virtual void registerWithTouchDispatcher();

	void ccTouchesBegan(cocos2d::CCSet *pTouches, cocos2d::CCEvent *pEvent);
	void ccTouchesMoved(cocos2d::CCSet *pTouches, cocos2d::CCEvent *pEvent);
	void ccTouchesEnded(cocos2d::CCSet *pTouches, cocos2d::CCEvent *pEvent);

void GameLevelLayer::registerWithTouchDispatcher()
{
	CCDirector* pDirector = CCDirector::sharedDirector();
	pDirector->getTouchDispatcher()->addStandardDelegate(this, 0); //注册多点触摸
}

void GameLevelLayer::ccTouchesBegan(cocos2d::CCSet *pTouches, cocos2d::CCEvent *pEvent)
{
	CCSetIterator iter = pTouches->begin();
	for (; iter!=pTouches->end(); iter++)
	{
		CCTouch* pTouch = (CCTouch*)(*iter);
		CCPoint touchLocation = this->convertTouchToNodeSpace(pTouch);  //把touch点地位转换为本地坐标
		if (touchLocation.x > 240)   //在屏幕最右边点，就是跳
		{
			_player->bMightAsWellJump = true;
		}
		else 
		{
			_player->bForwardMarch = true;
		}

	}
}

void GameLevelLayer::ccTouchesEnded(cocos2d::CCSet *pTouches, cocos2d::CCEvent *pEvent)
{
	
	_player->bForwardMarch = false; //松开按键时，设置为弗成跳也不是向前状况
	_player->bMightAsWellJump = false;
}

void Player::update(float delta)
{
	CCPoint gravity = ccp(0.f, -450.f);  //考拉每秒降低450个单位
	CCPoint gravityStep = ccpMult(gravity, delta); //计算在重力影响下delta时光内具体降低了若干， 即dt时光后下落速度为若干

	CCPoint forwardMove = ccp(800.f, 0.f); //进步速度，每秒进步800.f
	CCPoint forwardStep = ccpMult(forwardMove, delta);   // 1

	this->_velocity = ccpAdd(this->_velocity, gravityStep); //当前速度=当前速度+重力加快度
	this->_velocity = ccp(this->_velocity.x *0.9f, this->_velocity.y); //2
	
	if (this->bForwardMarch)
	{
		this->_velocity = ccpAdd(this->_velocity, forwardStep); //当前速度要加上向前的速度矢量
	}// 3

	CCPoint minMovement = ccp(-120.f, -350.f);
	CCPoint maxMovement = ccp(120.0f, 250.f);
	this->_velocity = ccpClamp(this->_velocity, minMovement, maxMovement); //4

	CCPoint stepVelocity = ccpMult(this->_velocity, delta); //计算下此速度下主角移动了若干

	this->_desiredPosition = ccpAdd(this->getPosition(), stepVelocity); //当前期望要去的地位=当前地位+当前速度
}

1. 当玩家触摸进步的时刻和重力模仿类似，我们加了一个向前的推动力800.f，处理方法与重力雷同
2. 第2步横向速度乘以0.9是模仿摩擦力效不雅，推敲下当有向前推力时玩家会向前移动，没有了呢？是不是急速停下来？那样看起来太生映了棘所以这里x轴速度每帧乘以0.9就起到了平均减速的效不雅，就像摩擦力一样
3. 检查一下玩家是否按了前，按进步时速度上就要加上向前的推动力，就起到了向进步的效不雅了
4. 这一步是调用了clamp是限制速度前后高低不要太大年夜，给它一个最大年夜值。之前的那句设定下落速度最大年夜值可以去掉落了。

if (tilePos.y > (_map->getMapSize().height-1))
{
	this->gameOver(false);
	return NULL;
}

CCPoint jumpForce = ccp(0.f, 310.f);

if(this->_mightAsWellJump && this->_onGround)
{
  this->_velocity = ccpAdd(this->_velocity, jumpForce);
}

CCPoint jumpForce = ccp(0.f, 310.f);  //向上的跳跃力 玩家一向按着跳跃键时的跳跃力
	float jumpCutOff = 150.f;   //玩家没有按住跳跃键时的跳跃力

	if(this->bMightAsWellJump && this->onGround)  //如不雅当前玩家按了跳跃键并且在地上
	{
		this->_velocity = ccpAdd(this->_velocity, jumpForce); //跳跃就是加上一个向上的速度
	}
	else if (!this->bMightAsWellJump && this->_velocity.y > jumpCutOff) //玩家没有按住跳跃键，并且向上的速度已经跨越了设定的值，就限制向上跳跃速度
	{
		this->_velocity = ccp(this->_velocity.x, jumpCutOff);
	}

void GameLevelLayer::setViewpointCenter(cocos2d::CCPoint pos)
{
	CCSize winSize = CCDirector::sharedDirector()->getWinSize();

