DOTSSample/Assets/Scripts/Game/Character/UI/HUDGoal.cs

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

public class HUDGoal : MonoBehaviour
{
    public GameObject goalIndicator;
    public RawImage goalArrow;
    public RawImage goalCenter;
    public Image goalProgress;

    private void Awake()
    {
        goalIndicator.SetActive(false);
    }

    public void FrameUpdate(ref Player.State playerState)
    {
        if (!playerState.displayGoal)
        {
            goalIndicator.SetActive(false);
            return;
        }
        goalIndicator.SetActive(true);
        Vector3 goalPosition = playerState.goalPosition;

        var c = GameApp.CameraStack.TopCamera();
        var sp = c.WorldToScreenPoint(goalPosition);
        sp.z = 0;
        sp.x = sp.x / Screen.width - 0.5f;
        sp.y = sp.y / Screen.height - 0.5f;

        float sp_mag = sp.magnitude;
        if (sp_mag > 1.0f)
            sp /= sp_mag;

        float dot = Vector3.Dot(c.transform.forward, (goalPosition - c.transform.position).normalized);
        if (dot < 0.25f)
        {
            float blend = Mathf.Clamp01(dot * 4.0f);
            float lr = Vector3.Dot(c.transform.right, (goalPosition - c.transform.position).normalized);
            Vector3 behind_sp = new Vector3(lr * 0.5f, -0.5f, 0);
            sp = Vector3.Lerp(behind_sp, sp, blend);
        }

        float arrowDirection = 180.0f;

        var inner = sp;
        inner.x = Mathf.Clamp(sp.x, -0.3f, 0.3f);
        inner.y = Mathf.Clamp(sp.y, -0.2f, 0.3f);

        if (dot < 0.0f || (sp - inner).magnitude > 0.15f)
        {
            // If outside center area of screen, show arrow pointing in direction of goal
            var d = sp.normalized;
            arrowDirection = Mathf.Atan2(-d.x, d.y) * 180.0f / Mathf.PI;
            sp = inner + (sp - inner).normalized * 0.15f;
            goalArrow.enabled = true;
            goalCenter.enabled = false;
        }
        else
        {
            goalCenter.enabled = true;
            goalArrow.enabled = false;
        }

        sp.x = (sp.x + 0.5f) * Screen.width;
        sp.y = (sp.y + 0.5f) * Screen.height;

        goalIndicator.transform.position = sp;
        var la = goalArrow.transform.localEulerAngles;
        la.z = arrowDirection;
        goalArrow.transform.localEulerAngles = la;
        goalArrow.SetRGB(Game.game.gameColors[(int)playerState.goalDefendersColor]);
        goalCenter.SetRGB(Game.game.gameColors[(int)playerState.goalDefendersColor]);
        goalProgress.fillAmount = playerState.goalCompletion;
    }
}