cocos2d-x学习笔记(5)-- CCScene场景的切换

来源：未知责任编辑：智问网络发表时间:2013-10-07 00:58　点击:次

[cpp]

cocos2d-x学习笔记(5)-- CCScene场景的切换
step1：创建一个cocos2d-win32 application，并命名为simpleGame;
step:为了代码的整洁，我把上一节中的山和太阳这两个背景合为一个背景---LayerDay(白天)，同时将山和月亮合并为NightLayer夜景(晚上)
效果如下两张图
白天：

晚上：

在HelloWorldScene.h中添加LayerDay 、LayerNight和MyScene三个类：
[cpp]
/************************************************************************/
/* 白天的背景                                                                     */
/************************************************************************/

class LayerDay:public CCLayerColor
{

public:
    LayerDay();

    ~LayerDay();

public:
    virtual void onEnter();

};

/************************************************************************/
/* 晚上的背景                                                                     */
/************************************************************************/
class LayerNight:public CCLayerColor
{
public:
    LayerNight();

    ~LayerNight();

public:
    virtual void onEnter();

};

/************************************************************************/
/* 自定义场景                                                               */
/************************************************************************/
class MyScene:public CCScene
{
public:
    MyScene();
public:
    virtual void onEnter();

    virtual void runThisTest();

    void daySceneCallback(CCObject* pSender);

    void nightSceneCallback(CCObject* pSender);
};

在HelloWorldScene.cpp中修改HelloWorld::scene()如下：
[cpp]
CCScene* HelloWorld::scene()
{
    CCScene * scene = NULL;
    do
    {
        // 'scene' is an autorelease object
        scene = new MyScene();
        CC_BREAK_IF(! scene);

        // 'layer' is an autorelease object
        //HelloWorld *layer = HelloWorld::node();
        LayerDay* pLayer = new LayerDay();

        // add layer as a child to scene
        //addChild中的第二个参数为背景的次序，LayerHill在LayerCloud的上面，即表面。

        scene->addChild(pLayer,0);

    } while (0);

    // return the scene
    return scene;
}

然后添加三个类的成员函数：
[cpp]
/************************************************************************/
/* class LayerNight                                                                   */
/************************************************************************/

LayerNight::LayerNight()
{
    CCSize size = CCDirector::sharedDirector()->getWinSize();

    this->initWithColor(ccc4(0,0,0,255));
    CCSprite* pSpriteNight = CCSprite::spriteWithFile("night.png");
    CCSprite* pSpriteHill = CCSprite::spriteWithFile("hill.png");
    pSpriteNight->setPosition(ccp(size.width/2,size.height/2));
    pSpriteHill->setPosition(ccp(size.width/2,size.height/2));
    addChild(pSpriteNight);
    addChild(pSpriteHill);
}

LayerNight::~LayerNight()
{

}

void LayerNight::onEnter()
{
    CCLayer::onEnter();
}

/************************************************************************/
/* class LayerDay                                                                    */
/************************************************************************/

LayerDay::LayerDay ()
{

    this->initWithColor(ccc4(255,255,255,255));

    CCSize size = CCDirector::sharedDirector()->getWinSize();
    CCSprite* pSpriteHill = CCSprite::spriteWithFile("hill.png");
    CCSprite* pSpriteCloud = CCSprite::spriteWithFile("cloud.png");

    pSpriteCloud->setPosition(ccp(size.width/2,size.height/2));
    pSpriteHill->setPosition(ccp(size.width/2,size.height/2));
    addChild(pSpriteCloud);
    addChild(pSpriteHill);
}

LayerDay ::~LayerDay ()
{

}

void LayerDay ::onEnter()
{
    CCLayer::onEnter();
}

/************************************************************************/
/* 自定义场景                                                               */
/************************************************************************/
MyScene::MyScene()
{
    CCScene::init();
    CCLabelTTF* labelDay = CCLabelTTF::labelWithString("Day", "Arial",20);
    CCLabelTTF* labelNight = CCLabelTTF::labelWithString("Night", "Arial",20);

    CCMenuItemLabel* pMenuDayItem = CCMenuItemLabel::itemWithLabel(
        labelDay, this,menu_selector(MyScene::daySceneCallback));
    CCMenuItemLabel* pMenuNightItem = CCMenuItemLabel::itemWithLabel(
        labelNight, this,menu_selector(MyScene::nightSceneCallback));
    CCMenu* pMenuDay = CCMenu::menuWithItems(pMenuDayItem, NULL);
    CCMenu* pMenuNight = CCMenu::menuWithItems(pMenuNightItem, NULL);

    CCSize size = CCDirector::sharedDirector()->getWinSize();
    pMenuDayItem->setPosition(ccp(size.width/2 - 40, 30));
    pMenuNightItem->setPosition(ccp(size.width/2 + 40, 30));
    pMenuDay->setPosition(CCPointZero);
    pMenuNight->setPosition(CCPointZero);

    addChild(pMenuDay,2);
    addChild(pMenuNight,2);
}

void MyScene::daySceneCallback(CCObject *pSender)
{
    CCScene* scene =new MyScene();
    CCLayer* pLayer = new LayerDay();
    scene->addChild(pLayer, 0);
    CCDirector::sharedDirector()->pushScene(scene);
    scene->release();
    pLayer->release();
}

void MyScene::nightSceneCallback(CCObject* pSender)
{
    CCScene* scene =new MyScene();
    CCLayer* pLayer = new LayerNight();
    scene->addChild(pLayer, 0);
    CCDirector::sharedDirector()->pushScene(scene);
    scene->release();
    pLayer->release();
}

void MyScene::onEnter()
{
    CCScene::onEnter();
}

void MyScene::runThisTest()
{
    CCLayer* pLayer = new LayerNight();

    addChild(pLayer);
    pLayer->release();

    CCDirector::sharedDirector()->replaceScene(this);
}

step3:编译运行程序，就会出现如下画面，通过点击画面上的 "Day"和"Night"两个字样，就可以对场景进行切换。

但是，场景在切换时给人感觉很生硬，要想让场景间过度得更更自然、更绚丽，我们在HelloWorldScene.cpp中对代码做一些修改：
首先添加
CCTransitionScene* createTransition(cocos2d::ccTime t, CCScene* s)
{
return CCTransitionFadeUp::transitionWithDuration(t, s);//此处是场景切换时的效果
    //return CCTransitionFadeDown::transitionWithDuration(t, s);
    //return CCTransitionTurnOffTiles::transitionWithDuration(t, s);
    //return CCTransitionSplitRows::transitionWithDuration(t, s);
    //return CCTransitionSplitCols::transitionWithDuration(t, s);
//......