	//限制角色不克不及跨越半屏
	int x = MAX(pos.x, winSize.width/2);
	int y = MAX(pos.y, winSize.height/2);

	//限制角色不克不及跑出屏幕
	x = MIN(x, (_map->getMapSize().width * _map->getTileSize().width) - winSize.width/2);
	y = MIN(y, (_map->getMapSize().height * _map->getTileSize().height) - winSize.height/2);

	CCPoint actualPosition = ccp(x, y);

	CCPoint centerOfView = ccp(winSize.width/2, winSize.height/2);
	CCPoint viewPoint = ccpSub(centerOfView, actualPosition);
	//设定一下地图的地位
	_map->setPosition(viewPoint);
}

void GameLevelLayer::handleHazardCollisions(Player* player)
{
	CCArray *tiles = this->getSurroundingTilesAtPosition(player->getPosition(), _hazards);
	CCDictionary* dic = NULL;
	CCObject* obj = NULL;
	float x=0.f; float y = 0.f;
	int gid = 0;
	CCARRAY_FOREACH(tiles, obj)
	{
		dic = (CCDictionary*)obj;
		x = dic->valueForKey("x")->floatValue();
		y = dic->valueForKey("y")->floatValue();
		CCRect tileRect = CCRectMake(x, y, _map->getTileSize().width, _map->getTileSize().height);
		CCRect pRect= player->collisionBoundingBox();

		gid = dic->valueForKey("gid")->intValue();
		if (gid && tileRect.intersectsRect(pRect))  //如不雅有钉刺并且玩家与它产生碰壮了棘gameOver
		{
			this->gameOver(false);
		}
	}
}

void GameLevelLayer::update(float delta)
{
	_player->update(delta);

	this->handleHazardCollisions(_player);
	
	this->checkForAndResolveCollisions(_player);
	this->setViewpointCenter(_player->getPosition());
}

void GameLevelLayer::gameOver(bool bWon)
{
	bGameOver = true;

	CCString* gameText;
	if (bWon)
	{
		gameText = CCString::create("You Won!");
	}
	else
		gameText = CCString::create("You have Died!");

	CCLabelTTF* diedLabel = CCLabelTTF::create(gameText->getCString(), "Marker Felt", 40);
	diedLabel->setPosition(ccp(240, 200));
	CCMoveBy *slideIn = CCMoveBy::create(1.f, ccp(0, 250));
	CCMenuItemImage* replay = CCMenuItemImage::create("replay.png","replay.png","replay.png", this, menu_selector(GameLevelLayer::restartGame));

	CCArray *menuItems = CCArray::create();
	menuItems->addObject(replay);
	CCMenu *menu = CCMenu::create();
	menu->addChild(replay);
	menu->setPosition(ccp(240, -100));

	this->addChild(menu);
	this->addChild(diedLabel);

	menu->runAction(slideIn);
}

void GameLevelLayer::update(float delta)
{
	if(bGameOver)
		return;

	_player->update(delta);

	this->handleHazardCollisions(_player);
	
	this->checkForAndResolveCollisions(_player);
	this->setViewpointCenter(_player->getPosition());
}

if (bGameOver) //可能玩家掉落坑里，就不处理了
	{
		return;
	}

void GameLevelLayer::checkForWin()
{
	if (_player->getPositionX()>3130.0)
	{
		this->gameOver(true);
	}
}

void GameLevelLayer::update(float delta)
{
	if(bGameOver)
		return;

	_player->update(delta);

	this->handleHazardCollisions(_player);
	this->checkForWin();
	this->checkForAndResolveCollisions(_player);
	this->setViewpointCenter(_player->getPosition());
}

void GameLevelLayer::gameOver(bool bWon)
{
	if (bGameOver)  //不要反复调用 
	{
		return;
	}
	bGameOver = true;
	SimpleAudioEngine::sharedEngine()->playEffect("hurt.wav");

if(this->bMightAsWellJump && this->onGround)  //如不雅当前玩家按了跳跃键并且在地上
	{
		this->_velocity = ccpAdd(this->_velocity, jumpForce); //跳跃就是加上一个向上的速度
		SimpleAudioEngine::sharedEngine()->playEffect("jump.wav");
	}