Unity点击生成节点连线

Unity点击生成节点连线

1. 效果
   
   2.主要代码
   Test_Line 控制类

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;

public class Test_Line : MonoBehaviour
{
    public GameObject qiu_prefab;
    public List<GameObject> spheres;
    public bool istrue = true;
    public GameObject qr_im;
    private void Update()
    {
        if (Input.GetMouseButtonDown(0) && istrue && !EventSystem.current.IsPointerOverGameObject())
        {
            Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
            RaycastHit hit;
            if (Physics.Raycast(ray, out hit))
            {
                GameObject obj = hit.collider.gameObject;
                if (spheres.Count > 2)
                {
                    if (obj == spheres[0])
                    {
                        qr_im.SetActive(true);
                        Debug.Log("是否闭合");
                    }
                }
                if (obj.layer != LayerMask.NameToLayer("JieDian"))
                {
                    GameObject jiedian = Instantiate(qiu_prefab, hit.point, new Quaternion());
                    spheres.Add(jiedian);
                    if (spheres.Count > 1)
                    {
                        spheres[spheres.Count - 2].GetComponent<DragObjMove>().nextObj = spheres[spheres.Count - 1];
                        spheres[spheres.Count - 2].GetComponent<DragObjMove>().StartTest();
                    }
                }
            }
        }
    }
    public void Bihe()
    {
        istrue = false;
        spheres[spheres.Count - 1].GetComponent<DragObjMove>().nextObj = spheres[0];
        spheres[spheres.Count - 1].GetComponent<DragObjMove>().StartTest();
    }
}

DragObjMove节点控制类

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

public class DragObjMove : MonoBehaviour
{
    private Vector3 offset;
    public GameObject nextObj;

    private LineRenderer lineRenderer;
    private Transform startPoint;
    private Transform endPoint;
    public Material[] materials;
    public void StartTest()
    {
        if (nextObj != null)
        {
            startPoint = transform;
            endPoint = nextObj.transform;
            lineRenderer = GetComponent<LineRenderer>();
            lineRenderer.positionCount = 2;
        }
    }
    private void Update()
    {
        // 确保起点和终点已赋值且LineRenderer组件存在
        if (nextObj != null && lineRenderer != null)
        {
            lineRenderer.SetPosition(0, startPoint.position); // 设置线段的起始位置
            lineRenderer.SetPosition(1, endPoint.position);   // 设置线段的结束位置
        }
    }

    private void OnMouseEnter()
    {
        transform.GetComponent<MeshRenderer>().material = materials[1];

    }
    private void OnMouseDown()
    {
        offset = transform.position - Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, Camera.main.WorldToScreenPoint(transform.position).z));
    }
    private void OnMouseDrag()
    {
        Vector3 newPosition = Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, Camera.main.WorldToScreenPoint(transform.position).z)) + offset;
        transform.position = newPosition;
    }
    private void OnMouseExit()
    {
        transform.GetComponent<MeshRenderer>().material = materials[0];
    }
}

3. 资源包下载链接：下载地址
4. 补充：导入资源包后，需将节点小球预制体的Layer改成“JieDian”。