CheckScreenEdges

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

public class CheckScreenEdges : MonoBehaviour
{
    public enum ScreenEdge
    {
        None,
        Up,
        Down,
        Right,
        Left,
        UpRight,
        UpLeft,
        DownRight,
        DownLeft
    }

    [SerializeField] private CameraFreeFly cameraFreeFly;
    private ScreenEdge edge;

    private void LateUpdate()
    {
        CheckCursorPosition();

        Vector3 direction = Vector3.zero;
        switch (edge)
        {
            case ScreenEdge.None:
                break;
            case ScreenEdge.Up:
                direction = Vector3.forward;
                break;
            case ScreenEdge.Down:
                direction = Vector3.back;
                break;
            case ScreenEdge.Right:
                direction = Vector3.right;
                break;
            case ScreenEdge.Left:
                direction = Vector3.left;
                break;
            case ScreenEdge.UpRight:
                direction = Vector3.forward + Vector3.right;
                break;
            case ScreenEdge.UpLeft:
                direction = Vector3.forward + Vector3.left;
                break;
            case ScreenEdge.DownRight:
                direction = Vector3.back + Vector3.right;
                break;
            case ScreenEdge.DownLeft:
                direction = Vector3.back + Vector3.left;
                break;
            default:
                break;
        }

        cameraFreeFly.moveDirection = direction;
    }

    private void CheckCursorPosition()
    {
        float offset = 30;
        edge = ScreenEdge.None;

        if (Input.mousePosition.x < offset)//У левого края
        {
            edge = ScreenEdge.Left;

            if (Input.mousePosition.y < offset)//У верхнего края
            {
                edge = ScreenEdge.DownLeft;
                return;
            }

            if (Input.mousePosition.y > Screen.height - offset)//У нижнего края
            {
                edge = ScreenEdge.UpLeft;
                return;
            }

            return;
        }

        if (Input.mousePosition.x > Screen.width - offset)//У правого края
        {
            edge = ScreenEdge.Right;

            if (Input.mousePosition.y < offset)//У нижнего края
            {
                edge = ScreenEdge.DownRight;
                return;
            }

            if (Input.mousePosition.y > Screen.height - offset)//У верхнего края
            {
                edge = ScreenEdge.UpRight;
                return;
            }

            return;
        }

        if (Input.mousePosition.y > Screen.height - offset)//У верхнего края
        {
            edge = ScreenEdge.Up;
            return;
        }

        if (Input.mousePosition.y < offset)//У нижнего края
        {
            edge = ScreenEdge.Down;
            return;
        }
    }
}