【雷电】源码分析（三）-- 游戏背景

来源：互联网发布：ip网络对讲终端编辑：程序博客网时间：2024/05/06 18:25

背景图至上往下无限滚动

// 背景图中障碍物, 由tiled编辑的m_backTileMap = CCTMXTiledMap::create("level01.tmx");addChild(m_backTileMap, -9);m_backTileMapHeight = m_backTileMap->getMapSize().height * m_backTileMap->getTileSize().height; //获取tile map的高度//刚开始就称动m_backSkyHeight -= 48;m_backTileMapHeight -= 200;m_backSky->runAction(CCMoveBy::create(3, ccp(0, -48)));//为背景图移动m_backTileMap->runAction(CCMoveBy::create(3, ccp(0, -200)));//障碍物移动m_isBackSkyReload=false;m_isBackTileReload=false;schedule(schedule_selector(HelloWorld:: movingBackground),3);

3秒执行调用一次，背景图3秒持续称动一个位置，当第一张背景图和障碍物图项部超过屏幕顶时，第二张图接上3秒执行调用一次，背景图3秒持续称动一个位置，当第一张背景图和障碍物图项部超过屏幕顶时，第二张图接上

void HelloWorld::movingBackground(float dt){m_backSky->runAction(CCMoveBy::create(3, ccp(0, -48)));m_backTileMap->runAction(CCMoveBy::create(3, ccp(0, -200)));// 每次移动48m_backSkyHeight -= 48;// 每次移动200m_backTileMapHeight -= 200;// 若背景图的顶部到达屏幕顶部或在顶部以下if (m_backSkyHeight <= winSize.height) {if (!m_isBackSkyReload) {// 如果另一张图还没加载则create一个m_backSkyRe = CCSprite::create("bg01.jpg");m_backSkyRe->setAnchorPoint(ccp(0, 0));addChild(m_backSkyRe, -10);m_backSkyRe->setPosition(ccp(0, winSize.height));//第二图与第一图连接上// 反转标志位m_isBackSkyReload = true;}// 第二张图紧接着第一张图滚动m_backSkyRe->runAction(CCMoveBy::create(3, ccp(0, -48)));}// 若第一张背景图完全经过屏幕if (m_backSkyHeight <= 0) {m_backSkyHeight = m_backSky->getContentSize().height;// 移除第一张的精灵this->removeChild(m_backSky, true);// 指向第二张图的精灵m_backSky = m_backSkyRe;// 第二张的精灵指针置空m_backSkyRe = NULL;// 反转标志位m_isBackSkyReload = false;}//若障碍物图到达屏幕顶部if (m_backTileMapHeight <= winSize.height) {//若第二障碍物图没有加载则创建if (!m_isBackTileReload) {m_backTileMapRe = CCTMXTiledMap::create("level01.tmx");this->addChild(m_backTileMapRe, -9);m_backTileMapRe->setPosition(0, winSize.height);m_isBackTileReload = true;}m_backTileMapRe->runAction(CCMoveBy::create(3, ccp(0, -200)));}//若障碍物图完全经过屏幕 , m_backTileMap指向第二张if (m_backTileMapHeight <= 0) {m_backTileMapHeight = m_backTileMap->getMapSize().height * m_backTileMap->getTileSize().height;this->removeChild(m_backTileMap, true);m_backTileMap = m_backTileMapRe;m_backTileMapRe = NULL;m_isBackTileReload = false;}}

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