ProbabDistrib.h

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// ProbabDistrib.h
 
// Declares the cProbabDistrib class representing a discrete probability distribution curve and random generator
 
/*
Usage:
1, Create a cProbabDistrib instance
2, Initialize the distribution either programmatically, using the SetPoints() function, or using a definition string
3, Ask for random numbers in that probability distribution using the Random() function
*/
 
 
 
 
 
#pragma once
 
 
 
 
 
#include "FastRandom.h"
 
 
 
 
 
class cProbabDistrib
{
public:
    class cPoint
    {
    public:
        int m_Value;
        int m_Probability;
 
        cPoint(int a_Value, int a_Probability) :
            m_Value(a_Value),
            m_Probability(a_Probability)
        {
        }
    } ;
 
    typedef std::vector<cPoint> cPoints;
 
 
    cProbabDistrib(int a_MaxValue);
 
    void SetPoints(const cPoints & a_Points);
 
    bool SetDefString(const AString & a_DefString);
 
    int Random(MTRand & a_Rand) const;
 
    int MapValue(int a_OrigValue) const;
 
    int GetSum(void) const { return m_Sum; }
 
protected:
 
    int m_MaxValue;
 
    cPoints m_Cumulative;
 
    int m_Sum;
} ;