using UnityEngine;

public class ShowHandles : MonoBehaviour
{
    public float Size = 1;
    public Vector3 LastPos { get; set; } = new Vector3(1, 0, 0);

    public void OnDrawGizmosSelected()
    {
        Gizmos.DrawWireSphere(transform.position, Size);
    }
}

using Unity.VisualScripting;
using UnityEditor;
using UnityEngine;

[CustomEditor(typeof(ShowHandles))]
[CanEditMultipleObjects]
public class ShowHandles_UI : Editor
{
    private ShowHandles _node;

    public void OnEnable()
    {
        _node = target.GetComponent();
    }
    public void OnSceneGUI()
    {
        var handlePosition = _node.gameObject.transform.position + _node.LastPos;

        Vector3 newpos = Handles.FreeMoveHandle(
            handlePosition,
            Quaternion.identity, 0.5f, Vector3.zero, Handles.RectangleHandleCap);

        if (newpos != handlePosition)
        {
            _node.LastPos = newpos - _node.gameObject.transform.position;
            _node.Size = _node.LastPos.magnitude;
        }

    }
}

using System.Collections.Generic;
using System.Linq;
using UnityEngine;

public class ShowPath : MonoBehaviour
{
    public bool EditPath = true;
    public List Nodes = new List();

    public void OnDrawGizmosSelected()
    {
        if (!EditPath)
            return;

        if (!Nodes.Any())
            return;

        Vector3 posLast = Nodes[0];
        
        for (int i = 1; i < Nodes.Count; i++)
        {
            Gizmos.DrawLine(Nodes[i], posLast);
            posLast = Nodes[i];
        }
    }
}

using Unity.VisualScripting;
using UnityEditor;
using UnityEngine;

[CustomEditor(typeof(ShowPath))]
[CanEditMultipleObjects]
public class ShowPath_UI : Editor
{
    private ShowPath _node;

    public void OnEnable()
    {
        _node = target.GetComponent();
    }

    public void OnSceneGUI()
    {
        if (!_node.EditPath)
            return;

        Vector3 handlePosition = new Vector3(1, 0, 0);

        for (int i = 0; i < _node.Nodes.Count; i++)
        {
            handlePosition = _node.Nodes[i];

            Vector3 newpos = Handles.FreeMoveHandle(
             handlePosition,
             Quaternion.identity, 0.5f, Vector3.zero, Handles.RectangleHandleCap);

            if (newpos != handlePosition)
            {
                newpos.y = 0;
                _node.Nodes[i] = newpos;
            }
        }

        handlePosition.x += 2f;
        Quaternion q = Quaternion.Euler(90, 0, 0);
        if (Handles.Button(handlePosition, q, 0.5f, 0.5f, Handles.CircleHandleCap))
        {
            _node.Nodes.Add(handlePosition);
        }

    }
}