cocos2dx 示例 笔记

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首先是头文件，此笔记是整合在一起的， 不同类别用/*****/分开了

#ifndef __HELLOWORLD_SCENE_H__
#define __HELLOWORLD_SCENE_H__

#include "cocos2d.h"
//#include <cocos-ext.h>  //引入这玩意 需要在配置 C++ -- 常规 --包含引用目录后添加 $(EngineRoot) 使用tableView需要引入此头文件
#include <Box2D\Box2D.h> //Box2d head

//USING_NS_CC_EXT;  //使用tableview时引入
USING_NS_CC;
 
#define RATIO 80.0f

class HelloWorld : public cocos2d::Layer,public b2ContactListener //b2ContactListener Box2d碰撞检测    //,TableViewDataSource,TableViewDelegate //必须继承此类来实现TableView
{
/*private:
	LabelTTF *myLabel;*/
private:
	Size visibleSize;
	b2World *world;
	b2Body *groundBody;

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

    // Here's a difference. Method 'init' in cocos2d-x returns bool,instead of returning 'id' in cocos2d-iphone
    virtual bool init();

	//************ 物理引擎 *************/
	/*virtual void onEnter();
	void addEdges();
	void addBox(float x,float y);*/
	/***************分割线*********************/
    
    // a selector callback
    void menuCloseCallback(cocos2d::Ref* pSender);
    
    // implement the "static create()" method manually
    CREATE_FUNC(HelloWorld);
	/*********  计时器 *********/

	virtual void update(float dt);  //Box2d练习中也用到了此方法
	/**************** Box2d  ********************/
	virtual void addRect(float x,float y,b2BodyType type);
	void addGround();
	virtual void BeginContact(b2Contact* contact);

	/// Called when two fixtures cease to touch.
	virtual void EndContact(b2Contact* contact);

/*************** 以下均是为实现TableView声明的函数	*****************************************/
/*public:
    virtual Size cellSizeForTable(TableView *table);
    virtual TableViewCell* tableCellAtIndex(TableView *table,ssize_t idx);
    virtual ssize_t numberOfCellsInTableView(TableView *table);
public:
	virtual void tableCellTouched(TableView* table,TableViewCell* cell);

	virtual void scrollViewDidScroll(cocos2d::extension::ScrollView* view){};
   
	virtual void scrollViewDidZoom(cocos2d::extension::ScrollView* view) {};  **/
	/**************************TableView the End ***********************************/
};

#endif // __HELLOWORLD_SCENE_H__



具体实现

#include "HelloWorldScene.h"
//#include <tinyxml2/tinyxml2.h> //解析xml
//#include <json/document.h> //解析json
//#include <ui/CocosGUI.h>   //加载cocos studio所需头文件
//#include <cocostudio/CocoStudio.h>


USING_NS_CC;

//碰撞检测所用宏命令
/*
#define RED_BIT_MASK	0x0100
#define GREEN_BIT_MASK	0x0010
#define BLUE_BIT_MASK	0x0001
#define EDGE_BIT_MASK	0x1000*/


/****************************  以下是自定义TableView的实现函数 *****************************************/


/**
 **设置Table的尺寸 Size第二个参数是 每列的高度距离,第一个参数作用未知
 **/
/*Size HelloWorld::cellSizeForTable(cocos2d::extension::TableView *table){
	return Size(5,50);
}


TableViewCell* HelloWorld::tableCellAtIndex(cocos2d::extension::TableView *table,ssize_t idx){
	TableViewCell *cell = table->dequeueCell();
	//LabelTTF *label;
	Sprite * sprite;
	if(cell==NULL){
		cell = TableViewCell::create();
		sprite = Sprite::create("cell.jpg");
		sprite->setTag(2);
		sprite->setAnchorPoint(Point(0,0));//设置列 的锚点 不设置会显示不完整
		cell->addChild(sprite);
	}else{
		sprite =  (Sprite*)cell->getChildByTag(2);

	}
	//set data
	
	return cell;

}

ssize_t HelloWorld::numberOfCellsInTableView(cocos2d::extension::TableView *table){
	return 100;
} */

