screen - LibGdx - 屏幕之间的转换

Question

我正在尝试更改 Libgdx 屏幕之间的动画。我想编写我的自定义动画（淡入、淡出等）。有人可以给我一个线索吗？我似乎无法在 Libgdx 代码中找到转换的实现。

Answer 1

这是我所做的：

FadeIn 非常简单，只需将其添加到您的淡入淡出 Screens show() 中：

stage.getRoot().getColor().a = 0;
stage.getRoot().addAction(fadeIn(0.5f));

FadeOut 有点棘手。您不想立即切换屏幕，因此不要调用 game.setScreen(newScreen) 在淡出屏幕中创建一个方法，如下所示：

public void switchScreen(final Game game, final Screen newScreen){
    stage.getRoot().getColor().a = 1;
    SequenceAction sequenceAction = new SequenceAction();
    sequenceAction.addAction(fadeOut(0.5f));
    sequenceAction.addAction(run(new Runnable() {
        @Override
        public void run() {
            game.setScreen(newScreen);
        }
    }));
    stage.getRoot().addAction(sequenceAction);
}

像这样，您在淡出期间延迟屏幕切换。

Answer 2

我已经使用 Scene2D 和通用补间引擎实现了一些滑动过渡。您可以在此处找到示例代码。

http://www.netthreads.co.uk/2012/02/09/libgdx-scene2d-demo-with-scene-transitions/

更新：这篇文章说明了我实现滑动过渡的方法。底部有一个链接，可将您带到此处的一组演示https://github.com/alistairrutherford/libgdx-demos

关于如何构建演示有明确的说明，但您至少需要对 maven 以及如何设置有基本的了解。

Answer 3

我已经实现了类似的方法。感谢 Gustavo Steigert，我从他的博客中学到了很多东西，在这里您可以找到他的示例，其中包含淡入和淡出的序列。

http://steigert.blogspot.in/2012/02/3-libgdx-tutorial-scene2d.html

您可以完全浏览他的博客，以更好地了解事情的流程，并在每个帖子的末尾找到帖子源代码的标签。

Answer 4

这是我的游戏在屏幕之间的过渡动​​画中的示例代码： 在MainGame课堂上：

@Override public void setScreen(final Screen screen) {
        if (getScreen() == null)
        {
            createScreenInAction(screen);
            return;
        }
        createScreenOutAction(getScreen(), new Runnable() {
            @Override public void run() {
                createScreenInAction(screen);
            }
        });

    }
    private void createScreenOutAction(final Screen screen , Runnable runnable) {
        Actor actor = ((BaseScreenAdapter) screen).getStage().getRoot();
        actor.setOrigin(WIDTH_HALF,HEIGHT_HALF);
        actor.getColor().a = 1;
        SequenceAction sequenceAction = new SequenceAction();
        sequenceAction.addAction(Actions.parallel(Actions.alpha(0,SCREEN_SWITCH_DURATION) , Actions.scaleTo(1.5f,1.5f , SCREEN_SWITCH_DURATION, Interpolation.exp5)));
        sequenceAction.addAction(Actions.run(runnable));
        actor.addAction(sequenceAction);
    }
    private void createScreenInAction(final Screen screen) {
        StarsGame.super.setScreen(screen);
        Actor actor = ((BaseScreenAdapter) screen).getStage().getRoot();
        actor.setOrigin(WIDTH_HALF,HEIGHT_HALF);
        actor.getColor().a = 0;
        SequenceAction sequenceAction = new SequenceAction();
        sequenceAction.addAction(Actions.scaleTo(1.5f,1.5f , 0));
        sequenceAction.addAction(Actions.parallel(Actions.alpha(1,SCREEN_SWITCH_DURATION) , Actions.scaleTo(1.0f,1.0f , SCREEN_SWITCH_DURATION , Interpolation.exp5)));
        actor.addAction(sequenceAction);

    }

我所有的屏幕都扩展为BaseScreenAdapter：

public abstract class BaseScreenAdapter extends ScreenAdapter implements BaseRequest.BaseResponseError{
    protected final AssetsController mAssets;
    protected final MySettings mSettings;
    protected StarsGame mGame;
    protected Stage mStage;
    protected Viewport mViewport;
    protected OrthographicCamera mCamera;
    protected InputMultiplexer multiplexer;
    protected LoadingActor mLoadingActor;
    //==============================================================
    // METHODS
    //==============================================================
    public BaseScreenAdapter(StarsGame game) {
        this.mGame = game;
        mCamera = new OrthographicCamera(/*StarsGame.WIDTH, StarsGame.HEIGHT*/);
        mCamera.position.set(StarsGame.WIDTH_HALF, StarsGame.HEIGHT, 0);
        mViewport = new FitViewport(StarsGame.WIDTH, StarsGame.HEIGHT, mCamera);
        mCamera.position.set(mCamera.viewportWidth / 2f, mCamera.viewportHeight / 2 , 0);

        initStage();
        initInputMultiplexer();
    }

    public Stage getStage() {
        return mStage;
    }
    private void initStage() {
        mStage = new Stage(mViewport);
        mStage.addListener(new InputListener() {
            @Override public boolean keyUp(InputEvent event, int keycode) {
                if (keycode == Input.Keys.BACK)
                {
                    onBackPressed();
                }
                return super.keyUp(event, keycode);
            }
        });
    }
}