Cocos2d-x实例：设置背景音乐与音效-HelloWorld场景实现

HelloWorld场景就是游戏中的主菜单场景。HelloWorld.h文件代码如下：

#define __HELLOWORLD_SCENE_H__#include "cocos2d.h"#include "SimpleAudioEngine.h"①#include "SettingScene.h"class HelloWorld : public cocos2d::Layer{public:static cocos2d::Scene* createScene();virtual bool init();  ②virtual void onEnter();virtual void onEnterTransitionDidFinish();virtual void onExit();virtual void onExitTransitionDidStart();virtual void cleanup();③void menuItemHelpCallback(cocos2d::Ref* pSender);void menuItemStartCallback(cocos2d::Ref* pSender);void menuItemSettingCallback(cocos2d::Ref* pSender);CREATE_FUNC(HelloWorld);};bool HelloWorld::init(){if ( !Layer::init() ){return false;}log("HelloWorld init");Size visibleSize = Director::getInstance()->getVisibleSize();Point origin = Director::getInstance()->getVisibleOrigin();Sprite *bg = Sprite::create("background.png");bg->setPosition(Point(origin.x + visibleSize.width/2,origin.y + visibleSize.height /2));this->addChild(bg);//开始精灵Sprite *startSpriteNormal = Sprite::create("start-up.png");Sprite *startSpriteSelected = Sprite::create("start-down.png");MenuItemSprite *startMenuItem = MenuItemSprite::create(startSpriteNormal, startSpriteSelected,CC_CALLBACK_1(HelloWorld::menuItemStartCallback, this));startMenuItem->setPosition(Director::getInstance()->convertToGL(Point(700, 170)));// 设置图片菜单MenuItemImage *settingMenuItem = MenuItemImage::create("setting-up.png","setting-down.png",CC_CALLBACK_1(HelloWorld::menuItemSettingCallback, this)); settingMenuItem->setPosition(Director::getInstance()->convertToGL(Point(480, 400)));// 帮助图片菜单MenuItemImage *helpMenuItem = MenuItemImage::create("help-up.png","help-down.png",CC_CALLBACK_1(HelloWorld::menuItemHelpCallback, this));helpMenuItem->setPosition(Director::getInstance()->convertToGL(Point(860, 480)));Menu* mu = Menu::create(startMenuItem, settingMenuItem, helpMenuItem, NULL);mu->setPosition(Point::ZERO);this->addChild(mu);return true;}void HelloWorld::menuItemSettingCallback(Ref* pSender){auto sc = Setting::createScene();auto reScene = TransitionJumpZoom::create(1.0f, sc);Director::getInstance()->pushScene(reScene);SimpleAudioEngine::getInstance()->playEffect("sound/Blip.wav");②}void HelloWorld::menuItemHelpCallback(Ref* pSender){MenuItem* item = (MenuItem*)pSender;log("Touch Help %p", item);SimpleAudioEngine::getInstance()->playEffect("sound/Blip.wav");③}void HelloWorld::menuItemStartCallback(Ref* pSender){MenuItem* item = (MenuItem*)pSender;log("Touch Start %p", item);SimpleAudioEngine::getInstance()->playEffect("sound/Blip.wav");④}void HelloWorld::onEnter(){Layer::onEnter();log("HelloWorld onEnter");}void HelloWorld::onEnterTransitionDidFinish(){Layer::onEnterTransitionDidFinish();log("HelloWorld onEnterTransitionDidFinish");//播放SimpleAudioEngine::getInstance()->playBackgroundMusic("sound/Jazz.mp3", true);⑤}void HelloWorld::onExit(){Layer::onExit();log("HelloWorld onExit");}void HelloWorld::onExitTransitionDidStart(){Layer::onExitTransitionDidStart();log("HelloWorld onExitTransitionDidStart");}void HelloWorld::cleanup(){Layer::cleanup();log("HelloWorld cleanup");//停止SimpleAudioEngine::getInstance()->stopBackgroundMusic("sound/Jazz.mp3");⑥}

上述代码第①行using namespace CocosDenshion是使用命名空间CocosDenshion，它是CocosDenshion引擎所需要的。代码②、③、④行SimpleAudioEngine::getInstance()->playEffect("sound/Blip.wav")是在点击菜单时候播放音效。第⑤行代码是onEnterTransitionDidFinish()函数中播放背景音乐。第⑥行代码是cleanup()函数中停止播放背景音乐。

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