/************ Touched Event **************/  //点击TableView事件
/*void HelloWorld::tableCellTouched(cocos2d::extension::TableView *table,TableViewCell *cell){
	log("you touched!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!");
}  */
/**************************TableView 函数结束*******************************/




/*********************  cocos2dx物理引擎的使用  ****************************/
/*void HelloWorld::onEnter(){
	Layer::onEnter();
	addBox(visibleSize.width/2,visibleSize.height/2);//添加一个Box
	addEdges();
	CCLOG("init seccess");
	auto listener = EventListenerTouchOneByOne::create();//创建事件
	listener->onTouchBegan=[this](Touch *t,Event *event){//点击屏幕添加小球
		this->addBox(t->getLocation().x,t->getLocation().y);
		return false;
	};
	Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraPHPriority(listener,this);//启动事件侦听
	auto contactListener = EventListenerPhysicsContact::create();
	contactListener->onContactBegin=[](PhysicsContact & contact){ //盒子碰撞事件
		//碰撞检测
		switch(contact.getShapeA()->getBody()->getContactTestBitmask()|contact.getShapeB()->getBody()->getContactTestBitmask()){
			case RED_BIT_MASK|BLUE_BIT_MASK://红和蓝相撞
				log("red and blue");
				break;
			case RED_BIT_MASK|GREEN_BIT_MASK://红和绿相撞
				log("red and green");
				break;
			case BLUE_BIT_MASK|GREEN_BIT_MASK://蓝和绿相撞
				log("blue and green");
				break;
			case GREEN_BIT_MASK|EDGE_BIT_MASK://绿色盒子撞墙
				log("green hit edge");
				break;
			case RED_BIT_MASK|EDGE_BIT_MASK://红色盒子撞墙
				log("red hit edge");
				break;
			case BLUE_BIT_MASK|EDGE_BIT_MASK://蓝色盒子撞墙
				log("blue hit edge");
				break;
			case GREEN_BIT_MASK:
				log("tow green Box");
				break;
			case RED_BIT_MASK:
				log("tow red Box");
				break;
			case BLUE_BIT_MASK:
				log("tow blue Box");
				break;
			default:
				log("it's not collion");
				break;
		}
		return true; //必须return true否则物理碰撞效果会失效，因事件无法继续传播
	};
	Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraPHPriority(contactListener,this);
}

//添加物理碰撞边界
void HelloWorld::addEdges(){
	auto body = PhysicsBody::createEdgeBox(visibleSize,PHYSICSBODY_MATERIAL_DEFAULT,3);

	auto edgeShape = Node::create();
	edgeShape->setPhysicsBody(body);
	edgeShape->getPhysicsBody()->setContactTestBitmask(EDGE_BIT_MASK);
	edgeShape->setPosition(visibleSize.width/2,visibleSize.height/2);
	addChild(edgeShape);
}*/

//添加碰撞盒子
//void HelloWorld::addBox(float x,float y){
	/*auto ball = Sprite::create("ball.png");  //添加可碰撞的精灵
	ball->setPhysicsBody(PhysicsBody::createBox(ball->getContentSize()));//设置碰撞体积为图片本身大小
	ball->setPosition(x,y);
	addChild(ball);*/
	//添加碰撞盒子
	/*auto Box = Sprite::create();
	Box->setTextureRect(Rect(0,50,50));//设置盒子宽高
	Box->setPhysicsBody(PhysicsBody::createBox(Box->getContentSize()));//设置碰撞体积
	addChild(Box);
	Box->setPosition(x,y);
	switch(rand()%3){
	case 0:
		Box->setColor(Color3B(255,0));
		Box->getPhysicsBody()->setContactTestBitmask(RED_BIT_MASK);
		break;
	case 1:
		Box->setColor(Color3B(0,255,0));
		Box->getPhysicsBody()->setContactTestBitmask(GREEN_BIT_MASK);
		break;
	case 2:
		Box->setColor(Color3B(0,255));
		Box->getPhysicsBody()->setContactTestBitmask(BLUE_BIT_MASK);
		break;
	}
} */
/********************** 物理引擎结束分割线 ******************************/


