Handles.BeginGUI

Description

在 3D 手柄 GUI 内开始一个 2D GUI 块。

函数调用的 GUILayout 序列的开头。 根据预期，EndGUI 用于关闭这些 GUI。

另请参阅：Handles.EndGUI。


GUI in the Scene View.

// Change the transform values for the selected object.
// When selected this script starts and the handleExample is managed.
// The HandlesGUI.BeginGUI() and EndGUI() functions allow the shieldArea
// to be changed back to five, which is the starting value.

using UnityEditor;
using UnityEngine;

[CustomEditor(typeof(HandleExample))]
class HandleExampleEditor : Editor
{
    protected virtual void OnSceneGUI()
    {
        HandleExample handleExample = (HandleExample)target;

        if (handleExample == null)
        {
            return;
        }

        Handles.color = Color.yellow;

        GUIStyle style = new GUIStyle();
        style.normal.textColor = Color.green;

        Vector3 position = handleExample.transform.position + Vector3.up * 2f;
        string posString = position.ToString();

        Handles.Label(position,
            posString + "\nShieldArea: " +
            handleExample.shieldArea.ToString(),
            style
            );

        Handles.BeginGUI();
        if (GUILayout.Button("Reset Area", GUILayout.Width(100)))
        {
            handleExample.shieldArea = 5;
        }
        Handles.EndGUI();

        Handles.DrawWireArc(
            handleExample.transform.position,
            handleExample.transform.up,
            -handleExample.transform.right,
            180,
            handleExample.shieldArea);

        handleExample.shieldArea =
            Handles.ScaleValueHandle(handleExample.shieldArea,
                handleExample.transform.position + handleExample.transform.forward * handleExample.shieldArea,
                handleExample.transform.rotation,
                1, Handles.ConeHandleCap, 1);
    }
}

添加一个脚本，指定可在 SceneView 中 生成动画的对象。

using UnityEngine;

[ExecuteInEditMode]
public class HandleExample : MonoBehaviour
{
    public float shieldArea = 5.0f;
}