Develop-19050-Frozen2/04-IceSlide/Unity-19050-04-IceSlide/19050-04-IceSlide/Assets/Script/ParticlePool.cs

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

public class ParticlePool : MonoBehaviour
{

    [AutoUI][Range(0,5)] public int GroupCount;
    [AutoUI][Range(0, 10)] public int ParticleAmount = 1;
    public List<ParticleSystem> ParticleGroups = new List<ParticleSystem>();

    private const int total = 5;

    private void Start()
    {
        for(int i = 0;i<transform.childCount;i++)
        {
            var particle = transform.GetChild(i).GetComponent<ParticleSystem>();
            Put(particle);
        }
    }

    public bool Take(out ParticleSystem paritcle)
    {
        var count = transform.childCount - GroupCount;
        if (ParticleGroups.Count > count)
        {
            paritcle = ParticleGroups[Random.Range(0, ParticleGroups.Count)];
            OpenParticle(paritcle);
            return true;
        }
        paritcle = null;
        return false;
    }

    public void Put(ParticleSystem paritcle)
    {
        paritcle.transform.parent = transform;
        ParticleGroups.Add(paritcle);
        CloseParticle(paritcle);
    }

    public void CloseParticle(ParticleSystem paritcle)
    {
        var emission = paritcle.emission;
        emission.rateOverDistance = 0;
    }

    public void OpenParticle(ParticleSystem paritcle)
    {
        var emission = paritcle.emission;
        emission.rateOverDistance = ParticleAmount;
    }

}