src/Volume.h

#include <vector>

#include <algorithm>
#include <functional>

#include <iostream>

// Simple linear volume class which supports loading from DAT files
class Volume
{
public:

        class Voxel
        {
        public:

                Voxel()
                {
                        SetValue(0.0f);
                };

                Voxel(const Voxel & datOther)
                {
                        m_fValue = datOther.m_fValue;
                };

                Voxel(const float fValue)
                {
                        SetValue(fValue);
                };


                ~Voxel()
                {
                };

                void SetValue(const float fValue)
                {
                        m_fValue = fValue;
                };

                float GetValue() const
                {
                        return m_fValue;
                };

                bool operator==(const Voxel &datOther) const
                {
                        return (GetValue() == datOther.GetValue());
                };

                bool operator!=(const Voxel &datOther) const
                {
                        return !(*this == datOther);
                };

                bool operator>(const Voxel &datOther) const
                {
                        return GetValue() > datOther.GetValue();
                };

                bool operator>=(const Voxel &datOther) const
                {
                        return GetValue() >= datOther.GetValue();
                };

                bool operator<(const Voxel &datOther) const
                {
                        return GetValue() < datOther.GetValue();
                };

                bool operator<=(const Voxel &datOther) const
                {
                        return GetValue() <= datOther.GetValue();
                };

                const Voxel & operator+=(const Voxel & datOther)
                {
                        m_fValue += datOther.m_fValue;
                        return *this;
                };

                const Voxel & operator-=(const Voxel & datOther)
                {
                        m_fValue -= datOther.m_fValue;
                        return *this;
                };

                const Voxel & operator*=(const float & fOther)
                {
                        m_fValue *= fOther;
                        return *this;
                };

                const Voxel & operator/=(const float & fOther)
                {
                        m_fValue /= fOther;
                        return *this;
                };

                const Voxel operator+(const Voxel & datOther) const
                {
                        Voxel voxNew = *this;
                        voxNew += datOther;
                        return voxNew;
                };

                const Voxel operator-(const Voxel & datOther) const
                {
                        Voxel voxNew = *this;
                        voxNew -= datOther;
                        return voxNew;
                };

                const Voxel operator*(const float & fOther) const
                {
                        Voxel voxNew = *this;
                        voxNew *= fOther;
                        return voxNew;
                };

                const Voxel operator/(const float & fOther) const
                {
                        Voxel voxNew = *this;
                        voxNew /= fOther;
                        return voxNew;
                };

        private:
                float m_fValue;
        };

public:
        Volume() : m_iWidth(1), m_iHeight(1), m_iDepth(1), m_vecVoxels(1)
        {
        };

        Volume(const std::string &strFilename) : m_iWidth(1), m_iHeight(1), m_iDepth(1), m_vecVoxels(1)
        {
                load(strFilename);
        };

        ~Volume(void)
        {
        };

        const Voxel & Get(const int iX, const int iY, const int iZ) const
        {
                return m_vecVoxels[iX + iY*m_iWidth + iZ*m_iWidth*m_iHeight];
        };

        const Voxel & Get(const int iIndex) const
        {
                return m_vecVoxels[iIndex];
        };

        const Voxel * Get() const
        {
                return &(m_vecVoxels.front());
        };

        int GetWidth() const
        {
                return m_iWidth;
        };

        int GetHeight() const
        {
                return m_iHeight;
        };

        int GetDepth() const
        {
                return m_iDepth;
        };

        int GetSize() const
        {
                return int(m_vecVoxels.size());
        };
        
        
        void load(const std::string & strFilename)
        {
                std::cout << "- Loading file '" << strFilename << "' ... " << std::endl;
                FILE* fp = NULL;
                
                fp = fopen(strFilename.c_str(),"rb");
                if (!fp) {
                        std::cerr << "+ Error loading file." << std::endl << std::endl;
                } else {
                        unsigned short uWidth, uHeight, uDepth;
                        fread(&uWidth,sizeof(unsigned short),1,fp);
                        fread(&uHeight,sizeof(unsigned short),1,fp);
                        fread(&uDepth,sizeof(unsigned short),1,fp);

                        m_iWidth = int(uWidth);
                        m_iHeight = int(uHeight);
                        m_iDepth = int(uDepth);

                        std::cout << "Dataset size: " << m_iWidth << " x " << m_iHeight << " x " << m_iDepth << std::endl;

                        const int iSlice = m_iWidth * m_iHeight;
                        const int iSize = iSlice * m_iDepth;
                        m_vecVoxels.resize(iSize);

                        std::vector<unsigned short> vecData;
                        vecData.resize(iSize);

                        fread((void*)&(vecData.front()),sizeof(unsigned short),iSize,fp);
                        fclose(fp);

                        std::cout << "- File loaded." << std::endl;

                        for (int k=0;k<m_iDepth;k++) {
                                for (int j=0;j<m_iHeight;j++) {
                                        for (int i=0;i<m_iWidth;i++) {
                                                //we convert the data to float values in an interval of [0..1]
                                                const float fValue = min(1.0f,float(vecData[i + j*m_iWidth + k*iSlice]) / 4095.0f);
                                                m_vecVoxels[i+j*m_iWidth+k*iSlice] = Voxel(fValue);
                                        }
                                }

                                std::cout << "\r- Preparing data (" << (k*100) / (m_iDepth-1) << "%) ...";
                        }

                        std::cout << std::endl << "- Data prepared." << std::endl;
                }
        };

protected:

private:
        int m_iWidth,m_iHeight,m_iDepth;
        std::vector<Voxel> m_vecVoxels;
        
};