Scene* HelloWorld::createScene()
{
    // 'scene' is an autorelease object
    auto scene = Scene::create();
	/*********************  cocos2dx物理引擎的使用  ****************************/
	/*auto scene = Scene::createWithPhysics(); //要使用物理引擎必须使用此初始化屏幕
	scene->getPhysicsWorld()->setDebugDrawMask(PhysicsWorld::DEBUGDRAW_ALL);
	scene->getPhysicsWorld()->setGravity(Vec2(0,-1000));//设置物体的掉落速度*/
	/***********物理引擎分割线******************/


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

    // add layer as a child to scene
    scene->addChild(layer);

    // return the scene
    return scene;
}


// on "init" you need to initialize your instance
bool HelloWorld::init()
{
    //////////////////////////////
    // 1. super init first
    if ( !Layer::init() )
    {
        return false;
    }
    
    visibleSize = Director::getInstance()->getVisibleSize();
    Vec2 origin = Director::getInstance()->getVisibleOrigin();

	//self code   show sprite
	//普通移动精灵
	/*auto sprite = Sprite::create("HelloWorld.png");
	sprite->setPosition(visibleSize/2);
	sprite->setPositionX(100);
	sprite->setScale(0.5); //缩放
	this->addChild(sprite);
	sprite->runAction(MoveTo::create(2,Vec2(visibleSize.width-100,visibleSize.height/2))); //移动action*/


	/********************  动作 ***************************/
	//顺序执行动作
	/*auto move1 = MoveTo::create(2,visibleSize.height/2));
	auto move2 = MoveBy::create(2,Vec2(-700,0));
	sprite->runAction(Sequence::create(move1,move2,NULL));*/
	//顺序执行动作方式2
	/*auto move1=MoveBy::create(2,Vec2(700,0));
	auto move2=move1->reverse();
	sprite->runAction(Sequence::create(move1,NULL));*/

	//并列执行动作
	/*auto move = MoveBy::create(2,0));
	auto scale = ScaleTo::create(2,1);
	//sprite->runAction(Spawn::create(move,scale,NULL));
	//动作执行完毕回调函数
	sprite->runAction(Sequence::create(Spawn::create(move,NULL),CallFunc::create([](){
		CCLOG("action complete");
	}),NULL));*/


	/******************************特效***************************************/
	//抖动特效
	/*auto role=NodeGrid::create();
	role->addChild(Sprite::create("HelloWorld.png"));
	role->setPosition(visibleSize/2);
	addChild(role);*/
	//抖动特效 参数1是抖动时间 参数3是抖动程度
	//role->runAction(Shaky3D::create(10,Size(50,50),5,false));
	//网格特效 size :切割50X50块  5：执行5秒
	//role->runAction(ShakyTiles3D::create(10,false));
	//爆炸特效  参数1是爆炸时间 其余未知
	//role->runAction(ShuffleTiles::create(1,5));
	//顺序执行先抖动再爆炸效果
	/*auto doudong = Shaky3D::create(1,10,false);
	auto baozha = ShuffleTiles::create(1,5);
	role->runAction(Sequence::create(doudong,baozha,NULL));*/
	//碎片消失效果
	//role->runAction(TurnOffTiles::create(1,25));
	//波纹效果
	//role->runAction(Waves3D::create(2,Size(15,10),40));
	//波纹效果执行完毕后恢复原来效果
	/*auto w1 = Waves3D::create(2,40);
	auto w2 = Waves3D::create(2,0);
	role->runAction(Sequence::create(w1,w2,NULL));*/

	/***************************************场景切换特效**************************************/
	/*auto background = Sprite::create("bg.jpg");
	background->setPosition(visibleSize/2);
	addChild(background);
	//创建文字
	/*LabelTTF *label = LabelTTF::create("more eat with the shit!Dou Bi Song!","Consolas",40);
	label->setPosition(visibleSize.width / 2,visibleSize.height / 2);
	addChild(label);*/

