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Assets/Scripts/System/RandomPool/LevelRandom.cs

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+using System;
+using System.Collections.Generic;
+using System.RandomPool;
+using FJson;
+using Framework.Save;
+// using Framework.Save;
+using Game.Data;
+using UnityEngine;
+
+namespace Game
+{
+    /// <summary>
+    /// 稀有度随机
+    /// </summary>
+    public class LevelRandom
+    {
+        private LiteDictionary<int, int> _levelDic;
+        private Dictionary<int, int>     _weightDic;
+        private int                      _weightSum;
+
+        public LevelRandom (Dictionary<int, int> levelDic, IList<int> commonRandomGroups)
+        {
+            this._weightDic = new Dictionary<int, int>();
+            this._levelDic  = new LiteDictionary<int, int>();
+            
+            foreach (var randomGroup in commonRandomGroups)
+            {
+                if (levelDic.TryGetValue (randomGroup , out var value))
+                {
+                    this._levelDic[randomGroup] = value;
+                }
+            }
+            
+            this.RefreshWeight();
+        }
+
+        /// <summary>
+        /// 刷新总权重
+        /// </summary>
+        private void RefreshWeight()
+        {
+            this._weightDic.Clear();
+            this._weightSum = 0;
+            foreach (var dicKey in this._levelDic.Keys)
+            {
+                this._weightSum         += this._levelDic[dicKey];
+                this._weightDic[dicKey] =  this._weightSum;
+            }
+        }
+        
+        
+        /// <summary>
+        ///  设置指定等级的中奖比重
+        /// </summary>
+        /// <param name="quality"></param>
+        /// <param name="weight"></param>
+        public void SetWeight(int quality, int weight)
+        {
+            this._levelDic[quality] = weight;
+            this.RefreshWeight();
+        }
+
+        public int RandomItemLevel(int seedId)
+        {
+            var d     = RandomUtils.RandomFloat ();
+            var level = 0;
+            foreach (var dicKey in this._weightDic.Keys)
+            {
+                var value = this._weightDic[dicKey];
+                if (d <= value * 1f / this._weightSum)
+                {
+                    level = dicKey;
+                    break;
+                }
+            }
+            return level;
+        }
+
+        public int RandomItemLevel(int seedId , List<int> maskLevel)
+        {
+            var level = 0;
+            if (maskLevel == null || maskLevel.Count == 0)
+                return this.RandomItemLevel(seedId);
+            Dictionary<int, int> tempWeightList = new Dictionary<int, int>();
+            int                          tempWeightSum  = 0;
+            foreach (var itemLevel in this._levelDic.Keys)
+            {
+                if (maskLevel.Contains(itemLevel))
+                    continue;
+                tempWeightSum += this._levelDic[itemLevel];
+                tempWeightList[itemLevel] = tempWeightSum;
+            }
+
+            if (tempWeightSum != 0)
+            {
+                var d = RandomUtils.RandomFloat () * tempWeightSum;
+                foreach (var dicKey in tempWeightList.Keys)
+                {
+                    var value = tempWeightList[dicKey];
+                    if (d <= value)
+                    {
+                        level = dicKey;
+                        break;
+                    }
+                }
+            }
+            return level;
+        }
+        
+    }
+}