AndEngine 分析之四-----Engine
Engine:
The Engine make the game proceed in small discrete steps of time. The Engine manages to synchronize a periodic drawing and updating of the Scene, which contains all the content that your game is currently handling actively. There usually is one Scene per Engine, except for the SplitScreenEngines.
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Engine使游戏在不连续的时间进行，它设法同步更新和画场景，通常每一个Engine对应一个Scene，除了SplitScreenEngines
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1.通常在客户端实现BaseGameActivity时在覆写onLoadEngine（）方法时执行的操作：
public Engine onLoadEngine() {this.mCamera = new Camera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT);return new Engine(new EngineOptions(true, ScreenOrientation.LANDSCAPE, new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT), this.mCamera));}?其中在Engine类中的Engine（EngineOptions opts）具体方法如下：
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public Engine(final EngineOptions pEngineOptions) {TextureRegionFactory.setAssetBasePath("");SoundFactory.setAssetBasePath("");MusicFactory.setAssetBasePath("");FontFactory.setAssetBasePath("");BufferObjectManager.setActiveInstance(this.mBufferObjectManager);this.mEngineOptions = pEngineOptions;this.setTouchController(new SingleTouchControler());this.mCamera = pEngineOptions.getCamera();if(this.mEngineOptions.needsSound()) {this.mSoundManager = new SoundManager();}if(this.mEngineOptions.needsMusic()) {this.mMusicManager = new MusicManager();}if(this.mEngineOptions.hasLoadingScreen()) {this.initLoadingScreen();}this.mUpdateThread.start();}?
其中，在代码的后部分：
if(this.mEngineOptions.hasLoadingScreen()) {this.initLoadingScreen();}初始化下载Screen的操作：
?private void initLoadingScreen() {final ITextureSource loadingScreenTextureSource = this.mEngineOptions.getLoadingScreenTextureSource();final Texture loadingScreenTexture = TextureFactory.createForTextureSourceSize(loadingScreenTextureSource);final TextureRegion loadingScreenTextureRegion = TextureRegionFactory.createFromSource(loadingScreenTexture, loadingScreenTextureSource, 0, 0);this.setScene(new SplashScene(this.getCamera(), loadingScreenTextureRegion));}?至此Engine初始化了Scene，并后续对Scene进行更新操作。
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2.Engine主要做的操作：
??? SoundManager
??? MusicManager
??? BufferObjectManager
??? TouchController
??? FontManager
完成基础服务的初始化和注册操作。
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