编写小游戏《贪头蛇》第二篇

源代码下载地址：http://download.csdn.net/detail/oyangyufu/7505487

该篇主要实现四个菜单button回调功能，切换到相应场景

关于页面

代码：

SnakeSceneManager类管理全部场景切换，仅仅须要实例一个对象调用。关于场景切换：

void SnakeSceneManager::aboutlayer()
{
	CCScene *aboutscene = CCScene::create();
	AboutLayer *AL = AboutLayer::create();
	aboutscene->addChild(AL);
	CCDirector::sharedDirector()->replaceScene(CCTransitionFadeTR::create(1.5f, aboutscene));
}

进入AboutLayer类。初始化该场景

	//图层背景
	CCSize size = CCDirector::sharedDirector()->getVisibleSize();
	CCSprite *sp1 = CCSprite::create("bckgr.png");
	sp1->setAnchorPoint(ccp(0.5f, 0.5f));
	sp1->setPosition(ccp(size.width/2, size.height/2));
	this->addChild(sp1);

	//文本
	CCLabelTTF *label = CCLabelTTF::create("		Snake is a classic mobile phone game, 

												simple and resistance to play.By 

												controlling the direction of the 

												snake eating the eggs that snake 

												longer, to obtain the integral.",
											"Helvetica", 20, ccp(480, 320),  kCCTextAlignmentLeft);
	//label->setAnchorPoint(ccp(1.0f, 1.0f));
	label->setPosition(ccp(size.width/2+100,size.height/2-80));
	this->addChild(label);

	//返回主菜单button
	CCMenuItemImage *image1 = CCMenuItemImage::create("menuHome.png", "menuHome2.png", this, menu_selector(AboutLayer::toback));
	image1->setPosition(ccp(size.width/2, 50));
	image1->setScale(0.5f);

	CCMenu *menu = CCMenu::create(image1, NULL);
	menu->setPosition(CCPointZero);
	this->addChild(menu);

切换到主菜单页面

void AboutLayer::toback(CCObject *Obj)
{
	ssm->MenuScene();
}

设置页面

代码：

切换该场景

void SnakeSceneManager::setlayer()
{
	CCScene *setLayer = CCScene::create();
	SetLayer *SL = SetLayer::create();//设置图层
	setLayer->addChild(SL);
	CCDirector::sharedDirector()->replaceScene(CCTransitionFadeTR::create(1.5f, setLayer));	
}

进入SetLayer类，初始化该场景

	//设置图层背景
	CCSize size = CCDirector::sharedDirector()->getVisibleSize();
	CCSprite *spr1 = CCSprite::create("bckgr.png");
	spr1->setPosition(ccp(size.width/2, size.height/2));
	this->addChild(spr1);

	//音乐
	CCLabelTTF *labe = CCLabelTTF::create("SetMusic:", "Helvetica", 20, ccp(100, 20),kCCTextAlignmentLeft) ;
	labe->setPosition(ccp(size.width/2-50, size.height/2+50));
	this->addChild(labe);

	//音乐设置button
	image1 = CCMenuItemImage::create("sound-on-A.png", "sound-off-A.png", this, menu_selector(SetLayer::tosetmusic));
	image1->setScale(0.5f);
	image1->setPosition(ccp(size.width/2+30, size.height/2+50));
	MUISC = false;

	CCMenu *menu = CCMenu::create(image1, NULL);
	menu->setPosition(CCPointZero);
	this->addChild(menu);

	//上一步
	CCLabelTTF *labe2 = CCLabelTTF::create("Back:", "Helvetica", 20, ccp(100,20), kCCTextAlignmentLeft);
	labe2->setPosition(ccp(size.width/2-50, size.height/2));
	this->addChild(labe2);

	//上一步button
	image3 = CCMenuItemImage::create("backA.png", "backB.png", this, menu_selector(SetLayer::toback));
	image3->setPosition(ccp(size.width/2+30, size.height/2));
	image3->setScale(0.5f);

	CCMenu *menu2 = CCMenu::create(image3, NULL);
	menu2->setPosition(CCPointZero);
	this->addChild(menu2);

设置背景音乐，开关音乐图标的变化

void SetLayer:: tosetmusic(CCObject *pObj)
{
	  if (!MUISC)//禁音 ,off图标显示
	  {
			image1->setNormalImage(CCSprite::create("sound-off-A.png"));
			image1->setDisabledImage(CCSprite::create("sound-on-A.png"));
			CocosDenshion::SimpleAudioEngine::sharedEngine()->stopBackgroundMusic();
			MUISC = true;
			CCLOG("stop...");
	  }
	  else	//开启, on图标显示
	  {
		  image1->setNormalImage(CCSprite::create("sound-on-A.png"));
		  image1->setDisabledImage(CCSprite::create("sound-off-A.png"));
		  CocosDenshion::SimpleAudioEngine::sharedEngine()->playBackgroundMusic("background.mp3", true);
		  MUISC = false;
		  CCLOG("start...");
	  }
}

上一步切换至主菜单页面

void SetLayer::toback(CCObject *pObj)
{
	ssm->MenuScene();
}