EnemyController

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

public class EnemyController : MonoBehaviour
{
    public Sprite[] sprites;
    public int direction = 0; // 0 - вверх, 1 - вниз, 2 - влево, 3 - вправо.
    public float speed = 0.05f;
    private SpriteRenderer render;
    private Vector2 step;
    private Rect bgRect;
    public GameObject bullet;
    public float shotTimer = 3f;
    public float shotSpeed = 3f;
    public float moveTimer = 0;
    public float maxMoveTimer = 1f;
    private System.Random rnd;
    public int rndSeed = 0;
    void Start()
    {
        rnd = new System.Random(rndSeed);
        render = GetComponent<SpriteRenderer>();
        step = new Vector2();
        GameObject bg = GameObject.FindGameObjectWithTag("Background");
        Vector2 bg_pos = bg.transform.position;
        Sprite bg_sprite = bg.GetComponent<SpriteRenderer>().sprite;
        Camera cam = Camera.main;
        Vector2 point1 = cam.ScreenToWorldPoint(bg_pos);
        float w = -point1.x * 2;
        float h = -point1.y * 2;
        //point1.x = -point1.x;
        bgRect = new Rect(point1.x, point1.y, w, h);

    }
    void Update()
    {

        transform.rotation = Quaternion.identity;

        if (direction == 0)
        {
            step = new Vector2(0, speed);
        }
        if (direction == 1)
        {
            step = new Vector2(0, -speed);
        }
        if (direction == 2)
        {
            step = new Vector2(-speed, 0);
        }
        if (direction == 3)
        {
            step = new Vector2(speed, 0);
        }

        render.sprite = sprites[direction];
        Vector2 pos = gameObject.transform.position;
        pos += step;
        if (CheckMove(pos))
        {
            gameObject.transform.position = pos;
        }
        else
        {
            step = new Vector2();
        }
    }
    bool CheckMove(Vector2 newPosition)
    {
        return bgRect.Contains(newPosition);
    }
    private void OnCollisionEnter2D(Collision2D collision)
    {
        //Debug.Log(collision);
        if (collision.gameObject.tag == "Wall")
        {
            step = new Vector2();
        }
    }
}