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我有以下为 LibGdx OpenGL 项目编写的 Java 类。无论您如何通过上下或两侧的上下左右调整大小，相机都会保持屏幕的纵横比。到目前为止，一切都很好。

当我尝试获取单击的鼠标 x、y 坐标并且该轴涉及信箱时，问题就出现了。首先是类：

public class Camera {

private static float viewportWidth;
private static float viewportHeight;
private static float aspectRatio;
private static float barSize;

/**
  * Creates an orthographic camera where the "play area" has the given viewport size. The viewport will be scaled to maintain the aspect ratio.
  * 
  * @param virtualWidth the width of the game screen in virtual pixels.
  * @param virtualHeight the height of the game screen in virtual pixels.
  * @return the new camera.
  * 
  */

public static OrthographicCamera createCamera(float virtualWidth, float virtualHeight) {

    aspectRatio = virtualWidth / virtualHeight;


    float physicalWidth = Gdx.graphics.getWidth();
    float physicalHeight = Gdx.graphics.getHeight();

    if (physicalWidth / physicalHeight >= aspectRatio) {
//      Letterbox left and right.
         viewportHeight = virtualHeight;
         viewportWidth = viewportHeight * physicalWidth / physicalHeight;
         barSize = ????;
    }
    else {
//      Letterbox above and below.
       viewportWidth = virtualWidth;
       viewportHeight = viewportWidth * physicalHeight / physicalWidth;
       barSize = ????;
    }

    OrthographicCamera cam = new OrthographicCamera(viewportWidth , viewportHeight);
    cam.position.set(virtualWidth / 2, virtualHeight / 2, 0);
    cam.rotate(180, 1, 0, 0);
    cam.update();
    Gdx.app.log("BTLog", "barSize:"+barSize);
    return cam;
}

public static float getViewportWidth() {
    return viewportWidth;
}

public static float getViewportHeight() {
    return viewportHeight;
}
}

当偶数发生时，LibGdx 为我提供 x 和 y 坐标，我需要将这些原始坐标转换为我的相机的比例（虚拟高度和宽度）。

当屏幕被拉伸（完全没有信箱）时，很容易通过使用以下方法获得 x 和 y 坐标：

xRelative = (int) (x / (float)Gdx.graphics.getWidth() * Camera.getViewportWidth());
yRelative = (int) (y / (float)Gdx.graphics.getHeight() * Camera.getViewportHeight());

问题是当信箱发挥作用时，它会抛出该轴的坐标。我知道我需要考虑信箱的宽度，但我花了很长时间弄清楚如何计算它。

在上面我有“barSize = ????;” 我的第一直觉是这样做：barSize = physicalHeight - viewportHeight; // 例如使用高度

一旦我得到 barSize，我很确定我可以使用它来获得正确的数字（例如使用 y 轴）：

yRelative = (int) (y / (float)Gdx.graphics.getHeight() * Camera.getViewportHeight() - Camera.getBarSize());

但数字不匹配。任何建议将不胜感激！

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1 回答 1

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Ray ray = camera.getPickRay(x, y);
System.out.println(ray.origin.x);
System.out.println(ray.origin.y);
于 2011-04-24T07:13:13.407 回答