cocos2d-x学习笔记(5)-- CCScene场景的切换

cocos2d-x学习笔记(5)-- CCScene场景的切换

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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：

/************************************************************************/
/* 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：

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：

/************************************************************************/
/* 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);

  //......

}

 

 再次运行程序，这次效果是不是好多了呢！

 

 

 

 

 源代码下载地址：http://download.csdn.net/download/wen294299195/4525796