_xiaofang/xiaofang/Assets/Script/hylScripts/TargetIndicator.cs

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

public class TargetIndicator : MonoBehaviour
{
    public Camera mainCamera;              // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    public Transform target;               // Ŀ<><C4BF><EFBFBD><EFBFBD>
    public RectTransform uiCanvas;         // UI Canvas <20><> RectTransform
    public RectTransform targetIcon;       // Ŀ<><C4BF>ͼ<EFBFBD><CDBC><EFBFBD><EFBFBD> UI
    public Text distanceText;              // <20><>Ļ<EFBFBD><C4BB><EFBFBD><EFBFBD>ʾ<EFBFBD>ľ<EFBFBD><C4BE><EFBFBD><EFBFBD>ı<EFBFBD>
    public RectTransform arrowIcon;        // <20><>Ļ<EFBFBD><C4BB><EFBFBD><EFBFBD>ͷͼ<CDB7><CDBC>
    public Text arrowDistanceText;         // <20><>Ļ<EFBFBD><C4BB><EFBFBD><EFBFBD>ͷ<EFBFBD><CDB7><EFBFBD><EFBFBD><EFBFBD>ľ<EFBFBD><C4BE><EFBFBD><EFBFBD>ı<EFBFBD>

    public float edgePadding = 50f;        // <20><>ͷ<EFBFBD><CDB7><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ļ<EFBFBD><C4BB>Ե<EFBFBD>ļ<EFBFBD><C4BC><EFBFBD>
    public Vector2 textOffset = new Vector2(0, -30); // <20>ı<EFBFBD><C4B1><EFBFBD><EFBFBD>Լ<EFBFBD>ͷ<EFBFBD><CDB7>ƫ<EFBFBD><C6AB>

    void Update()
    {
        // <20><>Ŀ<EFBFBD><C4BF><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ת<EFBFBD><D7AA><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ļ<EFBFBD><C4BB><EFBFBD><EFBFBD>
        Vector3 screenPoint = mainCamera.WorldToScreenPoint(target.position);

        // <20><><EFBFBD><EFBFBD>Ŀ<EFBFBD><C4BF><EFBFBD>Ƿ<EFBFBD><C7B7><EFBFBD><EFBFBD><EFBFBD>Ļ<EFBFBD><C4BB>
        if (screenPoint.z > 0 && screenPoint.x > 0 && screenPoint.x < Screen.width && screenPoint.y > 0 && screenPoint.y < Screen.height)
        {
            // Ŀ<><C4BF><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ļ<EFBFBD>ڣ<EFBFBD><DAA3><EFBFBD>ʾĿ<CABE><C4BF>ͼ<EFBFBD><CDBC>
            targetIcon.gameObject.SetActive(true);
            arrowIcon.gameObject.SetActive(false); // <20><><EFBFBD>ؼ<EFBFBD>ͷ
            arrowDistanceText.gameObject.SetActive(false); // <20><><EFBFBD>ؼ<EFBFBD>ͷ<EFBFBD><CDB7><EFBFBD><EFBFBD><EFBFBD>ı<EFBFBD>

            // <20><><EFBFBD><EFBFBD>ͼ<EFBFBD><CDBC>λ<EFBFBD><CEBB>
            targetIcon.position = screenPoint;

            // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ļ<EFBFBD>ھ<EFBFBD><DABE><EFBFBD><EFBFBD>ı<EFBFBD>
            float distance = Vector3.Distance(mainCamera.transform.position, target.position);
            distanceText.text = $"{distance:F1}m";
        }
        else
        {
            // Ŀ<><C4BF><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ļ<EFBFBD>⣬<EFBFBD><E2A3AC>ʾ<EFBFBD><CABE>ͷ
            targetIcon.gameObject.SetActive(false);
            arrowIcon.gameObject.SetActive(true); // <20><>ʾ<EFBFBD><CABE>ͷ
            arrowDistanceText.gameObject.SetActive(true); // <20><>ʾ<EFBFBD><CABE>ͷ<EFBFBD><CDB7><EFBFBD><EFBFBD><EFBFBD>ı<EFBFBD>

            // <20><><EFBFBD><EFBFBD>Ŀ<EFBFBD><C4BF><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Һ󷽣<D2BA><F3B7BDA3><EFBFBD>ת<EFBFBD><D7AA><EFBFBD><EFBFBD>
            if (screenPoint.z < 0)
            {
                screenPoint.x = Screen.width - screenPoint.x; // ˮƽ<CBAE><C6BD>ת
                screenPoint.y = Screen.height - screenPoint.y; // <20><>ֱ<EFBFBD><D6B1>ת
            }

