ICTS_2021/Unity3/Assets/UI/Loader/LoadingBackgroundSpermsManager.cs

using UnityEngine;
using System.Collections;

/// <summary>
/// This component is responsible for spawning the loading background sperms.
/// They are spawned according to the <code>spawnRatePerSecond</code>.
/// To add an element of randomness we also have <code>timeVariancePercentage</code>
/// which slightly randomizes the <code>_averageTimePerSpawn</code>.
/// The sperms are spawned betwee <code>minY</code> and <code>maxY</code>
/// </summary>
public class LoadingBackgroundSpermsManager : MonoBehaviour
{
	public PoolObject backgroundSpermPrefab;
	public Transform anchor;

	public float spawnRatePerSecond = 1.5f;
	public float timeVariancePercentage = 0.15f;
	public float minY, maxY; //should be between -0.5 and 0.5f;
	public const float MIN_SCALE = 0.15f, MAX_SCALE = 0.5f;

	float _averageTimePerSpawn;
	float _nextSpawnTime;
	Pool _pool;

	void Awake()
	{
		_averageTimePerSpawn = 1/spawnRatePerSecond;
		_pool = Pool.Create(backgroundSpermPrefab, 50);
		Spawn();
	}

	void Update()
	{
		if (Time.time >= _nextSpawnTime)
		{
			Spawn();
		}
	}

	void Spawn()
	{
		Transform sperm = _pool.Spawn().transform;
		sperm.parent = anchor;
		sperm.localScale = Vector3.one * Random.Range(MIN_SCALE, MAX_SCALE);
		sperm.localPosition = new Vector3(-400, Random.Range(minY * GameConstants.GAME_HEIGHT, maxY * GameConstants.GAME_HEIGHT));

		_nextSpawnTime = Time.time + _averageTimePerSpawn + Random.Range(-_averageTimePerSpawn*timeVariancePercentage, _averageTimePerSpawn*timeVariancePercentage);
	}
}