histogramdata.h

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#ifndef HISTOGRAMDATA
#define HISTOGRAMDATA

#include <map>
#include <vector>


class HistogramData {
private:
    unsigned count_; 

    typedef std::map<unsigned short, unsigned> data_type;
    typedef data_type::const_iterator citer_type;

    data_type data_; 

public:
    HistogramData() :
        count_(0)
    {
    }

    void AddData(unsigned short value)
    {
        // only consider positive values
        if (value) {
            ++count_;
            ++data_[value];
        }
    }

    std::vector<float> ResampleData(unsigned slice_count) const
    {
        std::vector<float> result(slice_count, 0.0f);
        std::vector<float> factor(slice_count, 1.0f);

        const float x = 65536.0f / slice_count;

        for (citer_type i = data_.begin(); i != data_.end(); ++i) {
            const int slice = static_cast<int> (i->first / x);
            const float f = 1.0f / factor[slice];
            result[slice] = (1.0f - f) * result[slice] + f * i->second;
            factor[slice] += 1.0f;
        }

        return result;
    }
};

#endif

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