主菜单场景，主要实现进入游戏时的初始界面，它包括6个场景入口的菜单项：开始游戏，排行榜，帮助，设置，关于，退出
下面是MainLayer的头文件
#ifndef __MAIN_LAYER_H_
#define __MAIN_LAYER_H_
#include "cocos2d.h"
#include "GameSceneManager.h"
using namespace cocos2d;
class MainLayer :public Layer//主界面主要包含6个菜单项
{
public:
virtual bool init();
int randNum();//产生随机数的方法
void initSound();//加载游戏音效的方法
void menuCallBack0(Ref* pSender);//切换到选择游戏场景
void menuCallBack1(Ref* pSender);//切换到排行榜场景
void menuCallBack2(Ref* pSender);//切换到游戏设置场景
void menuCallBack3(Ref* pSender);//切换到游戏帮助场景
void menuCallBack4(Ref* pSender);//切换到游戏关于场景
void menuCallBack5(Ref* pSender);//退出游戏的菜单回调方法
void initTitle();//更新标题
CREATE_FUNC(MainLayer);
public:
Sprite* backGround;
NodeGrid* effectNode;//网格节点，用来实现3D水波涟漪特效
static bool musicFlag;
static bool soundFlag;
GameSceneManager* sceneManager;
};
#endif
MainLayer.cpp文件，其中文件中的某些菜单项，暂时没有实现其功能，后续补充修改。
#include "MainLayer.h"
#include "SimpleAudioEngine.h"
bool MainLayer::musicFlag = true;
bool MainLayer::soundFlag = true;
bool MainLayer::init()//主菜单界面的初始化
{
if (!Layer::init())
return false;
//设置随机种子，该方法基本可以实现真正的随机
timeval psv;
gettimeofday(&psv,nullptr);
unsigned long int seed = psv.tv_sec * 1000 + psv.tv_usec / 1000;
srand(seed);
auto visibleSize = Director::getInstance()->getVisibleSize();
auto origin = Director::getInstance()->getVisibleOrigin();
int n = randNum();//获取随机数（0-4），产生随机背景
if (n % 2 == 0)
backGround = Sprite::create("pic/morning.png");
else
backGround = Sprite::create("pic/night.png");
backGround->setAnchorPoint(Vec2(0,0));//设置背景锚点在左下角
backGround->setPosition(origin.x,origin.y + visibleSize.height - backGround->getContentSize().height);
this->addChild(backGround,0);
if (MainLayer::musicFlag)
CocosDenshion::SimpleAudioEngine::getInstance()->playBackgroundMusic("sounds/playscene.mp3",true);
auto floor = Sprite::create("pic/floor.png");
floor->setAnchorPoint(Vec2(0,0));
floor->setPosition(origin);
this->addChild(floor);
floor->runAction(RepeatForever::create(Sequence::create(Moveto::create(0.5f,Vec2(-120,0)),Moveto::create(0,Vec2(0,nullptr)));
//菜单项加载
auto menuItemStart = MenuItemImage::create("button/start.png","button/start_off.png",CC_CALLBACK_1(MainLayer::menuCallBack0,this));
menuItemStart->setPosition(Vec2(150,600));
auto menuItemRank = MenuItemImage::create("button/rank.png","button/rank_off.png",CC_CALLBACK_1(MainLayer::menuCallBack1,this));
menuItemRank->setPosition(Vec2(390,600));
auto menuItemSet = MenuItemImage::create("button/set.png","button/set_off.png",CC_CALLBACK_1(MainLayer::menuCallBack2,this));
menuItemSet->setPosition(Vec2(150,450));
auto menuItemHelp = MenuItemImage::create("button/help.png","button/help_off.png",CC_CALLBACK_1(MainLayer::menuCallBack3,this));
menuItemHelp->setPosition(Vec2(390,450));
auto menuItemAbout = MenuItemImage::create("button/about.png","button/about_off.png",CC_CALLBACK_1(MainLayer::menuCallBack4,this));
menuItemAbout->setPosition(Vec2(150,300));
auto menuItemExit = MenuItemImage::create("button/exit.png","button/exit_off.png",CC_CALLBACK_1(MainLayer::menuCallBack5,this));
menuItemExit->setPosition(Vec2(390,300));
auto mn = Menu::create(menuItemStart,menuItemRank,menuItemSet,menuItemHelp,menuItemAbout,menuItemExit,nullptr);
mn->setPosition(Vec2::ZERO);
this->addChild(mn,10);
effectNode = NodeGrid::create();
this->addChild(effectNode,10);//加入网格节点
auto title = Sprite::create("pic/title.png");
title->setPosition(Vec2(270,800));
effectNode->addChild(title);//将精灵添加到网格节点中
Director::getInstance()->setDepthTest(false);//关闭深度检测
effectNode->runAction(RepeatForever::create(Ripple3D::create(2.0f,Size(32,24),Vec2(270,800),360,4,5)));
return true;
}
int MainLayer::randNum()
{
int num = random(0,4);//根据产生的数，确定要加载的背景图片
return num;
}
void MainLayer::initTitle()
{
auto title = Sprite::create("pic/title.png");
title->setPosition(270,800);
this->addChild(title,10);
this->removeChild(effectNode);
}
void MainLayer::menuCallBack0(Ref* pSender)
{
}
void MainLayer::menuCallBack1(Ref* pSender)
{
initTitle();
sceneManager->goToRankBirdScene();
}
void MainLayer::menuCallBack2(Ref* pSender)
{
}
void MainLayer::menuCallBack3(Ref* pSender)
{
}
void MainLayer::menuCallBack4(Ref* pSender)
{
}
void MainLayer::menuCallBack5(Ref* pSender)
{
}
主菜单布景实现的效果图：