OnGUIをSafeArea内に収めつつ、いろんな解像度の端末で程よい大きさで表示する

SafeAreaIMGUI.cs

using UnityEngine;

public class SafeAreaIMGUI : MonoBehaviour
{
    [SerializeField]
    private float _longEdge = 1920f;

    [SerializeField]
    private float _shortEdge = 1080f;

    [SerializeField]
    private float _scale = 6;

    private void OnGUI()
    {
        var referenceWidth = Screen.orientation == ScreenOrientation.Landscape ? _longEdge : _shortEdge;
        var referenceHeight = Screen.orientation == ScreenOrientation.Portrait ? _longEdge : _shortEdge;
        var scaleFactor = _scale * Mathf.Min(Screen.width / referenceWidth, Screen.height / referenceHeight);
        BeginScaledSafeArea(scaleFactor);
        {
            _scale = GUILayout.HorizontalSlider(_scale, 6, 30f);
            GUILayout.TextArea($"scale : {_scale}", GUILayout.ExpandHeight(true), GUILayout.ExpandWidth(true));
        }
        EndScaledSafeArea();
    }

    private static void BeginScaledSafeArea(float scale)
    {
        if (Mathf.Approximately(scale, 0f)) return;
        var safeArea = Screen.safeArea;
        GUI.matrix = Matrix4x4.TRS(
            new Vector3(safeArea.xMin, Screen.height - safeArea.yMax),
            Quaternion.identity,
            new Vector3(scale, scale, 1f));
        GUILayout.BeginVertical(
            GUILayout.Height(safeArea.height / scale),
            GUILayout.Width(safeArea.width / scale));
    }

    private static void EndScaledSafeArea()
    {
        GUILayout.EndVertical();
    }
}

スケール値の計算をいい感じにやれば、 BeginScaledSafeArea と EndScaledSafeArea で囲むだけでセーフエリア内に好きなスケールでIMGUIを描画できる、かもしれない。

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