ChaseEntity功能在andengine中无法正常工作

Question

我的代码需要帮助。我想要做的是创建一个简单的移动修改器演示，以尝试更好地理解andengine。我所做的是创建一个方向背景精灵，它有粗体字母，分别是顶部，底部，左侧，右侧，所以我可以跟踪我的实体从哪里开始以及它最终到达的位置。问题是setChaseEntity函数。似乎每次我运行代码时我的实体都会卡住。如果你能提供帮助，我将不胜感激....感谢您的时间....

@Override
public EngineOptions onCreateEngineOptions() {

    boundCamera = new BoundCamera(0, 0, CAMERA_WIDTH, CAMERA_HEIGHT);

    boundCamera.setBounds(0, 0, CAMERA_WIDTH * 4, CAMERA_HEIGHT * 4);


    return new EngineOptions(true, ScreenOrientation.LANDSCAPE_FIXED, new RatioResolutionPolicy(CAMERA_WIDTH, CAMERA_HEIGHT), boundCamera);

}

@Override
public void onCreateResources(
        OnCreateResourcesCallback pOnCreateResourcesCallback)
        throws Exception {

    BitmapTextureAtlasTextureRegionFactory.setAssetBasePath("gfx/");

    this.mBitmapTextureAtlas = new BitmapTextureAtlas(this.getTextureManager(),800,480);
    this.mDirection = BitmapTextureAtlasTextureRegionFactory.createFromAsset(this.mBitmapTextureAtlas,this,"direction.png",0,0);
    this.mBitmapTextureAtlas.load();

    pOnCreateResourcesCallback.onCreateResourcesFinished();

}



@Override
public void onCreateScene(OnCreateSceneCallback pOnCreateSceneCallback)
        throws Exception {

    this.mEngine.registerUpdateHandler(new FPSLogger());

    mScene = new Scene();

    Sprite background = new Sprite(0,0,mDirection, mEngine.getVertexBufferObjectManager());
    SpriteBackground direction = new SpriteBackground(255,255,255,background);

    mScene.setBackground(direction);



    pOnCreateSceneCallback.onCreateSceneFinished(mScene);


}

@Override
public void onPopulateScene(Scene pScene,
        OnPopulateSceneCallback pOnPopulateSceneCallback) throws Exception {

    final int rectangleDimensions = 80;

    final int initialPosition = (int) (rectangleDimensions * 0.5f);

    Rectangle rectangle = new Rectangle(initialPosition, initialPosition, rectangleDimensions, rectangleDimensions, mEngine.getVertexBufferObjectManager());

    rectangle.setColor(Color.RED);
    mScene.attachChild(rectangle);
    this.boundCamera.setChaseEntity(rectangle);

    final float duration = 3;

    final float fromX = initialPosition;
    final float toX = CAMERA_WIDTH - rectangleDimensions * 0.5f;
    final float fromY = initialPosition;
    final float toY = CAMERA_HEIGHT - rectangleDimensions * 0.5f;

    MoveModifier moveModifier = new MoveModifier(duration, fromX, fromY, toX, toY);

    rectangle.registerEntityModifier(moveModifier);

    pOnPopulateSceneCallback.onPopulateSceneFinished();
}