如何在libgdx Scene2d中对舞台进行缩放？

Question

我正在使用libgdx制作一款2D游戏，并将六边形形状的角色添加到一个组中，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来缩放并使用camera.translate来在世界中移动。

我一直在使用stage.getCamera()获取舞台所使用的相机，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() {
}


}

非常感谢您的帮助，如果我的代码还有其他问题，请让我知道，我刚接触libgdx。谢谢

- EssEllDee

Answer 1

Zoom功能在OrthographicCamera类中可用，并且默认情况下Stage类会创建一个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;
    }

所需做的就是将您的相机转换为 OrthographicCamera：

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

- Saeed Masoumi