Camera

using UnityEngine;
using System.Collections;

public class CameraBehaviour : MonoBehaviour
{
    public Vector2 TopLeftLimit = new Vector2(-50f, 50f);
    public Vector2 BottomRightLimit = new Vector2(50f, -50f);
    public Vector2 CameraZoomLimit = new Vector2(5f, 10f);
    // public Vector2 DepthLimit = new Vector2(-5f, -10f);

    public float Speed = 5f;

    private float sensitivity = 2.0f;
    private float cameraZoom = 0;
    private ModeSwitch _modeSwitch;
    private GameObject _player;
    private Transform _playerTransform;

    private Vector3 _resetCamera;
    private bool _drag = false;


    void Start()
    {
        _modeSwitch = GameObject.Find("ModeManager").GetComponent<ModeSwitch>();
        _resetCamera = Camera.main.transform.position;
        cameraZoom = Camera.main.transform.position.z;
        _player = GameObject.Find("Character");
        _playerTransform = _player.transform;
    }

    void Update()
    {
        if (_modeSwitch._mode == GameMode.Editor)
        {
            if (Input.GetMouseButtonDown(1))
                Camera.main.transform.position = _resetCamera;

            if (Input.GetKey(KeyCode.Space) && Input.GetMouseButtonDown(0))
                _drag = true;

            if (Input.GetMouseButtonUp(0))
                _drag = false;

            if (_drag)
            {
                float x = -Input.GetAxis("Mouse X");
                float y = -Input.GetAxis("Mouse Y");
                transform.Translate(x, y, 0);
            }

            if (Input.GetAxis("Mouse ScrollWheel") != 0)
            {
                cameraZoom -= Input.GetAxis("Mouse ScrollWheel") * sensitivity;
                cameraZoom = Mathf.Clamp(cameraZoom, CameraZoomLimit.x, CameraZoomLimit.y);
            }
            //Clamp
            float x2 = Mathf.Clamp(transform.position.x, TopLeftLimit.x, BottomRightLimit.x);
            float y2 = Mathf.Clamp(transform.position.y, BottomRightLimit.y, TopLeftLimit.y);
            transform.position = new Vector3(x2, y2, cameraZoom);
        }

        else
        {
            Vector3 targetPos = new Vector3(_playerTransform.position.x, _playerTransform.position.y, cameraZoom);
            transform.position = Vector3.Lerp(transform.position, targetPos, Time.deltaTime * Speed);

            this.transform.position = new Vector3(_player.transform.position.x, _player.transform.position.y, transform.position.z);
        }
    }
}