cocos2d-x 3.2 移动游戏背景和精灵

概述1，先新增监听事件 auto listener = EventListenerTouchOneByOne::create(); listener->setSwallowTouches(true); listener->onTouchBegan = CC_CALLBACK_2(StartGame::onTouchBegan, this); listener->onTouchMoved = CC

1，先新增监听事件

auto Listener = EventListenertouchOneByOne::create();	Listener->setSwallowtouches(true);	Listener->ontouchBegan = CC_CALLBACK_2(StartGame::ontouchBegan,this);	Listener->ontouchmoved = CC_CALLBACK_2(StartGame::ontouchmoved,this);	Listener->ontouchended = CC_CALLBACK_2(StartGame::ontouchended,this);	_eventdispatcher->addEventListenerWithSceneGraPHPriority(Listener,this);

2，监听的方法回调函数实现

bool StartGame::ontouchBegan(touch* touch,Event* event){    Point touchLocation = this->converttouchToNodeSpace(touch);    this->selectSpriteFortouch(touchLocation);    return true;}voID StartGame::ontouchmoved(touch* touch,Event* event){	Point touchLocation = this->converttouchToNodeSpace(touch);    Point oldtouchLocation = touch->getPrevIoUsLocation();    oldtouchLocation = this->convertToNodeSpace(oldtouchLocation);    Point translation = touchLocation - oldtouchLocation;//获取移动的距离	cclog("touchLocation--------------------%d-------%d",touchLocation.x,touchLocation.y);	cclog("oldtouchLocation--------------------%d-------%d",oldtouchLocation.x,oldtouchLocation.y);	cclog("translation--------------------%d-------%d",translation.x,translation.y);	    this->boundLayerPos(translation);//背景移动函数

    //this->panForTranslation(translation);//精灵移动函数}voID StartGame::ontouchended(touch* touch,Event* event){}

3，方法实现

这个事背景事件，在init里面加载一张背景图片

voID StartGame::boundLayerPos(Point newtouch){    Size winSize = Director::getInstance()->getWinSize();	Point newPos = this->getposition() + newtouch;	auto map = getChildByTag(102); //这里获取背景图片    newPos.x = MIN(newPos.x,0);    newPos.x = MAX(newPos.x,-map->getContentSize().wIDth+winSize.wIDth);    newPos.y = MIN(newPos.y,0);	newPos.y = MAX(newPos.y,-map->getContentSize().height + winSize.height);    this->setposition(newPos);}

精灵移动方法实现

在init里面加载一个精灵

voID StartGame::panForTranslation(Point translation){	auto sprite = getChildByTag(101);//获取精灵    Point newPos = sprite->getposition() + translation;    sprite->setposition(newPos);    }

这就ok了

精灵或者是背景图片移动都是在触屏监听事件的ontouchmoved(touch* touch,Event * event)里面获取原触屏点和移动以后的触屏点，得到他们的差值，给精灵或者背景图片重新定位setposition(Point * point),就完成了背景和精灵的移动（背景图片要判断边界值得）

注意，Node可通过函数getBoundingBox返回精灵的边界矩形。这比你自己手动计算精灵的边界矩形要好多了。因为，第一，它更简单;第二，它考虑了精灵的位置坐标变换。（比如锚点变了，要执行相应的矩阵变换，具体可以参考源代码，这些就不再细说了。）

点击选中的时候可以先让精灵做一些动作，这里是闪烁

voID StartGame::selectSpriteFortouch(Point touchLocation){	auto sprite = getChildByTag(101);       if ( sprite->getBoundingBox().containsPoint(touchLocation) )    {            auto blink = CCBlink::create(2.0f,5);			sprite->runAction(blink);    }      }

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