smart-bow-infrared/Assets/WildAttack/Scripts/Utils/WeightRandomUtils.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
namespace WildAttack
{
    /// <summary>
    /// 根据权重随机
    /// </summary>
    public class WeightRandomUtils : Singleton<WeightRandomUtils>
    {
        public int GetRandomId(List<int> weightList)
        {
            int rdm = Random.Range(0, GetTotalWeight(weightList) + 1);
            int limit = 0;
            for (int i = 0; i < weightList.Count; i++)
            {
                limit += weightList[i];
                if (rdm <= limit)
                {
                    return i + 1;
                }
            }

            return -1;
        }

        private int GetTotalWeight(List<int> weightList)
        {
            int total = 0;
            foreach (var item in weightList)
            {
                total += item;
            }

            return total;
        }
    }
}