VisibilityControlPoint.cs

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using System;
using System.Threading;
using TMPro;
using UnityEngine;
using UnityEngine.UI;
 
namespace Scripts.UI.UIPositioningSystem
{
    public class VisibilityControlPoint : MonoBehaviour
    {
        private Camera _camera;
        private Transform _cameraTransform;
 
        private const string UI_LAYER_NAME = "UI";
 
        public void Start()
        {
            _camera = CameraSource.Camera;
            _cameraTransform = CameraSource.Camera.transform;
        }
 
        public void Update()
        {
            var movableUIElement = PingInCameraView();
            
            if (movableUIElement != null)
            {
                movableUIElement.ProcessIntersection();
            }
        }
        
        private IMovableUIElement PingInCameraView()
        {
            Vector3 viewport = _camera.WorldToViewportPoint(transform.position);
            bool inCameraFrustum = IsInRange01(viewport.x) && IsInRange01(viewport.y);
            bool inFrontOfCamera = viewport.z > 0;
 
            if (inCameraFrustum && inFrontOfCamera)
            {
                RaycastHit hitInfo;
                bool objectBlockingPoint = false;
 
                Vector3 directionBetween = transform.position - _cameraTransform.position;
                directionBetween = directionBetween.normalized;
 
                float distance = Vector3.Distance(_cameraTransform.position, transform.position);
 
                var layer_mask = LayerMask.GetMask(UI_LAYER_NAME);
                
                if(Physics.Raycast(_cameraTransform.position, directionBetween, out hitInfo, distance + 0.05f, layer_mask)) {
                    if(hitInfo.point != transform.position) {
                        return hitInfo.collider.GetComponent<IMovableUIElement>();
                    }
                }
            }
 
            return null;
        }
        
        private bool IsInRange01(float a) {
            return a > 0 && a < 1;
        }
    }
}