Cocos2d 之FlyBird开发---MainMenu类

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　　MainMenu类主要实现的是游戏主界面的布局，它相当于一个港口，有开向各处的航道，而游戏中的MainMenu则是有跳转到各个场景的一个集合点。

　　下面贴上代码：

MainMenu.h

#ifndef _MAIN_MENU_H_
#define _MAIN_MENU_H_

////////////////////////////////////////////////////////////////
//            这里主要的是实现主界面的一些操作
#include "cocos2d.h"
USING_NS_CC;

class MainMenu : public cocos2d::Layer
{
private:
     cocos2d::Sprite* background;
     cocos2d::MenuItemImage* playItem;
     cocos2d::MenuItemImage* scoreItem;
     cocos2d::MenuItemImage* aboutItem;
     cocos2d::MenuItemImage* exitItem;
     cocos2d::Sprite* logo;
     cocos2d::Sprite* bird;
     cocos2d::Sprite* land;
public:
     static cocos2d::Scene* createScene();
     virtual bool init();
     void interfaceLayout();
     void goPlay(cocos2d::Ref*);
     void goScore(cocos2d::Ref*);
     void goAbout(cocos2d::Ref*);
     void goExit();
     CREATE_FUNC(MainMenu);
};

#endif // _MAIN_MENU_H_

MainMenu.cpp

#include "MainMenu.h"
#include "GameUnit.h"
#include "GameAbout.h"
#include "GameScore.h"
#include "GamePlay.h"
#include "GameData.h"

unit u;

//创建一个游戏场景
cocos2d::Scene* MainMenu::createScene()
{
     auto scene = Scene::create();
     auto layer = MainMenu::create();
     scene->addChild(layer);
     return scene;
}

//初始化
bool MainMenu::init()
{
     if (!Layer::init())
     {
              return false;
     }

     //设置主界面的背景音乐

     //初始化游戏数据
     if (!GameData::getGameData())
     {
              GameData::initGameData();
     }
     //布局主界面
     this->interfaceLayout();

     return true;
}

//游戏界面布局
void MainMenu::interfaceLayout()
{
     //1: add background
     background = Sprite::create("background/light.png");
     background->setPosition(Vec2(u.winOrigin().x + u.winSize().width / 2,
              u.winOrigin().y + u.winSize().height / 2));
     background->setScale(u.scaleX(background, u.winSize()),
              u.scaleY(background, u.winSize()));
     this->addChild(background, 0);

     //2: add FlyBird logo
     logo = Sprite::create("logo/title.png");
     logo->setPosition(Vec2(u.winOrigin().x + u.winSize().width / 2,
              u.winOrigin().y + u.winSize().height - 2 * logo->getContentSize().height));
     logo->setScale(1.5);
     this->addChild(logo, 1);

     //3: add wall
     land = Sprite::create("background/land.png");
     land->setPosition(Vec2(u.winOrigin().x + u.winSize().width / 2,
              u.winOrigin().y + land->getContentSize().height / 2));
     land->setScaleX(u.winSize().width / 1.5*land->getContentSize().width);
     //land->setScaleY(1.5*u3.winSize().height / backgroundA->getContentSize().height);
     land->setScaleY(u.winSize().height / (land->getContentSize().height * 3));
     this->addChild(land);

     //4: add bird animation
     bird = Sprite::create("bird/littleBird.png");
     bird->setPosition(Vec2(u.winOrigin().x + u.winSize().width / 2,
              u.winOrigin().y + (u.winSize().height / 3) * 2));
     bird->setScale(2);
     auto repeat = RepeatForever::create(Animate::create(u.gameAnimate(1)));
     bird->runAction(repeat);
     this->addChild(bird);

     //5: add about button
     aboutItem = MenuItemImage::create(
              "button/about.png",
              "button/buttom.png",
              CC_CALLBACK_1(MainMenu::goAbout, this));
     aboutItem->setPosition(Vec2(u.winOrigin().x + u.winSize().width - aboutItem->getContentSize().width / 2,
              u.winOrigin().y + aboutItem->getContentSize().height / 2));
     auto m = Menu::create(aboutItem, NULL);
     m->setPosition(Vec2::ZERO);
     this->addChild(m, 2);

     //6: add play button
     playItem = MenuItemImage::create(
              "button/play.png",
              "button/play.png",
              CC_CALLBACK_1(MainMenu::goPlay, this)
              );

     //7: add score button
     scoreItem = MenuItemImage::create(
              "button/score.png",
              "button/score.png",
              CC_CALLBACK_1(MainMenu::goScore, this)
              );

     auto menu = Menu::create(playItem, scoreItem, NULL);
     menu->alignItemsHorizontallyWithPadding(10);
     menu->setPosition(u.winOrigin().x + u.winSize().width - menu->getContentSize().width/4,
              u.winOrigin().y + 1.7*menu->getContentSize().height/3);
     menu->setScale(1.5);
     this->addChild(menu, 2);

     //exit
     exitItem = MenuItemImage::create(
              "button/exit_f.png",
              "button/exit_b.png",
              CC_CALLBACK_0(MainMenu::goExit, this)
              );
     Menu* exitMenu = Menu::create(exitItem, NULL);
     exitMenu->setPosition(Vec2(u.winOrigin().x + exitItem->getContentSize().width / 2,
              u.winOrigin().y + exitItem->getContentSize().height / 2));
     this->addChild(exitMenu, 7);
}

void MainMenu::goPlay(cocos2d::Ref* pSender)
{
     Director::getInstance()->replaceScene(TransitionFadeTR::create(1,
              GamePlay::createScene()));
}

void MainMenu::goScore(cocos2d::Ref* pSender)
{
     Director::getInstance()->replaceScene(TransitionFadeTR::create(1,
              GameScore::createScene()));
}

void MainMenu::goAbout(cocos2d::Ref* pSender)
{
     Director::getInstance()->replaceScene(TransitionFadeTR::create(1,
              GameAbout::createScene()));
}

void MainMenu::goExit()
{
     Director::getInstance()->end();
}

每个函数的功能见：Cocos2d之FlyBird开发---简介

效果图：