81 lines
2.2 KiB
C#
81 lines
2.2 KiB
C#
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using UnityEngine;
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using UnityEngine.UI;
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using System.Collections;
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using System;
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using System.Collections.Generic;
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namespace MoreMountains.Tools
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{
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/// <summary>
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/// A class to use to get more controlled randomness, taking values out of the bag randomly, and never getting them again.
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///
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/// Usage :
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///
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/// var shuffleBag = new ShuffleBag(40);
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/// for (int i = 0; i<40; i++)
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/// {
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/// newValue = something;
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/// shuffleBag.Add(newValue, amount);
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/// }
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///
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/// then :
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/// float something = shuffleBag.Pick();
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///
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/// </summary>
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public class MMShufflebag<T>
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{
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public int Capacity { get { return _contents.Capacity; } }
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public int Size { get { return _contents.Count; } }
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protected List<T> _contents;
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protected T _currentItem;
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protected int _currentIndex = -1;
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/// <summary>
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/// Initializes the shufflebag
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/// </summary>
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/// <param name="initialCapacity"></param>
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public MMShufflebag(int initialCapacity)
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{
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_contents = new List<T>(initialCapacity);
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}
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/// <summary>
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/// Adds the specified quantity of the item to the bag
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/// </summary>
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/// <param name="item"></param>
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/// <param name="quantity"></param>
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public void Add(T item, int quantity)
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{
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for (int i = 0; i < quantity; i++)
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{
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_contents.Add(item);
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}
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_currentIndex = Size - 1;
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}
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/// <summary>
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/// Returns a random item from the bag
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/// </summary>
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/// <returns></returns>
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public T Pick()
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{
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if (_currentIndex < 1)
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{
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_currentIndex = Size - 1;
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_currentItem = _contents[0];
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return _currentItem;
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}
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int position = UnityEngine.Random.Range(0, _currentIndex);
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_currentItem = _contents[position];
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_contents[position] = _contents[_currentIndex];
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_contents[_currentIndex] = _currentItem;
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_currentIndex--;
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return _currentItem;
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}
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}
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}
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