	/*scheduleOnce([visibleSize](float f){
		auto newScene = Scene::create();
		auto newBackground = Sprite::create("bg2.jpg");
		newBackground->setPosition(visibleSize/2);
		newScene->addChild(newBackground);
		//创建特效
		//auto t = TransitionCrossFade::create(1,newScene); //淡出切换效果
		//auto t = TransitionZoomFlipAngular::create(1,newScene);//反转特效
		//auto t = TransitionPageTurn::create(1,newScene,false);//翻页特效 true and false切换不同翻页特效
		//auto t = TransitionProgressRadialCW::create(1,newScene); //顺时针特效
		auto t = TransitionSplitRows::create(1,newScene);//拆分特效
		Director::getInstance()->replaceScene(t);//执行特效   
	},2,"Test");*/


	/*******************timer**************************************/
	//scene change
	/*scheduleOnce([visibleSize,this](float f){  //三秒后执行下列代码
		auto scene2 = Scene::create();
		auto scene2Layer = Layer::create();
		scene2->addChild(scene2Layer);
		auto logo = Sprite::create("HelloWorld.png");
		logo->setPosition(visibleSize/2);
		scene2Layer->addChild(logo);
		Director::getInstance()->replaceScene(scene2);
	},3,"testMethod");*/

	/**********************Vector*******************************/
	/*Vector<Label*> v;  //只能存放继承ref的对象
	auto label=Label::create();
	auto label2 =Label::create();
	label ->setString("label 1");
	label2->setString("label 2");
	label->setSystemFontSize(50);
	label2->setSystemFontSize(50);
	v.pushBack(label);
	v.pushBack(label2);
	int i = 0;
	for (auto l:v)
	{
		i++;
		l->setPosition(Vec2(visibleSize.width/2,i*200));
		addChild(l);
	}*/

	/*************************** Table View ***********************************/
	/*TableView *tableView = TableView::create(this,Size(200,350)); //Size的第二个参数是 table的高度,第一个参数是table宽度
	
   // tableView->setDirection(ScrollViewDirectionVertical);
	tableView->setAnchorPoint(Point(0,0));
    tableView->setPosition(400,0);//xy坐标
    tableView->setDelegate(this);
    //tableView->setVerticalFillOrder(TableViewFillTopDown);
    this->addChild(tableView);*/
   
	/********************   Animation 动画 **************************************/
	/*auto cache = SpriteFrameCache::getInstance();
	cache->addSpriteFramesWithFile("testFlash.plist");
	Vector<SpriteFrame*> v;
	char name[20];
	memset(name,15);//clear?;
	for (int i = 0; i < 15; i++)
	{
		sprintf(name,"testFlash%04d",i); //%04d 表示是数字且数字为4位 不够的用 0 填充
		v.pushBack(cache->getSpriteFrameByName(name));
	}
	Animation *animation = Animation::createWithSpriteFrames(v,0.1f); //0.1f是帧率
	Animate *animate = Animate::create(animation);
	auto sprite = Sprite::create();
	addChild(sprite);
	sprite->setPosition(500,300);
	sprite->runAction(RepeatForever::create(animate)); //运行循环特效*/

	
	/******************* 用户交互：触摸，按键... ***************************/
	/*auto label = LabelTTF::create("click me!","Courier",30);
	label->setPosition(visibleSize.width/2,visibleSize.height/2);

	addChild(label);
	auto listener = EventListenerTouchOneByOne::create(); //创建监听器
	listener->onTouchBegan = [](Touch *touch,Event *event){  //设置监听函数
		
		if(event->getCurrentTarget()->getBoundingBox().containsPoint(touch->getLocation())){ //判断点击范围是在label上
			log("onTouched!!!!!!!!!!!!");

		}
		return true;  //返回true才能出发事件传递
	};

	//事件传递
	listener->onTouchMoved = [](Touch* touch,Event *event){ //拖动事件   onTouchEnded = 触摸弹起事件
		log("onTouchmoved!");
		return true;//返回 true  才可以继续传递事件
	};

	Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraPHPriority(listener,label);  //绑定监听事件 */
	//多点触摸监听器******************************************
	/*auto listener = EventListenerTouchAllAtOnce::create();
	
	listener->onTouchesBegan = [](std::vector<Touch*> t,Event *event){ //单击事件
		log("onTouchesBegan");
	};
	listener->onTouchesMoved = [](std::vector<Touch*> t,Event *event){ //多点同时触摸事件
		log("touches moved,and touch count is%ld",t.size());
	};
	Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraPHPriority(listener,this); */


	/****************************  传感器  *****************************************/
	/*Device::setAccelerometerEnabled(true);//打开传感器侦听  传感器=重力感应？
	auto listener = EventListenerAcceleration::create([](Acceleration *a,Event *event){
		log("x:%g,y:%g,z:%g",a->x,a->y,a->z);
	});
	Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraPHPriority(listener,this);*/

	/**************************  按键监听  ************************************/
	/*auto listener = EventListenerKeyboard::create();
	listener->onKeyReleased = [](EventKeyboard::KeyCode code,Event *venet){ //监听按键事件
		log("key:%d",code);
		switch(code){  
		case EventKeyboard::KeyCode::KEY_BACKSPACE: //如果是后退键
			Director::getInstance()->end();   //退出当前程序
				break;
		}
	};

	Director::getInstance()->getEventDispatcher()->addEventListenerWithSceneGraPHPriority(listener,this);*/


	/********  计时器 ****************/
	/*myLabel = LabelTTF::create("hello world",30);
	addChild(myLabel);
	scheduleUpdate();//启动计时器？？*/

	/**********  首选项数据存储 **************/
	/*UserDefault::getInstance()->setStringForKey("value","i'm is value");
	log(UserDefault::getInstance()->getStringForKey("value","not value!").c_str());//第二个参数是默认值*/

	/**************  cocos2dx文件读写 *****************************/
	//auto fu = FileUtils::getInstance();
	/*FILE *file = fopen(fu->fullPathFromRelativeFile("data.txt",fu->getWritablePath()).c_str(),"w"); //写入文件
	fprintf(file,"Hello world\n");
	log(fu->getWritablePath().c_str());
	fclose(file);*/
	/*Data data = fu->getDataFromFile(fu->fullPathFromRelativeFile("data.txt",fu->getWritablePath()));
	log("%s",data.getBytes());*/
	//*****************plist 文件操作
	/*ValueMap map = fu->getValueMapFromFile("testFlash.plist");
	log("value is:%s",map["frames"].asString().c_str());*/

	/*******************  cocos2d的XML文件操作 ****************************/
	/*auto document = new tinyxml2::XMLDocument();
	document->Parse(fu->getStringFromFile("data.xml").c_str());
	auto root = document->RootElement();
	log("parse xml begin");
	for (auto e = root->FirstChildElement(); e; e=e->NextSiblingElement())
	{
		std::string str;
		log("node name is:%s",e->Value());
		for (auto attr = e->FirstChildElement();attr;attr=attr->NextSiblingElement())
		{
			str+=attr->Name();  //节点名称
			str+=":";
			str+=attr->GetText(); //节点值
			str+="\n";
		}
		log("%s",str.c_str());
	}*/

	//***********************  解析json数据   ************************************/
	/*rapidjson::Document d;
	d.Parse<0>(FileUtils::getInstance()->getStringFromFile("jsonName.json").c_str());

	log("%s",d.[(int)0]["name"]);//获取json的name属性值*/


	/*****************  加载TMX地图 *****************************/
	/*auto map = TMXTiledMap::create("map.tmx");
	addChild(map);

	auto p = map->getProperties();
	auto str = p["type"].asString();
	log("map attr:%s",str);

	//获取图层属性
	auto l = map->getLayer("scane");
	auto lp = l->getProperties();
	log("layer attr:%s",lp["type"].asString().c_str());

	//获取图块属性
	auto tile = map->propertiesForGID(1).asValueMap();
	log("tile attr:%s",tile["type"].asString().c_str());

	//对象属性
	auto o = map->getObjectGroup("object");
	auto obj = o->getObject("player");
	log("object attr:%s",obj["type"].asString().c_str()); //获取palyer出生点同理

