yichael_smartbow/Assets/SmartBow/Scripts/Views/InfraredViewParts/DraggablePolygonPoint.cs

using UnityEngine;
using UnityEngine.Events;
using UnityEngine.EventSystems;

public class DraggablePolygonPoint : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler
{
    //操作对应的下标
    [SerializeField]
    int index = 0;
    private Vector3 initialPosition;
    private bool dragging = false;

    public UnityEvent<int,Vector3> OnBeginDragEvent;
    public UnityEvent<int,Vector3> OnEndDragEvent;
    public UnityEvent<int, Vector3> OnDragEvent;

    public void OnBeginDrag(PointerEventData eventData)
    {
        initialPosition = transform.position;
        dragging = true;

        RectTransform rect = (RectTransform)(transform);
        OnBeginDragEvent.Invoke(index, rect.localPosition);
    }

    public void OnDrag(PointerEventData eventData)
    {
        if (dragging)
        {
            transform.position = eventData.position;

            RectTransform rect = (RectTransform)(transform);
            OnDragEvent.Invoke(index, rect.localPosition);
        }
    }

    public void OnEndDrag(PointerEventData eventData)
    {
        dragging = false;
        // 更新多边形的顶点等操作...
        RectTransform rect = (RectTransform)(transform);
        OnEndDragEvent.Invoke(index, rect.localPosition);
    }
}