如何在 libgdx Scene2d 中放大和缩小舞台？

Question

我正在使用 libgdx 制作一个 2d 游戏，并将六边形演员添加到一个组中，然后将其添加到舞台上。对于普通相机，您可以在渲染方法中使用 camera.zoom 来放大和缩小以及 camera.translate 来环游世界。

我一直在使用 stage.getCamera() 获取舞台使用的相机，我仍然可以调用 stage.getcamera().translate 但是没有 stage.getCamera().zoom 选项。

这是我的代码：

//import statements

public class HexGame implements ApplicationListener{

private Stage stage;

private Texture hexTexture;
private Group hexGroup;

private int screenWidth;
private int screenHeight;


@Override
public void create() {

    hexTexture = new Texture(Gdx.files.internal("hex.png"));

    screenHeight = Gdx.graphics.getHeight();
    screenWidth = Gdx.graphics.getWidth();

    stage = new Stage(new ScreenViewport());

    hexGroup = new HexGroup(screenWidth,screenHeight,hexTexture);

    stage.addActor(hexGroup);
}

@Override
public void dispose() {
    stage.dispose();
    hexTexture.dispose();
}

@Override
public void render() {
    Gdx.gl.glClear(GL20.GL_COLOR_BUFFER_BIT);
    stage.act(Gdx.graphics.getDeltaTime());
    stage.draw();

    handleInput();
    stage.getCamera().update();

}


private void handleInput() {

    if (Gdx.input.isKeyPressed(Input.Keys.LEFT)) {
        stage.getCamera().translate(-3, 0, 0);
    }
    if (Gdx.input.isKeyPressed(Input.Keys.RIGHT)) {
        stage.getCamera().translate(3, 0, 0);
    }
    if (Gdx.input.isKeyPressed(Input.Keys.DOWN)) {
        stage.getCamera().translate(0, -3, 0);
    }
    if (Gdx.input.isKeyPressed(Input.Keys.UP)) {
        stage.getCamera().translate(0, 3, 0);
    }

    //This is the part that doesn't work
    /*
    if (Gdx.input.isKeyPressed(Input.Keys.Z)) {
        stage.getCamera().zoom += 0.02;
    }
    */

    }



@Override
public void resize(int width, int height) {
    stage.getViewport().update(width, height);
}

@Override
public void pause() {
}

@Override
public void resume() {
}


}

感谢任何帮助，如果我的代码还有其他问题，请告诉我，我是 libgdx 的新手。谢谢

Answer 1

Zoom 在 OrthographicCamera class 中可用，默认情况下 Stage class 创建一个 OrthographicCamera

/** Creates a stage with a {@link ScalingViewport} set to {@link Scaling#stretch}. The stage will use its own {@link Batch}
     * which will be disposed when the stage is disposed. */
    public Stage () {
        this(new ScalingViewport(Scaling.stretch, Gdx.graphics.getWidth(), Gdx.graphics.getHeight(), new OrthographicCamera()),
            new SpriteBatch());
        ownsBatch = true;
    }

所以您需要将相机投射到 OrthographicCamera:

((OrthographicCamera)stage.getCamera()).zoom += 0.02f;

如何在 libgdx Scene2d 中放大和缩小舞台？

How to zoom in and out on a stage in libgdx Scene2d?

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