init

2026-07-09 21:33:33 +02:00
commit 84a2a365f3
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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using UnityEngine;
+using Random = UnityEngine.Random;
+
+namespace VOID.Generic.Util
+{
+    public static class RandomUtil
+    {
+        /// <summary>
+        /// Reinit random with given seed.
+        /// </summary>
+        public static void InitState(int seed)
+        {
+            Random.InitState(seed);
+        }
+        
+        /// <summary>
+        /// Returns random integer between min and max.
+        /// </summary>
+        public static int RandomInteger(int min = 0, int max = 100)
+        {
+            return Mathf.RoundToInt(Random.value * (max-min)) + min;
+        }
+        
+        /// <summary>
+        /// Returns random float between min and max.
+        /// </summary>
+        public static float RandomFloat(float min = 0, float max = 1)
+        {
+            return Random.value * (max-min) + min;
+        }
+
+        /// <summary>
+        /// Returns random element from given collection.
+        /// </summary>
+        public static T RandomElement<T>(IEnumerable<T> enumerable)
+        {
+            return RandomElements(enumerable, 1)[0];
+        }
+
+        /// <summary>
+        /// Returns random element from given collection.
+        /// </summary>
+        public static List<T> RandomElements<T>(IEnumerable<T> enumerable, int count, bool repeatable = false)
+        {
+            var list = enumerable.ToList();
+            
+            // Not repeatable - we can take each value only once - sort by random and get needed amount
+            if (!repeatable) return list.OrderBy(_ => RandomFloat()).Take(count).ToList();
+            
+            // Repeatable - randomize each time and get value from list
+            return new T[count].Select(_ => list[RandomInteger(0, list.Count - 1)]).ToList();
+        }
+
+        /// <summary>
+        /// Returns random element from given collection by function that determine weight.
+        /// </summary>
+        public static T RandomElementByWeight<T>(IEnumerable<T> enumerable, Func<T, float> getWeight)
+        {
+            var list = enumerable.ToList();
+            var maxWeight = list.Sum(getWeight.Invoke);
+            var randomWeight = RandomFloat(0, maxWeight);
+            return list.FirstOrDefault(element => (randomWeight -= getWeight.Invoke(element)) <= 0f);
+        }
+    }
+}