cocos2dx 背景无限滚动

#include "BaseLayer.h"

BaseLayer::BaseLayer()
{
}

BaseLayer::~BaseLayer()
{
}
bool BaseLayer::init()
{
bool bRes = false;

do
{
CC_BREAK_IF(!Layer::init());

bRes = true;
} while (0);

return bRes;
}

void BaseLayer::SetBkGround( const char* bkImage )
{
m_SpBk1 = Sprite::create(bkImage);
m_SpBk1->setAnchorPoint(Vec2::ZERO);
m_SpBk1->setScale(GetWinSize().width / m_SpBk1->getContentSize().width);
m_SpBk1->setPosition(Vec2::ZERO);

m_SpBk2 = Sprite::create(bkImage);
m_SpBk2->setFlipX(true);
m_SpBk2->setAnchorPoint(Vec2::ZERO);
m_SpBk2->setScale(GetWinSize().width / m_SpBk1->getContentSize().width);
m_SpBk2->setPosition(Vec2(GetWinSize().width, 0));

this->addChild(m_SpBk1);
this->addChild(m_SpBk2);

this->schedule(schedule_selector(BaseLayer::ScrollBkGround), 1/60);
}

Size BaseLayer::GetWinSize()
{
return Director::getInstance()->getWinSize();
}

void BaseLayer::ScrollBkGround(float dt)
{
if (m_SpBk1->getPositionX() <= -GetWinSize().width)
{
m_SpBk1->setPosition(GetWinSize().width, 0);
}
if (m_SpBk2->getPositionX() <= -GetWinSize().width)
{
m_SpBk2->setPosition(GetWinSize().width, 0);
}

m_SpBk1->setPosition(Vec2(m_SpBk1->getPositionX() - 1, 0));

m_SpBk2->setPosition(Vec2(m_SpBk2->getPositionX() - 1, 0));
}

#ifndef __BASELAYER_H__
#define __BASELAYER_H__

#include "cocos2d.h"

USING_NS_CC;

class BaseLayer : public Layer
{
public:
BaseLayer();
~BaseLayer();

virtual bool init() override;

Size GetWinSize();

void SetBkGround(const char* bkImage);
void ScrollBkGround(float dt);

private:

Sprite *m_SpBk1;
Sprite *m_SpBk2;

};

#endif