furfury/Furcherro/Assets/Scripts/RandomProb.cs

using UnityEngine;
using System.Collections.Generic;

//------------------------------------------------------------------
public class RandomProbInfo
{
    public string m_value = "";
	public float m_start = 0;
	public float m_end = 0;
	public float m_weight = 0;
}

//------------------------------------------------------------------
public class RandomProb
{
    List<RandomProbInfo> m_values = new List<RandomProbInfo>();
	float m_maximum = 0;

    //------------------------------------------------------------------
    public void AddValue(string value, float prob )
	{
        RandomProbInfo randomProbInfo = new RandomProbInfo();

        randomProbInfo.m_value = value;
        randomProbInfo.m_weight = prob;
        randomProbInfo.m_start = m_maximum;
        randomProbInfo.m_end = randomProbInfo.m_start + prob;

        m_maximum = randomProbInfo.m_end;
        m_values.Add(randomProbInfo);
    }

    //------------------------------------------------------------------
    public string GetRandomValue()
    {
        float random = Random.Range(0f, 1f) * m_maximum;
        string randomValue = "";

        for (int i = 0; i < m_values.Count; ++i )
				if (random >= m_values[i].m_start && random < m_values[i].m_end)
            return m_values[i].m_value;

        return randomValue;
    }
}