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我在我的调整大小方法中使用以下代码来保持多个屏幕尺寸的纵横比:

@Override
public void resize(int width, int height)
{
    float aspectRatio = (float)width / (float)height;
    float scale = 1f;
    Vector2 crop = new Vector2(0, 0);

    if (aspectRatio > globals.ASPECT_RATIO)
    {
        scale = (float)height / (float)globals.VIRTUAL_HEIGHT;
        crop.x = (width - globals.VIRTUAL_WIDTH * scale) / 2f;
    }
    else if (aspectRatio < globals.ASPECT_RATIO)
    {
        scale = (float)width / (float)globals.VIRTUAL_WIDTH;
        crop.y = (height - globals.VIRTUAL_HEIGHT * scale) / 2f;
    }
    else
    {
        scale = (float)width / (float)globals.VIRTUAL_WIDTH;
    }

    float w = (float)globals.VIRTUAL_WIDTH * scale;
    float h = (float)globals.VIRTUAL_HEIGHT * scale;

    viewport = new Rectangle(crop.x, crop.y, w, h);
}

VIRTUAL_WIDTH,VIRTUAL_HEIGHTASPECT_RATIO设置如下:

public final int VIRTUAL_WIDTH = 800;
public final int VIRTUAL_HEIGHT = 480;
public final float ASPECT_RATIO = (float)VIRTUAL_WIDTH / (float)VIRTUAL_HEIGHT;

当屏幕尺寸发生变化时,这对于保持正确的比例非常有效。但是,camera.uproject(我在所有触摸事件之前调用)不能正常工作 - 当调整大小代码将屏幕尺寸更改为 800x480 以外的任何值时,触摸位置不正确。

以下是我在 create() 方法中设置相机的方法:

camera = new OrthographicCamera(globals.VIRTUAL_WIDTH, globals.VIRTUAL_HEIGHT);
camera.setToOrtho(true, globals.VIRTUAL_WIDTH, globals.VIRTUAL_HEIGHT);

这是我的 render() 方法的开始:

camera.update();
Gdx.graphics.getGL20().glViewport((int)viewport.x, (int)viewport.y, 
(int)viewport.width, (int)viewport.height);
Gdx.graphics.getGL20().glClearColor(0, 0, 0, 1);
Gdx.graphics.getGL20().glClear(GL20.GL_COLOR_BUFFER_BIT);

如果我忽略调整大小代码并将glViewport方法调用设置为Gdx.graphics.getWidth()and Gdx.graphics.getHeight(),则camera.unproject可以,但我显然失去了对纵横比的维护。有人有想法么?

以下是我对触摸事件执行 unproject 的方式:

private Vector3 touchPos = new Vector3(0, 0, 0);

public boolean touchDown (int x, int y, int pointer, int newParam)
{
    touchPos.x = x;
    touchPos.y = y;
    touchPos.z = 0; 
    camera.unproject(touchPos);

    //touch event handling goes here...
}

更新

通过实现一个 Stage 对象,我在这方面取得了一些进步,但它仍然不能完美地工作。

下面是我现在如何在我的 create 方法中设置舞台和相机:

stage = new Stage();
camera = new OrthographicCamera(globals.VIRTUAL_WIDTH, globals.VIRTUAL_HEIGHT);
camera.setToOrtho(true, globals.VIRTUAL_WIDTH, globals.VIRTUAL_HEIGHT);
stage.setCamera(camera);

这是我的调整大小代码:

public void resize(int width, int height)
{
    Vector2 size = Scaling.fit.apply(800, 480, width, height);
    int viewportX = (int)(width - size.x) / 2;
    int viewportY = (int)(height - size.y) / 2;
    int viewportWidth = (int)size.x;
    int viewportHeight = (int)size.y;
    Gdx.gl.glViewport(viewportX, viewportY, viewportWidth, viewportHeight);
    stage.setViewport(800, 480, true, viewportX, viewportY, viewportWidth, viewportHeight);
}

这是我的渲染代码的开始:

stage.getCamera().update();
Gdx.graphics.getGL20().glClearColor(0, 0, 0, 1);
Gdx.graphics.getGL20().glClear(GL20.GL_COLOR_BUFFER_BIT);
spriteBatch.setProjectionMatrix(stage.getCamera().combined);

以下是我处理触摸事件的方式:

private Vector3 touchPos = new Vector3(0, 0, 0);

public boolean touchDown (int x, int y, int pointer, int newParam)
{
    touchPos.x = x;
    touchPos.y = y;
    touchPos.z = 0;
    stage.getCamera().unproject(touchPos);

    //touch event handling goes here...
}

现在,当屏幕处于默认大小并且屏幕被放大时,这将起作用。然而,当屏幕尺寸减小时,触摸点变得越来越不准确,屏幕变得越小。

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2 回答 2

2

设法找到了这个问题的答案。我只需要使用带有 Vector3、viewportX、viewportY、viewportWidth 和 viewportHeight 参数的 camera.unproject 方法调用。所需的视口参数是通过上面显示的调整大小代码计算的。

于 2013-09-27T15:21:43.537 回答
1

为了解决您的问题,新的 Stage 系统中已经实施了一个解决方案。请查看wiki scene2d #viewport。要获得固定的纵横比,您无需手动调整大小和适应。以下是来自 wiki 的带有黑条的示例:

public void resize (int width, int height) {
        Vector2 size = Scaling.fit.apply(800, 480, width, height);
        int viewportX = (int)(width - size.x) / 2;
        int viewportY = (int)(height - size.y) / 2;
        int viewportWidth = (int)size.x;
        int viewportHeight = (int)size.y;
        Gdx.gl.glViewport(viewportX, viewportY, viewportWidth, viewportHeight);
        stage.setViewport(800, 480, true, viewportX, viewportY, viewportWidth, viewportHeight);
}
于 2013-09-19T08:19:56.407 回答