Unity 可调控概率

可调控近似概率

可调控稳定概率

using System.Collections.Generic;
using UnityEngine;

public class RandRate : MonoBehaviour
{
    void Start()
    {
        for (int i = 0; i < 100; i++)
        {
            //int value = GetRandomRate(new float[5] { 0.2f, 0.3f, 0.4f, 0.05f, 0.05f });
            int value = GetRateNoRandom();
            Debug.Log(value);
        }
    }

    // 约等于概率
    int GetRandomRate(float[] probs)
    {
        float total = 0;
        foreach (float elem in probs)
        {
            total += elem;
        }
        float randomPoint = Random.value * total;
        for (int i = 0; i < probs.Length; i++)
        {
            if (randomPoint < probs[i])
            {
                return i;
            }
            else
            {
                randomPoint -= probs[i];
            }
        }
        return probs.Length - 1;
    }

    // 数组值加起来不一定等于100,但是一般规范100 就行,要求整数
    int[] NoRandomArr;
    // 先初始化出来存储起来
    List RandomList ;

    void InitRandomListValue()
    {
        NoRandomArr = new int[5] {20, 30, 40, 5, 5 };
        RandomList = new List();
        for (int i = 0; i < NoRandomArr.Length; i++)
        {
            for (int j = 0; j < NoRandomArr[i]; j++)
            {
                RandomList.Add(i);
            }
        }
    }

    // 稳定概率 例如设置了0的概率是10 ,那么100次一定有10次,不多不少
    int GetRateNoRandom()
    {
        if (RandomList == null ||RandomList.Count == 0) InitRandomListValue();
        int listIndex = Random.Range(0, RandomList.Count - 1);
        int listValue = RandomList[listIndex];
        RandomList.RemoveAt(listIndex);
        return listValue;
    }
}