Terraria 1.4.0.5 Source Code

Utilities/WeightedRandom`1.cs

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+// Decompiled with JetBrains decompiler
+// Type: Terraria.Utilities.WeightedRandom`1
+// Assembly: Terraria, Version=1.4.0.5, Culture=neutral, PublicKeyToken=null
+// MVID: 67F9E73E-0A81-4937-A22C-5515CD405A83
+// Assembly location: C:\Users\mikeyisbaeyt\Downloads\depotdownloader-2.4.5\depots\105601\6707058\Terraria.exe
+
+using System;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Terraria.Utilities
+{
+  public class WeightedRandom<T>
+  {
+    public readonly List<Tuple<T, double>> elements = new List<Tuple<T, double>>();
+    public readonly UnifiedRandom random;
+    public bool needsRefresh = true;
+    private double _totalWeight;
+
+    public WeightedRandom() => this.random = new UnifiedRandom();
+
+    public WeightedRandom(int seed) => this.random = new UnifiedRandom(seed);
+
+    public WeightedRandom(UnifiedRandom random) => this.random = random;
+
+    public WeightedRandom(params Tuple<T, double>[] theElements)
+    {
+      this.random = new UnifiedRandom();
+      this.elements = ((IEnumerable<Tuple<T, double>>) theElements).ToList<Tuple<T, double>>();
+    }
+
+    public WeightedRandom(int seed, params Tuple<T, double>[] theElements)
+    {
+      this.random = new UnifiedRandom(seed);
+      this.elements = ((IEnumerable<Tuple<T, double>>) theElements).ToList<Tuple<T, double>>();
+    }
+
+    public WeightedRandom(UnifiedRandom random, params Tuple<T, double>[] theElements)
+    {
+      this.random = random;
+      this.elements = ((IEnumerable<Tuple<T, double>>) theElements).ToList<Tuple<T, double>>();
+    }
+
+    public void Add(T element, double weight = 1.0)
+    {
+      this.elements.Add(new Tuple<T, double>(element, weight));
+      this.needsRefresh = true;
+    }
+
+    public T Get()
+    {
+      if (this.needsRefresh)
+        this.CalculateTotalWeight();
+      double num = this.random.NextDouble() * this._totalWeight;
+      foreach (Tuple<T, double> element in this.elements)
+      {
+        if (num <= element.Item2)
+          return element.Item1;
+        num -= element.Item2;
+      }
+      return default (T);
+    }
+
+    public void CalculateTotalWeight()
+    {
+      this._totalWeight = 0.0;
+      foreach (Tuple<T, double> element in this.elements)
+        this._totalWeight += element.Item2;
+      this.needsRefresh = false;
+    }
+
+    public void Clear() => this.elements.Clear();
+
+    public static implicit operator T(WeightedRandom<T> weightedRandom) => weightedRandom.Get();
+  }
+}