BloodAndGore/Assets/Scripts/Enemies/EnemySpawner.cs

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

namespace Saltosion.OneWeapon.Enemies {
    public class EnemySpawner : MonoBehaviour {
        public GameObject[] EnemyPrefabs;
        public float SpawnCooldown = 5.0f;
        public float SpawnChance = 0.5f;
        public int MaxEnemiesWhenSpawning = 5;
        public float Radius = 4;

        private float SpawnTime = 0.0f;

        private void Update() {
            if (SpawnTime > 0) {
                SpawnTime -= Time.deltaTime;
            } else {
                GameObject[] Enemies = GameObject.FindGameObjectsWithTag("Enemy");
                if (Enemies.Length < 5 && Random.value < SpawnChance) {
                    float DirectionRadians = Random.value * Mathf.PI * 2.0f;
                    Vector2 Direction = new Vector2(Mathf.Cos(DirectionRadians), Mathf.Sin(DirectionRadians));
                    float Distance = Random.value * Radius;
                    Instantiate(EnemyPrefabs[(int)(Mathf.Min(0.99f, Random.value) * EnemyPrefabs.Length)], (Vector2)transform.position + Direction * Distance, new Quaternion(), null);
                }
                SpawnTime = SpawnCooldown;
            }
        }

        private void OnDrawGizmosSelected() {
            Gizmos.color = Color.green;
            Gizmos.DrawWireSphere(transform.position, Radius);
        }
    }
}