GroupScope

説明

BeginGroup / EndGroup を管理する Disposable ヘルパークラス

BeginGroup is called at construction, and EndGroup is called when the instance is disposed. When you begin a group, the coordinate system for GUI controls are set so (0,0) is the top-left corner of the group. All controls are clipped to the group. Groups can be nested - if they are, children are clipped to their parents.

これはスクリーン上で GUI 要素をまとめて移動させる場合に非常に便利です。一般的な具体例を上げると、メニューはスクリーンサイズに収まるように設計されるので、大きく表示する GUI はスクリーン内に収まるように中心に配置することがあります。

using UnityEngine;

public class Example : MonoBehaviour
{
    void OnGUI()
    {
        // Constrain all drawing to be within a 800x600 pixel area centered on the screen.
        using (var groupScope = new GUI.GroupScope(new Rect(Screen.width / 2 - 400, Screen.height / 2 - 300, 800, 600)))
        {
            // Draw a box in the new coordinate space defined by the BeginGroup.
            // Notice how (0,0) has now been moved on-screen.
            GUI.Box(new Rect(0, 0, 800, 600), "This box is now centered! - here you would put your main menu");
        }
        // The group is now ended.
    }
}

コンストラクタ