Handles.Slider2D

参数

返回

Vector3 通过用户与手柄的交互修改的新值。如果用户没有移动手柄，则将返回传递给相应函数的位置值。

描述

创建一个沿两个轴定义的平面移动的 3D 滑动条。

This method will draw a 3D-draggable handle on the screen. The handle is constrained to sliding along a plane in 3D space.


2D slider handle in the Scene View.

Add the following script to your Assets folder as Slider2DExample.cs and add the Slider2DExample component to an object in a scene.

using UnityEngine;

[ExecuteInEditMode]
public class Slider2DExample : MonoBehaviour
{
    public Vector3 targetPosition { get { return m_TargetPosition; } set { m_TargetPosition = value; } }
    [SerializeField]
    private Vector3 m_TargetPosition = new Vector3(1f, 0f, 2f);

    public virtual void Update()
    {
        transform.LookAt(m_TargetPosition);
    }
}

将以下脚本作为 Slider2DExampleEditor.cs 添加到 Assets/Editor，然后选择包含 Slider2DExample 组件的对象。

using UnityEditor;
using UnityEngine;

[CustomEditor(typeof(Slider2DExample)), CanEditMultipleObjects]
public class Slider2DExampleEditor : Editor
{
    protected virtual void OnSceneGUI()
    {
        Slider2DExample example = (Slider2DExample)target;

        float size = HandleUtility.GetHandleSize(example.targetPosition) * 0.5f;
        float snap = 0.1f;
        Vector3 handleDirection = Vector3.up;

        EditorGUI.BeginChangeCheck();
        Vector3 newTargetPosition = Handles.Slider2D(example.targetPosition, handleDirection, Vector3.right, Vector3.forward, size, Handles.CircleHandleCap, snap);
        if (EditorGUI.EndChangeCheck())
        {
            Undo.RecordObject(example, "Change Look At Target Position");
            example.targetPosition = newTargetPosition;
            example.Update();
        }
    }
}