	//修改指定区域颜色
	auto co = o->getObject("color");
	auto x = co["x"].asInt()/32;
	auto y = co["y"].asInt()/32;
	auto w = co["width"].asInt()/32;
	auto h = co["height"].asInt()/32;//why /32
	for (int i = x; i < x+w; i++)
	{
		for (int j = y; j < y+h; j++)
		{
			auto sprite = l->getTileAt(Vec2(i,map->getMapSize().height-j)); //tile map 的x Y轴是相反的
			sprite->setColor(Color3B(255,0));
		}
	}

	Sprite *player = Sprite::create("player.png");
	player->setPosition(obj["x"].asFloat(),obj["y"].asFloat());
	addChild(player);

	auto eventListener = EventListenerTouchOneByOne::create();
	eventListener->onTouchBegan = [map,l,player](Touch *touch,Event *event){  //添加点击事件来模拟玩家移动
		auto point = map->convertToNodeSpace(touch->getLocation()); //获得点击的位置
		point.x = static_cast<int>(point.x/32); //点击的位置感觉有偏差 可能是tilemap没画好
		point.y = map->getMapSize().height-static_cast<int>(point.y/32)-1;
		auto t  = l->getTileAt(point);
		//t->setColor(Color3B(255,0));

		auto gid = l->getTileGIDAt(point);  //获取GID
		auto p = map->getPropertiesForGID(gid).asValueMap();
		if(!p["move"].isNull()&&p["move"].asBool()){  //判断点击位置是否在可移动范围内
			player->setPosition(t->getPosition().x,t->getPosition().y);//将player移动到点击的位置
		}
		return false;
	};
	//注册侦听事件
	_eventDispatcher->addEventListenerWithSceneGraPHPriority(eventListener,map);*/


	/*********************  cocos studio 加载 ***********************/
	/*auto node = CSLoader::createNode("MainMenu.csb");
	addChild(node);*/
	//获取容器示例
	//auto pageView = node->getChildByName<ui::PageView>("PageView");

	//序列化框架：FlatBuffers 

	//使用plist载入cocos studio。
	/*SpriteFrameCache::getInstance()->addSpriteFramesWithFile("Plist.plist");//如使用资源文件 则不需要此行代码

	//翻页容器示例
	auto levelSelection = CSLoader::createNode("Layer.csb");
	addChild(levelSelection);
	//获取翻页容器
	auto pageView = levelSelection->getChildByName<ui::PageView*>("PageView_SelectPage");
	//左按钮
	auto leftButton = levelSelection->getChildByName<ui::Button*>("Button_Left");
	auto rightButton = levelSelection->getChildByName<ui::Button*>("Button_Right");
	//获得Label控件
	//auto levelNumber = levelSelection->getChildByName<ui::TextAtlas*>("LabelAtlas_CurrentScene");//不知为何拿不到该控件
	log("lode complete");
	//添加滑动监听事件
	pageView->addEventListener([pageView](Ref* ref,ui::PageView::EventType type){
		if(type==ui::PageView::EventType::TURNING){
			//levelNumber->setString(StringUtils::format("%zd/3",pageView->getCurPageIndex()+1));//滑动修改label控件显示的字符串
		}
	});

	//按钮事件
	leftButton->addClickEventListener([pageView](Ref* ref){
		auto index = pageView->getCurPageIndex();
		index--;
		if(index<0){
			return;
		}
		pageView->scrollToPage(index);
	});
	rightButton->addClickEventListener([pageView](Ref* ref){
		auto index = pageView->getCurPageIndex();
		index++;
		if(index>3){
			return;
		}
		pageView->scrollToPage(index);
	}); */

	//**********加载cocos studio动画
	/*auto rootNode = CSLoader::createNode("AnimationScene.csb");
	rootNode->setPosition(visibleSize/8);//本来应该是/2居中的 可能应为窗口大小原因位置不正确
	addChild(rootNode);
	auto timeLine = CSLoader::createTimeline("AnimationScene.csb");
	timeLine->gotoFrameAndPlay(0,45+1,true);//设置播放方式  如不设置从多少帧到多少帧则无法监听到最后一帧的事件（不知为何。。）; true表示循环播放,必须最后一帧+1才能完整监听所有事件，不知为何。。
	rootNode->runAction(timeLine);

