编写小游戏《贪头蛇》第二篇

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

该篇主要实现四个菜单按钮回调功能，切换到对应场景

关于页面

代码：

SnakeSceneManager类管理所有场景切换，只需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("\tSnake is a classic mobile phone game, \n\simple and resistance to play.By \n\controlling the direction of the \n\snake eating the eggs that snake \n\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);//返回主菜单按钮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);//音乐设置按钮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);//上一步按钮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();}