U3D 如何计算一个UI四个角的绝对坐标

最新推荐文章于 2023-03-04 15:05:12 发布

原创最新推荐文章于 2023-03-04 15:05:12 发布 · 870 阅读

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本文介绍了两种在Unity3D中计算UI元素四个角绝对坐标的方案：一种是利用API直接获取，另一种是通过手动计算得出。这两种方法在不同场景下均可使用，并且计算结果一致。

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U3D 如何计算一个UI四个角的绝对坐标

        //方式一，使用API获取
        var rtrans = gameObject.GetComponent<RectTransform>();
        Vector3[] worldcorners = new Vector3[4];
        rtrans.GetWorldCorners(worldcorners);

        //方式二，手动计算
        var cam = GameObject.Find("Camera").GetComponent<Camera>();
        var cam_h = 2 * cam.orthographicSize;
        var cam_w = cam_h * Screen.width / Screen.height;

        var canvasObj = GameObject.Find("Canvas");
        var canvas = canvasObj.GetComponent<Canvas>();
        var canvasScaler = canvasObj.GetComponent<CanvasScaler>();

        float screen_w = Screen.width;
        float screen_h = Screen.height;

        var pos = transform.position;
        var fw = rtrans.rect.width;
        var fh = rtrans.rect.height;

        if (canvasScaler.uiScaleMode == CanvasScaler.ScaleMode.ScaleWithScreenSize)
        {
            screen_w = canvasScaler.referenceResolution.x;
            screen_h = screen_w * Screen.height / Screen.width;
        }
        if (canvas.renderMode == RenderMode.ScreenSpaceCamera)
        {
            fw = rtrans.rect.width / screen_w * cam_w;
            fh = rtrans.rect.height / screen_h * cam_h;
        }

        float[] wcs = new float[4];

        var c1 = pos.x - fw / 2;
        var c2 = pos.x + fw / 2;
        var c3 = pos.y - fh / 2;
        var c4 = pos.y + fh / 2;

        //两种试计算得到的结果完全一样