画

    //

    m_pSprite2 = CCSprite::createWithSpriteFrameName("grossini_dance_01.png");

    m_pSprite2->setPosition( ccp( s.width/2 + 80, s.height/2) );

    addChild(m_pSprite2);

   CCArray* moreFrames = CCArray::createWithCapacity(20);

    for(int i = 1; i < 15; i++) 

    {

        sprintf(str, "grossini_dance_gray_%02d.png",i);

        CCSpriteFrame *frame = cache->spriteFrameByName(str);

        moreFrames->addObject(frame);

    }

   for( int i = 1; i < 5; i++) {

        sprintf(str, "grossini_blue_%02d.png",i);

        CCSpriteFrame *frame = cache->spriteFrameByName(str);

        moreFrames->addObject(frame);

    }

 // append frames from another batch

    moreFrames->addObjectsFromArray(animFrames);

    CCAnimation *animMixed = CCAnimation::createWithSpriteFrames(moreFrames, 0.3f);

   m_pSprite2->runAction(CCRepeatForever::create( CCAnimate::create(animMixed) ) );

   // to test issue #732, uncomment the following line

    m_pSprite2->setFlipX(false);

    m_pSprite2->setFlipY(false);

  schedule(schedule_selector(SpriteFrameTest::startIn05Secs), 0.5f);

    m_nCounter = 0;

}

void SpriteFrameTest::onExit()  //释放 CCSpriteFrameCache中没有使用的 SpriteFrame

{

    SpriteTestDemo::onExit();

    CCSpriteFrameCache *cache = CCSpriteFrameCache::sharedSpriteFrameCache();

    cache->removeSpriteFramesFromFile("animations/grossini.plist");

    cache->removeSpriteFramesFromFile("animations/grossini_gray.plist");

    cache->removeSpriteFramesFromFile("animations/grossini_blue.plist");

}

CCTextureAtlas 纹理图集。说白了，它本身保存一张大图的纹理和一个记录画大图某一区域的信息结构体的数组。

5  int  m_uCapacity ，四边形的容量。