Repository/Assets/Compass.cs

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

public class Compass : MonoBehaviour
{
    public GameObject iconPrefab;
    List<TracingMarker> tracingMarkers = new List<TracingMarker>();

    public RawImage compassImage;
    public Transform player;

    float compassUnit;
    public TracingMarker[] ss;
    public float maxDistance = 200f;
    private void OnEnable()
    {
        compassUnit = compassImage.rectTransform.rect.width / 360f;
        AddTracingMarker(ss[0]);
        AddTracingMarker(ss[1]);
        AddTracingMarker(ss[2]);
        AddTracingMarker(ss[3]);
    }
    private void Update()
    {
        compassImage.uvRect = new Rect(player.localEulerAngles.y / 360, 0f, 1f, 1f);
        foreach (TracingMarker marker in tracingMarkers)
        {
            marker.image.rectTransform.anchoredPosition = GetPoseOnCompass(marker);

            float dst = Vector2.Distance(new Vector2(player.transform.position.x, player.transform.position.z), marker.position);
            float scale = 0f;
            if(dst < maxDistance)
            {
                scale = 1f - (dst / maxDistance);

                marker.image.rectTransform.localScale = Vector3.one * scale;
;            }
        }
    }

    public void AddTracingMarker (TracingMarker marker)
    {
        GameObject newMarker = Instantiate(iconPrefab, compassImage.transform);
        marker.image = newMarker.GetComponent<Image>();

          marker.image.sprite = marker.icon;

        tracingMarkers.Add(marker);
    }
    Vector2 GetPoseOnCompass (TracingMarker marker)
    {
        Vector2 cameraPos = new Vector2(player.transform.position.x, player.transform.position.z);
        Vector2 cameraPwd = new Vector2(player.transform.forward.x, player.transform.position.z);

        float angle = Vector2.SignedAngle(marker.position - cameraPos, cameraPwd);
        return new Vector2(compassUnit * angle, 0f);
    }
}