Cocos2D-x游戏开发之十：背景无限滚动

今天研究了一下Coco2D-x的背景无限滚动，其实是学习别人的demo，不过自己最终还是折腾出来了，其实还是比较简单了，就是背景不停地移动然后两张图片交替的贴上去。

其精髓之处就是不断地更新背景然后在每一帧里调整两张背景的\X锚点，然后就会给人一种主角再向前奔跑的感觉。核心代码如下：

bool TollgateScene::init()

{

bool bRet = false;

do

{

CC_BREAK_IF(! CCLayer::init());

CCSize size= CCDirector::sharedDirector()->getWinSize();

CCSprite* sprite = CCSprite::create("sprite.png");

//sprite->setPosition(ccp(size.width/2, size.height/2));

m_player = Player::createWithLayer(this);

m_player->BlindSprite(sprite);

this->addChild(m_player,2);

m_player->setPosition(ccp(size.width/2,size.height/2));

InitBG();

this->scheduleUpdate();

//schedule(schedule_selector(TollgateScene::update),1.0f);

} while (0);

return true;

}

int TollgateScene::InitBG(void)

{

m_sprite1 =CCSprite::create("tollgateBG.jpg");

m_sprite2=CCSprite::create("tollgateBG.jpg");

CCSize size= CCDirector::sharedDirector()->getWinSize();

m_sprite1->setPosition(ccp(size.width/2,size.height/2));

m_sprite2->setPosition(ccp(size.width+size.width/2,size.height/2));

m_sprite2->setFlipX(true);

this->addChild(m_sprite1,1);

this->addChild(m_sprite2,1);

return 0;

}

void TollgateScene::update(float delta)

{

int X1 = m_sprite1->getPositionX();

int X2 = m_sprite2->getPositionX();

int speed=2;

X1-=speed;

X2-=speed;

CCSize size = m_sprite1->getContentSize();

if (X1<-size.width/2)

{

X2 = size.width/2;

X1=size.width/2+size.width;

}

if (X2<-size.width/2)

{

X1 = size.width/2;

X2=size.width/2+size.width;

}

m_sprite1->setPositionX(X1);

m_sprite2->setPositionX(X2);

}