cocos植物大战僵尸（一）load场景：异步加载资源

1 项目描述

1.1功能描述

使用cocos2dx3.0与C++编写植物大战僵尸，目前完成26种植物编写，后续添加各种僵尸。连载教程陆续更新，apk下载：http://download.youkuaiyun.com/detail/luoyikun/9078421

2 详细设计

2.1 load场景

2.1.1 异步加载资源

要求异步加载资源同时显示Loading...的动画效果。项目加载的是一个plist和png。首先加载png。

Director::getInstance()->getTextureCache()->addImageAsync(PATH_GAME_CACHE_PNG,CC_CALLBACK_1(CLoadingScene::onCallPlistImageAsync, this));

PATH_GAME_CACHE_PNG是要加载的大图路径。然后在回调函数中加载plist，加载完成后跳转场景。

void CLoadingScene::onCallPlistImageAsync(Texture2D* texture)
{
	SpriteFrameCache::getInstance()->addSpriteFramesWithFile(PATH_GAME_CACHE_PLIST, texture);
	CSceneMgr::getInstance()->sceneChange(CSceneMgr::enMainMenuScene);//游戏场景切换进去
}

2.1.2 load场景显示加载动画

即显示Loading...最后的三个点会逐步显示。具体思路：

void CLoadingScene::labLoadingShow()
{
	std::string sLoad = "Loading...";
	Label* laber = Label::create("", "Terminal", 50);
	this->addChild(laber);
	laber->setAnchorPoint(ccp(0, 0.5));
	Size sizeWin = Director::getInstance()->getVisibleSize();
	laber->setPosition(ccp(sizeWin.width / 2 - 100, sizeWin.height / 2));

	Vector<FiniteTimeAction*> m_vecAct;
	for (int i = 7; i <= (int)sLoad.length(); i++)
	{
		auto delay = DelayTime::create(0.1f);
		m_vecAct.pushBack(delay);
		std::string str = sLoad.substr(0, i);
		auto func = [laber, str]() throw() {laber->setString(str); };
		auto call = CallFunc::create(func);
		m_vecAct.pushBack((FiniteTimeAction*)call);
	}
	auto delay = DelayTime::create(0.1f);
	m_vecAct.pushBack(delay);
	auto func = [laber]() throw() {laber->setString("Loading"); };
	auto call = CallFunc::create(func);
	m_vecAct.pushBack((FiniteTimeAction*)call);

	RepeatForever* actForever = RepeatForever::create(Sequence::create(m_vecAct));
	laber->runAction(actForever);
}

最终实现效果，开始游戏显示loading动画，加载完成后进入游戏。

load场景源码下载：

http://download.youkuaiyun.com/detail/luoyikun/9078495