【cocos2dx 3.3】口袋空战1 背景层

分析：

• 背景不断地向左滚动
• 可以用2个背景图片，交替向左移动实现

背景素材：

代码：

BackGround.h

#include "cocos2d.h"

USING_NS_CC;

class BackGround : public Layer
{

public:

	virtual bool init();
	CREATE_FUNC(BackGround);

	//定义2个背景，实现滚动效果
	Sprite *land1;
	Sprite *land2;

	void landMove(float dt);  
};

BackGround.cpp

#include "BackGround.h"

USING_NS_CC;

bool BackGround::init()
{
	Vec2 origin = Director::getInstance()->getVisibleOrigin();  
	Size visibleSize = Director::getInstance()->getVisibleSize(); 

	//定义2个背景
	land1 = Sprite::create("bg.png");
	land1->setPosition(Point(origin.x+land1->getContentSize().width/2,origin.y+land1->getContentSize().height/2));  
	land1->getTexture()->setAliasTexParameters();  
	addChild(land1);

	land2 = Sprite::create("bg.png");
	land2->setPosition(Point(origin.x+land1->getPositionX()+land1->getContentSize().width-2,land1->getPositionY()));  
    land2->getTexture()->setAliasTexParameters(); 
	addChild(land2);

	//开启计时器，不断交替左移
	schedule(schedule_selector(BackGround::landMove), 1/60);

	return true;
}

void BackGround::landMove(float dt)
{
	land1->setPositionX(land1->getPositionX()-2);  
    land2->setPositionX(land1->getPositionX()+land1->getContentSize().width-2);  
    if (land2->getPositionX()==land2->getContentSize().width/2)  
    {  
        land1->setPositionX(land2->getContentSize().width/2);  
    }  
}