Subversion Repositories public iLand

#ifndef RANDOM_H
#define RANDOM_H

#include <QtCore/QString>
class Random
{
public:
    Random();
};

// RandomIndex: get indicies in a random order
class RandomIndex
{
public:
        RandomIndex(int aCount); ///< creates a index with aCount entries.
        ~RandomIndex();
        bool next(); ///< retrieve next index. return false if all indices used.
        int index() const { return mIndex; } ///< retrieve (random) index
private:
        int mCount;
        int mIndex; // aktuell ausgewählter Index.
        char *mField;
        int  mRemaining;
};

class RandomWeighted
{
public:
        RandomWeighted();
        ~RandomWeighted();
        void setup(const int gridSize);
        void setWeight(const int index, const int value);
        int get();
        double getRelWeight(const int index);
        double getRelWeight(const int from, const int to);
private:
        int *mGrid;
        int mSize;
        int mMemorySize;
        int mMaxVal;
        bool mUpdated;
        void updateValues();

};
class Expression;
class RandomCustomPDF
{

public:
        RandomCustomPDF();
        RandomCustomPDF(const QString &densityFunction){ mExpression=0; setup(densityFunction);}
        ~RandomCustomPDF();
        void setup(const QString &funcExpr, const double lowerBound=0., const double upperBound=1., const bool isSumFunc=false, const int stepCount=100);
        // operation
        double get(); ///< get a random number
        double getProbOfRange(const double lowerBound, const double upperBound); ///< get probability of random numbers between given bounds.
private:
        RandomWeighted mRandomIndex;
        Expression *mExpression;
        int mSteps;
        double mLowerBound, mUpperBound;
        double mDeltaX;
        bool mSumFunction;
};


#endif // RANDOM_H