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30 lines
1.1 KiB
30 lines
1.1 KiB
4 years ago
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using System.Collections;
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using System.Collections.Generic;
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using UnityEngine;
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public class UIFollowGameObj : MonoBehaviour {
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public GameObject TargetObj;
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public Camera _camera;
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public Vector3 Offset;
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private Canvas canvas;
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// Use this for initialization
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void Start () {
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canvas = GameObject.Find("Canvas").GetComponent<Canvas>();
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_camera = canvas.GetComponentInChildren<Camera>();
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}
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// Update is called once per frame
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void Update () {
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//目标世界坐标转画布坐标
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Vector3 worldToScreenPoint = Camera.main.WorldToScreenPoint(TargetObj.transform.position);
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//在画布上对应的点
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worldToScreenPoint = new Vector3(worldToScreenPoint.x, worldToScreenPoint.y, canvas.planeDistance);
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Vector3 screenToWorldPoint = _camera.ScreenToWorldPoint(worldToScreenPoint);
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//得到最终画布坐标系中的投影点
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Vector3 projPoint = canvas.transform.worldToLocalMatrix.MultiplyPoint(screenToWorldPoint);
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this.transform.localPosition = new Vector3 (projPoint.x,projPoint.y,0)+Offset;
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}
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}
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