java - LibGDX FitViewport 正确调整大小，但在更改屏幕后重置

Question

我在 LibGDX 中使用 FitViewport 时遇到问题。调整窗口大小时，一切正常。接下来，我切换屏幕，所有内容都会翻转回正常尺寸，并且图像被裁剪到左侧，而应用程序的尺寸保持调整大小。

调整大小后，FitViewport 工作正常:

但是，当我按下到第一个屏幕按钮时，就会发生这种情况:

因此，除了缩放按钮和图像的位置之外，一切正常(按到主屏幕按钮可返回原始屏幕)。

窗口的尺寸保持不变，但图像恢复到其原始大小(500x500)并放置在坐标(0,0)处。

关于如何解决这个问题有什么想法或建议吗？我正在为这个问题绞尽脑汁，似乎无法正确处理...我希望它就像第一个屏幕一样。

<小时/>

这些是我的类文件:我使用抽象 Screen 类来跟踪屏幕(并用于稍后扩展)和 ScreenManager:

主类:

public class MainClass implements ApplicationListener {

    @Override
    public void create () {
        ScreenManager.setScreen(new MainScreen());
    }

    @Override
    public void render () {
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);

        if (ScreenManager.getCurrentScreen() != null) {
            ScreenManager.getCurrentScreen().render();
        }
    }

    @Override
    public void resize(int width, int height) {
        if (ScreenManager.getCurrentScreen() != null)
            ScreenManager.getCurrentScreen().resize(width, height);
    }
}

抽象屏幕类:

public abstract class Screen {

    public abstract void create();

    public abstract void render();

    public abstract void resize(int width, int height);

    public abstract void pause();

    public abstract void dispose();

    public abstract void resume();
}

屏幕管理器类:

public class ScreenManager {

    private static Screen currentScreen;

    public static void setScreen(Screen screen) {
            if (currentScreen != null)
            currentScreen.dispose();
        currentScreen = screen;
        currentScreen.create();
    }

    public static Screen getCurrentScreen() {
        return currentScreen;
    }
}

主屏幕类:

public class MainScreen extends Screen {

    private Texture bg1;
    private Image bg1Image;
    private Skin skin;

    private Stage stage;
    private OrthographicCamera camera;
    private FitViewport fitViewport;

    @Override
    public void create() {
        camera = new OrthographicCamera(Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
        camera.setToOrtho(false, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
        fitViewport = new FitViewport(Gdx.graphics.getWidth(), Gdx.graphics.getHeight(), camera);

        bg1 = new Texture(Gdx.files.internal("background1.png"));
        bg1Image = new Image(bg1);
        skin = new Skin(Gdx.files.internal("uiskin.json"));

        TextButton nextButton = new TextButton("to first screen", skin);
        nextButton.setPosition(200, 200);
        nextButton.addListener(new ClickListener() {
            @Override
            public void clicked(InputEvent event, float x, float y) {
                ScreenManager.setScreen(new FirstScreen());
                super.clicked(event, x, y);
            }
        });

        stage = new Stage(fitViewport);
        stage.addActor(bg1Image);
        stage.addActor(nextButton);

        Gdx.input.setInputProcessor(stage);
    }

    @Override
    public void render() {
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);

        stage.act(Gdx.graphics.getDeltaTime());

        fitViewport.apply();
        stage.draw();
    }

    @Override
    public void resize(int width, int height) {
        fitViewport.update(width, height, true);
        camera.update();
    }
}

第一屏幕类(class):

public class FirstScreen extends Screen {

    private Texture bg2;
    private Image bg2Image;
    private Skin skin;

    private Stage stage;
    private OrthographicCamera camera;
    private FitViewport fitViewport;

    @Override
    public void create() {
        camera = new OrthographicCamera(Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
        camera.setToOrtho(false, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
        fitViewport = new FitViewport(Gdx.graphics.getWidth(), Gdx.graphics.getHeight(), camera);

        bg2 = new Texture(Gdx.files.internal("background2.png"));
        bg2Image = new Image(bg2);
        skin = new Skin(Gdx.files.internal("uiskin.json"));

        TextButton prevButton = new TextButton("to main screen", skin);
        prevButton.setPosition(200, 200);
        prevButton.addListener(new ClickListener() {
            @Override
            public void clicked(InputEvent event, float x, float y) {
                ScreenManager.setScreen(new MainScreen());
                super.clicked(event, x, y);
            }
        });

        stage = new Stage(fitViewport);
        stage.addActor(bg2Image);
        stage.addActor(prevButton);

        Gdx.input.setInputProcessor(stage);
    }

    @Override
    public void render() {
        Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);

        stage.act(Gdx.graphics.getDeltaTime());

        fitViewport.apply();
        stage.draw();
    }

    @Override
    public void resize(int width, int height) {
        fitViewport.update(width, height, true);
        camera.update();
    }
}

(我知道我提供了很多类(class)，但我想详细解释所有内容......)我猜这可能是一件小事，但我似乎无法把它做好，这让我发疯......任何帮助或建议将不胜感激!

Answer 1

您的问题在这里:

    camera = new OrthographicCamera(Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
    camera.setToOrtho(false, Gdx.graphics.getWidth(), Gdx.graphics.getHeight());
    fitViewport = new FitViewport(Gdx.graphics.getWidth(), Gdx.graphics.getHeight(), camera);

每次检查当前窗口大小并创建具有窗口大小的视口(viewport)时。解决方案是手动定义窗口大小并根据该值创建新的屏幕视口(viewport)。

在您的主类中创建静态公共(public)大小变量(您当然可以在您想要或不创建的任何地方创建它，但直接写入值 - 但这由于将来的重构而不好)

    public static final float WIDTH = 800, HEIGHT = 600; //or any other values you need

然后创建你的视口(viewport)和相机，就像

    camera = new OrthographicCamera(Main.WIDTH, Main.HEIGHT);
    camera.setToOrtho(false, Main.WIDTH, Main.HEIGHT);
    fitViewport = new FitViewport(Main.WIDTH, Main.HEIGHT, camera);

仅此而已。

<小时/>

如果您不需要这个相机，也请考虑不要创建新相机 - 也许默认的舞台相机对您来说就足够了？想一想。