	//监听动画的帧事件
	timeLine->setFrameEventCallFunc([](cocostudio::timeline::Frame* frame){
		auto event = dynamic_cast<cocostudio::timeline::EventFrame*>(frame);
		if(event!=nullptr){ //如果当前帧不为空
			CCLOG("%s",event->getEvent().c_str()); //输出当前帧名称
		}
	});*/
	/********************** cocos studio the end  ************************/


/***************************************  Box2D  **************************************************/
	world = new b2World(b2Vec2(0,-10)); //创建Box2d物理世界  参数分别是x y轴的重力  y 轴-10 表示往下掉落 速度为10
	world->SetContactListener(this);
	addRect(5,b2_dynamicBody);   //b2_dynamicBody 动态物体  b2_staticBody静态物体  b2_kinematicBody漂浮物体
	addGround();
	scheduleUpdate();
    return true;
}

/********  计时器练习 和 Box2d练习 ****************/
void HelloWorld::update(float dt){
	//myLabel->setPosition(myLabel->getPosition()+Point(1,1));  //计时器
	/*************  Box2d  **************/
	world->Step(dt,8,3);
	Sprite *s;
	for (b2Body *b = world->GetBodyList(); b; b = b->GetNext()){
		if (b->GetUserData()){
			s = (Sprite*)b->GetUserData();
			s->setPosition(b->GetPosition().x*RATIO,b->GetPosition().y*RATIO);//每次渲染都让sprite与Box body保持位置绑定
		}
	}
}

/******************************* Box2d练习 *************************/
void HelloWorld::addRect(float x,b2BodyType type){
	b2BodyDef def;
	def.position = b2Vec2(x,y);
	def.linearVelocity = b2Vec2(0,10);//运动物体  第一个参数是x轴  第二个参数是y轴 必须是漂浮物体或者动态物体
	
	def.type = type;//b2_dynamicBody 是动态物体（枚举）
	b2Body *body = world->CreateBody(&def);

	b2PolygonShape shape;
	shape.SetAsBox(0.5,0.5);

	b2FixtureDef fixtureDef;
	fixtureDef.density = 1;
	fixtureDef.friction = 0.3;
	fixtureDef.shape = &shape;
	body->CreateFixture(&fixtureDef);

	//创建盒子图像以显示物理下落效果
	auto sprite = Sprite::create();
	sprite->setTextureRect(Rect(0,0.5*2*RATIO,0.5*2*RATIO));
	addChild(sprite);

	sprite->setPosition(Point(def.position.x*RATIO,def.position.y*RATIO));//物理物体会自动往下掉 因此绑定物理物体的位置到sprite上 就形成了物理
	body->SetUserData(sprite);//body与sprite图形绑定
}

void HelloWorld::addGround(){
	b2BodyDef def;
	def.position = b2Vec2(400/RATIO,0);
	def.type = b2_staticBody;//设置类型为静态物体
	
	groundBody = world->CreateBody(&def);
	b2PolygonShape groundShape;
	groundShape.SetAsBox(400/RATIO,0.5);
	b2FixtureDef fixureDef;
	fixureDef.density = 1;
	fixureDef.friction = 0.3;
	fixureDef.shape = &groundShape;
	groundBody->CreateFixture(&fixureDef);

}


void HelloWorld::BeginContact(b2Contact* contact) {
	
	if (contact->GetFixtureA()->GetBody() == groundBody || contact->GetFixtureB()->GetBody() == groundBody){
		log("floor touched");
	}
}


void HelloWorld::EndContact(b2Contact* contact) { B2_NOT_USED(contact); }


void HelloWorld::menuCloseCallback(Ref* pSender)
{
    Director::getInstance()->end();

#if (CC_TARGET_PLATFORM == CC_PLATFORM_IOS)
    exit(0);
#endif
}

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