            // <20><><EFBFBD><EFBFBD>Ŀ<EFBFBD><C4BF><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ļ<EFBFBD><C4BB><EFBFBD>ĵķ<C4B5><C4B7><EFBFBD>
            Vector3 direction = (screenPoint - new Vector3(Screen.width / 2, Screen.height / 2, 0)).normalized;

            // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͷ<EFBFBD><CDB7><EFBFBD><EFBFBD>Ļ<EFBFBD>߽<EFBFBD><DFBD><EFBFBD>λ<EFBFBD><CEBB>
            Vector3 edgePosition = GetScreenEdgePosition(direction);

            // <20><><EFBFBD>ü<EFBFBD>ͷλ<CDB7><CEBB>
            arrowIcon.position = edgePosition;

            // <20><><EFBFBD>þ<EFBFBD><C3BE><EFBFBD><EFBFBD>ı<EFBFBD>λ<EFBFBD>ã<EFBFBD><C3A3>ڼ<EFBFBD>ͷ<EFBFBD>·<EFBFBD><C2B7><EFBFBD><EFBFBD><EFBFBD><EFBFBD>棩
            Vector3 textPosition = edgePosition + (Vector3)textOffset;
            textPosition = ClampToScreenBounds(textPosition); // <20><><EFBFBD><EFBFBD><EFBFBD>ı<EFBFBD><C4B1><EFBFBD><EFBFBD><EFBFBD>Ļ<EFBFBD><C4BB>Χ<EFBFBD><CEA7>
            arrowDistanceText.transform.position = textPosition;

            // <20><><EFBFBD>־<EFBFBD><D6BE><EFBFBD><EFBFBD>ı<EFBFBD>ˮƽ<CBAE><C6BD>ʾ
            arrowDistanceText.transform.rotation = Quaternion.identity;

            // <20><><EFBFBD>¾<EFBFBD><C2BE><EFBFBD><EFBFBD>ı<EFBFBD><C4B1><EFBFBD><EFBFBD><EFBFBD>
            float distance = Vector3.Distance(mainCamera.transform.position, target.position);
            arrowDistanceText.text = $"{distance:F1}m";

            // <20><>ת<EFBFBD><D7AA>ͷʹ<CDB7><CAB9>ָ<EFBFBD><D6B8>Ŀ<EFBFBD>귽<EFBFBD><EAB7BD>
            float angle = Mathf.Atan2(direction.y, direction.x) * Mathf.Rad2Deg;
            arrowIcon.rotation = Quaternion.Euler(0, 0, angle);
        }
    }

    // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ͷ<EFBFBD><CDB7><EFBFBD><EFBFBD>Ļ<EFBFBD>߽<EFBFBD><DFBD><EFBFBD>λ<EFBFBD><CEBB>
    private Vector3 GetScreenEdgePosition(Vector3 direction)
    {
        // <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ļ<EFBFBD><C4BB><EFBFBD><EFBFBD>
        float halfScreenWidth = Screen.width / 2 - edgePadding;
        float halfScreenHeight = Screen.height / 2 - edgePadding;

        // <20>жϼ<D0B6>ͷ<EFBFBD>Ƿ<EFBFBD>Ӧ<EFBFBD><D3A6><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ļ<EFBFBD><C4BB><EFBFBD><EFBFBD><EFBFBD>±<EFBFBD>Ե
        float slope = direction.y / direction.x;
        if (Mathf.Abs(slope) > halfScreenHeight / halfScreenWidth)
        {
            // <20><><EFBFBD><EFBFBD><EFBFBD>±<EFBFBD>Ե
            float edgeY = Mathf.Sign(direction.y) * halfScreenHeight + Screen.height / 2;
            float edgeX = (edgeY - Screen.height / 2) / slope + Screen.width / 2;
            return new Vector3(edgeX, edgeY, 0);
        }
        else
        {
            // <20><><EFBFBD><EFBFBD><EFBFBD>ұ<EFBFBD>Ե
            float edgeX = Mathf.Sign(direction.x) * halfScreenWidth + Screen.width / 2;
            float edgeY = slope * (edgeX - Screen.width / 2) + Screen.height / 2;
            return new Vector3(edgeX, edgeY, 0);
        }
    }

    // <20><><EFBFBD><EFBFBD><EFBFBD>ı<EFBFBD><C4B1><EFBFBD><EFBFBD><EFBFBD>Ļ<EFBFBD><C4BB>Χ<EFBFBD><CEA7>
    private Vector3 ClampToScreenBounds(Vector3 position)
    {
        position.x = Mathf.Clamp(position.x, edgePadding, Screen.width - edgePadding);
        position.y = Mathf.Clamp(position.y, edgePadding, Screen.height - edgePadding);
        return position;
    }
}