Cocos2d-x FlappyBird

HelloWorldScene.cpp

 #include "HelloWorldScene.h"

 USING_NS_CC;

 CCScene* HelloWorld::scene()
 {
     // 'scene' is an autorelease object
     CCScene *scene = CCScene::create();

     // 'layer' is an autorelease object
     HelloWorld *layer = HelloWorld::create();

     //添加一个背景颜色图层
     CCSize s = CCDirector::sharedDirector()->getWinSize();

     CCLayer *colorlayer = CCLayerColor::create(ccc4(0x00, 0xff, 0xff, 0xff), s.width, s.height);

     colorlayer->ignoreAnchorPointForPosition(false);

     colorlayer->setPosition(s.width / , s.height / );

     scene->addChild(colorlayer, , colorlayer->getTag());

     // add layer as a child to scene
     //将主图层添加都背景图层中
     colorlayer->addChild(layer);

     // return the scene
     return scene;
 }

 // on "init" you need to initialize your instance
 bool HelloWorld::init()
 {
     //////////////////////////////
     // 1. super init first
     if ( !CCLayer::init() )
     {
         return false;
     }

     //取得屏幕的大小
     screenSize = CCDirector::sharedDirector()->getVisibleSize();

     //初始化世界
     initWorld();

     //添加小鸟、障碍物容器及地面
     addBird();
     addBarContainer();
     addGround();

     //每隔一秒添加一组障碍物
     scheduleUpdate();
     schedule(schedule_selector(HelloWorld::addBar), 1.0f);

     //设置允许触摸
     setTouchEnabled(true);

     return true;
 }

 void HelloWorld::initWorld()
 {
     //重力加速度：纵向9.8，横向 0
     world = new b2World(b2Vec2(, -9.8f));
     //添加监视
     world->SetContactListener(this);
 }

 void HelloWorld::startGame(float dt){
     scheduleUpdate();
     schedule(schedule_selector(HelloWorld::addBar), );
 }

 void HelloWorld::stopGame(){
     unscheduleUpdate();
     unschedule(schedule_selector(HelloWorld::addBar));
 }

 void HelloWorld::addBird()
 {
     bird = B2Sprite::create("bird.png");
     CCSize size = bird->getContentSize();

     //添加小鸟
     b2BodyDef bodyDef;
     bodyDef.type = b2_dynamicBody;
     bodyDef.position = b2Vec2(screenSize.width//RATIO, screenSize.height//RATIO);
     b2Body * birdBody = world->CreateBody(&bodyDef);

     //设置边界
     b2PolygonShape birdShape;
     birdShape.SetAsBox(size.width//RATIO, size.height//RATIO);

     //碰撞
     b2FixtureDef birdFixtureDef;
     birdFixtureDef.shape= &birdShape;
     birdBody->CreateFixture(&birdFixtureDef);

     bird->setPTMRatio(RATIO);
     bird->setB2Body(birdBody);
     addChild(bird);
 }

 void HelloWorld::addBar(float dt)
 {
     float offset = -rand()%;

     //downbar
     B2Sprite *downBar = B2Sprite::create("down_bar.png");
     CCSize downBarSize = downBar->getContentSize();

     b2BodyDef downBarBodyDef;
     downBarBodyDef.type = b2_kinematicBody;
     downBarBodyDef.position = b2Vec2(screenSize.width/RATIO + , downBarSize.height/RATIO/ + offset);
     downBarBodyDef.linearVelocity = b2Vec2(-5.0f, );

     b2PolygonShape downBarShape;
     downBarShape.SetAsBox(downBarSize.width/RATIO/, downBarSize.height/RATIO/);

     b2FixtureDef downBarFixtureDef;
     downBarFixtureDef.shape = &downBarShape;

     b2Body *downBarBody = world->CreateBody(&downBarBodyDef);
     downBarBody->CreateFixture(&downBarFixtureDef);

     downBar->setB2Body(downBarBody);
     downBar->setPTMRatio(RATIO);

     //upbar
     B2Sprite *upBar = B2Sprite::create("up_bar.png");
     CCSize upBarSize = upBar->getContentSize();

     b2BodyDef upBarBodyDef;
     upBarBodyDef.type = b2_kinematicBody;
     upBarBodyDef.position = b2Vec2(screenSize.width/RATIO + , upBarSize.height/RATIO/ + offset + downBarSize.height/RATIO + 2.5f);
     upBarBodyDef.linearVelocity = b2Vec2(-, );

     b2PolygonShape upBarShape;
     upBarShape.SetAsBox(upBarSize.width/RATIO/, upBarSize.height/RATIO/);

     b2FixtureDef upBarFixtureDef;
     upBarFixtureDef.shape = &upBarShape;

     b2Body *upBarBody = world->CreateBody(&upBarBodyDef);
     upBarBody->CreateFixture(&upBarFixtureDef);

     upBar->setB2Body(upBarBody);
     upBar->setPTMRatio(RATIO);

     barContainer->addChild(upBar);
     barContainer->addChild(downBar);
 }

 void HelloWorld::addBarContainer()
 {
     //将所有的障碍物包裹在一个容器中
     barContainer = CCSprite::create();
     addChild(barContainer);
 }

 void HelloWorld::addGround()
 {
     B2Sprite *ground = B2Sprite::create("ground.png");
     CCSize size = ground->getContentSize();

     b2BodyDef bDef;
     bDef.type = b2_staticBody;
     bDef.position = b2Vec2(size.width//RATIO, size.height//RATIO);
     b2Body *groundBody = world->CreateBody(&bDef);

     b2PolygonShape groundShape;
     groundShape.SetAsBox(size.width//RATIO, size.height//RATIO);

     b2FixtureDef groundFixtureDef;
     groundFixtureDef.shape = &groundShape;
     groundBody->CreateFixture(&groundFixtureDef);

     ground->setPTMRatio(RATIO);
     ground->setB2Body(groundBody);
     addChild(ground);
 }

 void HelloWorld::update(float dt)
 {
     world->Step(dt, , );

     CCSprite *sprite;

     //取得世界中的所有的body
     b2Body *node = world->GetBodyList();

     //遍历世界中的body
     while(node)
     {
         b2Body *body = node;
         node = node->GetNext();
         sprite = (CCSprite*)body->GetUserData();

         //超出屏幕左边界，销毁
         if (body->GetPosition().x < -)
         {
             if (sprite != NULL)
             {
                 //在屏幕上清除
                 sprite->removeFromParent();
             }
             //在内存中销毁
             world->DestroyBody(body);
         }
     }
 }

 void HelloWorld::BeginContact(b2Contact *contact){
     //碰撞检测，有一个为鸟游戏就结束
     if (contact->GetFixtureA()->GetBody()->GetUserData()==bird || contact->GetFixtureB()->GetBody()->GetUserData()==bird)
     {
         //游戏结束，弹出dialog
         stopGame();
         CCMessageBox("Game Over", "Alert");
     }
 }

 void HelloWorld::ccTouchesBegan(CCSet *pTouches, CCEvent *pEvent)
 {
     //触碰屏幕时，小鸟向上运动，重力加速度：纵向 5，横向 0
     bird->getB2Body()->SetLinearVelocity(b2Vec2(, 5.0f));
 }

 void HelloWorld::menuCloseCallback(CCObject* pSender)
 {
 #if (CC_TARGET_PLATFORM == CC_PLATFORM_WINRT) || (CC_TARGET_PLATFORM == CC_PLATFORM_WP8)
     CCMessageBox("You pressed the close button. Windows Store Apps do not implement a close button.","Alert");
 #else
     CCDirector::sharedDirector()->end();
 #if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
     exit();
 #endif
 #endif
 }

HelloWorldScene.h

 #ifndef __HELLOWORLD_SCENE_H__
 #define __HELLOWORLD_SCENE_H__

 #include "cocos2d.h"
 #include "Box2D\Box2D.h"
 #include "B2Sprite.h"

 #define RATIO 72.0f

 class HelloWorld : public cocos2d::CCLayer,public b2ContactListener
 {
 public:
     // Here's a difference. Method 'init' in cocos2d-x returns bool, instead of returning 'id' in cocos2d-iphone
     virtual bool init();  

     // there's no 'id' in cpp, so we recommend returning the class instance pointer
     static cocos2d::CCScene* scene();

     // a selector callback
     void menuCloseCallback(CCObject* pSender);

     // implement the "static node()" method manually
     CREATE_FUNC(HelloWorld);

     virtual void ccTouchesBegan(CCSet *pTouches, CCEvent *pEvent);
     virtual void BeginContact(b2Contact* contact);

     virtual void update(float dt);

     b2World *world;
     B2Sprite *bird;

     CCSize screenSize;

     CCSprite *barContainer;

 private:
     void addBird();
     void addGround();
     void initWorld();
     void addBar(float dt);
     void addBarContainer();
     void startGame(float dt);
     void stopGame();
 };

 #endif // __HELLOWORLD_SCENE_H__